Test method for pressure-resistant working condition of underwater equipment

Abstract

The invention relates to an underwater equipment pressure-resistant working condition test method, the underwater equipment is internally provided with a variable pressure cabin and a normal pressure cabin, the test method comprises the following steps: the underwater equipment is arranged in a pressure cylinder, the pressure cylinder is connected with a first pressure increasing and releasing system, and the variable pressure cabin is connected with a second pressure increasing and releasing system located outside the pressure cylinder; the control system obtains external pressure data and internal pressure data of the underwater equipment under the pressure-resistant working condition; the first pressure increasing and releasing system and the second pressure increasing and releasing system are started, the first pressure increasing and releasing system controls the pressure in the pressure cylinder according to the external pressure data, the second pressure increasing and releasing system controls the pressure in the variable pressure cabin according to the internal pressure data, and the pressure-resistant structure of the underwater equipment is made to be in the target stress state; in the target stress state, the bearing capacity of the target position on the pressure-resistant structure is verified, so that the stress conditions of the pressure-resistant structure inside and outside the underwater equipment in the working process are simulated and tested, and the bearing capacity of the pressure-resistant structure is verified comprehensively.

Description

Technical Field

[0001] The invention relates to the field of measurement and detection technology, in particular to a test method for pressure-resistant working conditions of underwater equipment. Background Art

[0002] Using a deep-sea environment simulation test device (referred to as "pressure cylinder") to conduct hydrostatic pressure testing is an important means of studying the safety performance of pressure-resistant structures of underwater equipment such as submarines. Its working principle is to place the pressure-resistant structure model in the pressure cylinder and control the water pressure in the pressure cylinder through a loading and unloading system, thereby achieving pressure simulation of the underwater equipment structure model.

[0003] At present, test load simulation is generally carried out by simulating external pressure conditions to test the safety performance of pressure-resistant structures. However, with the increasing requirements for the refinement of the test, it is necessary to analyze the stress conditions of the pressure-resistant structures of underwater equipment under different states during operation. There is an urgent need for a new test method for pressure-resistant conditions of underwater equipment. Summary of the invention

[0004] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a test method for the pressure resistance of underwater equipment, thereby realizing simulation testing of the stress conditions of the internal and external pressure-resistant structures of the underwater equipment during operation and verifying the comprehensive bearing capacity of the pressure-resistant structure.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A test method for pressure-resistant working conditions of underwater equipment, wherein the underwater equipment is provided with a variable pressure cabin and a normal pressure cabin, and the test method comprises the following steps:

[0007] The underwater equipment is placed in a pressure cylinder, the pressure cylinder is connected to a first pressure-adding and pressure-relieving system, and the variable pressure chamber is connected to a second pressure-adding and pressure-relieving system located outside the pressure cylinder;

[0008] The control system obtains external pressure data and internal pressure data of the underwater equipment under the pressure-resistant working condition;

[0009] Starting the first pressure-adding and pressure-relief system and the second pressure-adding and pressure-relief system, wherein the first pressure-adding and pressure-relief system controls the pressure in the pressure cylinder according to the external pressure data, and the second pressure-adding and pressure-relief system controls the pressure in the pressure-changing chamber according to the internal pressure data, so that the pressure-resistant structure of the underwater equipment is in a target stress state;

[0010] Under the target stress state, the load-bearing capacity of the target position on the pressure-resistant structure is verified.

[0011] As a further improvement of the above technical solution:

[0012] The external pressure data is used to simulate the water pressure at a specific water depth, and the internal pressure data is used to simulate the change in the pressure inside the cabin during the operation of the underwater equipment.

[0013] The second pressure-adding and pressure-releasing system comprises an accumulator, an adapter and a second liquid storage tank located outside the pressure cylinder, the liquid pressure in the accumulator is the liquid supply pressure, and the number of the adapters is consistent with the number of the pressure-changing chambers and corresponds one to one;

[0014] The adapter is provided with a liquid storage cavity, the liquid storage cavity is communicated with the corresponding variable pressure chamber, the internal pressure data includes a pressure requirement value of each variable pressure chamber, the liquid supply pressure is greater than or equal to the pressure requirement value, and the adapter is equipped with a sensor for detecting the pressure in the liquid storage cavity;

[0015] The second pressure increase and release system controls the pressure in the variable pressure cabin according to the internal pressure data, comprising the following steps:

[0016] The control system obtains the pressure signal from the sensor, and adjusts the amount of liquid in the accumulator entering the liquid storage chamber according to the pressure demand value of the variable pressure chamber, or adjusts the amount of liquid in the liquid storage chamber entering the second liquid storage tank.

