CN113928513A - Diving protection method and system based on diving computer - Google Patents
Diving protection method and system based on diving computer Download PDFInfo
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- 230000009189 diving Effects 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000006837 decompression Effects 0.000 claims abstract description 36
- 238000013178 mathematical model Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 18
- 230000001174 ascending effect Effects 0.000 claims abstract description 10
- 239000011261 inert gas Substances 0.000 claims description 63
- 238000004364 calculation method Methods 0.000 claims description 23
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 abstract description 7
- 230000036541 health Effects 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 206010011951 Decompression Sickness Diseases 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000000241 respiratory effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
- B63C11/02—Divers' equipment
- B63C11/32—Decompression arrangements; Exercise equipment
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Abstract
The invention provides a diving protection method and a system based on a diving computer, wherein the diving protection method based on the diving computer comprises the following steps: in the first decompression stage, calculating to obtain the lowest allowable environment absolute pressure of theoretical body tissues by adopting a mathematical model with gradient factors according to a diving plan; the diving plan includes: the depth of the diving destination, the time spent at the destination depth, the depth of each stop station and the theoretical minimum time spent at each stop station, the first decompression phase is the process of ascending to the last stop station at the diving destination; and outputting the continuously rising prompt message when the theoretical body tissue lowest allowable environment absolute pressure is less than or equal to the environment pressure of the next stop station and the stop time of the current stop station is greater than or equal to the minimum time theoretically required to stop at the current stop station. The invention can monitor the lowest allowable environment absolute pressure of corresponding theoretical body tissues according to the change of the diving position so as to ensure the physical health of diving personnel.
Description
Technical Field
The invention relates to the technical field of computer control, in particular to a diving protection method and system based on a diving computer.
Background
When the diver finishes diving operation and leaves a high-pressure environment to rise to the water surface, the diver needs to stay at different depths for necessary time to reduce pressure, so that supersaturation dissolved inert gas in the diver is discharged out of the body, otherwise, pressure reduction disease occurs slightly, and casualties are caused seriously. The diving decompression table is a decompression program table specially designed for divers, and decompression is carried out according to decompression parameters specified by the diving decompression table, so that the inert gas supersaturated and dissolved in the divers can be discharged out of the body at a high speed without causing decompression diseases, and the divers can safely return to normal pressure.
At present, in the diving operation process matched with a water worker, the water worker records the diving depth, the estimated diving operation duration, the actual diving operation duration and other information of the diving operation of the diver, selects a proper decompression parameter according to a contrast diving decompression table, and controls the decompression process of the diver in the whole process. The decompression parameters are mainly calculated according to a ZH-L16 mathematical model at present, and the ZH-L16 mathematical model divides a human body into 16 tissue cells, namely 16 types of theoretical tissues, and gives the tissue cells different half lives, and the half lives range from minutes to hours. The lowest allowable environmental pressure of all 16 types of theoretical tissues is calculated through a ZH-L16 mathematical model, the maximum numerical value of the lowest allowable environmental pressure in the 16 types of theoretical tissues is used as the theoretical tissue for limiting the current upper limit of reduced pressure, and the depth corresponding to the maximum numerical value of the lowest allowable environmental pressure is the current upper limit of reduced pressure.
Specifically, in the decompression process of the diver, the diver needs to quickly search from a diving decompression table and select a proper decompression parameter to guide the diver to decompress at a depth below the upper limit of decompression, so that the professional requirement on the diver is very strict. And because the staff on water need pay close attention to diver's diving operation process constantly, long-time concentration easily leads to the staff on water tired, leads to making wrong judgement to bring the potential safety hazard for the diver.
Disclosure of Invention
In order to solve the problems, the diving protection method and the diving protection system based on the diving computer provided by the invention monitor the lowest allowable environment absolute pressure of the corresponding theoretical body tissues through the mathematical model with the gradient factors, thereby ensuring the body health of diving personnel.
