A full-flow rate vibration amplification adaptive control device

Abstract

The present invention discloses a full-flow-rate vibration amplification adaptive control device, comprising a housing, a spoiler unit and an external spring suspension structure, wherein the housing is in the shape of a flat plate or a square column, a spoiler unit is installed inside the housing, the spoiler unit can rotate perpendicular to the span direction of the housing inside the housing, an open slot is opened in the plane extension direction near the front edge of the housing, the front end of the spoiler unit can extend from the open slot, an upper and lower spring group are installed near the front end of the spoiler unit, and are respectively connected to the upper and lower planes inside the housing; the incoming flow flows through the front edge of the flat plate, and due to the existence of the incoming flow separation, the housing vibrates at a certain frequency, and the spoiler unit vibrates at the same frequency inside the housing with the vibration of the housing, so that the front end of the spoiler unit continuously expands and contracts up and down. The present invention has a simple structure, can increase the flow-induced vibration amplitude of the flat plate or square column-shaped structure, and realize the flow-induced vibration of the device at the full flow rate of the incoming flow.

Description

Technical Field

[0001] The invention relates to the field of structural flow-induced vibration amplification, and in particular to a full-flow rate vibration amplification adaptive control device. Background Art

[0002] The principle of wind power generation is actually to convert wind energy into mechanical energy, and then convert mechanical energy into electrical energy. The instrument that finally converts wind energy into electrical energy is a wind turbine. Although wind turbines that use giant blades to convert wind energy into mechanical energy are based on clean energy wind energy as an energy source, they also have many disadvantages. When wind turbines are working, they will have a great negative impact on the geographical environment. For example, due to their large geometric size, the movement of surrounding air and water vapor will change, which will lead to changes in the local climate. When the wind speed is low or the blade size is small, the blade-type wind turbine is very likely to be unable to convert wind energy into mechanical energy and then into electrical energy. Blade-type generators are also not suitable for utilizing water energy and other fluid energy. Existing flat plates convert wind or other fluid energy into mechanical energy. Some traditional flat plates generally only have small amplitude vortex-induced vibrations at several specific wind speeds, which is not conducive to converting fluid energy into mechanical energy. Although flutter has a large amplitude, the critical wind speed for flutter is high and rarely reaches the critical wind speed of flutter in natural environments. Summary of the invention

[0003] In view of the above shortcomings, the purpose of the present invention is to provide a full-flow rate vibration amplification adaptive control device, which can increase the flow-induced vibration amplitude of a flat plate or square column shaped structure and realize the flow-induced vibration of the device at the full flow rate of the incoming flow.

[0004] The technology adopted by the present invention is as follows: a full-flow rate vibration amplification adaptive control device, including a shell, a spoiler unit and an external spring suspension structure, the upper plane and the lower plane of the shell are respectively connected to the upper and lower ends of the fixed frame through the external spring suspension structure, the shell is in the shape of a flat plate or a square column, a spoiler unit is installed inside the shell, the spoiler unit can rotate perpendicular to the span direction of the shell inside the shell, an open groove is opened in the extension direction of the upper plane near the front edge of the shell, the front end of the spoiler unit can extend from the open groove, and an upper and lower spring group are installed near the front end of the spoiler unit, which are respectively connected to the upper and lower spring groups inside the shell. The incoming flow flows through the leading edge of the flat plate. Due to the existence of the incoming flow flow separation, the shell vibrates at a certain frequency. The spoiler unit vibrates at the same frequency inside the shell as the shell vibrates, so that the front end of the spoiler unit continuously expands and contracts up and down, causing the incoming flow to undergo periodic flow separation, thereby causing the shear layer to periodically beat the shell surface, generating periodic fluid dynamics acting on the shell, and then giving the flow field a disturbance dynamics of the same frequency, which in turn acts on the shell. Under a given incoming flow velocity, with the passage of time, the vibration amplitudes of the shell and the spoiler unit become larger and larger, and finally the vibration amplitude of the shell reaches a stable amplitude.

[0005] Furthermore, the spoiler unit includes a spoiler, a lever, a counterweight and a cross bar, the cross bar is fixedly connected to the inside of the shell, the axial direction of the cross bar is parallel to the span direction of the shell, the lever and the cross bar are connected to each other vertically, one end of the lever is fixedly connected to the lower end of the spoiler, the other end of the lever is connected to the counterweight, and the upper end of the spoiler can extend from the opening groove.

