Pulsating load test device and test method for the hull area of ​​a multi-degree-of-freedom underwater vehicle

Abstract

The present invention provides a multi-degree-of-freedom underwater vehicle hull area pulsating load test device and test method, belonging to the field of marine ship testing technology. The problem that the existing device cannot realize the pulsating load test of the hull area of ​​the underwater vehicle is solved. It includes a circulating water tank, an underwater vehicle model, a fairing, a connecting rod, a supporting rod and a positioning iron block. The underwater vehicle model is arranged inside the circulating water tank and the head of the model faces the incoming flow direction of the circulating water tank. The underwater vehicle model is flipped so that the hull of the underwater vehicle model faces downward; the fairing is installed on the underwater vehicle model, and the hull is completely immersed in water. The immersion depth and pitch angle of the underwater vehicle model are adjusted by adjusting the position of the supporting rod passing through the circular hole on the connecting rod, and the flow angle of the underwater vehicle model is adjusted by changing the angle between the supporting rod and the side wall of the circulating water tank. The present invention can complete the pulsating pressure and vibration acceleration test of the hull area of ​​the underwater vehicle under different working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of ship and ocean engineering testing, and in particular relates to a pulsating load testing device and a testing method for the hull area of ​​a multi-degree-of-freedom underwater navigation body. Background Art

[0002] The vibration and flow-induced noise of underwater vehicles during submersion are of great significance to the study of their concealment and navigation safety. By measuring the pulsating pressure and vibration acceleration response of the underwater vehicle model through the pulsating load test, the formation and propagation law of its flow-induced noise can be analyzed, which is of guiding significance for reducing the flow-induced noise of underwater vehicles and improving their concealment and navigation safety. At the same time, conducting flow-induced tests on underwater vehicles can discover acoustic problems in ship structural design in advance, and provide a good experimental platform and simulation data reference for ship acoustic design.

[0003] Experimental testing plays an irreplaceable role in the fields of underwater navigation body ship type development, acoustic performance analysis, etc. Model testing can verify existing research results and more easily discover problems in the design. On the other hand, it can provide excellent data reference for subsequent simulation design. With the development of computational fluid dynamics (CFD), the simulation of pulsating loads of underwater navigation body models using CFD software has become an effective and low-cost method. The application of relevant simulation software can reproduce the test scene: pre-process the mesh of the fluid area, verify the mesh convergence, set the initial conditions that are consistent with the actual boundary conditions of the test, and perform numerical simulation calculations of pulsating loads. Experimental testing can verify with numerical simulation in both directions, check and correct simulation data, and then optimize the simulation calculation method to accurately find design defects.

[0004] The circulating water tank is a large-scale test equipment composed of an oscillation mechanism, a drive motor control system and a data acquisition system. The operator can send instructions to the drive motor through the flow rate control console to adjust the motor speed, thereby obtaining the required flow rate for flow stimulation testing and realizing the recycling of water in the tank. The circulating water tank has a series of advantages such as good flow rate control ability and large working section size, and is a commonly used equipment for underwater model testing. Therefore, the development and design of a pulsating load test device for underwater vehicle models based on a circulating water tank has broad practical application value. Through a literature search of the prior art, it is found that in recent years, there are few patent documents on the pulsating load test device for the underwater structure enclosure area in the circulating water tank. Therefore, it is necessary to design a multi-degree-of-freedom underwater vehicle enclosure area pulsating load test device to solve the above problems. Summary of the invention

[0005] In view of this, the present invention aims to propose a multi-degree-of-freedom underwater vehicle hull area pulsating load testing device to solve the problem that existing devices cannot realize pulsating load testing of underwater vehicle models.