In a first aspect, the present invention provides a diving protection method based on a diving computer, comprising:
in a first decompression phase, a theoretical body tissue minimum allowable environment absolute pressure is calculated by using a mathematical model with a gradient factor according to a diving plan, wherein the diving plan comprises: the depth of the diving destination, the time spent at the destination depth, the depth of each stop station and the theoretical minimum time spent at each stop station, wherein the first decompression phase is the process of ascending to the last stop station at the diving destination;
outputting prompt information capable of continuously rising under the condition that the lowest allowable environment absolute pressure of the theoretical body tissue is less than or equal to the environment pressure of the next stop station and the stop time of the current stop station is greater than or equal to the minimum time theoretically required to stop at the current stop station;
the gradient factor is used for reducing the difference value between the current theoretical tissue inert gas tension and the lowest allowable environment pressure, and is determined by the depth of the diving destination, the gradient reference factor, the current depth and the time of staying at the current depth.
Optionally, the calculating a theoretical body tissue minimum allowable environment absolute pressure by using a mathematical model with a gradient factor includes:
and determining the lowest allowable environment absolute pressure of the theoretical body tissue according to the inert gas tension of the current theoretical tissue, the gradient factor and a preset empirical threshold.
Optionally, the method further comprises: determining the gradient factor according to a high empirical parameter, a low empirical parameter and a depth threshold;
the value range of the high experience parameter is [0, 1], and the value range of the low experience parameter is [0, 1 ].
Optionally, the determining the gradient factor according to the high-experience parameter, the low-experience parameter and the depth threshold includes:
subtracting the low empirical parameter from the high empirical parameter to obtain an empirical difference;
subtracting the anchor point of the low empirical parameter from the anchor point of the high empirical parameter to obtain an anchor point difference value;
subtracting the anchor point of the low empirical parameter from a depth threshold value to obtain a calibration difference value;
and dividing the experience difference value by the anchor point difference value, multiplying the anchor point difference value by the calibration difference value, and adding the anchor point difference value and the calibration difference value to obtain the gradient factor.
Optionally, the empirical threshold comprises: a first empirical threshold and a second empirical threshold;
the determining the lowest allowable environment absolute pressure of the theoretical body tissue according to the inert gas tension of the current theoretical tissue, the gradient factor and a preset empirical threshold comprises the following steps:
subtracting the product of the gradient factor and a first experience threshold value from the inert gas tension of the current theoretical tissue to obtain first data;
dividing the gradient factor by the second empirical threshold to obtain a quotient, adding the quotient to the gradient factor, and subtracting a unit value to obtain second data;
and dividing the first data by the second data to obtain the lowest allowable environment absolute pressure of the theoretical body tissue.
Optionally, the method further comprises:
acquiring theoretical tissue breathing inert gas pressure before diving and theoretical tissue breathing inert gas pressure at the current depth;
subtracting the value of one unite-tkObtaining third data, wherein e is a natural constant, t is a half-life period of the inert gas breathed by the tissue, and k is a half-saturation time constant of the inert gas breathed by the tissue;
subtracting the theoretical tissue breathing inert gas pressure before diving from the theoretical tissue breathing inert gas pressure at the current depth to obtain fourth data;
multiplying the third data and the fourth data to obtain fifth data;
and adding the pressure of the inert gas breathed by the theoretical tissue before diving to the fifth data to obtain the tension of the inert gas of the current theoretical tissue.
Optionally, the method further comprises:
in the second decompression stage, calculating by adopting a ZH-L16 mathematical model to obtain the lowest allowable environment absolute pressure of theoretical body tissues;
outputting prompt information to prompt that the theoretical body tissue can continuously rise under the condition that the lowest allowable environment absolute pressure is less than or equal to the environment pressure of the next stop station and the stop time of the current stop station is greater than or equal to the minimum time theoretically required to stop at the current stop station;
wherein the second decompression phase is a process of rising to the surface at the last stop.
In a second aspect, the present invention provides a diving protection system based on a diving computer, which is applied to a first decompression phase, and comprises:
a first calculation module configured to calculate a theoretical body tissue minimum allowable environment absolute pressure by using a mathematical model with a gradient factor according to the diving plan in a first decompression phase;
a first output module configured to output prompt information to prompt that the body tissue can continue to rise when the theoretical body tissue minimum allowable environment absolute pressure is less than or equal to the environment pressure of the next stop station and the current stop station stop time is greater than or equal to the minimum time theoretically required for stopping at the current stop station;
the gradient factor is used for reducing the difference value between the current theoretical tissue inert gas tension and the lowest allowable environment pressure, and is determined by the depth of the diving destination, the gradient reference factor, the current depth and the time of staying at the current depth.
