Mercurial > public > ostc4
annotate Common/Src/decom.c @ 605:1f665e31aca2
change O2_CALIB_FRACTION_O2 to 0.98
It's common sense that calibrating CCR's with O2 asumes a max. O2 content of
98%
author | heinrichsweikamp |
---|---|
date | Thu, 07 Jan 2021 09:53:04 +0100 (2021-01-07) |
parents | 239aa58b533d |
children | 1b995079c045 |
rev | line source |
---|---|
38 | 1 /////////////////////////////////////////////////////////////////////////////// |
2 /// -*- coding: UTF-8 -*- | |
3 /// | |
4 /// \file Common/Src/decom.c | |
5 /// \brief This code is used to calculate desat, calculated by RTE and send to Firmware | |
6 /// \author heinrichs weikamp gmbh | |
7 /// \date 22-Feb-2016 | |
8 /// | |
9 /// $Id$ | |
10 /////////////////////////////////////////////////////////////////////////////// | |
11 /// \par Copyright (c) 2014-2018 Heinrichs Weikamp gmbh | |
12 /// | |
13 /// This program is free software: you can redistribute it and/or modify | |
14 /// it under the terms of the GNU General Public License as published by | |
15 /// the Free Software Foundation, either version 3 of the License, or | |
16 /// (at your option) any later version. | |
17 /// | |
18 /// This program is distributed in the hope that it will be useful, | |
19 /// but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 /// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 /// GNU General Public License for more details. | |
22 /// | |
23 /// You should have received a copy of the GNU General Public License | |
24 /// along with this program. If not, see <http://www.gnu.org/licenses/>. | |
25 ////////////////////////////////////////////////////////////////////////////// | |
26 /** | |
27 @verbatim | |
28 ============================================================================== | |
29 ##### Changes ##### | |
30 ============================================================================== | |
31 V1.0.2 1602220x decom_oxygen_calculate_cns() changed to hwOS version | |
32 | |
33 @endverbatim | |
34 ****************************************************************************** | |
35 */ | |
36 | |
37 #include "decom.h" | |
38 | |
39 #include <math.h> | |
40 #include "settings.h" | |
41 #include "calc_crush.h" | |
42 | |
43 # define FRACTION_N2_AIR 0.7902 | |
44 | |
45 const float helium_time_constant[16] = { | |
46 3.68695308808482E-001, | |
47 2.29518933960247E-001, | |
48 1.46853216220327E-001, | |
49 9.91626867753856E-002, | |
50 6.78890480470074E-002, | |
51 4.78692804254106E-002, | |
52 3.37626488338989E-002, | |
53 2.38113081607676E-002, | |
54 1.68239606932026E-002, | |
55 1.25592893741610E-002, | |
56 9.80544886914621E-003, | |
57 7.67264977374303E-003, | |
58 6.01220557342307E-003, | |
59 4.70185307665137E-003, | |
60 3.68225234041620E-003, | |
61 2.88775228329769E-003}; | |
62 | |
63 const float nitrogen_time_constant[16] = { | |
64 1.38629436111989E-001, | |
65 8.66433975699932E-002, | |
66 5.54517744447956E-002, | |
67 3.74674151654024E-002, | |
68 2.56721177985165E-002, | |
69 1.80978376125312E-002, | |
70 1.27651414467762E-002, | |
71 9.00191143584345E-003, | |
72 6.35914844550409E-003, | |
73 4.74758342849278E-003, | |
74 3.70666941475907E-003, | |
75 2.90019740820061E-003, | |
76 2.27261370675392E-003, | |
77 1.77730046297422E-003, | |
78 1.39186180835330E-003, | |
79 1.09157036308653E-003}; | |
80 | |
81 | |
82 const float buehlmann_N2_a[] = { | |
83 1.1696f, | |
84 1.0000f, | |
85 0.8618f, | |
86 0.7562f, | |
87 0.6200f, | |
88 0.5043f, | |
89 0.4410f, | |
90 0.4000f, | |
91 0.3750f, | |
92 0.3500f, | |
93 0.3295f, | |
94 0.3065f, | |
95 0.2835f, | |
96 0.2610f, | |
97 0.2480f, | |
98 0.2327f}; | |
99 | |
100 const float buehlmann_N2_b[] = { | |
101 0.5578f, | |
102 0.6514f, | |
103 0.7222f, | |
104 0.7825f, | |
105 0.8126f, | |
106 0.8434f, | |
107 0.8693f, | |
108 0.8910f, | |
109 0.9092f, | |
110 0.9222f, | |
111 0.9319f, | |
112 0.9403f, | |
113 0.9477f, | |
114 0.9544f, | |
115 0.9602f, | |
116 0.9653f}; | |
117 | |
118 const float buehlmann_He_a[] = { | |
119 1.6189f, | |
120 1.3830f, | |
121 1.1919f, | |
122 1.0458f, | |
123 0.9220f, | |
124 0.8205f, | |
125 0.7305f, | |
126 0.6502f, | |
127 0.5950f, | |
128 0.5545f, | |
129 0.5333f, | |
130 0.5189f, | |
131 0.5181f, | |
132 0.5176f, | |
133 0.5172f, | |
134 0.5119f}; | |
135 | |
136 const float buehlmann_He_b[] = { | |
137 0.4770f, | |
138 0.5747f, | |
139 0.6527f, | |
140 0.7223f, | |
141 0.7582f, | |
142 0.7957f, | |
143 0.8279f, | |
144 0.8553f, | |
145 0.8757f, | |
146 0.8903f, | |
147 0.8997f, | |
148 0.9073f, | |
149 0.9122f, | |
150 0.9171f, | |
151 0.9217f, | |
152 0.9267f}; | |
153 | |
154 const float buehlmann_N2_t_halflife[] = { | |
155 5.0f, | |
156 8.0f, | |
157 12.5f, | |
158 18.5f, | |
159 27.0f, | |
160 38.3f, | |
161 54.3f, | |
162 77.0f, | |
163 109.0f, | |
164 146.0f, | |
165 187.0f, | |
166 239.0f, | |
167 305.0f, | |
168 390.0f, | |
169 498.0f, | |
170 635.0f}; | |
171 | |
172 const float buehlmann_He_t_halflife[] = { | |
173 1.88f, | |
174 3.02f, | |
175 4.72f, | |
176 6.99f, | |
177 10.21f, | |
178 14.48f, | |
179 20.53f, | |
180 29.11f, | |
181 41.20f, | |
182 55.19f, | |
183 70.69f, | |
184 90.34f, | |
185 115.29f, | |
186 147.42f, | |
187 188.24f, | |
188 240.03f}; | |
189 | |
190 const float float_buehlmann_N2_factor_expositon_one_second[] = { 2.30782347297664E-003f, 1.44301447809736E-003f, 9.23769302935806E-004f, 6.24261986779007E-004f, 4.27777107246730E-004f, 3.01585140931371E-004f, 2.12729727268379E-004f, 1.50020603047807E-004f, 1.05980191127841E-004f, 7.91232600646508E-005f, 6.17759153688224E-005f, 4.83354552742732E-005f, 3.78761777920511E-005f, 2.96212356654113E-005f, 2.31974277413727E-005f, 1.81926738960225E-005f}; | |
191 const float float_buehlmann_N2_factor_expositon_003_second[] = { 6.90750456296407E-003f, 4.32279956671600E-003f, 2.76874864793053E-003f, 1.87161709452954E-003f, 1.28278242026003E-003f, 9.04482589432765E-004f, 6.38053429621421E-004f, 4.49994293975742E-004f, 3.17906879170993E-004f, 2.37350999218289E-004f, 1.85316297551252E-004f, 1.44999356986975E-004f, 1.13624229615916E-004f, 8.88610747694640E-005f, 6.95906688746861E-005f, 5.45770287740943E-005f}; | |
192 const float float_buehlmann_N2_factor_expositon_008_second[] = { 1.83141447532454E-002f, 1.14859796471039E-002f, 7.36630472495203E-003f, 4.98319782231915E-003f, 3.41709742823104E-003f, 2.41013596224415E-003f, 1.70057124687550E-003f, 1.19953484034729E-003f, 8.47527105247492E-004f, 6.32810814525819E-004f, 4.94100480767923E-004f, 3.86618231662861E-004f, 3.02969256443353E-004f, 2.36945319086024E-004f, 1.85564355251966E-004f, 1.45532124251058E-004f}; | |
