JPH10184098A - Vibration damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damper, by which a large damping effect is acquired by using a small-sized expansion actuator having a small stroke. SOLUTION: In the vibration damper, an added mass body 4 is supported to a structure 1 in a displaceable manner while an expansion actuator 2 controlling the displacement of the structure 1 is interposed between the structure 1 and the added mass body 4. An amplifying mechanism 3 expanding the displacement of the expansion actuator 2a and transmitting the expanded displacement to the added mass body 4 is interposed between the added mass body 4 and the expansion actuator 2a at that time. Accordingly, since the displacement of the expansion actuator 2a is magnified by the amplifying mechanism 3 and transmitted to the added mass body 4, a large damping effect can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device which suppresses vibration of a structure by moving an additional mass body using a telescopic actuator.

[0002]

2. Description of the Related Art Conventionally, a telescopic actuator having one end fixed to a structure, a movable additional mass body fixed to the other end of the telescopic actuator, an acceleration sensor for detecting vibration of the structure, and an acceleration sensor 2. Description of the Related Art There is known a vibration damping device including a control device that controls an operation of a telescopic actuator in accordance with a detected vibration of a structure, and the vibration damping device is installed on a top of the structure. In the above vibration damping device,
When the structure vibrates, a signal from an acceleration sensor attached to the structure is transmitted to the control device, and the control device receiving the signal outputs an output corresponding to the acceleration of the vibration generated in the structure to the telescopic actuator. The vibration of the structure is suppressed by moving the additional mass body in the vibration direction of the structure.

[0003]

In the above-described vibration damping device, when the acceleration sensor detects a large vibration of the structure, it is necessary to largely move the additional mass body in order to increase the vibration damping effect. Then, it is necessary to increase the stroke of the telescopic actuator, and there is a problem that the telescopic actuator becomes large.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration damping device that can obtain a large vibration damping effect using a small-sized telescopic actuator having a small stroke.

[0005]

The present invention is configured as follows to achieve the above object. According to the first aspect of the invention, the additional mass body is supported on the structure such that the additional mass body can be displaced, and a telescopic actuator for regulating the displacement is interposed between the structure and the additional mass body. Wherein an amplification mechanism for expanding the displacement of the telescopic actuator and transmitting the displacement to the additional mass is interposed between the additional mass and the telescopic actuator.

Therefore, in the above-mentioned vibration damping device, the displacement of the telescopic actuator is enlarged by the amplification mechanism and transmitted to the additional mass body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vibration damping device A according to an embodiment of the present invention will be described with reference to FIG. A support 1a is provided on the top of the structure 1, and one end of an actuator unit 2 including a telescopic actuator 2a, a spring 2b, and a damper 2c is connected to the support 1a. The other end of the actuator unit 2 is fixed to the top of the structure 1 so that the base end is attached to the structure 1 so as to rise in the height direction, and the tip is a free end that can swing freely. An additional mass 4 is provided at the free end of the support member 3 and connected to the member 3.

Since the distance from the connection point between the actuator unit 2 and the support member 3 to the fixed end of the support member 3 is smaller than the distance from the additional mass 4 to the fixed end of the support member 3, the telescopic actuator When the additional mass body 4 is to be moved by moving 2a, the support member 3 functions as an amplification mechanism.

The structure 1 is provided with an acceleration sensor (not shown) for detecting the vibration of the structure 1 itself as acceleration, and controls the operation of the actuator 2 based on an acceleration signal from the acceleration sensor. A control device (not shown) is provided.

Next, the operation of the vibration damping device A of the present embodiment will be described. When the structure 1 vibrates, the acceleration sensor detects the acceleration of the structure, and this acceleration signal is transmitted to the control device. The control device outputs an output suitable for the moving speed and the moving amount of the additional mass body 4 to the telescopic actuator 2a according to the acceleration of the structure detected by the acceleration sensor. However, since the stroke amount of the telescopic actuator 2a is amplified and transmitted to the additional mass body 10 through the amplifying mechanism, an output considering the amount is output to the telescopic actuator 2a. When the telescopic actuator 2a operates, the support member 3 swings around the fixed end.

The additional mass body 4 provided at the free end of the support member 3 moves with the swing of the support member 3, and the vibration of the structure 1 is suppressed by the reaction force generated at this time.

