A connection and support device for underwater glider towing test model

Abstract

The invention discloses a connection and support device for an underwater glider towing test model, which belongs to the field of hydrodynamic tests; it includes a balance connecting rod, a variable angle of attack inclined plane and a balance fixing plate; the trailer is connected to the variable angle of attack inclined plane through the balance connecting rod; the balance is fixed between the variable angle of attack inclined plane and the test model through the balance fixing plate; the power is transmitted through the rigid connection between each other to achieve synchronization between the model speed and the trailer speed; the balance connecting rod is provided with a deflector, and the fluid resistance encountered during the test is reduced by the structure, so as to reduce the deflection of the entire device caused by the large span during the test; the angle of attack under different working conditions is achieved by adopting variable angle of attack inclined planes of different angles. The model is fixedly connected to the trailer through the connection and support device of the invention, and the speed is synchronized with the trailer, so that towing tests under various speed conditions can be carried out, which meets the technical requirements of the towing tank test and improves the accuracy of the test.

Description

Technical Field

[0001] The invention belongs to the field of hydrodynamics tests, and in particular relates to a connection and support device for an underwater glider towing test model. Background Art

[0002] Underwater gliders are a new type of underwater carrier platform. Compared with traditional underwater vehicles, they do not rely on the thrust generated by propellers to move forward, but rely on changing their own buoyancy and attitude angle to achieve zigzag gliding in the ocean. They have the advantages of low cost, long range and good concealment, and are currently used in many fields. In recent years, as my country's "maritime power" strategy continues to advance into the deep sea, improving the range and endurance of underwater gliders has become a difficult "hard bone" that hinders the breakthrough of its key technologies. Compared with traditional rotating body underwater gliders, new underwater gliders using wing-body fusion technology have attracted great attention. They have the advantages of high lift-to-drag ratio, high glide ratio and the ability to carry more airborne equipment.

[0003] In the design process of this underwater glider, numerical simulation is an extremely important means, but the authenticity and accuracy of the numerical simulation results always need to be verified by relevant experiments. The towing tank can monitor the test data in real time and provide a good environment for conducting related experiments.

[0004] When the wing-body fusion underwater glider is tested in the towing tank, it is necessary to meet certain similarity criteria due to the use of a scaled model. In order to achieve the requirements of the model's movement speed and mass in the similarity criteria and provide the model without its own power device with the speed required by the test condition, the model needs to be connected to an external trailer. At the same time, the test model can be weighted differently according to different speed conditions and the stability of the model during the test can be ensured. More importantly, in order to simulate the flow field in which the actual object is operated, the interference of the connection device on the external flow field of the model must be reduced. Therefore, designing a fixed support structure for the towing tank test model that can simultaneously meet the above requirements is of great significance for the towing test of underwater gliders.

[0005] A connection device is disclosed in the prior art. The connection device mainly relies on a cable composed of a high-strength rope and an electric cable. One end of the cable is connected to an underwater power-generating kite, and the other end is connected to an anchor column at the bottom of a trailer to tow the underwater kite. The high-strength rope bears the tension generated by the underwater power-generating kite and transmits the power required for its movement. The cable transmits the electric energy generated by the generator of the underwater power-generating kite, and transmits the control model between the controller and the underwater power-generating kite, so that it can use its own rudder to correct the motion posture. The device can be used for towing tank tests, but the flexible connection is difficult to ensure that the motion posture required by the tester is maintained during the test for an underwater glider model without any power device. The rigid connection device disclosed in the prior art mainly includes a mounting bracket, a circular pipe and a trailer side bridge, which can be used for towing tank tests of seaplane models. However, for test models that need to be fully immersed in the test, the connection device has a large disturbance to the external flow field of the model, and cannot simulate the real external environment of the real object during operation. Summary of the invention

[0006] Technical issues to be solved:

[0007] In order to avoid the shortcomings of the prior art, the present invention provides a connection and support device for an underwater glider towing test model, including a balance connecting rod, a variable angle of attack inclined plane, an upper fixed plate of a balance and a lower fixed plate of a balance. The balance connecting rod is connected to the trailer by screws, the variable angle of attack inclined plane is connected to the balance connecting rod by screws, the upper fixed plate of the balance is connected to the variable angle of attack inclined plane by screws, and the lower body of the model is connected to the lower fixed plate of the balance by screws. Among them, the variable angle of attack inclined plane and the balance connecting rod are positioned by locating pins, the upper fixed plate of the balance and the variable angle of attack inclined plane are fixed by locating pins, and the lower body of the model and the lower fixed plate of the balance are positioned by locating pins. The technical requirements of the towing tank test are met, and the accuracy of the test is improved.

