A bridge wind-induced vibration suppression device using bionic technology

Abstract

The present invention discloses a bridge wind vibration suppression device using bionic technology, belonging to the technical field of bridge engineering. It includes a number of flexible elements, and a number of the flexible elements are fixedly suspended on the side of the bridge, and a pulling mechanism for changing its rigidity is provided on the flexible element. This technical solution is used to improve the anti-vortex vibration ability of the bridge.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and particularly relates to a bridge wind vibration suppression device using bionic technology. Background Art

[0002] In some related technologies, when the air flow passes through the bridge structure, it will separate up and down along the bridge deck, forming periodic vortex shedding, and generating periodic aerodynamic forces acting on the bridge. When the vortex shedding frequency is consistent with a certain vibration frequency of the bridge structure, it will excite the vortex-induced resonance of the bridge. Since the vortex vibration is extremely sensitive to the aerodynamic shape of the structure, currently, additional aerodynamic measures such as installing wind nozzles and flow deflectors on the main girder are often used to change the flow field state around the structure, thereby improving its aerodynamic performance, avoiding or delaying the occurrence of vortex shedding, and achieving the effect of suppressing vortex vibration. However, for main girder sections such as π-shaped main girders and separated double-box main girders that are prone to vortex-induced resonance, with the increase of the bridge span, using traditional aerodynamic measures sometimes cannot achieve the ideal vibration suppression effect. Therefore, there is an urgent need to propose a bridge anti-vortex vibration device with good vibration suppression effect and wide universality. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a bridge wind vibration suppression device using bionic technology to improve the anti-vortex vibration ability of the bridge.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A bridge wind vibration suppression device using bionic technology of the present invention is arranged on the windward surface on the side of the bridge, and includes a plurality of flexible elements. The plurality of flexible elements are all fixedly suspended on the side of the bridge, and a pulling mechanism for changing its rigidity is provided on the flexible element.

[0006] The working principle of this technical solution is as follows:

[0007] By setting flexible elements, when the flexible elements are affected by wind force, since the magnitude of the wind force changes continuously, the vibration frequency of the flexible elements will change continuously. At the same time, by setting a pulling mechanism, the softness (rigidity) of the flexible elements can also be changed, thereby further changing the frequency of the flexible elements. The change in the vibration frequency of the flexible elements will generate different frequency vortex shedding states, so that irregular vortex shedding will occur on the bridge surface. Therefore, the vortex shedding frequency will not be coupled and locked with the structural frequency of the bridge main girder, avoiding the occurrence of vortex-induced resonance.

[0008] Furthermore, a number of rigid members are also provided on the side surface of the bridge. The rigid members are arranged between adjacent flexible elements, and the flexible elements are arranged on the side surface of the bridge at equal intervals. The advantage is that the setting of the rigid members can cause differences in the vortex shedding frequency and state between the positions of the rigid members and the flexible elements, and it is not easy to have a unified periodic vortex shedding along the bridge length, further improving the effect of the bridge in suppressing vortex-induced vibration.

[0009] Furthermore, the flexible element is in the shape of a fish fin and is made of flexible fabric. The advantage is that the shape of the bionic fish fin makes the vibration frequency of the flexible element vary when it is affected by the wind force, resulting in a variety of vortex shedding frequencies when the air flow bypasses the main beam of the bridge.

[0010] Furthermore, the pulling mechanism is an electromagnetic spring telescopic mechanism arranged on both sides of the flexible element. The main body of the electromagnetic spring telescopic mechanism is fixed on the side surface of the bridge, and the telescopic end of the electromagnetic spring telescopic mechanism is fixed on the flexible element. The advantage is that the electromagnetic spring telescopic mechanism can be remotely controlled, so as to remotely and real-time control and change the stiffness of the flexible element according to different wind forces.

