JPS5989849A - Vibration control device - Google Patents

Abstract

PURPOSE:To control biaxial vibrations in a horizontal plane, by driving and controlling, in association with a vibration signal from vibration detectors, an additional weight which may be horizontally moved by either one of two actuators having their driving directions at right angles to each other. CONSTITUTION:Linear guide bearings 30a, 30b connect between an additional weight 24 and couplings 22a, 22b, and allows the weight 24 to freely move in the directions which are right angles to the driving directions of the couplings 22a, 22b. The components of vibrtions are detected by vibration detectors 2a, 2b. For example, with respect to vibrations in the direction of X-axis, a signal from the vibration detector 2a is delivered to a control circuit 3a to convert it into a displacement value, a speed values, etc. which are necessary for damping the X- axial vibrations of a building 1. An actuator 20a produces drive force through a power source in assocation with signals obtained by the computation of the control circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration control device used for seismic isolation or damping of structures.

Fig. 1 is a basic configuration diagram showing a general vibration control device, and Fig. 2 is a conventional configuration diagram of a vibration control device. FIG. 2 is a cross-sectional view of the structure of the type additional bell drive device. In the figure, when a structure 1 to be subjected to vibration control vibrates in the horizontal direction due to an external force such as an earthquake or wind load, this vibration is detected as an electrical signal by a vibration detector 2 attached to the structure 1Vc.

The electrical signal from the detector 2 is applied to the control circuit +3+ and converted into a required amount of vibration displacement or vibration velocity.

Corresponding to these quantities, the actuator 2OJC generates a driving force that moves the additional weight 24 in a vibrating state via the drive portion 21, the coupling 22, and the connecting rod 26 of the actuator 20. This driving force is applied to the structure 1 via the mount 25 and the pedestal 26 on which the actuator 20 is mounted, based on the principle of action and reaction. When the control circuit 6 is set so that this driving force opposes the vibration of the structure 1, the vibration of the structure 1 is extremely attenuated, and the device functions as a vibration control device. In addition, 27 is a bearing support stand,
28 is a linear rolling bearing, 29 is a connecting rod, and 2
6 is a frame for fixing the bearing support 27 and the fixture 25;
It is installed at the edge or ceiling of the structure 1.

In the above-mentioned 5'fx conventional additional weight drive device 4, the additional weight 24 is only driven in one direction shown by the arrow in the figure, and has no distribution effect at all against vibrations in the right angle direction. There were drawbacks such as:

The present invention was made to solve the above-mentioned drawbacks, and an object of the present invention is to obtain a vibration control device that controls vibrations in two axial directions in a horizontal plane.

In order to achieve the above object, the present invention provides an additional weight consisting of two actuators whose drive directions are perpendicular to each other and one additional weight capable of horizontal movement attached to the drive section of each of the actuators. A drive device, a control/control circuit that drives the actuator in response to vibrations of the structure and moves the additional weight, and a vibration detector that detects vibrations in the drive direction of the actuator are mounted on the structure, The present invention provides a vibration control device that reduces vibration of a structure by using a vibration signal from a vibration detector as input to the control circuit. The present invention will now be explained below using the drawings. Note that the same symbols are used for parts with the same functions as in FIGS. 1 and 2, and their explanations are omitted, and symbols a and b are used to clarify the X-axis direction and the Y-axis direction.

FIG. 6 is a plan view of the embodiment of the present invention, in which 30aw 30b connects the additional weight 24 and the couplings 22a, 22b, and connects the additional weight 24 in the direction perpendicular to the driving direction of the couplings 22a, 22b. A linear guide bearing that allows free movement. FIG. 4 is a sectional view taken along the line A-A in FIG. 6, and 61 indicates an additional weight support base that allows the additional weight 24 to move freely in the horizontal plane by two linear guide bearings 30at and 30h K that are perpendicular to each other. . FIG. 5 is a block diagram of an embodiment of the present invention.

Next, the present invention configured as described above will be explained in detail. As shown in FIG. 1, when the structure 1 vibrates in response to an external force such as an earthquake or wind load, the vibration of the structure 1 is divided into two components perpendicular to each other in the horizontal plane. This vibration component is detected by vibration detectors 2a+2b as shown in FIGS. 6 and 5.
is detected as an electrical signal. For vibrations in the X-axis direction, the signal from the vibration detector 2a is input to the control circuit 3a,
It is converted into the amount of displacement or velocity required to dampen the vibration of the structure 1 in the X-axis direction. A driving force is generated in the actuator 20a via the power source 5a in response to the signal obtained by the calculation of the control circuit 3a. This driving force vibrates the additional weight 24 in the X-axis direction via the movable portion 21a, the coupling 22a, and the drive rod 23a'l. The vibration in the Y-axis direction is not based on the same principle as the operation principle in the X-axis direction. In the drive of
It is applied to the structure 1 via 25b. Additional weight 24
is attached to the additional bell support stand 31 as shown in FIG. 4, so it can move freely in the horizontal plane.

On the other hand, the force ring 22a includes a guide bearing 30a,
It is coupled to the additional weight 24 via the coupling 22m, 22b, and is not affected by the movement of the additional weight 24 in the direction perpendicular to the couplings 22m, 22b. For this reason, the X-axis direction and the
Since the axial movements are not coupled, they can be controlled independently.

In the above explanation, the case where the additional weight is supported by a support base that can freely move in a plane has been shown, but it may also be supported by a hydrostatic air film bearing or the like. Vibration in two directions can be controlled independently and simultaneously, and the weight of the device can be reduced.

[Brief explanation of drawings]

Fig. 1 is a basic configuration diagram showing a general vibration control device, Fig. 2 is a longitudinal sectional view showing a conventional additional weight driving device, and Fig. 6 is a plan view showing an example of the additional weight driving device of the present invention. Figure, 4th
The figure is a sectional view taken along the line AA in FIG. 6, and FIG. 5 is a block diagram of an embodiment of the present invention. 1...Structure 2...Vibration detector 6...Control circuit 20a, 20b...Actuator 24...Additional hammer agent Makoto Kazuno-

Claims (1)

[Claims] Driving direction force 5 - an additional bell drive device consisting of two actuators perpendicular to each other and one additional weight capable of horizontal movement attached to the drive part of each actuator;
A control circuit that drives the actuator and moves the additional weight in response to vibrations of the structure, and a vibration detector that detects vibrations in the driving direction of the actuator are attached to the structure, and the vibration from the vibration detector is mounted on the structure. A vibration control device that reduces vibration of a structure by using a vibration signal as an input to the control circuit.