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38
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1 ///////////////////////////////////////////////////////////////////////////////
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2 /// -*- coding: UTF-8 -*-
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3 ///
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4 /// \file Discovery/Src/vpm.c
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5 /// \brief critical_volume comment by hw
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6 /// \author Heinrichs Weikamp, Erik C. Baker
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7 /// \date 19-April-2014
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8 ///
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9 /// \details
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10 ///
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11 /// $Id$
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12 ///////////////////////////////////////////////////////////////////////////////
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13 /// \par Copyright (c) 2014-2018 Heinrichs Weikamp gmbh
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14 ///
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15 /// This program is free software: you can redistribute it and/or modify
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16 /// it under the terms of the GNU General Public License as published by
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17 /// the Free Software Foundation, either version 3 of the License, or
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18 /// (at your option) any later version.
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19 ///
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20 /// This program is distributed in the hope that it will be useful,
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21 /// but WITHOUT ANY WARRANTY; without even the implied warranty of
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22 /// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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23 /// GNU General Public License for more details.
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24 ///
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25 /// You should have received a copy of the GNU General Public License
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26 /// along with this program. If not, see <http://www.gnu.org/licenses/>.
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27 //////////////////////////////////////////////////////////////////////////////
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28 /// \par Varying Permeability Model (VPM) Decompression Program in c (converted from FORTRAN)
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29 ///
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30 /// Author: Erik C. Baker
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31 ///
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32 /// "DISTRIBUTE FREELY - CREDIT THE AUTHORS"
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33 ///
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34 /// This program extends the 1986 VPM algorithm (Yount & Hoffman) to include
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35 /// mixed gas, repetitive, and altitude diving. Developments to the algorithm
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36 /// were made by David E. Yount, Eric B. Maiken, and Erik C. Baker over a
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37 /// period from 1999 to 2001. This work is dedicated in remembrance of
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38 /// Professor David E. Yount who passed away on April 27, 2000.
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39 ///
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40 /// Notes:
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41 /// 1. This program uses the sixteen (16) half-time compartments of the
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42 /// Buhlmann ZH-L16 model. The optional Compartment 1b is used here with
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43 /// half-times of 1.88 minutes for helium and 5.0 minutes for nitrogen.
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44 ///
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45 /// 2. This program uses various DEC, IBM, and Microsoft extensions which
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46 /// may not be supported by all FORTRAN compilers. Comments are made with
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47 /// a capital "C" in the first column or an exclamation point "!" placed
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48 /// in a line after code. An asterisk "*" in column 6 is a continuation
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49 /// of the previous line. All code, except for line numbers, starts in
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50 /// column 7.
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51 ///
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52 /// 3. Comments and suggestions for improvements are welcome. Please
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53 /// respond by e-mail to: EBaker@se.aeieng.com
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54 ///
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55 /// Acknowledgment: Thanks to Kurt Spaugh for recommendations on how to clean
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56 /// up the code.
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57 /// ===============================================================================
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58 /// Converted to vpmdeco.c using f2c; R.McGinnis (CABER Swe) 5/01
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59 /// ===============================================================================
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60 ///
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61 /// ************************ Heirichs Weipkamp **************************************
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62 ///
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63 /// The original Yount & Baker code has been adjusted for real life calculation.
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64 ///
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65 /// 1) The original main function has been split in several functions
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66 ///
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67 /// 2) When the deco zone is reached (while ascending) the gradient factors are kept fix
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68 /// and critical volume algorithm is switched of. maxfirststopdepth is kept fix
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69 /// to make shure Boeyls Law algorithm works correctly
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70 ///
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71 /// 4) gas_loadings_ascent_descend heeds all gaschanges and CCR support has been added
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72 ///
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73
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74 #include <stdio.h>
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75 #include <stdlib.h>
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76 #include <string.h>
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77 #include <math.h>
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78 #include <time.h>
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79
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80 #include "vpm.h"
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81 #include "decom.h"
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82
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83 #define GAS_N2 0
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84 #define GAS_HE 1
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85
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290
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86 static const _Bool buehlmannSafety = true;
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38
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87 /* Common Block Declarations */
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88
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89 extern const float SURFACE_TENSION_GAMMA; //!Adj. Range: 0.015 to 0.065 N/m
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90 extern const float SKIN_COMPRESSION_GAMMAC; //!Adj. Range: 0.160 to 0.290 N/m
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91 extern const float UNITS_FACTOR;
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92 extern const float WATER_VAPOR_PRESSURE; // (Schreiner value) based on respiratory quotien
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93 extern const float CRIT_VOLUME_PARAMETER_LAMBDA; //!Adj. Range: 6500 to 8300 fsw-min
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290
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94 //extern const float GRADIENT_ONSET_OF_IMPERM_ATM; //!Adj. Range: 5.0 to 10.0 atm
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38
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95 extern const float REGENERATION_TIME_CONSTANT; //!Adj. Range: 10080 to 51840 min
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290
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96 //extern const float PRESSURE_OTHER_GASES_MMHG; //!Constant value for PO2 up to 2 atm
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38
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97 extern const float CONSTANT_PRESSURE_OTHER_GASES; // PRESSURE_OTHER_GASES_MMHG / 760. * UNITS_FACTOR;
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98
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99 extern const float HELIUM_TIME_CONSTANT[];
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100 extern const float NITROGEN_TIME_CONSTANT[];
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101
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290
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102 static float minimum_deco_stop_time;
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103 static float run_time, run_time_first_stop;
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104 static float segment_time;
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105 static short mix_number;
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106 static float barometric_pressure;
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107 static _Bool altitude_dive_algorithm_off;
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108 static _Bool units_equal_fsw, units_equal_msw;
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38
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109
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110 /* by hw 11.06.2015 to allow */
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290
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111 static float gCNS_VPM;
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38
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112
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290
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113 static float helium_pressure[16], nitrogen_pressure[16];
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114 static float surface_phase_volume_time[16];
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115 static float regenerated_radius_he[16], regenerated_radius_n2[16];
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116 static float allowable_gradient_he[16], allowable_gradient_n2[16];
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38
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117
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118 //_Bool deco_zone_reached;
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290
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119 static _Bool critical_volume_algorithm_off;
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120 static float max_first_stop_depth;
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121 static float max_deco_ceiling_depth;
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38
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122 //Boylslaw compensation
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290
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123 static float deco_gradient_he[16];
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124 static float deco_gradient_n2[16];
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125 static int vpm_calc_what;
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126 static int count_critical_volume_iteration;
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127 static short number_of_changes;
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128 static float depth_change[11];
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129 static float step_size_change[11];
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130 static float rate_change[11];
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131 static short mix_change[11];
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38
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132
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290
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133 static const _Bool vpm_b = true;
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38
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134
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907
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135 static SvpmTableState vpmTableState = VPM_TABLE_INIT;
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902
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136 static SDecoinfo vpmTable;
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137
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38
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138 extern const float float_buehlmann_N2_factor_expositon_20_seconds[];
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139 extern const float float_buehlmann_He_factor_expositon_20_seconds[];
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140 extern const float float_buehlmann_N2_factor_expositon_one_minute[];
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141 extern const float float_buehlmann_He_factor_expositon_one_minute[];
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142 extern const float float_buehlmann_N2_factor_expositon_five_minutes[];
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143 extern const float float_buehlmann_He_factor_expositon_five_minutes[];
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144 extern const float float_buehlmann_N2_factor_expositon_one_hour[];
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145 extern const float float_buehlmann_He_factor_expositon_one_hour[];
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146
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290
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147 static float depth_start_of_deco_calc;
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148 static float depth_start_of_deco_zone;
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149 static float first_stop_depth;
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150 static float run_time_start_of_deco_zone;
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38
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151
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290
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152 static float r_nint(float *x);
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153 static float r_int(float *x);
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154 static _Bool nullzeit_unter60;
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155 static int vpm_calc_status;
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156 static _Bool buehlmann_wait_exceeded = false;
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38
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157
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290
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158 static SLifeData* pInput = NULL;
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159 static SVpm* pVpm = NULL;
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160 static SDecoinfo* pDecoInfo = NULL;
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161 static SDiveSettings* pDiveSettings = NULL;
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162
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163 static float r_nint(float *x)
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38
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164 {
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165 return( (*x)>=0 ?
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166 floorf(*x + 0.5f) : -floorf(0.5f - *x) );
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167 }
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168
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290
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169 static float r_int(float *x)
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38
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170 {
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863
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171 return( (*x>0.0) ? floorf(*x) : -floorf(- *x) );
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38
