Simulation evaluation method for water emergency evacuation time of personnel in helicopter cockpit

Abstract

The invention belongs to the technical field of man-machine integration, and particularly relates to a simulation evaluation method for water emergency evacuation time of personnel in a helicopter cockpit. Comprising the following steps: S1, determining a cockpit emergency evacuation program; s2, emergency evacuation actions and postures of personnel in the cockpit are constructed; s3, carrying out a typical posture conversion test of the personnel in the cockpit, measuring posture conversion time through a test mode, and obtaining personnel motion data; s4, carrying out the analysis of the water emergency evacuation time of the personnel coupled with the sea wave cycle influence, and obtaining the emergency evacuation time of the personnel coupled with the sea wave cycle influence; and S5, integrating the analysis results of the evacuation time of each stage, and combining to obtain the total time consumption of emergency evacuation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of man-machine integration, and particularly relates to a simulation evaluation method for water emergency evacuation time of helicopter cockpit personnel. BACKGROUND

[0002] Helicopters are widely used in offshore search and rescue, offshore transportation, military and other fields due to their vertical take-off and landing and hovering in the air. When water ditching occurs, the personnel on the helicopter need to evacuate to a safe area in a very short time, and an efficient emergency evacuation procedure is the key to ensuring the safety of the personnel on the helicopter. In the evaluation of emergency evacuation time, existing evaluation methods mainly include computer modeling and simulation evaluation and test evaluation. The computer modeling and simulation evaluation method mainly uses discrete event simulation to establish an emergency evacuation model of the passenger cabin personnel for simulation evaluation, and the ground test evaluation method generally carries out ground evacuation test based on a simple physical prototype, records the evacuation time, and if necessary, carries out water pool test of the full-size prototype to evaluate the emergency evacuation time of the personnel.

[0003] The current research object is mainly the passenger cabin personnel, and there is a lack of research on the emergency evacuation of the cockpit personnel. Considering that the emergency evacuation channel of the cockpit personnel is quite different from that of the passenger cabin personnel, and the emergency evacuation procedure has a sequence requirement on the evacuation time of the passenger cabin personnel and the cockpit personnel, the emergency evacuation of the cockpit personnel also has an important influence on the whole process of the aircraft emergency evacuation. At the same time, in the emergency evacuation ground / water pool test, the test conditions are limited, and all scenarios cannot be simulated, so the influence of different sea state levels and other scenarios on the personnel emergency evacuation cannot be grasped. SUMMARY

[0004] The application aims to solve the above problems and provides a simulation evaluation method for water emergency evacuation time of helicopter cockpit personnel, which is helpful to grasp the emergency evacuation time of the helicopter cockpit in advance, optimize the emergency evacuation procedure, guide the design of the emergency evacuation channel and emergency equipment, and effectively improve the emergency evacuation efficiency of the helicopter cockpit personnel.

[0005] In order to solve the above technical solutions, A simulation evaluation method for water emergency evacuation time of helicopter cockpit personnel, the method comprising: S1, determining an emergency evacuation procedure of the cockpit; S2, constructing emergency evacuation actions and postures of the cockpit personnel; S3, carrying out a typical posture conversion test of the cockpit personnel, measuring the posture conversion time through the test method, and obtaining personnel motion data; S4, carrying out analysis on the water emergency evacuation time of the personnel coupled with the influence of sea wave period, and obtaining the emergency evacuation time of the personnel coupled with the influence of sea wave period. S5. By combining the analysis results of evacuation time at each stage, the total emergency evacuation time is obtained.

