A method for testing the drag and lift of a towed underwater vehicle in a water tank

Abstract

The present invention belongs to the technical field of hydrodynamic testing and relates to a towing resistance and lift tank test method for a towed underwater vehicle. As a method for verifying the feasibility of a towed underwater vehicle design scheme, the method comprises: recording the running speed V of a hydrodynamic test trailer (2), the depth d of the towed underwater vehicle (1) from the water surface tested by a water depth sensor (14), the pitch angle α / roll angle β / yaw angle γ of the towed underwater vehicle (1) tested by an inclination sensor (13), and the towing force F of a towing cable tested by a force sensor (9); judging the towing stability of the towed underwater vehicle (1) by the pitch angle α / roll angle β / yaw angle γ of the towed underwater vehicle (1); and calculating the lift L of the towed underwater vehicle (1) by the length S of the towing cable from a fixed pulley (7) to a towing point (12) of the underwater vehicle, the depth d of the towed underwater vehicle (1) from the water surface, and the towing force F of the towing cable.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrodynamic testing and relates to a method for testing the towing resistance and lift of a towed underwater vehicle in a water tank. Background Art

[0002] A towed underwater vehicle is a vehicle that navigates and operates stably underwater. The stability, drag, and lift performance of a towed underwater vehicle when towed underwater directly affect its safety and stability in use. Changes in the shape, weight center, and towing point position of a towed underwater vehicle directly affect the attitude of the towed underwater vehicle, thereby affecting the towing resistance and lift of the towed underwater vehicle. Compared with conventional surface ships and surface aircraft, changes in the shape and weight center of a towed underwater vehicle are more sensitive to its performance when gliding underwater. In order to accurately test the drag and lift performance of a towed underwater vehicle, underwater towing tests are generally required.

[0003] Currently, tank tests have only conducted stability verification tests for towed underwater vehicles with sinking wing configurations, but lack stability tests for towed underwater vehicles with rising wing configurations, as well as tests and evaluations of their drag and lift. This lacks comprehensive data support for the design of towed underwater vehicles, and there is currently no practical tank test method for towed underwater vehicle drag and lift. Therefore, it is necessary to conduct research on tank test methods for towed underwater vehicles, improve the technical means of towed underwater vehicle testing, accurately predict the hydrodynamic performance of towed underwater vehicles, and provide support for the development of towed underwater vehicles. Summary of the Invention

[0004] The purpose of the present invention is to provide a towing resistance and lift tank test method for a towed underwater vehicle as a verification method for the feasibility of a towed underwater vehicle design scheme.

[0005] The technical solution of the present invention is:

[0006] A method for testing the drag and lift of a towed underwater vehicle in a water tank, comprising:

[0007] Step 1: Measure the length S of the towing cable from the fixed pulley 7 to the towing point 12 of the underwater vehicle, and the depth D of the fixed pulley 7 from the water surface, and check to confirm that the pitch angle and roll angle of the towed underwater vehicle 1 are correct;

[0008] Step 2: Start the hydrodynamic test trailer 2 and turn on the camera 16 at the same time to observe the status of the towed underwater vehicle 1 during the test through the video. When the hydrodynamic test trailer 2 accelerates to the operating speed required by the test, turn on the micro data collector 15 and the acquisition control system 17 to start collecting test data.

[0009] Step 3. After the test is completed, record the running speed V of the hydrodynamic test trailer 2, the depth d of the towed underwater vehicle 1 from the water surface tested by the water depth sensor 14, the pitch angle α / roll angle β / yaw angle γ of the towed underwater vehicle 1 tested by the inclination sensor 13, and the towing force F of the towing cable tested by the force sensor 9. The towing stability of the towed underwater vehicle 1 is judged by the pitch angle α / roll angle β / yaw angle γ of the towed underwater vehicle 1. The resistance R and lift L of the towed underwater vehicle 1 are calculated by the length S of the towing cable from the fixed pulley 7 to the underwater vehicle towing point 12, the depth d of the towed underwater vehicle 1 from the water surface and the towing force F of the towing cable.

[0010] It also includes: Step 3: At the end of the test, the data analysis and processing personnel first analyze the validity of the collected data and eliminate the invalid data.

[0011] The specific calculation method for step 3 is as follows:

[0012]

[0013]

[0014] Before step 1, the test equipment installation is also included, specifically:

[0015] Connect the test adapter crab clamp 4 to the trailer bottom plate 3 through the screw 5, and at the same time connect the fixed pulley 7 to the underwater towing test sword 6 through the screw 5; connect the underwater towing test sword 6 with the fixed pulley 7 installed to the test adapter crab clamp 4 through the screw 5; connect the fixed pulley 7 to the underwater towing test sword 6 through the screw 5.