[0006] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0007] A multi-degree-of-freedom underwater vehicle enclosure area pulsating load test device comprises a circulating water tank, an underwater vehicle model, a fairing, a connecting rod, a supporting rod and a positioning iron block, wherein the underwater vehicle model is arranged inside the circulating water tank and the head of the underwater vehicle model faces the incoming flow direction of the circulating water tank, and the underwater vehicle model is flipped so that the enclosure of the underwater vehicle model faces downward; the fairing is installed on the underwater vehicle model, and during the test, the fairing is exposed above the water surface, and the enclosure of the underwater vehicle model is completely immersed in water;

[0008] Two support rods are provided, the length of the support rods is greater than the width of the circulating water tank, the two support rods are arranged in parallel, two connecting rods are provided, a plurality of circular holes are evenly opened on each connecting rod, the end of each connecting rod is provided with a threaded section, one support rod passes through a circular hole on a connecting rod and then spans the side wall of the circulating water tank, and both ends of each support rod are positioned on the edge of the corresponding side wall of the circulating water tank through a positioning iron block, and the positioning iron block and the edge of the circulating water tank are clamped by a clamp; the center distance d between two adjacent circular holes on the connecting rod satisfies d=L·tanθ, where L is the distance between the two connecting rods, and θ is the minimum pitch angle required for the test;

[0009] Two connecting rod threaded holes are opened on the top of the underwater vehicle model, and the two connecting rod threaded holes on the underwater vehicle model are respectively connected to a threaded section of a connecting rod; a plurality of large sensor installation openings are opened on the top of the underwater vehicle model, a plurality of pressure sensor threaded holes are arranged on the outer surface of the underwater vehicle model, a plurality of acceleration sensor studs are arranged inside the underwater vehicle model, the pressure sensor and the acceleration sensor are placed inside the underwater vehicle model through the large sensor installation openings, the acceleration sensor is installed on the acceleration sensor studs, the pressure sensor is installed on the pressure sensor threaded holes, and the surface of the pressure sensor is flush with the surface of the underwater vehicle model, and the cables of each sensor pass through the fairing; a matching curved plate is arranged at each large sensor installation opening of the underwater vehicle model, and a rubber sealing gasket is arranged at the matching curved plate and the corresponding large sensor installation opening;

[0010] The immersion depth and pitch angle of the underwater vehicle model are adjusted by adjusting the position of the support rod passing through the circular hole on the connecting rod, and the flow angle of the underwater vehicle model is adjusted by changing the angle between the support rod and the side wall of the circulating water tank.

[0011] Furthermore, the positioning iron block is provided with a square slot and an arched slot, wherein the square slot passes through the front and rear end faces of the positioning iron block, and the arched slot passes through the left and right end faces of the positioning iron block, wherein the square slot of the fixed iron block is used to engage the side wall of the circulating water tank, and the arched slot is used to accommodate the support rod.

[0012] Furthermore, all pressure sensors and acceleration sensors are installed at designated locations in the hull area of ​​the underwater vehicle model.

[0013] Furthermore, the cross-sectional shape of the connecting rod is streamlined.

[0014] Furthermore, the number of threaded holes of the pressure sensor and studs of the acceleration sensor can be flexibly adjusted according to test requirements.

[0015] Furthermore, a plurality of connection holes are provided on the periphery of the large sensor installation opening, and a plurality of threaded holes are provided on the matching curved plate, and the matching curved plate is fixed to the corresponding large sensor installation opening by screws passing through the threaded holes and the corresponding connection holes.

[0016] Furthermore, the connecting rod is a hollow tube; the supporting rod is a hollow tube.

[0017] Furthermore, the fairing is streamlined, threaded holes are arranged on the fairing, the fairing is mounted on the underwater vehicle model by screws, and a sealing and waterproof rubber gasket is arranged between the fairing and the underwater vehicle model.

[0018] Furthermore, the clamp is a G-type woodworking clamp.

