A protection device for a drum-type wind tunnel test model and its usage method

Abstract

The present invention provides a protection device for a drum-type wind tunnel test model and a method for using the same, which includes a support rod, a fixed seat, two brake pads, a conical expansion device, and a linear traction mechanism. The fixed seat is fixed on the outer side of the support rod. The two brake pads are symmetrically arranged and rotatably connected to the fixed seat. The conical expansion device is located between the end heads of the automatic ends of the two brake pads. The conical expansion device is connected to the linear traction mechanism, and the conical expansion device makes a linear reciprocating motion driven by the linear traction mechanism. The movement of the conical expansion device drives the two brake pads to approach or move away from each other. The structure of the present invention is compact and is easy to be installed inside the test model. The operation of the protection mechanism is realized by providing driving power through the linear traction mechanism. The linear traction mechanism can be installed outside the wind tunnel, saving the space of the wind tunnel test section.

Description

Technical Field

[0001] The present invention relates to the technical field of wind tunnel test protection, and particularly relates to a drum-type wind tunnel test model protection device and a using method thereof. Background Art

[0002] During a wind tunnel test, the rapid change of the flow field in the test section when the vehicle is switched on and off causes the test model to vibrate violently, or the test model flutters when the flutter boundary is reached during the test process. These situations may cause serious damage to the test model, and a protection device is required to suppress the vibration of the test model.

[0003] Currently, the protection devices for wind tunnel tests are divided into two types. One is to isolate the flow field from the test model. This type of protection device is usually installed outside the test model at the upstream position of the flow field. Such a device will occupy a large space in the test section and have a great impact on the design of the test model.

[0004] The other is installed inside the test model and achieves the purpose of protection by directly contacting the test model for braking. Such a device usually directly drives the braking components by using motors, cylinders, etc. However, the mechanisms such as motors and cylinders need to be installed inside the strut to realize the operation of the protection mechanism, which will also occupy a large space in the wind tunnel test section. Summary of the Invention

[0005] The purpose of the present invention is to provide a drum-type wind tunnel test model protection device and a using method thereof, which are structurally compact, easy to install inside the test model, and save the space in the wind tunnel test section.

[0006] According to an object of the present invention, a drum-type wind tunnel test model protection device is provided, which includes a strut, a fixed seat, two brake pads, a conical expansion device, and a linear traction mechanism. The fixed seat is fixed on the outside of the strut. The two brake pads are symmetrically arranged and rotatably connected to the fixed seat. The conical expansion device is located between the end heads of the automatic ends of the two brake pads. The conical expansion device is connected to the linear traction mechanism, and the conical expansion device makes a linear reciprocating motion driven by the linear traction mechanism, and drives the two brake pads to approach or move away from each other through the movement of the conical expansion device.

[0007] Further, a test model is provided on the outside of the strut, and the brake pads are located inside the test model.

[0008] Further, the conical expansion device includes a guide rail, a slider, and a support cone. The guide rail is fixed on one side of the fixed seat. The slider is slidably arranged on the guide rail, and the slider can freely slide on the guide rail. The support cone is fixedly installed at the end head of the slider, and the support cone is located between the end heads of the two brake pads.

[0009] Furthermore, a traction seat is fixed on the fixed seat, and the linear traction mechanism is fixed on the traction seat.

[0010] Furthermore, the linear traction mechanism is fixedly connected to the slider via a traction rod.

[0011] Furthermore, the support cone is located at an end of the sliding block away from the traction seat.

[0012] Furthermore, the brake pad is rotatably connected to one side of the fixing seat, the guide rail is fixed to the other side of the fixing seat, and the guide rail and the brake pad are arranged opposite to each other.

[0013] Furthermore, a layer of rubber gasket is adhered to the outer surface of the two brake pads, and the brake pads buffer the contact with the test model through the rubber gasket.

[0014] Furthermore, the free ends of the two brake pads are rotatably mounted with guide wheels respectively, and the conical end of the support cone is located between the two guide wheels and is tangent to the two guide wheels.

