CN216241128U

CN216241128U - Full flow rate vibration amplification self-adaptive control device

Info

Publication number: CN216241128U
Application number: CN202122715288.9U
Authority: CN
Inventors: 陈文礼; 陈冠斌; 陈昌隆
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-04-08
Anticipated expiration: 2031-11-08

Abstract

The utility model discloses a full-flow-velocity vibration amplification self-adaptive control device which comprises a shell, a turbulence unit and an external spring suspension structure, wherein the shell is in a flat plate or square column shape, the turbulence unit is arranged in the shell, the turbulence unit can rotate in the shell in a direction vertical to the unfolding direction of the shell, an open slot is formed in the upper plane of the shell close to the front edge of the shell in an extending direction, the front end of the turbulence unit can extend out of the open slot, and an upper spring group and a lower spring group are arranged at the front end of the turbulence unit close to the front end of the turbulence unit and are respectively connected with the upper plane and the lower plane of the shell; the incoming flow flows through the front edge of the flat plate, and due to the existence of separation of the incoming flow, the shell can vibrate at a certain frequency, the turbulence unit vibrates at the same frequency in the shell along with the shell, and the front end of the turbulence unit continuously stretches up and down. The utility model has simple structure, 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 under the full flow speed of incoming flow.

Description

Full flow rate vibration amplification self-adaptive control device

Technical Field

The utility model relates to the field of structural flow-induced vibration amplification, in particular to a full-flow-speed vibration amplification self-adaptive control device.

Background

The principle of wind power generation is that wind energy is converted into mechanical energy, then the mechanical energy is converted into electric energy, and an instrument for finally converting the wind energy into the electric energy is a wind driven generator. Although wind generators using large blades to convert wind energy into mechanical energy are clean energy sources, wind generators have many disadvantages. When the wind turbine works, the geographical environment is greatly influenced, for example, the movement changes of ambient air and water vapor can be changed due to the large geometrical size of the wind turbine, and further the local climate changes. When the wind speed is low or the size of the blade is small, the blade type wind power generator is likely to be unable to convert wind energy into mechanical energy and further into electric energy. Blade type generators are also not suitable for harnessing water energy and other fluid energy. The existing flat plates convert wind or other fluid energy into mechanical energy, and the traditional flat plates generally only generate small-amplitude vortex-induced vibration at a few specific wind speeds, so that the fluid energy is not favorably quantized into the mechanical energy. Although the flutter has a large amplitude, the critical wind speed at which the flutter occurs is high, and the critical wind speed at which the flutter occurs is rarely reached in the natural environment.

SUMMERY OF THE UTILITY MODEL

Based on the above disadvantages, the present invention aims to provide a full-flow-velocity 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 velocity of the incoming flow.

The technology adopted by the utility model is as follows: a full flow rate vibration amplification self-adaptive control device comprises a shell, a turbulence unit and an external spring suspension structure, wherein the upper plane and the lower plane of the shell are connected with the upper end and the lower end of a fixed frame through the external spring suspension structure respectively, the shell is flat or square column-shaped, the turbulence unit is installed inside the shell, the turbulence unit can rotate in the direction perpendicular to the expansion direction of the shell inside the shell, an open slot is formed in the upper plane of the front edge close to the shell in an extending manner, the front end of the turbulence unit can extend out of the open slot, and an upper spring group and a lower spring group are installed at the front end close to the turbulence unit and are connected with the upper plane and the lower plane inside the shell respectively; the incoming flow flows through the flat front edge, because the existence of the separation of the incoming flow, make the casing can take place the vibration of certain frequency, the vortex unit takes place the same frequency vibration along with the casing vibration in the casing is inside, make the front end of vortex unit constantly stretch out and draw back from top to bottom, make the incoming flow take place periodic flow separation, thereby lead to the shear layer periodic beating the casing surface, produce and act on the periodic hydrodynamics of casing, and then give the same frequency disturbance power in flow field, the same frequency disturbance power acts on the casing again, under the given incoming flow velocity, along with the lapse of time, casing and vortex unit vibration amplitude are bigger and bigger, finally the vibration amplitude of casing reaches a stable amplitude.