[0008] The technical solution of the present invention is: a connection and support device for an underwater glider towing test model, comprising a balance connecting rod, a variable angle of attack inclined plane and a balance fixing plate, wherein a trailer is connected to the variable angle of attack inclined plane through the balance connecting rod, and a balance is fixed between the variable angle of attack inclined plane and the test model through the balance fixing plate, and power is transmitted through the rigid connection between the two to achieve synchronization of the model speed and the trailer speed;

[0009] The balance connecting rod is provided with a flow guide cover, through which the fluid resistance encountered during the test is reduced, and the deflection of the entire device caused by the large span during the test is reduced;

[0010] The angle of attack under different working conditions is achieved by adopting variable angle of attack inclined planes of different angles.

[0011] A further technical solution of the present invention is: a central through hole is opened in the air deflector of the balance connecting rod along the span direction, and connecting flanges are arranged at both ends, namely an upper flange and a lower flange; the central through hole serves as a wiring channel; the upper flange is fixedly connected to the trailer, and the lower flange is fixedly connected to one side end face of the variable attack angle inclined surface.

[0012] A further technical solution of the present invention is that the deflector adopts a NACA airfoil structure to reduce the disturbance of the balance connecting rod to the external flow field of the model during the test.

[0013] A further technical solution of the present invention is that the variable attack angle inclined surface is a double-layer disc structure, the upper layer is fixedly connected to the lower flange of the balance connecting rod by positioning pins and screws, and the lower layer is fixedly connected to the balance fixing plate by positioning pins and screws.

[0014] A further technical solution of the present invention is that the top surface of the upper layer of the variable attack angle inclined surface is an inclined surface, and the angle between the upper layer top surface and the lower layer bottom surface is the attack angle.

[0015] A further technical solution of the present invention is that a notch is provided on the upper end surface of the variable attack angle inclined surface, and the test cable passes through the notch and enters the central through hole of the balance connecting rod.

[0016] A further technical solution of the present invention is that the upper diameter of the variable attack angle inclined surface is smaller than the lower diameter.

[0017] A further technical solution of the present invention is: the balance fixing plate includes an upper balance fixing plate and a lower balance fixing plate; the upper end of the balance is fixedly connected to the variable attack angle inclined surface through the upper balance fixing plate, and the lower end thereof is connected to the test model through the lower balance fixing plate.

[0018] A further technical solution of the present invention is: the fixed plate on the balance is a disc-shaped structure, and a corresponding threaded hole and a positioning pin hole are opened in the middle position of its end surface according to the position of the thread and hole of the balance, so as to facilitate the positioning and fixing of the balance; threaded holes and positioning pin holes are opened around the end surface according to the connection requirements of the variable attack angle inclined surface, so as to achieve the stability of the connection between the fixed plate on the balance and the variable attack angle inclined surface.

[0019] A further technical solution of the present invention is: the lower fixed plate of the balance is a rectangular sheet structure, a circular boss is provided in the middle of its end face, and corresponding threaded holes and positioning pin holes are opened according to the positions of the threads and holes of the balance to achieve the positioning and connection of the balance; threaded holes and positioning pin holes are opened on both sides of its end face near the short sides of the rectangle to achieve the positioning and connection of the lower fixed plate of the balance and the lower body of the model.

[0020] The specific implementation process is as follows: the balance rod includes an upper flange, a fairing, and a lower flange. The lower surface of the upper flange is welded and fixedly connected to the upper surface of the fairing with an airfoil, the upper flange is fixedly connected to the trailer through the upper flange fixing screws, the lower surface of the other end of the fairing is fixedly connected to the upper surface of the lower flange through welding, the lower flange is fixedly connected to the variable angle of attack inclined plane through the lower flange fixing screws, and is positioned through two balance rod positioning pins, thereby realizing the rigid connection between the balance rod and the trailer and ensuring the correctness of the fairing orientation, thereby reducing the disturbance of the connection structure to the external flow field of the model, and more realistically simulating the external environment during the actual operation. The variable angle of attack inclined plane is a double-layer disc structure, the top layer of which is connected to the lower flange through the lower flange fixing screws and the balance rod positioning pins, and has a notch, through which the test cable passes, enters the center through hole of the balance rod, and is then connected to the switchboard, avoiding the exposure of the line during the test, and realizing the real-time monitoring of the test data by the test personnel. The bottom layer of the variable angle of attack inclined plane is provided with threaded holes and positioning pin holes along the circumference, so as to realize the stable positioning and connection between the variable angle of attack inclined plane and the upper fixed plate of the balance and ensure the accuracy of the orientation of the notch position to ensure the center position. The upper fixed plate of the balance and the lower fixed plate of the balance form the fixed plate of the balance. The upper fixed plate of the balance is a disc-shaped structure, and the middle position is provided with corresponding threaded holes and positioning pin holes according to the position of the threads and holes of the balance, so as to facilitate the positioning and fixing of the balance. The surrounding positions are provided with threaded holes and positioning pin holes according to the connection requirements of the variable angle of attack inclined plane, so as to realize the stability of the connection with the variable angle of attack inclined plane and meet the needs of changing the angle of attack in the test conditions. The lower fixed plate of the balance is a rectangular sheet structure, and the middle position is a circular boss, and the corresponding threaded holes and positioning pin holes and positioning pin holes are provided according to the position of the threads and holes of the balance, so as to realize the positioning and connection of the balance. Threaded holes and positioning pin holes are opened on both sides near the short sides of the rectangle to realize the positioning and connection between the lower fixing plate of the balance and the lower body of the model. In this way, the fixing plate of the balance clamps the balance from top to bottom, indirectly increasing the contact area between the balance and the model, enhancing the stability of the connection of the measuring device, thereby reducing the fluctuation of the test data caused by installation problems, improving the accuracy of the test measurement, and reducing the wear of the threads of the balance caused by disassembling and assembling the model during repeated tests. At the same time, in order to achieve the requirements for model quality in the similarity criterion, under the constraint of not weakening the strength of the lower fixing plate of the balance, corresponding weight reduction grooves are evenly opened on it to achieve the weight balance of the model.