[0011] Furthermore, the pulling mechanisms are symmetrically arranged on both sides of the flexible element. The pulling mechanism includes a hollow threaded rod. A sliding through groove is provided on the threaded rod in the direction parallel to the flexible element. A sliding ring is sleeved on the threaded rod. The inner side surface of the sliding ring is provided with internal threads matching the threads on the hollow threaded rod. A number of blades are provided on the outer side surface of the sliding ring and are circumferentially and evenly arranged obliquely on the outer side surface of the sliding ring. A sliding column is arranged inside the threaded rod. Stop rods are provided on the outer side surfaces at both ends of the sliding column. The stop rods are arranged on both outer sides of the sliding ring and are located in the sliding through groove. An elastic pulling rope is provided at one end of the sliding column. One end of the elastic pulling rope is fixed on the sliding column, and the other end of the elastic pulling rope is fixed on one side surface of the flexible element.

[0012] Under the action of the wind force, the blades make a rotary linear motion on the hollow threaded rod. Under the action of the stop rods, the sliding ring will drive the sliding column to move inside the hollow threaded rod, thereby pulling the elastic pulling rope to move, so as to pull both sides of the flexible element. That is, the stiffness of the flexible element will change, and its vibration frequency will also change at any time with the magnitude of the pulling force. When the wind force is small, the elastic pulling rope will pull the sliding ring to reset. During the reset process, the elastic force of the elastic pulling rope changes continuously, and it will also cause the frequency of the flexible element to change continuously. Therefore, it can realize changing the stiffness (frequency) of the elastic element by using wind energy, and further play a role in suppressing vortex-induced vibration.

[0013] Furthermore, a direction-changing mechanism is provided at the connection part between the blade and the slip ring. The direction-changing mechanism includes a mounting cylinder, a direction-changing column, a direction-changing ring, a first magnet, a connecting column, and a second magnet. One end of the mounting cylinder is fixed to the slip ring, one end of the direction-changing column is fixed to the middle of the bottom surface of the mounting cylinder, the direction-changing ring is sleeved on the direction-changing column, the first magnet is fixed to the outer side surface of the direction-changing ring, one end of the connecting column is fixed to the outer side surface of the direction-changing ring, the other end of the connecting column is fixed to the lower end of the blade, and the second magnet is arranged at both ends of the hollow threaded rod. The first magnet at one end of the hollow threaded rod is arranged to repel the second magnet, and the first magnet and the second magnet at the other end are arranged to attract each other.

[0014] When the wind force in one direction continues, the blade will rotate to the end of the hollow threaded rod. At this time, the first magnet and the second magnet are in an up-and-down position. Due to the repulsion between the two, the direction-changing ring will rotate and rise on the direction-changing column under the action of the repulsive force. Thus, the turning of the blade is realized, that is, the blade will rotate in the reverse direction under the action of the wind force. When it moves to the other end, the first magnet and the second magnet attract each other, causing the blade to rotate back to its original position, and further realizing the reciprocating rotational linear motion of the blade on the hollow threaded rod. It is not difficult to understand that repulsive magnets can be arranged on the side direction of the attracting end to facilitate the separation of the first magnet and the second magnet under the action of the repulsive force and the wind force.

[0015] Furthermore, a limiting sleeve for limiting the movement position of the slip ring is provided at the end of the threaded rod. Its advantage is that it can avoid interference between the blade and the fixing element of the end hollow threaded steel, and can play the role of positioning the movement position of the blade, ensuring the acting positions of the first magnet and the second magnet.

[0016] Furthermore, the pulling mechanism is arranged between adjacent flexible elements, and elastic pulling ropes are provided at both ends of the sliding column. One end of the elastic pulling rope is connected to the end of the sliding column, and the other end of the elastic pulling rope is fixed to the side surface of the flexible element. Its advantage is that this setting method connects all the flexible elements, further realizing the diversity of frequency changes.

[0017] The beneficial effects of the present invention are as follows:

[0018] (1) The setting of the pulling mechanism can change the softness (rigidity) of the flexible element, and thus change the frequency of the flexible element. Therefore, the frequency of vortex shedding is also constantly changing, and it is not easy for the vortex shedding frequency to lock with the bridge frequency, thereby achieving the effect of suppressing vortex-induced vibration; (2) The setting of the fish fin-shaped flexible element makes the swinging mode of the flexible element diverse, and thus its frequency change is diverse, thereby achieving the effect of suppressing vortex-induced vibration; (3) The setting of components such as the hollow threaded rod and the elastic pulling rope can utilize wind energy and elastic potential energy to change the stiffness of the flexible element; (4) The setting of the steering mechanism can turn the blade by using the repulsive force and attractive force of the magnet, so that the blade can achieve reciprocating motion, that is, the device can continuously change the stiffness of the flexible element in a one-sided continuous wind, and thus the frequency is constantly changing, further improving the effect of suppressing vortex-induced vibration of the bridge.

