Towing device for underwater vehicle model wake test

Abstract

The present application relates to a kind of for underwater vehicle model wake test drag device, comprising: track, fixedly arranged in the pool bottom of the pool for the wake test;Vehicle body, slidingly installed on the track, the sliding direction of the vehicle body is linear direction;Sword rod, lower end is fixedly connected with the vehicle body, and upper end is used to connect the vehicle model;Traction system, including front traction line, first fixed pulley being arranged in the sliding direction pool one end side wall, and being provided with traction mechanism outside pool, one end of the front traction line is connected with the vehicle body, the middle part of the front traction line is in contact with first fixed pulley, the other end of the front traction line is drivingly connected with the traction mechanism, and the traction mechanism is used to shorten the length of front traction line, in turn drive the vehicle body sliding, to adapt to high angle of attack pitch / yaw condition vehicle model, meet the technical requirement of underwater vehicle wake characteristics test, guarantee the reliability of test data.

Description

Technical Field

[0001] This invention relates to the field of hydrodynamics technology in shipbuilding and marine engineering, and in particular to a towing device for wake testing of underwater vehicle models. Background Technology

[0002] The wake characteristics of underwater vehicles are a very important research subject, and hydrodynamic testing is an indispensable and important means of this research. The installation and movement of the test model are important parts of the model test.

[0003] In traditional hydrodynamic tests of ship models, there are two main modes of model motion, both of which have significant drawbacks: One method involves using one or two vertical swords to connect and fix the underwater vehicle. However, in this installation method, the vertical swords are installed above the underwater vehicle model. The wake generated by the sword movement, especially the sword's wake on the water surface, directly interferes with the wake on the underwater vehicle model, which has an adverse effect on the experimental research of the underwater vehicle's wake characteristics. This results in distorted wake characteristic detection data and fails to meet the accuracy requirements of high angle of attack pitch / yaw wake tests. Secondly, the method of using underwater guide ropes for guidance and towing ropes is only suitable for wake tests of underwater vehicle models when the pitch and drift angles are zero. When the pitch / yaw angles are not zero, especially when the pitch and drift angles are greater than or equal to 6 degrees, the model will generate large vertical / lateral and pitch / yaw moments, resulting in significant additional vibrations and even attitude instability. This seriously affects the normal conduct of the wake test and makes it impossible to guarantee the reliability of the test data.

[0004] The towing device in the above-mentioned motion mode limits the conduct of high angle-of-attack pitch / yaw wake tests. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a towing device for wake testing of underwater vehicle models, thereby adapting to vehicle models under high angle of attack pitch / yaw conditions, meeting the technical requirements for underwater vehicle wake characteristic testing, and ensuring the reliability of test data.

[0006] The technical solution adopted in this invention is as follows: A towing device for wake testing of an underwater vehicle model includes: The track is fixedly installed at the bottom of the pool where the wake test is conducted; The vehicle body is slidably mounted on the track, and the sliding direction of the vehicle body is a straight line. The lower end of the sword shaft is fixedly connected to the vehicle body, and the upper end is used to connect to the aircraft model. The traction system includes a front traction line, a first fixed pulley disposed on the side wall of one end of the water tank in the sliding direction, and a traction mechanism disposed outside the water tank. One end of the front traction line is connected to the vehicle body, the middle part of the front traction line is in contact with the first fixed pulley, and the other end of the front traction line is connected to the traction mechanism for transmission. The traction mechanism is used to shorten the length of the front traction line, thereby driving the vehicle body to slide.

[0007] As a further improvement to the above technical solution: The number of tracks is two, which are arranged side by side, and the vehicle body is located between the two tracks; A set of rollers is installed on each side of the vehicle body in the horizontal direction perpendicular to the sliding direction. Each set of rollers includes a front roller and a rear roller rotatably mounted on the vehicle body. The front roller and the rear roller are arranged at intervals along the sliding direction. The track is provided with guide surfaces, and the projections of each guide surface in the sliding direction coincide and form a first arc. The front roller and the rear roller have the same structure. The front roller includes a roller body. The outer peripheral surface of the roller body is a rotating surface centered on the axis of rotation of the roller body. The generatrix of the outer peripheral surface is a second arc. The projections of the first arc and the second arc in the sliding direction coincide, which allows the track to slide with the vehicle body while limiting the relative displacement between the track and the vehicle body in the direction perpendicular to the sliding direction.