[0006] Furthermore, S1 specifically refers to: S11. Based on the helicopter's technical condition and emergency evacuation equipment, clarify the initial conditions for emergency evacuation. The initial conditions for emergency evacuation include the helicopter's floats being fully deployed, the helicopter reaching a stable floating state, and the helicopter's rotor stopping. Before these conditions are met, the cockpit personnel should remain in the cockpit, keep their seat belts fastened, and observe the surrounding environment. S12, Establish emergency evacuation conditions, including establishing emergency evacuation channels and activating emergency evacuation and rescue equipment. Activating emergency evacuation and rescue equipment includes putting on emergency oxygen equipment, launching the driver's lifeboat, and launching emergency exit glass. S13, begin emergency evacuation. The cockpit personnel unfasten their seatbelts, reach the helicopter's front float via the cockpit emergency exit, and then enter the water to complete the emergency evacuation.

[0007] Furthermore, S2 specifically refers to: Step 21: Decompose the cockpit emergency evacuation procedure and break down the personnel evacuation process into two types of evacuation actions. One type is the operation of emergency evacuation equipment, characterized by the fact that the personnel's initial and final postures are basically the same and their positions do not change. The other type is the personnel evacuation process, characterized by the fact that the personnel's initial and final postures are different and their positions change significantly. Step 22: Establish a cockpit personnel evacuation posture model, and construct the evacuation actions and basic postures of personnel with different percentile body sizes when passing through the evacuation channel; the evacuation channel is the path that cockpit personnel take to complete the emergency evacuation phase. Select the starting and ending postures for different actions during the emergency evacuation phase. Different actions during the emergency evacuation phase include: putting on emergency oxygen equipment, dropping the pilot lifeboat, dropping the emergency exit glass, unfastening the seat belt, passing through the cockpit emergency exit, reaching the front float of the helicopter, and then entering the water.

[0008] Furthermore, S3 specifically refers to: Step 31: Construct a physical prototype that resembles the cockpit space of the actual aircraft; Step 32: Select personnel with different percentile body sizes and conduct experiments according to different actions in the emergency evacuation phase constructed in Step 2. Use high-speed cameras to collect audio and video data and record the entire experimental process. Step 33: Analyze the experimental data to determine the time required for different posture transitions; Step 34: Compare the experimental postures with the theoretical analysis postures, supplement the missing experimental postures in the theoretical analysis postures, or delete unreasonable simulated postures in the theoretical analysis postures; according to the optimized evacuation posture model, re-collect and analyze the data.

[0009] Furthermore, in S4, based on the operational scenarios specified by the helicopter's top-level requirements, sea state data is determined. The sea state data includes at least: sea state level, the probability of different sea state levels occurring, and the wave cycle with the highest probability.

[0010] Furthermore, in S4, the attitude transition time analysis of the coupled wave cycle: comparing the personnel evacuation attitude transition time with the half-wave cycle time, including the following situations: If the sum of the attitude transition times from the first emergency evacuation to the i-th stage of evacuation is less than 1 / 2 wave period, and the sum of the attitude transition times from the first emergency evacuation to the i+1-th stage of evacuation is greater than 1 / 2 wave period, then the emergency evacuation from the first to the i-th stage shall be carried out within this 1 / 2 wave period. The calculation and analysis are carried out sequentially from the (i+1)th evacuation segment until the evacuation process ends.

[0011] Furthermore, if the attitude transition time of a single phase is greater than 1 / 2 wave cycle, the withdrawal attitude should be further decomposed in order to complete the attitude transition within several wave cycles.

[0012] Furthermore, S5 specifically refers to: The total emergency evacuation time for cockpit personnel was obtained by combining the evacuation posture transition time, the wave upswing cycle time, and the observation and waiting time.

[0013] In summary, the beneficial effects of the present invention are as follows: This invention, based on computer simulation tools and physical prototype testing, constructs a scientifically sound emergency evacuation model. For the first time, it couples the influencing factors of wave cycles and comprehensively analyzes the emergency evacuation time for cockpit personnel. Verification through a floating test on a certain type of helicopter shows that the evacuation time estimated by the method of this invention is basically consistent with the experimental results, proving the practicality and effectiveness of the method in engineering applications.