Optionally, the first computing module includes:
a determination submodule configured to determine the theoretical body tissue minimum allowable ambient absolute pressure based on a current theoretical tissue inert gas tension, the gradient factor and a preset empirical threshold.
Optionally, the system further comprises a determination module configured to determine the gradient factor based on a high empirical parameter, a low empirical parameter, and a depth threshold;
the value range of the high experience parameter is [0, 1], and the value range of the low experience parameter is [0, 1 ];
the determining module comprises:
a first calculation submodule configured to subtract the high experience parameter from the low experience parameter to obtain an experience difference value;
a second calculation submodule configured to subtract the anchor point of the low empirical parameter from the anchor point of the high empirical parameter to obtain an anchor point difference value;
a third computing submodule configured to subtract the anchor point of the low empirical parameter from a depth threshold to obtain a calibration difference;
and the fourth calculation sub-module is configured to divide the experience difference value by the anchor point difference value, multiply the anchor point difference value by the calibration difference value, and add the anchor point difference value and the calibration difference value to the low experience parameter to obtain the gradient factor.
The diving protection method and system based on the diving computer provided by the embodiment of the invention are characterized in that the gradient factor is used for reducing the difference value between the inert gas tension of the current theoretical tissue and the lowest allowable environment pressure of the current theoretical tissue, and the gradient factor is determined by the depth of a diving destination, a gradient reference factor, the current depth and the time of staying at the current depth, so that the lowest allowable environment absolute pressure of the corresponding theoretical body tissue is dynamically adjusted and monitored through a mathematical model with the gradient factor, the lowest allowable environment absolute pressure of the theoretical body tissue is less than or equal to the environment pressure of the next staying station, and prompt information is output under the condition that the staying time of the current staying station is greater than or equal to the minimum time theoretically required to stay at the current staying station, so as to prompt that the body health of diving personnel can be ensured by continuous rising.
Drawings
Fig. 1 is a schematic flow chart of a diving protection method based on a diving computer according to an embodiment of the present application;
FIG. 2 shows GF according to an embodiment of the present applicationLowAnd GFHighTheoretical body tissue pressure versus ambient pressure for 20 and 90 cases, respectively;
fig. 3 is a schematic structural diagram of a diving protection system based on a diving computer according to an embodiment of the present application.
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a first aspect, the present invention provides a diving computer-based diving protection method based on ZH-L16 mathematical model, applied to a first decompression phase, see fig. 1, including steps S101 to S103:
step S101: obtaining a diving plan, the diving plan comprising: the depth of the diving destination, the time spent at the destination depth, the depth of each stop and the theoretical minimum time to be spent at each stop.
In this embodiment, the depth of the diving destination is 20 meters, the diving destination works for 90 minutes, a stop station is arranged every 3 meters, and the depth of the last stop station is 6 meters; the theoretical minimum time required for residence at each residence station is 3 minutes.
Step S102: in the first decompression phase, the theoretical body tissue minimum allowable environment absolute pressure is calculated by adopting a mathematical model with a gradient factor according to the diving plan.
Wherein the first decompression phase is a process of ascending to a last stop station at the diving destination.
In an optional embodiment, the method further comprises: determining the gradient factor according to a high empirical parameter, a low empirical parameter and a depth threshold; the value range of the high experience parameter is [0, 1], and the value range of the low experience parameter is [0, 1 ].
In this embodiment, the determining the gradient factor according to the high empirical parameter, the low empirical parameter and the depth threshold includes: subtracting the low empirical parameter from the high empirical parameter to obtain an empirical difference; subtracting the anchor point of the low empirical parameter from the anchor point of the high empirical parameter to obtain an anchor point difference value; subtracting the anchor point of the low empirical parameter from a depth threshold value to obtain a calibration difference value; and dividing the experience difference value by the anchor point difference value, multiplying the anchor point difference value by the calibration difference value, and adding the anchor point difference value and the calibration difference value to obtain the gradient factor.
Specifically, refer to formula one:
wherein, GFmaxBeing a gradient factor, GFlowFor low empirical parameters, GFhighFor high empirical parameters, ALFor anchor points corresponding to low empirical parameters, AHAn anchor point for a high empirical parameter, d a depth threshold,
for example, a current depth of 15 meters, at which depth the residence time is 3 minutes, then d is 4.5.