[0008] The length of the first arc is greater than the length of the second arc.

[0009] The track has a circular cross-section.

[0010] The towing device also includes: Multiple suction cup assemblies are fixedly connected to the track, and the cup body of the suction cup assembly forms a sealed cavity with the bottom of the pool; A vacuum system, connected to each suction cup assembly, is used to extract air from the sealed cavity, thereby fixing the track to the bottom of the pool.

[0011] The towing device also includes a frame structure mounting bracket, which is fixedly connected to the track, and the suction cup assembly is fixedly mounted on the lower part of the mounting bracket.

[0012] The vacuum system includes: Supervisor Road; A vacuum pump is connected to the main pipeline; Multiple branch pipes correspond one-to-one with the suction cup assembly, and the branch pipes connect the sealing cavity to the main pipe. The valve is located on the branch pipe; A pressure sensor is installed on the branch pipe and located between the valve and the suction cup assembly to detect the pressure value inside the sealed cavity.

[0013] The towing device also includes two spaced-apart cover plates with horizontal upper surfaces and a gap between them. The sword rod is located in the gap, and the track and the vehicle body are located in the space formed by the two cover plates and the bottom of the pool. The length direction of the gap is consistent with the sliding direction, and the width of the gap is adapted to the sword rod.

[0014] The lower surface of the cover plate is inclined, and the lower surface gradually rises from the gap away from the gap, and the sidewalls of the gap are all vertical. The upper surface extends to the front of the pool sidewall in a direction perpendicular to the sliding direction. The end of the cover plate facing the pool sidewall has an arc surface that protrudes towards the pool sidewall and transitions between the lower surface and the upper surface.

[0015] The traction system also includes a rear traction line and a second fixed pulley disposed on the side wall of the other end of the sliding direction pool. The traction mechanism is a motor, and a drum is provided on the output shaft of the motor. One end of the rear traction line is connected to the vehicle body, and the other end of the rear traction line is wound around the drum and connected to the end of the front traction line to form a closed loop. The middle part of the rear traction line is in contact with the second fixed pulley.

[0016] The beneficial effects of this invention are as follows: This invention features a compact and reasonable structure, and is easy to operate. A track is set at the bottom of the pool, and the vehicle body is slidably installed on the track to constrain the movement of the vehicle body. The movement (shortening) of the front traction line of the traction system drives the movement of the vehicle body, realizing the motion control of the underwater vehicle body sliding in a straight line underwater. A scimitar fixed to the vehicle body synchronously drives the underwater vehicle model to move in a fixed posture. The scimitar is located below the water surface to avoid directly interfering with the wake of the underwater vehicle model. This makes it suitable for underwater vehicle models in high angle of attack pitch / yaw conditions, meets the technical requirements of underwater vehicle wake characteristic tests, and ensures the reliability of test data.

[0017] Furthermore, the present invention also has the following advantages: (1) By rolling contact between the track with an arc-shaped guide surface and the roller with an arc-shaped rolling surface on the vehicle body, the vehicle body and the track are connected in a sliding manner, thereby achieving freedom restriction in addition to the above-mentioned linear direction of movement. It can resist the rolling moment, yaw moment and pitch moment generated by the model under the large angle of attack. Whether it is a single pitch angle / drift angle or a double angle superposition, it can provide stable support and motion guidance for the model, solving the problem of model instability and additional vibration under the large angle of attack of the traditional guide line traction method, and realizing the smooth linear dragging motion of the model.

[0018] (2) The track is fixedly connected to the bottom of the pool by suction cup assembly, without drilling holes to damage the bottom of the pool. It is suitable for the structure of the pool bottom such as glass that is fragile or cannot be damaged, and the track is installed without damage. It has strong adaptability to the bottom of the pool and greatly improves the applicability of the towing device.