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172 }
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173
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174 /** private functions
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175 */
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290
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176 extern int radius_root_finder (float *a, float *b, float *c,float *low_bound, float *high_bound, float *ending_radius);
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38
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177
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290
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178 static int nuclear_regeneration(float *dive_time);// clock_();
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179 static int calc_deco_ceiling(float *deco_ceiling_depth,_Bool fallowablw);
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180 static int critical_volume(float *deco_phase_volume_time); ;
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181 static int calc_start_of_deco_zone(float *starting_depth, float *rate, float *depth_start_of_deco_zone);
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182 static int calc_initial_allowable_gradient(void);
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183 static void decompression_stop(float *deco_stop_depth, float *step_size, _Bool final_deco_calculation);
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184 static int gas_loadings_ascent_descen(float* helium_pressure, float* nitrogen_pressure, float starting_depth,float ending_depth, float rate,_Bool check_gas_change);
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185 static int calc_surface_phase_volume_time(void);
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186 static int calc_max_actual_gradient(float *deco_stop_depth);
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187 static int projected_ascent(float *starting_depth, float *rate, float *deco_stop_depth, float *step_size);
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188 static void vpm_calc_deco(void);
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189 static int vpm_calc_critcal_volume(_Bool begin,_Bool calc_nulltime);
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190 static int vpm_check_converged(_Bool calc_nulltime);
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191 static int vpm_calc_final_deco(_Bool begin);
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192 static void BOYLES_LAW_COMPENSATION (float* First_Stop_Depth,float * Deco_Stop_Depth,float* Step_Size);
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292
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193 static int vpm_calc_ndl(void);
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290
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194 static void vpm_init_1(void);
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195 static void vpm_calc_deco_ceiling(void);
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196
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907
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197 uint8_t vpm_get_decozone(void);
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198
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290
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199 static void vpm_init_1(void)
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38
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200 {
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201 units_equal_msw = true;
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202 units_equal_fsw = false;
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203 altitude_dive_algorithm_off= true; //!Options: ON or OFF
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204 minimum_deco_stop_time=1.0; //!Options: float positive number
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205 critical_volume_algorithm_off= false; //!Options: ON or OFF
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206 run_time = 0.;
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207 //barometric_pressure = dive_data.surface * 10;
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208
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209 //mix_number = dive_data.selected_gas + 1;
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210
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211 max_first_stop_depth = 0;
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212 max_deco_ceiling_depth = 0;
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213 //deco_zone_reached = false;
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214 depth_start_of_deco_calc = 0;
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215 depth_start_of_deco_zone = 0;
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216 first_stop_depth = 0;
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217 run_time_start_of_deco_zone = 0;
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218
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219 gCNS_VPM = 0;
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220 }
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221
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222 float vpm_get_CNS(void)
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223 {
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224 return gCNS_VPM;
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225 }
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226
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902
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227
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228 void vpm_maintainTable(SLifeData* pLifeData,SDecoinfo* pDecoInfo)
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229 {
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230 static uint32_t lastDiveSecond = 0;
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231 uint8_t actual_deco_stop = 0;
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232 int8_t index = 0;
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233 uint8_t decreaseStopTime = 1;
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234
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235 if(lastDiveSecond < pLifeData->dive_time_seconds)
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236 {
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237 lastDiveSecond = pLifeData->dive_time_seconds;
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238 actual_deco_stop = decom_get_actual_deco_stop((SDiveState*)stateUsed);
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239
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240 pDecoInfo->output_time_to_surface_seconds = 0;
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241 for(index = DECOINFO_STRUCT_MAX_STOPS -1 ;index >= 0; index--)
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242 {
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243 if(pDecoInfo->output_stop_length_seconds[index] > 0)
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244 {
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245 if(decreaseStopTime)
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246 {
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907
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247 if((pLifeData->depth_meter > (float)(actual_deco_stop - 1.5))
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902
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248 && (pLifeData->depth_meter < (float)actual_deco_stop + 1.5))
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249 {
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250 pDecoInfo->output_stop_length_seconds[index]--;
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251 decreaseStopTime = 0;
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252 }
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907
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253 else if (pLifeData->depth_meter < (float)(actual_deco_stop - 1.5)) /* missed deco stop */
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254 {
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255 vpmTableState = VPM_TABLE_MISSED;
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256 pDecoInfo->output_stop_length_seconds[index] = 0;
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257 decreaseStopTime = 0;
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258 }
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902
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259 }
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260 pDecoInfo->output_time_to_surface_seconds += pDecoInfo->output_stop_length_seconds[index];
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261 }
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262 }
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263 pDecoInfo->output_time_to_surface_seconds += pLifeData->depth_meter / 10.0 * 60.0;
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264 }
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265 else if(lastDiveSecond > pLifeData->dive_time_seconds)
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266 {
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267 lastDiveSecond = pLifeData->dive_time_seconds;
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268 }
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269 }
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270
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38
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271 int vpm_calc(SLifeData* pINPUT,
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272 SDiveSettings* pSettings,
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273 SVpm* pVPM,
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274 SDecoinfo*
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275 pDECOINFO,
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276 int calc_what)
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277 {
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902
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278 static uint8_t vpmTableActive = 0;
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279
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280 vpm_init_1();
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281 //decom_CreateGasChangeList(pSettings, pINPUT);
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282 vpm_calc_what = calc_what;
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283 /**clear decoInfo*/
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902
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284
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285 if((vpmTableActive) && (vpm_calc_what == DECOSTOPS))
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286 {
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287 memcpy(&vpmTable, pDECOINFO, sizeof(SDecoinfo)); /* save changes done by e.g. the simulator */
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288 }
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38
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289 pDECOINFO->output_time_to_surface_seconds = 0;
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290 pDECOINFO->output_ndl_seconds = 0;
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291 pDECOINFO->output_ceiling_meter = 0;
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247
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292 pDECOINFO->super_saturation = 0;
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38
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293 uint8_t tmp_calc_status;
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294 for(int i=0;i<DECOINFO_STRUCT_MAX_STOPS;i++)
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295 {
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296 pDECOINFO->output_stop_length_seconds[i] = 0;
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297 }
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298
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305
305f251cc981
bugfix, consistency: show deco/NDL really after 1 minute divetime
Jan Mulder <jlmulder@xs4all.nl>
diff
changeset
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299 if(pINPUT->dive_time_seconds_without_surface_time < 60)
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38
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300 {
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292
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301 vpm_calc_status = CALC_NDL;
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38
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302 return vpm_calc_status;
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303 }
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304 pVpm = pVPM;
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305 pInput = pINPUT;
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306 pDecoInfo = pDECOINFO;
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307 pDiveSettings = pSettings;
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308
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292
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309 if(vpm_calc_status == CALC_NDL)
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38
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310 {
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292
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311 tmp_calc_status = vpm_calc_ndl();
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38
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312 }
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313 else
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314 {
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315 tmp_calc_status = CALC_BEGIN;
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316 }
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317 //Normal Deco calculation
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292
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318 if(tmp_calc_status != CALC_NDL)
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38
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319 {
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320 max_first_stop_depth = pVpm->max_first_stop_depth_save;
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321 run_time_start_of_deco_zone = pVpm->run_time_start_of_deco_zone_save;
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322 depth_start_of_deco_zone = pVpm->depth_start_of_deco_zone_save;
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323 for (int i = 0; i < 16; ++i) {
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324 helium_pressure[i] = pInput->tissue_helium_bar[i] * 10;
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325 nitrogen_pressure[i] = pInput->tissue_nitrogen_bar[i] * 10;
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326 }
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327 vpm_calc_deco();
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328 tmp_calc_status = vpm_calc_critcal_volume(true,false);
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329 if(vpm_calc_what == DECOSTOPS)
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330 {
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331 pVpm->max_first_stop_depth_save = max_first_stop_depth;
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332 pVpm->run_time_start_of_deco_zone_save = run_time_start_of_deco_zone;
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333 pVpm->depth_start_of_deco_zone_save = depth_start_of_deco_zone;
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334 }
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335 }
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336
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337 //Only Decostops not futute stops
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338 if(vpm_calc_what == DECOSTOPS)
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902
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339 {
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38
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340 vpm_calc_status = tmp_calc_status;
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902
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341 if(pSettings->vpm_tableMode) /* store the most conservative deco plan and stick to it. */
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342 {
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343 if((int16_t)(pDECOINFO->output_time_to_surface_seconds - vpmTable.output_time_to_surface_seconds) > 60)
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344 {
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345 memcpy(&vpmTable, pDECOINFO, sizeof(SDecoinfo));
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346 vpmTableActive = 1;
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907
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347 if(pVpm->deco_zone_reached) /* table should not change after deco zone was entered */
|
|
|
348 {
|
|
|
349 if(vpmTableState != VPM_TABLE_MISSED)
|
|
|
350 {
|
|
|
351 vpmTableState = VPM_TABLE_WARNING;
|
|
|
352 }
|
|
|
353 }
|
|
902
|
354 }
|
|
|
355 else
|
|
|
356 {
|
|
|
357 if(vpmTable.output_time_to_surface_seconds > 0)
|
|
|
358 {
|
|
|
359 vpm_maintainTable(pINPUT, &vpmTable);
|
|
|
360 vpmTable.output_ceiling_meter = pDECOINFO->output_ceiling_meter;
|
|
|
361 memcpy(pDECOINFO, &vpmTable, sizeof(SDecoinfo));
|
|
|
362 }
|
|
|
363 }
|
|
|
364 }
|
|
|
365 }
|
|
38
|
366 return vpm_calc_status;
|
|
|
367 }
|
|
|
368
|
|
|
369 void vpm_saturation_after_ascent(SLifeData* input)
|
|
|
370 {
|
|
|
371 int i = 0;
|
|
|
372 for (i = 0; i < 16; ++i) {
|
|
|
