JPH0434185A - Damping device - Google Patents

Abstract

PURPOSE:To alleviate the quake of a building by providing a rotary bed so laid on a damping object as to be rotatable about an axis parallel to the axial line of the object, and a synchronous mass damper or synchronous liquid damper on the rotary bed. CONSTITUTION:A plurality of rollers 16 are arranged on the lower surface of a rotary bed 12 at intervals in a peripheral direction, and a rod-shaped positioning member 18 is provided in a building A. When the rotary bed 12 is given torque, the rollers 16 rotate about a radial axial line, and the bed 12 rotates about the positioning member 18. Then, a synchronous mass damper 14 laid on the rotary bed 12 is fitted with a weight 20 having approximately 1% weight of the building A, a hydraulic damper 22 connected to the weight 20 and the rotary bed 12, and a plurality of spring members 24. According to the aforesaid construction, the quake of the building A can be alleviated, due to the vibration attenuation of the weight 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vibration damping device for mitigating the shaking of an object to be damped, such as a building, which sways due to external forces such as wind pressure or seismic force. .

(Prior Art) Tuned mass dampers or tuned liquid dampers installed in buildings are known as vibration damping devices that utilize resonance phenomena to alleviate the shaking of buildings.

(8 Problems to be Solved by the Invention) The tamper is effective only in alleviating shaking in straight-line directions such as east-west and north-south directions. Therefore, in order to damp vibrations in a plurality of non-parallel straight line directions, it is sufficient to install the same number of tampers as the straight lines.

However, the mass of the weight of the tamper or the weight of the liquid necessary for damping vibration in the -linear direction is approximately 1% of the weight of the building. For this reason, if dampers are installed in multiple linear directions, an excessive load will be applied to the structural members of the building, and a large space will be required to install the multiple dampers.

The purpose of the invention is to make a pedestal tuned mass damper or tuned liquid damper sufficient for damping in multiple linear directions.

(Means for solving the problem) A vibration damping device according to the present invention is installed on a vibration damping object, and
The vibration damping device includes a rotary table rotatable around an axis parallel to the axis of the object to be damped, and a tuned mass damper or a tuned liquid damper installed on the rotary table.

Furthermore, the vibration damping device can be provided with a drive device for rotating the rotary table around the axis.

(Operations and Effects of the Invention) According to the present invention, the tuned mass damper or the tuned liquid damper on the rotary table can be directed in any linear direction by rotating the rotary table. For this reason, for example, for shaking of a building in any direction that requires vibration damping, it is possible to dampen it using a tuned mass damper or a tuned liquid damper.

The rotary table can be rotated using a drive device.

(Example) Referring to the first embodiment and FIG. 2, a vibration damping device according to the present invention is indicated by the reference numeral 10 as a whole.

In order to obtain a higher vibration damping effect, the vibration damping device 10 is desirably installed at a high place such as the roof of the building A or the floor of the top floor of the object to be damped.

The damping device 10 includes a disc-shaped rotating table 12 and a tuned mass damper 14 arranged on and fixed to the rotating table 12.

A plurality of rollers 16 are arranged on the lower surface of the rotary table 12 in a radial direction from the center of the rotary table 12 and at intervals in the circumferential direction, and each roller 16 is rotatable around its axis. It is supported by a rotating table 12 as shown in FIG. The building A is provided with a rod-shaped positioning member 18 that rises upward from the building parallel to its axis, and the positioning member 18 extends within a hole provided at the center of the rotary table 12. Therefore, when a rotational force is applied to the rotary table 12, the roller 16 rotates around its radial axis, and the rotary table 12
rotates around the positioning member 18 during this time.

The tuned mass damper 14 includes a block-shaped weight 20 having a weight of approximately 1% of the weight of the building A, the weight 20 and a rotary table 1.
2, a plurality of hydraulic dampers 22, and a plurality of spring members 24.

The weight 20 is placed on a plurality of rollers 26 arranged approximately at the center of the rotary table 2 at intervals.

The roller 26 is a pair of support plates 2 fixed to the rotating table 12.
8 is rotatably supported. Therefore, when an external force is applied to the weight 20 in the direction of the arrow 30, the roller 26 in contact with the weight 20 rotates around its axis, and the weight 20 moves in the direction of the arrow.

