CN114297583A - Real-time diving decompression method - Google Patents
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Abstract
The real-time diving decompression method comprises the following steps: determining a theoretical tissue sequence and a nitrogen tension sequence; taking 20m/10min as a first diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension after the diving of the first diving stage is finished; taking 40m/32min as a second diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension at the end of diving in the second diving stage; taking 31m/24min as a third diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension at the end of diving in the third diving stage to obtain a list np 3; calculating the equivalent underwater work time of the depth from the bottom based on np 3; calculating an actual first station depth, an actual time to reach the first station, and an actual theoretical tissue nitrogen tension list for reaching the first station in the reduced pressure protocol based on the depth from the bottom, the equivalent underwater work time, np 3; and calculating the residence time of each residence station based on the depth from the bottom, the equivalent underwater working time and the depth of the residence station.
Description
Technical Field
The invention relates to the technical field of diving decompression, in particular to a real-time diving decompression method.
Background
The existing diving decompression algorithm is planned diving, a nitrogen oversaturation safety coefficient table can be searched for the corresponding nitrogen oversaturation safety coefficient for the diving process at a specific depth and specific time, thereby generating a corresponding decompression scheme, while the existing real-time diving decompression algorithm is only a simple application of the planned diving decompression algorithm, accumulating the underwater working time of each subsection diving, taking the maximum depth as the diving depth, calculating a decompression scheme according to the diving depth and the time, for example, real-time diving at 20m/10min and 40m/32min, converted to 40m/42min, in addition, the existing safety coefficient table is a first gear with the depth of 3m, the time is divided into a plurality of gears of 5min, 10min, 15min, 20min, 25min, 60min and 120min, the gear is required to be upwards taken for the depth and the time which are not on the gear, therefore, the nitrogen supersaturation safety factor is finally searched for according to 42m/45min and the decompression scheme is calculated.
The underwater working time of each subsection diving is accumulated, the maximum depth is taken as the diving depth, the method is over conservative in decompression, and the total decompression time adopting the method can be greatly prolonged, so that the meaningless physical loss of a diver is increased, and the risk and diving cost of accidents in the diving process are improved.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides a novel real-time diving decompression method.
The invention solves the technical problems through the following technical scheme:
the invention provides a real-time diving decompression method, which comprises the following steps:
s1, determining a theoretical tissue sequence and a nitrogen tension sequence: the theoretical tissue sequences are divided according to the time required by nitrogen to complete 50% saturation degree in each tissue of a human body, the theoretical tissue sequences are respectively 5min, 10min, 20min, 30min and 40min … … 360min, and are 37 in total, the half-saturation time of the ith theoretical tissue is marked as issue [ i ], the nitrogen tension sequence is formed by the nitrogen tension dissolved by each theoretical tissue, the initial nitrogen tension np0[ i ] of each theoretical tissue is 0.8ATA (standard atmospheric pressure), and is 37 in total, the nitrogen tension of the ith theoretical tissue is marked as np [ i ], i is more than or equal to 1 and less than or equal to 37;
s2, taking a 20m/10min stage as a first diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension np1[ i ] at the end of diving in the first diving stage so as to obtain a nitrogen tension list np1 of the theoretical tissue at the end of diving in the first diving stage, wherein 20m represents the first diving depth, and 10min represents the first underwater working time;
taking a 40m/32min stage as a second diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension np2[ i ] at the end of diving in the second diving stage, so as to obtain a nitrogen tension list np2 of the theoretical tissue at the end of diving in the second diving stage, wherein 40m represents the second diving depth, and 32min represents the second underwater working time;
taking a 31m/24min stage as a third diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension np3[ i ] at the end of diving in the third diving stage so as to obtain a nitrogen tension list np3 of the theoretical tissue at the end of diving in the third diving stage, wherein 31m represents the third diving depth, and 24min represents the third underwater working time;
s3, calculating the equivalent underwater working time of the off-bottom depth based on a nitrogen tension list np3 of a theoretical organization at the end of the third diving stage, wherein the off-bottom depth is the third diving depth;
s4, calculating the actual depth of the first stop station, the actual time required for reaching the first stop station and the actual nitrogen tension list np5 of theoretical tissues in the decompression scheme based on the depth from the bottom and the corresponding equivalent underwater working time and the nitrogen tension list np3 of the theoretical tissues;
and S5, calculating the residence time of each residence station in the decompression scheme based on the depth of the bottom, the equivalent underwater working time and the depth of the residence station.
