Underwater vehicle heavy object falling impact vibration noise test device and test method

Abstract

The invention provides an underwater vehicle heavy object falling impact vibration noise test device and a test method. The underwater vehicle heavy object falling impact vibration noise test device comprises a to-be-tested underwater vehicle, a data acquisition and analysis system, an attitude measurement system and a heavy object falling system, the data acquisition and analysis system comprises a group of hydrophones and acceleration sensors, the hydrophones and the acceleration sensors are connected with a data acquisition instrument, and the data acquisition instrument is connected with a computer; the attitude measurement system comprises an attitude sensor and an echo sounder; the heavy object falling system comprises a controller, the controller is connected with a motor, the motor is connected with a smooth rope, the smooth rope bypasses a pulley and is connected with an electromagnet, and the electromagnet is electrified to generate electromagnetic force to attract a heavy object. The device can measure and analyze the impact on the underwater vehicle when the heavy object falls by combining the tested vibration and noise signals, is used for evaluating the vibration response and sound radiation characteristics of the underwater vehicle, and is widely applied to the field of vibration and noise reduction design and noise control research of the underwater vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater vehicle vibration and noise testing, and particularly relates to an underwater vehicle heavy object drop impact vibration and noise test device and a testing method. Background Art

[0002] In the field of ocean engineering, as a key device for performing underwater detection, monitoring, and operation tasks, the performance stability and reliability of underwater vehicles are crucial. However, in practical applications, underwater vehicles may be subjected to various external impact loads, among which the heavy object drop impact load is a common and non-negligible influencing factor. Such impact loads may cause abnormal vibrations and noises in underwater vehicles, thereby affecting their stealth, navigation accuracy, and operation efficiency. In severe cases, it may even damage their structural integrity. Therefore, studying the relevant characteristics of underwater vehicles under heavy object drops is crucial for the vibration reduction and noise reduction design of underwater vehicles.

[0003] In summary, the present invention aims to overcome the inability to test the vibration and noise of underwater vehicles under heavy object drop impact loads in the prior art, and provides a more accurate and reliable test device and testing method to meet the urgent needs of the ocean engineering field for the performance evaluation of underwater vehicles. Summary of the Invention

[0004] The purpose of the present invention is to provide an underwater vehicle heavy object drop impact vibration and noise test device and a testing method, which can achieve the impact on the underwater vehicle under heavy object drops, and measure and analyze the combined vibration and noise signals for testing, so as to evaluate the vibration response and sound radiation characteristics of the underwater vehicle.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] An underwater vehicle heavy object drop impact vibration and noise test device includes: an underwater vehicle to be tested, a data acquisition and analysis system, an attitude measurement system, and a heavy object drop system;

[0007] The data acquisition and analysis system includes a group of hydrophones and acceleration sensors. The hydrophones and the acceleration sensors are respectively connected to a data acquisition instrument, and the data acquisition instrument is connected to a computer;

[0008] The attitude measurement system includes an attitude sensor and an echo sounder;

[0009] The heavy object drop system includes a controller, the controller is connected to a motor, the motor is connected by a smooth rope, the smooth rope bypasses a pulley and is connected to an electromagnet, the electromagnet generates an electromagnetic force to adsorb a heavy object, and the controller is connected to the computer.

[0010] Further, the attitude sensor is installed on the internal platform deck of the underwater vehicle to check and adjust the attitude of the underwater vehicle to be horizontal, and transmit the collected data to the computer through a data connection line.

[0011] Further, the echo sounder is installed at the bottom of the underwater vehicle to detect the underwater vehicle diving to a specified water depth, and transmit the collected data to the computer through a data connection line.

[0012] Further, the electromagnet is connected to the motor through a cable. After the controller issues an instruction, the electromagnet loses its magnetic force by power-off, and the heavy object falls, forming a falling impact load.