[0019] (3) Each suction cup assembly is connected to the main pipeline of the vacuum pump through a branch pipeline. After the connection between each branch pipeline and the main pipeline is cut off by a valve, the pressure of the sealing cavity is detected by a pressure sensor. If the pressure does not meet the requirements, the sealing cavity can be evacuated again to ensure the good fixation of the track.

[0020] (4) The vehicle body and the track are both located at the bottom of the pool. The model of the vehicle is supported by the underwater streamlined spar on the vehicle body. This eliminates the traditional method of connecting the model with the surface trailer and completely eliminates the interference of the spar movement in the water surface area on the wake of the model. At the same time, the blocking effect of the streamlined spar and the horizontal cover plate greatly reduces the flow field disturbance caused by the movement of the towing device itself, ensuring the authenticity of the test flow field and effectively improving the data accuracy of the wake characteristic test.

[0021] (5) The gap is set as a vertical plane, and the lower surface of the cover plate is a slope that gradually rises from the center of the pool to both sides. This slope structure can effectively guide the microbubbles adsorbed on the lower surface of the cover plate to float up to the water surface quickly along the slope, avoiding the accumulation and retention of microbubbles in the test water. The end near the side wall of the pool is set as an arc transition section so that the microbubbles can escape in time after precipitation in the water, fundamentally eliminating the interference of microbubbles on the wake characteristics of the underwater model, and further improving the data accuracy and reliability of the wake test. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of the present invention (including the traction system).

[0024] Figure 3 for Figure 2 A sectional view of section AA in the middle.

[0025] Figure 4 for Figure 2 Sectional view of section BB.

[0026] Figure 5 This is a schematic diagram of the assembly structure of the track and the vehicle body in one embodiment of the present invention.

[0027] Figure 6 This is a front view of the assembly structure of the track and the vehicle body in one embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram (partial cross-section) of the track and related structures in one embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram of the vehicle body in one embodiment of the present invention.

[0030] Figure 9 This is a front view of the vehicle body in one embodiment of the present invention.

[0031] Figure 10 This is a schematic diagram of the assembly structure of the vacuum system and suction cup assembly in one embodiment of the present invention.

[0032] Figure 11 This is a schematic diagram of the suction cup assembly in one embodiment of the present invention.

[0033] Figure 12 This is a schematic diagram of the cover plate in one embodiment of the present invention.

[0034] in: 1. Model of the aircraft; 2. Sword shaft; 3. Vehicle body; 31. Front roller; 311. Roller body; 312. Axle; 313. Outer circumference; 32. Rear roller; 4. Traction system; 41. Front traction line; 42. Rear traction line; 43. First fixed pulley; 44. Drum; 45. Pulling mechanism; 46. Second fixed pulley; 5. Pool bottom; 6. Suction cup assembly; 601. Disc body; 602. Mounting base; 603. Threaded interface; 604. Pipe joint; 600. Sealing cavity; 7. Track; 71. Mounting bracket; 72. Guide surface; 8. Cover plate; 81. Gap; 82. Upper surface; 83. Lower surface; 831. Curved surface; 84. Support column; 9. Vacuum system; 91. Branch pipeline; 92. Main pipeline; 93. Pressure sensor; 94. Valve; 95. Vacuum pump. Detailed Implementation

[0035] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0036] Example 1: like Figure 1 As shown, the towing device for the wake test of the underwater vehicle model in this embodiment includes: a track 7, a vehicle body 3, a rapier 2, and a traction system 4.

[0037] Track 7 is fixedly installed at the bottom 5 of the pool where the wake test is conducted; The car body 3 is slidably mounted on the track 7, and the sliding direction of the car body 3 is a straight line. The lower end of the sword shaft 2 is fixedly connected to the vehicle body 3, and the upper end is used to connect to the aircraft model 1. The traction system 4 includes a front traction line 41, a first fixed pulley 43 disposed on the side wall of one end of the water tank in the sliding direction, and a traction mechanism 45 disposed outside the water tank. One end of the front traction line 41 is connected to the vehicle body 3, the middle part of the front traction line 41 is in contact with the first fixed pulley 43, and the other end of the front traction line 41 is connected to the traction mechanism 45 for transmission. The traction mechanism 45 is used to shorten the length of the front traction line 41, thereby driving the vehicle body 3 to slide.