[0017] The accumulator is connected to the liquid storage chamber via a boosting pipeline, and a first valve is provided on the boosting pipeline; the liquid storage chamber is connected to the second liquid storage tank via a pressure relief pipeline, and a second valve is provided on the pressure relief pipeline, and both the first valve and the second valve are regulating valves and are electrically connected to the control system;

[0018] By adjusting the opening and closing of the first valve, the amount of liquid in the accumulator entering the pressure-changing chamber is adjusted;

[0019] By adjusting the opening and closing of the second valve, the amount of liquid in the pressure-changing chamber entering the second liquid storage tank is adjusted.

[0020] The pressure demand value includes the pressure change speed, the upper pressure limit and the lower pressure limit in the variable pressure cabin, and the lower pressure limit is normal pressure;

[0021] Under the target stress state, the pressure in the variable pressure cabin fluctuates, and the load-bearing capacity of the target position on the pressure-resistant structure is verified during the pressure fluctuation.

[0022] The pressure requirement value includes the upper limit of the pressure in the pressure-changing cabin;

[0023] Under the target stress state, when the internal pressure of the variable pressure cabin reaches the upper pressure limit, the load-bearing capacity of the target position on the pressure-resistant structure is verified.

[0024] The number of the pressure-changing cabins is greater than or equal to two, and the target position includes a junction position between the pressure-changing cabin and the normal pressure cabin, and a junction position between adjacent pressure-changing cabins.

[0025] The pressure-resistant working condition includes a projectile launching working condition, and the variable-pressure cabin includes a launching cabin.

[0026] The pressure-resistant working condition includes the gravity adjustment working condition of underwater equipment, and the variable pressure compartment includes a ballast tank.

[0027] The first pressure-increasing and pressure-relieving system includes a high-pressure pump group and a first liquid storage tank. The water outlet of the high-pressure pump group is connected to the pressure cylinder, and the water inlet of the high-pressure pump group is connected to the first liquid storage tank. A discharge pipeline is also provided on the pressure cylinder, and the discharge pipeline is connected to the first liquid storage tank.

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention has a compact and reasonable structure and is easy to operate. A variable pressure cabin and a normal pressure cabin are arranged inside the underwater equipment model to simulate the distribution of the underwater equipment cabins. Two sets of pressurization and pressure relief systems are used to apply pressure to the inside and outside of the underwater equipment respectively to simulate the working state of the underwater equipment, thereby realizing a simulated test of the stress conditions of the internal and external pressure-resistant structures of the underwater equipment during the working process and verifying the comprehensive bearing capacity of the pressure-resistant structure.

[0030] At the same time, the present invention also has the following advantages:

[0031] The liquid storage chamber located in the adapter is connected to the pressure transformer cabin, and the pressure transformer cabin is connected to the pressurization unit and the pressure relief unit through the adapter. By detecting and controlling the pressure of the liquid in the liquid storage chamber, the pressure of the pressure transformer cabin is indirectly detected and controlled, thereby realizing independent control of the pressure in multiple pressure transformer cabins, realizing the adjustment and testing of various pressure-resistant working conditions, and conducting a comprehensive verification of the bearing capacity of the pressure-resistant structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention.

[0033] Figure 2 It is a schematic diagram of the structure of the adapter of the present invention.

[0034] Figure 3 It is a schematic diagram of the present invention in working state (I).

[0035] Figure 4 It is a schematic diagram of the present invention in working state (II).

[0036] Figure 5 It is a schematic diagram (three) of the present invention in working state.

[0037] Figure 6 It is a schematic diagram (four) of the present invention in working state.