373 pInput->tissue_helium_bar[i] = helium_pressure[i] / 10;
|
|
|
374 pInput->tissue_nitrogen_bar[i] = nitrogen_pressure[i] / 10;
|
|
|
375 }
|
|
|
376 pInput->pressure_ambient_bar = pInput->pressure_surface_bar;
|
|
|
377 }
|
|
|
378 /* =============================================================================== */
|
|
|
379 /* NOTE ABOUT PRESSURE UNITS USED IN CALCULATIONS: */
|
|
|
380 /* It is the convention in decompression calculations to compute all gas */
|
|
|
381 /* loadings, absolute pressures, partial pressures, etc., in the units of */
|
|
|
382 /* depth pressure that you are diving - either feet of seawater (fsw) or */
|
|
|
383 /* meters of seawater (msw). This program follows that convention with the */
|
|
|
384 /* the exception that all VPM calculations are performed in SI units (by */
|
|
|
385 /* necessity). Accordingly, there are several conversions back and forth */
|
|
|
386 /* between the diving pressure units and the SI units. */
|
|
|
387 /* =============================================================================== */
|
|
|
388 /* =============================================================================== */
|
|
|
389 /* FUNCTION SUBPROGRAM FOR GAS LOADING CALCULATIONS - ASCENT AND DESCENT */
|
|
|
390 /* =============================================================================== */
|
|
|
391
|
|
|
392
|
|
|
393
|
|
|
394 /* =============================================================================== */
|
|
|
395 /* SUBROUTINE GAS_LOADINGS_ASCENT_DESCENT */
|
|
|
396 /* Purpose: This subprogram applies the Schreiner equation to update the */
|
|
|
397 /* gas loadings (partial pressures of helium and nitrogen) in the half-time */
|
|
|
398 /* compartments due to a linear ascent or descent segment at a constant rate. */
|
|
|
399 /* =============================================================================== */
|
|
|
400
|
|
290
|
401 static int gas_loadings_ascent_descen(float* helium_pressure,
|
|
38
|
402 float* nitrogen_pressure,
|
|
|
403 float starting_depth,
|
|
|
404 float ending_depth,
|
|
|
405 float rate,_Bool check_gas_change)
|
|
|
406 {
|
|
|
407 short i;
|
|
|
408 float initial_inspired_n2_pressure,
|
|
|
409 initial_inspired_he_pressure, nitrogen_rate,
|
|
|
410 last_run_time,
|
|
|
411 starting_ambient_pressure,
|
|
|
412 ending_ambient_pressure;
|
|
|
413 float initial_helium_pressure[16];
|
|
|
414 float initial_nitrogen_pressure[16];
|
|
|
415 float helium_rate;
|
|
|
416 float fraction_helium_begin;
|
|
|
417 float fraction_helium_end;
|
|
|
418 float fraction_nitrogen_begin;
|
|
|
419 float fraction_nitrogen_end;
|
|
|
420 float ending_depth_tmp = ending_depth;
|
|
|
421 float segment_time_tmp = 0;
|
|
|
422 /* loop */
|
|
|
423 /* =============================================================================== */
|
|
|
424 /* CALCULATIONS */
|
|
|
425 /* =============================================================================== */
|
|
|
426 segment_time = (ending_depth_tmp - starting_depth) / rate;
|
|
|
427 last_run_time = run_time;
|
|
|
428 run_time = last_run_time + segment_time;
|
|
|
429 do {
|
|
|
430 ending_depth_tmp = ending_depth;
|
|
|
431 if (starting_depth > ending_depth && check_gas_change && number_of_changes > 1)
|
|
|
432 {
|
|
|
433 for (i = 1; i < number_of_changes; ++i)
|
|
|
434 {
|
|
|
435 if (depth_change[i] < starting_depth && depth_change[i] > ending_depth)
|
|
|
436 {
|
|
|
437 ending_depth_tmp = depth_change[i];
|
|
|
438 break;
|
|
|
439 }
|
|
|
440 }
|
|
|
441 for (i = 1; i < number_of_changes; ++i)
|
|
|
442 {
|
|
|
443 if (depth_change[i] >= starting_depth)
|
|
|
444 {
|
|
|
445 mix_number = mix_change[i];
|
|
|
446 }
|
|
|
447 }
|
|
|
448 }
|
|
|
449 segment_time_tmp = (ending_depth_tmp - starting_depth) / rate;
|
|
|
450 ending_ambient_pressure = ending_depth_tmp + barometric_pressure;
|
|
|
451 starting_ambient_pressure = starting_depth + barometric_pressure;
|
|
|
452 decom_get_inert_gases( starting_ambient_pressure / 10, (&pDiveSettings->decogaslist[mix_number]), &fraction_nitrogen_begin, &fraction_helium_begin );
|
|
|
453 decom_get_inert_gases( ending_ambient_pressure / 10, (&pDiveSettings->decogaslist[mix_number]), &fraction_nitrogen_end, &fraction_helium_end );
|
|
|
454
|
|
|
455 initial_inspired_he_pressure = (starting_ambient_pressure - WATER_VAPOR_PRESSURE) * fraction_helium_begin;
|
|
|
456 initial_inspired_n2_pressure = (starting_ambient_pressure - WATER_VAPOR_PRESSURE) * fraction_nitrogen_begin;
|
|
|
457 //helium_rate = *rate * fraction_helium[mix_number - 1];
|
|
|
458 helium_rate = ((ending_ambient_pressure - WATER_VAPOR_PRESSURE)* fraction_helium_end - initial_inspired_he_pressure)/segment_time_tmp;
|
|
|
459 //nitrogen_rate2 = *rate * fraction_nitrogen[mix_number - 1];
|
|
|
460 nitrogen_rate = ((ending_ambient_pressure - WATER_VAPOR_PRESSURE)* fraction_nitrogen_end - initial_inspired_n2_pressure)/segment_time_tmp;
|
|
|
461
|
|
|
462
|
|
|
463 decom_oxygen_calculate_cns_stage_SchreinerStyle(segment_time_tmp,&pDiveSettings->decogaslist[mix_number],starting_ambient_pressure/10,ending_ambient_pressure/10,&gCNS_VPM);
|
|
|
464 //if(fabs(nitrogen_rate - nitrogen_rate2) > 0.000001)
|
|
|
465 //return -2;
|
|
|
466 for (i = 1; i <= 16; ++i)
|
|
|
467 {
|
|
|
468 initial_helium_pressure[i - 1] = helium_pressure[i - 1];
|
|
|
469 initial_nitrogen_pressure[i - 1] = nitrogen_pressure[i - 1];
|
|
|
470 helium_pressure[i - 1] =
|
|
|
471 schreiner_equation__2(&initial_inspired_he_pressure,
|
|
|
472 &helium_rate,
|
|
|
473 &segment_time,
|
|
|
474 &HELIUM_TIME_CONSTANT[i - 1],
|
|
|
475 &initial_helium_pressure[i - 1]);
|
|
|
476 nitrogen_pressure[i - 1] =
|
|
|
477 schreiner_equation__2(&initial_inspired_n2_pressure,
|
|
|
478 &nitrogen_rate,
|
|
|
479 &segment_time,
|
|
|
480 &NITROGEN_TIME_CONSTANT[i - 1],
|
|
|
481 &initial_nitrogen_pressure[i - 1]);
|
|
|
482
|
|
|
483 //nextround???
|
|
|
484
|
|
|
485 }
|
|
|
486 starting_depth = ending_depth_tmp;
|
|
|
487 } while(ending_depth_tmp > ending_depth);
|
|
|
488
|
|
|
489 return 0;
|
|
|
490 } /* gas_loadings_ascent_descen */
|
|
|
491
|
|
290
|
492 static float last_phase_volume_time[16];
|
|
|
493 static float n2_pressure_start_of_deco_zone[16];
|
|
|
494 static float he_pressure_start_of_deco_zone[16];
|
|
|
495 static float phase_volume_time[16];
|
|
|
496 static float n2_pressure_start_of_ascent[16];
|
|
|
497 static float he_pressure_start_of_ascent[16];
|
|
|
498 static float run_time_start_of_deco_calc;
|
|
|
499 static float starting_depth;
|
|
|
500 static float last_run_time;
|
|
|
501 static float deco_phase_volume_time;
|
|
|
502 static float run_time_start_of_ascent;
|
|
|
503 static float rate;
|
|
|
504 static float step_size;
|
|
|
505 static _Bool vpm_violates_buehlmann;
|
|
38
|
506
|
|
290
|
507 static void vpm_calc_deco(void)
|
|
38
|
508 {
|
|
|
509 /* System generated locals */
|
|
|
510
|
|
|
511 //float deepest_possible_stop_depth;
|
|
|
512 // altitude_of_dive,
|
|
|
513 short i;
|
|
|
514 int j = 0;
|
|
|
515
|
|
|
516 // float rounding_operation;
|
|
|
517
|
|
|
518 /* =============================================================================== */
|
|
|
519 /* INPUT PARAMETERS TO BE USED FOR STAGED DECOMPRESSION AND SAVE IN ARRAYS. */
|
|
|
520 /* ASSIGN INITAL PARAMETERS TO BE USED AT START OF ASCENT */
|
|
|
521 /* The user has the ability to change mix, ascent rate, and step size in any */
|
|
|
522 /* combination at any depth during the ascent. */
|
|
|
523 /* =============================================================================== */
|
|
|
524
|
|
|
525 run_time = ((float)pInput->dive_time_seconds )/ 60;
|
|
|
526 count_critical_volume_iteration = 0;
|
|
|
527 number_of_changes = 1;
|
|
|
528
|
|
|
529 barometric_pressure = pInput->pressure_surface_bar * 10;
|
|
|
530 depth_change[0] =(pInput->pressure_ambient_bar - pInput->pressure_surface_bar)* 10;
|
|
|
531 mix_change[0] = 0;
|
|
|
532 rate_change[0 ] = -10;// neu 160215 hw, zuvor: -12;
|
|
|
533 step_size_change[0] = 3;
|
|
|
534 vpm_violates_buehlmann = false;
|
|
|
535
|
|
|
536 for (i = 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++)
|
|
|
537 {
|
|
|
538 depth_change[i] = 0;
|
|
|
539 mix_change[i] = 0;
|
|
|
540 }
|
|
|
541 j = 0;
|
|
|
542
|
|
|
543 for (i = 1; i < BUEHLMANN_STRUCT_MAX_GASES; i++)
|
|
|
544 {
|
|
830
|
545 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero >= depth_change[0] + 1)
|
|
|
546 && (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc))
|
|
38
|
547 continue;
|
|
|
548
|
|
830
|
549 if((pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero <= 0)
|
|
|
550 || (pDiveSettings->gas[pDiveSettings->decogaslist[i].GasIdInSettings].note.ub.decocalc == 0))
|
|
38
|
551 break;
|
|
|
552
|
|
|
553 j++;
|
|
|
554 number_of_changes ++;
|
|
|
555 depth_change[j] = pDiveSettings->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero ;
|
|
|
556 mix_change[j] = i;
|
|
|
557 rate_change[j] = -10;// neu 160215 hw, zuvor: -12;
|
|
|
558 step_size_change[j] = 3;
|
|
|
559 }
|
|
|
560
|
|
|
561 starting_depth = depth_change[0] ;
|
|
|
562 mix_number = mix_change[0] ;
|
|
|
563 rate = rate_change[0];
|
|
|
564 step_size = step_size_change[0];
|
|
|
565
|
|
|
566 for (i = 0; i < 16; ++i) {
|
|
|
567 he_pressure_start_of_ascent[i ] = helium_pressure[i];
|
|
|
568 n2_pressure_start_of_ascent[i] = nitrogen_pressure[i];
|
|
|
569 }
|
|
|
570 run_time_start_of_ascent = run_time;
|
|
|
571 if(starting_depth <= depth_start_of_deco_zone && vpm_calc_what == DECOSTOPS)
|
|
|
572 {
|
|
|
573 pVpm->deco_zone_reached = true;
|
|
|
574 depth_start_of_deco_calc = starting_depth;
|
|
|
575 critical_volume_algorithm_off = true;
|
|
|
576 }
|
|
|
577 else
|
|
|
578 {
|
|
|
579 //if(deco_zone_reached)
|
|
|
580 //{
|
|
|
581 pVpm->deco_zone_reached = false;
|
|
|
582 critical_volume_algorithm_off = false;
|
|
|
583 //max_first_stop_depth = 0;
|
|
|
584 //max_first_stop_depth_save = 0;
|
|
|
585 //}
|
|
|
586 /* =============================================================================== */
|
|
|
587 /* BEGIN PROCESS OF ASCENT AND DECOMPRESSION */
|
|
|
588 /* First, calculate the regeneration of critical radii that takes place over */
|
|
|
589 /* the dive time. The regeneration time constant has a time scale of weeks */
|
|
|
590 /* so this will have very little impact on dives of normal length, but will */
|
|
|
591 /* have major impact for saturation dives. */
|
|
|
592 /* =============================================================================== */
|
|
|
593
|
|
|
594 nuclear_regeneration(&run_time);
|
|
|
595
|
|
|
596 /* =============================================================================== */
|
|
|
597 /* CALCULATE INITIAL ALLOWABLE GRADIENTS FOR ASCENT */
|
|
|
598 /* This is based on the maximum effective crushing pressure on critical radii */
|
|
|
599 /* in each compartment achieved during the dive profile. */
|
|
|
600 /* =============================================================================== */
|
|
|
601
|
|
|
602 calc_initial_allowable_gradient();
|
|
|
603
|
|
|
604 /* =============================================================================== */
|
|
|
605 /* SAVE VARIABLES AT START OF ASCENT (END OF BOTTOM TIME) SINCE THESE WILL */
|
|
|
606 /* BE USED LATER TO COMPUTE THE FINAL ASCENT PROFILE THAT IS WRITTEN TO THE */
|
|
|
607 /* OUTPUT FILE. */
|
|
|
608 /* The VPM uses an iterative process to compute decompression schedules so */
|
|
|
609 /* there will be more than one pass through the decompression loop. */
|
|
|
610 /* =============================================================================== */
|
|
|
611
|
|
|
612 /* =============================================================================== */
|
|
|
613 /* CALCULATE THE DEPTH WHERE THE DECOMPRESSION ZONE BEGINS FOR THIS PROFILE */
|
|
|
614 /* BASED ON THE INITIAL ASCENT PARAMETERS AND WRITE THE DEEPEST POSSIBLE */
|
|
|
615 /* DECOMPRESSION STOP DEPTH TO THE OUTPUT FILE */
|
|
|
616 /* Knowing where the decompression zone starts is very important. Below */
|
|
|
617 /* that depth there is no possibility for bubble formation because there */
|
|
|
618 /* will be no supersaturation gradients. Deco stops should never start */
|
|
|
619 /* below the deco zone. The deepest possible stop deco stop depth is */
|
|
|
620 /* defined as the next "standard" stop depth above the point where the */
|
|
|
621 /* leading compartment enters the deco zone. Thus, the program will not */
|
|
|
622 /* base this calculation on step sizes larger than 10 fsw or 3 msw. The */
|
|
|
623 /* deepest possible stop depth is not used in the program, per se, rather */
|
|
|
624 /* it is information to tell the diver where to start putting on the brakes */
|
|
|
625 /* during ascent. This should be prominently displayed by any deco program. */
|
|
|
626 /* =============================================================================== */
|
|
|
627
|
|
|
628 calc_start_of_deco_zone(&starting_depth, &rate, &depth_start_of_deco_zone);
|
|
|
629 /* =============================================================================== */
|
|
|
630 /* TEMPORARILY ASCEND PROFILE TO THE START OF THE DECOMPRESSION ZONE, SAVE */
|
|
|
631 /* VARIABLES AT THIS POINT, AND INITIALIZE VARIABLES FOR CRITICAL VOLUME LOOP */
|
|
|
632 /* The iterative process of the VPM Critical Volume Algorithm will operate */
|
|
|
633 /* only in the decompression zone since it deals with excess gas volume */
|
|
|
634 /* released as a result of supersaturation gradients (not possible below the */
|
|
|
635 /* decompression zone). */
|
|
|
636 /* =============================================================================== */
|
|
|
637 gas_loadings_ascent_descen(helium_pressure,nitrogen_pressure, starting_depth, depth_start_of_deco_zone, rate, true);
|
|
|
638
|
|
|
639 run_time_start_of_deco_zone = run_time;
|
|
|
640 depth_start_of_deco_calc = depth_start_of_deco_zone;
|
|
|
641
|
|
|
642 for (i = 0; i < 16; ++i)
|
|
|
643 {
|
|
|
644 pVpm->max_actual_gradient[i] = 0.;
|
|
|
645 }
|
|
|
646 }
|
|
|
647
|
|
|
648 for (i = 0; i < 16; ++i)
|
|
|
649 {
|
|
|
650 surface_phase_volume_time[i] = 0.;
|
|
|
651 last_phase_volume_time[i] = 0.;
|
|
|
652 he_pressure_start_of_deco_zone[i] = helium_pressure[i];
|
|
|
653 n2_pressure_start_of_deco_zone[i] = nitrogen_pressure[i];
|
|
|
654 //pVpm->max_actual_gradient[i] = 0.;
|
|
|
655 }
|
|
|
656 run_time_start_of_deco_calc = run_time;
|
|
|
657 }
|
|
|
658 /* =============================================================================== */
|
|
|
659 /* START OF CRITICAL VOLUME LOOP */
|
|
|
660 /* This loop operates between Lines 50 and 100. If the Critical Volume */
|
|
|
661 /* Algorithm is toggled "off" in the program settings, there will only be */
|
|
|
662 /* one pass through this loop. Otherwise, there will be two or more passes */
|
|
|
663 /* through this loop until the deco schedule is "converged" - that is when a */
|
|
|
664 /* comparison between the phase volume time of the present iteration and the */
|
|
|
665 /* last iteration is less than or equal to one minute. This implies that */
|
|
|
666 /* the volume of released gas in the most recent iteration differs from the */
|
|
|
667 /* "critical" volume limit by an acceptably small amount. The critical */
|
|
|
668 /* volume limit is set by the Critical Volume Parameter Lambda in the program */
|
|
|
669 /* settings (default setting is 7500 fsw-min with adjustability range from */
|
|
|
670 /* from 6500 to 8300 fsw-min according to Bruce Wienke). */
|
|
|
671 /* =============================================================================== */
|
|
|
672 /* L50: */
|
|
|
673
|
|
290
|
674 static float deco_stop_depth;
|
|
|
675 static int vpm_calc_critcal_volume(_Bool begin,
|
|
38
|
676 _Bool calc_nulltime)
|
|
|
677 { /* loop will run continuous there is an exit stateme */
|
|
|
678
|
|
|
679 short i;
|
|
|
680
|
|
|
681 float rounding_operation2;
|
|
|
682 //float ending_depth;
|
|
|
683 float deco_ceiling_depth;
|
|
|
684
|
|
|
685 //float deco_time;
|
|
|
686 int count = 0;
|
|
|
687 _Bool first_stop;
|
|
|
688 int dp = 0;
|
|
|
689 float tissue_He_saturation[16];
|
|
|
690 float tissue_N2_saturation[16];
|
|
|
691 float vpm_buehlmann_safety_gradient = 1.0f - (((float)pDiveSettings->vpm_conservatism) / 40);
|
|
|
692 /* =============================================================================== */
|
|
|
693 /* CALCULATE CURRENT DECO CEILING BASED ON ALLOWABLE SUPERSATURATION */
|
|
|
694 /* GRADIENTS AND SET FIRST DECO STOP. CHECK TO MAKE SURE THAT SELECTED STEP */
|
|
|
695 /* SIZE WILL NOT ROUND UP FIRST STOP TO A DEPTH THAT IS BELOW THE DECO ZONE. */
|
|
|
696 /* =============================================================================== */
|
|
|
697 if(begin)
|
|
|
698 {
|
|
|
699 if(depth_start_of_deco_calc < max_first_stop_depth )
|
|
|
700 {
|
|
|
701 if(vpm_b)
|
|
|
702 {
|
|
|
703 BOYLES_LAW_COMPENSATION(&max_first_stop_depth, &depth_start_of_deco_calc, &step_size);
|
|
|
704 }
|
|
|
705 calc_deco_ceiling(&deco_ceiling_depth, false);
|
|
|
706 }
|
|
|
707 else
|
|
|
708 calc_deco_ceiling(&deco_ceiling_depth, true);
|
|
|
709
|
|
|
710
|
|
|
711 if (deco_ceiling_depth <= 0.0f) {
|
|
|
712 deco_stop_depth = 0.0f;
|
|
|
713 } else {
|
|
|
714 rounding_operation2 = deco_ceiling_depth / step_size + ( float)0.5f;
|
|
|
715 deco_stop_depth = r_nint(&rounding_operation2) * step_size;
|
|
|
716 }
|
|
|
717
|
|
|
718 // buehlmann safety
|
|
|
719 if(buehlmannSafety)
|
|
|
720 {
|
|
|
721 for (i = 0; i < 16; i++)
|
|
|
722 {
|
|
863
|
723 tissue_He_saturation[i] = helium_pressure[i] / 10.0;
|
|
|
724 tissue_N2_saturation[i] = nitrogen_pressure[i] / 10.0;
|
|
38
|
725 }
|
|
|
726
|
|
|
727 if(!decom_tissue_test_tolerance(tissue_N2_saturation, tissue_He_saturation, vpm_buehlmann_safety_gradient, (deco_stop_depth / 10.0f) + pInput->pressure_surface_bar))
|
|
|
728 {
|
|
|
729
|
|
|
730 vpm_violates_buehlmann = true;
|
|
|
731 do {
|
|
863
|
732 deco_stop_depth += 3.0;
|
|
38
|
733 } while (!decom_tissue_test_tolerance(tissue_N2_saturation, tissue_He_saturation, vpm_buehlmann_safety_gradient, (deco_stop_depth / 10.0f) + pInput->pressure_surface_bar));