[0038] Specifically, during the wake test, the vehicle body 3 moves in a straight line towards the first fixed pulley 43, which is the forward direction (e.g., Figure 1 , Figure 2 , Figure 5 (In the direction of the middle arrow), the straight line direction mentioned above is the length direction of the pool. The front traction line 41 is connected to the front end of the vehicle body 3 in the forward direction. There are two first fixed pulleys 43, which are set vertically on the side wall of the pool. The front traction line 41 is the line of the extended part between the traction mechanism 45 and the front end of the vehicle body 3. The traction mechanism 45 in the traction system 4 can be a winch. The front traction line 41 is driven to move by the winch winding the front traction line 41 (shortening the length of the front traction line 41).

[0039] In one specific implementation, the track 7 can be an I-beam structure, with two tracks arranged side by side on the bottom of the pool 5. The bottom of the vehicle body 3 is equipped with multiple rollers adapted to the track 7. The relative position between the vehicle body 3 and the track 7 is restricted from multiple directions by the rolling contact between the rollers and the track 7, so that the relative movement between the vehicle body 3 and the track 7 is only realized in the aforementioned straight direction.

[0040] Specifically, the rapier 2 is vertically fixed at the top center of the vehicle body 3. The cross-sectional profile of the rapier 2 is streamlined to reduce its impact on the water. The outer surface of the rapier 2 is polished smooth with high precision. Before conducting the wake test, according to the large pitch / drift angle required by the test, the vehicle model 1 is fixed to the top of the rapier 2. A special fixture is used to accurately adjust and fix the attitude of the vehicle model 1 to ensure that the model's attitude does not shift during the test.

[0041] A track 7 is set at the bottom 5 of the pool, and the vehicle body 3 is slidably installed on the track 7 to constrain the movement of the vehicle body 3. The movement (shortening) of the front traction line 41 of the traction system 4 drives the movement of the vehicle body 3, realizing the motion control of the underwater vehicle body 3 sliding in a straight line underwater. The scimitar 2 fixed on the vehicle body 3 synchronously drives the underwater vehicle model 1 to move in a fixed attitude. The scimitar 2 is located below the water surface to avoid directly interfering with the wake of the underwater vehicle model 1. This adapts the underwater vehicle model 1 to large angle of attack pitch / yaw conditions, meets the technical requirements of underwater vehicle wake characteristic test, and ensures the reliability of test data.

[0042] Example 2: Based on Example 1, the assembly structure of the vehicle body 3 and the track 7 is simplified, such as... Figures 2-9 As shown, in this embodiment, the towing device for the wake test of the underwater vehicle model has two tracks 7 arranged side by side, and the vehicle body 3 is located between the two tracks 7. A set of rollers is installed on each side of the vehicle body 3 in the horizontal direction perpendicular to the sliding direction. Each set of rollers includes a front roller 31 and a rear roller 32 rotatably mounted on the vehicle body 3. The front roller 31 and the rear roller 32 are arranged at intervals along the sliding direction. The track 7 is provided with guide surfaces 72, and the projections of each guide surface 72 in the sliding direction coincide and form a first arc; The front roller 31 and the rear roller 32 have the same structure. The front roller 31 includes a roller body 311. The outer peripheral surface 313 of the roller body 311 is a rotating surface centered on the axis of rotation 312 of the roller body 311. The generatrix of the outer peripheral surface 313 is the second arc. The projections of the first and second arcs in the sliding direction coincide, allowing the track 7 to slide with the vehicle body 3 while restricting the relative displacement between the track 7 and the vehicle body 3 in the direction perpendicular to the sliding direction.

