JPH09256674A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a favorable damping device for indoor installation as being capable of easily doing maintenance work for a driving system and reducing its height. SOLUTION: A vibration control device 1 has a base 3 fixed to a structure, a movable mass 5 arranged on the base 3 in a movable manner, a driving system 7 to drive the movable mass 5, a control system 9 to control the driving system 7, a coil spring 11 provided between the base 3 and the movable mass 5 and an oil damper 13 provided between the base 3 and the movable mass 5. The driving system 7 consists of a columnar rotor 3102 arranged to be extended to the moving direction of the movable mass 5 and a stator 3101 working together with the columnar rotor 3102 in the state of non-contacting the columnar rotor 3102. The stator 3101 is fitted into a recess 501 on the upper face of the movable mass 5 and the columnar rotor 3102 has one end connected to the base 3.

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 for suppressing the vibration of a structure such as a building, and more specifically, a damping device called a mass damper for moving a movable mass to obtain a vibration damping action. Regarding the shaking device.

[0002]

2. Description of the Related Art A vibration damper called a mass damper that obtains a vibration damping effect by using the motion of a movable mass in order to suppress the vibration generated in a structure such as a building due to an external force such as an earthquake or wind pressure. The device is known. The mass damper is generally installed near the top of the building, and the main vibration direction of the building is horizontal. Therefore, the movable mass of the mass damper is supported so as to be movable in the horizontal direction. Such a trout
There are various types of dampers such as an active mass damper, a passive mass damper, and a hybrid mass damper.

The active mass damper includes a drive system for driving the movable mass in the horizontal direction and a control system for controlling the drive system.
Vibration of the building itself is suppressed by controlling the drive system by the control system and appropriately moving the movable mass with respect to the building.

Further, the passive mass damper is provided with a spring and a damping device interposed between the movable mass and the building, and the natural vibration of the vibration system constituted by the movable mass, the spring and the damping device. The period and the damping ratio are set to an appropriate period (a period close to the primary natural period of the building) and the damping ratio. Then, in the passive mass damper, the movable mass vibrates in response to the vibration of the building, and a force having a magnitude corresponding to the displacement of the movable mass at this time is generated via the spring,
A force having a magnitude corresponding to the speed of the movable mass acts on the building through the damping device, and thus vibration of the building itself is suppressed.

Further, the hybrid mass damper is a passive mass damper to which a drive system and a control system are further added. However, as another viewpoint,
It can be considered that an active mass damper is further provided with a spring and, if necessary, a damper. Therefore, the action of the hybrid mass damper is
The drive system assists the action of the passive mass damper,
It can be said that it is modified or strengthened so that more effective vibration damping action can be obtained, or it can be driven by adding the action of the passive mass damper to the active mass damper. It can also be said that the load on the power source of the system is reduced.

Therefore, the active mass damper or the hybrid mass damper is provided with a drive system for driving the movable mass interposed between the movable mass and the building. As an example of a conventional drive system of this type, a motor and a gear mechanism are arranged in an inner space of a movable mass, such as one provided in an active mass damper disclosed in Japanese Patent Publication No. 5-56414. A drive system having such a configuration is known.

[0007]

However, in such a conventional drive system for a mass damper, workability of regular or temporary maintenance work such as inspection, replacement, adjustment, etc. of a motor or gear mechanism is required. However, if the vibration damping device is installed indoors, the entire floor of the floor will be occupied by the vibration damping device. There was an inconvenience that it would end up. Further, when the rotational motion of the motor is converted into a linear motion by a mechanical mechanism such as a rack and pinion mechanism or a ball screw, there is a fear that the habitability in the control system and the building is adversely affected. The present invention has been devised in view of the above circumstances, and an object of the present invention is to easily perform maintenance work on a drive system such as a motor and to perform accurate control, and further to reduce the height. Another object of the present invention is to provide a vibration damping device which is advantageous when it is installed indoors.

[0008]

In order to achieve the above-mentioned object, the present invention is a vibration damping device for suppressing the vibration of a structure, the base being fixed to the structure, and the structure being movable onto the base. A movable mass that is movably supported, a drive system that drives the movable mass, a control system that controls the drive system, and a damping force that is disposed between the base and the movable mass and that moves with the movement of the movable mass. A damper for generating, and disposed between the base and the movable mass,
A movable mass and a spring forming a vibration system,
The drive system includes a column-shaped rotor arranged so as to extend in the moving direction of the movable mass, and a stator that cooperates with the column-shaped rotor in a non-contact state with the column-shaped rotor. The control system includes a motor, and the control system includes a vibration sensor that detects vibration and a controller that controls the linear motor based on a detection output of the vibration sensor. The linear motor includes a column-shaped rotor and a stator. One is connected to the base and the other is connected to the movable mass.