|
|
|
734 }
|
|
|
735 }
|
|
|
736
|
|
|
737 /* =============================================================================== */
|
|
|
738 /* PERFORM A SEPARATE "PROJECTED ASCENT" OUTSIDE OF THE MAIN PROGRAM TO MAKE */
|
|
|
739 /* SURE THAT AN INCREASE IN GAS LOADINGS DURING ASCENT TO THE FIRST STOP WILL */
|
|
|
740 /* NOT CAUSE A VIOLATION OF THE DECO CEILING. IF SO, ADJUST THE FIRST STOP */
|
|
|
741 /* DEEPER BASED ON STEP SIZE UNTIL A SAFE ASCENT CAN BE MADE. */
|
|
|
742 /* Note: this situation is a possibility when ascending from extremely deep */
|
|
|
743 /* dives or due to an unusual gas mix selection. */
|
|
|
744 /* CHECK AGAIN TO MAKE SURE THAT ADJUSTED FIRST STOP WILL NOT BE BELOW THE */
|
|
|
745 /* DECO ZONE. */
|
|
|
746 /* =============================================================================== */
|
|
|
747 if (deco_stop_depth < depth_start_of_deco_calc)
|
|
|
748 {
|
|
|
749 projected_ascent(&depth_start_of_deco_calc, &rate, &deco_stop_depth, &step_size);
|
|
|
750 }
|
|
|
751
|
|
|
752 /*if (deco_stop_depth > depth_start_of_deco_zone) {
|
|
|
753 printf("\t\n");
|
|
|
754 printf(fmt_905);
|
|
|
755 printf(fmt_900);
|
|
|
756 printf("\nPROGRAM TERMINATED\n");
|
|
|
757 exit(1);
|
|
|
758 }*/
|
|
|
759
|
|
|
760 /* =============================================================================== */
|
|
|
761 /* HANDLE THE SPECIAL CASE WHEN NO DECO STOPS ARE REQUIRED - ASCENT CAN BE */
|
|
|
762 /* MADE DIRECTLY TO THE SURFACE */
|
|
|
763 /* Write ascent data to output file and exit the Critical Volume Loop. */
|
|
|
764 /* =============================================================================== */
|
|
|
765
|
|
|
766 if (deco_stop_depth == 0.0f)
|
|
|
767 {
|
|
|
768 if(calc_nulltime)
|
|
|
769 {
|
|
|
770 return CALC_END;
|
|
|
771 }
|
|
|
772 if(pVpm->deco_zone_reached)
|
|
|
773 {
|
|
|
774 for(dp = 0;dp < DECOINFO_STRUCT_MAX_STOPS;dp++)
|
|
|
775 {
|
|
|
776 pDecoInfo->output_stop_length_seconds[dp] = 0;
|
|
|
777 }
|
|
|
778 pDecoInfo->output_ndl_seconds = 0;
|
|
|
779 }
|
|
|
780
|
|
292
|
781 return CALC_NDL;
|
|
38
|
782 /* exit the critical volume l */
|
|
|
783 }
|
|
|
784
|
|
|
785 /* =============================================================================== */
|
|
|
786 /* ASSIGN VARIABLES FOR ASCENT FROM START OF DECO ZONE TO FIRST STOP. SAVE */
|
|
|
787 /* FIRST STOP DEPTH FOR LATER USE WHEN COMPUTING THE FINAL ASCENT PROFILE */
|
|
|
788 /* =============================================================================== */
|
|
877
|
789 deco_stop_depth = fmaxf(deco_stop_depth,(float)pDiveSettings->last_stop_depth_bar * 10);
|
|
38
|
790 starting_depth = depth_start_of_deco_calc;
|
|
|
791 first_stop_depth = deco_stop_depth;
|
|
|
792 first_stop = true;
|
|
|
793 }
|
|
|
794 /* =============================================================================== */
|
|
|
795 /* DECO STOP LOOP BLOCK WITHIN CRITICAL VOLUME LOOP */
|
|
|
796 /* This loop computes a decompression schedule to the surface during each */
|
|
|
797 /* iteration of the critical volume loop. No output is written from this */
|
|
|
798 /* loop, rather it computes a schedule from which the in-water portion of the */
|
|
|
799 /* total phase volume time (Deco_Phase_Volume_Time) can be extracted. Also, */
|
|
|
800 /* the gas loadings computed at the end of this loop are used the subroutine */
|
|
|
801 /* which computes the out-of-water portion of the total phase volume time */
|
|
|
802 /* (Surface_Phase_Volume_Time) for that schedule. */
|
|
|
803
|
|
|
804 /* Note that exit is made from the loop after last ascent is made to a deco */
|
|
|
805 /* stop depth that is less than or equal to zero. A final deco stop less */
|
|
|
806 /* than zero can happen when the user makes an odd step size change during */
|
|
|
807 /* ascent - such as specifying a 5 msw step size change at the 3 msw stop! */
|
|
|
808 /* =============================================================================== */
|
|
|
809
|
|
|
810 while(true) /* loop will run continuous there is an break statement */
|
|
|
811 {
|
|
|
812 if(starting_depth > deco_stop_depth )
|
|
|
813 gas_loadings_ascent_descen(helium_pressure, nitrogen_pressure, starting_depth, deco_stop_depth, rate,first_stop);
|
|
|
814
|
|
|
815 first_stop = false;
|
|
|
816 if (deco_stop_depth <= 0.0f)
|
|
|
817 {
|
|
|
818 break;
|
|
|
819 }
|
|
|
820 if (number_of_changes > 1)
|
|
|
821 {
|
|
|
822 int i1 = number_of_changes;
|
|
|
823 for (i = 2; i <= i1; ++i) {
|
|
|
824 if (depth_change[i - 1] >= deco_stop_depth)
|
|
|
825 {
|
|
|
826 mix_number = mix_change[i - 1];
|
|
|
827 rate = rate_change[i - 1];
|
|
|
828 step_size = step_size_change[i - 1];
|
|
|
829 }
|
|
|
830 }
|
|
|
831 }
|
|
|
832 if(vpm_b)
|
|
|
833 {
|
|
|
834 float fist_stop_depth2 = fmaxf(first_stop_depth,max_first_stop_depth);
|
|
|
835 BOYLES_LAW_COMPENSATION(&fist_stop_depth2, &deco_stop_depth, &step_size);
|
|
|
836 }
|
|
|
837 decompression_stop(&deco_stop_depth, &step_size, false);
|
|
|
838 starting_depth = deco_stop_depth;
|
|
|
839
|
|
877
|
840 if(deco_stop_depth == (float)pDiveSettings->last_stop_depth_bar * 10)
|
|
38
|
841 deco_stop_depth = 0;
|
|
|
842 else
|
|
|
843 {
|
|
|
844 deco_stop_depth = deco_stop_depth - step_size;
|
|
877
|
845 deco_stop_depth = fmaxf(deco_stop_depth,(float)pDiveSettings->last_stop_depth_bar * 10);
|
|
38
|
846 }
|
|
|
847
|
|
|
848 count++;
|
|
|
849 //if(count > 14)
|
|
|
850 //return CALC_CRITICAL2;
|
|
|
851 /* L60: */
|
|
|
852 }
|
|
|
853
|
|
|
854 return vpm_check_converged(calc_nulltime);
|
|
|
855 }
|
|
|
856 /* =============================================================================== */
|
|
|
857 /* COMPUTE TOTAL PHASE VOLUME TIME AND MAKE CRITICAL VOLUME COMPARISON */
|
|
|
858 /* The deco phase volume time is computed from the run time. The surface */
|
|
|
859 /* phase volume time is computed in a subroutine based on the surfacing gas */
|
|
|
860 /* loadings from previous deco loop block. Next the total phase volume time */
|
|
|
861 /* (in-water + surface) for each compartment is compared against the previous */
|
|
|
862 /* total phase volume time. The schedule is converged when the difference is */
|
|
|
863 /* less than or equal to 1 minute in any one of the 16 compartments. */
|
|
|
864
|
|
|
865 /* Note: the "phase volume time" is somewhat of a mathematical concept. */
|
|
|
866 /* It is the time divided out of a total integration of supersaturation */
|
|
|
867 /* gradient x time (in-water and surface). This integration is multiplied */
|
|
|
868 /* by the excess bubble number to represent the amount of free-gas released */
|
|
|
869 /* as a result of allowing a certain number of excess bubbles to form. */
|
|
|
870 /* =============================================================================== */
|
|
|
871 /* end of deco stop loop */
|
|
|
872
|
|
290
|
873 static int vpm_check_converged(_Bool calc_nulltime)
|
|
38
|
874 {
|
|
|
875
|
|
|
876 short i;
|
|
|
877 float critical_volume_comparison;
|
|
|
878 float r1;
|
|
|
879 _Bool schedule_converged = false;
|
|
|
880
|
|
|
881
|
|
|
882 deco_phase_volume_time = run_time - run_time_start_of_deco_zone;
|
|
|
883 calc_surface_phase_volume_time();
|
|
|
884
|
|
|
885 for (i = 1; i <= 16; ++i)
|
|
|
886 {
|
|
|
887 phase_volume_time[i - 1] =
|
|
|
888 deco_phase_volume_time + surface_phase_volume_time[i - 1];
|
|
|
889 critical_volume_comparison = (r1 = phase_volume_time[i - 1] - last_phase_volume_time[i - 1], fabs(r1));
|
|
|
890
|
|
|
891 if (critical_volume_comparison <= 1.0f)
|
|
|
892 {
|
|
|
893 schedule_converged = true;
|
|
|
894 }
|
|
|
895 }
|
|
|
896
|
|
|
897 /* =============================================================================== */
|
|
|
898 /* CRITICAL VOLUME DECISION TREE BETWEEN LINES 70 AND 99 */
|
|
|
899 /* There are two options here. If the Critical Volume Agorithm setting is */
|
|
|
900 /* "on" and the schedule is converged, or the Critical Volume Algorithm */
|
|
|
901 /* setting was "off" in the first place, the program will re-assign variables */
|
|
|
902 /* to their values at the start of ascent (end of bottom time) and process */
|
|
|
903 /* a complete decompression schedule once again using all the same ascent */
|
|
|
904 /* parameters and first stop depth. This decompression schedule will match */
|
|
|
905 /* the last iteration of the Critical Volume Loop and the program will write */
|
|
|
906 /* the final deco schedule to the output file. */
|
|
|
907
|
|
|
908 /* Note: if the Critical Volume Agorithm setting was "off", the final deco */
|
|
|
909 /* schedule will be based on "Initial Allowable Supersaturation Gradients." */
|
|
|
910 /* If it was "on", the final schedule will be based on "Adjusted Allowable */
|
|
|
911 /* Supersaturation Gradients" (gradients that are "relaxed" as a result of */
|
|
|
912 /* the Critical Volume Algorithm). */
|
|
|
913
|
|
|
914 /* If the Critical Volume Agorithm setting is "on" and the schedule is not */
|
|
|
915 /* converged, the program will re-assign variables to their values at the */
|
|
|
916 /* start of the deco zone and process another trial decompression schedule. */
|
|
|
917 /* =============================================================================== */
|
|
|
918 /* L70: */
|
|
|
919 //Not more than 4 iteration allowed
|
|
|
920 count_critical_volume_iteration++;
|
|
|
921 if(count_critical_volume_iteration > 4)
|
|
|
922 {
|
|
|
923 //return CALC_FINAL_DECO;
|
|
|
924 if(calc_nulltime)
|
|
|
925 return CALC_FINAL_DECO;
|
|
|
926 else
|
|
|
927 return vpm_calc_final_deco(true);
|
|
|
928 }
|
|
|
929 if (schedule_converged || critical_volume_algorithm_off)
|
|
|
930 {
|
|
|
931
|
|
|
932 //return CALC_FINAL_DECO;
|
|
|
933 if(calc_nulltime)
|
|
|
934 return CALC_FINAL_DECO;
|
|
|
935 else
|
|
|
936 return vpm_calc_final_deco(true);
|
|
|
937 /* final deco schedule */
|
|
|
938 /* exit critical volume l */
|
|
|
939
|
|
|
940 /* =============================================================================== */
|
|
|
941 /* IF SCHEDULE NOT CONVERGED, COMPUTE RELAXED ALLOWABLE SUPERSATURATION */
|
|
|
942 /* GRADIENTS WITH VPM CRITICAL VOLUME ALGORITHM AND PROCESS ANOTHER */
|
|
|
943 /* ITERATION OF THE CRITICAL VOLUME LOOP */
|
|
|
944 /* =============================================================================== */
|
|
|
945
|
|
|
946 } else {
|
|
|
947 critical_volume(&deco_phase_volume_time);
|
|
|
948 deco_phase_volume_time = 0.;
|
|
|
949 run_time = run_time_start_of_deco_calc;
|
|
|
950 starting_depth = depth_start_of_deco_calc;
|
|
|
951 mix_number = mix_change[0];
|
|
|
952 rate = rate_change[0];
|
|
|
953 step_size = step_size_change[0];
|
|
|
954 for (i = 1; i <= 16; ++i)
|
|
|
955 {
|
|
|
956 last_phase_volume_time[i - 1] = phase_volume_time[i - 1];
|
|
|
957 helium_pressure[i - 1] = he_pressure_start_of_deco_zone[i - 1];
|
|
|
958 nitrogen_pressure[i - 1] = n2_pressure_start_of_deco_zone[i - 1];
|
|
|
959 }
|
|
|
960 if(calc_nulltime)
|
|
|
961 return CALC_CRITICAL;
|
|
|
962 else
|
|
|
963 return vpm_calc_critcal_volume(true, false);
|
|
|
964 }
|
|
|
965 /* end of critical volume decision */
|
|
|
966 /* L100: */
|
|
|
967 // }/* end of critical vol loop */
|
|
|
968 }
|
|
|
969
|
|
290
|
970 static void vpm_calc_deco_ceiling(void)
|
|
38
|
971 {
|
|
|
972
|
|
|
973 short i;
|
|
|
974 // hw 1601209 float r1;
|
|
|
975 // hw 1601209 float stop_time;
|
|
|
976 // hw 1601209 int count = 0;
|
|
|
977 //static int dp_max;
|
|
|
978 //static float surfacetime;
|
|
|
979 // _Bool first_stop = false;
|
|
|
980 float tissue_He_saturation[16];
|
|
|
981 float tissue_N2_saturation[16];
|
|
877
|
982 float vpm_buehlmann_safety_gradient = 1.0f - (((float)pDiveSettings->vpm_conservatism) / 40);
|
|
38
|
983 //max_first_stop_depth = fmaxf(first_stop_depth,max_first_stop_depth);
|
|
|
984
|
|
|
985 /** CALC DECO Ceiling ******************************************************************/
|
|
|
986 /** Not when Future stops */
|
|
|
987 if(vpm_calc_what == DECOSTOPS)
|
|
|
988 {
|
|
|
989
|
|
|
990 for (i = 1; i <= 16; ++i)
|
|
|
991 {
|
|
|
992 helium_pressure[i - 1] = he_pressure_start_of_deco_zone[i - 1];
|
|
|
993 nitrogen_pressure[i - 1] = n2_pressure_start_of_deco_zone[i - 1];
|
|
|
994 }
|
|
|
995 run_time = run_time_start_of_ascent;// run_time_start_of_ascent;
|
|
|
996 starting_depth = depth_change[0];
|
|
|
997 mix_number = mix_change[0];
|
|
|
998 rate = rate_change[0];
|
|
|
999 //gas_loadings_ascent_descen(helium_pressure,nitrogen_pressure, starting_depth, depth_start_of_deco_calc, rate, true);
|
|
|
1000
|
|
|
1001 float deco_ceiling_depth = 0.0f;
|
|
|
1002 if(depth_start_of_deco_calc > max_deco_ceiling_depth)
|
|
|
1003 {
|
|
|
1004 calc_deco_ceiling(&deco_ceiling_depth, true);
|
|
|
1005 }
|
|
|
1006 if(buehlmannSafety)
|
|
|
1007 {
|
|
|
1008 for (i = 0; i < 16; i++)
|
|
|
1009 {
|
|
863
|
1010 tissue_He_saturation[i] = helium_pressure[i] / 10.0;
|
|
|
1011 tissue_N2_saturation[i] = nitrogen_pressure[i] / 10.0;
|
|
38
|
1012 }
|
|
|
1013
|
|
|
1014 if(!decom_tissue_test_tolerance(tissue_N2_saturation, tissue_He_saturation, vpm_buehlmann_safety_gradient, (deco_ceiling_depth / 10.0f) + pInput->pressure_surface_bar))
|
|
|
1015 {
|
|
|
1016 vpm_violates_buehlmann = true;
|
|
|
1017 do {
|
|
|
1018 deco_ceiling_depth += 0.1f;
|
|
|
1019 } while (!decom_tissue_test_tolerance(tissue_N2_saturation, tissue_He_saturation, vpm_buehlmann_safety_gradient, (deco_ceiling_depth / 10.0f) + pInput->pressure_surface_bar));
|
|
|
1020 }
|
|
|
1021 }
|
|
|
1022
|
|
|
1023 if (deco_ceiling_depth < depth_start_of_deco_calc)
|
|
|
1024 {
|
|
|
1025 projected_ascent(&depth_start_of_deco_calc, &rate, &deco_ceiling_depth, &step_size);
|
|
|
1026 }
|
|
|
1027
|
|
|
1028 max_deco_ceiling_depth = fmaxf(max_deco_ceiling_depth,deco_ceiling_depth);
|
|
|
1029
|
|
|
1030 if(depth_start_of_deco_calc > deco_ceiling_depth)
|
|
|
1031 {
|
|
|
1032 gas_loadings_ascent_descen(helium_pressure,nitrogen_pressure, depth_start_of_deco_calc,deco_ceiling_depth, rate, true);
|
|
|
1033 //surfacetime += segment_time;
|
|
|
1034 }
|
|
|
1035
|
|
|
1036 if(vpm_b)
|
|
|
1037 {
|
|
|
1038 BOYLES_LAW_COMPENSATION(&max_deco_ceiling_depth, &deco_ceiling_depth, &step_size);
|
|
|
1039 }
|
|
|
1040 calc_deco_ceiling(&deco_ceiling_depth, false);
|
|
|
1041
|
|
|
1042 // buehlmann safety
|
|
|
1043 if(vpm_violates_buehlmann)
|
|
|
1044 {
|
|
|
1045 for (i = 0; i < 16; i++)
|
|
|
1046 {
|
|
863
|
1047 tissue_He_saturation[i] = helium_pressure[i] / 10.0;
|
|
|
1048 tissue_N2_saturation[i] = nitrogen_pressure[i] / 10.0;
|
|
38
|
1049 }
|
|
|
1050
|
|
|
1051 if(!decom_tissue_test_tolerance(tissue_N2_saturation, tissue_He_saturation, vpm_buehlmann_safety_gradient, (deco_ceiling_depth / 10.0f) + pInput->pressure_surface_bar))
|
|
|
1052 {
|
|
|
1053 vpm_violates_buehlmann = true;
|
|
|
1054 do {
|
|
|
1055 deco_ceiling_depth += 0.1f;
|
|
|
1056 } while (!decom_tissue_test_tolerance(tissue_N2_saturation, tissue_He_saturation, vpm_buehlmann_safety_gradient, (deco_ceiling_depth / 10.0f) + pInput->pressure_surface_bar));
|
|
|
1057 }
|
|
|
1058 }
|
|
|
1059 // output_ceiling_meter
|
|
|
1060 if(deco_ceiling_depth > first_stop_depth)
|
|
|
1061 deco_ceiling_depth = first_stop_depth;
|
|
|
1062 pDecoInfo->output_ceiling_meter = deco_ceiling_depth ;
|
|
|
1063 }
|
|
|
1064 else
|
|
|
1065 {
|
|
863
|
1066 pDecoInfo->output_ceiling_meter = 0.0;
|
|
38
|
1067 }
|
|
|
1068
|
|
|
1069 // fix hw 160627
|
|
863
|
1070 if(pDecoInfo->output_ceiling_meter < 0.0)
|
|
|
1071 pDecoInfo->output_ceiling_meter = 0.0;
|
|
38
|
1072
|
|
|
1073 /*** End CALC ceiling ***************************************************/
|
|
|
1074 }
|
|
|
1075
|
|
|
1076
|
|
|
1077 /* =============================================================================== */
|
|
|
1078 /* DECO STOP LOOP BLOCK FOR FINAL DECOMPRESSION SCHEDULE */
|
|
|
1079 /* =============================================================================== */
|
|
|
1080
|
|
290
|
1081 static int vpm_calc_final_deco(_Bool begin)
|
|
38
|
1082 {
|
|
|
1083 short i;
|
|
|
1084 float r1;
|
|
|
1085 float stop_time;
|
|
|
1086 int count = 0;
|
|
|
1087 static int dp_max;
|
|
|
1088 static float surfacetime;
|
|
|
1089 _Bool first_stop = false;
|
|
902
|
1090 float roundingValue = 0.0;
|
|
863
|
1091
|
|
902
|
1092 uint16_t stop_time_seconds;
|
|
863
|
1093
|
|
38
|
1094 max_first_stop_depth = fmaxf(first_stop_depth,max_first_stop_depth);
|
|
|
1095 if(begin)
|
|
|
1096 {
|
|
|
1097 gCNS_VPM = 0;
|
|
|
1098 dp_max = 0;
|
|
|
1099 for (i = 1; i <= 16; ++i)
|
|
|
1100 {
|
|
|
1101 helium_pressure[i - 1] =
|
|
|
1102 he_pressure_start_of_ascent[i - 1];
|
|
|
1103 nitrogen_pressure[i - 1] =
|
|
|
1104 n2_pressure_start_of_ascent[i - 1];
|
|
|
1105 }
|
|
|
1106 run_time = run_time_start_of_ascent;// run_time_start_of_ascent;
|
|
|
1107 starting_depth = depth_change[0];
|
|
|
1108 mix_number = mix_change[0];
|
|
|
1109 rate = rate_change[0];
|
|
|
1110 step_size = step_size_change[0];
|
|
|
1111 deco_stop_depth = first_stop_depth;
|
|
|
1112 max_first_stop_depth = fmaxf(first_stop_depth,max_first_stop_depth);
|
|
|
1113 last_run_time = 0.;
|
|
|
1114
|
|
|
1115
|
|
|
1116
|
|
|
1117 /* =============================================================================== */
|
|
|
1118 /* DECO STOP LOOP BLOCK FOR FINAL DECOMPRESSION SCHEDULE */
|
|
|
1119 /* =============================================================================== */
|
|
|
1120 surfacetime = 0;
|
|
|
1121 first_stop = true;
|
|
|
1122 }
|
|
|
1123
|
|
|
1124 while(true) /* loop will run continuous until there is an break statement */
|
|
|
1125 {
|
|
|
1126 if(starting_depth > deco_stop_depth)
|
|
|
1127 {
|
|
|
1128 gas_loadings_ascent_descen(helium_pressure,nitrogen_pressure, starting_depth,deco_stop_depth, rate, first_stop);
|
|
|
1129 surfacetime += segment_time;
|
|
|
1130 }
|
|
|
1131
|
|
|
1132 /* =============================================================================== */
|
|
|
1133 /* DURING FINAL DECOMPRESSION SCHEDULE PROCESS, COMPUTE MAXIMUM ACTUAL */
