JPH05256047A - Vibration damper - Google Patents

Abstract

PURPOSE:To firmly settle a drive device oscillating a vibration-damping body without influences by the oscillating displacement of the vibration-damper. CONSTITUTION:A vibration damper 5 is suspended in the upper construction member 1a of a support structure 1 by a first metal cross 2 to be freely movable through a suspension arm 4. And an actuation lever 10 is suspended by a metal cross 3 to be freely movable at the adjacent position of the first metal cross 2. The actuation lever 10 is movable together with the suspension arm 4. The axes of respective metal crosses 2, 3 in the different directions from each other are moved up and down by the drive device to oscillate the vibration damper 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is attached to the upper part of a structure such as a tower of a suspension bridge, a super high-rise building, a tower, a steel tower, etc. to suppress the vibration of these structures due to wind load (aerodynamic force) and the vibration amplitude due to an earthquake. The present invention relates to a vibration damping device used to quickly damp vibrations.

[0002]

2. Description of the Related Art As this type of vibration damping device, the vibration energy applied to a structure is converted into the kinetic energy of a weight by applying the principle of a simple pendulum, and the vibration of the structure is efficiently damped. Various proposals have been made to reduce the number.

A damping device applying the principle of the above simple pendulum,
As shown in an example in FIGS. 4 and 5, a vibration damper (weight) b is suspended from an upper part of the support frame a by a suspension arm c and cross hinges d.
It is oscillatably suspended via a cylinder e, between the damping body b and the side portion of the support frame a as a drive device in the front-rear direction (Y direction) and the left-right direction (X direction), respectively. f
It is configured to intervene.

In such a vibration damping device, since the cross hinge d is used at the suspension point of the vibration damping body b, the phase is shifted by 90 degrees with respect to the vibration of the structure, and the vibration is unidirectionally moved in both front and rear and left and right directions. String vibration can be performed. At this time, by damping the vibration of the vibration damper b by the cylinders e and f,
It is possible to quickly suppress the front-back and left-right sway of the structure.

[0005]

However, in the case of the above-described conventional vibration damping device in which the vibration damping body b is directly pushed and pulled by the cylinders e and f, the vibration damping body b swings in the vertical direction. Therefore, the cylinders e and f must be able to be displaced by directly following in the vertical direction, and as shown by the chain double-dashed line in FIG. At times, since the cylinders e and f must be able to be displaced by directly following each other even in an oblique direction, universal mounting is required for all the mounting portions of the cylinders e and f, and there is a problem that the structure becomes complicated. As mentioned above
Since the cylinders e and f are displaced vertically and diagonally, it is difficult to control the stroke accurately.
Since f is installed in the front-rear direction and the left-right direction, there is a problem that the entire plane space of the apparatus becomes large.

There is also a type in which the vibration damper is moved along the screw shafts arranged in the front-rear direction and the left-right direction, but in this case as well, a slide mechanism for absorbing the vertical displacement of the vibration damper. However, there is a problem that the structure becomes complicated.

In view of this, the present invention enables the drive device to be fixedly installed without being affected by the swing displacement of the vibration-damping body, thereby simplifying the structure and allowing accurate swing stroke control, and the entire device. It is intended to be able to reduce the plane space of.

[0008]

In order to solve the above problems, the present invention arranges a first cross fitting and a second cross fitting having a structure in which two axes are orthogonal to each other on the same straight line and in the same direction. , One of the shafts having different directions is supported by an upper structural member that constitutes a support frame, and the vibration damping body is swingably hung on the other shaft of the first cross fitting through a suspension arm. An operating lever is swingably suspended on the other shaft of the second cross fitting so that the working lever and the suspension arm are interlockingly coupled, and the first cross fitting and the second cross fitting are connected to each other. A driving device for rotationally displacing the other shaft in the vertical direction is installed on each of the support frames.

