KR20060087105A - Semiactive damper for damping vibration of structures - Google Patents

Abstract

The present invention, the fixing plate coupled to the structure, the rotating plate coupled to the fixed plate in a structure rotatable about the axis eccentric with the center, and the end portion is wound on the rotating plate and both ends are coupled to the structure that the distance between the fixed plate is changed, respectively And a friction piece provided at a portion where the fixed plate and the rotating plate are in contact with and released from the rotation of the rotating plate, a rheological fluid provided at a portion where the rotating plate and the fixed plate are in constant contact with the coil, and a coil supplying a magnetic field to the rheological fluid; Including a power supply unit for applying power to the coil, and a control unit for controlling the operation of the power supply unit, the force supporting the structure is changed according to the magnitude of the external force applied to the structure, and the basic damping force can be set before the structure is mounted. Semi-active for damping structure vibrations configured to easily change the damping force even after being mounted on the structure Provide a variable damper.

Structures, vibrations, damping, eccentrics, rheological fluids, friction pieces

Description

Semiactive damper for damping vibration of structures

1 is an exploded perspective view of a conventional damper.

2 is a schematic front view showing an example of use of a conventional damper.

Figure 3 is an exploded perspective view of the vibration damping semi-active variable damper according to the present invention.

4 is a front view showing a shape in which the vibration damping semi-active variable damper according to the present invention is installed in a structure.

5 is a cross-sectional view taken along the line A-A shown in FIG. 4.

FIG. 6 is a front view illustrating a shape in which the top of the structure is inclined to the right in the state shown in FIG. 4.

FIG. 7 is a cross-sectional view taken along the line B-B shown in FIG. 6.

<Description of the symbols for the main parts of the drawings>

100: fixed plate 200: rotating plate

210: seating groove 212: fluid groove

220: friction piece 310: bolt

320: nut 400: cable

500 rheological fluid 610 coil

620: wire 700: control unit

The present invention relates to a damper for damping the vibration of the structure, and more particularly, it is possible to set the basic damping force according to the user's selection and for the structure vibration damping configured to easily change the damping force even when installed in the structure A semi-active variable damper.

When the structural member is subjected to a horizontal external force, torsion or similar horizontal movement occurs. Torsion, in particular in building structures or towers, can result in severe impact or even collapse of the structure.

As described above, dampers (abbreviated as 'dampers') for absorbing shocks and vibrations applied to a structure play an important role in protecting a structure, for example, a house or a similar building structure, and the dampers have numerous deformation forms. Exists as. Dampers are generally means of damping movement by frictional forces between two moving parts attached between structural members of a building or by fluids flowing and pressurizing between two chambers through restricted tubes, There are active dampers that actively change the damping effect corresponding to the state and passive dampers having a constant magnitude of damping effect.

Hereinafter, a conventional damper will be described with reference to the accompanying drawings.

1 is an exploded perspective view of a conventional damper, and FIG. 2 is a front view showing an example of use of a conventional damper.

 As shown in FIGS. 1 and 2, the damper according to the invention comprises, for example, a central plate 10 provided with a coupling hole 12 for coupling to an upper pillar 1 of a structure, and a central plate 10. It consists of two side plates 20 coupled to both sides of the. The side plate 20 is formed with a cable hole 22 for coupling the cable 70. The friction pieces 220 and 30 made of a material having a large friction force are disposed between the center plate 10 and the side plate 20, and the disc spring 40 is disposed on the outer surface of each of the side plates 20. The bond 50 is inserted through the center of the center plate 10, the friction piece 30, the side plate 20, and the disc spring 40 to be coupled to the nut 60. The bolt 50, the nut 60, and the disc spring 40 serve to compress the center plate 10 and the side plate 20 to the friction pieces 220 and 30. The user may adjust the friction force between the plates 10 and 20 and the friction piece 30 by adjusting the fastening force between the bolt 50 and the nut 60.

That is, the one or more disk springs 40 mounted between the head of the bolt 10 and the side plate 20 and between the nut 60 and the side plate 20 have a fixed holding force when the damper is in the operating state. Keep it.

When the upper pillar is moved left and right as shown in FIG. 2 by an external force such as an earthquake, the vertical pillar 2 is inclined left and right, and the plates 10 and 20 and the friction piece 30 are slid to the center plate ( The coupling angle between the 10) and the side plate 20 is changed. At this time, the external force is initially absorbed by the viscoelastic force between the plates 10 and 20 and the friction piece 30 so that the upper column 1 starts to move, and the external force applied to the structure is applied to the plate 10,. When the frictional force between 20 and the friction piece 30 is exceeded, the amount of positional displacement of the upper pillar 1 is reduced by the cable 70 coupled to the vertical pillar.