193 const float float_buehlmann_N2_factor_expositon_10_seconds[] = { 2.28400315657541E-002f, 1.43368013598124E-002f, 9.19938673477072E-003f, 6.22511239287027E-003f, 4.69545762670800E-003f, 3.01176178733265E-003f, 2.12526200031782E-003f, 1.49919365737827E-003f, 1.05929662305226E-03f, 7.909509380171760E-004f, 6.17587450108648E-004f, 4.83249432061905E-004f, 3.78697227222391E-004f, 2.61728759809380E-004f, 2.31950063482533E-004f, 1.81911845881011E-004f}; | |
194 const float float_buehlmann_N2_factor_expositon_18_seconds[] = { 4.07358806747357E-002f, 2.56581087982929E-002f, 1.64979259737517E-002f, 1.11772892486697E-002f, 7.67205373705648E-003f, 5.41463899418337E-003f, 3.82221908774349E-003f, 2.69693016270112E-003f, 1.90592594569927E-003f, 1.42326123023573E-003f, 1.11138278062062E-003f, 8.69680830683950E-004f, 6.81551750048359E-004f, 5.33048018290350E-004f, 4.17471377070378E-004f, 3.27417496114757E-004f}; | |
195 const float float_buehlmann_N2_factor_expositon_20_seconds[] = { 4.51583960895835E-002f, 2.84680588463941E-002f, 1.83141447532454E-002f, 1.24114727614367E-002f, 8.52086250432193E-003f, 6.01445286560154E-003f, 4.24600726206570E-003f, 2.99613973313428E-003f, 2.11747113676897E-003f, 1.58127627264804E-003f, 1.23479348595879E-003f, 9.66265334110261E-004f, 7.57251042854845E-004f, 5.92258033589421E-004f, 4.63846326133055E-004f, 3.63790599842373E-004f}; | |
196 const float float_buehlmann_N2_factor_expositon_one_minute[] = { 1.29449436703876E-001f, 8.29959567953288E-002f, 5.39423532744041E-002f, 3.67741962370398E-002f, 2.53453908775689E-002f, 1.79350552316596E-002f, 1.26840126026602E-002f, 8.96151553540825E-003f, 6.33897185233323E-003f, 4.73633146787078E-003f, 3.69980819572546E-003f, 2.89599589841472E-003f, 2.27003327536857E-003f, 1.77572199977927E-003f, 1.39089361795441E-003f, 1.09097481687104E-003f}; | |
197 const float float_buehlmann_N2_factor_expositon_100_second[] = { 2.06299474015900E-001f, 1.34463438993857E-001f, 8.82775114417832E-002f, 6.05359181023788E-002f, 4.18844218114071E-002f, 2.97126970072147E-002f, 2.10505144045823E-002f, 1.48911986890571E-002f, 1.05426136839346E-002f, 7.88141652426455E-003f, 6.15873909572406E-003f, 4.82199900095137E-003f, 3.78052526350936E-003f, 2.95778454900952E-003f, 2.31708109427220E-003f, 1.81763004457269E-003f}; | |
198 const float float_buehlmann_N2_factor_expositon_five_minutes[]= { 5.00000000000000E-001f, 3.51580222674495E-001f, 2.42141716744801E-001f, 1.70835801932547E-001f, 1.20463829104624E-001f, 8.65157896183918E-002f, 6.18314987350977E-002f, 4.40116547625051E-002f, 3.12955727186929E-002f, 2.34583889613009E-002f, 1.83626606868127E-002f, 1.43963540993090E-002f, 1.12987527093947E-002f, 8.84713405486026E-003f, 6.93514912851934E-003f, 5.44298480182925E-003f}; | |
199 const float float_buehlmann_N2_factor_expositon_800_second[] = { 8.42509868763141E-001f, 6.85019737526282E-001f, 5.22579198044792E-001f, 3.93205767018569E-001f, 2.89861248917861E-001f, 2.14397627137602E-001f, 1.56505490290652E-001f, 1.13102166881646E-001f, 8.12935637814599E-002f, 6.13392112527207E-002f, 4.82208523469105E-002f, 3.79311861210304E-002f, 2.98470272862601E-002f, 2.34187624071612E-002f, 1.83870151711824E-002f, 1.44488700649190E-002f}; | |
200 const float float_buehlmann_N2_factor_expositon_one_hour[]= { 9.99755859375000E-001f, 9.94475728271980E-001f, 9.64103176406343E-001f, 8.94394508891055E-001f, 7.85689004286732E-001f, 6.62392147498621E-001f, 5.35088626789486E-001f, 4.17318576947576E-001f, 3.17197008420226E-001f, 2.47876700002107E-001f, 1.99405069752929E-001f, 1.59713055172538E-001f, 1.27468761759271E-001f, 1.01149026804458E-001f, 8.01196838116008E-002f, 6.33955413542552E-002f}; | |
201 | |
202 const float float_buehlmann_He_factor_expositon_one_second[] = { 6.12608039419837E-003f, 3.81800836683133E-003f, 2.44456078654209E-003f, 1.65134647076792E-003f, 1.13084424730725E-003f, 7.97503165599123E-004f, 5.62552521860549E-004f, 3.96776399429366E-004f, 2.80360036664540E-004f, 2.09299583354805E-004f, 1.63410794820518E-004f, 1.27869320250551E-004f, 1.00198406028040E-004f, 7.83611475491108E-005f, 6.13689891868496E-005f, 4.81280465299827E-005f}; | |
203 const float float_buehlmann_He_factor_expositon_003_second[] = { 1.82658845044263E-002f, 1.14103491926518E-002f, 7.31576933570466E-003f, 4.94586307993539E-003f, 3.38869776192019E-003f, 2.39060197012086E-003f, 1.68670834759044E-003f, 1.18985696621965E-003f, 8.40844326779777E-004f, 6.27767340286467E-004f, 4.90152279561396E-004f, 3.83558911153159E-004f, 3.00565099928485E-004f, 2.35065021719993E-004f, 1.84095669333084E-004f, 1.44377190774980E-004f}; // 3 He | |
204 const float float_buehlmann_He_factor_expositon_008_second[] = { 4.79706116082057E-002f, 3.01390075707096E-002f, 1.93899772993034E-002f, 1.31346689569831E-002f, 9.01102820363486E-003f, 6.36224538449637E-003f, 4.49156910795023E-003f, 3.16980660943422E-003f, 2.24068067793926E-003f, 1.67317060331207E-003f, 1.30653891641375E-003f, 1.02249686330114E-003f, 8.01306192375617E-004f, 6.26717274191169E-004f, 4.90846474157092E-004f, 3.84959521834594E-004f}; // 8 He | |
205 const float float_buehlmann_He_factor_expositon_10_seconds[] = { 5.95993001714799E-002f, 3.75307444923134E-002f, 2.41784389107607E-002f, 1.63912909924208E-002f, 1.25106927410620E-002f, 7.94647192918641E-003f, 5.61130562069978E-003f, 3.96068706690245E-003f, 2.80006593100546E-003f, 2.09102564918129E-003f, 1.63290683272987E-003f, 1.27795767799976E-003f, 1.00153239354972E-003f, 7.33352120986130E-004f, 6.13520442722559E-004f, 4.81176244777948E-004f}; | |
206 const float float_buehlmann_He_factor_expositon_18_seconds[] = { 1.04710896899039E-001f, 6.65386126706349E-002f, 4.30995968284519E-002f, 2.93106657684409E-002f, 2.01607137751910E-002f, 1.42581599093282E-002f, 1.00776711616688E-002f, 7.11793906429403E-003f, 5.03447255531631E-003f, 3.76069760984632E-003f, 2.93731229281968E-003f, 2.29914783358365E-003f, 1.80203605181650E-003f, 1.40956155658090E-003f, 1.10406577253352E-003f, 8.65950533235460E-004f}; | |
207 const float float_buehlmann_He_factor_expositon_20_seconds[] = { 1.15646523762030E-001f, 7.36529322024796E-002f, 4.77722809133601E-002f, 3.25139075644434E-002f, 2.23755519884017E-002f, 1.58297974422514E-002f, 1.11911244906306E-002f, 7.90568709176287E-003f, 5.59229149279306E-003f, 4.17767891009702E-003f, 3.26314728073529E-003f, 2.55428218017273E-003f, 2.00206171996409E-003f, 1.56605681014277E-003f, 1.22666447811148E-003f, 9.62120958977297E-004f}; | |
208 const float float_buehlmann_He_factor_expositon_one_minute[] = { 3.08363886219441E-001f, 2.05084082411030E-001f, 1.36579295730211E-001f, 9.44046323514587E-002f, 6.56358626478964E-002f, 4.67416115355790E-002f, 3.31990512604121E-002f, 2.35300557146709E-002f, 1.66832281977395E-002f, 1.24807506400979E-002f, 9.75753219809561E-003f, 7.64329013320042E-003f, 5.99416843126677E-003f, 4.69081666943783E-003f, 3.67548116287808E-003f, 2.88358673732592E-003f}; | |
