A lateral drift stabilizer for small towed systems

Abstract

The application discloses a transverse drift stabilizer applied to a small towing system, which comprises a towing main body, a towing tail plate and streamlined stabilizers, the towing main body and the towing tail plate are connected through a shaft to form a basic towing system, and the towing main body is connected with the streamlined stabilizers on both sides respectively, and the towing tail plate can swing up and down during operation. The transverse drift stabilizer has simple structure and can self-adaptively maintain the stability of transverse movement in the marine environment with transverse disturbance.

Description

TECHNICAL FIELD

[0001] The present application relates to a lateral drift stabilizer applied to a small towing system. BACKGROUND

[0002] The unmanned vehicle drives the towed body to measure the temperature, salinity and depth of the ocean longitudinal interface, which is an important means to realize real-time high-precision measurement in the region with severe spatial and temporal changes of physical parameters. However, due to the relatively small mass of the unmanned vehicle, if it is suddenly subjected to a lateral force during measurement, the unmanned vehicle is difficult to maintain balance, and even the possibility of overturning may occur. On the other hand, in order to ensure the measurement accuracy of the sensor, the running stability of the entire system is crucial, and therefore the towed body is required to have the ability to resist the lateral disturbance of the ocean environment. The randomness of the lateral disturbance of the ocean environment makes it very difficult to achieve the lateral motion stability of the towed body by using active control method, and moreover, the active control method requires a special control system and additional energy input, which brings additional load burden to the unmanned vehicle.

[0003] The towing system carried by the unmanned vehicle mainly consists of a towing cable, a towed body and a sensor, and is an important equipment for realizing mobile detection of ocean physics and ocean geology. Since the unmanned vehicle itself has a small mass and can exert a small towing force, the towed body must be lightweight and small in size. However, the lightweight and small size of the towed body brings a serious problem, that is, when the towed body follows the unmanned vehicle to realize longitudinal motion, it is easily affected by external ocean environment and appears lateral unstable motion, which affects the normal work of the transmission equipment on the one hand, and on the other hand, the lateral unstable hydrodynamic force generated thereby is transmitted to the unmanned vehicle, which may greatly lead to uncontrollable motion of the unmanned vehicle.

[0004] The Danish EIVA company ScanFish series ROTV underwater towing survey system device has a similar stabilizer scheme. Since the underwater survey system device has a relatively large size and is towed by a large ship, the requirement for the lateral motion stability of the towed body is relatively low, and therefore the stabilizers on both sides of the towed body are flat plates.

[0005] From the perspective of fluid mechanics, when the flat plate moves at a very small angle of attack, separation flow and vortex will appear on the back surface of the flat plate. Such separation flow and vortex are generally non-stationary, and with the lateral disturbance brought by the environment, they have a negative impact on the stability of the towed body. The installation of flat plate stabilizers on both sides of the towed body can make the towed body return to the equilibrium position. For large towing systems and large towing ships, the negative impact of lateral disturbance is relatively small. However, for unmanned vehicles and small towing systems, the impact cannot be ignored. SUMMARY

[0006] In order to solve the problems existing in the prior art, the present application provides a lateral drift stabilizer applied to a small towing system.

[0007] The application can be realized by the following technical solutions:

[0008] A lateral drift stabilizer applied to a small towing system, comprising a towing main body, a towing tail plate, and a streamlined stabilizer, the towing main body and the towing tail plate are connected by a shaft to form a basic towing system, and the two sides of the towing main body are connected with the streamlined stabilizer respectively, and the towing tail plate can swing up and down during operation.

[0009] Further, the towing tail plate is divided into three parts and can swing up and down along the shaft, wherein the middle plate is fixed with the towing main body, and the two side plates swing in the same direction at the same time.

[0010] Further, the towing main body adopts a streamlined design, which can reduce the fluid resistance of the system during movement, and this design is particularly useful for towing systems that need to operate with a long stroke.

[0011] Further, the streamlined stabilizer is in the shape of an airfoil.

[0012] Further, the two sides of the towing main body are connected with the streamlined stabilizer by screws respectively.

[0013] Further, the streamlined stabilizer is based on the NACA airfoil and imitates fish scales, and is made of flexible material to produce corresponding movement as the towing system advances underwater. The streamlined stabilizer can help the towing system obtain additional buoyancy in water, which helps it maintain balance and float in water.

