An underwater vehicle model pulsating load testing device and testing method

Abstract

The present invention provides an underwater vehicle model pulsating load testing device and a testing method, belonging to the field of ship and ocean engineering testing. It includes an underwater vehicle model, a circulating water channel, connecting components, supporting components and fixing components. The connecting components include a head connecting rod and a tail connecting rod, which are respectively arranged on the head and tail sides of the top of the underwater vehicle model. Both the head connecting rod and the tail connecting rod are connected to the supporting components, and the supporting components are connected to the side wall of the circulating water channel through the fixing components. The head of the underwater vehicle model faces the oncoming flow direction of the circulating water channel, the sail of the underwater vehicle is arranged vertically upward, and the sail is located between the head connecting rod and the tail connecting rod. A fairing is sleeved outside the sail. An acceleration sensor and a pressure sensor are arranged on the underwater vehicle model. It is mainly used for pulsating load testing of the underwater vehicle model under different working conditions.

Description

Technical Field

[0001] The present invention belongs to the field of ship and ocean engineering testing, and particularly relates to an underwater vehicle model pulsating load testing device and a testing method. Background Art

[0002] The vibration and flow-induced noise conditions of an underwater vehicle during submerged navigation are of great significance for the study of its acoustic stealth performance. By measuring the pulsating pressure and vibration acceleration response on the surface of the underwater vehicle model through pulsating load tests, the formation and propagation laws of its flow-induced noise can be analyzed, which is of guiding significance for reducing the flow-induced noise of the underwater vehicle, improving its concealment and navigation safety. At the same time, conducting flow-induced tests on the underwater vehicle can detect acoustic problems existing in ship structure design in advance, and play a multiplier effect on ship acoustic design.

[0003] A circulating water channel is a large-scale test device composed of an oscillation mechanism, a drive motor control system, and a data acquisition system. The operator can send commands to the drive motor through a flow rate control console to adjust the motor speed, so as to obtain the required flow rate for flow-induced tests, and at the same time realize the recycling of water in the water channel. The circulating water channel has a series of advantages such as good flow rate control effect and large working section size, and is a commonly used device for underwater model tests. Therefore, developing and designing an underwater vehicle model pulsating load testing device based on the circulating water channel has broad application prospects and great application value.

[0004] Through a literature search of the existing technology, no technologies related to an underwater structure pulsating load testing device and a testing method in a circulating water channel were found. Summary of the Invention

[0005] In view of this, the present invention aims to propose an underwater vehicle model pulsating load testing device and a testing method to solve the problems existing in the background art.

[0006] To achieve the above object, the present invention adopts the following technical solutions: An underwater vehicle model pulsating load testing device includes an underwater vehicle model, a circulating water channel, a connecting component, a supporting component, and a fixing component. The connecting component includes a head connecting rod and a tail connecting rod. The head connecting rod and the tail connecting rod are respectively arranged on the head and tail sides of the top of the underwater vehicle model. The head connecting rod and the tail connecting rod are both connected to the supporting component. The supporting component is connected to the side wall of the circulating water channel through the fixing component. The head of the underwater vehicle model faces the oncoming flow direction of the circulating water channel. A sail is arranged on the underwater vehicle model. The sail is arranged vertically upward. The sail is arranged between the head connecting rod and the tail connecting rod. A fairing is sleeved outside the sail. An acceleration sensor and a pressure sensor are arranged on the underwater vehicle model.

[0007] Furthermore, the support member includes a head support rod and a tail support rod. The head support rod is perpendicularly connected to the head connecting rod, and the tail support rod is perpendicularly connected to the tail connecting rod. The head support rod and the tail support rod are respectively connected to the side wall of the circulating water tank through fixing members.

[0008] Furthermore, the fixing member includes a fixing iron block and a G-shaped woodworking clamp. Fixing iron blocks are arranged at both ends of the head support rod and the tail support rod, and the G-shaped woodworking clamp clamps the fixing iron block and the edge of the side wall of the circulating water tank.

[0009] Furthermore, pressure sensor threaded holes are provided on the outer surface of the underwater vehicle model. A large sensor installation opening is provided at the bottom of the underwater vehicle model. An acceleration sensor stud is provided inside the underwater vehicle model. The pressure sensor is connected to the outer surface of the underwater vehicle model through the pressure sensor threaded hole, and the acceleration sensor is installed on the acceleration sensor stud through the large sensor installation opening.

[0010] Furthermore, a curved plate is provided outside the large sensor installation opening. Threaded holes are provided on the underwater vehicle model, the fairing, and the curved plate. The fairing and the curved plate are connected to the underwater vehicle model through the cooperation of the threaded holes and screws. Rubber gaskets are provided between the large sensor installation opening and the curved plate and between the fairing and the underwater vehicle model.