[0016] Before step 1, the test equipment installation and connection are also included, specifically:

[0017] Connect the force sensor 9 to the trailer floor 3 via the screw 5; connect the camera mounting bracket 19 to the trailer floor 3 via the screw 5, and then connect the camera 16 to the camera mounting bracket 19; connect the force sensor 9 and the camera 16 to the acquisition control system 17 via the data transmission line 18;

[0018] After the inclination sensor 13 , the water depth sensor 14 and the micro data collector 15 are installed inside the towed underwater vehicle 1 , the inclination sensor 13 and the water depth sensor 14 are connected to the micro data collector 15 via the data transmission line 18 .

[0019] Before step 1, the test piece installation is also included, specifically:

[0020] The towing cable 10 is passed through the inner hole 11 of the test piece. One end of the towing cable 10 is connected to the force sensor 9 , and the other end is connected to the underwater vehicle towing point 12 on the towed underwater vehicle 1 through the fixed pulley 7 .

[0021] It also includes: the towing cable 10 is kept in a vertical state and cannot interfere with the underwater towing test sword 6.

[0022] Also includes:

[0023] The towing cable 10 is installed inside the anti-falling limit pin 8.

[0024] The advantages of this invention are: by conducting research on a method for testing the drag and lift of a towed underwater vehicle, it can rapidly and accurately test the towing stability, drag, and lift of a towed underwater vehicle at different speeds, accurately predict the stability and speed of the towed underwater vehicle during underwater towing, and better optimize the configuration of the towed underwater vehicle. This method is practical, feasible, simple to operate, provides reliable test results, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a side structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0028] A method for testing the drag and lift of a towed underwater vehicle in a water tank, such as Figure 1 、 2 Shown, including:

[0029] a) Installation of test equipment

[0030] Connect the test adapter crab clamp 4 to the trailer bottom plate 3 through the screw 5, and at the same time connect the fixed pulley 7 to the underwater towing test sword 6 through the screw 5; connect the underwater towing test sword 6 with the fixed pulley 7 installed to the test adapter crab clamp 4 through the screw 5; connect the fixed pulley 7 to the underwater towing test sword 6 through the screw 5.

[0031] b) Installation and connection of test equipment

[0032] Connect the force sensor 9 to the trailer floor 3 through the screw 5; after connecting the camera mounting bracket 19 to the trailer floor 3 through the screw 5, connect the camera 16 to the camera mounting bracket 19; connect the force sensor 9 and the camera 16 to the acquisition control system 17 through the data transmission line 18.

[0033] After the inclination sensor 13 , the water depth sensor 14 and the micro data collector 15 are installed inside the towed underwater vehicle 1 , the inclination sensor 13 and the water depth sensor 14 are connected to the micro data collector 15 via the data transmission line 18 .

[0034] c) Test piece installation

[0035] Pass the towing cable 10 through the inner hole 11 of the test piece. The towing cable 10 should remain in a vertical state and cannot interfere with the underwater towing test sword 6. One end of the towing cable 10 is connected to the force sensor 9, and the other end is connected to the underwater vehicle towing point 12 on the towed underwater vehicle 1 through the fixed pulley 7. The towing cable 10 should be installed within the anti-fall limit pin 8 to prevent the towing cable 10 from spinning out of the fixed pulley 7 during the test.

[0036] d) Towing stability, resistance and lift test of towed underwater vehicle

[0037] After completing the installation of the test device, test equipment and test pieces, measure the length S of the towing cable from the fixed pulley 7 to the towing point 12 of the underwater vehicle and the depth D of the fixed pulley 7 from the water surface. After checking and confirming that the pitch angle, roll angle and other conditions of the towed underwater vehicle 1 are correct, start the hydrodynamic test trailer 2 and turn on the camera 16 at the same time. Observe the status of the towed underwater vehicle 1 during the test through video recording. When the hydrodynamic test trailer 2 accelerates to the operating speed required by the test, turn on the micro data collector 15 and the acquisition control system 17 to start collecting test data.