In this embodiment, the method may provide three according to the actual condition of the diverThe values for the low empirical parameter and the high empirical parameter are set, see Table I, which shows GFLowAnd GFHighConservative values and decompression free limits at different ratios.
Watch 1
As can be seen from the table, the smaller the ratio of GFLow to GFHigh, the higher the conservative value during the ascent of the dive, and the lower the decompression-free limit at the dive destination. In this embodiment, the GFLow and GFHigh values are 20% and 0.9tat, respectively, of the pressure at the diving destination.
In an alternative embodiment, the calculating the theoretical body tissue minimum allowable environment absolute pressure by using the mathematical model with the gradient factor includes: and determining the lowest allowable environment absolute pressure of the theoretical body tissue according to the inert gas tension of the current theoretical tissue, the gradient factor and a preset empirical threshold.
In an alternative embodiment, the empirical threshold comprises: a first empirical threshold and a second empirical threshold;
the determining the lowest allowable environment absolute pressure of the theoretical body tissue according to the inert gas tension of the current theoretical tissue, the gradient factor and a preset empirical threshold comprises the following steps: subtracting the product of the gradient factor and a first experience threshold value from the inert gas tension of the current theoretical tissue to obtain first data; dividing the gradient factor by the second empirical threshold to obtain a quotient, adding the quotient to the gradient factor, and subtracting a unit value to obtain second data; and dividing the first data by the second data to obtain the lowest allowable environment absolute pressure of the theoretical body tissue.
Specifically, refer to formula two:
wherein, GFmaxIs a gradient factor, PcompTo organize the inert gas tension, P, for the present theoryamb.tolThe theoretical body tissue minimum allowable ambient absolute pressure is a first empirical threshold, and b is a second empirical threshold.
In this example, the specific values of a and b are shown in table two, which shows the half-lives and values of a and b for different theoretical tissues in nitrogen and helium, respectively.
Watch two
For example, the fifth control interval has a nitrogen half-life of 27 minutes, so
In an optional embodiment, the method further comprises: acquiring theoretical tissue breathing inert gas pressure before diving and theoretical tissue breathing inert gas pressure at the current depth; subtract e from the value of one unit-tkObtaining third data, wherein e is a natural constant, t is a half-life period of the inert gas breathed by the tissue, and k is a half-saturation time constant of the inert gas breathed by the tissue; subtracting the theoretical tissue breathing inert gas pressure before diving from the theoretical tissue breathing inert gas pressure at the current depth to obtain fourth data; multiplying the third data and the fourth data to obtain fifth data; and adding the pressure of the inert gas breathed by the theoretical tissue before diving to the fifth data to obtain the tension of the inert gas of the current theoretical tissue.
Specifically, refer to formula three:
Pcomp＝Po+(Pi-Po)x((1-e-kt) Formula three
Wherein, PcompFor the current theoretical organization of inert gas tension, Pi is at the current depthTheoretical tissue breathing inert gas pressure at the current depth is equal to the alveolar pressure minus the water vapor pressure, Po is the theoretical tissue breathing inert gas pressure before diving, t is the half-life of the inert gas breathed by the tissue, k is the half-saturation time constant of the inert gas breathed by the tissue, and in the embodiment, the inert gas breathed by the tissue is nitrogen.
Step S103: and outputting prompt information which can continue to rise under the condition that the theoretical body tissue lowest allowable environment absolute pressure is less than or equal to the environment pressure of the next stop station, and the current stop station stop time is greater than or equal to the minimum time theoretically required to stop at the current stop station.
The gradient factor is used for reducing the difference value between the current theoretical tissue inert gas tension and the lowest allowable environment pressure, and is determined by the depth of the diving destination, the gradient reference factor, the current depth and the time of staying at the current depth.