[0011] Furthermore, the cables of the pressure sensor and the acceleration sensor pass through the sail and the fairing.

[0012] Furthermore, threaded holes for connecting rods are provided at the top of the underwater vehicle model. Connecting threads are provided at the bottom ends of the head connecting rod and the tail connecting rod. The connecting threads and the threaded holes for connecting rods are cooperatively connected.

[0013] Furthermore, a support hole is provided on the head connecting rod, and an oblong support hole is provided on the tail connecting rod. The support hole and the oblong support hole are both facing the side wall of the circulating water tank. The head support rod passes through the support hole, and the tail support rod passes through the oblong support hole. Threads are provided on the tail support rod, and the position of the tail support rod and the tail connecting rod is fixed through the cooperation of the threads and a hexagonal nut. Scale lines are provided on one side of the oblong support hole.

[0014] Furthermore, the head connecting rod, the tail connecting rod, the head support rod, and the tail support rod are all of a hollow tube structure, and the cross-sections of the head connecting rod and the tail connecting rod are streamlined.

[0015] The present invention also includes a method for testing the pulsating load of an underwater vehicle model, which includes the following steps:

[0016] Step 1: Install the pressure sensor and the acceleration sensor at the predetermined position of the underwater vehicle model through the threaded hole of the pressure sensor and the stud of the acceleration sensor, seal the large opening for sensor installation, and fix the fairing on the sail.

[0017] Step 2: Fix the front connecting rod and the rear connecting rod to the underwater vehicle model. The front support rod and the rear support rod pass through the support hole and the oblong support hole respectively, tighten and fix the rear support rod. The support component straddles the side wall of the circulating water channel, and fix the support component on the circulating water channel through the fixing component.

[0018] Step 3: Use the flow velocity control console of the circulating water channel to adjust the flow velocity in the water channel. After the flow velocity is stable, use the data acquisition instrument and the supporting test software to collect the data of pulsating pressure and vibration acceleration.

[0019] Step 4: When changing the pitch angle of the underwater vehicle model, loosen the fixing component, keep the position of the front support rod unchanged, and fix it after adjusting the rear support rod to pass through different positions of the oblong support hole; when changing the flow angle of the underwater vehicle model, change the included angles between the front support rod and the rear support rod and the side wall of the circulating water channel.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention can flexibly adjust the flow angle and pitch angle of the underwater vehicle model with multiple degrees of freedom according to the test requirements, and measure the pulsating pressure and vibration acceleration of the test model under different working conditions. The present invention has a simple structure, is easy to maintain, has good adaptability, a wide application range, and reduces the test difficulty of the pulsating load of the underwater vehicle model.

[0021] The present invention can flexibly change the position of the sensor according to the research requirements, can change the device size according to the test site conditions, complete the test of pulsating pressure and vibration acceleration of the underwater vehicle under different working conditions, and provide data support for the research on the pulsating load characteristics of the underwater vehicle. The present invention has the advantages of simple structure, convenient operation, wide application range, etc. It can flexibly adjust the model attitude according to the actual test environment, and improves the convenience of working condition adjustment during the pulsating load test of the underwater vehicle model in the circulating water channel device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 is a schematic three-dimensional structure diagram of a pulsating load test device for an underwater vehicle model according to the present invention;

[0024] Figure 2 is a schematic connection structure diagram of the underwater vehicle model according to the present invention;

[0025] Figure 3 Schematic diagram of the three-dimensional structure of the underwater vehicle model according to the present invention;

[0026] Figure 4 Schematic diagram of the lower structure of the underwater vehicle model according to the present invention;

[0027] Figure 5 Schematic diagram of the structure of the connecting component according to the present invention;

[0028] Figure 6 Schematic diagram of the structure of the tail support rod according to the present invention;

[0029] Figure 7 Schematic diagram of the structure of the curved plate according to the present invention;

[0030] Figure 8 Schematic diagram of the structure of the G-type woodworking clamp according to the present invention.