Further, according to the present invention, a recess extending in the moving direction of the movable mass is formed on the upper surface of the movable mass,
The stator or column of the linear motor is mounted in the recess. Further, the present invention is characterized in that the damper is an oil damper, and a cylinder body thereof is attached on an upper surface of the movable mass in a direction parallel to a moving direction of the movable mass.

Further, according to the present invention, a recess extending in the moving direction of the movable mass is formed on the upper surface of the movable mass,
The oil damper is disposed in the recess. Further, in the present invention, the movable mass has a rectangular shape in a plan view, and the spring extends in the moving direction of the movable mass over each side surface located in the moving direction of the movable mass and a base portion facing each side surface. It is characterized in that a large number of them are arranged in parallel with the moving direction of the movable mass with an interval in a direction orthogonal to, and having an initial deflection exceeding the moving range. Further, according to the present invention, the linear motor is arranged in the center of the movable mass in a direction orthogonal to the moving direction of the movable mass, and dampers are provided on both sides of the movable mass in a direction orthogonal to the moving direction of the movable mass. Is provided.

According to the present invention, the movable mass and the drive system are integrated on the base to form a vibration damping device, and the drive system is installed over the base and the movable mass. In addition, the linear motors and dampers can be arranged in a plane, which is advantageous for keeping the height of the vibration control device low, and also has an adverse effect on the control system and habitability in the building. The movable mass can be moved smoothly and with high accuracy without fear.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a plan view of a vibration damping device according to the present invention, FIG. 2 (A) is a view taken along the arrow AA of FIG. 1, and FIG.
FIG. Reference numeral 1 denotes a vibration damping device. The vibration damping device 1 includes a base 3 fixed to a structure, a movable mass 5 movably arranged on the base 3, and a drive system 7 for driving the movable mass 5.
A control system 9 for controlling the drive system 7, a coil spring 11 provided between the base 3 and the movable mass 5, and a base 3
And an oil damper 13 and the like provided between the movable mass 5 and the movable mass 5. The base 3 is formed in a rectangular frame shape in a plan view by a combination of elongated members, and spring locking members 15 are respectively provided on the short sides 3A of the base 3 at positions facing the movable mass 5 on both short sides 3A. 3C on both long sides of the base 3
A guide rail 17 is attached on the upper side along the long side 3C.

The movable mass 5 is formed in the shape of a flat rectangular parallelepiped, and is arranged with its long side 5C direction parallel to the short side 3A of the base 3. The movable mass 5 is arranged so that the bearings 19 attached to the lower ends on both sides in the direction of the long side 5C of the movable mass 5 engage with the guide rail 17 and can move linearly on the guide rail 17. These bearings 19 and guide rails 17 constitute a support system 20 that movably supports the movable mass 5 on the base 3. The support system 20 supports the movable mass 5 within a movable range from its neutral position. Supports to vibrate. On the upper surface of the movable mass 5, a concave portion 501 parallel to the short side 5A is formed at the central portion in the long side 5C direction, and concave portions 502 are formed at both ends. A spring retaining member 21 facing the spring retaining member 15 is arranged along the long side 5C of the movable mass 5.

The coil spring 11 is arranged between the spring retaining member 21 and the spring retaining member 15 corresponding thereto. The coil springs 11 are arranged in parallel with the long sides 3C of the base 3 at intervals in the direction of the short sides 3A, and are tension springs that do not cause residual strain with respect to the maximum deformation within the movable range that occurs during a level 2 earthquake. The spring constant is set so that the natural frequency of the movable mass and the coil spring matches the natural frequency of the structure, and has an initial deflection that exceeds the movable range of the movable mass 5. It is arranged. The oil damper 13 includes a cylinder body 1301, a piston incorporated in the cylinder body 1301, and a piston rod 1303 connected to the piston.
1 is attached to the recesses 502 at both ends of the upper surface of the movable mass 5, and the piston rod 1303 is attached to the cylinder body 1
It projects from both sides of 301, and each end is connected to the base 3 side.