[0019] The testing method of the pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle specifically comprises the following steps:

[0020] (1) Sensor arrangement: Install the pressure sensor and acceleration sensor at the predetermined position of the hull area of ​​the underwater vehicle model through the threaded hole of the pressure sensor and the stud of the acceleration sensor, apply glue or wrap raw tape on the threaded hole of the pressure sensor for waterproofing, pass the sensor cable through the fairing, close the large opening for sensor installation with screws, and fix the fairing on the underwater vehicle model;

[0021] (2) Assembling the test device: Use the threaded section to fix the connecting rod to the underwater vehicle model. The circular hole on the connecting rod should face the side wall of the circulating water tank. The support rod passes through the circular hole of the connecting rod and spans the side wall of the circulating water tank. The positioning iron block spans the support rod and is placed on the edge of the side wall of the circulating water tank. Use a G-type woodworking clamp to clamp the positioning iron block and the edge of the circulating water tank. The connecting rod and the support rod are tied and fixed with ropes;

[0022] (3) Start the test: Use the circulating water tank flow rate control console to adjust the flow rate in the circulating water tank. After the flow rate stabilizes, use the data acquisition instrument and supporting test software to collect data on pulsating pressure and vibration acceleration;

[0023] (4) Adjusting the model position: To change the immersion depth of the underwater vehicle model, loosen the G-type woodworking clamp, change the position of the support rod passing through the circular hole on the connecting rod, and the front and rear support rods pass through the circular holes at the same height on the connecting rod at the same time; to change the pitch angle of the underwater vehicle model, loosen the G-type woodworking clamp, keep one support rod in place, and pass the other support rod through a different circular hole; to change the flow angle of the underwater vehicle model, change the angle between the support rod and the side wall of the circulating water tank;

[0024] (5) End the test: After repeating the above steps to complete the measurement task, use the circulating water tank flow rate control console to adjust the flow rate in the circulating water tank to 0, and turn off the flow rate control system after the water flow in the circulating water tank is still;

[0025] (6) Disassembling the test device: After the test is completed, loosen the G-type woodworking clamp, lift the support rod to take the underwater vehicle model out of the circulating water tank, take out the test sensor, and disassemble the parts of the test device.

[0026] Compared with the prior art, the invention provides the following beneficial effects of the pulsating load testing device and method for the hull area of ​​a multi-degree-of-freedom underwater vehicle:

[0027] (1) The device is designed for testing the pulsating loads on the hull area of ​​underwater vehicles. It reduces the impact of the model connecting rod and fairing on the flow field in the test area, can flexibly adjust the immersion depth, pitch angle and flow angle of the underwater vehicle, and measure the pulsating pressure and vibration acceleration of the test model at different flow velocities.

[0028] (2) The device mainly focuses on the pulsating load test of the underwater vehicle hull area. It can adjust the immersion depth, pitch angle and flow angle of the underwater vehicle model according to the test requirements, and provides an effective means for testing the pulsating load of the underwater vehicle structure in a circulating water tank.

[0029] (3) The present invention has a simple structure, is easy to maintain, has good adaptability, and has a wide range of applications, thereby reducing the difficulty of testing the pulsating load in the hull area of ​​an underwater vehicle.

[0030] (4) The present application provides a positioning iron block with a limiting function at the connection between the support rod and the circulating water tank to limit the displacement of the support rod in the forward and backward directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0032] Figure 1 A schematic diagram of the working state of the pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to an embodiment of the present invention;

[0033] Figure 2 An assembly diagram of a pulsating load test device for a multi-degree-of-freedom underwater vehicle hull region (excluding a circulating water tank) according to an embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of the underwater vehicle model;

[0035] Figure 4 This is a bottom view of the underwater vehicle model;

[0036] Figure 5 A schematic diagram of the structure of the connecting rod in the pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to an embodiment of the present invention;

[0037] Figure 6 It is a structural diagram of the matching curved plate;

[0038] Figure 7 It is a schematic diagram of the structure of the G-type woodworking clamp.