|
|
|
1134 /* SUPERSATURATION GRADIENT RESULTING IN EACH COMPARTMENT */
|
|
|
1135 /* If there is a repetitive dive, this will be used later in the VPM */
|
|
|
1136 /* Repetitive Algorithm to adjust the values for critical radii. */
|
|
|
1137 /* =============================================================================== */
|
|
|
1138 if(vpm_calc_what == DECOSTOPS)
|
|
|
1139 calc_max_actual_gradient(&deco_stop_depth);
|
|
|
1140
|
|
|
1141 if (deco_stop_depth <= 0.0f) {
|
|
|
1142 break;
|
|
|
1143 }
|
|
|
1144 if (number_of_changes > 1)
|
|
|
1145 {
|
|
|
1146 int i1 = number_of_changes;
|
|
|
1147 for (i = 2; i <= i1; ++i)
|
|
|
1148 {
|
|
|
1149 if (depth_change[i - 1] >= deco_stop_depth)
|
|
|
1150 {
|
|
|
1151 mix_number = mix_change[i - 1];
|
|
|
1152 rate = rate_change[i - 1];
|
|
|
1153 step_size = step_size_change[i - 1];
|
|
|
1154 }
|
|
|
1155 }
|
|
|
1156 }
|
|
|
1157
|
|
|
1158 if(first_stop)
|
|
|
1159 {
|
|
|
1160 run_time_first_stop = run_time;
|
|
|
1161 first_stop = false;
|
|
|
1162 }
|
|
|
1163 if(vpm_b)
|
|
|
1164 {
|
|
|
1165 BOYLES_LAW_COMPENSATION(&max_first_stop_depth, &deco_stop_depth, &step_size);
|
|
|
1166 }
|
|
|
1167 decompression_stop(&deco_stop_depth, &step_size, true);
|
|
|
1168
|
|
|
1169 /* =============================================================================== */
|
|
|
1170 /* This next bit justs rounds up the stop time at the first stop to be in */
|
|
|
1171 /* whole increments of the minimum stop time (to make for a nice deco table). */
|
|
|
1172 /* =============================================================================== */
|
|
|
1173
|
|
|
1174 if (last_run_time == 0.0f)
|
|
|
1175 {
|
|
|
1176 r1 = segment_time / minimum_deco_stop_time + 0.5f;
|
|
|
1177 stop_time = r_int(&r1) * minimum_deco_stop_time;
|
|
|
1178 } else {
|
|
|
1179 stop_time = run_time - last_run_time;
|
|
|
1180 }
|
|
|
1181 stop_time = segment_time;
|
|
|
1182 surfacetime += stop_time;
|
|
|
1183 if((vpm_calc_what == DECOSTOPS) || (vpm_calc_what == BAILOUTSTOPS))
|
|
|
1184 {
|
|
|
1185 int dp = 0;
|
|
|
1186 if(deco_stop_depth == (float)pDiveSettings->last_stop_depth_bar * 10)
|
|
|
1187 {
|
|
|
1188 dp = 0;
|
|
|
1189 }
|
|
|
1190 else
|
|
|
1191 {
|
|
902
|
1192 roundingValue = (deco_stop_depth - (pDiveSettings->input_second_to_last_stop_depth_bar * 10.0)) / step_size;
|
|
|
1193 dp = 1 + r_nint(&roundingValue);
|
|
38
|
1194 }
|
|
863
|
1195
|
|
|
1196 //dp_max = (int)fmaxf(dp_max,dp);
|
|
|
1197 if(dp > dp_max)
|
|
|
1198 {
|
|
|
1199 dp_max = dp;
|
|
|
1200 }
|
|
38
|
1201 if(dp < DECOINFO_STRUCT_MAX_STOPS)
|
|
|
1202 {
|
|
902
|
1203 stop_time_seconds = (uint16_t)(fminf((999.9 * 60.0), (stop_time *60.0)));
|
|
38
|
1204 //
|
|
|
1205
|
|
|
1206 //if(vpm_calc_what == DECOSTOPS)
|
|
863
|
1207 pDecoInfo->output_stop_length_seconds[dp] = stop_time_seconds;
|
|
38
|
1208 //else
|
|
|
1209 //decostop_bailout[dp] = (unsigned short)stop_time_seconds;
|
|
|
1210 }
|
|
|
1211 }
|
|
|
1212
|
|
|
1213
|
|
|
1214 /* =============================================================================== */
|
|
|
1215 /* DURING FINAL DECOMPRESSION SCHEDULE, IF MINIMUM STOP TIME PARAMETER IS A */
|
|
|
1216 /* WHOLE NUMBER (i.e. 1 minute) THEN WRITE DECO SCHEDULE USING short */
|
|
|
1217 /* NUMBERS (looks nicer). OTHERWISE, USE DECIMAL NUMBERS. */
|
|
|
1218 /* Note: per the request of a noted exploration diver(!), program now allows */
|
|
|
1219 /* a minimum stop time of less than one minute so that total ascent time can */
|
|
|
1220 /* be minimized on very long dives. In fact, with step size set at 1 fsw or */
|
|
|
1221 /* 0.2 msw and minimum stop time set at 0.1 minute (6 seconds), a near */
|
|
|
1222 /* continuous decompression schedule can be computed. */
|
|
|
1223 /* =============================================================================== */
|
|
|
1224
|
|
|
1225 starting_depth = deco_stop_depth;
|
|
877
|
1226 if(deco_stop_depth == (float)pDiveSettings->last_stop_depth_bar * 10)
|
|
|
1227 deco_stop_depth = 0;
|
|
38
|
1228 else
|
|
|
1229 {
|
|
|
1230 deco_stop_depth = deco_stop_depth - step_size;
|
|
877
|
1231 deco_stop_depth = fmaxf(deco_stop_depth,(float)pDiveSettings->last_stop_depth_bar * 10);
|
|
38
|
1232 }
|
|
|
1233
|
|
|
1234 last_run_time = run_time;
|
|
|
1235 count++;
|
|
|
1236 //if(count > 14)
|
|
|
1237 //return CALC_FINAL_DECO2;
|
|
|
1238 /* L80: */
|
|
|
1239 } /* for final deco sche */
|
|
|
1240
|
|
|
1241 if( (vpm_calc_what == DECOSTOPS) || (vpm_calc_what == BAILOUTSTOPS))
|
|
|
1242 {
|
|
|
1243 for(int dp = dp_max +1;dp < DECOINFO_STRUCT_MAX_STOPS;dp++)
|
|
|
1244 {
|
|
|
1245 //if(vpm_calc_what == DECOSTOPS)
|
|
|
1246 pDecoInfo->output_stop_length_seconds[dp] = 0;
|
|
|
1247 //else
|
|
|
1248 //decostop_bailout[dp] = 0;
|
|
|
1249 }
|
|
|
1250 }
|
|
863
|
1251 pDecoInfo->output_time_to_surface_seconds = (int)(surfacetime * 60.0);
|
|
38
|
1252 pDecoInfo->output_ndl_seconds = 0;
|
|
|
1253
|
|
|
1254 vpm_calc_deco_ceiling();
|
|
|
1255 /* end of deco stop lo */
|
|
|
1256 return CALC_END;
|
|
|
1257 }
|
|
|
1258
|
|
|
1259 /* =============================================================================== */
|
|
|
1260 /* SUBROUTINE NUCLEAR_REGENERATION */
|
|
|
1261 /* Purpose: This subprogram calculates the regeneration of VPM critical */
|
|
|
1262 /* radii that takes place over the dive time. The regeneration time constant */
|
|
|
1263 /* has a time scale of weeks so this will have very little impact on dives of */
|
|
|
1264 /* normal length, but will have a major impact for saturation dives. */
|
|
|
1265 /* =============================================================================== */
|
|
|
1266
|
|
290
|
1267 static int nuclear_regeneration(float *dive_time)
|
|
38
|
1268 {
|
|
|
1269 /* Local variables */
|
|
|
1270 float crush_pressure_adjust_ratio_he,
|
|
|
1271 ending_radius_n2,
|
|
|
1272 ending_radius_he;
|
|
|
1273 short i;
|
|
|
1274 float crushing_pressure_pascals_n2,
|
|
|
1275 crushing_pressure_pascals_he,
|
|
|
1276 adj_crush_pressure_n2_pascals,
|
|
|
1277 adj_crush_pressure_he_pascals,
|
|
|
1278 crush_pressure_adjust_ratio_n2;
|
|
|
1279
|
|
|
1280 /* loop */
|
|
|
1281 /* =============================================================================== */
|
|
|
1282 /* CALCULATIONS */
|
|
|
1283 /* First convert the maximum crushing pressure obtained for each compartment */
|
|
|
1284 /* to Pascals. Next, compute the ending radius for helium and nitrogen */
|
|
|
1285 /* critical nuclei in each compartment. */
|
|
|
1286 /* =============================================================================== */
|
|
|
1287
|
|
|
1288 for (i = 1; i <= 16; ++i)
|
|
|
1289 {
|
|
|
1290 crushing_pressure_pascals_he =
|
|
|
1291 pVpm->max_crushing_pressure_he[i - 1] / UNITS_FACTOR * 101325.0f;
|
|
|
1292 crushing_pressure_pascals_n2 =
|
|
|
1293 pVpm->max_crushing_pressure_n2[i - 1] / UNITS_FACTOR * 101325.0f;
|
|
|
1294 ending_radius_he =
|
|
|
1295 1.0f / (crushing_pressure_pascals_he /
|
|
|
1296 ((SKIN_COMPRESSION_GAMMAC - SURFACE_TENSION_GAMMA) * 2.0f) +
|
|
|
1297 1.0f / pVpm->adjusted_critical_radius_he[i - 1]);
|
|
|
1298 ending_radius_n2 =
|
|
|
1299 1.0f / (crushing_pressure_pascals_n2 /
|
|
|
1300 ((SKIN_COMPRESSION_GAMMAC - SURFACE_TENSION_GAMMA) * 2.0f) +
|
|
|
1301 1.0f / pVpm->adjusted_critical_radius_n2[i - 1]);
|
|
|
1302
|
|
|
1303 /* =============================================================================== */
|
|
|
1304 /* A "regenerated" radius for each nucleus is now calculated based on the */
|
|
|
1305 /* regeneration time constant. This means that after application of */
|
|
|
1306 /* crushing pressure and reduction in radius, a nucleus will slowly grow */
|
|
|
1307 /* back to its original initial radius over a period of time. This */
|
|
|
1308 /* phenomenon is probabilistic in nature and depends on absolute temperature. */
|
|
|
1309 /* It is independent of crushing pressure. */
|
|
|
1310 /* =============================================================================== */
|
|
|
1311
|
|
|
1312 regenerated_radius_he[i - 1] =
|
|
|
1313 pVpm->adjusted_critical_radius_he[i - 1] +
|
|
|
1314 (ending_radius_he - pVpm->adjusted_critical_radius_he[i - 1]) *
|
|
|
1315 expf(-(*dive_time) / REGENERATION_TIME_CONSTANT);
|
|
|
1316 regenerated_radius_n2[i - 1] =
|
|
|
1317 pVpm->adjusted_critical_radius_n2[i - 1] +
|
|
|
1318 (ending_radius_n2 - pVpm->adjusted_critical_radius_n2[i - 1]) *
|
|
|
1319 expf(-(*dive_time) / REGENERATION_TIME_CONSTANT);
|
|
|
1320
|
|
|
1321 /* =============================================================================== */
|
|
|
1322 /* In order to preserve reference back to the initial critical radii after */
|
|
|
1323 /* regeneration, an "adjusted crushing pressure" for the nuclei in each */
|
|
|
1324 /* compartment must be computed. In other words, this is the value of */
|
|
|
1325 /* crushing pressure that would have reduced the original nucleus to the */
|
|
|
1326 /* to the present radius had regeneration not taken place. The ratio */
|
|
|
1327 /* for adjusting crushing pressure is obtained from algebraic manipulation */
|
|
|
1328 /* of the standard VPM equations. The adjusted crushing pressure, in lieu */
|
|
|
1329 /* of the original crushing pressure, is then applied in the VPM Critical */
|
|
|
1330 /* Volume Algorithm and the VPM Repetitive Algorithm. */
|
|
|
1331 /* =============================================================================== */
|
|
|
1332
|
|
|
1333 crush_pressure_adjust_ratio_he =
|
|
|
1334 ending_radius_he * (pVpm->adjusted_critical_radius_he[i - 1] -
|
|
|
1335 regenerated_radius_he[i - 1]) /
|
|
|
1336 (regenerated_radius_he[i - 1] *
|
|
|
1337 (pVpm->adjusted_critical_radius_he[i - 1] -
|
|
|
1338 ending_radius_he));
|
|
|
1339 crush_pressure_adjust_ratio_n2 =
|
|
|
1340 ending_radius_n2 * (pVpm->adjusted_critical_radius_n2[i - 1] -
|
|
|
1341 regenerated_radius_n2[i - 1]) /
|
|
|
1342 (regenerated_radius_n2[i - 1] *
|
|
|
1343 (pVpm->adjusted_critical_radius_n2[i - 1] -
|
|
|
1344 ending_radius_n2));
|
|
|
1345 adj_crush_pressure_he_pascals =
|
|
|
1346 crushing_pressure_pascals_he * crush_pressure_adjust_ratio_he;
|
|
|
1347 adj_crush_pressure_n2_pascals =
|
|
|
1348 crushing_pressure_pascals_n2 * crush_pressure_adjust_ratio_n2;
|
|
|
1349 pVpm->adjusted_crushing_pressure_he[i - 1] =
|
|
|
1350 adj_crush_pressure_he_pascals / 101325.0f * UNITS_FACTOR;
|
|
|
1351 pVpm->adjusted_crushing_pressure_n2[i - 1] =
|
|
|
1352 adj_crush_pressure_n2_pascals / 101325.0f * UNITS_FACTOR;
|
|
|
1353 }
|
|
|
1354 return 0;
|
|
|
1355 } /* nuclear_regeneration */
|
|
|
1356
|
|
|
1357 /* =============================================================================== */
|
|
|
1358 /* SUBROUTINE CALC_INITIAL_ALLOWABLE_GRADIENT */
|
|
|
1359 /* Purpose: This subprogram calculates the initial allowable gradients for */
|
|
|
1360 /* helium and nitrogren in each compartment. These are the gradients that */
|
|
|
1361 /* will be used to set the deco ceiling on the first pass through the deco */
|
|
|
1362 /* loop. If the Critical Volume Algorithm is set to "off", then these */
|
|
|
1363 /* gradients will determine the final deco schedule. Otherwise, if the */
|
|
|
1364 /* Critical Volume Algorithm is set to "on", these gradients will be further */
|
|
|
1365 /* "relaxed" by the Critical Volume Algorithm subroutine. The initial */
|
|
|
1366 /* allowable gradients are referred to as "PssMin" in the papers by Yount */
|
|
|
1367 /* and colleauges, i.e., the minimum supersaturation pressure gradients */
|
|
|
1368 /* that will probe bubble formation in the VPM nuclei that started with the */
|
|
|
1369 /* designated minimum initial radius (critical radius). */
|
|
|
1370
|
|
|
1371 /* The initial allowable gradients are computed directly from the */
|
|
|
1372 /* "regenerated" radii after the Nuclear Regeneration subroutine. These */
|
|
|
1373 /* gradients are tracked separately for helium and nitrogen. */
|
|
|
1374 /* =============================================================================== */
|
|
|
1375
|
|
290
|
1376 static int calc_initial_allowable_gradient()
|
|
38
|
1377 {
|
|
|
1378 float initial_allowable_grad_n2_pa,
|
|
|
1379 initial_allowable_grad_he_pa;
|
|
|
1380 short i;
|
|
|
1381
|
|
|
1382 /* loop */
|
|
|
1383 /* =============================================================================== */
|
|
|
1384 /* CALCULATIONS */
|
|
|
1385 /* The initial allowable gradients are computed in Pascals and then converted */
|
|
|
1386 /* to the diving pressure units. Two different sets of arrays are used to */
|
|
|
1387 /* save the calculations - Initial Allowable Gradients and Allowable */
|
|
|
1388 /* Gradients. The Allowable Gradients are assigned the values from Initial */
|
|
|
1389 /* Allowable Gradients however the Allowable Gradients can be changed later */
|
|
|
1390 /* by the Critical Volume subroutine. The values for the Initial Allowable */
|
|
|
1391 /* Gradients are saved in a global array for later use by both the Critical */
|
|
|
1392 /* Volume subroutine and the VPM Repetitive Algorithm subroutine. */
|
|
|
1393 /* =============================================================================== */
|
|
|
1394
|
|
|
1395 for (i = 1; i <= 16; ++i)
|
|
|
1396 {
|
|
|
1397 initial_allowable_grad_n2_pa =
|
|
|
1398 SURFACE_TENSION_GAMMA * 2.0f *
|
|
|
1399 (SKIN_COMPRESSION_GAMMAC - SURFACE_TENSION_GAMMA) /
|
|
|
1400 (regenerated_radius_n2[i - 1] * SKIN_COMPRESSION_GAMMAC);
|
|
|
1401
|
|
|
1402 initial_allowable_grad_he_pa =
|
|
|
1403 SURFACE_TENSION_GAMMA * 2.0f *
|
|
|
1404 (SKIN_COMPRESSION_GAMMAC - SURFACE_TENSION_GAMMA) /
|
|
|
1405 (regenerated_radius_he[i - 1] * SKIN_COMPRESSION_GAMMAC);
|
|
|
1406
|
|
|
1407 pVpm->initial_allowable_gradient_n2[i - 1] =
|
|
|
1408 initial_allowable_grad_n2_pa / 101325.0f * UNITS_FACTOR;
|
|
|
1409
|
|
|
1410 pVpm->initial_allowable_gradient_he[i - 1] =
|
|
|
1411 initial_allowable_grad_he_pa / 101325.0f * UNITS_FACTOR;
|
|
|
1412
|
|
|
1413 allowable_gradient_he[i - 1] =
|
|
|
1414 pVpm->initial_allowable_gradient_he[i - 1];
|
|
|
1415
|
|
|
1416 allowable_gradient_n2[i - 1] =
|
|
|
1417 pVpm->initial_allowable_gradient_n2[i - 1];
|
|
|
1418 }
|
|
|
1419 return 0;
|
|
|
1420 } /* calc_initial_allowable_gradient */
|
|
|
1421
|
|
|
1422 /* =============================================================================== */
|
|
|
1423 /* SUBROUTINE CALC_DECO_CEILING */
|
|
|
1424 /* Purpose: This subprogram calculates the deco ceiling (the safe ascent */
|
|
|
1425 /* depth) in each compartment, based on the allowable gradients, and then */
|
|
|
1426 /* finds the deepest deco ceiling across all compartments. This deepest */
|
|
|
1427 /* value (Deco Ceiling Depth) is then used by the Decompression Stop */
|
|
|
1428 /* subroutine to determine the actual deco schedule. */
|
|
|
1429 /* =============================================================================== */
|
|
|
1430
|
|
290
|
1431 static int calc_deco_ceiling(float *deco_ceiling_depth,_Bool fallowable)
|
|
38
|
1432 {
|
|
|
1433 /* System generated locals */
|
|
|
1434 float r1, r2;
|
|
|
1435 /* Local variables */
|
|
|
1436 float weighted_allowable_gradient;
|
|
|
1437 short i;
|
|
|
1438 float compartment_deco_ceiling[16],
|
|
|
1439 gas_loading,
|
|
|
1440 tolerated_ambient_pressure;
|
|
|
1441 float gradient_he, gradient_n2;
|
|
|
1442
|
|
|
1443 if(!vpm_b)
|
|
|
1444 fallowable = true;
|
|
|
1445 /* loop */
|
|
|
1446 /* =============================================================================== */
|
|
|
1447 /* CALCULATIONS */
|
|
|
1448 /* Since there are two sets of allowable gradients being tracked, one for */
|
|
|
1449 /* helium and one for nitrogen, a "weighted allowable gradient" must be */
|
|
|
1450 /* computed each time based on the proportions of helium and nitrogen in */
|
|
|
1451 /* each compartment. This proportioning follows the methodology of */
|
|
|
1452 /* Buhlmann/Keller. If there is no helium and nitrogen in the compartment, */
|
|
|
1453 /* such as after extended periods of oxygen breathing, then the minimum value */
|
|
|
1454 /* across both gases will be used. It is important to note that if a */
|
|
|
1455 /* compartment is empty of helium and nitrogen, then the weighted allowable */
|
|
|
1456 /* gradient formula cannot be used since it will result in division by zero. */
|
|
|
1457 /* =============================================================================== */
|
|
|
1458
|
|
|
1459 for (i = 1; i <= 16; ++i)
|
|
|
1460 {
|
|
|
1461
|
|
|
1462 // abfrage raus und pointer stattdessen
|
|
|
1463 if(fallowable){
|
|
|
1464 gradient_he = allowable_gradient_he[i-1];
|
|
|
1465 gradient_n2 = allowable_gradient_n2[i-1];
|
|
|
1466 }
|
|
|
1467 else{
|
|
|
1468 gradient_he = deco_gradient_he[i-1];
|
|
|
1469 gradient_n2 = deco_gradient_n2[i-1];
|
|
|
1470 }
|
|
|
1471
|
|
|
1472 gas_loading = helium_pressure[i - 1] + nitrogen_pressure[i - 1];
|
|
|
1473
|
|
|
1474 if (gas_loading > 0)
|
|
|
1475 {
|
|
|
1476 weighted_allowable_gradient =
|
|
|
1477 (gradient_he * helium_pressure[i - 1] +
|
|
|
1478 gradient_n2 * nitrogen_pressure[i - 1]) /
|
|
|
1479 (helium_pressure[i - 1] + nitrogen_pressure[i - 1]);
|
|
|
1480
|
|
|
1481 tolerated_ambient_pressure =
|
|
|
1482 gas_loading +
|
|
|
1483 CONSTANT_PRESSURE_OTHER_GASES -
|
|
|
1484 weighted_allowable_gradient;
|
|
|
1485 }
|
|
|
1486 else
|
|
|
1487 {
|
|
|
1488 /* Computing MIN */
|
|
|
1489 r1 = gradient_he;
|
|
|
1490 r2 = gradient_n2;
|
|
|
1491 weighted_allowable_gradient = fminf(r1,r2);
|
|
|
1492
|
|
|
1493 tolerated_ambient_pressure =
|
|
|
1494 CONSTANT_PRESSURE_OTHER_GASES - weighted_allowable_gradient;
|
|
|
1495 }
|
|
|
1496
|
|
|
1497 /* =============================================================================== */
|
|
|
1498 /* The tolerated ambient pressure cannot be less than zero absolute, i.e., */
|
|
|
1499 /* the vacuum of outer space! */
|
|
|
1500 /* =============================================================================== */
|
|
|
1501
|
|
863
|