The positive progress effects of the invention are as follows:
the method takes the depth of the off-bottom as the diving depth, uniformly converts the underwater working time of each subsection diving into equivalent underwater working time corresponding to the off-bottom depth, and fits the existing safety coefficient through a neural network for the depth and time which are not on the gear of a nitrogen supersaturation safety coefficient table after conversion, so that the corresponding safety coefficient can be output at any depth and time, a real-time decompression scheme is generated, and the total decompression time is greatly shortened on the premise of ensuring safety.
Drawings
Fig. 1 is a flow chart of a real-time diving decompression method according to a preferred embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the present embodiment provides a real-time diving decompression method, which includes the following steps:
calculating absolute pressure (first diving depth 20m +10m)/10m/ATA (ATA) 3 ATA;
calculating the maximum nitrogen tension of the ith theoretical current depth deprivation or perfusion, namely the ith theoretical tissue initial nitrogen tension np0[ i ] -absolute pressure 0.8, namely the ith theoretical tissue initial nitrogen tension np0[ i ] -3 x 0.8, and 37 items in total;
calculating the ith assumed time unit as the first underwater working time 10min/issue [ i ], wherein the total number of the items is 37;
calculate the percentage of item i that is actually currently depthwise or perfused-1-0.5Item i assumes time unitThere are 37 in total;
calculating the actual current depth deprivation or perfusion nitrogen tension of the ith term (the percentage of the ith term in fact in current depth deprivation or perfusion) and the theoretical maximum nitrogen tension of the ith term in current depth deprivation or perfusion, wherein the total number of the terms is 37;
the accumulated ith nitrogen tension np1[ i ] ═ np0[ i ] -ith nitrogen tension of the ith actually present depth deprivation or perfusion at the end of the dive in the first dive stage is calculated, and 37 items are total, and 37 items are the ith nitrogen tension np1[ i ] form a nitrogen tension list np1 of theoretical tissues at the end of the dive in the first dive stage.
Taking a 40m/32min stage as a second diving stage, calculating the accumulated ith theoretical tissue nitrogen tension np2[ i ] at the end of the diving of the second diving stage, thereby obtaining a nitrogen tension list np2 of the theoretical tissue at the end of the diving of the second diving stage, wherein 40m represents the second diving depth, and 32min represents the second underwater working time:
calculating absolute pressure (second diving depth 40m +10m)/10m/ATA (ATA) 5 ATA;
calculating the maximum nitrogen tension of the ith term which is theoretically removed or infused at the current depth, namely the ith nitrogen tension np1[ i ] -absolute pressure 0.8 accumulated at the end of the diving in the first diving stage, namely the ith nitrogen tension np1[ i ] -5 0.8 accumulated at the end of the diving in the first diving stage, and totally 37 terms;
calculating the ith assumed time unit as the second underwater working time 32min/issue [ i ], wherein the total number of the items is 37;
calculate the percentage of item i that is actually currently depthwise or perfused-1-0.5Item i assumes time unitThere are 37 in total;
calculating the actual current depth deprivation or perfusion nitrogen tension of the ith term (the percentage of the ith term in fact in current depth deprivation or perfusion) and the theoretical maximum nitrogen tension of the ith term in current depth deprivation or perfusion, wherein the total number of the terms is 37;
the accumulated ith nitrogen tension np2[ i ] ═ np1[ i ] -ith nitrogen tension at the end of the second diving phase diving is calculated, and the actual current depth deprivation or perfusion nitrogen tension is calculated, so that the total number of 37 items is obtained, and the 37 items i and i nitrogen tensions np2[ i ] form a nitrogen tension list np2 of theoretical tissues at the end of the second diving phase diving.
Taking a 31m/24min stage as a third diving stage, calculating the accumulated ith theoretical tissue nitrogen tension np3[ i ] at the end of the diving of the third diving stage, thereby obtaining a nitrogen tension list np3 of the theoretical tissue at the end of the diving of the third diving stage, wherein 31m represents the third diving depth, and 24min represents the third underwater working time:
calculating absolute pressure (third diving depth 31m +10m)/10m/ATA (ATA) 4.1 ATA;
calculating the maximum nitrogen tension of the ith theoretical depth of the current deprivation or perfusion, namely the accumulated ith nitrogen tension np2[ i ] -absolute pressure 0.8at the end of the second diving stage diving, namely the accumulated ith nitrogen tension np2[ i ] -4.1 0.8at the end of the second diving stage diving, and totally 37;
calculating the ith assumed time unit as the third underwater working time 24min/issue [ i ], wherein the total number of the items is 37;
calculate the percentage of item i that is actually currently depthwise or perfused-1-0.5Item i assumes time unitThere are 37 in total;
calculating the actual current depth deprivation or perfusion nitrogen tension of the ith term (the percentage of the ith term in fact in current depth deprivation or perfusion) and the theoretical maximum nitrogen tension of the ith term in current depth deprivation or perfusion, wherein the total number of the terms is 37;
the accumulated ith nitrogen tension np3[ i ] ═ np2[ i ] -ith nitrogen tension at the end of the third diving phase diving is calculated, and the cumulative ith nitrogen tension np3[ i ] is actually the nitrogen tension of the current depth deprivation or perfusion, and the total number of 37 items is 37, and the 37 ith nitrogen tension np3[ i ] forms a nitrogen tension list np3 of theoretical tissues at the end of the third diving phase diving.