[0014] The method of this invention can provide theoretical support and practical guidance for research on emergency evacuation of personnel in helicopter cockpits. By improving the action process and optimizing the cockpit layout, it can effectively shorten the posture transition time and improve the efficiency of emergency evacuation.

[0015] The method of this invention comprehensively considers the impact of different sea states on emergency evacuation of personnel. It can extend the analysis of emergency evacuation in high sea states based on the test results in low sea states, and carry out a comprehensive assessment of emergency evacuation time of personnel. It effectively solves the technical problem that the emergency evacuation time of personnel under high sea states cannot be directly obtained due to the limitations of test conditions.

[0016] The method of this invention is simple and easy to implement, and the data can be reused. For different helicopter cockpit personnel emergency evacuation time assessment needs, only a small number of posture conversion tests are required to quickly complete the analysis of cockpit personnel emergency evacuation time. The assessment efficiency is high and the scope of application is wide. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the analytical logic of a simulation evaluation method for emergency evacuation time of helicopter cockpit personnel on water, provided in an embodiment of the present invention. Figure 2 A diagram illustrating an emergency evacuation procedure for cockpit personnel is provided as an embodiment of the present invention. Figure 3 Analysis of emergency evacuation time for cockpit personnel under sea state 5, provided for embodiments of the present invention. Detailed Implementation

[0018] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] The technical solution provided by this invention is as follows: A simulation and evaluation method for emergency evacuation time of helicopter cockpit personnel on water. Based on the relevant standards and specifications for helicopter emergency evacuation, and considering the technical condition and emergency evacuation design of the helicopter cockpit, an emergency evacuation procedure for cockpit personnel is designed. This procedure is further decomposed into emergency evacuation actions and postures. Time data for different evacuation posture transitions are obtained through simulation analysis and experiments. The influence of ocean wave cycle data on posture transition time is coupled in, and a comprehensive analysis is performed to obtain the total emergency evacuation time for cockpit personnel. The method includes the following steps: Step 1: Develop cockpit emergency evacuation procedures. This involves reviewing relevant standards and specifications for helicopter emergency evacuation to establish top-level requirements for helicopter cockpit emergency evacuation; and then developing the helicopter cockpit emergency evacuation procedures based on the helicopter's technical condition, the emergency evacuation equipment it carries, and other top-level requirements. Step 2: Construct emergency evacuation actions and postures for cockpit personnel. Using computer simulation analysis technology, and fully considering the influence of physiological factors such as different personnel body sizes, and environmental factors such as cockpit workspace and emergency evacuation equipment, the evacuation actions and basic postures of personnel during emergency evacuation in the cockpit are constructed. Step 3: Conduct typical cockpit posture transition tests. Design and conduct typical posture transition tests to measure posture transition time and obtain personnel motion data. Step 4: Conduct an analysis of the impact of coupled ocean wave cycles on personnel emergency evacuation time at sea. Based on the helicopter operation scenario, identify the operating sea area, analyze the ocean wave movement patterns, select appropriate sea conditions for analysis, process and formulate coupling principles, and obtain the personnel emergency evacuation time affected by coupled ocean wave cycles; Step 5: Combine the analysis results of evacuation time at each stage to obtain the total emergency evacuation time.

[0020] Furthermore, in the process of developing the cockpit emergency evacuation procedure as described above, in step 1, The requirements for emergency evacuation of the top deck from the cockpit include: S11, the relevant standards and specifications for helicopter emergency evacuation mainly refer to Airworthiness Regulations Part 27 or 29, specifically involving Article 801 Water Landing, Article 803 Emergency Evacuation, Article 805 Emergency Exits for Flight Crew, Article 809 Arrangement of Emergency Exits, Article 811 Marking of Emergency Exits, Article 812 Emergency Lighting, Article 1411 General Provisions, and Article 1415 Water Landing Equipment, etc.