1502 if (tolerated_ambient_pressure < 0.0) {
|
|
|
1503 tolerated_ambient_pressure = 0.0;
|
|
38
|
1504 }
|
|
|
1505 compartment_deco_ceiling[i - 1] =
|
|
|
1506 tolerated_ambient_pressure - barometric_pressure;
|
|
|
1507 }
|
|
|
1508
|
|
|
1509 /* =============================================================================== */
|
|
|
1510 /* The Deco Ceiling Depth is computed in a loop after all of the individual */
|
|
|
1511 /* compartment deco ceilings have been calculated. It is important that the */
|
|
|
1512 /* Deco Ceiling Depth (max deco ceiling across all compartments) only be */
|
|
|
1513 /* extracted from the compartment values and not be compared against some */
|
|
|
1514 /* initialization value. For example, if MAX(Deco_Ceiling_Depth . .) was */
|
|
|
1515 /* compared against zero, this could cause a program lockup because sometimes */
|
|
|
1516 /* the Deco Ceiling Depth needs to be negative (but not less than zero */
|
|
|
1517 /* absolute ambient pressure) in order to decompress to the last stop at zero */
|
|
|
1518 /* depth. */
|
|
|
1519 /* =============================================================================== */
|
|
|
1520
|
|
|
1521 *deco_ceiling_depth = compartment_deco_ceiling[0];
|
|
|
1522 for (i = 2; i <= 16; ++i)
|
|
|
1523 {
|
|
|
1524 /* Computing MAX */
|
|
|
1525 r1 = *deco_ceiling_depth;
|
|
|
1526 r2 = compartment_deco_ceiling[i - 1];
|
|
|
1527 *deco_ceiling_depth = fmaxf(r1,r2);
|
|
|
1528 }
|
|
|
1529 return 0;
|
|
|
1530 } /* calc_deco_ceiling */
|
|
|
1531
|
|
|
1532
|
|
|
1533
|
|
|
1534 /* =============================================================================== */
|
|
|
1535 /* SUBROUTINE CALC_MAX_ACTUAL_GRADIENT */
|
|
|
1536 /* Purpose: This subprogram calculates the actual supersaturation gradient */
|
|
|
1537 /* obtained in each compartment as a result of the ascent profile during */
|
|
|
1538 /* decompression. Similar to the concept with crushing pressure, the */
|
|
|
1539 /* supersaturation gradients are not cumulative over a multi-level, staged */
|
|
|
1540 /* ascent. Rather, it will be the maximum value obtained in any one discrete */
|
|
|
1541 /* step of the overall ascent. Thus, the program must compute and store the */
|
|
|
1542 /* maximum actual gradient for each compartment that was obtained across all */
|
|
|
1543 /* steps of the ascent profile. This subroutine is invoked on the last pass */
|
|
|
1544 /* through the deco stop loop block when the final deco schedule is being */
|
|
|
1545 /* generated. */
|
|
|
1546 /* */
|
|
|
1547 /* The max actual gradients are later used by the VPM Repetitive Algorithm to */
|
|
|
1548 /* determine if adjustments to the critical radii are required. If the max */
|
|
|
1549 /* actual gradient did not exceed the initial alllowable gradient, then no */
|
|
|
1550 /* adjustment will be made. However, if the max actual gradient did exceed */
|
|
|
1551 /* the intitial allowable gradient, such as permitted by the Critical Volume */
|
|
|
1552 /* Algorithm, then the critical radius will be adjusted (made larger) on the */
|
|
|
1553 /* repetitive dive to compensate for the bubbling that was allowed on the */
|
|
|
1554 /* previous dive. The use of the max actual gradients is intended to prevent */
|
|
|
1555 /* the repetitive algorithm from being overly conservative. */
|
|
|
1556 /* =============================================================================== */
|
|
|
1557
|
|
290
|
1558 static int calc_max_actual_gradient(float *deco_stop_depth)
|
|
38
|
1559 {
|
|
|
1560 /* System generated locals */
|
|
|
1561 float r1;
|
|
|
1562
|
|
|
1563 /* Local variables */
|
|
|
1564 short i;
|
|
|
1565 float compartment_gradient;
|
|
|
1566
|
|
|
1567 /* loop */
|
|
|
1568 /* =============================================================================== */
|
|
|
1569 /* CALCULATIONS */
|
|
|
1570 /* Note: negative supersaturation gradients are meaningless for this */
|
|
|
1571 /* application, so the values must be equal to or greater than zero. */
|
|
|
1572 /* =============================================================================== */
|
|
|
1573
|
|
|
1574 for (i = 1; i <= 16; ++i)
|
|
|
1575 {
|
|
|
1576 compartment_gradient =
|
|
|
1577 helium_pressure[i - 1] +
|
|
|
1578 nitrogen_pressure[i - 1] +
|
|
|
1579 CONSTANT_PRESSURE_OTHER_GASES -
|
|
|
1580 (*deco_stop_depth + barometric_pressure);
|
|
|
1581 if (compartment_gradient <= 0.0f) {
|
|
|
1582 compartment_gradient = 0.0f;
|
|
|
1583 }
|
|
|
1584 /* Computing MAX */
|
|
|
1585 r1 = pVpm->max_actual_gradient[i - 1];
|
|
|
1586 pVpm->max_actual_gradient[i - 1] = fmaxf(r1, compartment_gradient);
|
|
|
1587 }
|
|
|
1588 return 0;
|
|
|
1589 } /* calc_max_actual_gradient */
|
|
|
1590
|
|
|
1591 /* =============================================================================== */
|
|
|
1592 /* SUBROUTINE CALC_SURFACE_PHASE_VOLUME_TIME */
|
|
|
1593 /* Purpose: This subprogram computes the surface portion of the total phase */
|
|
|
1594 /* volume time. This is the time factored out of the integration of */
|
|
|
1595 /* supersaturation gradient x time over the surface interval. The VPM */
|
|
|
1596 /* considers the gradients that allow bubbles to form or to drive bubble */
|
|
|
1597 /* growth both in the water and on the surface after the dive. */
|
|
|
1598
|
|
|
1599 /* This subroutine is a new development to the VPM algorithm in that it */
|
|
|
1600 /* computes the time course of supersaturation gradients on the surface */
|
|
|
1601 /* when both helium and nitrogen are present. Refer to separate write-up */
|
|
|
1602 /* for a more detailed explanation of this algorithm. */
|
|
|
1603 /* =============================================================================== */
|
|
|
1604
|
|
290
|
1605 static int calc_surface_phase_volume_time()
|
|
38
|
1606 {
|
|
|
1607 /* Local variables */
|
|
|
1608 float decay_time_to_zero_gradient;
|
|
|
1609 short i;
|
|
|
1610 float integral_gradient_x_time,
|
|
|
1611 surface_inspired_n2_pressure;
|
|
|
1612
|
|
|
1613 /* loop */
|
|
|
1614 /* =============================================================================== */
|
|
|
1615 /* CALCULATIONS */
|
|
|
1616 /* =============================================================================== */
|
|
|
1617
|
|
|
1618 surface_inspired_n2_pressure =
|
|
|
1619 (barometric_pressure - WATER_VAPOR_PRESSURE) * 0.79f;
|
|
|
1620 for (i = 1; i <= 16; ++i)
|
|
|
1621 {
|
|
|
1622 if (nitrogen_pressure[i - 1] > surface_inspired_n2_pressure)
|
|
|
1623 {
|
|
|
1624 surface_phase_volume_time[i - 1] =
|
|
|
1625 (helium_pressure[i - 1] / HELIUM_TIME_CONSTANT[i - 1] +
|
|
|
1626 (nitrogen_pressure[i - 1] - surface_inspired_n2_pressure) /
|
|
|
1627 NITROGEN_TIME_CONSTANT[i - 1]) /
|
|
|
1628 (helium_pressure[i - 1] + nitrogen_pressure[i - 1] -
|
|
|
1629 surface_inspired_n2_pressure);
|
|
|
1630 } else if (nitrogen_pressure[i - 1] <= surface_inspired_n2_pressure &&
|
|
|
1631 helium_pressure[i - 1] + nitrogen_pressure[i - 1] >= surface_inspired_n2_pressure)
|
|
|
1632 {
|
|
|
1633 decay_time_to_zero_gradient =
|
|
|
1634 1.0f / (NITROGEN_TIME_CONSTANT[i - 1] - HELIUM_TIME_CONSTANT[i - 1]) *
|
|
|
1635 log((surface_inspired_n2_pressure - nitrogen_pressure[i - 1]) /
|
|
|
1636 helium_pressure[i - 1]);
|
|
|
1637 integral_gradient_x_time =
|
|
|
1638 helium_pressure[i - 1] /
|
|
|
1639 HELIUM_TIME_CONSTANT[i - 1] *
|
|
|
1640 (1.0f - expf(-HELIUM_TIME_CONSTANT[i - 1] *
|
|
|
1641 decay_time_to_zero_gradient)) +
|
|
|
1642 (nitrogen_pressure[i - 1] - surface_inspired_n2_pressure) /
|
|
|
1643 NITROGEN_TIME_CONSTANT[i - 1] *
|
|
|
1644 (1.0f - expf(-NITROGEN_TIME_CONSTANT[i - 1] *
|
|
|
1645 decay_time_to_zero_gradient));
|
|
|
1646 surface_phase_volume_time[i - 1] =
|
|
|
1647 integral_gradient_x_time /
|
|
|
1648 (helium_pressure[i - 1] +
|
|
|
1649 nitrogen_pressure[i - 1] -
|
|
|
1650 surface_inspired_n2_pressure);
|
|
|
1651 } else {
|
|
|
1652 surface_phase_volume_time[i - 1] = 0.0f;
|
|
|
1653 }
|
|
|
1654 }
|
|
|
1655 return 0;
|
|
|
1656 } /* calc_surface_phase_volume_time */
|
|
|
1657
|
|
|
1658 /* =============================================================================== */
|
|
|
1659 /* SUBROUTINE CRITICAL_VOLUME */
|
|
|
1660 /* Purpose: This subprogram applies the VPM Critical Volume Algorithm. This */
|
|
|
1661 /* algorithm will compute "relaxed" gradients for helium and nitrogen based */
|
|
|
1662 /* on the setting of the Critical Volume Parameter Lambda. */
|
|
|
1663 /* =============================================================================== */
|
|
|
1664
|
|
290
|
1665 static int critical_volume(float *deco_phase_volume_time)
|
|
38
|
1666 {
|
|
|
1667 /* System generated locals */
|
|
|
1668 float r1;
|
|
|
1669
|
|
|
1670 /* Local variables */
|
|
|
1671 float initial_allowable_grad_n2_pa,
|
|
|
1672 initial_allowable_grad_he_pa,
|
|
|
1673 parameter_lambda_pascals, b,
|
|
|
1674 c;
|
|
|
1675 short i;
|
|
|
1676 float new_allowable_grad_n2_pascals,
|
|
|
1677 phase_volume_time[16],
|
|
|
1678 new_allowable_grad_he_pascals,
|
|
|
1679 adj_crush_pressure_n2_pascals,
|
|
|
1680 adj_crush_pressure_he_pascals;
|
|
|
1681
|
|
|
1682 /* loop */
|
|
|
1683 /* =============================================================================== */
|
|
|
1684 /* CALCULATIONS */
|
|
|
1685 /* Note: Since the Critical Volume Parameter Lambda was defined in units of */
|
|
|
1686 /* fsw-min in the original papers by Yount and colleauges, the same */
|
|
|
1687 /* convention is retained here. Although Lambda is adjustable only in units */
|
|
|
1688 /* of fsw-min in the program settings (range from 6500 to 8300 with default */
|
|
|
1689 /* 7500), it will convert to the proper value in Pascals-min in this */
|
|
|
1690 /* subroutine regardless of which diving pressure units are being used in */
|
|
|
1691 /* the main program - feet of seawater (fsw) or meters of seawater (msw). */
|
|
|
1692 /* The allowable gradient is computed using the quadratic formula (refer to */
|
|
|
1693 /* separate write-up posted on the Deco List web site). */
|
|
|
1694 /* =============================================================================== */
|
|
|
1695
|
|
|
1696 /**
|
|
|
1697 ******************************************************************************
|
|
|
1698 * @brief critical_volume comment by hw
|
|
|
1699 * @version V0.0.1
|
|
|
1700 * @date 19-April-2014
|
|
|
1701 * @retval global: allowable_gradient_he[i], allowable_gradient_n2[i]
|
|
|
1702 ******************************************************************************
|
|
|
1703 */
|
|
|
1704
|
|
|
1705 parameter_lambda_pascals =
|
|
|
1706 CRIT_VOLUME_PARAMETER_LAMBDA / 33.0f * 101325.0f;
|
|
|
1707 for (i = 1; i <= 16; ++i)
|
|
|
1708 {
|
|
|
1709 phase_volume_time[i - 1] =
|
|
|
1710 *deco_phase_volume_time + surface_phase_volume_time[i - 1];
|
|
|
1711 }
|
|
|
1712 for (i = 1; i <= 16; ++i)
|
|
|
1713 {
|
|
|
1714
|
|
|
1715 adj_crush_pressure_he_pascals =
|
|
|
1716 pVpm->adjusted_crushing_pressure_he[i - 1] / UNITS_FACTOR * 101325.0f;
|
|
|
1717
|
|
|
1718 initial_allowable_grad_he_pa =
|
|
|
1719 pVpm->initial_allowable_gradient_he[i - 1] / UNITS_FACTOR * 101325.0f;
|
|
|
1720
|
|
|
1721 b = initial_allowable_grad_he_pa + parameter_lambda_pascals *
|
|
|
1722 SURFACE_TENSION_GAMMA / (
|
|
|
1723 SKIN_COMPRESSION_GAMMAC * phase_volume_time[i - 1]);
|
|
|
1724
|
|
|
1725 c = SURFACE_TENSION_GAMMA * (
|
|
|
1726 SURFACE_TENSION_GAMMA * (
|
|
|
1727 parameter_lambda_pascals * adj_crush_pressure_he_pascals)) /
|
|
|
1728 (SKIN_COMPRESSION_GAMMAC *
|
|
|
1729 (SKIN_COMPRESSION_GAMMAC * phase_volume_time[i - 1]));
|
|
|
1730 /* Computing 2nd power */
|
|
|
1731
|
|
|
1732 r1 = b;
|
|
|
1733
|
|
|
1734 new_allowable_grad_he_pascals =
|
|
|
1735 (b + sqrtf(r1 * r1 - c * 4.0f)) / 2.0f;
|
|
|
1736
|
|
|
1737 /* modify global variable */
|
|
|
1738 allowable_gradient_he[i - 1] =
|
|
|
1739 new_allowable_grad_he_pascals / 101325.0f * UNITS_FACTOR;
|
|
|
1740 }
|
|
|
1741
|
|
|
1742 for (i = 1; i <= 16; ++i)
|
|
|
1743 {
|
|
|
1744 adj_crush_pressure_n2_pascals =
|
|
|
1745 pVpm->adjusted_crushing_pressure_n2[i - 1] / UNITS_FACTOR * 101325.0f;
|
|
|
1746
|
|
|
1747 initial_allowable_grad_n2_pa =
|
|
|
1748 pVpm->initial_allowable_gradient_n2[i - 1] / UNITS_FACTOR * 101325.0f;
|
|
|
1749
|
|
|
1750 b = initial_allowable_grad_n2_pa + parameter_lambda_pascals *
|
|
|
1751 SURFACE_TENSION_GAMMA / (
|
|
|
1752 SKIN_COMPRESSION_GAMMAC * phase_volume_time[i - 1]);
|
|
|
1753
|
|
|
1754 c = SURFACE_TENSION_GAMMA *
|
|
|
1755 (SURFACE_TENSION_GAMMA *
|
|
|
1756 (parameter_lambda_pascals * adj_crush_pressure_n2_pascals)) /
|
|
|
1757 (SKIN_COMPRESSION_GAMMAC *
|
|
|
1758 (SKIN_COMPRESSION_GAMMAC * phase_volume_time[i - 1]));
|
|
|
1759 /* Computing 2nd power */
|
|
|
1760
|
|
|
1761 r1 = b;
|
|
|
1762
|
|
|
1763 new_allowable_grad_n2_pascals =
|
|
|
1764 (b + sqrtf(r1 * r1 - c * 4.0f)) / 2.0f;
|
|
|
1765
|
|
|
1766 /* modify global variable */
|
|
|
1767 allowable_gradient_n2[i - 1] =
|
|
|
1768 new_allowable_grad_n2_pascals / 101325.0f * UNITS_FACTOR;
|
|
|
1769 }
|
|
|
1770 return 0;
|
|
|
1771 } /* critical_volume */
|
|
|
1772
|
|
|
1773 /* =============================================================================== */
|
|
|
1774 /* SUBROUTINE CALC_START_OF_DECO_ZONE */
|
|
|
1775 /* Purpose: This subroutine uses the Bisection Method to find the depth at */
|
|
|
1776 /* which the leading compartment just enters the decompression zone. */
|
|
|
1777 /* Source: "Numerical Recipes in Fortran 77", Cambridge University Press, */
|
|
|
1778 /* 1992. */
|
|
|
1779 /* =============================================================================== */
|
|
|
1780
|
|
290
|
1781 static int calc_start_of_deco_zone(float *starting_depth,
|
|
38
|
1782 float *rate,
|
|
|
1783 float *depth_start_of_deco_zone)
|
|
|
1784 {
|
|
|
1785 /* Local variables */
|
|
|
1786 float last_diff_change,
|
|
|
1787 initial_helium_pressure,
|
|
|
1788 mid_range_nitrogen_pressure;
|
|
|
1789 short i, j;
|
|
|
1790 float initial_inspired_n2_pressure,
|
|
|
1791 cpt_depth_start_of_deco_zone,
|
|
|
1792 low_bound,
|
|
|
1793 initial_inspired_he_pressure,
|
|
|
1794 high_bound_nitrogen_pressure,
|
|
|
1795 nitrogen_rate,
|
|
|
1796 function_at_mid_range,
|
|
|
1797 function_at_low_bound,
|
|
|
1798 high_bound,
|
|
|
1799 mid_range_helium_pressure,
|
|
|
1800 mid_range_time,
|
|
|
1801 starting_ambient_pressure,
|
|
|
1802 initial_nitrogen_pressure,
|
|
|
1803 function_at_high_bound;
|
|
|
1804
|
|
|
1805 float time_to_start_of_deco_zone,
|
|
|
1806 high_bound_helium_pressure,
|
|
|
1807 helium_rate,
|
|
|
1808 differential_change;
|
|
|
1809 float fraction_helium_begin;
|
|
|
1810 float fraction_helium_end;
|
|
|
1811 float fraction_nitrogen_begin;
|
|
|
1812 float fraction_nitrogen_end;
|
|
|
1813 float ending_ambient_pressure;
|
|
|
1814 float time_test;
|
|
|
1815
|
|
|
1816
|
|
|
1817 /* loop */
|
|
|
1818 /* =============================================================================== */
|
|
|
1819 /* CALCULATIONS */
|
|
|
1820 /* First initialize some variables */
|
|
|
1821 /* =============================================================================== */
|
|
|
1822
|
|
|
1823 *depth_start_of_deco_zone = 0.0f;
|
|
|
1824 starting_ambient_pressure = *starting_depth + barometric_pressure;
|
|
|
1825
|
|
|
1826 //>>>>>>>>>>>>>>>>>>>>
|
|
|
1827 //Test depth to calculate helium_rate and nitrogen_rate
|
|
|
1828 ending_ambient_pressure = starting_ambient_pressure/2;
|
|
|
1829
|
|
|
1830 time_test = (ending_ambient_pressure - starting_ambient_pressure) / *rate;
|
|
863
|
1831 decom_get_inert_gases(starting_ambient_pressure / 10.0, (&pDiveSettings->decogaslist[mix_number]), &fraction_nitrogen_begin, &fraction_helium_begin );
|
|
|
1832 decom_get_inert_gases(ending_ambient_pressure / 10.0, (&pDiveSettings->decogaslist[mix_number]), &fraction_nitrogen_end, &fraction_helium_end );
|
|
38
|
1833 initial_inspired_he_pressure = (starting_ambient_pressure - WATER_VAPOR_PRESSURE) * fraction_helium_begin;
|
|
|
1834 initial_inspired_n2_pressure = (starting_ambient_pressure - WATER_VAPOR_PRESSURE) * fraction_nitrogen_begin;
|
|
|
1835 helium_rate = ((ending_ambient_pressure - WATER_VAPOR_PRESSURE)* fraction_helium_end - initial_inspired_he_pressure)/time_test;
|
|
|
1836 nitrogen_rate = ((ending_ambient_pressure - WATER_VAPOR_PRESSURE)* fraction_nitrogen_end - initial_inspired_n2_pressure)/time_test;
|
|
|
1837 //>>>>>>>>>>>>>>>>>>>>>
|
|
|
1838 /*initial_inspired_he_pressure =
|
|
|
1839 (starting_ambient_pressure - water_vapor_pressure) *
|
|
|
1840 fraction_helium[mix_number - 1];
|
|
|
1841 initial_inspired_n2_pressure =
|
|
|
1842 (starting_ambient_pressure - water_vapor_pressure) *
|
|
|
1843 fraction_nitrogen[mix_number - 1];
|
|
|
1844 helium_rate = *rate * fraction_helium[mix_number - 1];
|
|
|
1845 nitrogen_rate = *rate * fraction_nitrogen[mix_number - 1];*/
|
|
|
1846
|
|
|
1847 /* =============================================================================== */
|
|
|
1848 /* ESTABLISH THE BOUNDS FOR THE ROOT SEARCH USING THE BISECTION METHOD */
|
|
|
1849 /* AND CHECK TO MAKE SURE THAT THE ROOT WILL BE WITHIN BOUNDS. PROCESS */
|
|
|
1850 /* EACH COMPARTMENT INDIVIDUALLY AND FIND THE MAXIMUM DEPTH ACROSS ALL */
|
|
|
1851 /* COMPARTMENTS (LEADING COMPARTMENT) */
|
|
|
1852 /* In this case, we are solving for time - the time when the gas tension in */
|
|
|
1853 /* the compartment will be equal to ambient pressure. The low bound for time */
|
|
|
1854 /* is set at zero and the high bound is set at the time it would take to */
|
|
|
1855 /* ascend to zero ambient pressure (absolute). Since the ascent rate is */
|
|
|
1856 /* negative, a multiplier of -1.0 is used to make the time positive. The */
|
|
|
1857 /* desired point when gas tension equals ambient pressure is found at a time */
|
|
|
1858 /* somewhere between these endpoints. The algorithm checks to make sure that */
|
|
|
1859 /* the solution lies in between these bounds by first computing the low bound */
|
|
|
1860 /* and high bound function values. */