calculate s [ i ] ═ (np3[ i ] -0.8)/(bottoming depth 31/10 × 0.8) for a total of 37;
calculate the hypothetical time Unit [ i ]]＝log0.5(1-s[i]) And converted into equivalent underwater working time t [ i ]]Assuming a unit of time [ i ═ i]*issue[i]There are 37 in total;
after comparison and verification, the equivalent underwater working time t [37] obtained through conversion is the assumed time unit [37 ]. issue [37 ]. the assumed time unit [37 ]. 360 is taken as the equivalent underwater working time of the off-bottom depth.
inputting total 762 training samples which are input as diving depth and equivalent underwater working time and output as an off-bottom safety coefficient into a first BP neural network for network training to obtain a trained off-bottom safety coefficient neural network, wherein the off-bottom safety coefficient is used for determining the depth of a first stop station and is determined by two variables of the diving depth and the equivalent underwater working time;
inputting the off-bottom depth (31m) and the corresponding equivalent underwater working time (the equivalent underwater working time calculated in the step 103) into the trained off-bottom safety coefficient neural network to obtain an off-bottom safety coefficient;
calculating an experimental first dwell station depth [ (advanced tissue nitrogen tension/off-bottom safety factor) -1] × 10, where advanced tissue nitrogen tension refers to the maximum value in the theoretical tissue nitrogen tension list np3, and the calculated experimental first dwell station depth rounded up by a factor of 3, and if the result is 9.9m, 12 m;
calculating the time required for the test to reach the first stop station, namely (the depth from the bottom is 31 m-the depth of the test first stop station is 12 m)/a preset rising speed, and rounding up the calculated time required for the test to reach the first stop station by dividing the time required for the test to reach the first stop station into units, wherein if the calculated time required for the test to reach the first stop station is 5.4 minutes, rounding up the time required for the test to reach the first stop station is 6 minutes;
calculating the maximum nitrogen tension of the experimental theoretical deprivation or perfusion, i.e., the theoretical tissue nitrogen tension np3[ i ] - [ (absolute pressure at water bottom + absolute pressure at first station)/2 ] × 0.8, i.e., the theoretical tissue nitrogen tension np3[ i ] - [ ((31+10)/10+ (12+10)/10)/2] × 0.8, for a total of 37;
calculating a tentative assumed time unit [ i ] -the tentative time/issue [ i ] required to reach the first stop, for a total of 37;
calculating the percent of shedding or perfusion [ i ] corresponding to the tentative hypothetical time unit]＝1-0.5Tentative assumed time Unit [ i ]]There are 37 in total;
calculating the tentative actual current depth deprivation or perfusion nitrogen tension [ i ] -the tentative assumed time unit corresponding percentage of deprivation or perfusion [ i ] -the tentative theoretical maximum deprivation or perfusion nitrogen tension, for a total of 37;
calculating the tentative accumulated nitrogen tension [ i ] ═ ith theoretical tissue nitrogen tension np3[ i ] -tentative actual current deep deprived or perfused nitrogen tension [ i ], constituting a tentative accumulated nitrogen tension list np4 with a total of 37 entries;
after modifying the leading tissue nitrogen tension to the maximum value in the accumulated nitrogen tension list np4, repeating the steps: calculating the actual first stop station depth as [ (maximum value/off-bottom safety factor in the accumulated nitrogen tension list np 4) -1] × 10, and rounding up the calculated actual first stop station depth by a multiple of 3, and if the result is 10m, taking 12 m;
calculating the time required for actually reaching the first stop station, namely (the depth from the bottom-the actual depth of the first stop station)/a preset rising speed, and rounding up the calculated time required for actually reaching the first stop station by dividing the time required for actually reaching the first stop station into units, wherein if the calculated time required for experimentally reaching the first stop station is 6.6 minutes, rounding up is carried out by taking 7 minutes as the time required for experimentally reaching the first stop station;
calculating the maximum nitrogen tension for actual theoretical deprivation or perfusion, i.e., the theoretical tissue nitrogen tension np4[ i ] - [ (absolute pressure at water bottom + absolute pressure at first station)/2 ] × 0.8, i.e., the theoretical tissue nitrogen tension np3[ i ] - [ ((31+10)/10+ (12+10)/10)/2] × 0.8, for a total of 37;
calculating an actual assumed time unit [ i ] -the time/issue [ i ] required to reach the first stop, for a total of 37;
calculating the percentage of dropout or perfusion [ i ] corresponding to the actual assumed time unit]＝1-0.5Assuming time units[i]There are 37 in total;
calculating the actual current depth deprived or perfused nitrogen tension [ i ] -the percentage of deprived or perfused corresponding to the actual assumed time unit-the actual theoretical maximum nitrogen tension deprived or perfused, for a total of 37 terms;
the cumulative nitrogen tension [ i ] -the ith theoretical tissue nitrogen tension np3[ i ] -the actual current depth deprivation or perfusion nitrogen tension [ i ] is calculated to form the actual arrival at the first docking station theoretical tissue nitrogen tension list np5 for a total of 37 entries.