[0021] S12, based on the above clauses, formulate top-level requirements applicable to emergency evacuation from the cockpit, including specific requirements for emergency exit location, exit size, passageway, evacuation time, etc.

[0022] The cockpit emergency evacuation procedure includes: S21. Based on the helicopter's technical condition and emergency evacuation equipment, define the initial conditions for emergency evacuation, including but not limited to the helicopter's floats being fully deployed, the helicopter reaching a stable floating state, and the helicopter rotor stopping. Prior to this, cockpit personnel should remain in the cockpit, keep their seatbelts fastened, and observe the surrounding environment. S22, Establish emergency evacuation conditions. This includes establishing emergency evacuation routes and activating emergency evacuation and lifesaving equipment. Specific operations include, but are not limited to, putting on emergency oxygen equipment, launching the driver's lifeboat (if equipped), and launching emergency exit windows, etc., to prepare to begin evacuation; S23, optional: if there are passengers in the cabin, the cockpit personnel should, after establishing the cockpit evacuation route, direct the passengers to complete the emergency evacuation. S24, Initiate emergency evacuation. Cockpit personnel unfasten their seatbelts, proceed through the cockpit emergency exit to the helicopter's forward float, and then enter the water to complete the emergency evacuation. S25: The cockpit personnel swam to the vicinity of the lifeboat, climbed onto it, disconnected the lifeboat from the helicopter, rowed away from the helicopter to a safe area, and awaited further rescue operations. According to airworthiness regulations, evacuation is considered complete once personnel have left the aircraft and reached the ground / entered the water. The stage of personnel reaching the safe zone is not considered when analyzing the total emergency evacuation time.

[0023] Furthermore, in the process of constructing emergency evacuation actions and postures for cockpit personnel as described above, step 2 includes: Step 21: Decompose the cockpit emergency evacuation procedure, divide it into emergency evacuation phases (S22 and S24), and decompose the personnel evacuation process into two types of evacuation actions. One type is the operation of emergency evacuation equipment, characterized by the personnel's initial and final postures being basically the same and their positions not changing. The other type is the personnel evacuation action process, characterized by the personnel's initial and final postures being different and their positions changing significantly. Step 22: Establish a cockpit personnel evacuation posture model. Based on the helicopter's technical condition and emergency evacuation equipment, and considering environmental factors such as the cockpit evacuation route and the cockpit waterline during a water landing, computer simulation software is used to construct the evacuation actions and basic postures of personnel with different percentile body sizes when passing through the evacuation route (the path taken by cockpit personnel to complete the emergency evacuation phase). The starting and ending postures of different actions during the emergency evacuation phase are selected, and the transition process between typical postures is analyzed in detail. Different actions during the emergency evacuation phase include: putting on emergency oxygen equipment, dropping the pilot lifeboat, dropping the emergency exit glass, unfastening the seat belt, passing through the cockpit emergency exit, reaching the helicopter's front float, and then entering the water.

[0024] Furthermore, in the typical cockpit occupant posture transition test as described above, step 3 includes: Step 31, Physical Prototype Construction. A physical prototype similar in space to the actual cockpit of the aircraft is constructed; this can be simplified depending on the experimental requirements. Step 33, Experiment Implementation. Personnel with different percentile body sizes were selected, and experiments were conducted according to different actions during the emergency evacuation phase as defined in Step 2. High-speed cameras were used to collect audio and video data and record the entire experimental process. Step 34, Data Analysis. A detailed analysis of the experimental data is conducted to determine the time required for different posture transitions; Step 35: Optimization Suggestions and Verification. Compare the experimental postures with the theoretical analysis postures, supplementing the theoretical analysis postures with any missing experimental postures, or removing unreasonable simulated postures. Based on the optimized evacuation posture model, re-collect and analyze data to verify the effectiveness of the improvement measures.

[0025] By following the steps above, we can systematically obtain the emergency evacuation procedures and evacuation time for cockpit personnel when the helicopter is in a relatively stationary state, and improve emergency evacuation efficiency through optimization and improvement measures.