[0038] in:

[0039] 1. Underwater equipment; 11. Variable pressure cabin; 12. Normal pressure cabin;

[0040] 2. Pressure cylinder; 3. First pressure relief system;

[0041] 4. Adapter; 401. Liquid storage chamber; 402. First instrument interface; 403. Pressure-resistant cylinder; 404. Liquid discharge port; 405. Pressure inlet port; 406. Communication port; 407. Pressure outlet port; 408. Second instrument interface;

[0042] 41. Connecting pipeline; 42. Pressurizing pipeline; 421. Second valve;

[0043] 43. Pressure relief pipeline; 431. Second valve;

[0044] 44. Signal line; 45. Sensor;

[0045] 5. Control system; 6. Second liquid storage tank; 7. Accumulator; 8. Connecting pipe; 81. Connecting valve. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0047] Embodiment 1:

[0048] like Figure 1 As shown, the test method for the pressure resistance of underwater equipment in this embodiment, the underwater equipment 1 is provided with a variable pressure cabin 11 and a normal pressure cabin 12, and the test method includes the following steps:

[0049] The underwater equipment 1 is placed in the pressure cylinder 2, the pressure cylinder 2 is connected to the first pressure-adding and pressure-relief system 3, and the pressure-changing chamber 11 is connected to the second pressure-adding and pressure-relief system outside the pressure cylinder 2;

[0050] The control system 5 obtains the external pressure data and the internal pressure data of the underwater equipment 1 under the pressure-resistant working condition;

[0051] Start the first pressure-adding and pressure-relief system 3 and the second pressure-adding and pressure-relief system. The first pressure-adding and pressure-relief system 3 controls the pressure in the pressure cylinder 2 according to the external pressure data, and the second pressure-adding and pressure-relief system controls the pressure in the variable pressure chamber 11 according to the internal pressure data, so that the pressure-resistant structure of the underwater equipment 1 is in the target stress state;

[0052] Under the target stress state, the bearing capacity of the target position on the pressure-resistant structure is verified.

[0053] Specifically, the underwater equipment 1 is a scaled-down equipment model, which may be a submarine, an underwater work platform or other equipment; a variable pressure cabin 11 and a normal pressure cabin 12 are arranged in the underwater equipment 1 to simulate the cabin distribution in the underwater equipment 1, wherein the pressure in the normal pressure cabin 12 is normal pressure, and the pressure in the variable pressure cabin 11 is pressure-controlled according to the type and working conditions of the underwater equipment 1; the number and distribution of the variable pressure cabins 11 are related to the type and function of the underwater equipment 1, which may be one or more, generally more than one.

[0054] The control system 5 may include a PLC (Programmable Logic Controller), and the withstand voltage working condition data is sent to the control system 5 through a human-machine interface. The human-machine interface includes a display device and an input device. The input device is used for an operator to input the relevant data of the withstand voltage working condition, and the display device may be an electronic screen. The relevant data of the withstand voltage working condition may be multiple sets of data set according to specific circumstances, and multiple tests are performed sequentially for the multiple sets of data.

[0055] A stress sensor is pre-installed at the target position on the pressure-resistant structure to detect and record the stress conditions during the test. The stress sensor can be a strain gauge. The measuring wire is connected to the control system 5 after passing through the cabin penetration. After the control system 5 stores and records the measurement data, it further performs data analysis to obtain the verification result of the bearing capacity of the pressure-resistant structure.

[0056] In the test, water is usually used as the pressurized medium.

[0057] A variable pressure cabin 11 and a normal pressure cabin 12 are arranged inside the model of the underwater equipment 1 to simulate the cabin distribution of the underwater equipment 1. Two sets of pressurization and pressure relief systems are used to apply pressure to the inside and outside of the underwater equipment 1 respectively to simulate the working state of the underwater equipment 1, thereby realizing a simulated test of the stress conditions of the internal and external pressure-resistant structures of the underwater equipment 1 during the working process and verifying the comprehensive bearing capacity of the pressure-resistant structure.

[0058] The first pressure-increasing and depressurizing system 3 includes a high-pressure pump group and a first liquid storage tank. The water outlet of the high-pressure pump group is connected to the pressure cylinder 2, and the water inlet of the high-pressure pump group is connected to the first liquid storage tank. A discharge pipeline is also provided on the pressure cylinder 2, and the discharge pipeline is connected to the first liquid storage tank. The high-pressure pump group is used to increase the pressure in the pressure cylinder 2, and the discharge pipeline is used to depressurize the pressure cylinder 2, so that the pressure in the pressure cylinder 2 is consistent with the external pressure data.