|
|
|
1861 /* =============================================================================== */
|
|
|
1862
|
|
863
|
1863 low_bound = 0.0;
|
|
38
|
1864 high_bound = starting_ambient_pressure / *rate * -1.0f;
|
|
|
1865 for (i = 1; i <= 16; ++i)
|
|
|
1866 {
|
|
|
1867 initial_helium_pressure = helium_pressure[i - 1];
|
|
|
1868 initial_nitrogen_pressure = nitrogen_pressure[i - 1];
|
|
|
1869 function_at_low_bound =
|
|
|
1870 initial_helium_pressure +
|
|
|
1871 initial_nitrogen_pressure +
|
|
|
1872 CONSTANT_PRESSURE_OTHER_GASES -
|
|
|
1873 starting_ambient_pressure;
|
|
|
1874 high_bound_helium_pressure =
|
|
|
1875 schreiner_equation__2(&initial_inspired_he_pressure,
|
|
|
1876 &helium_rate,
|
|
|
1877 &high_bound,
|
|
|
1878 &HELIUM_TIME_CONSTANT[i - 1],
|
|
|
1879 &initial_helium_pressure);
|
|
|
1880 high_bound_nitrogen_pressure =
|
|
|
1881 schreiner_equation__2(&initial_inspired_n2_pressure,
|
|
|
1882 &nitrogen_rate,
|
|
|
1883 &high_bound,
|
|
|
1884 &NITROGEN_TIME_CONSTANT[i - 1],
|
|
|
1885 &initial_nitrogen_pressure);
|
|
|
1886 function_at_high_bound = high_bound_helium_pressure +
|
|
|
1887 high_bound_nitrogen_pressure +
|
|
|
1888 CONSTANT_PRESSURE_OTHER_GASES;
|
|
|
1889 if (function_at_high_bound * function_at_low_bound >= 0.0f)
|
|
|
1890 {
|
|
|
1891 printf("\nERROR! ROOT IS NOT WITHIN BRACKETS");
|
|
|
1892 }
|
|
|
1893
|
|
|
1894 /* =============================================================================== */
|
|
|
1895 /* APPLY THE BISECTION METHOD IN SEVERAL ITERATIONS UNTIL A SOLUTION WITH */
|
|
|
1896 /* THE DESIRED ACCURACY IS FOUND */
|
|
|
1897 /* Note: the program allows for up to 100 iterations. Normally an exit will */
|
|
|
1898 /* be made from the loop well before that number. If, for some reason, the */
|
|
|
1899 /* program exceeds 100 iterations, there will be a pause to alert the user. */
|
|
|
1900 /* =============================================================================== */
|
|
|
1901
|
|
|
1902 if (function_at_low_bound < 0.0f)
|
|
|
1903 {
|
|
|
1904 time_to_start_of_deco_zone = low_bound;
|
|
|
1905 differential_change = high_bound - low_bound;
|
|
|
1906 } else {
|
|
|
1907 time_to_start_of_deco_zone = high_bound;
|
|
|
1908 differential_change = low_bound - high_bound;
|
|
|
1909 }
|
|
|
1910 for (j = 1; j <= 100; ++j)
|
|
|
1911 {
|
|
|
1912 last_diff_change = differential_change;
|
|
|
1913 differential_change = last_diff_change * 0.5f;
|
|
|
1914 mid_range_time =
|
|
|
1915 time_to_start_of_deco_zone +
|
|
|
1916 differential_change;
|
|
|
1917 mid_range_helium_pressure =
|
|
|
1918 schreiner_equation__2(&initial_inspired_he_pressure,
|
|
|
1919 &helium_rate,
|
|
|
1920 &mid_range_time,
|
|
|
1921 &HELIUM_TIME_CONSTANT[i - 1],
|
|
|
1922 &initial_helium_pressure);
|
|
|
1923 mid_range_nitrogen_pressure =
|
|
|
1924 schreiner_equation__2(&initial_inspired_n2_pressure,
|
|
|
1925 &nitrogen_rate,
|
|
|
1926 &mid_range_time,
|
|
|
1927 &NITROGEN_TIME_CONSTANT[i - 1],
|
|
|
1928 &initial_nitrogen_pressure);
|
|
|
1929 function_at_mid_range =
|
|
|
1930 mid_range_helium_pressure +
|
|
|
1931 mid_range_nitrogen_pressure +
|
|
|
1932 CONSTANT_PRESSURE_OTHER_GASES -
|
|
|
1933 (starting_ambient_pressure + *rate * mid_range_time);
|
|
|
1934 if (function_at_mid_range <= 0.0f) {
|
|
|
1935 time_to_start_of_deco_zone = mid_range_time;
|
|
|
1936 }
|
|
|
1937 if( fabs(differential_change) < 0.001f
|
|
|
1938 || function_at_mid_range == 0.0f)
|
|
|
1939 {
|
|
|
1940 goto L170;
|
|
|
1941 }
|
|
|
1942 /* L150: */
|
|
|
1943 }
|
|
|
1944 printf("\nERROR! ROOT SEARCH EXCEEDED MAXIMUM ITERATIONS");
|
|
|
1945 //pause();
|
|
|
1946
|
|
|
1947 /* =============================================================================== */
|
|
|
1948 /* When a solution with the desired accuracy is found, the program jumps out */
|
|
|
1949 /* of the loop to Line 170 and assigns the solution value for the individual */
|
|
|
1950 /* compartment. */
|
|
|
1951 /* =============================================================================== */
|
|
|
1952
|
|
|
1953 L170:
|
|
|
1954 cpt_depth_start_of_deco_zone =
|
|
|
1955 starting_ambient_pressure +
|
|
|
1956 *rate * time_to_start_of_deco_zone -
|
|
|
1957 barometric_pressure;
|
|
|
1958
|
|
|
1959 /* =============================================================================== */
|
|
|
1960 /* The overall solution will be the compartment with the maximum depth where */
|
|
|
1961 /* gas tension equals ambient pressure (leading compartment). */
|
|
|
1962 /* =============================================================================== */
|
|
|
1963
|
|
|
1964 *depth_start_of_deco_zone =
|
|
|
1965 fmaxf(*depth_start_of_deco_zone, cpt_depth_start_of_deco_zone);
|
|
|
1966 /* L200: */
|
|
|
1967 }
|
|
|
1968 return 0;
|
|
|
1969 } /* calc_start_of_deco_zone */
|
|
|
1970
|
|
|
1971 /* =============================================================================== */
|
|
|
1972 /* SUBROUTINE PROJECTED_ASCENT */
|
|
|
1973 /* Purpose: This subprogram performs a simulated ascent outside of the main */
|
|
|
1974 /* program to ensure that a deco ceiling will not be violated due to unusual */
|
|
|
1975 /* gas loading during ascent (on-gassing). If the deco ceiling is violated, */
|
|
|
1976 /* the stop depth will be adjusted deeper by the step size until a safe */
|
|
|
1977 /* ascent can be made. */
|
|
|
1978 /* =============================================================================== */
|
|
|
1979
|
|
290
|
1980 static int projected_ascent(float *starting_depth,
|
|
38
|
1981 float *rate,
|
|
|
1982 float *deco_stop_depth,
|
|
|
1983 float *step_size)
|
|
|
1984 {
|
|
|
1985 /* Local variables */
|
|
|
1986 float weighted_allowable_gradient,
|
|
|
1987 ending_ambient_pressure,
|
|
|
1988 temp_gas_loading[16];
|
|
|
1989 int i;
|
|
|
1990 float allowable_gas_loading[16];
|
|
|
1991 float temp_nitrogen_pressure[16];
|
|
|
1992 float temp_helium_pressure[16];
|
|
|
1993 float run_time_save = 0;
|
|
|
1994
|
|
|
1995 /* loop */
|
|
|
1996 /* =============================================================================== */
|
|
|
1997 /* CALCULATIONS */
|
|
|
1998 /* =============================================================================== */
|
|
|
1999
|
|
|
2000
|
|
|
2001 L665:
|
|
|
2002 ending_ambient_pressure = *deco_stop_depth + barometric_pressure;
|
|
|
2003 for (i = 1; i <= 16; ++i) {
|
|
|
2004 temp_helium_pressure[i - 1] = helium_pressure[i - 1];
|
|
|
2005 temp_nitrogen_pressure[i - 1] = nitrogen_pressure[i - 1];
|
|
|
2006 }
|
|
|
2007 run_time_save = run_time;
|
|
|
2008 gas_loadings_ascent_descen(temp_helium_pressure, temp_nitrogen_pressure, *starting_depth,*deco_stop_depth,*rate,true);
|
|
|
2009 run_time = run_time_save;
|
|
|
2010
|
|
|
2011 for (i = 1; i <= 16; ++i)
|
|
|
2012 {
|
|
|
2013 temp_gas_loading[i - 1] =
|
|
|
2014 temp_helium_pressure[i - 1] +
|
|
|
2015 temp_nitrogen_pressure[i - 1];
|
|
|
2016 if (temp_gas_loading[i - 1] > 0.0f)
|
|
|
2017 {
|
|
|
2018 weighted_allowable_gradient =
|
|
|
2019 (allowable_gradient_he[i - 1] *
|
|
|
2020 temp_helium_pressure[i - 1] +
|
|
|
2021 allowable_gradient_n2[i - 1] *
|
|
|
2022 temp_nitrogen_pressure[i - 1]) / temp_gas_loading[i - 1];
|
|
|
2023 } else {
|
|
|
2024 /* Computing MIN */
|
|
|
2025 weighted_allowable_gradient = fminf(allowable_gradient_he[i - 1],allowable_gradient_n2[i - 1]);
|
|
|
2026 }
|
|
|
2027 allowable_gas_loading[i - 1] =
|
|
|
2028 ending_ambient_pressure +
|
|
|
2029 weighted_allowable_gradient -
|
|
|
2030 CONSTANT_PRESSURE_OTHER_GASES;
|
|
|
2031 /* L670: */
|
|
|
2032 }
|
|
|
2033 for (i = 1; i <= 16; ++i) {
|
|
|
2034 if (temp_gas_loading[i - 1] > allowable_gas_loading[i - 1]) {
|
|
|
2035 *deco_stop_depth += *step_size;
|
|
|
2036 goto L665;
|
|
|
2037 }
|
|
|
2038 /* L671: */
|
|
|
2039 }
|
|
|
2040 return 0;
|
|
|
2041 } /* projected_ascent */
|
|
|
2042
|
|
|
2043 /* =============================================================================== */
|
|
|
2044 /* SUBROUTINE DECOMPRESSION_STOP */
|
|
|
2045 /* Purpose: This subprogram calculates the required time at each */
|
|
|
2046 /* decompression stop. */
|
|
|
2047 /* =============================================================================== */
|
|
|
2048
|
|
290
|
2049 static void decompression_stop(float *deco_stop_depth,
|
|
38
|
2050 float *step_size,
|
|
|
2051 _Bool final_deco_calculation)
|
|
|
2052 {
|
|
|
2053 /* Local variables */
|
|
|
2054 float inspired_nitrogen_pressure;
|
|
|
2055 // short last_segment_number;
|
|
|
2056 // float weighted_allowable_gradient;
|
|
|
2057 float initial_helium_pressure[16];
|
|
|
2058 /* by hw */
|
|
51
|
2059 float initial_CNS = gCNS_VPM;
|
|
38
|
2060
|
|
|
2061 //static float time_counter;
|
|
|
2062 short i;
|
|
|
2063 float ambient_pressure;
|
|
|
2064 float inspired_helium_pressure,
|
|
|
2065 next_stop;
|
|
|
2066 //last_run_time,
|
|
|
2067 //temp_segment_time;
|
|
|
2068
|
|
|
2069 float deco_ceiling_depth,
|
|
|
2070 initial_nitrogen_pressure[16];
|
|
|
2071 //round_up_operation;
|
|
|
2072 float fraction_helium_begin;
|
|
|
2073 float fraction_nitrogen_begin;
|
|
|
2074 int count = 0;
|
|
|
2075 _Bool buehlmann_wait = false;
|
|
|
2076 float tissue_He_saturation[16];
|
|
|
2077 float tissue_N2_saturation[16];
|
|
877
|
2078 float vpm_buehlmann_safety_gradient = 1.0f - (((float)pDiveSettings->vpm_conservatism) / 40);
|
|
38
|
2079 /* loop */
|
|
|
2080 /* =============================================================================== */
|
|
|
2081 /* CALCULATIONS */
|
|
|
2082 /* =============================================================================== */
|
|
|
2083
|
|
|
2084 segment_time = 0;
|
|
|
2085 // temp_segment_time = segment_time;
|
|
|
2086 ambient_pressure = *deco_stop_depth + barometric_pressure;
|
|
|
2087 //ending_ambient_pressure = ambient_pressure;
|
|
|
2088 decom_get_inert_gases(ambient_pressure / 10, (&pDiveSettings->decogaslist[mix_number]), &fraction_nitrogen_begin, &fraction_helium_begin );
|
|
|
2089
|
|
877
|
2090 if(*deco_stop_depth == (float)(pDiveSettings->last_stop_depth_bar * 10))
|
|
38
|
2091 next_stop = 0;
|
|
|
2092 else
|
|
|
2093 {
|
|
|
2094 next_stop = *deco_stop_depth - *step_size;
|
|
877
|
2095 next_stop = fmaxf(next_stop,(float)pDiveSettings->last_stop_depth_bar * 10);
|
|
38
|
2096 }
|
|
|
2097
|
|
|
2098 inspired_helium_pressure =
|
|
|
2099 (ambient_pressure - WATER_VAPOR_PRESSURE) * fraction_helium_begin;
|
|
|
2100 inspired_nitrogen_pressure =
|
|
|
2101 (ambient_pressure - WATER_VAPOR_PRESSURE) * fraction_nitrogen_begin;
|
|
|
2102
|
|
|
2103 /* =============================================================================== */
|
|
|
2104 /* Check to make sure that program won't lock up if unable to decompress */
|
|
|
2105 /* to the next stop. If so, write error message and terminate program. */
|
|
|
2106 /* =============================================================================== */
|
|
|
2107
|
|
|
2108 //deco_ceiling_depth = next_stop +1; //deco_ceiling_depth = next_stop + 1;
|
|
|
2109 if(!vpm_violates_buehlmann)
|
|
149
|
2110 {
|
|
38
|
2111 calc_deco_ceiling(&deco_ceiling_depth, false); //weg, weil auf jeden Fall schleife für safety und so konservativer
|
|
149
|
2112 }
|
|
38
|
2113 else
|
|
149
|
2114 {
|
|
863
|
2115 deco_ceiling_depth = next_stop + 1.0;
|
|
149
|
2116 }
|
|
38
|
2117 if(deco_ceiling_depth > next_stop)
|
|
|
2118 {
|
|
|
2119 while (deco_ceiling_depth > next_stop)
|
|
|
2120 {
|
|
|
2121
|
|
863
|
2122 segment_time += 60.0;
|
|
|
2123 if(segment_time >= 999.0 )
|
|
38
|
2124 {
|
|
863
|
2125 segment_time = 999.0 ;
|
|
38
|
2126 run_time += segment_time;
|
|
|
2127 return;
|
|
|
2128 }
|
|
|
2129 //goto L700;
|
|
|
2130 initial_CNS = gCNS_VPM;
|
|
|
2131 decom_oxygen_calculate_cns_exposure(60*60,&pDiveSettings->decogaslist[mix_number],ambient_pressure/10,&gCNS_VPM);
|
|
|
2132 for (i = 0; i < 16; i++)
|
|
|
2133 {
|
|
|
2134 initial_helium_pressure[i] = helium_pressure[i];
|
|
|
2135 initial_nitrogen_pressure[i] = nitrogen_pressure[i];
|
|
|
2136 helium_pressure[i] += (inspired_helium_pressure - helium_pressure[i]) * float_buehlmann_He_factor_expositon_one_hour[i];
|
|
|
2137 nitrogen_pressure[i] += (inspired_nitrogen_pressure - nitrogen_pressure[i]) * float_buehlmann_N2_factor_expositon_one_hour[i];
|
|
|
2138 }
|
|
|
2139 calc_deco_ceiling(&deco_ceiling_depth, false);
|
|
|
2140 }
|
|
|
2141 if(deco_ceiling_depth < next_stop)
|
|
|
2142 {
|
|
863
|
2143 segment_time -= 60.0;
|
|
38
|
2144 gCNS_VPM = initial_CNS;
|
|
|
2145 for (i = 0; i < 16; i++)
|
|
|
2146 {
|
|
|
2147 helium_pressure[i] = initial_helium_pressure[i];
|
|
|
2148 nitrogen_pressure[i] = initial_nitrogen_pressure[i];
|
|
|
2149 }
|
|
|
2150 deco_ceiling_depth = next_stop +1;
|
|
|
2151 }
|
|
|
2152 count = 0;
|
|
|
2153 while (deco_ceiling_depth > next_stop && count < 13)
|
|
|
2154 {
|
|
|
2155 count++;
|
|
|
2156 segment_time += 5;
|
|
|
2157 //goto L700;
|
|
|
2158 initial_CNS = gCNS_VPM;
|
|
|
2159 decom_oxygen_calculate_cns_exposure(60*5,&pDiveSettings->decogaslist[mix_number],ambient_pressure/10,&gCNS_VPM);
|
|
|
2160 for (i = 0; i < 16; i++)
|
|
|
2161 {
|
|
|
2162 initial_helium_pressure[i] = helium_pressure[i];
|
|
|
2163 initial_nitrogen_pressure[i] = nitrogen_pressure[i];
|
|
|
2164 helium_pressure[i] += (inspired_helium_pressure - helium_pressure[i]) * float_buehlmann_He_factor_expositon_five_minutes[i];
|
|
|
2165 nitrogen_pressure[i] += (inspired_nitrogen_pressure - nitrogen_pressure[i]) * float_buehlmann_N2_factor_expositon_five_minutes[i];
|
|
|
2166 }
|
|
|
2167 calc_deco_ceiling(&deco_ceiling_depth, false);
|
|
|
2168 }
|
|
|
2169 if(deco_ceiling_depth < next_stop)
|
|
|
2170 {
|
|
|
2171 segment_time -= 5;
|
|
|
2172 gCNS_VPM = initial_CNS;
|
|
|
2173 for (i = 0; i < 16; i++) {
|
|
|
2174 helium_pressure[i] = initial_helium_pressure[i];
|
|
|
2175 nitrogen_pressure[i] = initial_nitrogen_pressure[i];
|
|
|
2176 }
|
|
|
2177 deco_ceiling_depth = next_stop +1;
|
|
|
2178 }
|
|
|
2179 buehlmann_wait = false;
|
|
|
2180 while (buehlmann_wait || (deco_ceiling_depth > next_stop))
|
|
|
2181 {
|
|
|
2182 //time_counter = temp_segment_time;
|
|
863
|
2183 segment_time += 1.0;
|
|
38
|
2184
|
|
863
|
2185 if(segment_time >= 999.0 )
|
|
38
|
2186 {
|
|
863
|
2187 segment_time = 999.0 ;
|
|
38
|
2188 run_time += segment_time;
|
|
|
2189 return;
|
|
|
2190 }
|
|
|
2191 //goto L700;
|
|
|
2192 initial_CNS = gCNS_VPM;
|
|
877
|
2193 decom_oxygen_calculate_cns_exposure(60*1,&pDiveSettings->decogaslist[mix_number],ambient_pressure/10,&gCNS_VPM);
|
|
38
|
2194 for (i = 0; i < 16; i++)
|
|
|
2195 {
|
|
|
2196 initial_helium_pressure[i] = helium_pressure[i];
|
|
|
2197 initial_nitrogen_pressure[i] = nitrogen_pressure[i];
|
|
|
2198 helium_pressure[i] += (inspired_helium_pressure - helium_pressure[i]) * float_buehlmann_He_factor_expositon_one_minute[i];
|
|
|
2199 nitrogen_pressure[i] += (inspired_nitrogen_pressure - nitrogen_pressure[i]) * float_buehlmann_N2_factor_expositon_one_minute[i];
|
|
|
2200 }
|
|
|
2201 if(!buehlmann_wait)
|
|
|
2202 calc_deco_ceiling(&deco_ceiling_depth, false);
|
|
|
2203
|
|
|
2204 if(buehlmannSafety && final_deco_calculation && !(deco_ceiling_depth > next_stop))
|
|
|
2205 {
|
|
|
2206 for (i = 0; i < 16; i++)
|
|
|
2207 {
|
|
|
2208 tissue_He_saturation[i] = helium_pressure[i] / 10;
|
|
|
2209 tissue_N2_saturation[i] = nitrogen_pressure[i] / 10;
|
|
|
2210 }
|
|
|
2211 if( (fabsf(nitrogen_pressure[15] - inspired_nitrogen_pressure) < 0.00001f) && (fabsf(helium_pressure[15] - inspired_helium_pressure) < 0.00001f)
|
|
|
2212 && (fabsf(nitrogen_pressure[0] - inspired_nitrogen_pressure) < 0.00001f) && (fabsf(helium_pressure[0] - inspired_helium_pressure) < 0.00001f))
|
|
|
2213 {
|
|
|
2214 buehlmann_wait_exceeded = true;
|
|
|
2215 break;
|
|
|
2216 }
|
|
|
2217
|
|
|
2218 if(decom_tissue_test_tolerance(tissue_N2_saturation, tissue_He_saturation, vpm_buehlmann_safety_gradient, (next_stop / 10.0f) + pInput->pressure_surface_bar))
|
|
|
2219 break;
|
|
|
2220
|
|
|
2221 buehlmann_wait = true;
|
|
|
2222 }
|
|
|
2223 }
|
|
|
2224 if(buehlmann_wait)
|
|
149
|
2225 {
|
|
38
|
2226 vpm_violates_buehlmann = true;
|
|
149
|
2227 }
|
|
|
2228 if(!buehlmann_wait)
|
|
38
|
2229 {
|
|
|
2230 if(deco_ceiling_depth < next_stop)
|
|
|
2231 {
|
|
|
2232 segment_time -= 1;
|
|
|
2233 gCNS_VPM = initial_CNS;
|
|
|
2234 for (i = 0; i < 16; i++) {
|
|
|
2235 helium_pressure[i] = initial_helium_pressure[i];
|
|
|
2236 nitrogen_pressure[i] = initial_nitrogen_pressure[i];
|
|
|
2237 }
|
|
|
2238 deco_ceiling_depth = next_stop +1;
|
|
|
2239 }
|
|
|
2240 while (deco_ceiling_depth > next_stop)
|
|
|
2241 {
|
|
|
2242 //time_counter = temp_segment_time;
|
|
|
2243 segment_time += (float) 1.0f / 3.0f;
|
|
|
2244 //goto L700;
|
|
|
2245 initial_CNS = gCNS_VPM;
|
|
|
2246 decom_oxygen_calculate_cns_exposure(20,&pDiveSettings->decogaslist[mix_number],ambient_pressure/10,&gCNS_VPM);
|
|
|
2247 for (i = 0; i < 16; i++)
|
|
|
2248 {
|
|
|
2249 helium_pressure[i] += (inspired_helium_pressure - helium_pressure[i]) * float_buehlmann_He_factor_expositon_20_seconds[i];
|
|
|
2250 nitrogen_pressure[i] += (inspired_nitrogen_pressure - nitrogen_pressure[i]) * float_buehlmann_N2_factor_expositon_20_seconds[i];
|
|
|
2251 }
|
|
|
2252 calc_deco_ceiling(&deco_ceiling_depth, false);
|
|
|
2253 }
|
|
|
2254 }
|
|
|
2255 }
|
|
|
2256
|
|
|
2257 /*float pressure_save =dive_data.pressure;
|
|
|
2258 dive_data.pressure = ambient_pressure/10;
|
|
|
2259 tissues_exposure_stage(st_deco_test,(int)(segment_time * 60), &dive_data, &gaslist);
|
|
|
2260 dive_data.pressure = pressure_save;*/
|
|
|
2261 run_time += segment_time;
|
|
|
2262 return;
|
|
|
2263 } /* decompression_stop */
|
|
|
2264
|
|
|
2265 /* =============================================================================== */
|
|
|
2266 // SUROUTINE BOYLES_LAW_COMPENSATION
|
|
|
2267 // Purpose: This subprogram calculates the reduction in allowable gradients
|
|
|
2268 // with decreasing ambient pressure during the decompression profile based
|
|
|
2269 // on Boyle's Law considerations.