[0026] Considering helicopter emergency landings on water, in calm water, the helicopter can maintain a relatively stable afloat, and the operation of the cockpit personnel and equipment is relatively easy. However, when the water surface experiences waves of varying degrees, the combined system of the helicopter and its flotation system will experience periodic fluctuations and swaying, affecting the afloatation stability and the personnel evacuation process, and even posing safety hazards. Therefore, it is necessary to analyze the impact of water surface movement patterns on the emergency evacuation of helicopter cockpit personnel.

[0027] Furthermore, in the process of conducting the analysis of personnel emergency evacuation time at sea coupled with the influence of ocean wave cycles, as described above, step 4 includes: The coupling principle was established. Under different sea states, wave period and wave height are key factors affecting the floating stability of helicopters. Wave height refers to the height from the trough to the crest of a wave, while wave period is the interval between two consecutive wave crests. If an evacuation maneuver is performed while the helicopter is in its upward motion cycle, the significant relative speed between the helicopter cockpit structure and the personnel may pose a safety hazard.

[0028] Therefore, in high sea states, it is clear that the cockpit personnel should perform evacuation maneuvers while the helicopter is moving downhill with the waves, that is, from the crest to the trough of the wave.

[0029] Wave cycle data selection. Based on the operational scenario specified in the helicopter's top-level requirements, sea state data is determined. The sea state data should include at least: sea state level, the probability of different sea state levels occurring, and the wave cycle with the highest probability.

[0030] Attitude transition time analysis of coupled wave cycles. Compare the attitude transition time of personnel evacuation with the time of half a wave cycle, including the following cases: If the sum of the attitude transition times from the first emergency evacuation to the i-th stage of evacuation is less than 1 / 2 wave period, and the sum of the attitude transition times from the first emergency evacuation to the i+1-th stage of evacuation is greater than 1 / 2 wave period, then the emergency evacuation from the first to the i-th stage shall be carried out within this 1 / 2 wave period. The calculation and analysis are carried out sequentially from the (i+1)th evacuation segment until the evacuation process ends.

[0031] If the attitude transition time of a single phase is greater than 1 / 2 wave cycle, the evacuation attitude should be further decomposed in order to complete the attitude transition within several wave cycles.

[0032] Step 5: Comprehensive Analysis of Cockpit Personnel Emergency Evacuation Time. Based on the above steps, the evacuation posture transition time is calculated, and the wave upturn cycle time and observation waiting time are superimposed to obtain the total emergency evacuation time for cockpit personnel.

[0033] Taking the emergency evacuation of a certain type of helicopter cockpit as an example, a simulation evaluation method for the emergency evacuation time of helicopter cockpit personnel on water is provided, including the following steps: S1. Based on airworthiness emergency evacuation requirements and the technical condition of the cockpit, formulate personnel emergency evacuation procedures.

[0034] The cockpit features a side-by-side two-seat configuration with two emergency exits located on the side cockpit doors. These exits, accessible via the jettisoned door glass, form a Class IV emergency exit, measuring 628mm (average) in width and 767mm in height. Two externally mounted jettisonable lifeboats are located outside the cockpit for pilot evacuation, with jettison handles installed inside the cockpit. Cockpit personnel wear neck vests and emergency oxygen equipment. A float system is installed on the exterior of the cockpit; when inflated and deployed, the floats do not obstruct the emergency exits. Analysis indicates that the helicopter cockpit emergency evacuation design complies with relevant airworthiness requirements, and the established emergency evacuation procedures are attached. Figure 2 It includes four stages: confirming the emergency evacuation status, establishing emergency evacuation conditions, emergency evacuation, and follow-up actions after evacuation.