[0013] Further, one of the acceleration sensors is arranged near the falling position of the heavy object to collect the impact acceleration generated by the falling of the heavy object, and the remaining acceleration sensors are evenly arranged on the inner shell and the platform deck of the underwater vehicle according to the working conditions.

[0014] Further, the hydrophones are arranged at equal distances along the length direction of the underwater vehicle to collect the radiated noise data of the underwater vehicle and transmit the data to the computer.

[0015] The present invention may further include:

[0016] A method for testing the impact vibration and noise of a heavy object falling on an underwater vehicle, the testing method using the above test device, the method comprising the following steps:

[0017] Step 1: In the test stage, the underwater vehicle to be tested is hoisted by a gantry crane. For precise control, the data collected by the attitude sensor in the attitude measurement system will be used to monitor and calibrate the attitude of the underwater vehicle to ensure that it maintains a horizontal state, and the data collected by the echo sounder will be used to ensure that the underwater vehicle accurately dives to the specified established water depth;

[0018] Step 2: Place the hydrophones and acceleration sensors at the specified positions according to the test requirements, connect the hydrophones and acceleration sensors to the data acquisition system, and check whether the signals of each channel are normal;

[0019] Step 3: After meeting the requirements, start the test. Adjust the heavy object to directly above the specified falling point. After the system is ready, the computer issues a falling instruction. The electromagnet loses its magnetic force by power-off. 10 s after the heavy object falls to the falling point, the motor operates to lift the heavy object to the falling height. The electromagnet is energized to generate magnetic force to keep the heavy object adsorbed in a state of waiting to fall. Then the motor reverses to release the smooth rope, and the released length is the length to ensure that the heavy object can complete free fall;

[0020] Step 4: The acceleration sensor collects vibration acceleration data, and the hydrophone collects radiated noise data, and feeds the vibration and noise data back to the computer for storage and analysis of the data;

[0021] Step 5: Conduct corresponding heavy object drop tests for different working conditions, adjust the drop height and the position of the drop point, and repeat Step S-4;

[0022] Step 6: After all specified test contents are completed, use the gantry crane to recover the underwater vehicle from the test environment. Subsequently, disassemble and recover all relevant equipment to complete the whole process of the impact vibration and noise test of the underwater vehicle under the heavy object drop, and complete the analysis of the impact vibration and noise characteristics of the underwater vehicle under the heavy object drop through data processing.

[0023] Furthermore, the heavy object drop system realizes the cyclic collection and release of the heavy object. The specific operation method includes:

[0024] First, connect the motor, electromagnet, heavy object, smooth rope and controller, and conduct a comprehensive joint adjustment to ensure that all components can work normally. After the controller sends a drop command, there is no magnetic connection between the electromagnet and the heavy object, and the heavy object freely falls to the set drop point. After the heavy object falls, the system will wait for 10 seconds to ensure that the data is transmitted to the computer for storage and analysis. Subsequently, the motor runs to lift the heavy object to the drop height, the electromagnet is energized to generate magnetic force to keep the heavy object adsorbed and waiting to fall, and then the motor reverses to release the smooth rope, and the released length is the length to ensure that the heavy object completes free fall. This process will be repeated continuously to realize the cyclic fall of the heavy object.

[0025] The beneficial effects of the present invention are as follows:

[0026] The linkage control of the attitude measurement system and the echo sounder of the present invention ensures the attitude stability of the vehicle and the accuracy of the diving depth during the test, effectively eliminates environmental interference factors, and significantly improves the credibility of the test data; the heavy object drop system based on the power-off release of the electromagnet and the cyclic collection and release of the motor realizes the standardized generation of impact loads through programmed control, and solves the technical problem of non-reproducible loads in traditional impact tests; through the closed-loop control of the controller and the computer, the full-process automation operation of drop - collection - recovery - re-triggering is realized, and it has the ability of continuous cyclic testing, which is especially suitable for long-term reliability verification; the modular design allows flexible adjustment of the sensor layout scheme and the parameters of the drop system to adapt to the test requirements of different types of vehicles. Description of the Drawings

[0027] Att Figure 1 The flow schematic diagram of the test method of the present invention.