[0038] After the test, the data analysis and processing personnel should first analyze the validity of the collected data, eliminate invalid data, and record parameters such as the running speed V of the hydrodynamic test trailer 2, the depth d of the towed underwater vehicle 1 from the water surface tested by the water depth sensor 14, the pitch angle α / roll angle β / yaw angle γ of the towed underwater vehicle 1 tested by the inclination sensor 13, and the towing force F of the towing cable tested by the force sensor 9. The towing stability of the towed underwater vehicle 1 can be judged by the pitch angle α / roll angle β / yaw angle γ of the towed underwater vehicle 1, and the resistance R and lift L of the towed underwater vehicle 1 can be calculated by the length S of the towing cable from the fixed pulley 7 to the underwater vehicle towing point 12, the depth d of the towed underwater vehicle 1 from the water surface, and the towing force F of the towing cable. The specific calculation method is as follows:

[0039]

[0040]

Claims

1. A method for testing the drag and lift of a towed underwater vehicle in a water tank, characterized in that: include: Step 1: Measure the length S of the towing cable from the fixed pulley (7) to the towing point (12) of the underwater vehicle, and the depth D of the fixed pulley (7) from the water surface, and check and confirm that the pitch angle and roll angle of the towed underwater vehicle (1) are correct; Step 2: while starting the hydrodynamic test trailer (2), turning on the camera (16), observing the state of the towed underwater vehicle (1) during the test through the video recording, and when the hydrodynamic test trailer (2) accelerates to reach the operating speed required by the test, turning on the micro data collector (15) and the acquisition control system (17) to start collecting test data; Step 3. After the test is completed, record the running speed V of the hydrodynamic test trailer (2), the depth d of the towed underwater vehicle (1) from the water surface tested by the water depth sensor (14), the pitch angle α / roll angle β / yaw angle γ of the towed underwater vehicle (1) tested by the inclination sensor (13), and the towing force F of the towing cable tested by the force sensor (9). The towing stability of the towed underwater vehicle (1) is determined by the pitch angle α / roll angle β / yaw angle γ of the towed underwater vehicle (1). The resistance R and lift L of the towed underwater vehicle (1) are calculated by the length S of the towing cable from the fixed pulley (7) to the underwater vehicle towing point (12), the depth d of the towed underwater vehicle (1) from the water surface, and the towing force F of the towing cable.

2. A method for testing the drag and lift of a towed underwater vehicle in a water tank according to claim 1, characterized in that: It also includes: Step 3: At the end of the test, the data analysis and processing personnel first analyze the validity of the collected data and eliminate the invalid data.

3. A method for testing the drag and lift of a towed underwater vehicle in a water tank according to claim 1, characterized in that: The specific calculation method for step 3 is as follows: 。 4. A method for testing the drag and lift of a towed underwater vehicle in a water tank according to claim 1, characterized in that: Before step 1, the test equipment installation is also included, specifically: The test adapter crab clamp (4) is connected to the trailer bottom plate (3) through the screw (5), and the fixed pulley (7) is connected to the underwater towing test sword (6) through the screw (5); the underwater towing test sword (6) equipped with the fixed pulley (7) is connected to the test adapter crab clamp (4) through the screw (5); the fixed pulley (7) is connected to the underwater towing test sword (6) through the screw (5).

5. A method for testing the drag and lift of a towed underwater vehicle in a water tank according to claim 1, characterized in that: Before step 1, the test equipment installation and connection are also included, specifically: The force sensor (9) is connected to the trailer bottom plate (3) through the screw (5); after the camera mounting bracket (19) is connected to the trailer bottom plate (3) through the screw (5), the camera (16) is connected to the camera mounting bracket (19); the force sensor (9) and the camera (16) are connected to the acquisition control system (17) through the data transmission line (18); After the inclination sensor (13), the water depth sensor (14) and the micro data collector (15) are installed inside the towed underwater vehicle (1), the inclination sensor (13) and the water depth sensor (14) are connected to the micro data collector (15) via a data transmission line (18).

6. A method for testing the drag and lift of a towed underwater vehicle in a water tank according to claim 1, characterized in that: Before step 1, the test piece installation is also included, specifically: A towing cable (10) is passed through an inner hole (11) of the test piece, one end of the towing cable (10) is connected to a force sensor (9), and the other end is connected to an underwater vehicle towing point (12) on the towed underwater vehicle (1) through a fixed pulley (7).

7. A method for testing the drag and lift of a towed underwater vehicle in a water tank according to claim 6, characterized in that: Also includes: The towing cable (10) remains in a vertical position and cannot interfere with the underwater towing test sword (6).

8. A method for testing the drag and lift of a towed underwater vehicle in a water tank according to claim 7, characterized in that: Also includes: The towing cable (10) is installed inside the anti-fall-off limit pin (8).

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