[0019] Other advantages, objectives and features of the present invention will be described in the subsequent specification, and to some extent, they are obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0021] Figure 1 It is a three-dimensional schematic diagram of the vibration suppression device of the present invention installed on the bridge;

[0022] Figure 2 It is a front view schematic diagram of the vibration suppression device of the present invention installed on the bridge;

[0023] Figure 3 It is a three-dimensional schematic diagram of the connection mode between the pulling mechanism and the flexible element in the vibration suppression device of the present invention;

[0024] Figure 4 It is a front view schematic diagram of the connection mode between the pulling mechanism and the flexible element in the vibration suppression device of the present invention;

[0025] Figure 5 It is a three-dimensional schematic diagram of the pulling mechanism in the vibration suppression device of the present invention;

[0026] Figure 6 It is a front view cross-sectional schematic diagram of the pulling mechanism in the vibration suppression device of the present invention;

[0027] Figure 7 In the vibration suppression device of the present invention Figure 6 Local enlarged schematic diagram at position B;

[0028] Figure 8Schematic diagram of the internal thread provided on the slip ring in the traction mechanism of the vibration suppression device of the present invention;

[0029] Figure 9 Schematic design diagram of one of the phase-changing columns and phase-changing rings in the present invention.

[0030] The markings in the attached drawings are as follows:

[0031] Bridge 1, flexible element 2, traction mechanism 3, rigid member 4, fixed block 310, hollow threaded rod 311, sliding through groove 312, blade 314, mounting cylinder 315, direction-changing column 316, direction-changing ring 317, first magnet 318, connecting column 319, sliding column 320, retaining rod 321, second magnet 322, elastic traction rope 323, limiting sleeve 324, sliding ring 325. Detailed implementation manner

[0032] As Figures 1 to 9 shown, a bridge wind vibration suppression device using bionic technology in the present invention is arranged on the windward side of the side of the bridge and includes a plurality of flexible elements. The plurality of flexible elements are all suspended and fixed on the side of the bridge, and a traction mechanism for changing its rigidity is provided on the flexible elements.

[0033] The working principle of this technical solution is as follows:

[0034] By arranging the flexible elements, when the flexible elements are affected by the wind force, since the magnitude of the wind force changes continuously, the vibration frequency of the flexible elements will change continuously. At the same time, by arranging the traction mechanism, the softness (rigidity) of the flexible elements can also be changed, thereby further changing the frequency of the flexible elements. The change in the vibration frequency of the flexible elements will generate different frequency vortex shedding states, so that irregular vortex shedding will occur on the surface of the bridge. Therefore, the vortex shedding frequency will not be coupled and locked with the structural frequency of the bridge main girder, avoiding the occurrence of vortex-induced resonance.

[0035] A plurality of rigid members are also arranged on the side of the bridge. The rigid members are arranged between adjacent flexible elements. The flexible elements are arranged on the side of the bridge at equal intervals. The arrangement of the rigid members can make the vortex shedding frequency and state at the positions of the rigid members and the flexible elements different, and it is not easy to have a unified periodic vortex shedding along the bridge length, further improving the effect of the bridge in suppressing vortex vibration. Preferably, for aesthetics, the traction mechanism is connected to the rigid member through a fixing plate.

[0036] The flexible element is in the shape of a fish fin, and the flexible element is made of flexible fabric. The shape of the bionic fish fin makes the vibration frequency of the flexible element itself vary diversely when it is affected by the wind force, resulting in diverse changes in the vortex shedding frequency when the air flow bypasses the bridge main girder.