[0028] Att Figure 2 The structural schematic diagram of the test device of the present invention.

[0029] Appendix Figure 3 Schematic diagram of the internal system of the test device of the present invention.

[0030] Appendix Figure 4 Schematic diagram of the structure of the heavy object falling system of the present invention.

[0031] In the attached drawings: 1, underwater vehicle; 2, computer; 3, data acquisition instrument; 4, controller; 5, motor; 6, heavy object; 7, electromagnet; 8, attitude sensor; 9, echo sounder; 10, pulley; 11, smooth rope; 12, platform deck; 13, hydrophone; 14, acceleration sensor. Detailed implementation manners

[0032] The present invention will be further described below with reference to the attached drawings.

[0033] The present invention provides a test device for impact vibration noise caused by the fall of a heavy object on an underwater vehicle. As shown in the appendix Figure 2-4 it includes: an underwater vehicle 1 to be tested, a data acquisition and analysis system, an attitude measurement system, and a heavy object falling system;

[0034] The data acquisition and analysis system includes a group of hydrophones 13 and acceleration sensors 14. The hydrophones 13 and the acceleration sensors 14 are respectively connected to a data acquisition instrument 3, and the data acquisition instrument 3 is connected to a computer 2;

[0035] The attitude measurement system includes an attitude sensor 8 and an echo sounder 9;

[0036] The heavy object falling system includes a controller 4. The controller 4 is connected to a motor 5. The motor 5 is connected to a smooth rope 11. The smooth rope 11 bypasses a pulley and is connected to an electromagnet. The electromagnetic force generated by the energized electromagnet adsorbs a heavy object 6. The controller 4 is connected to the computer 2.

[0037] Specifically, the attitude sensor 8 is installed on the internal platform deck 12 of the underwater vehicle 1, used to check and adjust the attitude of the underwater vehicle 1 to be horizontal, and transmit the collected data to the computer 2 through a data connection line.

[0038] In this embodiment, the attitude sensor 8 is installed by means of a magnetic base. First, use a grinder to polish the paint at the measured point on the platform to ensure that the installation surface is clean, free of oil stains or impurities, so as to ensure the best magnetic adsorption effect. Adsorb the magnetic base on the installation surface, and pay attention to avoiding the impact of metal on metal, which may cause sensor overload and damage. According to the interface type of the sensor, correctly connect the cable to the sensor, confirm that the sensor is firmly installed, the cable connection is reliable, and there is no looseness or damage. After the sensor is installed, carry out necessary testing and calibration work to ensure that the sensor can accurately measure and output attitude data; before installing the echo sounder 9, verify the integrity of all accessories, including the echo sounder, waterproof cable, data cable, etc., and ensure that they are all in good condition. Select a flat and obstacle-free installation area at the bow bottom of the underwater vehicle 1 to ensure the accuracy of the measurement data. Fix the echo sounder on the bottom center line, and at the same time carefully check the integrity of the waterproof seal to prevent water intrusion from damaging the equipment.

[0039] After the attitude sensor 8 and the echo sounder 9 are both installed, accurately connect the cables to the internal power system of the vehicle, and the data ends need to be connected to the corresponding interfaces of the data acquisition instrument 3. After all the installation work is completed, turn on the attitude sensor 8 and the echo sounder 9, and conduct a comprehensive inspection of the working state of the sensors to confirm that they can operate normally, accurately receive and display attitude and water depth data.

[0040] Specifically, the echo sounder 9 is installed at the bottom of the underwater vehicle 1, and is used to detect that the underwater vehicle 1 dives to a specified water depth, and transmits the collected data to the computer 2 through a data connection cable.