209 const float float_buehlmann_He_factor_expositon_100_second[] = { 4.59084487437744E-001f, 3.17867635141657E-001f, 2.17103957783539E-001f, 1.52336166567559E-001f, 1.06981885584572E-001f, 7.66825160768219E-002f, 5.47171474343117E-002f, 3.89083581201959E-002f, 2.76504642556165E-002f, 2.07145921483078E-002f, 1.62096019995457E-002f, 1.27063337640768E-002f, 9.97030625587825E-003f, 7.80579708939710E-003f, 6.11829377951190E-003f, 4.80135692933603E-003f}; // 100 He | |
210 const float float_buehlmann_He_factor_expositon_five_minutes[]= { 8.41733751018722E-001f, 6.82600697933713E-001f, 5.20142493735619E-001f, 3.90924736715930E-001f, 2.87834706153524E-001f, 2.12857832580192E-001f, 1.55333364924147E-001f, 1.12242395185686E-001f, 8.06788883581406E-002f, 6.08653819753062E-002f, 4.78448115000141E-002f, 3.76366999883051E-002f, 2.96136888654287E-002f, 2.32350754744602E-002f, 1.82428098114835E-002f, 1.43350223887367E-002f}; // thre | |
211 const float float_buehlmann_He_factor_expositon_800_second[] = { 9.92671155759686E-001f, 9.53124140216102E-001f, 8.58865632718416E-001f, 7.33443528431762E-001f, 5.95533881446524E-001f, 4.71787742036413E-001f, 3.62479376011699E-001f, 2.72021750877104E-001f, 2.00940186773410E-001f, 1.54187175639359E-001f, 1.22553521140786E-001f, 9.72431193565182E-002f, 7.70338702477497E-002f, 6.07666995543268E-002f, 4.79109397391700E-002f, 3.77715319879068E-002f}; // 800 He | |
212 const float float_buehlmann_He_factor_expositon_one_hour[]= { 9.99999999753021E-001f, 9.99998954626205E-001f, 9.99850944669188E-001f, 9.97393537149572E-001f, 9.82979603888650E-001f, 9.43423231328217E-001f, 8.68106292901111E-001f, 7.60374619482322E-001f, 6.35576141220644E-001f, 5.29310840978539E-001f, 4.44744511849213E-001f, 3.68942936079581E-001f, 3.02834419265355E-001f, 2.45810174422126E-001f, 1.98231319020275E-001f, 1.59085372294989E-001f}; | |
213 | |
214 void decom_get_inert_gases(const float ambient_pressure_bar,const SGas* pGas, float* fraction_nitrogen, float* fraction_helium ) | |
215 { | |
216 float fraction_all_inertgases; | |
217 float ppo2_fraction_setpoint; | |
218 float diluent_divisor; | |
219 | |
220 | |
221 *fraction_nitrogen = ((float)pGas->nitrogen_percentage) / 100.0f; | |
222 *fraction_helium = ((float)pGas->helium_percentage) / 100.0f; | |
223 | |
224 if(!pGas->setPoint_cbar) | |
225 return; | |
226 | |
227 // continue with CCR | |
228 fraction_all_inertgases = *fraction_nitrogen + *fraction_helium; | |
229 | |
230 ppo2_fraction_setpoint = (float)pGas->setPoint_cbar/ (100 * ambient_pressure_bar); | |
231 | |
232 diluent_divisor = (1.0f - ppo2_fraction_setpoint) / fraction_all_inertgases; | |
233 if(diluent_divisor < 0) | |
234 diluent_divisor = 0; | |
235 | |
236 *fraction_nitrogen *= diluent_divisor; | |
237 *fraction_helium *= diluent_divisor; | |
238 } | |
239 | |
240 | |
241 void decom_tissues_exposure(int period_in_seconds, SLifeData * pLifeData) | |
242 { | |
243 decom_tissues_exposure2(period_in_seconds, &pLifeData->actualGas, pLifeData->pressure_ambient_bar, pLifeData->tissue_nitrogen_bar, pLifeData->tissue_helium_bar); | |
244 } | |
245 | |
246 | |
247 void decom_tissues_exposure2(int period_in_seconds, SGas* pActualGas, float ambiant_pressure_bar, float *tissue_N2_selected_stage, float *tissue_He_selected_stage) | |
248 { | |
249 int ci; | |
250 float percent_N2; | |
251 float percent_He; | |
252 float partial_pressure_N2; | |
253 float partial_pressure_He; | |
254 | |
255 | |
256 | |
257 int period_in_seconds_left; | |
258 | |
57 | 259 if(period_in_seconds > 0) |
260 { | |
38 | 261 |
262 decom_get_inert_gases(ambiant_pressure_bar, pActualGas, &percent_N2, &percent_He); | |
263 | |
264 partial_pressure_N2 = (ambiant_pressure_bar - WATER_VAPOUR_PRESSURE) * percent_N2; | |
265 partial_pressure_He = (ambiant_pressure_bar - WATER_VAPOUR_PRESSURE) * percent_He; | |
57 | 266 period_in_seconds_left = period_in_seconds; |
38 | 267 |
57 | 268 while(period_in_seconds_left) |
269 { | |
270 if(period_in_seconds_left >= 3600) | |
271 period_in_seconds = 3600; | |
272 else | |
273 if(period_in_seconds_left >= 800) | |
274 period_in_seconds = 800; | |
275 else | |
276 if(period_in_seconds_left >= 300) | |
277 period_in_seconds = 300; | |
278 else | |
279 if(period_in_seconds_left >= 100) | |
280 period_in_seconds = 100; | |
281 else | |
282 if(period_in_seconds_left >= 60) | |
283 period_in_seconds = 60; | |
284 else | |
285 if(period_in_seconds_left == 36) | |
286 period_in_seconds = 18; | |
287 else | |
288 if(period_in_seconds_left >= 20) | |
289 period_in_seconds = 20; | |
290 else | |
291 if(period_in_seconds_left >= 18) | |
292 period_in_seconds = 18; | |
293 else | |
294 if(period_in_seconds_left >= 10) | |
295 period_in_seconds = 10; | |
296 else | |
297 if(period_in_seconds_left >= 8) | |
298 period_in_seconds = 8; | |
299 else | |
300 if(period_in_seconds_left >= 3) | |
301 period_in_seconds = 3; | |
302 else | |
303 period_in_seconds = 1; | |
38 | 304 |
57 | 305 period_in_seconds_left -= period_in_seconds; |
38 | 306 |
57 | 307 switch (period_in_seconds) |
38 | 308 { |
57 | 309 case 1: |
310 for (ci=0;ci<16;ci++) | |
311 { | |
312 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_one_second[ci]; | |
313 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_one_second[ci]; | |
314 } | |
315 break; | |
316 case 3: | |
317 for (ci=0;ci<16;ci++) | |
318 { | |
319 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_003_second[ci]; | |
320 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_003_second[ci]; | |
321 } | |
322 break; | |
323 case 8: | |
324 for (ci=0;ci<16;ci++) | |
325 { | |
326 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_008_second[ci]; | |
327 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_008_second[ci]; | |
328 } | |
329 break; | |
330 case 10: | |
331 for (ci=0;ci<16;ci++) | |
332 { | |
333 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_10_seconds[ci]; | |
334 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_10_seconds[ci]; | |
335 } | |
336 break; | |
337 case 18: | |
338 for (ci=0;ci<16;ci++) | |
339 { | |
340 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_18_seconds[ci]; | |
341 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_18_seconds[ci]; | |
342 } | |
343 break; | |
344 case 20: | |
345 for (ci=0;ci<16;ci++) | |
346 { | |
347 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_20_seconds[ci]; | |
348 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_20_seconds[ci]; | |
349 } | |
350 break; | |
351 case 60: | |
352 for (ci=0;ci<16;ci++) | |
353 { | |
354 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_one_minute[ci]; | |
355 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_one_minute[ci]; | |