[0039] Description of reference numerals:

[0040] 1. Underwater vehicle model; 2. Fairing; 3. Connecting rod; 4. Support rod; 5. Positioning iron block; 6. Threaded hole for pressure sensor; 7. Large opening for sensor installation; 8. Threaded hole for connecting rod; 9. Acceleration sensor stud; 10. Circular hole; 11. Threaded section; 12. Matching curved plate; 13. Threaded hole; 14. Rubber sealing gasket; 15. G-type woodworking clamp; 16. Circulating water tank; 17. Shell. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0044] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] like Figure 1-Figure 7 As shown, a multi-degree-of-freedom underwater vehicle enclosure area pulsating load test device includes a circulating water tank 16, an underwater vehicle model 1, a fairing 2, a connecting rod 3, a supporting rod 4 and a positioning iron block 5, wherein the underwater vehicle model 1 is arranged inside the circulating water tank 16 and the head of the underwater vehicle model 1 faces the incoming flow direction of the circulating water tank 17, and the underwater vehicle model 1 is flipped so that the enclosure 17 of the underwater vehicle model 1 faces downward; the fairing 2 is installed on the underwater vehicle model 1, and during the test, the fairing 2 is exposed to the water surface to prevent the sensor test wire from being impacted by the water flow, and the enclosure 17 of the underwater vehicle model 1 is completely immersed in water;

[0046] Two support rods 4 are provided, and the length of the support rods 4 is greater than the width of the circulating water tank 17. The two support rods 4 are arranged in parallel. Two connecting rods 3 are provided, and a plurality of circular holes 10 are evenly provided on each connecting rod 3. The end of each connecting rod 3 is provided with a threaded section 11. After a support rod 4 passes through a circular hole 10 on a connecting rod 3, it spans the side wall of the circulating water tank 17, and both ends of each support rod 4 are positioned on the edge of the corresponding side wall of the circulating water tank 17 through a positioning iron block 5, and the positioning iron block 5 and the edge of the circulating water tank 17 are clamped by a clamp; the clamp is a G-type woodworking clamp 15; the center distance d of two adjacent circular holes 10 on the connecting rod 3 satisfies d=L·tanθ, where L is the distance between the two connecting rods 3, and θ is the minimum pitch angle required for the test;

[0047] Two connecting rod threaded holes 8 are provided on the top of the underwater vehicle model 1, and the two connecting rod threaded holes 8 on the underwater vehicle model 1 are respectively connected to a threaded section 11 of a connecting rod 3; a plurality of large sensor installation openings 7 are provided on the top of the underwater vehicle model 1, a plurality of pressure sensor threaded holes 6 are provided on the outer surface of the underwater vehicle model 1, a plurality of acceleration sensor studs 9 are provided inside the underwater vehicle model 1, the pressure sensor and the acceleration sensor are placed inside the underwater vehicle model 1 through the large sensor installation openings 7, the acceleration sensor is installed on the acceleration sensor studs 9, the pressure sensor is installed on the pressure sensor threaded holes 6, and the surface of the pressure sensor is flush with the surface of the underwater vehicle model 1, and all the pressure sensors and acceleration sensors are installed at the designated positions of the enclosure area of ​​the underwater vehicle model 1; the cables of each sensor pass through the fairing 2; a matching curved plate 12 is provided at each large sensor installation opening of the underwater vehicle model 1, and a rubber sealing pad 14 is provided at the matching curved plate 12 and the corresponding large sensor installation opening;

[0048] The immersion depth and pitch angle of the underwater vehicle model 1 are adjusted by adjusting the position of the support rod 4 passing through the circular hole 10 on the connecting rod 3, and the flow angle of the underwater vehicle model 1 is adjusted by changing the angle between the support rod 4 and the side wall of the circulating water tank 17; the pulsating pressure and vibration acceleration laws of the underwater vehicle shell area under multiple working conditions are explored.

[0049] The positioning iron block 5 is provided with a square slot and an arched slot, wherein the square slot passes through the front and rear end surfaces of the positioning iron block 5, and the arched slot passes through the left and right end surfaces of the positioning iron block 5, wherein the square slot of the positioning iron block is used to engage with the side wall of the circulating water tank, and the arched slot is used to accommodate the support rod 4.

