JP2000130497A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively control vibration in two horizontal directions of a structure. SOLUTION: A vibration control device 11 has first and second dynamic vibration reducers 13 and 14 for controlling vibration in two horizontal directions, and the reducers 13 and 14 perform vibration controlling action by a control signal from a vibration control device 15, to control the vibration in the X and Y directions of a building 12. The building 12 has a rectangle seeing from an upper part, and a shape wide and narrow in lateral width in the X direction and in depth in the Y direction respectively. A second reducer 14 is installed on the rooftop 12a of the building 12, and a first reducer 13 is loaded as additional mass on the upper part of the second reducer 14. That is, the first reducer 13 is installed in a direction for controlling the vibration in the X direction having comparatively high attenuation, and the second reducer 14 is installed in a direction for controlling the vibration in the Y direction having comparatively low attenuation.

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, and more particularly, to a vibration damping device configured to efficiently suppress vibrations of a structure in two directions.

[0002]

2. Description of the Related Art In a structure such as a building, for example, a vibration damping device for damping vibration due to an earthquake, wind pressure, or the like is provided. In this type of vibration damping device, a dynamic vibration absorber that drives an additional mass having a predetermined weight mainly corresponding to the mass of the building according to the vibration state of the building is installed on the roof of the building, and the additional mass moves in the vibration direction. It is configured to move and dampen the vibration of the building.

[0003] As a general dynamic vibration absorber, a transmission mechanism such as a ball screw which is slidably supported by a linear bearing or the like so that the additional mass is moved in the vibration direction, and which is screwed to the additional mass. Is driven by a motor or the like,
The additional mass is configured to reciprocate horizontally. In this type of vibration damping device, the motor of the dynamic vibration absorber is driven by a drive signal from a control device that calculates a control amount according to the magnitude of an output value from a sensor that detects a vibration state such as a displacement and a speed of a building. The vibration of the building is controlled by moving the additional mass under control.

Further, when the vibration direction of the structure is two horizontal directions (X and Y directions), two dynamic vibration absorbers are installed in order to suppress the vibration in two directions. For example, the two dynamic vibration absorbers are installed on the roof of a building, respectively, in a direction for controlling vibrations in X and Y directions orthogonal to each other.

[0005]

However, in the above-mentioned conventional vibration damping device, since two dynamic vibration absorbers are separately installed, the installation space is doubled, and the vibration absorber is installed on the roof of a building. Installation must be performed so as not to interfere with other equipment, and the installation place is often limited.

Conventionally, two dynamic vibration absorbers are driven by the same amount of additional mass, so that the two dynamic vibration absorbers have different vibration magnitudes depending on the vibration direction of the structure. The damping force of the vessel is set to the same level. on the other hand,
A structure such as a building has a rectangular shape when viewed from above, and often has different widths in the X direction and the Y direction.
Therefore, in this type of structure, for example, the attenuation in a wide direction is small, and the attenuation in a narrow direction is large.

[0007] As described above, since the damping force of the structure itself varies depending on the vibration direction, the moving direction of the additional mass driven by the two dynamic vibration absorbers is determined by the vibration direction (X, Y direction) of the structure.
However, if the mass of the additional mass driven in each vibration direction is the same, it is difficult to effectively suppress vibrations of different magnitudes depending on the vibration direction. Therefore,
An object of the present invention is to provide a vibration damping device that solves the above problems.

[0008]

In order to solve the above problems, the present invention has the following features. The present invention described above provides a first dynamic vibration absorber that suppresses vibration in a first direction by moving an additional mass in a first direction of a structure, and the first dynamic vibration absorber is movable as an additional mass. And a second dynamic vibration absorber configured to move the first dynamic vibration absorber so as to suppress vibration of the structure in a second direction, and the second dynamic vibration absorber moves the second dynamic vibration absorber. A second direction in which the first dynamic vibration absorber moves is matched with a direction of vibration of the structure having a small damping.

Therefore, according to the present invention, the first dynamic vibration absorber is movably mounted on the second dynamic vibration absorber as an additional mass, and is driven by the second dynamic vibration absorber. The moving direction of the structure is matched with the direction of the vibration with a small damping of the structure, so that the vibration in the second vibration direction having a large amplitude among the vibration components of the structure can be damped by the second dynamic vibration absorber, Vibration in the first vibration direction having a small amplitude among the vibration components of the structure can be damped by the first dynamic vibration absorber, and vibrations in two different horizontal directions can be effectively damped.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of the vibration damping device according to the present invention. FIG. 2 is a left side view showing a state where the vibration damping device is installed on the roof of a building. FIG. 3 is a plan view showing a state where the vibration damping device is installed on the roof of a building.