[0037] The pulling mechanism is an electromagnetic spring telescopic mechanism arranged on both sides of the flexible element. The main body of the electromagnetic spring telescopic mechanism is fixed on the side of the bridge, and the telescopic end of the electromagnetic spring telescopic mechanism is fixed on the flexible element. The electromagnetic spring telescopic mechanism can be remotely controlled, so as to remotely and real-time control and change the stiffness of the flexible element according to different wind forces.

[0038] The pulling mechanisms are symmetrically arranged on both sides of the flexible element. The pulling mechanism includes a hollow threaded rod. A sliding through groove is provided on the threaded rod in the direction parallel to the flexible element. A sliding ring is sleeved on the threaded rod. An internal thread matching the thread on the hollow threaded rod is provided on the inner side surface of the sliding ring. A plurality of blades are provided on the outer side surface of the sliding ring and are circumferentially and evenly arranged obliquely on the outer side surface of the sliding ring. A sliding column is arranged inside the threaded rod. Stop rods are provided on the outer side surfaces at both ends of the sliding column. The stop rods are arranged on both outer sides of the sliding ring and are located in the sliding through groove. An elastic pulling rope is provided at one end of the sliding column. One end of the elastic pulling rope is fixed on the sliding column, and the other end of the elastic pulling rope is fixed on one side surface of the flexible element.

[0039] Under the action of wind force, the blades make a rotary linear motion on the hollow threaded rod. Under the action of the stop rods, the sliding ring will drive the sliding column to move inside the hollow threaded rod, thereby pulling the elastic pulling rope to move, so as to pull both sides of the flexible element. That is, the stiffness of the flexible element will change, and its vibration frequency will also change at any time with the magnitude of the pulling force. When the wind force is small, the elastic pulling rope will pull the sliding ring to reset. During the reset process, the elastic force of the elastic pulling rope changes continuously, and it will also cause the frequency of the flexible element to change continuously. Therefore, it can realize changing the stiffness (frequency) of the elastic element by using wind energy, and further play a role in suppressing vortex-induced vibration.

[0040] A direction-changing mechanism is provided at the connection part between the blade and the sliding ring. The direction-changing mechanism includes an installation cylinder, a direction-changing column, a direction-changing ring, a first magnet, a connecting column and a second magnet. One end of the installation cylinder is fixed on the sliding ring. One end of the direction-changing column is fixed on the middle of the bottom surface of the installation cylinder. The direction-changing ring is sleeved on the direction-changing column. The first magnet is fixed on the outer side surface of the direction-changing ring. One end of the connecting column is fixed on the outer side surface of the direction-changing ring, and the other end of the connecting column is fixed on the lower end of the blade. The second magnets are arranged at both ends of the hollow threaded rod. The first magnet at one end of the hollow threaded rod is arranged in a repulsive manner with the second magnet, and the first magnet and the second magnet at the other end are arranged in an attractive manner.

[0041] When the wind force in one direction is continuous, the blade will rotate to the end of the hollow threaded rod. At this time, the first magnet and the second magnet are in an up-and-down position. Due to the repulsion between them, under the action of the repulsive force, the direction-changing ring will rotate and rise on the direction-changing column. Therefore, the steering of the blade is achieved, that is, the reverse rotation will be realized under the action of the wind force. When it moves to the other end, the first magnet and the second magnet attract each other, causing the blade to rotate and reset, thereby realizing the reciprocating rotary linear motion of the blade on the hollow threaded rod. It is not difficult to understand that repulsive magnets can be arranged on the side direction of the attracting end to facilitate the separation of the first magnet and the second magnet under the action of the repulsive force and the wind force. The first magnet and the second magnet are preferably permanent magnets.

[0042] A limiting sleeve for limiting the movement position of the slip ring is provided at the end of the threaded rod to prevent interference between the blade and the fixing element of the end hollow threaded steel, and it can also play the role of positioning the movement position of the blade to ensure the acting positions of the first magnet and the second magnet.

[0043] The pulling mechanism is arranged between adjacent flexible elements, and elastic pulling ropes are provided at both ends of the sliding column. One end of the elastic pulling rope is connected to the end of the sliding column, and the other end of the elastic pulling rope is fixed to the side surface of the flexible element. This setting method connects all the flexible elements to further realize the diversity of frequency changes.