[0015] According to another object of the present invention, the present invention provides a method for using the above-mentioned drum wind tunnel test model protection device, comprising the following steps:

[0016] S1, unprotected state: the ends of the two brake pads are not supported, the two brake pads are close to each other in a contracted state, and the brake pads are not in contact with the inner wall of the test model;

[0017] S2, in the protection state: the linear traction mechanism drives the conical expansion device to move forward to expand the two brake pads, and the brake pads contact the inner surface of the test model to lock the test model;

[0018] S3, when no protection is needed, the linear traction mechanism drives the conical expansion device back to the original position and returns to the unprotected state.

[0019] The technical solution of the present invention has a compact structure and is easy to install inside the test model. The linear traction mechanism provides driving power to realize the operation of the protection mechanism. The linear traction mechanism can be installed outside the wind tunnel, saving the space of the wind tunnel test section. The device of the present invention adopts a contact braking protection method, and the contact surface is the inner surface of the test model. The protection effect is good, and a small force can also lock the model firmly, so the model will not be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the embodiment of the present invention in an unprotected state;

[0023] Figure 3 It is a schematic structural diagram of the embodiment of the present invention in a protected state;

[0024] In the figure, 1 is a fixed seat; 2 is a rubber gasket; 3 is a brake pad; 4 is a support rod; 5 is a support cone; 6 is a guide wheel; 7 is a test model; 8 is a guide rail; 9 is a slider; 10 is a traction rod; 11 is a traction seat. Specific embodiments

[0025] The following will clearly and completely describe the technical solutions of the present invention in combination with the embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Embodiment 1

[0029] As Figures 1 - 3 shown,

[0030] A protection device for a drum wind tunnel test model includes a fixed seat 1 and a support rod 4. During the test, the test model 7 is sleeved outside the support rod 4, the fixed seat 1 is mounted on the support rod 4 inside the test model 7, and a guide rail 8 and a traction seat 11 are fixedly mounted on one side of the fixed seat 1.

[0031] A slider 9 is slidably arranged on the guide rail 8. The slider 9 can make a linear reciprocating motion along the guide rail 8 freely. A support cone 5 is fixedly mounted at one end of the slider 9 away from the traction seat 11. A linear traction mechanism is fixed on the side of the traction seat 11 away from the guide rail 8.

[0032] The linear traction mechanism can be a cylinder or an electric push rod. The linear traction mechanism is connected to a traction rod 10. The traction rod 10 passes through the traction seat 11 and is fixedly connected to the slider 9. By the linear traction mechanism, the traction rod 10 can be driven to move back and forth, so that the slider 9 can be driven by the traction rod 10 to make a linear reciprocating motion on the guide rail 8, and further drive the support cone 5 to move back and forth.

[0033] On the other side of the fixed seat 1, two symmetrically arranged brake pads 3 are rotatably mounted by bolts. The brake pads 3 can rotate around the bolts. A layer of rubber gasket 2 is pasted on the outer surfaces of the two brake pads 3. The brake pads 3 buffer the contact with the test model 7 through the rubber gaskets 2.

[0034] The end portions of the free ends of the two brake pads 3 are respectively rotatably installed with guide wheels 6 through bolts. The conical end of the support cone 5 is located between the two guide wheels 6 and is tangent to the two guide wheels 6. When the support cone 5 moves forward driven by the slider 9, the support cone 5 can expand the guide wheels 6, realizing the opening of the brake pads 3, so that the brake pads 3 buffer the contact with the test model 7 through the rubber gaskets 2. Similarly, when the support cone 5 moves backward driven by the slider 9, the support cone 5 separates from the guide wheels 6, realizing the separation of the rubber gaskets 2 on the brake pads 3 from the test model 7.

[0035] When the present invention is in use, it is preferable to set the two brake pads symmetrically along the vertical plane, and the two brake pads are set in a vertical state. Springs can be installed between the two brake pads 3 or torsion springs can be set on the connecting shafts of the brake pads 3 and the fixed seat 1. Through the torsion springs, when the two brake pads 3 are not supported by the support cone 5, the two brake pads 3 approach each other and are in a contracted state, and do not contact the test model.

[0036] As Figure 2 shown, when the drum wind tunnel test model protection device of the present invention is in an unprotected state, the guide wheels 6 at the ends of the two brake pads 3 are not supported by the support cone 5, and the two brake pads 3 approach each other and are in a contracted state. The brake pads 3 and the rubber gaskets 2 on the brake pads 3 do not contact the inner wall of the test model 7.