[0059] The external pressure data is used to simulate the water pressure at a specific water depth, and the internal pressure data is used to simulate the change in the pressure inside the cabin during the operation of the underwater equipment 1.

[0060] During the test of the underwater equipment pressure resistance condition of this embodiment, the external pressure data and the internal pressure data may have multiple combinations:

[0061] Scenario 1: When both the variable pressure cabin 11 and the normal pressure cabin 12 are at normal pressure, Figure 3 As shown, only pressure is applied to the underwater equipment 1 to simulate the pressure-resistant structure to bear the deep-sea pressure load, which is used to investigate and study the safety and reliability of the pressure-resistant structure;

[0062] Scenario 2: When pressure is applied both inside the pressure-changing chamber 11 and outside the underwater equipment 1, Figure 4 As shown, a test may be conducted on a single variable pressure cabin 11, such as simulating the internal / external pressure coupling load caused by the launch of a combat unit in a launch cabin of a pressure-resistant structure under a deep-sea pressure environment, which is used to investigate and study the structural safety and functionality of a single cabin of a special pressure-resistant structure, and is a single cabin internal / external pressure coupling working condition;

[0063] Scenario 3: When pressure is applied both inside the pressure-changing chamber 11 and outside the underwater equipment 1, Figure 5 As shown, when pressure is applied to both the variable pressure cabin 11 and the underwater equipment 1, multiple variable pressure cabins 11 can be tested to simulate the internal and external pressure coupling loads of the two launching cabins caused by the simultaneous launch of combat units of the double cabins (or multiple cabins) of the pressure-resistant structure in a deep-sea pressure environment. This is used to investigate and study the safety and functionality of the multi-cabin structure of the special pressure-resistant structure, and is a double cabin (or multiple cabin) internal and external pressure coupling working condition test.

[0064] Embodiment 2:

[0065] In view of the pressure change control in the pressure-changing chamber 11 in the complex underwater equipment 1, this embodiment, based on the first embodiment, divides the second pressure-adding and pressure-relief system into multiple pressure-adding and pressure-relief pipelines connected to multiple pressure-changing chambers 11 respectively, so as to realize the dynamic change of the pressure in each pressure-changing chamber 11 of the underwater equipment 1 in the pressure cylinder 2. The second pressure-adding and pressure-relief system of this embodiment includes an accumulator 7, an adapter 4 and a second liquid storage tank 6 located outside the pressure cylinder 2. The liquid pressure in the accumulator 7 is the liquid supply pressure. The number of adapters 4 is consistent with the number of pressure-changing chambers 11 and corresponds one to one.

[0066] A liquid storage chamber 401 is provided in the adapter 4, and the liquid storage chamber 401 is connected to the corresponding transformer cabin 11, and the liquid storage chamber 401 of each adapter 4 is connected to the accumulator 7. The internal pressure data includes a pressure demand value of each transformer cabin 11, and the liquid supply pressure is greater than or equal to the pressure demand value. A sensor 45 for detecting the pressure in the liquid storage chamber 401 is installed on the adapter 4. The sensor 45 is connected to the control system 5 signal. The pressure demand value is a pressure value or a range value. The sensor 45 is connected to the control system 5 via a signal line 44.

[0067] like Figure 1 As shown, the liquid storage chamber 401 of the adapter 4 is connected to a pressure-changing chamber 11 through a connecting pipe 41 , and the middle part of the connecting pipe 41 is watertightly connected to the pressure cylinder 2 .

[0068] The accumulator 7 is a commercially available product, including a liquid storage tank and a boosting mechanism. The boosting mechanism is used to maintain the liquid pressure in the liquid storage tank to meet the liquid supply pressure requirement. The boosting method of the boosting mechanism is similar to that of the pressure cylinder 2. Specifically, the accumulator 7 is a bladder accumulator, and a bladder is provided in the liquid storage tank for stabilizing the pressure.