[0031] 1 - Underwater vehicle model, 2 - Fairing, 3 - Front connecting rod, 4 - Tail connecting rod, 5 - Front support rod, 6 - Tail support rod, 7 - Fixed iron block, 8 - Pressure sensor threaded hole, 9 - Large opening for sensor installation, 10 - Connecting rod threaded hole, 11 - Accelerometer stud, 12 - Support hole, 13 - Oval support hole, 14 - Connecting thread, 15 - Thread, 16 - Hexagonal nut, 17 - Curved plate, 18 - Threaded hole, 19 - Rubber gasket, 20 - G-type woodworking clamp. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] See Figure 1-8Description of this embodiment, an underwater vehicle model pulsating load testing device, which includes an underwater vehicle model 1, a circulating water tank, connecting components, supporting components and fixing components. The connecting components include a head connecting rod 3 and a tail connecting rod 4. The head connecting rod 3 and the tail connecting rod 4 are respectively arranged on the head and tail sides of the top of the underwater vehicle model 1. The head connecting rod 3 and the tail connecting rod 4 are both connected to the supporting components. The supporting components are connected to the side wall of the circulating water tank through the fixing components. The head of the underwater vehicle model 1 faces the oncoming flow direction of the circulating water tank. A sail is provided on the underwater vehicle model 1. The sail is arranged vertically upward. The sail is arranged between the head connecting rod 3 and the tail connecting rod 4. A fairing 2 is sleeved outside the sail. Acceleration sensors and pressure sensors are provided on the underwater vehicle model 1.

[0034] The supporting components in this embodiment include a head supporting rod 5 and a tail supporting rod 6. The lengths of the head supporting rod 5 and the tail supporting rod 6 are slightly greater than the width of the circulating water tank. The head supporting rod 5 is vertically connected to the head connecting rod 3. The tail supporting rod 6 is vertically connected to the tail connecting rod 4. The head supporting rod 5 and the tail supporting rod 6 are respectively connected to the side wall of the circulating water tank through the fixing components.

[0035] The fixing components include fixing iron blocks 7 and G-shaped woodworking clamps 20. Fixing iron blocks 7 are provided at both ends of the head supporting rod 5 and the tail supporting rod 6. The head supporting rod 5 and the tail supporting rod 6 pass through the fixing iron blocks 7. The G-shaped woodworking clamps 20 clamp the fixing iron blocks 7 and the edge of the side wall of the circulating water tank.

[0036] Pressure sensor threaded holes 8 are provided on the outer surface of the underwater vehicle model 1. A large sensor installation opening 9 is provided at the bottom of the underwater vehicle model 1. An acceleration sensor stud 11 is provided inside the underwater vehicle model 1. The pressure sensor is connected to the outer surface of the underwater vehicle model 1 through the pressure sensor threaded holes 8. The acceleration sensor is installed on the acceleration sensor stud 11 through the sensor installation large opening 9. The number of both the acceleration sensors and the pressure sensors is several. The test pressure sensors are flush with the surface of the underwater vehicle model 1 through the pressure sensor threaded holes 8.

[0037] The positions and numbers of the pressure sensor threaded holes 8 and the acceleration sensor studs 11 are set according to actual measurement requirements. The sizes of the pressure sensor threaded holes 8 and the acceleration sensor studs 11 are adjusted according to the actual test sensor models. The underwater vehicle model 1 has symmetry. The pressure sensor threaded holes 8 and the acceleration sensor studs 11 are respectively arranged on the left and right sides of the underwater vehicle model 1.

[0038] A curved plate 17 is arranged outside the large sensor installation opening 9. Threaded holes 18 are provided on the underwater vehicle model 1, the fairing 2, and the curved plate 17. The fairing 2 and the curved plate 17 are connected to the underwater vehicle model 1 through the cooperation of the threaded holes 18 and screws. Rubber gaskets 19 are arranged between the large sensor installation opening 9 and the curved plate 17 and between the fairing 2 and the underwater vehicle model 1 for watertight treatment. A matching sealed curved plate 17 is provided at the large sensor installation opening 9. After the sensors required for the test are installed, the curved plate 17 is installed at the large sensor installation opening 9 through screws, and a rubber gasket 19 is used for sealing and waterproofing between the two.

[0039] The size of the fairing 2 is slightly larger than that of the sail. The fairing 2 is installed on the sail through screws, and a rubber gasket 19 is used for sealing and waterproofing between the two. The fairing should be exposed above the water surface during the test. The cables of the pressure sensor and the acceleration sensor pass through the sail and the fairing 2 to prevent the sensor cables from being damaged by the water flow.

[0040] Threaded holes 10 for connecting rods are provided at the top of the underwater vehicle model 1. Connecting threads 14 are provided at the bottom ends of the front connecting rod 3 and the rear connecting rod 4. The connecting threads 14 are connected in cooperation with the threaded holes 10 for connecting rods.