105, calculating the residence time of each residence station in the decompression scheme based on the off-bottom depth, the equivalent underwater working time and the residence station depth:
setting the number of the stopping stations with j being more than or equal to 1 and less than or equal to j, calculating the depth of the j +1 th stopping station to be the depth-3 m of the j th stopping station, and determining the depth of each stopping station after the depth of the first stopping station is determined because the depth of the first stopping station is rounded up to 3, wherein the depth of each stopping station is determined accordingly, for example, the depth of the 2 nd stopping station to be the depth-3 m of the 1 st stopping station to be 12m-3m to be 9 m;
inputting a total of 2765 training samples which are input as diving depth, equivalent underwater working time and station depth and output as station safety factors into a second BP neural network for network training to obtain a trained station safety factor neural network, wherein the station safety factors are used for determining the stopping time of each station and are determined by three variables of diving depth, equivalent underwater working time and station depth;
inputting the depth of the off-bottom, the equivalent underwater working time and the depth of the stop station into a stop station safety coefficient neural network to obtain a stop station safety coefficient;
calculating the safe supersaturated nitrogen tension of the j +1 th stop station (j +1 th stop station absolute pressure x j th stop station safety coefficient);
the nitrogen tension that must be desaturated before rising to the j +1 th stop is calculated: when j is 1, the nitrogen tension which must be desaturated before rising to the j +1 st staying station is the theoretical tissue nitrogen tension np5[ i ] -the j +1 st staying station which actually reaches the 1 st staying station, and the total number of the nitrogen tensions is 37; when j is more than or equal to 2, the nitrogen tension which must be desaturated before rising to the j +1 th stop station is equal to the nitrogen tension np [ i ] -the j +1 th stop station after stopping, and the total number of the tension is 37;
determining the nitrogen tension of the tissue advanced by the jth stop: calculating the nitrogen tension [ i ]. issue [ i ] which must be desaturated before rising to the j +1 th stop station, selecting i corresponding to the maximum value, when j is 1, the theoretical tissue nitrogen tension np5[ i ] corresponding to the selected i and actually reaching the 1 st stop station is the nitrogen tension of the leading tissue of the j th stop station, and when j is more than or equal to 2, the nitrogen tension np [ i ] after stopping of the j-1 th stop station corresponding to the selected i is the nitrogen tension of the leading tissue of the j th stop station, and only 1 item exists;
calculating the maximum possible desaturated nitrogen tension of the leading tissue at the jth stop station, namely the nitrogen tension of the leading tissue at the jth stop station-absolute pressure of the jth stop station multiplied by 0.8, and only 1 item is included;
calculating the desaturation percentage of the leading tissue, namely the desaturation nitrogen tension which is necessary before the leading tissue rises to the j +1 th stop station, and the maximum desaturation nitrogen tension of the leading tissue in the j th stop station multiplied by 100 percent, namely the selected i corresponding to the nitrogen tension which is necessary to desaturate before the leading tissue rises to the j +1 th stop station, and the maximum desaturation nitrogen tension [ i ]/the leading tissue which is necessary to desaturate in the j th stop station multiplied by 100 percent, and only 1 term is needed;
calculating the stopping time of the j stopping station as the corresponding issue [ i ] of the selected i]*log0.5(1-percentage of desaturation necessary for the advanced tissue), only 1 term.