356 } | |
357 break; | |
358 case 100: | |
359 for (ci=0;ci<16;ci++) | |
360 { | |
361 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_100_second[ci]; | |
362 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_100_second[ci]; | |
363 } | |
364 break; | |
365 case 300: | |
366 for (ci=0;ci<16;ci++) | |
367 { | |
368 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_five_minutes[ci]; | |
369 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_five_minutes[ci]; | |
370 } | |
371 break; | |
372 case 800: | |
373 for (ci=0;ci<16;ci++) | |
374 { | |
375 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_800_second[ci]; | |
376 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_800_second[ci]; | |
377 } | |
378 break; | |
379 case 3600: | |
380 for (ci=0;ci<16;ci++) | |
381 { | |
382 tissue_N2_selected_stage[ci] += (partial_pressure_N2 - tissue_N2_selected_stage[ci]) * float_buehlmann_N2_factor_expositon_one_hour[ci]; | |
383 tissue_He_selected_stage[ci] += (partial_pressure_He - tissue_He_selected_stage[ci]) * float_buehlmann_He_factor_expositon_one_hour[ci]; | |
384 } | |
385 break; | |
38 | 386 } |
387 } | |
388 } | |
389 } | |
390 | |
391 void decom_reset_with_1000mbar(SLifeData * pLifeData) | |
392 { | |
393 double saturation = 1.0; | |
394 | |
395 saturation -= WATER_VAPOUR_PRESSURE; | |
396 saturation *= FRACTION_N2_AIR; | |
397 | |
398 for(int i=0;i<16;i++) | |
399 { | |
400 pLifeData->tissue_nitrogen_bar[i] = saturation; | |
401 pLifeData->tissue_helium_bar[i] = 0; | |
402 } | |
403 pLifeData->otu = 0; | |
404 pLifeData->cns = 0; | |
405 pLifeData->desaturation_time_minutes = 0; | |
406 pLifeData->no_fly_time_minutes = 0; | |
407 } | |
408 | |
129
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409 void decom_reset_with_ambientmbar(float ambient, SLifeData * pLifeData) |
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410 { |
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411 |
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412 float saturation = 1.0; |
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413 saturation = ambient; |
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414 saturation -= WATER_VAPOUR_PRESSURE; |
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415 saturation *= FRACTION_N2_AIR; |
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416 |
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417 for(int i=0;i<16;i++) |
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418 { |
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419 pLifeData->tissue_nitrogen_bar[i] = saturation; |
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420 pLifeData->tissue_helium_bar[i] = 0; |
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421 } |
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422 pLifeData->otu = 0; |
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423 pLifeData->cns = 0; |
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424 pLifeData->desaturation_time_minutes = 0; |
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425 pLifeData->no_fly_time_minutes = 0; |
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426 } |
38 | 427 |
428 /* =============================================================================== */ | |
429 /* NOTE ABOUT PRESSURE UNITS USED IN CALCULATIONS: */ | |
430 /* It is the convention in decompression calculations to compute all gas */ | |
431 /* loadings, absolute pressures, partial pressures, etc., in the units of */ | |
432 /* depth pressure that you are diving - either feet of seawater (fsw) or */ | |
433 /* meters of seawater (msw). This program follows that convention with the */ | |
434 /* the exception that all VPM calculations are performed in SI units (by */ | |
435 /* necessity). Accordingly, there are several conversions back and forth */ | |
436 /* between the diving pressure units and the SI units. */ | |
437 /* =============================================================================== */ | |
438 /* =============================================================================== */ | |
439 /* FUNCTION SUBPROGRAM FOR GAS LOADING CALCULATIONS - ASCENT AND DESCENT */ | |
440 /* =============================================================================== */ | |
441 | |
442 | |
443 float decom_schreiner_equation(float *initial_inspired_gas_pressure, | |
444 float *rate_change_insp_gas_pressure, | |
445 float *interval_time_minutes, | |
446 const float *gas_time_constant, | |
447 float *initial_gas_pressure) | |
448 { | |
449 /* System generated locals */ | |
450 float ret_val; | |
451 float time_null_pressure = 0.0f; | |
452 float time_rest = 0.0f; | |
453 float time = *interval_time_minutes; | |
454 /* =============================================================================== */ | |
455 /* Note: The Schreiner equation is applied when calculating the uptake or */ | |
456 /* elimination of compartment gases during linear ascents or descents at a */ | |
457 /* constant rate. For ascents, a negative number for rate must be used. */ | |
458 /* =============================================================================== */ | |
459 if( *rate_change_insp_gas_pressure < 0.0f) | |
460 { | |
461 time_null_pressure = -1.0f * *initial_inspired_gas_pressure / *rate_change_insp_gas_pressure; | |
462 if(time > time_null_pressure ) | |
463 { | |
464 time_rest = time - time_null_pressure; | |
465 time = time_null_pressure; | |
466 } | |
467 } | |
468 ret_val = | |
469 *initial_inspired_gas_pressure + | |
470 *rate_change_insp_gas_pressure * | |
471 (time - 1.f / *gas_time_constant) - | |
472 (*initial_inspired_gas_pressure - | |
473 *initial_gas_pressure - | |
474 *rate_change_insp_gas_pressure / *gas_time_constant) * | |
475 expf(-(*gas_time_constant) * time); | |
476 | |
477 if(time_rest > 0.0f) | |
478 { | |
479 ret_val = ret_val * expf(-(*gas_time_constant) * time_rest); | |
480 } | |
481 | |
482 | |
483 return ret_val; | |
484 }; /* schreiner_equation__2 */ | |
485 | |
486 void decom_tissues_exposure_stage_schreiner(int period_in_seconds, SGas* pGas, float starting_ambient_pressure_bar, float ending_ambient_pressure_bar, | |
487 float* pTissue_nitrogen_bar, float* pTissue_helium_bar) | |
488 { | |
489 | |
490 float initial_pressure_N2; | |
491 float initial_pressure_He; | |
492 | |
493 float ending_pressure_N2; | |
494 float ending_pressure_He; | |
495 | |
496 float fraction_N2_begin; | |
497 float fraction_N2_end; | |
498 float fraction_He_begin; | |
499 float fraction_He_end; | |
500 | |
501 float rate_N2; | |
502 float rate_He; | |
503 | |
504 float period_in_minutes; | |
505 | |
506 int ci; | |
507 | |
508 if(period_in_seconds <= 0) | |
509 return; | |