At this time, the distance from the connection point between the actuator unit 2 and the support member 3 to the fixed end of the support member 3 is l, and the distance from the additional mass body 4 to the fixed end of the support member 3 is L (l <L ), The amount of movement of the free end provided with the additional mass body 4 is L / l times the amount of movement of the support member 3 at the connection point with the actuator unit 2. On the other hand, the moving amount of the additional mass body 4 increases.

As described above, the vibration damping device A of the present embodiment
In this embodiment, since the support member 3 is provided between the actuator unit 2 and the additional mass body 4, the support member 3 acts as an amplification mechanism for amplifying and transmitting the amount of movement of the telescopic actuator 2 a to the additional mass body 4. The movement amount of the additional mass body 4 can be increased with respect to the stroke amount, and a greater vibration damping effect can be obtained.

Next, a vibration damping device A according to a first modification of the present embodiment will be described with reference to FIG. However, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. At the top of the structure 1, a support 1a is provided.
One end of the actuator unit 2 is connected to the support 1a. The other end of the actuator unit 2
It is connected to a rack 5 on one side with equally spaced teeth. A gear 6 meshing with the teeth of the rack 5 is provided.
The gear 6 is rotatably supported by a support member 7 provided on the top of the structure 1 via a bearing 8. A disk 9 that rotates synchronously with the gear 7 is provided coaxially with the gear 6, and an additional mass body 10 is provided on the circumference of the disk 9. The additional mass body 10 is movable in the circumferential direction of the disk 9 by rotating the disk 9.

Here, since the radius of the disc 9 is larger than the radius of the gear 6, when the additional mass body 10 is moved by moving the telescopic actuator 2a, the gear 6 and the disc 9 serve as an amplification mechanism. Works.

The structure 1 is provided with an acceleration sensor (not shown) for detecting the vibration of the structure 1 itself as acceleration, and controls the operation of the actuator 2 based on an acceleration signal from the acceleration sensor. A control device (not shown) is provided.

Next, the operation of the vibration damping device A according to a first modification of the present embodiment will be described. When the structure 1 vibrates, the acceleration sensor detects the acceleration of the structure, and this acceleration signal is transmitted to the control device. The control device outputs an output suitable for the moving speed and the moving amount of the additional mass body 10 to the telescopic actuator 2a in accordance with the acceleration of the structure 1 detected by the acceleration sensor. However, since the stroke amount of the telescopic actuator 2a increases and is transmitted to the additional mass body 10 via the amplifying mechanism, an output in consideration of that is output to the telescopic actuator 2a. The rack 5 is moved by the operation of the telescopic actuator 2, whereby the gear 6 is rotated.

The disk 9 provided coaxially with the gear 6 rotates in synchronization with the rotation of the gear 6, and the additional mass body 10 moves in the circumferential direction of the disk 9 with this rotation. The vibration of the structure 1 is suppressed by the reaction force.

At this time, since the radius of the disk 9 is larger than that of the gear 6, the moving amount of the additional mass body 10 is larger than the stroke amount of the telescopic actuator 2a, that is, the moving amount of the rack 5.

As described above, in the first modification, the gear acting as an amplifying mechanism for amplifying and transmitting the amount of movement of the telescopic actuator 2a to the additional mass body 10 is provided between the actuator unit 2 and the additional mass body 10. Since the disk 6 and the disk 9 are provided, the moving amount of the additional mass body 10 can be increased with respect to the stroke amount of the actuator unit 2, and a greater vibration damping effect can be obtained.

Further, in the vibration damping device A of the above-described embodiment, one end of the support member 3 for transmitting the displacement of the telescopic actuator 2a to the additional mass body 4 is fixed to the structure 1, so that the additional mass body When the support member 3 is moved in the vibration direction, the support member 3 may be elastically deformed to reduce the vibration damping effect. On the other hand, in the first modification, the linear displacement of the rack 5 is reduced. Since it is converted into rotational displacement using the gear 6 and this displacement is applied to the additional mass body 10,
When the additional mass body 10 is moved in the vibration direction, no elastic deformation occurs.