[0069] The test method for the underwater equipment pressure resistance condition of this embodiment includes the following steps:

[0070] The underwater equipment 1 is placed in the pressure cylinder 2, the pressure cylinder 2 is connected to the first pressure-adding and pressure-relief system 3, and the pressure-changing chamber 11 is connected to the second pressure-adding and pressure-relief system outside the pressure cylinder 2, specifically connected to the corresponding liquid storage chamber 401 of the adapter 4;

[0071] The control system 5 obtains external pressure data and internal pressure data of the underwater equipment 1 under pressure-resistant working conditions, and the internal pressure data includes the pressure demand value of each variable pressure compartment 11;

[0072] The first pressure-adding and pressure-relief system 3 and the second pressure-adding and pressure-relief system are started. The first pressure-adding and pressure-relief system 3 controls the pressure in the pressure cylinder 2 according to the external pressure data. The control system 5 obtains the pressure signal from the sensor 45, and adjusts the amount of liquid in the accumulator 7 entering the liquid storage chamber 401 according to the pressure demand value of the variable pressure chamber 11, or adjusts the amount of liquid in the variable liquid storage chamber 401 entering the second liquid storage tank 6, thereby changing the pressure in the variable pressure chamber 11, so that the pressure-resistant structure of the underwater equipment 1 is in the target stress state;

[0073] Under the target stress state, the bearing capacity of the target position on the pressure-resistant structure is verified.

[0074] like Figure 2 As shown, the structure of the adapter 4 includes a pressure-resistant cylinder 403, a liquid storage chamber 401 is located inside the pressure-resistant cylinder 403, and the pressure-resistant cylinder 403 is provided with a first instrument interface 402 connected to the liquid storage chamber 401, a second instrument interface 408, a liquid discharge port 404, a pressure inlet port 405, a connecting port 406 and a pressure outlet port 407.

[0075] Among them, the first instrument interface 402 is used to install the sensor 45, and the second instrument interface 408 is used to install a pressure gauge; the connecting pipeline 41 connects the pressure outlet 407 with the corresponding transformer cabin 11, which is used to keep the pressure in the liquid storage chamber 401 consistent with that in the corresponding transformer cabin 11; the boost pipeline 42 connects the pressure inlet 405 and the accumulator 7, which is used to pressurize the liquid storage chamber 401, thereby changing the pressure in the transformer cabin 11; the pressure relief pipeline 43 connects the drain port 404 with the second liquid storage tank 6, which is used to discharge the liquid in the liquid storage chamber 401 to the second liquid storage tank 6, thereby changing the pressure in the transformer cabin 11.

[0076] A plurality of pressure transmission interfaces are provided on the adapter 4, which can flexibly realize complex test conditions and pressure detection and control. When there are two adapters 4, the communication ports 406 of the two adapters 4 can also be connected through a connecting pipe 8, and a connecting valve 81 is provided on the connecting pipe 8. According to the actual pressure demand, if the pressure demands of the two pressure-changing chambers 11 are the same, the connecting valve 81 can be opened to connect the liquid storage chambers 401 of the two adapters 4, such as Figure 6 shown.

[0077] In the above structure, the pressurizing unit of the second pressurizing and releasing system includes multiple pressurizing pipelines 42 and accumulators 7, the pressure relief unit of the second pressurizing and releasing system includes multiple pressure relief pipelines 43 and a second liquid storage tank 6, and the connecting unit of the second pressurizing and releasing system includes multiple adapters 4 and multiple connecting pipelines 41.

[0078] The test method for the pressure-resistant working condition of the underwater equipment of the present embodiment connects the liquid storage chamber 401 located in the adapter 4 with the pressure transformer chamber 11, connects the pressure transformer chamber 11 with the pressurizing unit and the pressure relief unit through the adapter 4, and detects and controls the pressure of the liquid in the liquid storage chamber 401, thereby indirectly detecting and controlling the pressure of the pressure transformer chamber 11, thereby realizing independent control of the pressure in multiple pressure transformer chambers 11, realizing the adjustment and testing of various pressure-resistant working conditions, and conducting a comprehensive verification of the bearing capacity of the pressure-resistant structure.