|
|
|
2270 //===============================================================================
|
|
290
|
2271 static void BOYLES_LAW_COMPENSATION (float* First_Stop_Depth,
|
|
38
|
2272 float* Deco_Stop_Depth,
|
|
|
2273 float* Step_Size)
|
|
|
2274 {
|
|
|
2275 short i;
|
|
|
2276
|
|
|
2277 float Next_Stop;
|
|
|
2278 float Ambient_Pressure_First_Stop, Ambient_Pressure_Next_Stop;
|
|
|
2279 float Amb_Press_First_Stop_Pascals, Amb_Press_Next_Stop_Pascals;
|
|
|
2280 float A, B, C, Low_Bound, High_Bound, Ending_Radius;
|
|
|
2281 float Deco_Gradient_Pascals;
|
|
|
2282 float Allow_Grad_First_Stop_He_Pa, Radius_First_Stop_He;
|
|
|
2283 float Allow_Grad_First_Stop_N2_Pa, Radius_First_Stop_N2;
|
|
|
2284
|
|
|
2285 //===============================================================================
|
|
|
2286 // LO//AL ARRAYS
|
|
|
2287 //===============================================================================
|
|
|
2288 // float Radius1_He[16], Radius2_He[16];
|
|
|
2289 // float Radius1_N2[16], Radius2_N2[16];
|
|
|
2290 float root_factor;
|
|
|
2291
|
|
|
2292 //===============================================================================
|
|
|
2293 // CALCULATIONS
|
|
|
2294 //===============================================================================
|
|
|
2295 Next_Stop = *Deco_Stop_Depth - *Step_Size;
|
|
|
2296
|
|
|
2297 Ambient_Pressure_First_Stop = *First_Stop_Depth +
|
|
|
2298 barometric_pressure;
|
|
|
2299
|
|
|
2300 Ambient_Pressure_Next_Stop = Next_Stop + barometric_pressure;
|
|
|
2301
|
|
|
2302 Amb_Press_First_Stop_Pascals = (Ambient_Pressure_First_Stop/UNITS_FACTOR) * 101325.0f;
|
|
|
2303
|
|
|
2304 Amb_Press_Next_Stop_Pascals =
|
|
|
2305 (Ambient_Pressure_Next_Stop/UNITS_FACTOR) * 101325.0f;
|
|
|
2306 root_factor = powf(Amb_Press_First_Stop_Pascals/Amb_Press_Next_Stop_Pascals,1.0f / 3.0f);
|
|
|
2307
|
|
|
2308 for( i = 0; i < 16;i++)
|
|
|
2309 {
|
|
|
2310 Allow_Grad_First_Stop_He_Pa =
|
|
|
2311 (allowable_gradient_he[i]/UNITS_FACTOR) * 101325.0f;
|
|
|
2312
|
|
|
2313 Radius_First_Stop_He = (2.0f * SURFACE_TENSION_GAMMA) /
|
|
|
2314 Allow_Grad_First_Stop_He_Pa;
|
|
|
2315
|
|
|
2316 // Radius1_He[i] = Radius_First_Stop_He;
|
|
|
2317 A = Amb_Press_Next_Stop_Pascals;
|
|
|
2318 B = -2.0f * SURFACE_TENSION_GAMMA;
|
|
|
2319 C = (Amb_Press_First_Stop_Pascals + (2.0f * SURFACE_TENSION_GAMMA)/
|
|
|
2320 Radius_First_Stop_He)* Radius_First_Stop_He*
|
|
|
2321 (Radius_First_Stop_He*(Radius_First_Stop_He));
|
|
|
2322 Low_Bound = Radius_First_Stop_He;
|
|
|
2323 High_Bound = Radius_First_Stop_He * root_factor;
|
|
|
2324 //*pow(Amb_Press_First_Stop_Pascals/Amb_Press_Next_Stop_Pascals,1.0/3.0);
|
|
|
2325 //*(Amb_Press_First_Stop_Pascals/Amb_Press_Next_Stop_Pascals)**(1.0/3.0);
|
|
|
2326
|
|
|
2327 radius_root_finder(&A,&B,&C, &Low_Bound, &High_Bound,
|
|
|
2328 &Ending_Radius);
|
|
|
2329
|
|
|
2330 // Radius2_He[i] = Ending_Radius;
|
|
|
2331 Deco_Gradient_Pascals = (2.0f * SURFACE_TENSION_GAMMA) /
|
|
|
2332 Ending_Radius;
|
|
|
2333
|
|
|
2334 deco_gradient_he[i] = (Deco_Gradient_Pascals / 101325.0f)*
|
|
|
2335 UNITS_FACTOR;
|
|
|
2336
|
|
|
2337 }
|
|
|
2338
|
|
|
2339 for( i = 0; i < 16;i++)
|
|
|
2340 {
|
|
|
2341 Allow_Grad_First_Stop_N2_Pa =
|
|
|
2342 (allowable_gradient_n2[i]/UNITS_FACTOR) * 101325.0f;
|
|
|
2343
|
|
|
2344 Radius_First_Stop_N2 = (2.0f * SURFACE_TENSION_GAMMA) /
|
|
|
2345 Allow_Grad_First_Stop_N2_Pa;
|
|
|
2346
|
|
|
2347 // Radius1_N2[i] = Radius_First_Stop_N2;
|
|
|
2348 A = Amb_Press_Next_Stop_Pascals;
|
|
|
2349 B = -2.0f * SURFACE_TENSION_GAMMA;
|
|
|
2350 C = (Amb_Press_First_Stop_Pascals + (2.0f * SURFACE_TENSION_GAMMA)/
|
|
|
2351 Radius_First_Stop_N2)* Radius_First_Stop_N2*
|
|
|
2352 (Radius_First_Stop_N2*(Radius_First_Stop_N2));
|
|
|
2353 Low_Bound = Radius_First_Stop_N2;
|
|
|
2354 High_Bound = Radius_First_Stop_N2* root_factor;//pow(Amb_Press_First_Stop_Pascals/Amb_Press_Next_Stop_Pascals,1.0/3.0);
|
|
|
2355
|
|
|
2356 //High_Bound = Radius_First_Stop_N2*exp(log(Amb_Press_First_Stop_Pascals/Amb_Press_Next_Stop_Pascals)/3);
|
|
|
2357 radius_root_finder(&A,&B,&C, &Low_Bound, &High_Bound,
|
|
|
2358 &Ending_Radius);
|
|
|
2359
|
|
|
2360 // Radius2_N2[i] = Ending_Radius;
|
|
|
2361 Deco_Gradient_Pascals = (2.0f * SURFACE_TENSION_GAMMA) /
|
|
|
2362 Ending_Radius;
|
|
|
2363
|
|
|
2364 deco_gradient_n2[i] = (Deco_Gradient_Pascals / 101325.0f)*
|
|
|
2365 UNITS_FACTOR;
|
|
|
2366 }
|
|
|
2367 }
|
|
|
2368
|
|
|
2369 /* =============================================================================== */
|
|
292
|
2370 // vpm_calc_ndl
|
|
|
2371 // Purpose: This function computes NDL (time where no decostops are needed)
|
|
38
|
2372 //===============================================================================
|
|
291
|
2373 #define MAX_NDL 240
|
|
|
2374
|
|
292
|
2375 static int vpm_calc_ndl(void)
|
|
38
|
2376 {
|
|
|
2377 static float future_helium_pressure[16];
|
|
|
2378 static float future_nitrogen_pressure[16];
|
|
|
2379 static int temp_segment_time;
|
|
|
2380 static int mix_number;
|
|
|
2381 static float inspired_helium_pressure;
|
|
|
2382 static float inspired_nitrogen_pressure;
|
|
|
2383
|
|
|
2384 float previous_helium_pressure[16];
|
|
|
2385 float previous_nitrogen_pressure[16];
|
|
|
2386 float ambient_pressure;
|
|
|
2387 float fraction_helium_begin;
|
|
|
2388 float fraction_nitrogen_begin;
|
|
|
2389 int i = 0;
|
|
|
2390 int count = 0;
|
|
|
2391 int status = CALC_END;
|
|
291
|
2392
|
|
38
|
2393 for(i = 0; i < 16;i++)
|
|
|
2394 {
|
|
863
|
2395 future_helium_pressure[i] = pInput->tissue_helium_bar[i] * 10.0;//tissue_He_saturation[st_dive][i] * 10;
|
|
|
2396 future_nitrogen_pressure[i] = pInput->tissue_nitrogen_bar[i] * 10.0;
|
|
38
|
2397 }
|
|
|
2398 temp_segment_time = 0;
|
|
|
2399
|
|
|
2400 mix_number = 0;
|
|
877
|
2401 ambient_pressure = pInput->pressure_ambient_bar * 10;
|
|
|
2402 decom_get_inert_gases( ambient_pressure / 10, (&pDiveSettings->decogaslist[mix_number]) , &fraction_nitrogen_begin, &fraction_helium_begin );
|
|
38
|
2403 inspired_helium_pressure =(ambient_pressure - WATER_VAPOR_PRESSURE) * fraction_helium_begin;
|
|
|
2404 inspired_nitrogen_pressure =(ambient_pressure - WATER_VAPOR_PRESSURE) *fraction_nitrogen_begin;
|
|
|
2405
|
|
|
2406 status = CALC_END;
|
|
|
2407 while (status == CALC_END)
|
|
|
2408 {
|
|
|
2409 count++;
|
|
|
2410 temp_segment_time += 60;
|
|
291
|
2411 if(temp_segment_time >= MAX_NDL)
|
|
38
|
2412 {
|
|
|
2413 pDecoInfo->output_ndl_seconds = temp_segment_time * 60;
|
|
292
|
2414 return CALC_NDL;
|
|
38
|
2415 }
|
|
|
2416 run_time += 60;
|
|
|
2417 //goto L700;
|
|
|
2418 for (i = 1; i <= 16; ++i) {
|
|
|
2419 previous_helium_pressure[i-1] = future_helium_pressure[i - 1];
|
|
|
2420 previous_nitrogen_pressure[i - 1] = future_nitrogen_pressure[i - 1];
|
|
|
2421 future_helium_pressure[i - 1] = future_helium_pressure[i - 1] + (inspired_helium_pressure - future_helium_pressure[i - 1]) * float_buehlmann_He_factor_expositon_one_hour[i-1];
|
|
|
2422 future_nitrogen_pressure[i - 1] = future_nitrogen_pressure[i - 1] + (inspired_nitrogen_pressure - future_nitrogen_pressure[i - 1]) * float_buehlmann_N2_factor_expositon_one_hour[i-1];
|
|
|
2423 helium_pressure[i - 1] = future_helium_pressure[i - 1];
|
|
|
2424 nitrogen_pressure[i - 1] = future_nitrogen_pressure[i - 1];
|
|
|
2425 }
|
|
|
2426 vpm_calc_deco();
|
|
|
2427 while((status = vpm_calc_critcal_volume(true,true)) == CALC_CRITICAL);
|
|
|
2428
|
|
|
2429 }
|
|
|
2430
|
|
|
2431 temp_segment_time -= 60;
|
|
|
2432 run_time -= 60;
|
|
|
2433 for (i = 1; i <= 16; ++i)
|
|
|
2434 {
|
|
|
2435 future_helium_pressure[i - 1] = previous_helium_pressure[i-1];
|
|
|
2436 future_nitrogen_pressure[i - 1] = previous_nitrogen_pressure[i - 1];
|
|
|
2437 }
|
|
|
2438
|
|
|
2439 status = CALC_END;
|
|
|
2440 if(temp_segment_time < 60)
|
|
|
2441 nullzeit_unter60 = true;
|
|
|
2442
|
|
|
2443 while (status == CALC_END)
|
|
|
2444 {
|
|
|
2445 temp_segment_time += 5;
|
|
291
|
2446 if(temp_segment_time >= MAX_NDL)
|
|
38
|
2447 {
|
|
|
2448 pDecoInfo->output_ndl_seconds = temp_segment_time * 60;
|
|
292
|
2449 return CALC_NDL;
|
|
38
|
2450 }
|
|
|
2451 if(nullzeit_unter60 && temp_segment_time > 60)
|
|
|
2452 {
|
|
|
2453 nullzeit_unter60 = false;
|
|
292
|
2454 return CALC_NDL;
|
|
38
|
2455 }
|
|
|
2456 run_time += 5;
|
|
|
2457 //goto L700;
|
|
|
2458 for (i = 1; i <= 16; ++i) {
|
|
|
2459 previous_helium_pressure[i-1] = future_helium_pressure[i - 1];
|
|
|
2460 previous_nitrogen_pressure[i - 1] = future_nitrogen_pressure[i - 1];
|
|
|
2461 future_helium_pressure[i - 1] = future_helium_pressure[i - 1] + (inspired_helium_pressure - future_helium_pressure[i - 1]) * float_buehlmann_He_factor_expositon_five_minutes[i-1];
|
|
|
2462 future_nitrogen_pressure[i - 1] = future_nitrogen_pressure[i - 1] + (inspired_nitrogen_pressure - future_nitrogen_pressure[i - 1]) * float_buehlmann_N2_factor_expositon_five_minutes[i-1];
|
|
|
2463 helium_pressure[i - 1] = future_helium_pressure[i - 1];
|
|
|
2464 nitrogen_pressure[i - 1] = future_nitrogen_pressure[i - 1];
|
|
|
2465 }
|
|
|
2466 vpm_calc_deco();
|
|
|
2467 while((status =vpm_calc_critcal_volume(true,true)) == CALC_CRITICAL);
|
|
|
2468 }
|
|
|
2469 temp_segment_time -= 5;
|
|
|
2470 run_time -= 5;
|
|
|
2471 for (i = 1; i <= 16; ++i) {
|
|
|
2472 future_helium_pressure[i - 1] = previous_helium_pressure[i-1];
|
|
|
2473 future_nitrogen_pressure[i - 1] = previous_nitrogen_pressure[i - 1];
|
|
|
2474 }
|
|
|
2475 status = CALC_END;
|
|
291
|
2476
|
|
38
|
2477 if(temp_segment_time <= 20)
|
|
|
2478 {
|
|
|
2479 while (status == CALC_END)
|
|
|
2480 {
|
|
|
2481 temp_segment_time += minimum_deco_stop_time;
|
|
|
2482 run_time += minimum_deco_stop_time;
|
|
|
2483 //goto L700;
|
|
|
2484 for (i = 1; i <= 16; ++i) {
|
|
|
2485 future_helium_pressure[i - 1] = future_helium_pressure[i - 1] + (inspired_helium_pressure - future_helium_pressure[i - 1]) * float_buehlmann_He_factor_expositon_one_minute[i-1];
|
|
|
2486 future_nitrogen_pressure[i - 1] = future_nitrogen_pressure[i - 1] + (inspired_nitrogen_pressure - future_nitrogen_pressure[i - 1]) * float_buehlmann_N2_factor_expositon_one_minute[i-1];
|
|
|
2487 helium_pressure[i - 1] = future_helium_pressure[i - 1];
|
|
|
2488 nitrogen_pressure[i - 1] =future_nitrogen_pressure[i - 1];
|
|
|
2489
|
|
|
2490 }
|
|
|
2491 vpm_calc_deco();
|
|
|
2492 while((status =vpm_calc_critcal_volume(true,true)) == CALC_CRITICAL);
|
|
|
2493
|
|
|
2494 }
|
|
|
2495 }
|
|
|
2496 else
|
|
|
2497 temp_segment_time += 5;
|
|
|
2498 pDecoInfo->output_ndl_seconds = temp_segment_time * 60;
|
|
|
2499 if(temp_segment_time > 1)
|
|
292
|
2500 return CALC_NDL;
|
|
38
|
2501 else
|
|
|
2502 return CALC_BEGIN;
|
|
|
2503 }
|
|
902
|
2504
|
|
|
2505 void vpm_table_init()
|
|
|
2506 {
|
|
|
2507 vpmTable.output_time_to_surface_seconds = 0;
|
|
907
|
2508 vpmTableState = VPM_TABLE_INIT;
|
|
|
2509 }
|
|
|
2510 uint8_t vpm_get_decozone(void)
|
|
|
2511 {
|
|
|
2512 return((uint8_t)pVpm->depth_start_of_deco_zone_save);
|
|
|
2513 }
|
|
|
2514 SvpmTableState vpm_get_TableState(void)
|
|
|
2515 {
|
|
|
2516 return vpmTableState;
|
|
902
|
2517 }
|
|
|
2518
|