[0043] Specifically, such as Figure 5 As shown, there are a total of four front rollers 31 and rear rollers 32, located at the vertices of a rectangle; the track 7, one front roller 31, another front roller 31, and the track 7 are arranged horizontally. The outer peripheral surfaces 313 on the two front rollers 31 are in line contact with the guide surfaces 72 on the track 7, and both are second arcs. The second arcs of the two outer peripheral surfaces 313 face opposite directions, respectively enclosing the guide surfaces 72 of one track 7. The same applies to the rear roller 32, so that the track 7 and the vehicle body 3 are slidably connected and their relative positions in the direction perpendicular to the sliding direction (including the horizontal and vertical directions) are restricted. At the same time, the vertical relative displacement between the track 7 and the vehicle body 3 is also restricted.

[0044] The two tracks 7 are kept at a certain distance. The tracks 7 limit the front roller 31 and the rear roller 32 in the horizontal / vertical direction, so that the tracks 7 and the vehicle body 3 provide reverse support force to balance the roll moment of the vehicle model 1. The front roller 31 and the rear roller 32 are kept at a certain distance. The front roller 31 and the rear roller 32 provide corresponding reverse support force to balance the large pitch moment and yaw moment generated by the vehicle model 1 when moving at a large pitch angle, so as to ensure the stability of the vehicle model 1 in the dual-angle movement state with pitch angle and drift angle.

[0045] By rolling contact between the track 7 with its arc-shaped guide surface 72 and the rollers with their arc-shaped rolling surfaces on the vehicle body 3, the vehicle body 3 and the track 7 are slidably connected. This achieves freedom of movement beyond the linear direction mentioned above, and can resist the rolling moment, yaw moment, and pitch moment generated by the model at large angles of attack. Whether it is a single pitch / drift angle or a combination of two angles, it can provide stable support and motion guidance for the model. This solves the problems of model instability and additional vibration at large angles of attack caused by traditional guideline traction methods, and achieves smooth linear towing motion of the model.

[0046] like Figure 6 As shown, the length of the first arc is greater than the length of the second arc to ensure a sufficiently large contact area and guarantee the supporting and limiting effect. The first and second arcs are axially symmetric, with the axis of symmetry in the horizontal direction.

[0047] The cross-section of track 7 is circular. Specifically, track 7 can be made of seamless steel tubing.

[0048] Example 3: like Figure 10 , Figure 11 As shown, based on the above embodiments, the towing device for the wake test of the underwater vehicle model in this embodiment also includes multiple suction cup assemblies 6 and a vacuum system 9.

[0049] Multiple suction cup assemblies 6 are fixedly connected to the track 7, and the disc body 601 of the suction cup assembly 6 forms a sealed cavity 600 with the bottom of the pool 5; The vacuum system 9, connected to each suction cup assembly 6, is used to extract air from the sealed cavity 600, so that the track 7 is fixedly connected to the bottom of the pool 5.

[0050] Specifically, the suction cup assembly 6 includes a disc body 601, which is made of silicone, pressure-resistant, and salt water corrosion-resistant. The upper part of the disc body 601 is a mounting base 602. A pipe connector 604 is provided on one side of the mounting base 602. The pipe connector 604 is connected to the vacuum system 9. A threaded interface 603 is provided on the mounting base 602. The threaded interface 603 is connected to the track 7 by fasteners.

[0051] The towing device of this embodiment is applicable to pool bottoms 5 made of glass or cement that can form a sealed cavity 600. The track 7 is fixed by suction cup assembly 6, so that the towing device can be used in situations where the pool bottom 5 cannot be damaged.

[0052] The track 7 is fixedly connected to the pool bottom 5 by suction cup assembly 6, without drilling or damaging the pool bottom 5. It is suitable for the structure of the pool bottom 5, such as glass, which is fragile or cannot be damaged, and allows for the installation of the track 7 without damage. The pool bottom 5 is highly adaptable, which greatly improves the applicability of the towing device.

[0053] like Figure 5 , Figure 6 As shown, the towing device also includes a frame structure mounting bracket 71, which is fixedly connected to the track 7, and the suction cup assembly 6 is fixedly mounted on the lower part of the mounting bracket 71.

[0054] Specifically, track 7 is a rod-shaped structure, and there are two tracks 7 arranged side by side. The number of suction cup components 6 depends on specific requirements, such as... Figure 5 , Figure 10 As shown, the suction cup assembly 6 is located at both ends of the mounting bracket 71 along the width of the pool.