[0041] Specifically, one of the acceleration sensors 14 is arranged near the position where the heavy object falls, and is used to collect the impact acceleration generated by the falling of the heavy object. The remaining acceleration sensors 14 are evenly arranged on the inner shell of the underwater vehicle 1 and the platform deck 12 according to the working conditions.

[0042] Specifically, the hydrophones 13 are arranged at equal distances along the length direction of the underwater vehicle 1, and are used to collect the radiated noise data of the underwater vehicle 1 and transmit the data to the computer 2. The distance between the hydrophone 13 and the geometric center position of the underwater vehicle 1 is determined according to the actual working conditions.

[0043] In this embodiment, the electromagnet 7 is connected to the motor 5 through a cable. When the controller 4 issues an instruction, the electromagnet 7 loses its magnetic force by power-off, and the heavy object 6 falls, forming a falling impact load.

[0044] The heavy object dropping system of the present invention can simulate the actual impact that a heavy object dropping may cause to the underwater vehicle 1, and at the same time provides the necessary impact load conditions for the vibration and noise test, thereby solving the problems of heavy object dropping and cyclic dropping impact vibration and noise testing.

[0045] The distance between the hydrophone 13 and the geometric center position of the underwater vehicle 1 is determined according to the actual working conditions.

[0046] This embodiment further includes:

[0047] A method for testing the impact vibration and noise of a heavy object dropping on an underwater vehicle, the testing method adopts the test device described in any one of claims 1-7, as shown in the appendix Figure 1 shown, and this method includes the following steps:

[0048] Step 1: In the test stage, the underwater vehicle 1 to be tested is hoisted by a gantry crane. For precise regulation, the data collected by the attitude sensor 8 in the attitude measurement system will be used simultaneously to monitor and calibrate the attitude of the underwater vehicle 1 to ensure that it maintains a horizontal state, and the data collected by the echo sounder 9 is used to ensure that the underwater vehicle 1 accurately dives to the specified established water depth;

[0049] Step 2: Place the hydrophone 13 and the acceleration sensor 14 at the specified positions according to the test requirements, connect the hydrophone 13 and the acceleration sensor 14 to the data acquisition system, and check whether the signals of each channel are normal;

[0050] Step 3: After meeting the requirements, start the test. Adjust the heavy object 6 to directly above the specified dropping point. After the system is ready, the computer issues a dropping command. By cutting off the power, the magnetic force of the electromagnet 7 disappears. After the heavy object 6 drops to the dropping point for 10 s, the motor 5 operates to lift the heavy object 6 to the dropping height. The electromagnet 7 is energized to generate magnetic force to keep the heavy object 6 in an adsorbed state waiting to drop. Subsequently, the motor 5 rotates in reverse to release the smooth rope 11, and the released length is the length that ensures the heavy object 6 can complete free fall;

[0051] Step 4: The acceleration sensor 14 collects vibration acceleration data, the hydrophone 13 collects radiated noise data, and feeds the vibration and noise data back to the computer 2 for data storage and analysis;

[0052] Step 5: Conduct corresponding heavy object dropping tests for different working conditions, adjust the dropping height and the position of the dropping point, and repeat steps 2-4;

[0053] Step 6: After all the specified test contents are completed, use the gantry crane to recover the underwater vehicle 1 from the test environment. Subsequently, disassemble and recover all relevant equipment to complete the whole process of testing the impact vibration and noise of the heavy object dropping on the underwater vehicle 1, and complete the analysis of the impact vibration and noise characteristics of the heavy object dropping on the underwater vehicle through data processing.