[0037] As Figure 3 shown, when the drum wind tunnel test model protection device of the present invention is in a protected state, linear traction mechanisms such as cylinders and electric push rods drive the traction rod 10 to move forward, thereby driving the slider 9 to move forward. The support cone 5 on the slider 9 expands the guide wheels 6, the two brake pads 3 open, and the rubber gaskets 2 on the surfaces of the brake pads 3 contact the inner surface of the test model 7, firmly locking the test model 7 to achieve the purpose of protecting the model. After the test model 7 does not need to be protected, the linear traction mechanisms such as cylinders and electric push rods release the traction rod 10, and the support cone 5 returns to its original position and returns to the unprotected state.

[0038] The present invention can be used to protect the test model during the wind tunnel test to avoid damage to the test model caused by strong vibration. The whole device of the present invention is installed inside the test model. The device uses the traction rod 10 to realize the operation of the protection mechanism. The other end of the traction rod 10 can extend outside the wind tunnel, saving a large amount of test section space.

[0039] The structure of the present invention is compact and is easy to install inside the test model; linear traction mechanisms such as cylinders or electric push rods are used to provide driving power. The linear traction mechanisms can be installed outside the wind tunnel, and the slider is pulled by the traction rod to move linearly, saving the wind tunnel test section space. The device of the present invention adopts a contact-type braking protection method, and the contact surface is the inner surface of the test model, with good protection effect. Applying a small force can also firmly lock the model, so the model will not be damaged.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A protection device for a drum-type wind tunnel test model, characterized in that, It includes a support rod, a fixed seat, two brake pads, a conical expansion device and a linear traction mechanism. The fixed seat is fixed on the outside of the support rod. The two brake pads are symmetrically arranged and rotatably connected to the fixed seat. The conical expansion device is located between the end heads of the free ends of the two brake pads. The conical expansion device is connected to the linear traction mechanism, and the conical expansion device makes a linear reciprocating motion driven by the linear traction mechanism. The movement of the conical expansion device drives the two brake pads to approach or move away from each other. A test model is provided on the outside of the support rod, and the brake pads are located inside the test model. The conical expansion device includes a guide rail, a slider and a support cone. The guide rail is fixed on one side of the fixed seat. The slider is slidably arranged on the guide rail and can freely slide on the guide rail. The support cone is fixedly installed at the end head of the slider. The support cone is located between the end heads of the two brake pads. Guide wheels are respectively rotatably installed at the end parts of the free ends of the two brake pads. The conical end of the support cone is located between the two guide wheels and is tangent to the two guide wheels.

2. The drum-type wind tunnel test model protection device according to claim 1, characterized in that, A traction seat is also fixed on the fixed seat, and the linear traction mechanism is fixed on the traction seat.

3. The drum-type wind tunnel test model protection device according to claim 2, characterized in that, The linear traction mechanism is fixedly connected to the slider through a traction rod.

4. The drum-type wind tunnel test model protection device according to claim 3, wherein, The support cone is located at one end of the slider away from the traction seat.

5. The drum-type wind tunnel test model protection device according to claim 3, characterized in that, The brake pad is rotatably connected to one side of the fixed seat. The guide rail is fixed on the other side of the fixed seat, and the guide rail is arranged opposite to the brake pad.

6. The drum-type wind tunnel test model protection device according to claim 1, characterized in that, A layer of rubber gasket is pasted on the outer surfaces of the two brake pads, and the brake pads buffer the contact with the test model through the rubber gasket.

7. The method of using the protection device for the drum-type wind tunnel test model according to claim 1, characterized in that, It includes the following steps: S1. In the unprotected state: The ends of the two brake pads are not supported, the two brake pads approach each other and are in a contracted state, and the brake pads do not contact the inner wall of the test model. S2. In the protected state: The linear traction mechanism drives the conical expansion device to move forward to expand the two brake pads. The brake pads contact the inner surface of the test model and lock the test model. S3. After protection is no longer required, the linear traction mechanism drives the conical expansion device back to its original position and returns to the unprotected state.

Images