As shown in FIGS. 1 to 3, a vibration damping device 11 is generally used for horizontal two-way vibration control (for X and Y direction vibration control) installed on a roof 12a of a building 12 as a structure. The first and second dynamic vibration absorbers 13 and 14, and a control device 15 for controlling the driving of the first and second dynamic vibration absorbers 13 and 14. The first and second dynamic vibration absorbers 13 and 14 are installed in directions in which vibrations in different directions (X and Y directions) are damped. Twelve horizontal vibrations (X, Y directions) are damped.

As described above, the two dynamic vibration absorbers 13 and 14 are
Since it is configured to overlap in the state of crossing in the X and Y directions, the installation space is smaller than in the case where two units are separately installed, and even in a narrow place or a place where other equipment is installed. Can be easily installed. In addition, the first dynamic vibration absorber 13 is provided as an additional mass to the second dynamic vibration absorber 14, and there is no need to separately mount the additional mass to the second dynamic vibration absorber 14. Furthermore, since the additional mass driven by the first dynamic vibration absorber 13 and the mass of the first dynamic vibration absorber 13 driven by the second dynamic vibration absorber 14 have different weights, the two dynamic vibration absorbers 13 and The vibration damping force by 14 differs in each direction.

In the present embodiment, the building 12 is rectangular when viewed from above, has a large width in the X direction,
The shape has a narrow depth in the Y direction. Therefore, the building 12 has a large attenuation with respect to the vibration in the X direction and a small attenuation with respect to the vibration in the Y direction. That is, the building 12
When vibration due to an earthquake or the like is propagated, the amplitude in the Y direction becomes X
The structure is such that it becomes larger than the amplitude in the direction.
In a structure such as a building, a structure in which the magnitude of vibration differs depending on the two different horizontal directions (X and Y directions) is generally common.

In order to control the building 12 having different vibration characteristics in the two horizontal directions, the roof 12a is provided with a second dynamic vibration absorber 14 for controlling the vibration in the Y direction. A first dynamic vibration absorber 13 for suppressing vibration in the X direction is mounted as an additional mass above the second dynamic vibration absorber 14. That is, the first dynamic vibration absorber 13 is installed in a direction for damping the X-direction vibration of the building 12 with relatively large attenuation, and the second dynamic vibration absorber 14 is mounted with Y with relatively small attenuation.
It is installed in the direction to control the vibration in the direction.

FIG. 4 is a plan view of the dynamic vibration absorbers 13 and 14 in the X and Y directions. FIG. 5 shows a dynamic vibration absorber 1 in the X and Y directions.
It is a front view of 3,14. FIG. 6 is a left side view of the dynamic vibration absorbers 13 and 14 in the X and Y directions. As shown in FIGS. 4 to 6, the first dynamic vibration absorber 13 has a configuration in which an additional mass 17 slides in the X direction on a base 16 supported on a second dynamic vibration absorber 14. The additional mass 17 is set to a weight corresponding to the amplitude of the building 12 in the X direction. Further, both sides of the additional mass 17 are linear bearings 18 on the base 16.
Slidably supported by When the mass of the building 12 alone is insufficient due to the size of the building 12, an additional mass may be mounted on the additional mass 17.

The base 16 is provided with an AC servomotor (hereinafter, referred to as a “motor”) 19 as an actuator, and an output shaft 19 a of the motor 19 is connected to bearings 22, 23 via a coupling 21. Is connected to the ball screw 24. Ball screw 24 has additional mass 17
And screwed through. Therefore, the additional mass 17 moves on the base 16 in the X direction by the rotation of the ball screw 24.

In the second dynamic vibration absorber 14, the base 25 is fixed to the roof 12a of the building 12, and the moving base 26 is Y.
It is movably supported in the direction. The first dynamic vibration absorber 13 is mounted on the moving base 26 as an additional mass. Further, the second dynamic vibration absorber 14 is configured such that the moving base 26 is Y
The first dynamic vibration absorber 13 as an additional mass is set to have a weight corresponding to the amplitude of the building 12 in the Y direction. Both sides of the movable base 26 are slidably supported by linear bearings 27 on the base 25.