[0054] Further, the heavy object falling system realizes the cyclic winding and unwinding of the heavy object 6, and the specific operation method includes:

[0055] First, connect the motor 5, the electromagnet 7, the heavy object 6, the smooth rope 11 and the controller 4, and conduct a comprehensive joint debugging to ensure that all components can work normally. After the controller 4 sends a falling instruction, there is no magnetic connection between the electromagnet 7 and the heavy object 6, and the heavy object 6 freely falls to the set falling point. After the heavy object 6 falls, the system will wait for 10 seconds to ensure that the data is transmitted to the computer 2 for storage and analysis. Subsequently, the motor 5 operates to lift the heavy object 6 to the falling height, the electromagnet 7 is energized to generate magnetic force, so that the heavy object 6 remains adsorbed and waiting to fall. Subsequently, the motor 5 reversely rotates to release the smooth rope 11, and the released length is the length to ensure that the heavy object 6 completes free fall. This process will be repeated continuously, so as to realize the cyclic falling of the heavy object 6.

[0056] Combined with the attached Figure 1-4 As shown in the figure, this embodiment proposes a method for testing the impact vibration and noise of an underwater vehicle under the fall of a heavy object. This method accurately measures the vibration and sound radiation data of the underwater vehicle 1 by synchronously using the acceleration sensor 14 and the hydrophone 13; the heavy object falling system is fixed to the inner shell of the underwater vehicle 1 through a bracket. The motor 5 and the electromagnet 7 are connected by a smooth rope 11, and the heavy object 6 is adsorbed on the electromagnet 7 by electromagnetic force. When the controller 4 receives a preset instruction, the magnetic force of the electromagnet 7 disappears by power-off, and the heavy object 6 falls, forming a falling impact load. Subsequently, the motor 5 operates to lift the heavy object 6 to the falling height, the electromagnet 7 is energized to generate magnetic force, so that the heavy object 6 remains adsorbed and waiting to fall, realizing the cyclic winding and unwinding of the heavy object 6, simulating the actual impact scenario, and measuring through the acceleration sensor arranged near the specified falling point, so as to monitor the magnitude of the impact load in real time, so as to ensure that the test conditions are close to the actual working conditions, thus comprehensively ensuring the accuracy and reliability of the test results.

[0057] The present invention can realize the impact on the underwater vehicle under the fall of a heavy object, and perform measurement and analysis in combination with the measured vibration and noise signals, so as to evaluate the vibration response and sound radiation characteristics of the underwater vehicle.

[0058] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An underwater vehicle heavy object drop impact vibration and noise test device, characterized in that, Including: an underwater vehicle (1) to be measured, a data acquisition and analysis system, an attitude measurement system, and a heavy object dropping system; the data acquisition and analysis system includes a set of hydrophones (13) and acceleration sensors (14), the hydrophones (13) and the acceleration sensors (14) are respectively connected to a data collector (3), and the data collector (3) is connected to a computer (2); the attitude measurement system includes an attitude sensor (8) and an echo sounder (9); the heavy object dropping system includes a controller (4), the controller (4) is connected to a motor (5), the motor (5) is connected to a smooth rope (11), the smooth rope (11) bypasses a pulley and is connected to an electromagnet, the electromagnetic force generated by the energized electromagnet adsorbs a heavy object (6), and the controller (4) is connected to the computer (2).

2. The underwater vehicle heavy object drop impact vibration and noise test device according to claim 1, characterized in that, The attitude sensor (8) is installed on the internal platform deck (12) of the underwater vehicle (1) to check and adjust the attitude of the underwater vehicle (1) to be horizontal, and transmits the collected data to the computer (2) through a data connection line.

3. The underwater vehicle heavy object drop impact vibration and noise test device according to claim 1, characterized in that, The echo sounder (9) is installed at the bottom of the underwater vehicle (1) to detect that the underwater vehicle (1) dives to a specified water depth, and transmits the collected data to the computer (2) through a data connection line.

4. The underwater vehicle heavy object drop impact vibration and noise test device according to claim 2 or 3, characterized in that The electromagnet (7) is connected to the motor (5) through a cable. When the controller (4) issues an instruction, the magnetic force of the electromagnet (7) disappears by power-off, and the heavy object (6) falls, forming a dropping impact load.