Furthermore, the turbulence unit comprises a turbulence plate, a lever, a counterweight and a cross rod, the cross rod is fixedly connected with the inside of the shell, the axial direction of the cross rod is parallel to the expansion direction of the shell, the lever is vertically and rotatably connected with the cross rod, one end of the lever is fixedly connected with the lower end of the turbulence plate, the other end of the lever is connected with the counterweight, and the upper end of the turbulence plate can extend out of the open slot.

Furthermore, the cross bar is rotatably connected with the inside of the shell, and the cross bar is vertically and fixedly connected with the lever.

Furthermore, the device also comprises a vertical fixed rod, the cross rod is rotatably connected with the vertical fixed rod through a bearing pair, and the upper end and the lower end of the vertical fixed rod are respectively fixedly connected with the upper plane and the lower plane inside the shell.

Furthermore, two ends of the cross rod or the cross rod is rotatably connected to two side walls of the shell through a bearing pair.

Furthermore, the two levers are parallel to each other, and one ends of the two levers are fixedly connected with the lower ends of the two sides of the spoiler respectively.

Further, the natural frequency of the external spring suspension structure is equal to that of the spoiler unit.

The device has the advantages that the energy of the shear layer is stronger along with the enhancement of the incoming flow speed; the stronger the periodic aerodynamic forces generated by the shear layer, resulting in a greater amplitude of vibration of the flat panel. The mechanical energy of the vibration may be converted to electrical energy or other energy that can be stored.

The utility model has the advantages that: the utility model has simple structure, can well enhance the flow-induced vibration of a flat plate or square column-shaped structure, and can uninterruptedly convert the fluid kinetic energy into mechanical energy under the condition of incoming flow. The device can realize large vibration amplitude under the full flow rate of incoming flow, has obvious vibration amplification effect, and can be placed in air and liquid.

Drawings

Fig. 1 is a three-dimensional schematic diagram of a full-flow-rate vibration amplification adaptive control device of embodiment 1;

FIG. 2 is a two-dimensional schematic diagram of a full-flow-rate vibration amplification adaptive control device according to embodiment 1;

FIG. 3 is a two-dimensional schematic diagram of a full-flow-rate vibration amplification adaptive control device in embodiment 2

FIG. 4 is a graph comparing the results of approximate vibration calculations for a conventional flat panel and the apparatus of the present invention;

Detailed Description

The utility model will be further illustrated by way of example with reference to the accompanying drawings.

Example 1

As shown in fig. 1-2, a full flow velocity vibration amplification self-adaptive control device comprises a shell 1, a spoiler unit and an external spring suspension structure 2, wherein the upper plane and the lower plane of the shell are respectively connected with the upper end and the lower end of a fixed frame through the external spring suspension structure 2, the shell 1 is in a flat plate shape, the spoiler unit is arranged in the shell 1, the upper plane near the front edge of the shell extends to be provided with an open slot 3,

the flow disturbing unit comprises a flow

disturbing plate

4, 2

levers

5, 2 counterweight balls 6 and a cross rod 7, wherein the cross rod 7 is fixedly connected with two side walls inside the shell 1, the axial direction of the cross rod 7 is parallel to the unfolding direction of the shell 1, the 2 levers 5 are respectively and mutually and vertically and rotatably connected with the cross rod 7, the 2 levers 5 are mutually parallel, one ends of the 2 levers 5 are respectively and fixedly connected with two sides of the lower end of the flow disturbing plate 4, and the other end of each lever 5 is connected with one counterweight ball 6; the length of the open slot 3 corresponds to that of the spoiler 4, the upper end of the spoiler 4 can extend out of the open slot 3, and an upper spring group 8 and a lower spring group 8 are arranged at the positions close to the spoiler 4 and are respectively connected with the upper plane and the lower plane in the shell 1;

the natural frequency of the external spring suspension structure 2 is equal to that of the spoiler unit.