[0035] S2, Construct emergency evacuation actions and postures for cockpit personnel. Decompose the cockpit personnel emergency evacuation procedure to obtain the following two types of emergency evacuation actions: Emergency evacuation equipment operation steps: drop the driver's lifeboat, tear off the window sealant, push down the window, unfasten the driver's seat belt, open the neck-type life jacket, and put on the emergency oxygen equipment; Emergency evacuation procedures: Evacuate from the seat to the emergency exit in the cockpit; evacuate from the emergency exit in the cockpit to the front buoy; evacuate from the front buoy into the water.

[0036] For the first category of emergency evacuation equipment operation actions, since these involve specific equipment operations, typical action times are obtained by combining equipment performance verification tests or accumulated experience in model development. Specific time data is shown in the table below.

[0037] Table 2 Typical Time Consumption for Emergency Evacuation Equipment Operations

[0038] For the second type of emergency evacuation action, computer simulation analysis technology was used. Based on the cockpit electronic prototype, the evacuation actions of personnel with the 5th percentile, 50th percentile, and 95th percentile human body dimensions were analyzed respectively. The starting and ending postures of the emergency evacuation action were selected as typical postures. The transition process between typical postures was analyzed in detail, and the intermediate postures that need to be experienced in the transition process were determined, thus constructing a complete personnel emergency evacuation posture model.

[0039] S3. Based on the evacuation postures obtained in the above steps, design and conduct a typical posture transition experiment for personnel, measure the posture transition time through the experiment, and obtain personnel evacuation data.

[0040] First, a physical prototype was constructed. Since the personnel evacuation procedures were clearly defined, only the structures affecting cockpit evacuation needed to be built to meet the test requirements; there was no need to construct the entire cockpit physical prototype. The physical prototype constructed for this test included the seat basin structure, the cockpit emergency exit structure, and the front float structure, whose relative positions were consistent with the actual aircraft cockpit.

[0041] Next, personnel with different percentile body sizes, ranging from 158 cm to 178 cm in height, were selected to conduct emergency evacuation tests according to the typical and intermediate postures constructed in step 2. Audio and video data were collected during the tests using a high-speed camera. The personnel began evacuation upon hearing the start command, and the test ended upon reaching the ground.

[0042] Then, the experimental data was analyzed in detail to obtain the time data for emergency evacuation actions of the cockpit personnel. Simultaneously, the differences between the experimental postures and the theoretically analyzed postures were compared, and subjective evaluations from the experimental personnel were incorporated to improve the emergency evacuation design and evacuation posture model. Data was then collected and analyzed again according to the optimized evacuation posture model to verify the effectiveness of the improvement measures. Specific time data are shown in the table below.

[0043] Table 3 Typical Time Consumption for Emergency Evacuation of Personnel

[0044] Through the above steps, the emergency evacuation procedures and evacuation time for cockpit personnel when the helicopter is in a relatively stationary state were systematically obtained.

[0045] S4. Based on the helicopter's operating sea area and sea condition data, conduct an analysis of the time of emergency evacuation of personnel on water coupled with the influence of ocean wave cycles.

[0046] The overall development requirements for this type of helicopter stipulate that the emergency evacuation sea state must be Class 5. According to relevant data, the predicted wave cycle for Class 5 sea state in the Northern Hemisphere high seas ranges from 7 to 16.5 seconds, with the most probable wave cycle being 10 seconds.

[0047] Based on the coupling principle established in the above steps, by comparing the time taken for emergency evacuation with the wave's downward cycle (i.e., half the wave cycle, 5 seconds), and comprehensively analyzing the evacuation time at each stage, the coupling results are as follows: Evacuate from the seat to the window. If the evacuation begins during an upward wave cycle, wait for one upward wave cycle before starting; if the evacuation begins during a downward wave cycle, no waiting is required. The average time to evacuate from the seat to the window is 8 seconds, exceeding one downward wave cycle. Therefore, this action needs to be performed in two steps: first, evacuate from the seat to near the window and wait for one upward wave cycle; second, evacuate to the window, taking 15 seconds. Therefore, the total time for this action is between 15 and 20 seconds.