[0009]

[Operation] Since the vibration control body is suspended by the cross fitting so that it can swing freely, swinging of the structure in the front-rear and left-right directions can be quickly suppressed. At this time, since the vibration of the vibration damper is obtained by vertically rotating the shaft of the cross fitting, the drive device for rotating the shaft in the vertical direction is designed to move the vibration displacement of the vibration damper. It will not be affected.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present invention, in which a front and rear shaft 2a is provided at the upper center of a supporting frame 1 of a frame structure assembled from an upper structural member 1a and a side structural member 1b. The first cross fitting 2 having the left and right shafts 2b is arranged so that the left and right shafts 2b, which are one of the shafts, are supported by the upper structural member 1a, and the front and rear shafts 2a, which are the other shafts, support the suspension arm 4 The vibration damping body (weight) 5 is hung through the one end of the front-rear shaft 2a, and the arc-shaped sector gear 6 centered on the left-right shaft 2b is attached to the extended end.
A pinion 7 is meshed with the sector gear 6, and the pinion 7
Is attached to the shaft of a motor 9 which is a drive device on a pedestal 8 fixed to the side structural member 1b, and the pinion 7 is rotated by the drive of the motor 9 to move the front-rear shaft 2a through the movement of the sector gear 6. The left and right shafts 2b are rotated about a fulcrum so that the vibration damper 5 can be swingably driven in the front-rear direction (Y direction) via the suspension arm 4.

Further, a second cross fitting 3 having a front and rear shaft 3a and a left and right shaft 3b is arranged at a position on an extension line of the first cross fitting 2 in the direction of the left and right shafts 2b, and one of the front and rear shafts is formed. 3a side is supported by the upper structural member 1a, the operating lever 10 is hung on the other side of the left and right shafts 3b, and the lower end of the operating lever 10 and the hanging arm 4 are arranged in the left-right direction. So that the actuating lever 10 can be swung in the front-rear direction integrally with the suspension arm 4 about the left-right shaft 3b as a fulcrum.
Moreover, one end of the left and right shaft 3b is extended to the extended end,
A sector gear 12 having an arc centered on the front-rear shaft 3a is attached, and a pinion 13 is meshed with the sector gear 12,
A pedestal 14 in which the pinion 13 is fixedly mounted on the side structural member 1b.
It is attached to a shaft of a motor 15 which is an upper drive device, and the pinion 13 is rotated by driving the motor 9, whereby the left and right shafts 3b are rotated about the front and rear shafts 3a as a fulcrum via the movement of the sector gear 12. Turning lever 3b actuates lever 10
To the suspension arm 4 via the link 11 so that the vibration damper 5 can be swung in the left and right directions (XY directions). In addition, 16 in a figure shows a structure.

If the structure 16 is installed on the top of the structure 16 and an earthquake or an aerodynamic force causes the structure 16 to shake in the front-rear direction, for example, a shake (not shown) When detected by the detection sensor, the motor 9 is driven in a predetermined direction based on the detection signal to rotate the pinion 7, and the pinion 7 is rotated.
Since the sector gear 6 that meshes with the vertical movement is moved in the vertical direction, the front-rear shaft 2a of the first cross fitting 2 is rotated around the left-right shaft 2b as a fulcrum, and as a result, the front-rear shaft 2a is suspended by the suspension arm 4 via the suspension arm 4. The vibration damper 5 thus swung is swung so as to vibrate in the front-rear direction by a single string with the left and right shafts 2b as fulcrums. Therefore, at this time, the rocking of the vibration damping body 5 is actively repeated so that the phase of the vibration of the vibration damping body 5 is 90 degrees out of phase with the rocking of the structure 16, whereby the rocking of the structure 16 in the front-rear direction is effectively damped. ..