Next, a vibration damping device A according to a second modification of the present embodiment will be described with reference to FIG. However, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted. The rack 5 is provided with a gear 6 supported by a support member 7 provided on the structure 1 so as to mesh with the gear 6. A gear 11 having a larger diameter than the gear 6 is provided on the support member 7 coaxially so as to rotate synchronously with the gear 6. The gear 6 and the gear 11 constitute an amplification mechanism.

A rack 12 is provided on the circumference of the gear 11 so as to mesh with the teeth of the gear 11, and an additional mass 13 is provided at one end of the rack 12. Wheels 13a are provided at the bottom of the additional mass body 13, and the rack 1
By moving 2, the additional mass body 13 can be moved.

The structure 1 is provided with an acceleration sensor (not shown) for detecting the vibration of the structure 1 itself as acceleration, and controls the operation of the telescopic actuator 2a based on an acceleration signal from the acceleration sensor. A control device (not shown) is provided.

Next, the operation of the vibration damping device A according to a second modification of the present embodiment will be described. When the structure 1 vibrates, the acceleration sensor detects the acceleration of the structure, and this acceleration signal is transmitted to the control device. The control device outputs an output suitable for the moving speed and the moving amount of the additional mass body 13 to the telescopic actuator 2a in accordance with the acceleration of the structure 1 detected by the acceleration sensor. However, since the stroke amount of the telescopic actuator 2a is increased and transmitted to the additional mass body 13 via the amplifying mechanism, an output considering the amount is output to the telescopic actuator 2a. When the telescopic actuator 2a operates, the rack 5 moves,
This causes the gear 6 to rotate.

The gear 11 provided coaxially with the gear 6 has:
The rack 1 rotates in synchronization with the rotation of the gear 6 and the rack 1
2 moves in the vibration direction, and the additional mass body 13 fixed to the rack 12 moves in the vibration direction. The vibration of the structure 1 is suppressed by the reaction force generated when the additional mass body 13 moves.

At this time, if the radius of the gear 6 is r and the radius of the gear 11 is R (r <R), when the moving amount of the rack 5, that is, the stroke amount of the telescopic actuator 2a is L, the moving amount of the additional mass body 13 is (R / r) * L, and the moving amount of the additional mass body 13 is larger than the stroke amount of the actuator unit 2.

As described above, in the vibration damping device A according to the second modification of the present embodiment, the movement amount of the telescopic actuator 2 a is amplified between the actuator unit 2 and the additional mass body 13 by the additional mass body 13. The gear 6 and the gear 11 acting as an amplifying mechanism for transmitting the force are provided.
3 can be increased, and a greater damping effect can be obtained.

Further, in the vibration damping device A of the above-described embodiment, one end of the support member 3 for transmitting the displacement of the telescopic actuator 2a to the additional mass body 4 is fixed to the structure 1, so that the additional mass body When the support member 3 is moved in the vibration direction, elastic deformation may occur in the support member 3 to reduce the vibration damping effect. On the other hand, in the second modification, the linear displacement of the rack 5 is reduced. Since it is converted into a rotational displacement using the gear 6 and this displacement acts on the additional mass body 13,
When the additional mass body 13 is moved in the vibration direction, no elastic deformation occurs.

[0030]

Since the present invention is a vibration damping device having an amplifying mechanism provided between the telescopic actuator and the additional mass body, the movement of the telescopic actuator can be amplified and transmitted to the additional mass body. A great damping effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a vibration damping device A according to an embodiment of the present invention.

FIG. 2 is a diagram showing a first modification of the vibration damping device A.

FIG. 3 is a diagram showing a second modification of the vibration damping device A.

[Explanation of symbols]

 A Vibration control device 1 Structure 1a Supporting part 2 Actuator unit 2a Telescopic actuator 2b Spring 2c Damper 3 Support member 4 Additional mass body 5 Rack 6 Gear 7 Support member 8 Bearing 9 Disk 10 Additional mass body 11 Gear 12 Rack 13 Additional mass body 13a wheels

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Koji Fukui Inventor 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Tokiko Corporation

Claims (1)

[Claims] 1. A vibration damping device in which an additional mass body is displaceably supported by a structure, and a telescopic actuator for regulating the displacement is interposed between the structure and the additional mass body. A vibration amplification device interposed between the expansion and contraction actuator and the expansion and contraction actuator for transmitting a displacement of the expansion and contraction actuator to the additional mass body.