[0050] The cross-sectional shape of the connecting rod 3 is streamlined, which reduces the influence of the connecting rod on the test flow field.

[0051] The positions and numbers of the pressure sensor openings and the acceleration sensor studs in the underwater vehicle model pulsating load test device are set according to actual measurement requirements, and the sizes of the pressure sensor threaded holes and the acceleration sensor studs are adjusted according to the actual test sensor models; the test model is symmetrical, and the pressure sensor and the acceleration sensor can be arranged on both sides of the model respectively.

[0052] A plurality of connection holes are arranged on the periphery of the sensor installation large opening 7, and a plurality of threaded holes 13 are arranged on the matching curved plate 12, and the matching curved plate 12 is fixed to the corresponding sensor installation large opening 7 by screws passing through the threaded holes 13 and the corresponding connection holes. Such a design is connected and fixed, and water tightness is guaranteed.

[0053] The connecting rod 3 is made of a hollow tube while ensuring the structural strength, thereby reducing the structural weight; the supporting rod 4 is made of a hollow tube while ensuring the structural strength, thereby reducing the weight of the supporting rod.

[0054] The fairing 2 is streamlined, and a threaded hole 13 is set on the fairing 2. The fairing 2 is installed on the underwater vehicle model 1 by screws, and a sealing and waterproof rubber gasket is provided between the fairing 2 and the underwater vehicle model 1.

[0055] The test device of the present application enables the underwater vehicle model to meet the test conditions. If the immersion depth of the underwater vehicle model 1 needs to be adjusted, the position of the circular hole 10 through which the support rod 4 passes is changed; if the pitch angle of the underwater vehicle model 1 needs to be adjusted, one support rod remains stationary and the other support rod passes through a different circular hole; if the flow angle of the test model needs to be changed, the angle between the support rod 4 and the side wall of the circulating water tank can be adjusted.

[0056] The testing method of the pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle specifically comprises the following steps:

[0057] (1) Arrangement of sensors: Install the pressure sensor and the acceleration sensor at the predetermined position of the enclosure area of ​​the underwater vehicle model 1 through the pressure sensor threaded hole 6 and the acceleration sensor stud 9, apply glue or wrap raw tape on the pressure sensor threaded hole 6 for waterproofing, pass the sensor cable through the fairing 2, close the sensor installation large opening 7 with screws, and fix the fairing 2 on the underwater vehicle model 1;

[0058] (2) Assembling the test device: Use the threaded section 11 to fix the connecting rod 3 to the underwater vehicle model 1. The circular hole 10 on the connecting rod 3 should face the side wall of the circulating water tank 17. The support rod 4 passes through the circular hole 10 of the connecting rod 3 and spans the side wall of the circulating water tank 17. The positioning iron block 5 spans the support rod 4 and is placed on the edge of the side wall of the circulating water tank 17. Use the G-type woodworking clamp 15 to clamp the positioning iron block 5 and the edge of the circulating water tank 17. The connecting rod 3 and the support rod 4 are tied and fixed with ropes;

[0059] (3) Start the test: Use the circulating water tank flow rate control console to adjust the flow rate in the circulating water tank 17, and after the flow rate stabilizes, use the data acquisition instrument and supporting test software to collect data on pulsating pressure and vibration acceleration;

[0060] (4) Adjusting the model position: To change the immersion depth of the underwater vehicle model 1, loosen the G-type woodworking clamp 15, change the position of the support rod 4 passing through the circular hole 10 on the connecting rod 3, and the front and rear support rods 4 pass through the circular holes 10 located at the same height on the connecting rod 3 at the same time; to change the pitch angle of the underwater vehicle model 1, loosen the G-type woodworking clamp 15, keep one support rod 4 in place, and pass the other support rod 4 through a different circular hole 10; to change the flow angle of the underwater vehicle model 1, change the angle between the support rod 4 and the side wall of the circulating water tank 17;

[0061] (5) End of test: After repeating the above steps to complete the measurement task, use the circulating water tank flow rate control console to adjust the flow rate in the circulating water tank 17 to 0, and turn off the flow rate control system after the water flow in the circulating water tank 17 is still;

[0062] (6) Disassembling the test device: After the test is completed, loosen the G-type woodworking clamp 15, lift the support rod 4 to take the underwater vehicle model 1 out of the circulating water tank 17, take out the test sensor, and disassemble the parts of the test device.