[0006] Furthermore, the cross bar is rotatably connected to the inside of the shell, and the cross bar is vertically fixedly connected to the lever.

[0007] Furthermore, the device also includes a vertical fixing rod, the cross rod and the vertical fixing rod are rotatably connected via a bearing pair, and the upper and lower ends of the vertical fixing rod are fixedly connected to the upper and lower planes inside the shell respectively.

[0008] Furthermore, the two ends of the crossbar are rotatably connected to the two side walls of the shell through a bearing pair.

[0009] Furthermore, there are two levers which are parallel to each other, and one end of the two levers is fixedly connected to the lower ends of both sides of the spoiler respectively.

[0010] Furthermore, the natural frequency of the external spring suspension structure is equal to the natural frequency of the spoiler unit.

[0011] In this device, as the incoming flow velocity increases, the energy of the shear layer becomes stronger; the periodic aerodynamic force generated by the shear layer becomes stronger, resulting in a larger vibration amplitude of the plate. The mechanical energy of vibration can be converted into electrical energy or other storable energy.

[0012] Beneficial effects and advantages of the present invention: The present invention has a simple structure, can well enhance the flow-induced vibration of a flat plate or square column-shaped structure, and can continuously convert the fluid kinetic energy into mechanical energy under the incoming flow condition. It can achieve a large vibration amplitude at the full flow rate of the incoming flow, has an obvious vibration amplification effect, and the device can be placed not only in the air but also in the liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the full flow rate vibration amplification adaptive control device of Example 1;

[0014] Figure 2 It is a two-dimensional schematic diagram of the full flow rate vibration amplification adaptive control device of Example 1;

[0015] Figure 3 A two-dimensional schematic diagram of the full flow rate vibration amplification adaptive control device of Example 2

[0016] Figure 4 A comparison diagram of vibration approximate calculation results of a common flat plate and the device of the present invention; DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] Example 1

[0019] like Figure 1-2 As shown, a full flow rate vibration amplification adaptive control device includes a shell 1, a spoiler unit and an external spring suspension structure 2. The upper plane and the lower plane of the shell are respectively connected to the upper and lower ends of the fixed frame through the external spring suspension structure 2. The shell 1 is in the shape of a flat plate. The spoiler unit is installed inside the shell 1. The upper plane near the front edge of the shell extends to have an open slot 3.

[0020] The spoiler unit includes a spoiler 4, two levers 5, two weighted balls 6 and a cross bar 7, wherein the cross bar 7 is fixedly connected to the two side walls inside the shell 1, the axial direction of the cross bar 7 is parallel to the span direction of the shell 1, the two levers 5 are respectively connected to the cross bar 7 for vertical rotation, the two levers 5 are parallel to each other, one end of the two levers 5 is respectively fixedly connected to the two sides of the lower end of the spoiler 4, and the other end of each lever 5 is connected to a weighted ball 6; the opening slot 3 corresponds to the length of the spoiler 4, the upper end of the spoiler 4 can extend from the opening slot 3, and upper and lower springs 8 groups are installed near the spoiler 4, which are respectively connected to the upper and lower planes inside the shell 1;

[0021] The natural frequency of the external spring suspension structure 2 is equal to the natural frequency of the spoiler unit.

[0022] The embodiment is placed in the air, and the wind flows through the leading edge of the flat plate. Due to the existence of the flow separation of the incoming flow, the shell vibrates at a certain frequency, and the spoiler unit vibrates at the same frequency inside the shell as the shell vibrates, so that the spoiler at the front end of the spoiler unit continuously expands and contracts up and down, causing the incoming flow to undergo periodic flow separation, thereby causing the shear layer to periodically beat the surface of the shell, generating a periodic aerodynamic force acting on the shell, and then giving the flow field a disturbance force of the same frequency, which in turn acts on the shell. At a given wind speed, as time goes by, the vibration amplitudes of the shell and the spoiler unit become larger and larger, and finally the vibration amplitude of the shell reaches a stable amplitude.

