JPH06288119A - Vibration control device for structure - Google Patents

Abstract

PURPOSE:To increase the amount of displacement by supporting an additional mass body by means of a supporting mechanism on the bearings of a structure on which linear guides are doubly combined, and by engaging pinions with racks, so that the additional mass body can be displaced in arbitrary directions. CONSTITUTION:A restoring force is given to an additional mass body 3 by means of a restoring mechanism consisting of coil springs 4 that have been arranged in the additional mass body 3 for imparting a natural frequency. Vibrational energy is absorbed by a damping mechanism consisting of oil dampers 12 for imparting a damping force to the additional mass body. The additional mass body 3 is supported by a supporting mechanism in which linear guides 2, 2' are doubly combined in the X and Y directions, and also the additional mass body 3 is made horizontally movable in the X and Y directions. In the case of a typhoon or an earthquake, after receiving the detection signal thereof, the servomotor 6 of an actuator is started, and required velocity, acceleration, and displacement are given to the additional mass body 3 through clutches 8, pinions, and racks 10. By separating the clutches 8, the vibration control device can be functioned as a passive mass damper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control system for structures against wind and earthquake.

[0002]

2. Description of the Related Art In an active mass damper and a hybrid mass damper in which an active mass damper and a chained mass damper are combined, (a) a suspension system as a support mechanism for an additional mass (Pendulum method), (b) multi-stage laminated rubber method, etc. are configured by (b) an actuator for driving the additional mass, (a) electro-hydraulic actuator, (b) servo motor + ball screw, etc.

[0003]

In (a) the suspension system of the additional mass supporting mechanism of (a), the vertical movement of the additional mass occurs in the suspension system, and in the case of a long cycle, the height of the device itself increases, and (B) The horizontal deformation amount is limited in the multi-stage laminated rubber system. Further, (a) the electrohydraulic actuator in the actuator for driving the additional mass in (b) has a high initial cost, and it takes a long time to start. In (b) the servomotor + ball screw, the equivalent mass of the ball screw in the passive state is large, and the frictional resistance is also amplified.

The present invention has been proposed in view of the above problems of the prior art. The object of the present invention is to provide excellent workability, excellent maneuverability, good passive performance, and reduced initial cost. The point is to provide a structure vibration damping device.

[0005]

In order to achieve the above-mentioned object, a structure vibration damping device according to the present invention comprises a single unit or a plurality of units in which an additional mass and a linear guide are combined in two stages in the XY directions. A support mechanism for the additional mass installed on the base of the structure, a pinion mounted via a clutch on the output shaft of the speed reducer of the servo motor arranged on the side of the additional mass, and a reaction force to the structure The actuator is composed of a rack mounted so as to transmit power, and a restoring force mechanism and a damping mechanism for the additional mass.

[0006]

Since the present invention is constructed as described above,
Set the linear guide in the support mechanism to 2 in the X and Y2 directions.
The unit constructed by combining the stages supports the load of the additional mass by the support mechanism of the additional mass installed on the base of the structure, and allows one additional mass to move freely along the horizontal X and Y axes. Along with the linear guide X, Y2
By combining two stages in the direction, it has a large rigidity and has a torsional strength for making the torsional deformation (rotational angle) to zero against an unexpected torsional force (rotational force) generated in the additional mass. In addition, the horizontal mounting accuracy between each unit is not required, and the workability is excellent.

When a detection signal is received at the time of a typhoon or an earthquake, the servomotor of the actuator is immediately activated, and the pinion mounted on the output shaft side of the motor via the clutch meshes with the rack and is desired for the additional mass. Gives the velocity, displacement, and acceleration of. By disengaging the clutch, it can function as a passive mass damper. Further, the restoring force mechanism gives a restoring force to the additional mass to have a natural period, and the damping mechanism consumes vibration energy to give a damping force to the additional mass.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention applied to a horizontal two-way hybrid mass damper will be described below. In consideration of workability and workability, the additional mass is supported by using four sets of unit 2u, which is a combination of a linear guide 2 in the X direction and a linear guide 2'in the Y direction in two steps on the base 1 of the structure. A mechanism is installed, and the additional mass 3 is installed on the support mechanism so as to be movable in two degrees of freedom in the XY axes.

Reference numeral 4 denotes a coil spring as a restoring mechanism for the additional mass 3, which is mounted horizontally between the additional mass 3 and a reaction force receiver 5 which stands vertically from the base 1. The actuator mounts a servomotor 6, a speed reducer 7, and a clutch 8 and a pinion 7 provided on the output shaft of the speed reducer 7 in series, and a rack 10 that meshes with the pinion 9 is attached to a beam 11 having high rigidity. ing. One end of the beam 11 is slid in a direction perpendicular to the member direction on a reaction force receiver 5 which is erected vertically from the base 1, and is connected by linear guides 2b and 2b 'so that the axial force of the member is transmitted to the structure. ing. Further, in order to remove the stress generated in the beam due to the bending of the slab of the structure due to the movement of the additional mass 3, a mechanism for sliding up and down may be provided in the member. In this case, a vertically movable bearing is used. , The actuators are arranged in different vertical positions and in the orthogonal direction.