[0021] Beneficial Effects

[0022] The beneficial effects of the present invention are as follows: the model is fixedly connected to the trailer by using the connection and support device of the present invention, and the speed is synchronized with the trailer, so that the towing test under various speed conditions can be carried out; the deflector plays a role in guiding the external flow field, and its structural shape adopts the NACA0012 airfoil, and the resistance it encounters in water can be reduced by 20% to 30% compared with a general cylinder, thereby reducing the fluid resistance encountered by the structure during the test, improving the accuracy of the test result, and overcoming the problems of insufficient rigidity and poor stability of the connection structure due to the long span; the angle of attack under different working conditions is achieved by adopting variable angle of attack inclined planes of different angles.

[0023] The connection and support device is connected to the middle part of the model, which reduces the influence of the additional torque brought by the test on the model, making the measurement result more real and accurate; the cable is directly connected to the host, which can realize the real-time monitoring of the data by the test personnel, and ensure the convenience and safety of the test; the balance is connected to the experimental model through the balance fixing plate, which indirectly increases the contact area between the measuring device and the model, reduces the wear of the thread of the balance caused by repeated disassembly and assembly of the model during the test, and uses its own structure to perform different weightings on the model. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure;

[0025] Figure 2 It is a schematic diagram of the balance rod structure;

[0026] Figure 3 It is a schematic diagram of the variable attack angle inclined plane structure;

[0027] Figure 4 It is a schematic diagram of the structure of the fixed plate on the balance;

[0028] Figure 5 It is a schematic diagram of the balance structure;

[0029] Figure 6 It is a schematic diagram of the structure of the lower fixed plate of the balance;

[0030] Explanation of the accompanying drawings: 1—balance connecting rod, 2—variable attack angle inclined plane, 3—balance upper fixing plate, 4—balance lower fixing plate, 5—balance connecting rod locating pin, 6—lower flange fixing screw, 7—variable attack angle inclined plane locating pin, 8—variable attack angle inclined plane fixing screw, 9—balance, 10—balance lower fixing plate locating pin, 11—balance lower fixing plate fixing screw, 12—upper flange, 13—air deflector, 14—lower flange, 15—balance small locating pin, 16—balance large locating pin. DETAILED DESCRIPTION

[0031] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] like Figure 1-6 As shown, the present embodiment is a threaded connection type fixing and supporting structure of a towing pool, which includes an upper flange 12, an upper flange fixing screw, a deflector 13, a lower flange 14, a lower flange fixing screw 6, a balance connecting rod positioning pin 5, a variable attack angle inclined plane 2, a variable attack angle inclined plane fixing screw 8, a variable attack angle inclined plane positioning pin 7, a balance upper fixing plate 3, a balance fixing screw, a balance small positioning pin 15, a balance lower fixing plate 4, a balance large positioning pin 16, a balance lower fixing plate fixing screw 11 and a balance lower fixing plate positioning pin 10. The upper flange 12 is fixedly connected to the deflector 13 by welding, and the deflector 13 is fixedly connected to the lower flange 14 by welding. The lower flange 14 is fixedly connected to the variable attack angle inclined plane 2 by 6 lower flange fixing screws 6. The variable attack angle inclined plane 2 is connected to the balance upper fixing plate 3 by 6 variable attack angle inclined plane fixing screws 8. The balance upper fixing plate 3 is fixedly connected to the balance 9 by 4 balance fixing screws. The balance 9 is connected to the balance lower fixing plate 4 through 4 balance fixing screws. The balance lower fixing plate 4 is fixedly connected to the model lower body through 6 balance lower fixing plate fixing screws 11.