5. The underwater vehicle heavy object falling impact vibration and noise test device according to claim 4, characterized in that, One of the acceleration sensors (14) is arranged near the position where the heavy object drops to collect the impact acceleration generated by the dropping of the heavy object, and the remaining acceleration sensors (14) are evenly arranged on the internal shell and the platform deck (12) of the underwater vehicle (1) according to the working conditions.

6. The underwater vehicle heavy object drop impact vibration noise test device according to claim 5, characterized in that, The hydrophones (13) are arranged at equal distances along the length direction of the underwater vehicle (1) to collect the radiated noise data of the underwater vehicle (1) and transmit the data to the computer (2).

7. A test method for impact vibration noise of a heavy object falling on an underwater vehicle, characterized in that, The test method uses the test device according to any one of claims 1-6, and the method includes the following steps: Step 1: In the test stage, the underwater vehicle (1) to be measured is hoisted by a gantry crane. For precise control, the data collected by the attitude sensor (8) in the attitude measurement system will be used simultaneously to monitor and calibrate the attitude of the underwater vehicle (1) to ensure that it maintains a horizontal state, and the data collected by the echo sounder (9) is used to ensure that the underwater vehicle (1) dives precisely to the specified established water depth; Step 2: Place the hydrophones (13) and acceleration sensors (14) at the specified positions according to the test requirements, connect the hydrophones (13) and acceleration sensors (14) to the data acquisition system, and check whether the signals of each channel are normal; Step 3: After meeting the requirements, start the test. Adjust the heavy object (6) to directly above the designated drop point. After the system is ready, the computer issues a drop command. By cutting off the power, the magnetic force of the electromagnet (7) of the heavy object dropping system disappears. 10 seconds after the heavy object (6) drops to the drop point, the motor (5) operates to lift the heavy object (6) to the dropping height. The electromagnet (7) is energized to generate magnetic force to keep the heavy object (6) in an adsorbed state waiting to drop. Then the motor (5) rotates in reverse to release the smooth rope (11), and the released length is such that the heavy object (6) can complete free fall. Step 4: The acceleration sensor (14) collects vibration acceleration data, and the hydrophone (13) collects radiation noise data, and feeds the vibration and noise data back to the computer (2) for data storage and analysis. Step 5: Conduct corresponding heavy object drop tests for different working conditions, adjust the dropping height and the position of the drop point, and repeat Steps 2 - 4. Step 6: After all the designated test contents are completed, use the gantry crane to recover the underwater vehicle (1) from the test environment. Subsequently, disassemble and recover all relevant equipment to complete the whole process of the impact vibration and noise test of the underwater vehicle (1) under the heavy object drop, and complete the analysis of the impact vibration and noise characteristics of the underwater vehicle under the heavy object drop through data processing.

8. The underwater vehicle heavy object drop impact vibration and noise test device according to claim 7, characterized in that The heavy object dropping system realizes the cyclic collection and release of the heavy object (6). The specific operation method includes: First, connect the motor (5), the electromagnet (7), the heavy object (6), the smooth rope (11) and the controller (4), and conduct a comprehensive joint adjustment to ensure that all components can work normally. After the controller (4) sends a drop command, there is no magnetic connection between the electromagnet (7) and the heavy object (6), and the heavy object (6) freely falls to the set drop point. After the heavy object (6) drops, the system will wait for 10 seconds to ensure that the data is transmitted to the computer (2) for storage and analysis. Then the motor (5) operates to lift the heavy object (6) to the dropping height. The electromagnet (7) is energized to generate magnetic force to keep the heavy object (6) in an adsorbed state waiting to drop. Then the motor (5) rotates in reverse to release the smooth rope (11), and the released length is such that the heavy object (6) can complete free fall. This process will be repeated continuously to achieve the cyclic dropping of the heavy object (6).

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