[0055] The vacuum system 9 includes: main pipeline 92, vacuum pump 95, multiple branch pipelines 91, valves 94, and pressure sensor 93.

[0056] Vacuum pump 95 is connected to main pipeline 92; Multiple branch pipes 91 correspond one-to-one with suction cup assembly 6, and the branch pipes 91 connect the sealing cavity 600 to the main pipe 92. Valve 94 is located on branch pipe 91; Pressure sensor 93 is installed on branch pipe 91 and located between valve 94 and suction cup assembly 6, and is used to detect the pressure value in sealing cavity 600.

[0057] When installing the track 7 at the bottom of the pool 5, open the valve 94 on each branch pipe 91 and start the vacuum pump 95 to evacuate the sealing cavity 600 corresponding to each suction cup assembly 6 through the main pipe 92 and branch pipes 91. When the pressure in the sealing cavity 600 reaches the set value, close the valve 94 on each branch pipe 91 to complete the fixed connection between the track 7 and the bottom of the pool 5. Specifically, the valve 94 can be a one-way valve that automatically opens and closes during use. During the use of the towing device, the pressure inside the sealed cavity 600 is monitored by the control system of the towing device being electrically connected to the pressure sensor 93. When the pressure inside a certain sealed cavity 600 rises and does not meet the requirements, the vacuum pump 95 is used to evacuate the sealed cavity 600 until the pressure inside the sealed cavity 600 reaches the set value, ensuring that the suction cup assembly 6 is always tightly attached to the bottom of the pool 5, and achieving damage-free fixation of the track 7 to the bottom of the pool 5.

[0058] Each suction cup assembly 6 is connected to the main pipeline 92 of the vacuum pump 95 via a branch pipe 91. After the connection between each branch pipe 91 and the main pipeline 92 is cut off by the valve 94, the pressure sensor 93 is used to detect the pressure of the sealing cavity 600. If the pressure does not meet the requirements, the sealing cavity 600 can be evacuated again to ensure the good fixation of the track 7.

[0059] Example 4: like Figure 10 , Figure 11 As shown, based on the above embodiments, in order to reduce the impact of the underwater device on the wake test, the towing device for the wake test of the underwater vehicle model in this embodiment also includes two cover plates 8 spaced apart. The upper surface 82 of the cover plate 8 is a horizontal plane, and a gap 81 is formed between the two cover plates 8. The sword rod 2 is located in the gap 81, and the track 7 and the vehicle body 3 are located in the space formed by the two cover plates 8 and the bottom of the pool 5. The length direction of the gap 81 is consistent with the sliding direction, and the width of the gap 81 is adapted to the sword rod 2.

[0060] A cover plate 8 is laid at a set height above the vehicle body 3. The lower part of the cover plate 8 is fixedly connected to a support column 84 and supported on the bottom of the pool 5. The set height is such that the distance between the top of the vehicle body 3 and the lower surface 83 of the cover plate 8 is greater than or equal to 1.5 times the height of the vehicle body 3. The cover plate 8 is made of rigid and lightweight materials such as acrylic. The laying range of the cover plate 8 covers the movement area of ​​the vehicle body 3 and blocks the flow field disturbance generated by the movement of the vehicle body 3.

[0061] The cover plate 8 is placed above the vehicle body 3 at a set height. The cover plate 8 has a longitudinal gap 81 reserved along the length of the pool. The width of the gap 81 is adapted to the width of the streamlined rapier 2, so that the rapier 2 can pass through the gap 81 without interference when the vehicle body 3 moves. This can effectively block the flow field disturbance caused by the movement of the vehicle body 3, reduce the influence of the movement of the vehicle body 3 on the flow field around the floating body model 1, and ensure the authenticity of the test flow field.