[0041] Support holes 12 are provided on the front connecting rod 3, and oblong support holes 13 are provided on the rear connecting rod 4. The support holes 12 and the oblong support holes 13 are both facing the side wall of the circulating water channel. The front support rod 5 passes through the support hole 12, and the rear support rod 6 passes through the oblong support hole 13. Threads 15 are provided on the rear support rod 6. The position of the rear support rod 6 and the rear connecting rod 4 is fixed through the cooperation of the threads 15 and the hexagonal nut 16. Scale lines are provided on one side of the oblong support hole 13, which is convenient for adjusting the angle and also used for recording the offset distance d. The offset distance d can be adjusted according to the length L between the front connecting rod 3 and the rear connecting rod 4 and the required pitch angle θ for the test. The specific calculation formula is as follows: d = L·tanθ.

[0042] Furthermore, the front connecting rod 3, the rear connecting rod 4, the front support rod 5, and the rear support rod 6 can use a hollow tube structure on the premise of ensuring the structural strength to reduce the structural weight. The cross-sections of the front connecting rod 3 and the rear connecting rod 4 are streamlined to reduce the influence of the front connecting rod 3 and the rear connecting rod 4 on the test flow field.

[0043] This embodiment is a method for testing the pulsating load of an underwater vehicle model, which includes the following steps:

[0044] Arranging sensors: Install the pressure sensor and the acceleration sensor at the predetermined positions on the underwater vehicle model 1 through the threaded hole 8 of the pressure sensor and the stud 11 of the acceleration sensor. Apply glue or wrap PTFE tape at the sensor openings of the underwater vehicle model 1 for waterproof treatment. The cables of the pressure sensor and the acceleration sensor pass through the fairing and the nose cone 2, close the large opening 9 for sensor installation with screws, and fix the nose cone 2 on the fairing;

[0045] Assembling the test device: Fix the front connecting rod 3 and the rear connecting rod 4 to the underwater vehicle model 1 with threads, ensuring that the support holes 12 and the oblong support holes 13 are both facing the side wall of the circulating water channel. The front support rod 5 and the rear support rod 6 pass through the support hole 12 and the oblong support hole 13 respectively, and tighten and fix the rear support rod 6 with the hexagon nut 16. The front support rod 5 and the rear support rod 6 span across the side wall of the circulating water channel, and the fixing iron block 7 is placed across the front support rod 5 and the rear support rod 6 on the edge of the side wall of the circulating water channel, and clamp and fix the fixing iron block 7 and the edge of the side wall of the circulating water channel with a G-type woodworking clamp 20;

[0046] Starting the test: Adjust the flow rate in the water channel with the circulating water channel flow rate control console. After the flow rate is stable, use the data acquisition instrument and the supporting test software to collect the data of pulsating pressure and vibration acceleration;

[0047] Adjusting the model position: When changing the pitch angle of the underwater vehicle model 1, loosen the G-type woodworking clamp 20, keep the position of the front support rod 5 unchanged, loosen the hexagon nut 16, adjust the rear support rod 6 to pass through different positions of the oblong support hole 13, and fix it with the hexagon nut 16. When changing the flow angle of the underwater vehicle model 1, just change the included angles between the front support rod 5 and the rear support rod 6 and the side wall of the circulating water channel.

[0048] Ending the test: After repeating the above steps to complete the measurement task, adjust the flow rate in the water channel to 0 with the circulating water channel flow rate control console, and turn off the flow rate control system after the water in the circulating water channel is stationary.

[0049] Disassembling the test device: After the test is over, loosen the G-type woodworking clamp 20, lift the front support rod 5 and the rear support rod 6 to take out the underwater vehicle model 1 from the circulating water channel, take out the pressure sensor and the acceleration sensor for testing, and disassemble the other components of the test device.

[0050] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. According to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well.

Claims

1. An underwater vehicle model pulsating load testing device, characterized in that: It includes an underwater vehicle model (1), a circulating water channel, connecting components, supporting components and fixing components. The connecting components include a front connecting rod (3) and a rear connecting rod (4). The front connecting rod (3) and the rear connecting rod (4) are respectively arranged on the head and tail sides of the top of the underwater vehicle model (1). The front connecting rod (3) and the rear connecting rod (4) are both connected to the supporting components. The supporting components are connected to the side wall of the circulating water channel through the fixing components. The head of the underwater vehicle model (1) faces the oncoming flow direction of the circulating water channel. A fairing is arranged on the underwater vehicle model (1). The fairing is arranged vertically upward. The fairing is arranged between the front connecting rod (3) and the rear connecting rod (4). A fairing cover (2) is sleeved outside the fairing. An acceleration sensor and a pressure sensor are arranged on the underwater vehicle model (1). A pressure sensor threaded hole (8) is arranged on the outer surface of the underwater vehicle model (1). A large sensor installation opening (9) is arranged at the bottom of the underwater vehicle model (1). An acceleration sensor stud (11) is arranged inside the underwater vehicle model (1). The pressure sensor is connected to the outer surface of the underwater vehicle model (1) through the pressure sensor threaded hole (8). The acceleration sensor is installed on the acceleration sensor stud (11) through the large sensor installation opening (9).