When j is 1:
calculating the nitrogen tension after the 1 st stop station stops according to the 1 st stop station stop time and the theoretical tissue nitrogen tension list actually reaching the 1 st stop station:
calculating the maximum nitrogen tension of the ith station at the theoretical current depth of deprivation or perfusion, namely the theoretical tissue nitrogen tension np [ i ] -0.8 of the 1 st station at the actual arrival of the ith station, and totally 37 items;
calculating the ith assumed time unit of the 1 st stop station as the 1 st stop station stop time/issue [ i ], wherein the total number of the items is 37;
calculate the percentage of the 1 st docking station item that is actually currently depthwise or perfused 1-0.5Item i of the 1 st stop presuming time unitThere are 37 in total;
calculating the actual current depth deprivation or perfusion nitrogen tension of item i of the 1 st docking station as a percentage of the actual current depth deprivation or perfusion of item i of the 1 st docking station and the theoretical current depth deprivation or perfusion maximum nitrogen tension of item i of the 1 st docking station, wherein the total number of items is 37;
and calculating the ith nitrogen tension np [ i ] after the 1 st stopping station stops, namely the theoretical tissue nitrogen tension np [ i ] actually reaching the 1 st stopping station and the ith nitrogen tension actually in the current depth deprivation or perfusion at the 1 st stopping station, thereby obtaining a nitrogen tension list np after the 1 st stopping station stops, wherein the total number of the items is 37.
When j is more than or equal to 2:
and (3) calculating the nitrogen tension after the stopping of the jth stopping station according to the stopping time of the jth stopping station and the nitrogen tension list after the stopping of the jth-1 stopping station:
calculating the maximum nitrogen tension of the ith station which is theoretically removed or filled at the current depth, namely the nitrogen tension np [ i ] -0.8 of the jth station after the stop of the jth-1 station, and totally 37 items;
calculating the ith assumed time unit of the jth station as the jth station staying time/issue [ i ], wherein the total number of the ith assumed time unit is 37;
calculating the percentage of the ith of the jth docking station that is actually currently depthwise or perfused 1-0.5Item i of the jth stop assuming a time unitThere are 37 in total;
calculating the actual current depth deprivation or perfusion nitrogen tension of the ith station (i is the actual current depth deprivation or perfusion percentage of the ith station (i is the theoretical current depth deprivation or perfusion maximum nitrogen tension of the ith station (i) and 37 in total);
and (3) calculating the ith nitrogen tension np [ i ] (the j-th nitrogen tension np [ i ] - [ 1] th nitrogen tension after the stopping of the stopping station at the jth stopping station at the actually current depth of the nitrogen tension for removing or filling, thereby obtaining a nitrogen tension list np after the stopping of the jth stopping station at the jth station at the last.
And (3) repeatedly calculating the depth of each stop station until water flows out (the depth of the stop station is 0), so that the decompression time of each stop station can be obtained, and a complete real-time diving decompression scheme can be obtained by combining the actual time for reaching the first stop station.
The method realizes the calculation of the diving decompression scheme corresponding to the real-time diving scheme with different diving depths and different underwater working times in multiple stages, greatly reduces the total decompression time required by the decompression process on the premise of ensuring the safety compared with the traditional method for realizing the decompression calculation by simple accumulation, and verifies the safety through 12 groups of goat animal experiments.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (8)
1. A real-time submersible pressure reduction method, comprising the steps of:
s1, determining a theoretical tissue sequence and a nitrogen tension sequence: the theoretical tissue sequences are divided according to the time required by nitrogen to complete 50% saturation degree in each tissue of a human body, the theoretical tissue sequences are respectively 5min, 10min, 20min, 30min and 40min … … 360min, and are 37 in total, the half-saturation time of the ith theoretical tissue is marked as issue [ i ], the nitrogen tension sequence is formed by the nitrogen tension dissolved by each theoretical tissue, the initial nitrogen tension np0[ i ] of each theoretical tissue is 0.8ATA, and is 37 in total, the nitrogen tension of the ith theoretical tissue is marked as np [ i ], and i is more than or equal to 1 and less than or equal to 37;
s2, taking a 20m/10min stage as a first diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension np1[ i ] at the end of diving in the first diving stage so as to obtain a nitrogen tension list np1 of the theoretical tissue at the end of diving in the first diving stage, wherein 20m represents the first diving depth, and 10min represents the first underwater working time;
taking a 40m/32min stage as a second diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension np2[ i ] at the end of diving in the second diving stage, so as to obtain a nitrogen tension list np2 of the theoretical tissue at the end of diving in the second diving stage, wherein 40m represents the second diving depth, and 32min represents the second underwater working time;
taking a 31m/24min stage as a third diving stage, and calculating the accumulated ith theoretical tissue nitrogen tension np3[ i ] at the end of diving in the third diving stage so as to obtain a nitrogen tension list np3 of the theoretical tissue at the end of diving in the third diving stage, wherein 31m represents the third diving depth, and 24min represents the third underwater working time;
s3, calculating the equivalent underwater working time of the off-bottom depth based on a nitrogen tension list np3 of a theoretical organization at the end of the third diving stage, wherein the off-bottom depth is the third diving depth;
s4, calculating the actual depth of the first stop station, the actual time required for reaching the first stop station and the actual nitrogen tension list np5 of theoretical tissues in the decompression scheme based on the depth from the bottom and the corresponding equivalent underwater working time and the nitrogen tension list np3 of the theoretical tissues;
and S5, calculating the residence time of each residence station in the decompression scheme based on the depth of the bottom, the equivalent underwater working time and the depth of the residence station.