[0048] Evacuate from the window to the forward buoy. The evacuation must wait for one wave up cycle before commencing. The average time for evacuation from the window to the forward buoy is 5 seconds, which does not exceed one wave down cycle. Therefore, the total time for this maneuver is 10 seconds.

[0049] Enter the water through the front float. Wait for one wave up cycle (during which time open the neck-type life jacket) before beginning the evacuation. The average time to enter the water through the front float is 3 seconds, which does not exceed one wave down cycle. Therefore, the total time for this maneuver is 8 seconds.

[0050] Since the operation of emergency evacuation equipment is largely unaffected by sea conditions, the time taken under sea state 5 is consistent with the typical time. Based on the above analysis, the total time for emergency evacuation of personnel coupled with the wave cycle of sea state 5 is 73 to 78 seconds. For specific data, please refer to [link to relevant data]. Figure 3 .

[0051] Further analysis shows that the time (3 seconds) to open the neck-type life vest has been included in the time it takes for personnel to enter the water from the front float, so the revised total emergency evacuation time is 70 to 75 seconds.

[0052] This invention, based on computer simulation tools and physical prototype testing, constructs a scientifically sound emergency evacuation model. For the first time, it couples the influencing factors of wave cycles and comprehensively analyzes the emergency evacuation time for cockpit personnel. Verification through a floating test on a certain type of helicopter shows that the evacuation time estimated by the method of this invention is basically consistent with the experimental results, proving the practicality and effectiveness of the method in engineering applications.

[0053] The method of this invention can provide theoretical support and practical guidance for research on emergency evacuation of personnel in helicopter cockpits. By improving the action process and optimizing the cockpit layout, it can effectively shorten the posture transition time and improve the efficiency of emergency evacuation.

[0054] The method of this invention comprehensively considers the impact of different sea states on emergency evacuation of personnel. It can extend the analysis of emergency evacuation in high sea states based on the test results in low sea states, and carry out a comprehensive assessment of emergency evacuation time of personnel. It effectively solves the technical problem that the emergency evacuation time of personnel under high sea states cannot be directly obtained due to the limitations of test conditions.

[0055] The method of this invention is simple and easy to implement, and the data can be reused. For different helicopter cockpit personnel emergency evacuation time assessment needs, only a small number of posture conversion tests are required to quickly complete the analysis of cockpit personnel emergency evacuation time. The assessment efficiency is high and the scope of application is wide.

Claims

1. A method for simulating and evaluating the time required for emergency evacuation of personnel from a helicopter cockpit over water, characterized in that, The method includes: S1, determine the cockpit emergency evacuation procedure; S2, Construct emergency evacuation actions and postures for cockpit personnel; S3, Conduct typical posture transition tests for cockpit personnel, measure posture transition time through test methods, and obtain personnel motion data; S4, Conduct an analysis of the personnel emergency evacuation time on water under the influence of coupled ocean wave cycles, and obtain the personnel emergency evacuation time under the influence of coupled ocean wave cycles; S5. By combining the analysis results of evacuation time at each stage, the total emergency evacuation time is obtained.

2. The method for simulating and evaluating the emergency evacuation time of helicopter cockpit personnel on water as described in claim 1, characterized in that, S1 specifically refers to: S11. Based on the helicopter's technical condition and emergency evacuation equipment, clarify the initial conditions for emergency evacuation. The initial conditions for emergency evacuation include the helicopter's floats being fully deployed, the helicopter reaching a stable floating state, and the helicopter's rotor stopping. Before these conditions are met, the cockpit personnel should remain in the cockpit, keep their seat belts fastened, and observe the surrounding environment. S12, Establish emergency evacuation conditions, including establishing emergency evacuation channels and activating emergency evacuation and rescue equipment. Activating emergency evacuation and rescue equipment includes putting on emergency oxygen equipment, launching the driver's lifeboat, and launching emergency exit glass. S13, begin emergency evacuation. The cockpit personnel unfasten their seatbelts, reach the helicopter's front float via the cockpit emergency exit, and then enter the water to complete the emergency evacuation.