A pair of support plates 32 are arranged on both sides of the weight 20 in parallel with the roller 26 and are fixed to the rotating table 12. A plurality of hydraulic dampers 22 and a plurality of spring members 24 are arranged between each support plate 32 and the weight 20, and both ends of each are connected to each support plate 32 and a side of the weight 20.

Therefore, the weight 20 can reciprocate (vibrate) in the direction of the arrow 30 under the action of the spring member 24, and the vibration is damped by the damping action of the hydraulic damper 22.

When building A shakes in the direction of arrow 30 due to earthquake force or wind pressure, the weight 20, which is set to have the same natural vibration period as building A, resonates, and the vibration damping of the weight 20 causes the building A to shake. is alleviated.

3 and 4, instead of the tuned mass damper 10,
An example in which a tuned liquid damper 32 is attached to a rotary table 12 is shown. The illustrated tuned liquid damper consists of a liquid column damper containing a liquid 36, such as water, in a generally U-shaped container 34.

When building A shakes, both liquid levels move up and down. That is,
The liquid 36 resonates with the shaking of the building A. The vibrations of the liquid 36 are damped by the friction created between the liquid 36 and the container 34, thereby reducing the shaking of the building. In order to increase the attenuation rate, a communication section 40 that connects both columnar sections 38 is usually provided.
is additionally provided with an orifice (not shown).

In either example, by rotating the turntable 12, the tuned mass damper 10 and the tuned liquid damper 32 can be directed in directions in which they act to alleviate the shaking of the building A, respectively. The tuned mass damper 10 and the tuned liquid damper 32 each have a plurality of units facing the same direction on the rotary table 1, instead of the illustrated example in which the two units are arranged.
It can be placed on 2. At this time, the total weight of the multiple tuned mass tampers and the total weight of the liquid of the multiple tuned liquid dampers are each approximately 1% of the weight of Building A.
is set to

The rotating table 12 can be rotationally driven using a motor 42, for example. In the illustrated example, the motor 42 is supported by the building A via a bracket 44, and the output shaft of the motor 42 is oriented in the vertical direction. The output shaft of the motor 42 is provided with a disc-shaped rubber roller 4 that comes into contact with the circumferential surface of the rotary table 12.
6 is installed. By operating the motor 42 and rotating the rubber roller 46, the rotary table 12 in contact with the rubber roller 46 can be rotated by an arbitrary angle.
By stopping the operation of the motor 42, the rotary table 12
The angular position of the device can be maintained. Rubber roller 46
Instead of using the gear, it is possible to use the stiffener as a gear and provide teeth that mesh with the gear on the circumferential surface of the rotary table 12.

The rotation angle of the rotating table 12 is determined by a vibration meter 48 installed in building A.
The detection data of the shaking of the building A is sent to the control device 50, the control device 50 analyzes the direction of the shaking of the building A, and the result is sent from the control device 50 to the motor 44, so that the output shaft of the motor 42 rotates at a predetermined speed. This can be determined by controlling the motor 42 to rotate several times.

If the purpose of installing the vibration damping device 10 is only to alleviate the shaking of the building A due to wind force, the wind vane 5 may be used instead of the vibration meter 48.
2 is installed, and based on the detection data of the wind vane 52, the rotation angle of the output shaft of the motor 42 can be determined via the control device 50, and the rotation angle of the rotary table 12 can be determined.

[Brief explanation of the drawing]

1 and 2 are a front view and a plan view of a vibration damping device according to the present invention, and FIGS. 3 and 4 are a front view and a plan view of another example of a vibration damping device. 10: Vibration damping device, 12: Turntable, 14: Tuned mass damper, 20: Weight, 32: Tuned liquid damper, 36: Liquid, 42: Motor (drive device), A: Building (vibration damping object). Figure 1

Claims (2)

[Claims] (1) A rotary table installed on a vibration-damping object and rotatable around an axis parallel to the axis of the vibration-damping object, and a tuned mass damper or a tuned liquid damper installed on the rotary table. , vibration damping device. (2) The vibration damping device according to claim (1), further comprising a drive device for rotating the rotary table around the axis.