2. The real-time submersible pressure reduction method of claim 1, wherein in step S2, the 20m/10min first diving phase:
calculating absolute pressure (first diving depth 20m +10m)/10m/ATA (ATA) 3 ATA;
calculating the maximum nitrogen tension of the ith theoretical current depth deprivation or perfusion, namely the ith theoretical tissue initial nitrogen tension np0[ i ] -absolute pressure 0.8;
calculating the unit of the ith assumed time as the first underwater working time 10min/issue [ i ];
calculating the percentage of the ith term that is actually currently depthwise or perfused 1-0.5 the ith assumed time unit;
calculating the actual current depth deprivation or perfusion nitrogen tension of the ith term (the percentage of the ith term in fact in current depth deprivation or perfusion) and the theoretical maximum nitrogen tension of the ith term in current depth deprivation or perfusion;
calculating the accumulated nitrogen tension np1[ i ] ═ np0[ i ] -the ith nitrogen tension actually at the current depth of the absence or perfusion at the end of the first diving stage;
40m/32min second diving phase:
calculating absolute pressure (second diving depth 40m +10m)/10m/ATA (ATA) 5 ATA;
calculating the maximum nitrogen tension of the ith term which is theoretically the accumulated nitrogen tension np1[ i ] -absolute pressure 0.8 after the end of the diving in the first diving stage when the current depth is removed or perfused;
calculating the unit of the ith assumed time as the second underwater working time 32min/issue [ i ];
calculate the percentage of item i that is actually currently depthwise or perfused-1-0.5Item i assumes time unit；
Calculating the actual current depth deprivation or perfusion nitrogen tension of the ith term (the percentage of the ith term in fact in current depth deprivation or perfusion) and the theoretical maximum nitrogen tension of the ith term in current depth deprivation or perfusion;
calculating the accumulated nitrogen tension np2[ i ] ═ np1[ i ] -the ith nitrogen tension actually removed or perfused at the current depth of the second diving stage at the end of diving;
31m/24min third diving phase:
calculating absolute pressure (third diving depth 31m +10m)/10m/ATA (ATA) 4.1 ATA;
calculating the maximum nitrogen tension of the ith term which is theoretically the accumulated nitrogen tension np2[ i ] -absolute pressure 0.8 after the end of the diving in the second diving stage when the current depth is removed or perfused;
calculating the ith assumed time unit as the third underwater working time 24min/issue [ i ];
calculating the percentage of the ith term that is actually currently depthwise or perfused 1-0.5 the ith assumed time unit;
calculating the actual current depth deprivation or perfusion nitrogen tension of the ith term (the percentage of the ith term in fact in current depth deprivation or perfusion) and the theoretical maximum nitrogen tension of the ith term in current depth deprivation or perfusion;
the accumulated ith nitrogen tension np3[ i ] ═ np2[ i ] -ith nitrogen tension for the actual current depth deprivation or perfusion at the end of the third diving phase is calculated.
3. The real-time submersible pressure reduction method as claimed in claim 1, wherein the step S3 comprises the steps of: calculating s [ i ] ═ (np3[ i ] -0.8)/(bottoming depth 31/10 × 0.8);
calculate the hypothetical time Unit [ i ]]＝log0.5(1-s[i]) And converted into equivalent underwater working time t [ i ]]Assuming a unit of time [ i ═ i]*issue[i]；
After comparison and verification, the equivalent underwater working time t [37] obtained through conversion is the assumed time unit [37 ]. issue [37 ]. the assumed time unit [37 ]. 360 is taken as the equivalent underwater working time of the off-bottom depth.