However, such a conventional damper supports the structure with the same size irrespective of the magnitude of the external force applied to the structure, so that the deformation of the structure cannot be prevented when the external force applied to the structure is large, and the damping force after being mounted on the structure Since it is impossible to control the change of the damping force as the various conditions are changed, there was an inconvenience that the damping force must be adjusted by tightening or releasing the bolt 50 by approaching the damper.

In particular, when the damper having the structure described above is mounted on a large building structure, the damping force adjustment operation is more difficult because the access to the damper is not easy.

The present invention has been made to solve the above problems, the force supporting the structure is changed according to the magnitude of the external force applied to the structure, and provides a damper that can easily change the damping force even after being mounted on the structure. The purpose is to.

Semi-active variable damper for vibration damping of the structure according to the present invention for solving the above problems, the fixed plate is coupled to the structure, the rotating plate coupled to the fixed plate in a rotatable structure around the axis and the center and the interruption portion, It is configured to include a cable wound on the rotating plate and both ends are coupled to the structure, respectively, the distance from the fixed plate is changed.

The rotating plate is formed in a shape in which the contact surface area with the fixed plate is changed in accordance with the rotation angle change, and the friction piece is further provided at a portion where the fixed plate and the rotating plate are contacted and released by the rotation of the rotating plate.

The rotating plate is formed in a disk shape and a seating groove for cable seating is formed on the outer peripheral surface.

In addition, a rheological fluid whose viscosity changes according to the change of the magnetic field by applying power is provided at a portion where the rotating plate and the fixed plate are in constant contact with each other, and a coil for applying a magnetic field to the rheological fluid and a power supply unit for applying power to the coil It is further provided.

At this time, it is preferable that a control unit for controlling the operation of the power supply unit is provided.

One surface of the rotating plate of the portion that is in constant contact with the fixed plate is formed with a fluid groove filled with the rheological fluid.

Hereinafter, an embodiment of a semi-active variable damper for vibration damping according to the present invention will be described with reference to the accompanying drawings.

Figure 3 is an exploded perspective view of the vibration damping semi-active variable damper according to the present invention, Figure 4 is a front view showing the vibration damping semi-active variable damper according to the present invention installed in the structure, Figure 5 is a It is sectional drawing cut along the AA line shown.

3 to 5, the vibration damping semi-active variable damper according to the present invention includes a fixed plate 100 formed in a disk shape and fixed to the upper column 1 by a coupling member J, and a fixed plate. The fluid groove 212 is formed in a disk shape having a diameter larger than 100 and a fluid groove 212 in a predetermined space therein, and the rotation axis is eccentrically spaced upward from the center by the bolt 310 and the nut 320. Rotating plate 200 is coupled to the fixed plate 100 so that the closed, and the cable is coupled to the lower end of the structure in which the end portion is wound on the outer circumferential surface of the rotary plate 200 and both ends are respectively changed the distance from the fixed plate 100 ( 400, a rheological fluid 500 provided in the fluid groove 212, a coil 610 coupled to surround an outer circumferential surface of the rheological fluid 500, and supplying a magnetic field to the rheological fluid 500; The power supply unit for applying power to the coil 610, and the power supply unit It is configured to include a controller 700 for controlling. In this case, the coil 610 is preferably coupled to be spaced apart from the outer wall surface of the fluid groove 212 so as not to be in direct contact with the rheological fluid 500.

The rotating plate 200 is provided with a friction piece 220 so that the contact area with the fixed plate 100 increases in proportion to the rotation about the rotation axis. For example, the rotating plate is provided with a friction piece 220 having a greater frictional force than the rotating plate 200 at the upper edge of the surface in contact with the fixed plate 100. Therefore, as shown in FIG. 4, when the fixed plate 100 and the rotary plate 200 are positioned to coincide with the central axis, the friction piece 220 does not contact the fixed plate 100, but the friction when the rotary plate 200 is rotated. The piece 220 is in contact with the fixed plate 100. In this embodiment, the fixing plate 100 and the rotating plate 200 are formed in a disc shape, but the shapes of the fixing plate 100 and the rotating plate 200 are not limited thereto and may be variously changed. At this time, the coupling position of the fluid groove 212 and the friction piece 220 is not limited to being provided in the rotating plate 200 as shown in this embodiment, it may be provided in the fixed plate 100 plate.

On the other hand, the rheological fluid 500 contained in the fluid groove 212 should not flow out of the rotating plate 200 unless it is released to the combination of the rotating plate 200 and the fixed plate 100. To this end, the shortest distance from the rotating shaft to the outer circumferential surface of the rotating plate 200 should be greater than the longest distance from the rotating shaft to the inner wall of the fluid groove 212. At this time, the power supply unit is configured to include a wire 620 for transmitting a current to the coil 610 according to the control signal of the control unit 700. Therefore, the user may easily friction between the fixed plate 100 and the friction piece 220 by changing the viscosity of the rheological fluid 500 through the control of the control unit 700 even when the fixed plate 100 and the rotating plate 200 are installed in the structure. Can be changed.