Referring to fig. 2, according to prior theory, a graph of theoretical body tissue pressure versus ambient pressure may be divided into a supersaturation limit zone, a supersaturation zone, and an unsaturated zone based on the theoretical body tissue minimum allowable ambient absolute pressure. Wherein, can release inert gas at supersaturation district body tissue, avoid the diver to get decompression sickness, and the possibility that the diver can't avoid getting decompression sickness in supersaturation limit zone and unsaturated zone. Specifically, in the ascending process, after the diver arrives at the stop station and stops for 3 minutes, the system judges the value of the minimum allowable environment absolute pressure of the theoretical body tissue at intervals and compares the value with the corresponding value in the graph, specifically, for example, when the minimum allowable environment absolute pressure of the theoretical body tissue corresponds to the position of the point 1 in fig. 2, the diver is in a state of waiting for stopping at the stop station, and the minimum allowable environment absolute pressure of the theoretical body tissue starts to descend; when the theoretical body tissue minimum allowable ambient absolute pressure drops to a position corresponding to point 2 in fig. 2, the system outputs a prompt message to prompt that the rise can continue; this cycle reminds the diver to ascend when the diver ascends to the next stop and the lowest allowable ambient absolute pressure drops to a position corresponding to point 3 in fig. 2.
In the method, the gradient factor is used for reducing the difference value between the inert gas tension of the current theoretical tissue and the lowest allowable environment pressure of the current theoretical tissue, and the gradient factor is determined by the depth of a diving destination, a gradient reference factor, the current depth and the time of staying at the current depth, so that the corresponding lowest allowable environment absolute pressure of the theoretical body tissue is dynamically adjusted and monitored through a mathematical model with the gradient factor, the lowest allowable environment absolute pressure of the theoretical body tissue is less than or equal to the environment pressure of the next stop station, and prompt information is output to prompt that the diving personnel can continuously rise to ensure the physical health of the diving personnel when the staying time of the current stop station is greater than or equal to the minimum time theoretically required for staying at the current stop station.
In an optional embodiment, the method further comprises: in the second decompression stage, calculating by adopting a ZH-L16 mathematical model to obtain the lowest allowable environment absolute pressure of theoretical body tissues; and outputting prompt information to prompt that the rising can be continued under the condition that the theoretical body tissue lowest allowable environment absolute pressure is less than or equal to the environment pressure of the next stop station and the stop time of the current stop station is greater than or equal to the minimum time theoretically required for stopping at the current stop station. Wherein the second stage is a process of rising to the surface at the last stop.
Wherein, the calculation P in the ZH-L16 mathematical modelamb.toThe formula is formula four.
Pamb.tol＝(Pcomp-a) x b formula four
The parameters in the formula four are the same as the corresponding parameters in the formula two, and are not described herein again.
If the stopping rule stipulates that the last stopping station is at 6m, the theoretical body tissue minimum allowable environment absolute pressure P of the two stopping stationsamb.tolThe ratio of the ratio increases by an amplitude that becomes faster. Therefore, the possibility that the diving will not rise after the introduction of GF at the last stations is high, so the invention divides the diving rising process into two stages, thereby ensuring that the diver can go out quickly and safelyWater, in particular, see table three, which shows pamb. tol at 6m saturation for each theoretical tissue when breathing compressed air.
Watch III
According to the third table, under the condition that all theoretical tissues are saturated at the depth of 6m, Pamb.tol of the 1 st to 15 th tissues is less than the atmospheric pressure at the water surface, and only Pamb.tol of the 16 th theoretical tissues with the slowest half saturation time is close to the atmospheric pressure at the water surface. At this time, if GF is applied, pamb. tol values of the slowest theoretical tissues > atmospheric pressure at the water surface, so that water cannot be discharged. Therefore, the second stage is arranged for diving, and the fast and safe water outlet of a diver can be effectively ensured.
The action of reducing the pressure in stages can be further promoted by the action of the catalyst in the fourth stage, which is shown in the fourth stage in PcompAnd when 252kPa is taken and 70% of gradient factors are selected, respectively calculating to obtain pamb.tol through a second formula and a fourth formula, wherein pamb.tol without the pamb.tol corresponding to GF is calculated by the second formula, and pamb.tol with the pamb.tol corresponding to GF is calculated by the fourth formula.
Watch four
As can be seen from the table four, 16 different body tissues can theoretically bear more pressure, so that after GF is introduced in the first stage, the first station with the first station depth function is increased to a greater depth, so that the generation of bubbles in the ascending process can be reduced, and the incidence rate of the decompression sickness can be reduced. The gradient factor limits the extent to which the residence time at each station is extended, i.e., the lower the value set by the gradient factor, the more conservative the depressurization protocol. In the second stage, the diver can be effectively ensured to go out water quickly and safely.