[0079] like Figure 1 As shown, the accumulator 7 is connected to the liquid storage chamber 401 through a boosting pipeline 42, and a first valve 421 is provided on the boosting pipeline 42; the liquid storage chamber 401 is connected to the second liquid storage tank 6 through a pressure relief pipeline 43, and a second valve 431 is provided on the pressure relief pipeline 43. The first valve 421 and the second valve 431 are both regulating valves and are electrically connected to the control system 5;

[0080] By adjusting the opening and closing of the first valve 421, the amount of liquid in the accumulator 7 entering the pressure-changing chamber 11 is adjusted;

[0081] By adjusting the opening and closing of the second valve 431 , the amount of liquid in the pressure changing chamber 11 entering the second liquid storage tank 6 is adjusted.

[0082] The opening and closing of the valve includes the degree of opening, fully closed and fully open, and the amount of liquid entering includes the total amount and the rate of change. The pressure state of the variable pressure chamber 11 is changed by adjusting the amount of liquid entering, which is used to simulate the actual working conditions of the underwater equipment 1, such as the instantaneous pressure change in the launch cabin caused by the launch of the projectile or the internal pressure change caused by the change in the water volume in the ballast tank.

[0083] The pressure-resistant working condition includes the projectile launching working condition, and the variable pressure cabin 11 includes the launching cabin.

[0084] The pressure-resistant working condition includes the gravity-adjusting working condition of the underwater equipment 1, and the variable pressure compartment 11 includes a ballast tank.

[0085] The second pressure-adding and pressure-relieving system of this embodiment realizes the independent regulation of the pressure of each variable pressure compartment 11, and can also realize the dynamic simulation of pressure change:

[0086] The pressure demand value includes the pressure change speed, the upper pressure limit and the lower pressure limit in the variable pressure chamber 11, and the lower pressure limit is normal pressure;

[0087] Under the target stress state, the pressure in the variable pressure chamber 11 fluctuates, and the bearing capacity of the target position on the pressure-resistant structure is verified during the pressure fluctuation.

[0088] The pressure fluctuation process in the variable pressure chamber 11 simulates the change process of the ballast water volume or the pressure change in the launch chamber during the launch of the missile.

[0089] The second pressure relief system of this embodiment realizes the independent regulation of the pressure of each variable pressure compartment 11, and at the same time, the liquid can realize the static simulation of pressure change:

[0090] The pressure requirement value includes the upper limit of the pressure in the pressure-changing chamber 11;

[0091] Under the target stress state, when the internal pressure of the pressure-transformer cabin 11 reaches the upper pressure limit, the load-bearing capacity of the target position on the pressure-resistant structure is verified.

[0092] The upper limit of the pressure in the variable pressure chamber 11 is the maximum value of the pressure in the launching chamber during the process of changing the ballast water volume or launching the missile.

[0093] In this embodiment, the number of the pressure-changing chambers 11 is greater than or equal to two, and the target position includes the junction between the pressure-changing chamber 11 and the normal pressure chamber 12, and the junction between adjacent pressure-changing chambers 11. Comprehensive monitoring of the stress state of the underwater equipment is achieved.

[0094] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A test method for underwater equipment under pressure conditions, characterized in that: The underwater equipment (1) is provided with a variable pressure chamber (11) and a normal pressure chamber (12), and the test method comprises the following steps: The underwater equipment (1) is placed in a pressure cylinder (2), the pressure cylinder (2) is connected to a first pressure-adding and pressure-relief system (3), and the variable pressure chamber (11) is connected to a second pressure-adding and pressure-relief system located outside the pressure cylinder (2); The control system (5) obtains external pressure data and internal pressure data of the underwater equipment (1) under the pressure-resistant working condition; Starting the first pressure-adding and pressure-relief system (3) and the second pressure-adding and pressure-relief system, wherein the first pressure-adding and pressure-relief system (3) controls the pressure in the pressure cylinder (2) according to the external pressure data, and the second pressure-adding and pressure-relief system controls the pressure in the variable pressure chamber (11) according to the internal pressure data, so that the pressure-resistant structure of the underwater equipment (1) is in a target stress state; Under the target stress state, the load-bearing capacity of the target position on the pressure-resistant structure is verified.