The rheological fluid 500 used in the present invention may be applied to various kinds of rheological fluids such as an electron rheological fluid whose viscosity changes with an electric field change or a magnetorheological fluid whose viscosity changes with a magnetic field change. . In this embodiment, a case in which a magnetorheological fluid whose viscosity is changed by a magnetic field change is applied will be described.

In addition, a seating groove 210 for seating the cable 400 is formed on the outer circumferential surface of the rotating plate 200 so that the cable 400 is not separated from the rotating plate 200 when the rotating plate 200 is rotated.

FIG. 6 is a front view illustrating a shape in which the upper end of the structure is inclined to the right in the state shown in FIG. 4, and FIG. 7 is a cross-sectional view taken along the line B-B of FIG. 6.

In the state shown in FIG. 4, when an external force is applied such that the upper pillar 1 of the structure moves to the right and the vertical pillar 2 is inclined clockwise, the distance between the end of the left cable 400 and the rotating plate 200 is far. Since the distance between the end of the right cable 400 and the rotating plate 200 is shortened, the rotating plate 200 is rotated counterclockwise along the cable 400 as shown in FIG. 6.

At this time, since the rotating shaft is positioned at a point spaced upward from the center point, the distance between the center of rotation and the upper end increases as the rotation angle increases. Accordingly, since the tension of the cable 400, that is, the reaction force between the cables 400 pressing the upper end of the rotating plate 200 downward, the force required to rotate the rotating plate 200 is also proportional to the rotation angle of the rotating plate 200. It is gradually increased.

When the external force applied to the structure in the state shown in Figure 6 is released, the rotating plate 200 by the tension of the cable 400 is rotated in a direction that the distance between the upper end and the center of rotation is shortened, thereby the structure It returns to the state shown in FIG.

In addition, as shown in FIG. 6, when the rotating plate 200 rotates, the friction piece 220 and the fixing plate 100 contact each other, and thus a frictional force is generated in a direction of preventing rotation of the rotating plate 200. The frictional force as described above is changed according to the fastening force of the bolt 310 and the nut 320 to couple the fixed plate 100 and the rotating plate 200, and when the rotation angle of the rotating plate 200 is increased, the fixed plate 100 and the friction piece ( Since the area in contact with 220 is increased, the magnitude of the frictional force is also increased in proportion to it.

As described above, in the vibration damping semi-active variable damper according to the present invention, as the rotating plate 200 rotates, frictional force for preventing rotation of the rotating plate 200 and restoring force for returning the rotating plate 200 to an initial state are gradually generated. Therefore, the damping force is automatically changed according to the magnitude of the vibration generated in the structure.

At this time, since the magnitude of the frictional force and the restoring force is an element set before the vibration damping semi-active variable damper is installed in the structure, the vibration damping semi-active variable damper is installed in the structure to absorb the vibration generated in the structure. It is not possible to change the damping force. Accordingly, the vibration damping semi-active variable damper according to the present invention is friction with the fixed plate 100 by changing the viscosity of the rheological fluid 500 by adjusting the size of the power applied to the coil 610 by the controller 700 The friction force between the pieces 220 can be changed.

Since the user can change the friction force between the fixed plate 100 and the rotating plate 200 through the operation of the control unit 700, the damping force can be adjusted even if the semi-active variable damper for vibration damping is not separated from the structure.

As mentioned above, although this invention was demonstrated in detail using the preferable Example, the scope of the present invention is not limited to a specific Example and should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

Semi-active variable damper for vibration damping structure according to the present invention, the force for supporting the structure is changed according to the magnitude of the external force applied to the structure, it is possible to set the basic damping force before mounting the structure and easily even after it is mounted on the structure The advantage is that the damping force can be changed.

Claims (6)

A fixed plate coupled to the structure, A rotating plate coupled to the fixed plate in a rotatable structure about an axis eccentric from the center, Cables having a stopper wound on the rotating plate and both ends being coupled to the same or another structure whose distance from the fixed plate is changed, respectively. Damper, characterized in that comprises a. The method according to claim 1, The rotating plate is formed in a shape in which the contact surface area with the fixed plate is changed according to the rotation angle change, A damper, characterized in that the friction piece is provided at a portion where the fixed plate and the rotating plate contact and release contact by the rotation of the rotating plate. The method according to claim 1, The rotating plate, The damper is formed in the shape of a disk, characterized in that the seating groove for the cable is formed on the outer peripheral surface. The method according to any one of claims 1 to 3, A rheological fluid whose viscosity is changed in accordance with a magnetic field change is provided at a portion where the rotating plate and the fixed plate are in constant contact with each other. A coil for supplying a magnetic field to the rheological fluid as power is applied, And a power supply unit for applying power to the coil. The method according to claim 4, And a control unit for controlling the operation of the power supply unit. The method according to claim 4, The rotating plate, the damper, characterized in that the fluid plate is formed in the fixed plate or the fixed fluid is filled with the rheological fluid.

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