Reference numeral 12 is an oil damper as a damping mechanism.
An oil damper whose damping force is approximately proportional to the square of the speed,
Alternatively, an oil damper that can switch the damping force is used. In the figure, 13 is a buffer and 14 is a stress relaxation mechanism. Since the illustrated embodiment is constructed as described above, the servomotor 6 is immediately activated upon receipt of an earthquake detection signal, and the additional mass 3 is transferred to the linear guides 2 and 2'via the pinion 9 and the rack 8. Along with that, the required speed, displacement, or acceleration is given to achieve the desired damping effect.

Thus, the coil spring 4 gives a restoring force to the additional mass to give it a natural period. Also oil damper 12
Consumes the vibration energy and gives a damping force to the additional mass. By disengaging the clutch 8, the actuator acts as a passive mass damper.
The above embodiment shows the case where the hybrid mass dampers are arranged in two horizontal directions. When the one-way hybrid mass damper and the other-direction passive mass damper are arranged, the actuator is installed only in one direction. To do. If the hybrid mass damper is installed only in one direction,
The linear guide unit 2u is not necessary, and a linear guide in one direction, a coil spring having two surfaces in the same direction, a damping mechanism in the same direction, and an actuator in the same direction are installed.

[0012]

As described above, according to the present invention, the additional mass is supported by the supporting mechanism on the bearing of the structure in which the linear guides are combined in two stages in the XY directions, and the servo motor disposed on the side of the additional mass is supported. By engaging the pinion mounted on the output shaft of the reducer via the clutch with the rack,
By allowing the additional mass to be displaced in any direction, a large amount of displacement can be obtained, and rotational movement does not occur with respect to the structure.

Further, the actuator mounts the pinion through the output shaft of the speed reducer of the servo motor, and the pinion is meshed with the rack, so that the actuator is quickly started and the clutch is disengaged. It can function as a passive mass damper with low friction resistance and good performance. In addition, the restoration mechanism optimizes the natural period of the passive mass damper, and also consumes vibration energy by the damping device and prevents excessive displacement of the additional mass when functioning as a passive mass damper. It is a thing.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a structure vibration damping device according to the present invention.

FIG. 2 is an elevation view seen from the direction A in FIG.

FIG. 3 is an elevation view seen from the direction B in FIG.

FIG. 4 is a perspective view of the device of the present invention.

FIG. 5 is a plan view showing an arrangement of linear guide units according to the present embodiment.

FIG. 6 is a plan view showing another arrangement example of the linear guide unit.

[Explanation of symbols]

 1 Base 2 X-direction linear guide 2'Y-direction linear guide 2a Linear guide 2a 'Linear guide 2b Linear guide 2b' Linear guide 2u Linear guide unit 3 Additional mass 4 Coil spring 5 Reaction force reception 6 Servo motor 7 Speed reducer 8 Clutch 9 Pinion 10 Rack 11 Support member 12 Oil damper 13 Buffer 14 Stress relaxation mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuharu Hirasawa 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Co., Ltd. (72) Hidemi Oyama 4-6-15 Sendagaya, Shibuya-ku, Tokyo Company Fujita (72) Inventor Yoshiya Nakamura 4-6-15 Sendagaya, Shibuya-ku, Tokyo Stock Company Fujita (72) Inventor Nobuyuki Arai 4-6-15 Sendagaya, Shibuya-ku, Tokyo Company Fujita (72) Inventor Masaru Ishii 4-6-15 Sendagaya, Shibuya-ku, Tokyo Within Fujita Co., Ltd. (72) Inventor Kazuya Murakoshi 4-6-15 Sendagaya, Shibuya-ku, Tokyo Within Fujita Co., Ltd. (72) Inventor Hiroshi Miyano 1-9-31 Shinonome, Koto-ku, Tokyo Mitsubishi Steel Co., Ltd. (72) Inventor Koichi Dou 1-9-31 Shinonome, Koto-ku, Tokyo Mitsubishi Steel Co., Ltd. (72) Inventor Hiroshi Kurabayashi 1-9-31 Shinonome, Koto-ku, Tokyo Mitsubishi Steel Co., Ltd. (72) Inventor Toshio Omi 1-9-31 Shinonome, Koto-ku, Tokyo Mitsubishi Steel Co., Ltd. (72) ) Inventor Takashi Fujita 575-28 Hisagi Nakano Nagareyama City, Chiba Prefecture

Claims (6)

[Claims] 1. An additional mass in which a restoring mechanism and a damping mechanism are respectively arranged in an orthogonal direction, a supporting mechanism for an additional mass in which linear guides are combined in two stages in a horizontal orthogonal direction, a servomotor and a rack. An actuator driven by a pinion and arranged in one direction or in a direction orthogonal to each other, and an additional mass and a supporting mechanism or a mass damper composed of the additional mass and the supporting mechanism and an actuator are arranged on a structure. A structure vibration damping device characterized by being installed. 2. The vibration damping device for a structure according to claim 1, wherein a coil spring is used for the restoring mechanism. 3. The structure vibration damping device according to claim 1, wherein an oil damper is used for the damping mechanism. 4. The structure vibration damping device according to claim 1, further comprising a speed reducer coupled to the servo motor of the actuator. 5. The vibration damping device for a structure according to claim 1, wherein a clutch is mounted on an input side of the pinion of the actuator. 6. The vibration damping device for a structure according to claim 1, wherein the support mechanism uses one stage or a plurality of units in which linear guides are combined in two stages in an orthogonal direction.