2. The test method for underwater equipment pressure resistance conditions according to claim 1, characterized in that: The external pressure data is used to simulate the water pressure at a specific water depth, and the internal pressure data is used to simulate the change in the pressure inside the cabin during the operation of the underwater equipment (1).

3. The test method for underwater equipment pressure resistance conditions according to claim 1, characterized in that: The second pressure-adding and pressure-releasing system comprises an accumulator (7), an adapter (4) and a second liquid storage tank (6) located outside the pressure cylinder (2); the liquid pressure in the accumulator (7) is the liquid supply pressure; the number of the adapters (4) is consistent with the number of the pressure-changing chambers (11) and corresponds one to one; The adapter (4) is provided with a liquid storage cavity (401), the liquid storage cavity (401) is in communication with a corresponding variable pressure chamber (11), the internal pressure data includes a pressure requirement value of each variable pressure chamber (11), the liquid supply pressure is greater than or equal to the pressure requirement value, and the adapter (4) is provided with a sensor (45) for detecting the pressure in the liquid storage cavity (401); The second pressure-adding and pressure-relieving system controls the pressure in the variable pressure chamber (11) according to the internal pressure data, comprising the following steps: The control system (5) obtains the pressure signal from the sensor (45), and adjusts the amount of liquid in the accumulator (7) entering the liquid storage chamber (401) according to the pressure demand value of the variable pressure chamber (11), or adjusts the amount of liquid in the liquid storage chamber (401) entering the second liquid storage tank (6).

4. The test method for underwater equipment pressure resistance conditions according to claim 3, characterized in that: The accumulator (7) is connected to the liquid storage chamber (401) via a pressure boosting pipeline (42), and a first valve (421) is provided on the pressure boosting pipeline (42); the liquid storage chamber (401) is connected to the second liquid storage tank (6) via a pressure relief pipeline (43), and a second valve (431) is provided on the pressure relief pipeline (43); the first valve (421) and the second valve (431) are both regulating valves and are electrically connected to the control system (5); By adjusting the opening and closing of the first valve (421), the amount of liquid in the accumulator (7) entering the pressure-changing chamber (11) is adjusted; By adjusting the opening and closing of the second valve (431), the amount of liquid in the pressure-changing chamber (11) entering the second liquid storage tank (6) is adjusted.

5. The test method for underwater equipment pressure resistance conditions according to claim 1, characterized in that: The pressure demand value includes the pressure change speed, the upper pressure limit and the lower pressure limit in the variable pressure chamber (11), wherein the lower pressure limit is normal pressure; Under the target stress state, the pressure in the variable pressure chamber (11) fluctuates, and during the pressure fluctuation, the load-bearing capacity of the target position on the pressure-resistant structure is verified.

6. The test method for underwater equipment pressure resistance conditions according to claim 1, characterized in that: The pressure requirement value includes the upper limit of the pressure in the variable pressure chamber (11); Under the target stress state, when the internal pressure of the variable pressure chamber (11) reaches the upper pressure limit, the load-bearing capacity of the target position on the pressure-resistant structure is verified.

7. The test method for underwater equipment pressure resistance conditions according to claim 1, characterized in that: The number of the variable pressure cabins (11) is greater than or equal to two, and the target position includes the junction position of the variable pressure cabin (11) and the normal pressure cabin (12), and the junction position of adjacent variable pressure cabins (11).

8. The test method for underwater equipment pressure resistance conditions according to claim 1, characterized in that: The pressure-resistant working condition includes a projectile launching working condition, and the variable-pressure cabin (11) includes a launching cabin.

9. The test method for underwater equipment pressure resistance conditions according to claim 1, characterized in that: The pressure-resistant working condition includes a gravity adjustment working condition of the underwater equipment (1), and the variable pressure cabin (11) includes a ballast tank.

10. The test method for underwater equipment pressure resistance conditions according to claim 1, characterized in that: The first pressure-increasing and pressure-relieving system (3) comprises a high-pressure pump group and a first liquid storage tank, wherein the water outlet of the high-pressure pump group is connected to the pressure cylinder (2), and the water inlet of the high-pressure pump group is connected to the first liquid storage tank. The pressure cylinder (2) is also provided with a discharge pipeline, and the discharge pipeline is connected to the first liquid storage tank.

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