An AC servomotor (hereinafter, referred to as “motor”) 29 as an actuator is provided on the base 25, and an output shaft 29 a of the motor 29 is connected to bearings 32, 33 via a coupling 31. Is connected to the ball screw 34. Ball screw 34 is movable base 2
6 and threaded therethrough. Therefore, the moving base 26 moves on the base 25 in the X direction by the rotation of the ball screw 34.

When the building 12 vibrates due to, for example, wind pressure or the occurrence of an earthquake, the control device 15 operates in the vibration directions (X and Y directions).
The control amount corresponding to the response of the building 12 is calculated and the dynamic vibration absorber 1 is calculated.
The drive signal is output to the motors 19 and 29 of 3,14. Then, the motors 19 and 29 rotate the ball screw 24 by the supply of the driving signal from the control device 15 to
7 in the X direction, or by rotating the ball screw 34, the first dynamic vibration absorber 13 mounted on the moving base 26.
Is moved in the Y direction. At this time, the vibration of the building 12 in the X and Y directions is damped by the reaction of the additional mass 17 moving in the X and Y directions and the inertial force of the first dynamic vibration absorber 13.

Particularly, in the building 12 having a rectangular planar shape as described above, the buildings 12 are orthogonal to each other (corresponding to one intersection).
The attenuation in the X and Y directions is often different,
When the dynamic vibration absorbers 13 and 14 are installed in the building 12, the installation directions of the first dynamic vibration absorber 13 and the second dynamic vibration absorber 14 are matched according to the response of the building 12 in each vibration direction. The damping effect can be enhanced. Depending on the structure of the building 12, there are cases where two directions having different attenuations intersect at right angles, and cases where two directions intersect each other except at right angles.
And the installation direction of the second dynamic vibration absorber 14 has a large difference in attenuation.
By adjusting to the direction, a damping effect can be obtained.

As shown in FIGS. 1 to 3, on the odd-numbered floors and the roof of the wall in the Y direction of the building 12, the vibration state in the X direction due to the earthquake or wind pressure is detected by displacement, speed or acceleration. X direction vibration state detection sensor (hereinafter simply referred to as "sensor") 35 (35 ₁ to 35 ₅₎ are installed. In the building 12, on the odd-numbered floors and on the roof of the wall in the X direction, a Y direction vibration state detection sensor (hereinafter simply referred to as "sensor") 36 (hereinafter simply referred to as "sensor") for detecting the vibration state in the Y direction by displacement, speed, or acceleration. 36 _{1 to} 36 ₅ )
Is installed.

The sensors 35 and 36 are connected to the building 1
When 2 moves in one direction, a positive detection signal is output, and the building 1
When 2 moves in the other direction, a negative detection signal is output. Therefore, the control device 15 controls each sensor 3
The displacement, velocity, or acceleration of each of the vibration directions (X, Y directions) of the building 12 is detected based on the signals output from the signals 5, 36.

In the above embodiment, the X direction and the Y direction
The sensors 35 and 36 are installed on odd-numbered floors and rooftops in the directions. The sensors 3 and 3 are located on the first floor and middle floor and rooftop 12a of the building 12, or on the first floor and rooftop 12a of building 12.
It is also possible to arrange 5,36. In addition, the location where the sensors 35 and 36 are installed is not limited to the wall surface of the building 12, but may be below the floor.

FIG. 7 is a block diagram showing the configuration of the control device 15. As shown in FIG. 7, the vibration state detection signals in the X and Y directions of the building 12 measured by the sensors 35 and 36 are amplified by amplifiers 41 and 42, respectively, and converted into digital signals by an A / D converter 45. The data is output to the control circuit 40. Further, the additional mass 17 of each of the dynamic vibration absorbers 13 and 14 measured by the displacement sensors 37 and 38,
The detection signals corresponding to the amount of movement of the amplifiers 6 and 6 are output from amplifiers 43 and 44, respectively.
Are converted into digital signals by the A / D converter 45 and output to the control circuit 40.