4. The real-time submersible pressure reduction method as claimed in claim 1, wherein the step S4 comprises the steps of: inputting the depth of the off-bottom and the corresponding equivalent underwater working time into a trained off-bottom safety coefficient neural network to obtain an off-bottom safety coefficient;
calculating an experimental first dwell station depth ═ [ (leading tissue nitrogen tension/off-bottom safety factor) -1] × 10, where leading tissue nitrogen tension refers to the maximum value in the theoretical tissue nitrogen tension list np3, the calculated experimental first dwell station depth rounded up by a factor of 3;
calculating the time required for the trial to reach the first stop station, namely (off-bottom depth-trial first stop station depth)/a preset rising speed, and rounding up the calculated time required for the trial to reach the first stop station by dividing the time into units;
calculating the maximum nitrogen tension of the experimental theoretical deprivation or perfusion, i.e. the i th theoretical tissue nitrogen tension np3[ i ] - [ (absolute pressure at water bottom + absolute pressure at first station)/2 ] × 0.8;
calculating a tentative assumed time unit [ i ] -the tentative time/issue [ i ] required to reach the first stop;
calculating the percent of shedding or perfusion [ i ] corresponding to the tentative hypothetical time unit]＝1-0.5Tentative assumed time unit[i]；
Calculating the tentative actual current depth deprivation or perfusion nitrogen tension [ i ] -the tentative assumed time unit corresponding percentage of deprivation or perfusion [ i ] -the tentative theoretical maximum nitrogen tension of deprivation or perfusion;
calculating the tentative accumulated nitrogen tension [ i ] ═ ith theoretical tissue nitrogen tension np3[ i ] — the tentative actually current deep deprived or perfused nitrogen tension [ i ], constituting a tentative accumulated nitrogen tension list np 4;
calculating the actual first stop station depth as [ (maximum value/off-bottom safety factor in the accumulated nitrogen tension list np 4) -1] × 10, and rounding up the calculated actual first stop station depth by a multiple of 3;
calculating the time required for actually reaching the first stop station (the depth from the bottom-the depth of the actual first stop station)/a preset rising speed, and rounding up the calculated time required for actually reaching the first stop station by dividing into units;
calculating the maximum nitrogen tension of the ith theoretical tissue np4[ i ] - [ (absolute pressure at water bottom + absolute pressure at first station)/2 ] × 0.8;
calculating an actual assumed time unit [ i ] -the time/issue [ i ] required to reach the first stop;
calculating the percentage of dropout or perfusion [ i ] corresponding to the actual assumed time unit]＝1-0.5Assuming time units[i]；
Calculating the actual current depth deprived or perfused nitrogen tension [ i ] -the percentage of deprived or perfused corresponding to the actual assumed time unit-the actual theoretical maximum nitrogen tension of deprived or perfused;
and calculating the accumulated nitrogen tension [ i ] - [ i ] th theoretical tissue nitrogen tension np3[ i ] - [ i ] actually removing or perfusing the tissue at the current depth to form a theoretical tissue nitrogen tension list np5 actually reaching the first staying station.
5. The real-time diving decompression method according to claim 1, wherein training samples with input of diving depth and equivalent underwater working time and output of off-bottom safety factor are input into the first BP neural network for network training to obtain a trained off-bottom safety factor neural network.
6. The real-time submersible pressure reduction method of claim 1, wherein training samples with input of submersible depth, equivalent underwater working time and docking station depth and output of docking station safety factor are input into the second BP neural network for network training to obtain a trained docking station safety factor neural network.