510 | |
511 decom_get_inert_gases(starting_ambient_pressure_bar, pGas, &fraction_N2_begin, &fraction_He_begin ); | |
512 decom_get_inert_gases(ending_ambient_pressure_bar, pGas, &fraction_N2_end, &fraction_He_end ); | |
513 | |
514 initial_pressure_N2 = (starting_ambient_pressure_bar - WATER_VAPOUR_PRESSURE) * fraction_N2_begin; | |
515 initial_pressure_He = (starting_ambient_pressure_bar - WATER_VAPOUR_PRESSURE) * fraction_He_begin; | |
516 | |
517 ending_pressure_N2 = (ending_ambient_pressure_bar - WATER_VAPOUR_PRESSURE) * fraction_N2_end; | |
518 ending_pressure_He = (ending_ambient_pressure_bar - WATER_VAPOUR_PRESSURE) * fraction_He_end; | |
519 | |
520 rate_N2 = (ending_pressure_N2 - initial_pressure_N2) / period_in_seconds; | |
521 rate_He = (ending_pressure_He - initial_pressure_He) / period_in_seconds; | |
522 | |
523 period_in_minutes = ((float)period_in_seconds) / 60.0f; | |
524 | |
525 for (ci=0;ci<16;ci++) | |
526 { | |
527 pTissue_nitrogen_bar[ci] = | |
528 decom_schreiner_equation( | |
529 &initial_pressure_N2, | |
530 &rate_N2, | |
531 &period_in_minutes, | |
532 &nitrogen_time_constant[ci], | |
533 &pTissue_nitrogen_bar[ci]); | |
534 | |
535 pTissue_helium_bar[ci] = | |
536 decom_schreiner_equation( | |
537 &initial_pressure_He, | |
538 &rate_He, | |
539 &period_in_minutes, | |
540 &helium_time_constant[ci], | |
541 &pTissue_helium_bar[ci]); | |
542 } | |
543 } | |
544 | |
545 _Bool nextSetpointChange(SDiveSettings* pDiveSettings, uint8_t depth_meter, uint8_t* change_depth_meter, char* setpoint) | |
546 { | |
547 uint8_t new_depth = 0; | |
548 char new_setpoint = 0; | |
549 for(int i = 1; i <= 5; i++) | |
550 { | |
551 if(pDiveSettings->setpoint[i].setpoint_cbar > 0 && pDiveSettings->setpoint[i].depth_meter > 0 ) | |
552 { | |
553 if( pDiveSettings->setpoint[i].depth_meter > new_depth && pDiveSettings->setpoint[i].depth_meter < depth_meter) | |
554 { | |
555 new_depth = pDiveSettings->setpoint[i].depth_meter; | |
556 new_setpoint = pDiveSettings->setpoint[i].setpoint_cbar; | |
557 } | |
558 } | |
559 } | |
560 if(new_depth) | |
561 { | |
562 * change_depth_meter = new_depth; | |
563 * setpoint = new_setpoint; | |
564 return 1; | |
565 } | |
566 return 0; | |
567 } | |
568 | |
569 | |
570 | |
571 void decom_CreateGasChangeList(SDiveSettings* pInput, const SLifeData* pLifeData) | |
572 { | |
573 int i=0, j = 0; | |
574 int count = 0; | |
575 for(i=0;i< 5;i++) | |
576 { | |
577 //FirstGas | |
578 | |
579 pInput->decogaslist[i].change_during_ascent_depth_meter_otherwise_zero = 0; | |
580 pInput->decogaslist[i].GasIdInSettings = 255; | |
581 pInput->decogaslist[i].setPoint_cbar = 0; | |
582 pInput->decogaslist[i].helium_percentage = 0; | |
583 pInput->decogaslist[i].nitrogen_percentage = 0; | |
584 } | |
585 //pInput->liveData.dive_time_seconds = 0; | |
586 | |
587 /* FirstGas | |
588 * 0 = special gas, 1 to 5 ist OC gas, 6 to 10 is diluent | |
589 */ | |
590 | |
591 | |
592 | |
593 pInput->decogaslist[0] = pLifeData->actualGas; | |
594 | |
595 /* Add Deco Gases | |
596 * special (gasId == 0) is never a deco/travel gas but actual gas only | |
597 */ | |
598 if(pInput->diveMode == DIVEMODE_OC) | |
599 { | |
600 | |
601 for(i=1;i<= 5;i++) | |
602 { | |
603 if(pInput->gas[i].note.ub.active && pInput->gas[i].depth_meter | |
604 && (pLifeData->actualGas.GasIdInSettings != i) | |
605 &&(pInput->gas[i].depth_meter < pLifeData->depth_meter ) ) | |
606 { | |
607 count = 1; | |
608 for(j=1;j<= 5;j++) | |
609 { | |
610 if( (pInput->gas[j].note.ub.active && pInput->gas[j].depth_meter > 0) | |
611 && (pLifeData->actualGas.GasIdInSettings != j) // new hw 160905 | |
612 && (pInput->gas[j].depth_meter > pInput->gas[i].depth_meter)) | |
613 count++; | |
614 } | |
615 pInput->decogaslist[count].change_during_ascent_depth_meter_otherwise_zero = pInput->gas[i].depth_meter; | |
616 pInput->decogaslist[count].nitrogen_percentage = 100; | |
617 pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].oxygen_percentage; | |
618 pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].helium_percentage; | |
619 pInput->decogaslist[count].helium_percentage = pInput->gas[i].helium_percentage; | |
620 pInput->decogaslist[count].GasIdInSettings = i; | |
621 | |
622 } | |
623 } | |
624 } | |
625 else | |
626 { | |
627 //divmode CCR | |
628 for(i=6; i <= 10; i++) | |
629 { | |
630 if(pInput->gas[i].note.ub.active && pInput->gas[i].depth_meter | |
631 && (pLifeData->actualGas.GasIdInSettings != i) | |
632 &&(pInput->gas[i].depth_meter < pLifeData->depth_meter ) ) | |
633 { | |
634 count = 1; | |
635 for(j=6;j<= 10;j++) | |
636 { | |
637 // if(pInput->gas[j].note.ub.active && pInput->gas[j].depth_meter > 0 &&pInput->gas[j].depth_meter > pInput->gas[i].depth_meter) | |
638 if( (pInput->gas[j].note.ub.active && pInput->gas[j].depth_meter > 0) | |
639 && (pLifeData->actualGas.GasIdInSettings != j) // new hw 160905 | |
640 && (pInput->gas[j].depth_meter > pInput->gas[i].depth_meter)) | |
641 count++; | |
642 } | |
643 pInput->decogaslist[count].change_during_ascent_depth_meter_otherwise_zero = pInput->gas[i].depth_meter; | |
644 pInput->decogaslist[count].nitrogen_percentage = 100; | |
645 pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].oxygen_percentage; | |
646 pInput->decogaslist[count].nitrogen_percentage -= pInput->gas[i].helium_percentage; | |
647 pInput->decogaslist[count].helium_percentage = pInput->gas[i].helium_percentage; | |
648 pInput->decogaslist[count].GasIdInSettings = i; | |
649 | |
650 } | |
651 } | |
652 /* Include Setpoint Changes */ | |
653 for(j=0; j <= count; j++) | |
654 { | |
655 uint8_t depth = 0; | |
656 uint8_t changedepth = 0; | |
657 char newSetpoint; | |
658 if(j == 0) | |
659 { | |
660 depth = pLifeData->depth_meter; | |
661 } | |
662 else | |
663 { | |
664 //no setpointchange ? | |
665 pInput->decogaslist[j].setPoint_cbar = pInput->decogaslist[j - 1].setPoint_cbar; | |
666 depth = pInput->decogaslist[j].change_during_ascent_depth_meter_otherwise_zero + 0.1f; | |
667 } | |
668 /* Setpoint change at the same depth as gas changes */ | |
669 if(nextSetpointChange(pInput,depth + 1, &changedepth,&newSetpoint) && changedepth == depth) | |
670 { | |
671 pInput->decogaslist[j].setPoint_cbar = newSetpoint; | |
672 } | |
673 /* Setpoint changes inbetween gas changes */ | |
674 while(nextSetpointChange(pInput, depth, &changedepth,&newSetpoint) | |
675 && ( | |
676 ( (j < count) && (changedepth > pInput->decogaslist[j + 1].change_during_ascent_depth_meter_otherwise_zero)) | |
677 || ((j == count) && (changedepth > 0)) | |
678 )) | |
679 { | |
680 //Include new entry with setpoint change in decogaslist | |
681 for(int k = count; k > j; k--) | |
682 { | |
683 pInput->decogaslist[k+1] = pInput->decogaslist[k]; | |