[0034] The installation and use process of the present invention will be described below in conjunction with the accompanying drawings.

[0035] According to the test requirements, the balance 9 and the lower fixed plate 4 of the balance are first positioned by a large balance positioning pin 16 and a small balance positioning pin 15, and then four balance fixing screws are tightened in sequence along the diagonal line to ensure that the balance 9 is in the center of the lower fixed plate 4 of the balance. The lower body of the model is placed upward and fixed, and the lower fixed plate 4 of the balance is positioned with the lower body of the model using two lower fixed plate positioning pins 10, and six lower fixed plate fixing screws 11 are used to fix them in sequence along the diagonal line. At this time, the upper fixed plate 3 of the balance and the balance 9 are positioned by two small balance positioning pins 15, and four balance fixing screws are tightened in sequence along the diagonal line to fix them. Next, the variable angle of attack inclined plane is positioned with the upper fixed plate 3 of the balance through two variable angle of attack inclined plane positioning pins 7 to ensure the direction of the notch on it, and six variable angle of attack inclined plane fixing screws 8 are used to tighten and connect in sequence along the diagonal line, and the cable carried by the balance 9 enters the central through hole of the balance connecting rod through the notch carried by the variable angle of attack inclined plane 2. Then, the balance connecting rod 1 and the variable angle of attack inclined plane 2 are positioned with two balance connecting rod positioning pins 5 to ensure the accuracy of the direction of the deflector 13, and six lower flange fixing screws are used to tighten and connect in sequence along the diagonal line. Finally, the balance connecting rod 1 is tightened and connected to the trailer through six upper flange fixing screws in sequence along the diagonal line to achieve the connection of the model as a whole with the trailer to achieve speed synchronization. Due to the simple structure, few parts, and uncomplicated installation process, the time for installing and disassembling the model during repeated tests is shortened, and subsequent repair and maintenance are also more convenient, which can better ensure the stability of the model during towing and the accuracy of the test data, and plays a very important role in the verification of key technologies in the development process of underwater gliders.

[0036] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A connection and support device for an underwater glider towing test model, characterized in that: It includes a balance connecting rod, a variable angle of attack inclined plane and a balance fixing plate. The trailer is connected to the variable angle of attack inclined plane through the balance connecting rod. The balance is fixed between the variable angle of attack inclined plane and the test model through the balance fixing plate. The power is transmitted through the rigid connection between them to achieve synchronization of the model speed and the trailer speed. The balance connecting rod is provided with a deflector, which reduces the fluid resistance encountered during the test and is used to reduce the deflection of the entire device caused by the large span during the test; the deflector of the balance connecting rod is provided with a central through hole along the span direction, and connecting flanges are provided at both ends, namely an upper flange and a lower flange; the central through hole serves as a wiring channel; the upper flange is fixedly connected to the trailer, and the lower flange is fixedly connected to one side end face of the variable angle of attack inclined surface; the deflector adopts a NACA airfoil structure, which is used to reduce the disturbance of the balance connecting rod to the external flow field of the model during the test; The angle of attack under different working conditions is achieved by adopting variable angle of attack inclined planes of different angles; the variable angle of attack inclined plane is a double-layer disc structure, the upper layer is fixedly connected to the lower flange of the balance connecting rod by positioning pins and screws, and the lower layer is fixedly connected to the balance fixing plate by positioning pins and screws; the top surface of the upper layer of the variable angle of attack inclined plane is an inclined surface, and the angle between the upper layer and the bottom surface of the lower layer is the angle of attack; a notch is provided on the upper layer end surface of the variable angle of attack inclined plane, and the test cable enters the central through hole of the balance connecting rod after passing through the notch; the upper layer diameter of the variable angle of attack inclined plane is smaller than the lower layer diameter; The balance fixing plate comprises a balance upper fixing plate and a balance lower fixing plate; the upper end of the balance is fixedly connected to the variable attack angle inclined plane through the balance upper fixing plate, and the lower end thereof is connected to the test model through the balance lower fixing plate; the balance upper fixing plate is a disc-shaped structure, and a corresponding threaded hole and a positioning pin hole are opened in the middle position of its end face according to the position of the thread and hole of the balance, so as to facilitate the positioning and fixing of the balance; threaded holes and positioning pin holes are opened at the positions around its end face according to the connection requirements of the variable attack angle inclined plane, so as to achieve the stability of the connection between the balance upper fixing plate and the variable attack angle inclined plane; the balance lower fixing plate is a rectangular sheet-shaped structure, and a circular boss is provided in the middle part of its end face, and corresponding threaded holes and positioning pin holes are opened according to the position of the thread and hole of the balance, so as to achieve the positioning and connection of the balance; threaded holes and positioning pin holes are opened on both sides of its end face near the short sides of the rectangle, so as to achieve the positioning and connection of the balance lower fixing plate and the lower body of the model.

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