[0063] The above disclosed embodiments of the invention are only used to help explain the invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the invention, so that those skilled in the art can understand and use the invention well.

Claims

1. A multi-degree-of-freedom underwater vehicle hull area pulsating load test device, characterized in that: The invention comprises a circulating water tank (16), an underwater vehicle model (1), a fairing (2), a connecting rod (3), a supporting rod (4) and a positioning iron block (5); the underwater vehicle model (1) is arranged inside the circulating water tank (16) and the head of the underwater vehicle model (1) faces the incoming flow direction of the circulating water tank (16); the underwater vehicle model (1) is turned over so that the enclosure (17) of the underwater vehicle model (1) faces downward; the fairing (2) is installed on the underwater vehicle model (1); during the test, the fairing (2) is exposed above the water surface and the enclosure (17) of the underwater vehicle model (1) is completely immersed in water; Two support rods (4) are provided, the length of the support rods (4) is greater than the width of the circulating water tank (16), the two support rods (4) are arranged in parallel, two connecting rods (3) are provided, a plurality of circular holes (10) are evenly provided on each connecting rod (3), the end of each connecting rod (3) is provided with a threaded section (11), one support rod (4) passes through a circular hole (10) on a connecting rod (3) and then spans the side wall of the circulating water tank (16), and both ends of each support rod (4) are positioned on the edge of the corresponding side wall of the circulating water tank (16) through a positioning iron block (5), and the positioning iron block (5) and the edge of the circulating water tank (16) are clamped by a clamp; the distance d between the centers of two adjacent circular holes (10) on the connecting rod (3) satisfies d=L·tanθ, wherein L is the distance between the two connecting rods (3), and θ is the minimum pitch angle required for the test; Two connecting rod threaded holes (8) are provided on the top of the underwater vehicle model (1), and the two connecting rod threaded holes (8) on the underwater vehicle model (1) are respectively connected to a threaded section (11) of a connecting rod (3), and the fairing (2) is located between the two connecting rods; a plurality of sensor installation large openings (7) are provided on the top of the underwater vehicle model (1), a plurality of pressure sensor threaded holes (6) are provided on the outer surface of the underwater vehicle model (1), and a plurality of acceleration sensor studs (9) are provided inside the underwater vehicle model (1), and the pressure sensor and the acceleration sensor are connected to the sensor. The velocity sensor is placed into the underwater vehicle model (1) through the sensor installation large opening (7), the acceleration sensor is installed on the acceleration sensor stud (9), the pressure sensor is installed on the pressure sensor threaded hole (6), and the surface of the pressure sensor is flush with the surface of the underwater vehicle model (1), and the cables of each sensor pass through the fairing (2); a matching curved plate (12) is provided at each sensor installation large opening of the underwater vehicle model (1), and a rubber sealing pad (14) is provided between the matching curved plate (12) and the corresponding sensor installation large opening; The immersion depth and pitch angle of the underwater vehicle model (1) are adjusted by adjusting the position of the supporting rod (4) passing through the circular hole (10) on the connecting rod (3), and the flow angle of the underwater vehicle model (1) is adjusted by changing the angle between the supporting rod (4) and the side wall of the circulating water tank (16).

2. The pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to claim 1 is characterized in that: The positioning iron block (5) is provided with a square slot and an arched slot, wherein the square slot passes through the front and rear end surfaces of the positioning iron block (5), and the arched slot passes through the left and right end surfaces of the positioning iron block (5), wherein the square slot of the positioning iron block (5) is used to engage with the side wall of the circulating water tank, and the arched slot is used to accommodate the support rod (4).