2. The pulsating load testing device for an underwater vehicle model according to claim 1, wherein: The supporting components include a front supporting rod (5) and a rear supporting rod (6). The front supporting rod (5) is perpendicularly connected to the front connecting rod (3). The rear supporting rod (6) is perpendicularly connected to the rear connecting rod (4). The front supporting rod (5) and the rear supporting rod (6) are respectively connected to the side wall of the circulating water channel through the fixing components.

3. The pulsating load testing device for an underwater vehicle model according to claim 2, characterized in that: The fixing components include fixing iron blocks (7) and G-shaped woodworking clamps (20). Fixing iron blocks (7) are arranged at both ends of the front supporting rod (5) and the rear supporting rod (6). The G-shaped woodworking clamps (20) clamp the fixing iron blocks (7) and the edge of the side wall of the circulating water channel.

4. An underwater vehicle model pulsating load testing device according to claim 1, characterized in that: A curved plate (17) is arranged outside the large sensor installation opening (9). Threaded holes (18) are arranged on the underwater vehicle model (1), the fairing cover (2) and the curved plate (17). The fairing cover (2) and the curved plate (17) are both connected to the underwater vehicle model (1) through the cooperation of the threaded holes (18) and screws. Rubber gaskets (19) are arranged between the large sensor installation opening (9) and the curved plate (17) and between the fairing cover (2) and the underwater vehicle model (1).

5. The pulsating load testing device for an underwater vehicle model according to claim 1, characterized in that: The cables of the pressure sensor and the acceleration sensor pass through the fairing and the fairing cover (2).

6. The pulsating load testing device for an underwater vehicle model according to claim 1, wherein: A connecting rod threaded hole (10) is arranged at the top of the underwater vehicle model (1). Connecting threads (14) are arranged at the bottom ends of the front connecting rod (3) and the rear connecting rod (4). The connecting threads (14) and the connecting rod threaded hole (10) are cooperatively connected.

7. An underwater vehicle model pulsating load testing device according to claim 2, characterized in that: A support hole (12) is formed in the head connecting rod (3), and an oblong support hole (13) is formed in the tail connecting rod (4). The support hole (12) and the oblong support hole (13) are both facing the side wall of the circulation water tank. The head support rod (5) passes through the support hole (12), and the tail support rod (6) passes through the oblong support hole (13). A thread (15) is provided on the tail support rod (6), and the position of the tail support rod (6) and the tail connecting rod (4) is fixed by the cooperation of the thread (15) and the hexagonal nut (16). Scale lines are provided on one side of the oblong support hole (13).

8. An underwater vehicle model pulsating load testing device according to claim 2, characterized in that: The head connecting rod (3), the tail connecting rod (4), the head support rod (5) and the tail support rod (6) are all of hollow tube structure, and the cross sections of the head connecting rod (3) and the tail connecting rod (4) are streamlined.

9. A testing method for a pulsating load testing device of an underwater vehicle model as described in claim 1, characterized in that: It includes the following steps: Step 1: Install the pressure sensor and the acceleration sensor at the predetermined positions of the underwater vehicle model (1) through the pressure sensor threaded hole (8) and the acceleration sensor stud (11), close the large opening (9) for sensor installation, and fix the fairing (2) on the sail. Step 2: Fix the head connecting rod (3) and the tail connecting rod (4) to the underwater vehicle model (1). The head support rod (5) and the tail support rod (6) respectively pass through the support hole (12) and the oblong support hole (13), and tighten and fix the tail support rod (6). The support member straddles the side wall of the circulation water tank, and the support member is fixed to the circulation water tank through the fixing member. Step 3: Use the flow velocity control console of the circulation water tank to adjust the flow velocity in the water tank. After the flow velocity is stable, use the data acquisition instrument and the supporting test software to collect the data of pulsating pressure and vibration acceleration. Step 4: When changing the pitch angle of the underwater vehicle model (1), loosen the fixing member, keep the position of the head support rod (5) unchanged, adjust the tail support rod (6) to pass through different positions of the oblong support hole (13) and then fix it; when changing the flow angle of the underwater vehicle model (1), change the included angles between the head support rod (5) and the tail support rod (6) and the side wall of the circulation water tank.

Images