684 } | |
685 pInput->decogaslist[j + 1] = pInput->decogaslist[j]; | |
686 pInput->decogaslist[j + 1].setPoint_cbar = newSetpoint; | |
687 j++; | |
688 count++; | |
689 depth = changedepth; | |
690 } | |
691 | |
692 } | |
693 | |
694 } | |
695 } | |
696 void test_decom_CreateGasChangeList(void) | |
697 { | |
698 SDiveSettings diveSetting; | |
699 SLifeData lifeData; | |
700 lifeData.depth_meter = 100; | |
701 lifeData.actualGas.helium_percentage = 30; | |
702 lifeData.actualGas.nitrogen_percentage = 60; | |
703 lifeData.actualGas.setPoint_cbar = 18; | |
704 lifeData.actualGas.GasIdInSettings = 0; | |
705 lifeData.actualGas.change_during_ascent_depth_meter_otherwise_zero = 0; | |
706 diveSetting.diveMode = DIVEMODE_CCR; | |
707 diveSetting.gas[6].depth_meter = 0; | |
708 diveSetting.gas[6].helium_percentage = 30; | |
709 diveSetting.gas[6].oxygen_percentage = 10; | |
710 diveSetting.gas[6].note.ub.active = 1; | |
711 | |
712 diveSetting.gas[7].depth_meter = 60; | |
713 diveSetting.gas[7].helium_percentage = 0; | |
714 diveSetting.gas[7].oxygen_percentage = 10; | |
715 diveSetting.gas[7].note.ub.active = 1; | |
716 diveSetting.gas[8].note.ub.active = 0; | |
717 diveSetting.gas[9].note.ub.active = 0; | |
718 diveSetting.gas[10].note.ub.active = 0; | |
719 | |
720 diveSetting.setpoint[0].depth_meter = 0; | |
721 diveSetting.setpoint[1].depth_meter = 80; | |
722 diveSetting.setpoint[1].setpoint_cbar = 20; | |
723 diveSetting.setpoint[2].depth_meter = 60; | |
724 diveSetting.setpoint[2].setpoint_cbar = 25; | |
725 diveSetting.setpoint[3].depth_meter = 0; | |
726 diveSetting.setpoint[4].depth_meter = 0; | |
727 diveSetting.setpoint[5].depth_meter = 0; | |
728 | |
729 | |
730 decom_CreateGasChangeList(&diveSetting, &lifeData); | |
731 } | |
732 | |
733 uint8_t decom_tissue_test_tolerance(float* Tissue_nitrogen_bar, float* Tissue_helium_bar, float GF_value, float depth_in_bar_absolute) | |
734 { | |
735 float tissue_inertgas_saturation; | |
736 float inertgas_a; | |
737 float inertgas_b; | |
738 float inertgas_tolerance; | |
739 float gf_minus_1; | |
740 | |
741 gf_minus_1 = GF_value - 1.0f; | |
742 | |
743 for (int ci = 0; ci < 16; ci++) | |
744 { | |
745 if(Tissue_helium_bar[ci] == 0) | |
746 { | |
747 tissue_inertgas_saturation = Tissue_nitrogen_bar[ci]; | |
748 // | |
749 inertgas_a = buehlmann_N2_a[ci]; | |
750 inertgas_b = buehlmann_N2_b[ci]; | |
751 } | |
752 else | |
753 { | |
754 tissue_inertgas_saturation = Tissue_nitrogen_bar[ci] + Tissue_helium_bar[ci]; | |
755 // | |
756 inertgas_a = ( ( buehlmann_N2_a[ci] * Tissue_nitrogen_bar[ci]) + ( buehlmann_He_a[ci] * Tissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
757 inertgas_b = ( ( buehlmann_N2_b[ci] * Tissue_nitrogen_bar[ci]) + ( buehlmann_He_b[ci] * Tissue_helium_bar[ci]) ) / tissue_inertgas_saturation; | |
758 } | |
759 // | |
760 inertgas_tolerance = ( (GF_value / inertgas_b - gf_minus_1) * depth_in_bar_absolute ) + ( GF_value * inertgas_a ); | |
761 // | |
762 if(inertgas_tolerance < tissue_inertgas_saturation) | |
763 return 0; | |
764 } | |
765 return 1; | |
766 } | |
767 | |
768 | |
769 void decom_tissues_desaturation_time(const SLifeData* pLifeData, SLifeData2* pOutput) | |
770 { | |
771 float pressure_in_gas_for_complete; | |
772 float pressure_in_gas_for_desat; | |
773 float diff_to_complete; | |
774 float diff_to_desatpoint; | |
775 float necessary_halftimes; | |
776 float desattime; | |
777 | |
778 pressure_in_gas_for_complete = 0.7902f * ( pLifeData->pressure_surface_bar - 0.0627f); | |
779 pressure_in_gas_for_desat = 1.05f * pressure_in_gas_for_complete; | |
780 for(int i=0; i<16; i++) | |
781 { | |
782 diff_to_complete = pressure_in_gas_for_complete - pLifeData->tissue_nitrogen_bar[i]; | |
783 diff_to_desatpoint = pressure_in_gas_for_desat - pLifeData->tissue_nitrogen_bar[i]; | |
784 | |
785 if((diff_to_desatpoint >= 0) || (diff_to_complete >= 0)) | |
786 pOutput->tissue_nitrogen_desaturation_time_minutes[i] = 0; | |
787 else | |
788 { | |
789 necessary_halftimes = (logf(1.0f - (diff_to_desatpoint/diff_to_complete)) / -0.6931f); | |
790 desattime = buehlmann_N2_t_halflife[i] * necessary_halftimes; | |
791 if(desattime <= (float)0xFFFF) | |
792 pOutput->tissue_nitrogen_desaturation_time_minutes[i] = desattime; | |
793 else | |
794 pOutput->tissue_nitrogen_desaturation_time_minutes[i] = 0xFFFF; | |
795 } | |
796 } | |
797 | |
798 for(int i=0; i<16; i++) | |
799 { | |
800 diff_to_desatpoint = 0.05f - pLifeData->tissue_helium_bar[i]; | |
801 diff_to_complete = -1.0f * pLifeData->tissue_helium_bar[i]; | |
802 | |
803 if((diff_to_desatpoint >= 0) || (diff_to_complete >= 0)) | |
804 pOutput->tissue_helium_desaturation_time_minutes[i] = 0; | |
805 else | |
806 { | |
807 necessary_halftimes = (logf(1.0f - (diff_to_desatpoint/diff_to_complete)) / -0.6931f); | |
808 desattime = buehlmann_He_t_halflife[i] * necessary_halftimes; | |
809 if(desattime <= (float)0xFFFF) | |
810 pOutput->tissue_helium_desaturation_time_minutes[i] = desattime; | |
811 else | |
812 pOutput->tissue_helium_desaturation_time_minutes[i] = 0xFFFF; | |
813 } | |
814 } | |
815 } | |
816 | |
817 #define MAX_DEGRADE_OTU_TIME_MINUTES (1440) | |
818 //CNS&OTU: | |
819 #define OXY_TEN_MINUTES_IN_SECONDS (600) | |
820 #define OXY_HALF_LIVE_OF_TEN_MINUTES__INVERSE_NINTH_ROOT_OF_TWO (0.92587471f) | |
821 #define OXY_NINE_DAYS_IN_TEN_MINUTES (1296) | |
822 #define OXY_ONE_SIXTIETH_PART (0.0166667f) | |
823 #define OXY_NEGATIVE_FIVE_SIXTH_PARTS (-0.8333333f) | |
824 void decom_oxygen_calculate_otu(float* oxygen_otu, float pressure_oxygen_real) | |
825 { | |
826 if(pressure_oxygen_real <= 0.5f) | |
827 return; | |
828 *oxygen_otu += (pow((double)(0.5f / (pressure_oxygen_real - 0.5f)),OXY_NEGATIVE_FIVE_SIXTH_PARTS)) * OXY_ONE_SIXTIETH_PART; | |
829 } | |
830 | |
831 void decom_oxygen_calculate_otu_degrade(float* oxygen_otu, long seconds_since_last_dive) | |
832 { | |
833 static long otu_time_ticker = 0; | |
834 static double otu_degrade_every_10_minutes = 999.9; | |
835 long cycles_since_last_call; | |
836 | |
837 if((*oxygen_otu <= 0) || (seconds_since_last_dive == 0)) | |
838 *oxygen_otu = 0; | |
839 else if(seconds_since_last_dive < OXY_TEN_MINUTES_IN_SECONDS) | |
840 { | |
841 otu_time_ticker = 1; | |
842 otu_degrade_every_10_minutes = *oxygen_otu / (MAX_DEGRADE_OTU_TIME_MINUTES / 10); | |
843 } | |
844 else | |
845 { | |
846 cycles_since_last_call = seconds_since_last_dive / (otu_time_ticker * OXY_TEN_MINUTES_IN_SECONDS); | |
847 *oxygen_otu -= ((double)cycles_since_last_call) * otu_degrade_every_10_minutes; | |
848 otu_time_ticker += cycles_since_last_call; | |
849 if((*oxygen_otu < 0) || (otu_time_ticker > (MAX_DEGRADE_OTU_TIME_MINUTES / 10))) | |
850 *oxygen_otu = 0; | |
851 } | |
852 } | |