[0044] It should be noted that in this technical solution, the setting method of the direction-changing column and the direction-changing ring can be that the direction-changing column is a helical shape formed by twisting a vertical plate, and a through groove matching the helical direction of the direction-changing column is provided in the middle of the direction-changing ring. The direction-changing ring can perform a rotary linear motion on the direction-changing column. Specifically, it can refer to the movement mode of a hand-pushed flying saucer in a toy. At the same time, the setting method of the blade is a prior art, and it is a prior art that those skilled in the art can understand that the change in the inclination angle of the blade can change the rotation direction. As for how many degrees of rotation are required to achieve the change in the windward surface of the blade, it can be set according to the actual situation, and those skilled in the art can easily design a blade that conforms to the above movement mode. Therefore, it will not be elaborated too much here.

[0045] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A bridge wind vibration suppression device using bionic technology is arranged on the windward side of the bridge side. It is characterized in that: It includes a number of flexible elements, and a number of the flexible elements are all vertically fixed on the side of the bridge. A pulling mechanism for changing its rigidity is arranged on the flexible element; a number of rigid members are also arranged on the side of the bridge, and the rigid members are arranged between adjacent flexible elements. The flexible elements are arranged on the side of the bridge at equal intervals; the flexible elements are in the shape of fish fins, and the flexible elements are made of flexible cloth; the pulling mechanism is an electromagnetic spring telescopic mechanism arranged on both sides of the flexible element. The main body of the electromagnetic spring telescopic mechanism is fixed on the side of the bridge, and the telescopic end of the electromagnetic spring telescopic mechanism is fixed on the flexible element.

2. A bridge wind vibration suppression device using bionic technology according to claim 1, It is characterized in that: The pulling mechanisms are symmetrically arranged on both sides of the flexible element. The pulling mechanism includes a hollow threaded rod. A sliding through groove is arranged on the threaded rod in the direction parallel to the flexible element. A sliding ring is sleeved on the threaded rod. An internal thread matching the thread on the hollow threaded rod is arranged on the inner side surface of the sliding ring. A number of blades are arranged on the outer side surface of the sliding ring in an inclined and circumferentially evenly distributed manner. A sliding column is arranged inside the threaded rod. Stop rods are arranged on the outer side surfaces at both ends of the sliding column. The stop rods are arranged on both sides outside the sliding ring and are located in the sliding through groove. An elastic pulling rope is arranged at one end of the sliding column. One end of the elastic pulling rope is fixed on the sliding column, and the other end of the elastic pulling rope is fixed on one side surface of the flexible element.

3. A bridge wind vibration suppression device using bionic technology according to claim 2, It is characterized in that: A direction-changing mechanism is arranged at the connection part between the blade and the sliding ring. The direction-changing mechanism includes an installation cylinder, a direction-changing column, a direction-changing ring, a first magnet, a connection column and a second magnet. One end of the installation cylinder is fixed on the sliding ring. One end of the direction-changing column is fixed on the middle of the bottom surface of the installation cylinder. The direction-changing ring is sleeved on the direction-changing column. The first magnet is fixed on the outer side surface of the direction-changing ring. One end of the connection column is fixed on the outer side surface of the direction-changing ring, and the other end of the connection column is fixed on the lower end of the blade. The second magnets are arranged at both ends of the hollow threaded rod. The first magnet at one end of the hollow threaded rod is arranged in a repulsive manner with the second magnet, and the first magnet and the second magnet at the other end are arranged in an attractive manner.

4. A bridge wind vibration suppression device using bionic technology according to claim 3, It is characterized in that: A limit sleeve for limiting the movement position of the sliding ring is arranged at the end of the threaded rod.

5. A bridge wind vibration suppression device using bionic technology according to claim 4, It is characterized in that: The pulling mechanism is arranged between adjacent flexible elements, and elastic pulling ropes are arranged at both ends of the sliding column. One end of the elastic pulling rope is connected to the end of the sliding column, and the other end of the elastic pulling rope is fixed on the side surface of the flexible element.

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