[0062] Both the vehicle body 3 and the track 7 are located on the bottom of the pool 5. The floating model 1 is supported by the underwater streamlined scimitar 2 on the vehicle body 3, which abandons the traditional method of connecting the model with the surface trailer and completely eliminates the interference of the movement of the scimitar 2 in the water surface area on the wake of the floating model 1. At the same time, the blocking effect of the streamlined scimitar 2 and the horizontal cover plate 8 greatly reduces the flow field disturbance generated by the movement of the towing device itself, ensuring the authenticity of the test flow field and effectively improving the data accuracy of the wake characteristic test.

[0063] Furthermore, such as Figure 12 As shown, the lower surface 83 of the cover plate 8 is an inclined surface, and the lower surface 83 gradually rises from the gap 81 in the direction away from the gap 81. The side walls of the gap 81 are all vertical surfaces. The upper surface 82 extends to the front of the side wall of the pool along a direction perpendicular to the sliding direction. The end of the cover plate 8 facing the side wall of the pool is provided with an arc surface 831, which protrudes towards the side wall of the pool and transitions the lower surface 83 to the upper surface 82.

[0064] Specifically, the cover plate 8 can be constructed using a double-layer thin plate structure, with the upper thin plate set horizontally and the lower thin plate correspondingly arranged with a sloping angle.

[0065] The gap 81 is set as a vertical surface, and the lower surface 83 of the cover plate 8 is a slope that gradually rises from the center of the pool to both sides. This slope structure can effectively guide the microbubbles adsorbed on the lower surface 83 of the cover plate 8 to rise quickly to the water surface along the slope, avoiding the accumulation and retention of microbubbles in the test water. The end near the side wall of the pool is set as an arc transition section so that the microbubbles can escape in time after precipitation in the water, fundamentally eliminating the interference of microbubbles on the wake characteristics of the underwater model, and further improving the accuracy and reliability of the wake test data.

[0066] Example 5: like Figure 2 As shown, unlike the above embodiments, the traction system 4 for the wake test towing device of the underwater vehicle model in this embodiment also includes a rear traction line 42 and a second fixed pulley 46 set on the side wall of the other end of the sliding direction pool. The traction mechanism 45 is a motor, and a drum 44 is provided on the output shaft of the motor. One end of the rear traction line 42 is connected to the vehicle body 3, and the other end of the rear traction line 42 is wound on the drum 44 and connected to the end of the front traction line 41 to form a closed loop. The middle part of the rear traction line 42 is in contact with the second fixed pulley 46.

[0067] Specifically, there are two second fixed pulleys 46, which are set vertically on the side wall of the pool; the front traction line 41 and the rear traction line 42 are a single line. The front traction line 41 is the extended section of the line between the traction mechanism 45 and the front end of the vehicle body 3, and the rear traction line 42 is the extended section of the line between the traction mechanism 45 and the rear end of the vehicle body 3. During the movement of the vehicle body 3, both the front traction line 41 and the rear traction line 42 are in a taut state, realizing the dragging of the vehicle body 3 in two directions by the traction system 4, improving the operation convenience of the dragging device. After the test movement of the navigating model 1 in one direction is completed, the vehicle body 3 is moved to the initial position by the reverse rotation of the drive drum 44 driven by the motor.

[0068] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A towing device for wake testing of underwater vehicle models, characterized in that: include: The track (7) is fixedly installed at the bottom (5) of the pool where the wake test is conducted. The vehicle body (3) is slidably mounted on the track (7), and the sliding direction of the vehicle body (3) is a straight line; The lower end of the sword shaft (2) is fixed to the vehicle body (3), and the upper end is used to connect to the aircraft model (1). The traction system (4) includes a front traction line (41) and a first fixed pulley (43) set on the side wall of one end of the water tank in the sliding direction. A traction mechanism (45) is provided outside the water tank. One end of the front traction line (41) is connected to the vehicle body (3). The middle part of the front traction line (41) is in contact with the first fixed pulley (43). The other end of the front traction line (41) is connected to the traction mechanism (45) in a transmission manner. The traction mechanism (45) is used to shorten the length of the front traction line (41) and thus drive the vehicle body (3) to slide.