7. The real-time submersible pressure reduction method as claimed in claim 1, wherein the step S5 comprises the steps of:
setting the number of the stopping stations with j being more than or equal to 1 and less than or equal to j, and calculating the depth of the j +1 th stopping station to be the depth of the j th stopping station-3 m;
inputting the depth of the off-bottom, the equivalent underwater working time and the depth of the stop station into a stop station safety coefficient neural network to obtain a stop station safety coefficient;
calculating the safe supersaturated nitrogen tension of the j +1 th stop station (j +1 th stop station absolute pressure x j th stop station safety coefficient);
calculating the nitrogen tension which must be desaturated before rising to the j +1 th stop station, namely the theoretical tissue nitrogen tension actually reaching the j th stop station-the safe supersaturated nitrogen tension of the j +1 th stop station;
determining the nitrogen tension of the tissue advanced by the jth stop: calculating the nitrogen tension [ i ] x issue [ i ] which must be desaturated before rising to the j +1 th stop station, selecting i corresponding to the maximum value, wherein the theoretical tissue nitrogen tension np [ i ] corresponding to the selected i and actually reaching the j th stop station is the nitrogen tension of the leading tissue of the j th stop station;
calculating the maximum possible desaturated nitrogen tension of the leading tissue at the jth stop station, namely the nitrogen tension of the leading tissue at the jth stop station-absolute pressure of the jth stop station x 0.8;
calculating the percentage of desaturation necessary for the leading tissue, i.e. the maximum desaturation tension necessary for the leading tissue to ascend to the j +1 th dwell station x 100%,/the maximum desaturation tension possible for the leading tissue to ascend to the j +1 th dwell station x 100% respectively;
calculating the stopping time of the j stopping station as the corresponding issue [ i ] of the selected i]*log0.5(1-percentage of desaturation necessary for the leading tissue).
8. The real-time submersible pressure reduction method of claim 7, wherein step S5 further comprises the steps of:
when j is 1:
calculating the nitrogen tension after the 1 st stop station stops according to the 1 st stop station stop time and the theoretical tissue nitrogen tension list actually reaching the 1 st stop station:
calculating the maximum nitrogen tension of the ith station at the theoretical current depth of deprivation or perfusion, which actually reaches the theoretical tissue nitrogen tension np [ i ] -0.8 of the 1 st station;
calculating the 1 st station stay item ith assumed time unit as the 1 st station stay time/issue [ i ];
calculate the percentage of the 1 st docking station item that is actually currently depthwise or perfused 1-0.51 st The ith assumed time unit of each station；
Calculating the actual current depth deprivation or perfusion nitrogen tension of item i of the 1 st docking station as a percentage of the actual current depth deprivation or perfusion of item i of the 1 st docking station and the theoretical current depth deprivation or perfusion maximum nitrogen tension of item i of the 1 st docking station;
calculating the ith nitrogen tension np [ i ] (the actual theoretical tissue nitrogen tension np [ i ] of the 1 st stop station to the ith nitrogen tension for actually deeply removing or filling the item of the 1 st stop station), so as to obtain a nitrogen tension list np after the 1 st stop station stops;
when j is more than or equal to 2:
and (3) calculating the nitrogen tension after the stopping of the jth stopping station according to the stopping time of the jth stopping station and the nitrogen tension list after the stopping of the jth-1 stopping station:
calculating the maximum nitrogen tension of the ith station which is theoretically removed or filled at the current depth, namely the nitrogen tension np [ i ] -0.8 of the jth station after the jth-1 station stops;
calculating the ith assumed time unit of the jth stop station as the jth stop station stop time/issue [ i ];
calculating the percentage of the ith of the jth docking station that is actually currently depthwise or perfused 1-0.5Item i of the jth stop assuming a time unit；
Calculating the actual current depth deprivation or perfusion nitrogen tension of the ith station (i) the jth station (i) the percentage of the actual current depth deprivation or perfusion of the ith station (i) the theoretical current depth deprivation or perfusion maximum nitrogen tension of the ith station (i);
and calculating the ith nitrogen tension np [ i ] (the nitrogen tension np [ i ] after the j-th stop station stops till the j-1 th stop station stops till the ith item of the j-th stop station actually and deeply drops or fills the nitrogen tension so as to obtain a nitrogen tension list np after the j-th stop station stops.
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| US4054783A (en) * | 1976-03-09 | 1977-10-18 | Wisconsin Alumni Research Foundation | Decompression plan device |
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| CN102190077A (en) * | 2010-03-19 | 2011-09-21 | 中国人民解放军海军医学研究所 | Diving decompression method and system |
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| CN113002735A (en) * | 2021-03-12 | 2021-06-22 | 中国人民解放军海军特色医学中心 | Saturated diving decompression method and decompression system |
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| US4054783A (en) * | 1976-03-09 | 1977-10-18 | Wisconsin Alumni Research Foundation | Decompression plan device |
| JPH05280981A (en) * | 1992-04-03 | 1993-10-29 | Casio Comput Co Ltd | Reduced-pressure computation apparatus for diving use |
| CN102190077A (en) * | 2010-03-19 | 2011-09-21 | 中国人民解放军海军医学研究所 | Diving decompression method and system |
| CN113002736A (en) * | 2021-03-12 | 2021-06-22 | 中国人民解放军海军特色医学中心 | Sub-saturated diving decompression method and decompression system |
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