On the other hand, when the structure 16 sways in the left-right direction, the motor 15 is driven in the same manner, and the driving force thereof is driven by the pinion 13, the sector gear 12, and the second cross fitting 3.
By being transmitted to the left and right shafts 3b, the operating arm 10 suspended by the left and right shafts 3b is rotated about the front and rear shafts 3a, and the rotational power is transmitted from the link 11 to the suspension arm 4. By vibrating the damper 5 in the left-right direction with the front-rear axis 2a of the first cross member 2 as a fulcrum and shifting the phase of the structure 16 by 90 degrees with respect to the vibration of the structure 16, the structure 16 is shaken in the left-right direction. Effectively damped.

As described above, in the present invention, the damping body 5 suspended and supported by the first cross fitting 2 supported by the upper structural member 1a of the support frame 1 via the suspension arm 4 is connected to the motor 9, Since the shafts 2a and 3b can be swung in the up-down direction and the left-right direction by driving the shaft 15 in the vertical direction, swing in any horizontal direction can be dealt with.

In the above, the pinions 7 and 13 are rotated by the motors 9 and 15 to move the sector gears 6 and 12, and the front and rear shafts 2a of the first cross fitting 2 and the second cross fitting 3 are moved.
Since the vibration damping body 5 is swung by vertically rotating the left and right shafts 3b of the motor 3, the motors 9 and 15 as the driving device can be fixedly installed on the support frame 1. The structure is simple as compared with the case where the cylinders e and f as drive devices are displaceably installed as in the conventional device shown in FIGS. 4 and 5, and the swing stroke control of the vibration damper 5 is also easy. And be accurate. Further, since the arc radii of the sector gears 6 and 12 can be arbitrarily selected, the plane space of the entire device can be made smaller than that of the cylinder direct-acting system.

In the above embodiment, the terms "front and rear axis" and "left and right axis" are used for the cross fitting for convenience of description, but it is sufficient if the two axes are two-dimensionally orthogonal to each other in a cross shape. In the embodiment, the case where the motor is used to rotate the shaft of the cross fitting in the vertical direction has been shown, but a hydraulic cylinder or a screw mechanism may be used, and other aspects of the invention are not deviated. It goes without saying that various changes can be made within the range.

[0018]

As described above, according to the vibration damping device of the present invention, the suspension arm of the vibration damping body suspended and supported by the first cross fitting and the operation lever suspended and supported by the second cross fitting. Since the shafts of the first cross fitting and the second cross fitting are pivotally moved in the vertical direction by the drive device, the vibration damping body can be rockably driven. The drive unit can be fixedly installed without being affected by the swing displacement of the body, which allows the swing stroke of the vibration damping body to be accurately controlled with a simple structure, and can be applied to the structure in the front-back, left-right direction. It is possible to suppress the swaying of the device quickly and to design the plane space of the entire device to be small.

[Brief description of drawings]

FIG. 1 is a front view showing an outline of an embodiment of a vibration damping device of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a schematic front view showing an example of a conventional vibration damping device.

FIG. 5 is a plan view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support frame 1a Upper structural material 2 1st cross metal fitting 2a Front-rear shaft (other shaft) 2b Left-right shaft (one shaft) 3 2nd cross metal fitting 3a Front-rear shaft (one shaft) 3b Left-right shaft (other shaft) 4 Suspension arm 5 Damper 9 Motor (driving device) 10 Actuating lever 15 Motor (driving device)

Claims (1)

[Claims] 1. A first cross fitting and a second cross fitting having a structure in which two axes are orthogonal to each other are arranged on the same straight line in the same direction, and one shaft side having a different direction from each other constitutes a supporting frame. The damping member is supported by the upper structural member and oscillated to be swingable on the other shaft of the first cross fitting through a suspension arm, and the operating lever is swung on the other shaft of the second cross fitting. Drive device for freely suspending, connecting the operating lever and the suspension arm in an interlocking manner, and rotationally displacing the other shafts of the first cross fitting and the second cross fitting in the vertical direction. A vibration damping device having a structure in which each of the above is installed on the supporting frame.