[0014] The application has the following beneficial effects:

[0015] Miniaturization: The miniaturized design of the application makes the towing system more flexible and portable, which can be applied to unmanned aerial vehicles, unmanned ships and other fields, improving the efficiency and accuracy of task execution.

[0016] Stability: The stabilizing device design of the application can keep the array cable straight, balance the lateral force, reduce the heaving motion of the towing body during operation, and avoid separation flow and vortex during movement by designing the airfoil structure, thereby improving the stability and balance of the towing system during movement. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the application;

[0018] Figure 2 is an exploded view of the structure of the application;

[0019] Figure 3 is a calculation flowchart of the application.

[0020] Figure 1 - streamlined stabilizer; 2 - screw; 3 - towing body; 4 - shaft; 5 - towing tail plate; 6 - washer. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present application through specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure.

[0022] As Figure 1 shown in FIG. 2, a lateral drift stabilizer applied to a small towing system of the present application includes a streamlined towing body 3, a towing tail plate 5, a streamlined stabilizer 1, and the streamlined towing body 3 and the towing tail plate 5 are connected through a shaft 4 to form a basic towing system. The towing tail plate 5 is divided into three parts and can swing up and down along the shaft 4, among which the middle plate is fixed with the towing body 3, and the two side plates swing in the same direction at the same time. In the working process, the towing tail plate 5 can swing up and down, and the streamlined stabilizer 1 and the towing body 3 are connected through the screw 2 after the screw 2 and the washer 6 are matched with each other. Among them, the streamlined stabilizer 1 is based on the NACA airfoil and designed like fish scales at the same time, and is made of flexible material to produce corresponding movement with the towing system advancing underwater. The streamlined stabilizer can help the towing system obtain additional buoyancy in water, which helps to maintain balance and float in water.

[0023] The following describes the numerical simulation of the towing system with the stabilizer by the flow chart shown in FIG. 3. Figure 3

[0024] The passive stabilizer designed in the present application is applied to a small towing system on an unmanned ship, which can adaptively maintain the stability of the lateral movement in the ocean environment with lateral disturbance, and has good drag reduction effect.

[0025] The CFD calculation results show that the passive stabilizer has good flow effect. In the process of advancing underwater, when the system is subjected to a lateral force from the left (right), it will rotate clockwise (counterclockwise), at this time the stabilizer is subjected to the corresponding fluid power, the shape of the airfoil changes the fluid velocity around the airfoil, according to Bernoulli formula (1), the change of velocity causes the change of pressure around the airfoil, which will generate a right (left) lateral force accordingly, ensuring that there is no large flow force and separation vortex, so that the towing system returns to the original lateral balance position. At the same time of balancing the lateral force, the rectangular body adopted has large heave motion damping, which can reduce the heave motion of the towing body in the working process, which is beneficial to the motion stability of the towing body.

[0026] ​

[0027] In this formula, represents pressure, represents density, represents velocity.

[0028] Meanwhile, the airfoil stabilizer has a higher lift-drag ratio, can generate larger lift, and keeps a relatively stable lift characteristic within a certain angle of attack range.

[0029] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A roll stabilizer for application to a small towing system, characterized in that, The utility model relates to a kind of underwater vehicle, including drag main body, drag tail plate, streamline stabilizer, the drag main body is connected with drag tail plate by shaft to form basic drag system, the drag main body two sides are connected with the streamline stabilizer respectively, when working, the drag tail plate can swing up and down; The drag tail plate is divided into 3 blocks, and can swing up and down along the shaft, wherein the middle one is fixed with the drag main body, and the two on the side swing in the same direction at the same time.

2. A roll stabilizer for a small towing system according to claim 1, characterized in that The drag main body adopts streamline design.

3. A roll stabilizer for a small towed system according to claim 1, characterized in that, The streamline stabilizer is airfoil type.

4. A roll stabilizer for a small towed system according to claim 1, characterized in that, The drag main body two sides are connected with the streamline stabilizer by screw respectively.

5. A roll stabilizer for a small towing system according to claim 1, characterized in that, The streamline stabilizer is based on NACA airfoil, and is designed like fish scale at the same time, made of flexible material, and generates corresponding movement with the drag system advancing underwater.

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