The embodiment is placed in the air, the wind current flows through the flat plate front edge, because the incoming current flows and separates, make the casing can take place the vibration of certain frequency, the vortex unit takes place the same frequency vibration along with the casing vibration in the casing is inside, make the vortex board of the front end of vortex unit constantly stretch out and draw back from top to bottom, make the incoming current take place periodic flow and separate, thereby lead to the shear layer periodic beating the casing surface, produce and act on the periodic aerodynamic force of casing, and then give the same frequency disturbance power in flow field, the same frequency disturbance power acts on the casing again, under given wind speed, along with the lapse of time, casing and vortex unit vibration amplitude are bigger and bigger, finally the vibration amplitude of casing reaches a stable amplitude.

Example 2

As shown in fig. 3, the present embodiment has substantially the same structure as embodiment 1, and differs therefrom in that: still include 2 vertical support rod 9, horizontal pole and 2 vertical support rod 9 be connected through 2 bearing pair rotations of group respectively, 2 vertical support rod's upper and lower end respectively with 1 inside upper and lower plane fixed connection of casing and parallel to each other, horizontal pole and 2 perpendicular fixed connection of

lever

5, 2 lever 5 and parallel to each other.

Example 3

The present embodiment has substantially the same structure as embodiment 1, but differs therefrom in that: the two ends of the cross rod are fixedly connected with the two side walls in the shell through bearing pairs, and the cross rod is vertically and fixedly connected with the 2 levers.

Example 4

As shown in fig. 4, the abscissa of the graph represents the converted wind speed, and the ordinate represents the dimensionless amplitude (a represents the maximum amplitude, and H represents the height of the flat plate). As can be seen from the figure, the common flat plate can vibrate only when the frequency of the tail flow is equal to the natural vibration frequency of the system, and the vibration amplitude is low. Thus, the device of the present invention can achieve full flow rate oscillation. At the same flow rate, the amplitude of the vibration generated by the device of the utility model is greater compared to a conventional flat plate. Therefore, the utility model has obvious vibration amplification effect.

Claims

1. The utility model provides a full velocity of flow vibration amplification self-adaptation controlling means, includes the casing, vortex unit and external spring suspended structure, its characterized in that, the last plane of casing be connected with fixed frame's upper and lower end through external spring suspended structure respectively with lower plane, the casing be dull and stereotyped or square column shape, at the internally mounted of casing have a vortex unit, the vortex unit can be perpendicular to the rotation of the exhibition of casing inside the casing to, plane extension has the open slot to opening on the leading edge that is close to the casing, the front end of vortex unit can be followed the open slot in stretch out, install upper and lower spring assembly near the front end of vortex unit, be connected with the inside upper and lower plane of casing respectively.

2. The full flow rate vibration amplification adaptive control apparatus according to claim 1, characterized in that: the flow disturbing unit comprises a flow disturbing plate, a lever, a balance weight and a cross rod, the cross rod is fixedly connected with the inside of the shell, the axial direction of the cross rod is parallel to the spreading direction of the shell, the lever is vertically and rotatably connected with the cross rod, one end of the lever is fixedly connected with the lower end of the flow disturbing plate, the other end of the lever is connected with the balance weight, and the upper end of the flow disturbing plate can extend out of the open slot.

3. The adaptive control device for full flow rate vibration amplification according to claim 2, wherein: the cross bar is rotatably connected with the inside of the shell, and the cross bar is vertically and fixedly connected with the lever.

4. A full flow rate vibration amplification adaptive control apparatus according to claim 3, wherein: the vertical fixing rod is rotatably connected with the cross rod through a bearing pair, and the upper end and the lower end of the vertical fixing rod are fixedly connected with the upper plane and the lower plane inside the shell respectively.

5. A full flow rate vibration amplification adaptive control apparatus according to claim 3, wherein: two ends of the cross rod are rotatably connected to two side walls of the shell or are rotatably connected to two side walls of the shell through bearing pairs.

6. A full flow rate vibration amplification adaptive control apparatus according to any one of claims 2 to 5, wherein: the two levers are parallel to each other, and one ends of the two levers are fixedly connected with the lower ends of the two sides of the spoiler respectively.

7. The adaptive control device for full flow rate vibration amplification according to claim 1, wherein: and the natural vibration frequency of the external spring suspension structure is equal to that of the turbulent flow unit.