In a second aspect, the present invention provides a diving computer-based diving protection system 200, applied in a first decompression phase, and referring to fig. 3, comprising:
a first obtaining module 201 configured to obtain a diving plan, the diving plan comprising: the depth of the diving destination, the time spent at the destination depth, the depth of each stop station and the theoretical minimum time to be spent at each stop station;
a first calculation module 202 configured to calculate a theoretical body tissue minimum allowable environment absolute pressure using a mathematical model with a gradient factor according to the diving plan in a first decompression phase;
a first output module 203, configured to output a prompt message to prompt that the body tissue can continue to rise if the theoretical body tissue minimum allowable ambient absolute pressure is less than or equal to the ambient pressure of the next station and the current station dwell time is greater than or equal to the theoretical minimum dwell time required at the current station;
the gradient factor is used for reducing the difference value between the current theoretical tissue inert gas tension and the lowest allowable environment pressure, and is determined by the depth of the diving destination, the gradient reference factor, the current depth and the time of staying at the current depth.
In an alternative embodiment, the first computing module 202 includes:
a determination submodule configured to determine the theoretical body tissue minimum allowable ambient absolute pressure based on a current theoretical tissue inert gas tension, the gradient factor and a preset empirical threshold.
In an alternative embodiment, the system 200 further comprises a determination module configured to determine the gradient factor based on a high empirical parameter, a low empirical parameter, and a depth threshold;
the value range of the high experience parameter is [0, 1], and the value range of the low experience parameter is [0, 1 ];
the determining module comprises:
a first calculation submodule configured to subtract the high experience parameter from the low experience parameter to obtain an experience difference value;
a second calculation submodule configured to subtract the anchor point of the low empirical parameter from the anchor point of the high empirical parameter to obtain an anchor point difference value;
a third computing submodule configured to subtract the anchor point of the low empirical parameter from a depth threshold to obtain a calibration difference;
and the fourth calculation sub-module is configured to divide the experience difference value by the anchor point difference value, multiply the anchor point difference value by the calibration difference value, and add the anchor point difference value and the calibration difference value to the low experience parameter to obtain the gradient factor.
The empirical thresholds include: a first empirical threshold and a second empirical threshold;
the determination submodule includes:
a first calculation unit configured to subtract the product of the gradient factor and a first empirical threshold from the current theoretical tissue inert gas tension to obtain first data;
a second calculation unit configured to add a quotient obtained by dividing the gradient factor by the second empirical threshold to the gradient factor and subtract a value of one unit to obtain second data;
a third calculation unit configured to divide the first data by the second data to obtain the theoretical body tissue minimum allowable environment absolute pressure.
In an alternative embodiment, the system 200 further comprises:
a second acquisition module configured to acquire theoretical tissue respiratory inert gas pressure before diving and theoretical tissue respiratory inert gas pressure at a current depth;
a second calculation module configured to subtract e from the value of one unit-tkObtaining third data, wherein e is a natural constant, t is a half-life period of the inert gas breathed by the tissue, and k is a half-saturation time constant of the inert gas breathed by the tissue;
the third calculation module is configured to subtract the theoretical tissue breathing inert gas pressure before diving from the theoretical tissue breathing inert gas pressure at the current depth to obtain fourth data;
a fourth calculating module configured to multiply the third data and the fourth data to obtain fifth data;
a fifth calculation module configured to add the theoretical tissue inert gas pressure before diving to the fifth data to obtain the current theoretical tissue inert gas tension.
In an alternative embodiment, applied to the second stage, the system 200 further comprises:
a sixth calculation module configured to calculate a theoretical body tissue minimum allowable environment absolute pressure by using a ZH-L16 mathematical model;
a second output module configured to output prompt information to prompt that the body tissue can continue to rise when the theoretical body tissue minimum allowable environment absolute pressure is less than or equal to the environment pressure of the next stop station and the current stop station stop time is greater than or equal to the minimum time theoretically required for stopping at the current stop station;
wherein the first phase is a process of ascending to the last stop at the diving destination, and the second phase is a process of ascending to the surface at the last stop.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
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