[0023] Example 2

[0024] like Figure 3 As shown, the structure of this embodiment is roughly the same as that of embodiment 1, with the difference being that it also includes two vertical support rods 9, the cross bar is rotationally connected to the two vertical support rods 9 through two sets of bearing pairs, the upper and lower ends of the two vertical support rods are fixedly connected to the upper and lower planes inside the shell 1 and are parallel to each other, the cross bar is vertically fixedly connected to the two levers 5, and the two levers 5 are parallel to each other.

[0025] Example 3

[0026] The structure of this embodiment is substantially the same as that of the first embodiment, except that the two ends of the cross bar are fixedly connected to the two side walls inside the housing through a bearing pair, and the cross bar is fixedly connected to the two levers perpendicularly to each other.

[0027] Example 4

[0028] like Figure 4As shown in the figure, the horizontal axis is the converted wind speed, and the vertical axis is the dimensionless amplitude (A is the maximum amplitude, and H is the height of the plate). It can be seen from the figure that an ordinary plate can only vibrate when the wake frequency is equal to the natural frequency of the system, and the vibration amplitude is low. Therefore, the device of the present invention can achieve vibration at full flow rate. At the same flow rate, compared with the ordinary plate, the amplitude of the device of the present invention is larger. Therefore, the present invention has an obvious vibration amplification effect.

Claims

1. A full flow rate vibration amplification adaptive control device, comprising a housing, a spoiler unit and an external spring suspension structure, characterized in that: The upper plane and the lower plane of the shell are respectively connected to the upper and lower ends of the fixed frame through an external spring suspension structure. The shell is in the shape of a flat plate or a square column. A spoiler unit is installed inside the shell. The spoiler unit can rotate perpendicular to the span direction of the shell inside the shell. An open groove is opened in the upper plane extension direction near the front edge of the shell. The front end of the spoiler unit can extend from the open groove. An upper and a lower spring group are installed near the front end of the spoiler unit, which are respectively connected to the upper and lower planes inside the shell; the incoming flow flows through the front edge of the flat plate. Due to the existence of the incoming flow separation, the shell vibrates at a certain frequency. The spoiler unit vibrates at the same frequency inside the shell with the vibration of the shell, so that the front end of the spoiler unit is continuously stretched up and down, so that the incoming flow is periodically separated, thereby causing the shear layer to periodically beat the shell surface, generating a periodic fluid power acting on the shell, and then giving the flow field a same-frequency disturbance power. The same-frequency disturbance power acts on the shell. Under a given incoming flow velocity, as time goes by, the vibration amplitudes of the shell and the spoiler unit become larger and larger, and finally the vibration amplitude of the shell reaches a stable amplitude.

2. A full flow rate vibration amplification adaptive control device according to claim 1, characterized in that: The spoiler unit includes a spoiler, a lever, a counterweight and a cross bar. The cross bar is fixedly connected to the inside of the shell, the axial direction of the cross bar is parallel to the span direction of the shell, the lever and the cross bar are connected to each other vertically, one end of the lever is fixedly connected to the lower end of the spoiler, and the other end of the lever is connected to the counterweight. The upper end of the spoiler can extend from the open groove.

3. A full flow rate vibration amplification adaptive control device according to claim 2, characterized in that: The cross bar is either rotatably connected to the inside of the shell, or vertically fixedly connected to the lever.

4. A full flow rate vibration amplification adaptive control device according to claim 3, characterized in that: It also includes a vertical fixing rod. The cross rod is rotatably connected to the vertical fixing rod through a bearing pair. The upper and lower ends of the vertical fixing rod are respectively fixedly connected to the upper and lower planes inside the shell.

5. A full flow rate vibration amplification adaptive control device according to claim 3, characterized in that: The two ends of the crossbar are rotatably connected to the two side walls of the shell through a bearing pair.

6. A full flow rate vibration amplification adaptive control device according to any one of claims 2 to 5, characterized in that: There are two levers which are parallel to each other, and one end of the two levers is fixedly connected to the lower ends of both sides of the spoiler respectively.

7. A full flow rate vibration amplification adaptive control device according to claim 1, characterized in that: The natural frequency of the external spring suspension structure is equal to the natural frequency of the spoiler unit.

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