2. The towing device for wake testing of underwater vehicle models as described in claim 1, characterized in that: The number of tracks (7) is two and they are arranged side by side, and the vehicle body (3) is located between the two tracks (7); A set of rollers is installed on both sides of the vehicle body (3) in the horizontal direction perpendicular to the sliding direction. Each set of rollers includes a front roller (31) and a rear roller (32) rotatably mounted on the vehicle body (3). The front roller (31) and the rear roller (32) are arranged at intervals along the sliding direction. The track (7) is provided with guide surfaces (72), and each guide surface (72) is projected in the sliding direction and is a first arc; The front roller (31) and the rear roller (32) have the same structure. The front roller (31) includes a roller body (311). The outer peripheral surface (313) of the roller body (311) is a rotating surface centered on the axis of rotation (312) of the roller body (311). The generatrix of the outer peripheral surface (313) is a second arc. The projections of the first arc and the second arc in the sliding direction coincide, so that the track (7) and the vehicle body (3) are slidably connected while the relative displacement of the track (7) and the vehicle body (3) in the direction perpendicular to the sliding direction is restricted.

3. The towing device for wake testing of underwater vehicle models as described in claim 2, characterized in that: The length of the first arc is greater than the length of the second arc.

4. The towing device for wake testing of underwater vehicle models as described in claim 2, characterized in that: The cross-section of the track (7) is circular.

5. The towing device for wake testing of underwater vehicle models as described in claim 1, characterized in that: The towing device also includes: Multiple suction cup assemblies (6) are fixedly connected to the track (7), and the disc body (601) of the suction cup assembly (6) forms a sealed cavity (600) with the bottom of the pool (5). A vacuum system (9), connected to each suction cup assembly (6), is used to extract air from the sealed cavity (600) so that the track (7) is fixedly connected to the bottom of the pool (5).

6. The towing device for wake testing of underwater vehicle models as described in claim 5, characterized in that: The towing device also includes a frame structure mounting bracket (71), which is fixedly connected to the track (7), and the suction cup assembly (6) is fixedly mounted on the lower part of the mounting bracket (71).

7. The towing device for wake testing of underwater vehicle models as described in claim 5, characterized in that: The vacuum system (9) includes: Supervisor Road (92); A vacuum pump (95) is connected to the main pipeline (92); Multiple branch pipes (91) correspond one-to-one with the suction cup assembly (6), and the branch pipes (91) connect the sealing cavity (600) to the main pipe (92); A valve (94) is installed on the branch pipe (91); A pressure sensor (93) is installed on the branch pipe (91) and located between the valve (94) and the suction cup assembly (6) to detect the pressure value in the sealing cavity (600).

8. The towing device for wake testing of underwater vehicle models as described in claim 1, characterized in that: The towing device also includes two cover plates (8) spaced apart. The upper surface (82) of the cover plate (8) is horizontal. A gap (81) is formed between the two cover plates (8). The sword rod (2) is located in the gap (81). The track (7) and the vehicle body (3) are located in the space formed by the two cover plates (8) and the bottom of the pool (5). The length direction of the gap (81) is consistent with the sliding direction. The width of the gap (81) is adapted to the sword rod (2).

9. The towing device for wake testing of underwater vehicle models as described in claim 8, characterized in that: The lower surface (83) of the cover plate (8) is an inclined surface, and the lower surface (83) gradually rises from the gap (81) in a direction away from the gap (81). The side walls of the gap (81) are all vertical surfaces. The upper surface (82) extends to the front of the side wall of the pool in a direction perpendicular to the sliding direction. The end of the cover plate (8) facing the side wall of the pool is provided with an arc surface (831). The arc surface (831) protrudes towards the side wall of the pool and transitions the lower surface (83) to the upper surface (82).

10. The towing device for wake testing of an underwater vehicle model as described in claim 1, characterized in that: The traction system (4) also includes a rear traction line (42) and a second fixed pulley (46) set on the side wall of the other end of the sliding direction pool. The traction mechanism (45) is a motor. A drum (44) is provided on the output shaft of the motor. One end of the rear traction line (42) is connected to the vehicle body (3). The other end of the rear traction line (42) is wound around the drum (44) and connected to the end of the front traction line (41) to form a closed loop. The middle part of the rear traction line (42) is in contact with the second fixed pulley (46).

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