853 | |
854 | |
855 | |
856 void decom_oxygen_calculate_cns_degrade(float* oxygen_cns, long seconds_since_last_dive) | |
857 { | |
858 static long cns_time_ticker = 0; | |
859 int cns_max_cycles; | |
860 | |
861 if((*oxygen_cns <= 0.5f) || (seconds_since_last_dive == 0)) | |
862 *oxygen_cns = 0; | |
863 else if(seconds_since_last_dive < OXY_TEN_MINUTES_IN_SECONDS) | |
864 cns_time_ticker = 1; | |
865 else | |
866 { | |
867 cns_max_cycles = OXY_NINE_DAYS_IN_TEN_MINUTES; | |
868 while((*oxygen_cns >= 0.5f) && ((cns_time_ticker * OXY_TEN_MINUTES_IN_SECONDS) < seconds_since_last_dive) && cns_max_cycles) | |
869 { | |
870 cns_time_ticker++; | |
871 cns_max_cycles--; | |
872 *oxygen_cns *= OXY_HALF_LIVE_OF_TEN_MINUTES__INVERSE_NINTH_ROOT_OF_TWO; | |
873 } | |
874 } | |
875 } | |
876 | |
877 | |
878 // new hwOS style | |
879 void decom_oxygen_calculate_cns(float* oxygen_cns, float pressure_oxygen_real) | |
880 { | |
881 uint8_t char_I_actual_ppO2; | |
882 float CNS_fraction = 0; | |
883 const float time_factor = 3000.0f; | |
884 | |
885 if(pressure_oxygen_real < 0.15f) | |
886 char_I_actual_ppO2 = 15; | |
887 else | |
888 if(pressure_oxygen_real >= 2.5f) | |
889 char_I_actual_ppO2 = 255; | |
890 else | |
891 char_I_actual_ppO2 = (uint8_t)(pressure_oxygen_real * 100); | |
892 | |
893 if (char_I_actual_ppO2 < 50) | |
894 (void)0; // no changes | |
895 //------------------------------------------------------------------------ | |
896 // Below (and including) 1.60 bar | |
897 else if (char_I_actual_ppO2 < 61) | |
898 CNS_fraction += time_factor/(-533.07f * char_I_actual_ppO2 + 54000.0f); | |
899 else if (char_I_actual_ppO2 < 71) | |
900 CNS_fraction += time_factor/(-444.22f * char_I_actual_ppO2 + 48600.0f); | |
901 else if (char_I_actual_ppO2 < 81) | |
902 CNS_fraction += time_factor/(-355.38f * char_I_actual_ppO2 + 42300.0f); | |
903 else if (char_I_actual_ppO2 < 91) | |
904 CNS_fraction += time_factor/(-266.53f * char_I_actual_ppO2 + 35100.0f); | |
905 else if (char_I_actual_ppO2 < 111) | |
906 CNS_fraction += time_factor/(-177.69f * char_I_actual_ppO2 + 27000.0f); | |
907 else if (char_I_actual_ppO2 < 152) | |
908 CNS_fraction += time_factor/( -88.84f * char_I_actual_ppO2 + 17100.0f); | |
909 else if (char_I_actual_ppO2 < 167) | |
910 CNS_fraction += time_factor/(-222.11f * char_I_actual_ppO2 + 37350.0f); | |
911 //------------------------------------------------------------------------ | |
912 // Arieli et all.(2002): Modeling pulmonary and CNS O2 toxicity: | |
913 // J Appl Physiol 92: 248--256, 2002, doi:10.1152/japplphysiol.00434.2001 | |
914 // Formula (A1) based on value for 1.55 and c=20 | |
915 // example calculation: Sqrt((1.7/1.55)^20)*0.000404 | |
916 else if (char_I_actual_ppO2 < 172) | |
917 CNS_fraction += time_factor*0.00102f; | |
918 else if (char_I_actual_ppO2 < 177) | |
919 CNS_fraction += time_factor*0.00136f; | |
920 else if (char_I_actual_ppO2 < 182) | |
921 CNS_fraction += time_factor*0.00180f; | |
922 else if (char_I_actual_ppO2 < 187) | |
923 CNS_fraction += time_factor*0.00237f; | |
924 else if (char_I_actual_ppO2 < 192) | |
925 CNS_fraction += time_factor*0.00310f; | |
926 else if (char_I_actual_ppO2 < 198) | |
927 CNS_fraction += time_factor*0.00401f; | |
928 else if (char_I_actual_ppO2 < 203) | |
929 CNS_fraction += time_factor*0.00517f; | |
930 else if (char_I_actual_ppO2 < 233) | |
931 CNS_fraction += time_factor*0.0209f; | |
932 else | |
933 CNS_fraction += time_factor*0.0482f; // value for 2.5 | |
934 | |
935 if( CNS_fraction > 999.0f) // Limit display to 999% | |
936 CNS_fraction = 999.0f; | |
937 if( CNS_fraction < 0.0f ) | |
938 CNS_fraction = 0.0f; | |
939 | |
940 //calculate cns for the actual ppo2 for 1 second | |
941 *oxygen_cns += OXY_ONE_SIXTIETH_PART * CNS_fraction; | |
942 | |
943 if( *oxygen_cns > 999.0f) // Limit display to 999% | |
944 *oxygen_cns = 999.0f; | |
945 if( *oxygen_cns < 0.0f ) | |
946 *oxygen_cns = 0.0f; | |
947 } | |
948 | |
949 /* old DR5 style | |
950 void decom_oxygen_calculate_cns(float* oxygen_cns, float pressure_oxygen_real) | |
951 { | |
952 int cns_no_range = 0; | |
953 _Bool not_found = 1; | |
954 //for the cns calculation | |
955 const float cns_ppo2_ranges[60][2] = { | |
956 {0.50f, 0.00f}, {0.60f, 0.14f}, {0.64f, 0.15f}, {0.66f, 0.16f}, {0.68f, 0.17f}, {0.70f, 0.18f}, | |
957 {0.74f, 0.19f}, {0.76f, 0.20f}, {0.78f, 0.21f}, {0.80f, 0.22f}, {0.82f, 0.23f}, {0.84f, 0.24f}, | |
958 {0.86f, 0.25f}, {0.88f, 0.26f}, {0.90f, 0.28f}, {0.92f, 0.29f}, {0.94f, 0.30f}, {0.96f, 0.31f}, | |
959 {0.98f, 0.32f}, {1.00f, 0.33f}, {1.02f, 0.35f}, {1.04f, 0.36f}, {1.06f, 0.38f}, {1.08f, 0.40f}, | |
960 {1.10f, 0.42f}, {1.12f, 0.43f}, {1.14f, 0.43f}, {1.16f, 0.44f}, {1.18f, 0.46f}, {1.20f, 0.47f}, | |
961 {1.22f, 0.48f}, {1.24f, 0.51f}, {1.26f, 0.52f}, {1.28f, 0.54f}, {1.30f, 0.56f}, {1.32f, 0.57f}, | |
962 {1.34f, 0.60f}, {1.36f, 0.62f}, {1.38f, 0.63f}, {1.40f, 0.65f}, {1.42f, 0.68f}, {1.44f, 0.71f}, | |
963 {1.46f, 0.74f}, {1.48f, 0.78f}, {1.50f, 0.83f}, {1.52f, 0.93f}, {1.54f, 1.04f}, {1.56f, 1.19f}, | |
964 {1.58f, 1.47f}, {1.60f, 2.22f}, {1.62f, 5.00f}, {1.65f, 6.25f}, {1.67f, 7.69f}, {1.70f, 10.0f}, | |
965 {1.72f,12.50f}, {1.74f,20.00f}, {1.77f,25.00f}, {1.79f,31.25f}, {1.80f,50.00f}, {1.82f,100.0f}}; | |
966 //find the correct cns range for the corresponding ppo2 | |
967 cns_no_range = 58; | |
968 while (cns_no_range && not_found) | |
969 { | |
970 if (pressure_oxygen_real > cns_ppo2_ranges[cns_no_range][0]) | |
971 { | |
972 cns_no_range++; | |
973 not_found = 0; | |
974 } | |
975 else | |
976 cns_no_range--; | |
977 } | |
978 | |
979 //calculate cns for the actual ppo2 for 1 second | |
980 *oxygen_cns += OXY_ONE_SIXTIETH_PART * cns_ppo2_ranges[cns_no_range][1]; | |
981 } | |
982 */ | |
983 | |
984 void decom_oxygen_calculate_cns_exposure(int period_in_seconds, SGas* pActualGas, float pressure_ambient_bar, float* oxygen_cns) | |
985 { | |
986 float pressure_oxygen_real; | |
987 float one_second_cns; | |
988 | |
989 pressure_oxygen_real = decom_calc_ppO2(pressure_ambient_bar, pActualGas); | |
990 one_second_cns = 0; | |
991 decom_oxygen_calculate_cns(&one_second_cns, pressure_oxygen_real); | |
992 *oxygen_cns += one_second_cns * period_in_seconds; | |
993 } | |
994 | |
995 | |
996 void decom_oxygen_calculate_cns_stage_SchreinerStyle(int period_in_seconds, SGas* pGas, float starting_ambient_pressure_bar, float ending_ambient_pressure_bar, float* oxygen_cns) | |
997 { | |
998 if(ending_ambient_pressure_bar == starting_ambient_pressure_bar) | |
999 { | |
1000 decom_oxygen_calculate_cns_exposure(period_in_seconds, pGas, starting_ambient_pressure_bar, oxygen_cns); | |
1001 return; | |
1002 } | |
1003 | |
1004 float pressure_oxygen_real; | |
1005 float initial_pressure_oxygen; | |