3. The pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to claim 1 is characterized in that: All pressure sensors and acceleration sensors are installed at designated locations in the hull area of ​​the underwater vehicle model (1).

4. The pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to claim 2 is characterized in that: The cross-sectional shape of the connecting rod (3) is streamlined.

5. The pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to claim 1 is characterized in that: The number of pressure sensor threaded holes (6) and acceleration sensor studs (9) can be flexibly adjusted according to test requirements.

6. The pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to claim 1 is characterized in that: A plurality of connection holes are arranged on the periphery of the sensor installation large opening (7), and a plurality of threaded holes (13) are arranged on the matching curved plate (12). The matching curved plate (12) is fixed to the corresponding sensor installation large opening (7) by screws passing through the threaded holes (13) and the corresponding connection holes.

7. The pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to claim 1 is characterized in that: The connecting rod (3) is a hollow tube; the supporting rod (4) is a hollow tube.

8. The pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to claim 1 is characterized in that: The fairing (2) is streamlined, a threaded hole (13) is provided on the fairing (2), the fairing (2) is mounted on the underwater vehicle model (1) by means of screws, and a sealing waterproof rubber gasket is provided between the fairing (2) and the underwater vehicle model (1).

9. The pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to claim 1 is characterized in that: The clamp is a G-type woodworking clamp (15).

10. The testing method of the pulsating load testing device for the hull area of ​​a multi-degree-of-freedom underwater vehicle according to any one of claims 1 to 9, characterized in that: The specific steps include: (1) Arranging sensors: installing the pressure sensor and the acceleration sensor at a predetermined position of the hull area of ​​the underwater vehicle model (1) through the pressure sensor threaded hole (6) and the acceleration sensor stud (9), applying glue or wrapping raw tape on the pressure sensor threaded hole (6) for waterproofing, passing the sensor cable through the fairing (2), closing the sensor installation large opening (7) with screws, and fixing the fairing (2) on the underwater vehicle model (1); (2) Assembling the test device: using the threaded section (11) to fix the connecting rod (3) and the underwater vehicle model (1), the circular hole (10) on the connecting rod (3) should face the side wall of the circulating water tank (16), the support rod (4) passes through the circular hole (10) of the connecting rod (3) and spans the side wall of the circulating water tank (16), the positioning iron block (5) spans the support rod (4) and is placed on the edge of the side wall of the circulating water tank (16), the positioning iron block (5) and the edge of the circulating water tank (16) are clamped by a G-type woodworking clamp (15), and the connecting rod (3) and the support rod (4) are tied and fixed with a rope; (3) Start the test: Use the circulating water tank flow rate control console to adjust the flow rate in the circulating water tank (16), and after the flow rate stabilizes, use the data acquisition instrument and supporting test software to collect data on pulsating pressure and vibration acceleration; (4) Adjusting the model position: if the immersion depth of the underwater vehicle model (1) is to be changed, the G-type woodworking clamp (15) is loosened, and the position of the supporting rod (4) passing through the circular hole (10) on the connecting rod (3) is changed, and the front and rear supporting rods (4) are simultaneously passed through the circular holes (10) located at the same height on the connecting rod (3); if the pitch angle of the underwater vehicle model (1) is to be changed, the G-type woodworking clamp (15) is loosened, and one supporting rod (4) is kept in place, and the other supporting rod (4) is passed through a different circular hole (10); if the flow angle of the underwater vehicle model (1) is to be changed, the angle between the supporting rod (4) and the side wall of the circulating water tank (16) is changed to achieve the desired effect; (5) End of test: After repeating the above steps to complete the measurement task, use the circulating water tank flow rate control console to adjust the flow rate in the circulating water tank (16) to 0, and turn off the flow rate control system after the water flow in the circulating water tank (16) becomes still; (6) Disassembling the test device: After the test is completed, loosen the G-type woodworking clamp (15), lift the support rod (4) to take the underwater vehicle model (1) out of the circulating water tank (16), take out the test sensor, and disassemble the parts of the test device.

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