The control circuit 40 includes an A / D converter 45
A control amount for each vibration direction (X, Y directions) is calculated based on digital signals from the sensors 35 to 38 input from the sensors. The operation result of the control circuit 40 is converted into an analog signal by the D / A converter 46 and the motor 19, 29
Are supplied to the first and second drive circuits 47 and 48.
Further, the drive circuits 47 and 48 output a speed command voltage as a drive signal corresponding to the control amount calculated by the control circuit 40 to the motors 19 and 29 of the dynamic vibration absorbers 13 and 14.

In this way, the vibrations of the building 12 in the X and Y directions are controlled by driving the motors 19 and 29 of the dynamic vibration absorbers 13 and 14 so that the additional mass 17 and the first dynamic vibration absorber 13 are moved in the X and Y directions.
It is driven in the direction and damped. In the control circuit 40, the control amount is calculated based on the detection signals from the sensors 35 and 36 by using LQ control. Note that the LQ control is a well-known technique that has been used in the related art, and a description thereof will be omitted. The control circuit 40 is not limited to the LQ control method, and other control methods such as skyhook control may be used.

In the above-described embodiment, the vibration damping device for damping the building 12 has been described as an example. However, the present invention is not limited to this, and the vibration damping device 11 is not limited to this. Objects, stadiums, etc.). Further, in the above embodiment, the first dynamic vibration absorber 13 and the second dynamic vibration absorber 14 are described as being installed so as to control two horizontal directions orthogonal to each other, but the present invention is not limited to this. For example, the second dynamic vibration absorber 14 may be installed at a predetermined angle such that the vibration damping direction of the second dynamic vibration absorber 14 is at an angle other than 90 ° with respect to the vibration damping direction of the first dynamic vibration absorber 13. Of course.

[0028]

As described above, according to the present invention, the first dynamic vibration absorber is movably mounted on the second dynamic vibration absorber as an additional mass, and the first dynamic vibration absorber is driven by the second dynamic vibration absorber. Since the moving direction of the dynamic vibration absorber of the above was matched with the direction of the vibration of the structure having a small damping, the second component having the large amplitude among the vibration components of the structure was used.
The vibration in the vibration direction can be damped by the second dynamic vibration absorber, and the vibration in the first vibration direction having a small amplitude among the vibration components of the structure can be damped by the first dynamic vibration absorber. Thus, vibrations in two different horizontal directions can be effectively damped. In particular, in a structure such as a building, the attenuation in the X direction and the Y direction that intersect each other often differs, so that when installed on each structure, the first damping is performed according to the amplitude in each vibration direction and the magnitude of acceleration. The vibration damping effect can be enhanced by matching the installation direction of the dynamic vibration absorber with the second dynamic vibration absorber.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of one embodiment of a vibration damping device according to the present invention.

FIG. 2 is a left side view showing a state where the vibration damping device is installed on the roof of a building.

FIG. 3 is a plan view showing a state where the vibration damping device is installed on the roof of a building.

FIG. 4 is a plan view of the dynamic vibration absorbers 13 and 14 in the X and Y directions.

FIG. 5 is a front view of the dynamic vibration absorbers 13 and 14 in the X and Y directions.

FIG. 6 is a left side view of the dynamic vibration absorbers 13 and 14 in the X and Y directions.

FIG. 7 is a block diagram showing a configuration of a control device 15.

[Explanation of symbols]

11 Vibration Suppressor 12 Building 13 First Dynamic Absorber 14 Second Dynamic Absorber 15 Controller 16 Base 17 Additional Mass 19, 29 Motor 24, 34 Ball Screw 26 Moving Base 35 (35 _{1 to} 35 ₅ ) X direction vibration state detection sensor 36 (36 ₁ ~36 ₅₎ Y direction vibration state detection sensor 37, 38 displacement sensor 40 the control circuit 45 a / D converter 46 D / a converter 47 first drive circuit 48 the second drive circuit

Claims (1)

[Claims] 1. A first dynamic vibration absorber for moving an additional mass in a first direction of a structure to dampen vibration in a first direction, and wherein the first dynamic vibration absorber is movable as an additional mass. And a second dynamic vibration absorber that moves the first dynamic vibration absorber so as to suppress vibration of the structure in a second direction, and the second dynamic vibration absorber moves the second dynamic vibration absorber. A vibration damping device wherein a second direction in which the first dynamic vibration absorber moves is matched with a vibration direction in which the structure has a small damping.