1006 float ending_pressure_oxygen; | |
1007 float rate_oxygen; | |
1008 | |
1009 initial_pressure_oxygen = decom_calc_ppO2(starting_ambient_pressure_bar, pGas); | |
1010 ending_pressure_oxygen = decom_calc_ppO2(ending_ambient_pressure_bar, pGas); | |
1011 | |
1012 rate_oxygen = (ending_pressure_oxygen - initial_pressure_oxygen) / period_in_seconds; | |
1013 | |
1014 pressure_oxygen_real = initial_pressure_oxygen; | |
1015 for(int i = 0; i < period_in_seconds; i++) | |
1016 { | |
1017 decom_oxygen_calculate_cns(oxygen_cns, pressure_oxygen_real); | |
1018 pressure_oxygen_real += rate_oxygen; | |
1019 } | |
1020 } | |
1021 | |
1022 | |
1023 float decom_calc_ppO2(const float ambiant_pressure_bar, const SGas* pGas) | |
1024 { | |
1025 float percent_N2 = 0; | |
1026 float percent_He = 0; | |
1027 float percent_O2 = 0; | |
1028 decom_get_inert_gases(ambiant_pressure_bar, pGas, &percent_N2, &percent_He); | |
1029 percent_O2 = 1 - percent_N2 - percent_He; | |
1030 | |
1031 return (ambiant_pressure_bar - WATER_VAPOUR_PRESSURE) * percent_O2; | |
1032 } | |
1033 | |
1034 | |
1035 uint8_t decom_get_actual_deco_stop(SDiveState* pDiveState) | |
1036 { | |
1037 SDecoinfo* pDecoinfo; | |
1038 uint8_t depthNext, depthLast, depthSecond, depthInc; | |
1039 if(pDiveState->diveSettings.deco_type.ub.standard == GF_MODE) | |
1040 pDecoinfo = &pDiveState->decolistBuehlmann; | |
1041 else | |
1042 pDecoinfo = &pDiveState->decolistVPM; | |
1043 | |
1044 depthLast = (uint8_t)(pDiveState->diveSettings.last_stop_depth_bar * 10); | |
1045 depthSecond = (uint8_t)(pDiveState->diveSettings.input_second_to_last_stop_depth_bar * 10); | |
1046 depthInc = (uint8_t)(pDiveState->diveSettings.input_next_stop_increment_depth_bar * 10); | |
1047 if(pDecoinfo->output_stop_length_seconds[0] > 0) | |
1048 { | |
1049 depthNext = depthLast; | |
1050 } | |
1051 else | |
1052 return 0; | |
1053 for(int i = DECOINFO_STRUCT_MAX_STOPS -1 ;i > 0; i--) | |
1054 { | |
1055 if(pDecoinfo->output_stop_length_seconds[i] > 0) | |
1056 { | |
1057 depthNext = depthSecond + ( (i - 1) * depthInc); | |
1058 break; | |
1059 } | |
1060 } | |
1061 return depthNext; | |
1062 } | |
1063 | |
1064 | |
1065 // =============================================================================== | |
1066 // decom_calc_desaturation_time | |
1067 /// @brief This code is used to calculate desat, calculated by RTE and send to Firmware | |
1068 /// similar but more technical in code than decom_tissues_desaturation_time() | |
1069 /// the later has 0.05 for helium in contrast to this one. | |
1070 /// This one goes down to 70%, the oterh | |
1071 /// | |
1072 /// output is desat time in minutes | |
1073 // =============================================================================== | |
1074 int decom_calc_desaturation_time(float* Tissue_nitrogen_bar, float* Tissue_helium_bar, float surface_pressure_bar) | |
1075 { | |
1076 const float N2_ratio = 0.7902; // FIXED sum as stated in b"uhlmann | |
1077 | |
1078 float pres_surface; | |
1079 float temp_atem; | |
1080 float float_desaturation_multiplier; | |
1081 float temp1,temp2,temp3,temp4; | |
1082 int ci; | |
1083 int int_temp; | |
1084 int int_O_desaturation_time; | |
1085 pres_surface = ((float)surface_pressure_bar); | |
1086 temp_atem = N2_ratio * (pres_surface - 0.0627f); | |
1087 | |
1088 int_O_desaturation_time = 0; | |
1089 float_desaturation_multiplier = 100 / 142.0f; // new in v.101 (70,42%/100.=142) | |
1090 | |
1091 for (ci=0;ci<16;ci++) | |
1092 { | |
1093 // saturation_time (for flight) and N2_saturation in multiples of halftime | |
1094 // version v.100: 1.1 = 10 percent distance to totally clean (totally clean is not possible, would take infinite time ) | |
1095 // new in version v.101: 1.07 = 7 percent distance to totally clean (totally clean is not possible, would take infinite time ) | |
1096 // changes in v.101: 1.05 = 5 percent dist to totally clean is new desaturation point for display and noFly calculations | |
1097 | |
1098 // N2 | |
1099 temp1 = 1.05f * temp_atem; | |
1100 temp1 = temp1 - (float)Tissue_nitrogen_bar[ci]; | |
1101 temp2 = temp_atem - (float)Tissue_nitrogen_bar[ci]; | |
1102 if (temp2 >= 0) | |
1103 { | |
1104 temp1 = 0; | |
1105 temp2 = 0; | |
1106 } | |
1107 else | |
1108 temp1 = temp1 / temp2; | |
1109 | |
1110 if (temp1 > 0) | |
1111 { | |
1112 temp1 = logf(1.0f - temp1); | |
1113 temp1 = temp1 / -0.6931f; // temp1 is the multiples of half times necessary. | |
1114 // 0.6931 is ln(2), because the math function log() calculates with a base of e not 2 as requested. | |
1115 // minus because log is negative | |
1116 temp2 = buehlmann_N2_t_halflife[ci] * temp1 / float_desaturation_multiplier; // time necessary (in minutes ) for complete desaturation (see comment about 10 percent) , new in v.101: float_desaturation_multiplier | |
1117 } | |
1118 else | |
1119 { | |
1120 temp1 = 0; | |
1121 temp2 = 0; | |
1122 } | |
1123 | |
1124 // He | |
1125 temp3 = 0.1f - (float)Tissue_helium_bar[ci]; | |
1126 if (temp3 >= 0) | |
1127 { | |
1128 temp3 = 0; | |
1129 temp4 = 0; | |
1130 } | |
1131 else | |
1132 temp3 = -1.0f * temp3 / (float)Tissue_helium_bar[ci]; | |
1133 if (temp3 > 0) | |
1134 { | |
1135 temp3 = logf(1.0f - temp3); | |
1136 temp3 = temp3 / -0.6931f; // temp1 is the multiples of half times necessary. | |
1137 // 0.6931 is ln(2), because the math function log() calculates with a base of e not 2 as requested. | |
1138 // minus because log is negative | |
1139 temp4 = buehlmann_He_t_halflife[ci] * temp3 / float_desaturation_multiplier; // time necessary (in minutes ) for "complete" desaturation, new in v.101 float_desaturation_multiplier | |
1140 } | |
1141 else | |
1142 { | |
1143 temp3 = 0; | |
1144 temp4 = 0; | |
1145 } | |
1146 | |
1147 // saturation_time (for flight) | |
1148 if (temp4 > temp2) | |
1149 int_temp = (int)temp4; | |
1150 else | |
1151 int_temp = (int)temp2; | |
1152 if(int_temp > int_O_desaturation_time) | |
1153 int_O_desaturation_time = int_temp; | |
1154 | |
1155 /*// N2 saturation in multiples of halftime for display purposes | |
1156 temp2 = temp1 * 20.0; // 0 = 1/8, 120 = 0, 249 = 8 | |
1157 temp2 = temp2 + 80.0; // set center | |
1158 if (temp2 < 0.0) | |
1159 temp2 = 0.0; | |
1160 if (temp2 > 255.0) | |
1161 temp2 = 255.0; | |
1162 U8_tissue_N2_saturation[ci] = (U8)temp2; | |
1163 // He saturation in multiples of halftime for display purposes | |
1164 temp4 = temp3 * 20.0; // 0 = 1/8, 120 = 0, 249 = 8 | |
1165 temp4 = temp4 + 80.0; // set center | |
1166 if (temp4 < 0.0) | |
1167 temp4 = 0.0; | |
1168 if (temp4 > 255.0) | |
1169 temp4 = 255.0; | |
1170 U8_tissue_He_saturation[ci] = (char)temp4;*/ | |
1171 } | |
1172 | |
1173 return int_O_desaturation_time; | |
1174 } |