3. The simulation and evaluation method for emergency evacuation time of helicopter cockpit personnel on water as described in claim 2, characterized in that, S2 specifically refers to: Step 21: Decompose the cockpit emergency evacuation procedure and break down the personnel evacuation process into two types of evacuation actions. One type is the operation of emergency evacuation equipment, characterized by the fact that the personnel's initial and final postures are basically the same and their positions do not change. The other type is the personnel evacuation process, characterized by the fact that the personnel's initial and final postures are different and their positions change significantly. Step 22: Establish a cockpit personnel evacuation posture model, and construct the evacuation actions and basic postures of personnel with different percentile body sizes when passing through the evacuation channel; the evacuation channel is the path that cockpit personnel take to complete the emergency evacuation phase. Select the starting and ending postures for different actions during the emergency evacuation phase. Different actions during the emergency evacuation phase include: putting on emergency oxygen equipment, dropping the pilot lifeboat, dropping the emergency exit glass, unfastening the seat belt, passing through the cockpit emergency exit, reaching the front float of the helicopter, and then entering the water.

4. The simulation and evaluation method for emergency evacuation time of helicopter cockpit personnel on water as described in claim 3, characterized in that, S3 specifically refers to: Step 31: Construct a physical prototype that resembles the cockpit space of the actual aircraft; Step 32: Select personnel with different percentile body sizes and conduct experiments according to different actions in the emergency evacuation phase constructed in Step 2. Use high-speed cameras to collect audio and video data and record the entire experimental process. Step 33: Analyze the experimental data to determine the time required for different posture transitions; Step 34: Compare the experimental postures with the theoretical analysis postures, supplement the missing experimental postures in the theoretical analysis postures, or delete unreasonable simulated postures in the theoretical analysis postures. Based on the optimized evacuation posture model, data was collected and analyzed again.

5. The simulation and evaluation method for emergency evacuation time of helicopter cockpit personnel on water as described in claim 4, characterized in that, In S4, sea state data is determined based on the operational scenarios specified by the helicopter's top-level requirements. The sea state data includes at least: sea state level, the probability of different sea state levels occurring, and the wave cycle with the highest probability.

6. The simulation and evaluation method for emergency evacuation time of helicopter cockpit personnel on water as described in claim 5, characterized in that, In S4, attitude transition time analysis of coupled wave cycle: compare the attitude transition time of personnel evacuation with the time of half wave cycle, including the following situations: If the sum of the attitude transition times from the first emergency evacuation to the i-th stage of evacuation is less than 1 / 2 wave period, and the sum of the attitude transition times from the first emergency evacuation to the i+1-th stage of evacuation is greater than 1 / 2 wave period, then the emergency evacuation from the first to the i-th stage shall be carried out within this 1 / 2 wave period. The calculation and analysis are carried out sequentially from the (i+1)th evacuation segment until the evacuation process ends.

7. The simulation and evaluation method for emergency evacuation time of helicopter cockpit personnel on water as described in claim 6, characterized in that, If the attitude transition time of a single phase is greater than 1 / 2 wave cycle, the evacuation attitude should be further decomposed in order to complete the attitude transition within several wave cycles.

8. The method for simulating and evaluating the emergency evacuation time of helicopter cockpit personnel on water as described in claim 1, characterized in that, S5 specifically refers to: The total emergency evacuation time for cockpit personnel was obtained by combining the evacuation posture transition time, the wave upswing cycle time, and the observation and waiting time.

9. A simulation and evaluation system for emergency evacuation time of personnel from a helicopter cockpit on water, characterized in that, The system is used to perform the method as described in any one of claims 1-8.

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