The drive system 7 is composed of a cylindrical linear motor 7, and the cylindrical linear motor 7 has a movable mass 5
It is disposed in the above-mentioned central recess 501 formed in the above. The cylindrical linear motor 7 is composed of a rotor 3102 formed in an elongated cylindrical shape, that is, a column shape, and a stator 3101 for generating an electromagnetic force that drives the column rotor 3102 in the axial direction. Column type rotor 310
One end of the stator 2 is connected to the base 3, and the stator 31
01 is connected to the movable mass 5. Stator 3101
Is configured to surround the column-shaped rotor 3102, and has a cylindrical hole through which the column-shaped rotor 3102 is inserted. The stator 3101 and the column type rotor 3102 are the cylindrical hole of the stator 3101 and the column type rotor 310.
2 are arranged so as to be concentric with each other, whereby the column-shaped rotor 3102 and the stator 3101 are kept in non-contact with each other.

The control system 9 controls a vibration sensor 901 for detecting the vibration of a structure such as a building, and a control amount for appropriately controlling the speed or force of the linear motor 31 based on the detection output of the vibration sensor 901. It is composed of a controller 903 for calculation and a motor driver 905 for controlling the motor 31. These vibration sensor 901 and controller 9
As 03, those used in the conventionally known active mass damper and hybrid mass damper can be used. The motor driver 905 is attached to the motor 31. In FIG. 2 (A), numeral 33 indicates an oil buffer arranged on the short side 3A of the base 3, and the movable mass 5 tries to vibrate beyond the movable range in the event of an unexpected earthquake of level 2 or higher. At this time, the movable mass 5 is the short side 3 of the base.
It is for cushioning the impact when the vehicle collides with A.

The vibration damping device 1 having the above-described structure is set so that it can be actively operated with an arbitrary set earthquake input value, and a control command is calculated by the controller 903 based on the detection output from the vibration sensor 901. The command is input to the motor driver 905, the motor 31 is controlled, the movable mass 5 is driven, and the movable mass 5 is appropriately moved relative to the base 3, so that a vibration damping effect is achieved. It At this time, the movable mass 5 tries to vibrate at the natural vibration period of the vibration system including the movable mass 5 and the spring 11. However, the vibration is assisted, corrected, or strengthened by the drive system 7 to effectively control the vibration. A vibrating action is obtained.

According to this embodiment, the movable mass 5 and the drive system 7 are integrated on the base 3 to form the vibration damping device 1, and the drive system 7 is installed over the base 3 and the movable mass 5. Therefore, it becomes possible to easily perform maintenance work such as inspection, replacement, adjustment, etc. of the drive system 7.
The linear motor 7 and the oil damper 13 are arranged in a plane, which is advantageous in suppressing the height of the vibration damping device 1 to be low. Further, in the cylindrical linear motor 7, since the structure of the portions of the rotor 3102 and the stator 3101 on which the electromagnetic force acts can be made axially symmetrical, the direction of the driving force is almost completely in the axial direction, The driving force component in the (radial direction) can be made substantially zero. Further, since the rotor 3102 and the stator 3101 are not in contact with each other, no frictional force acts between them. For these reasons, the vibration damping device 1 according to the embodiment can perform precise driving force control, and the movable mass 5 can be smoothly and accurately moved without fear of adversely affecting the habitability in the control system or the building. Can be made. Further, since the drive system 7 is configured by using the non-contact type cylindrical linear motor 31, if the power supply to the stator 3101 is cut off, the action of the drive system 7 is completely lost. -When the damper is switched to the passive mass damper operation mode in an emergency, the presence of the drive system 7 does not impair the operation performance as the passive mass damper, which is very advantageous.

In addition, the stator 310 which constitutes the drive system 7
1 is disposed in the concave portion 501 on the upper surface of the movable mass 5, and
Since one end of the column 3102 is connected to the base 3, the maintenance work can be performed easily, and it is even more advantageous in keeping the height of the vibration damping device 1 low, and the vibration damping device 1 can be installed indoors. This is extremely advantageous when it is installed. Further, in the embodiment, the oil damper 13 and the coil spring 11 are arranged side by side on the flat movable mass 5, which is even more advantageous in suppressing the height of the vibration damping device 1 to be low.

In the embodiment, the case where the stator 3101 of the linear motor 31 is attached to the movable mass 5 and the column 3102 is connected to the base 3 has been described. However, conversely, the stator 3101 is used as the base. Connected to column 3, column 31
It is also possible to attach 02 to the movable mass 5.

[0021]

As is clear from the above description, the present invention
A vibration damping device for suppressing vibration of a structure, comprising a base fixed to the structure, a movable mass movably supported on the base, a drive system for driving the movable mass, A control system that controls a drive system, a damper that is disposed between the base and the movable mass and that generates a damping force with the movement of the movable mass, and a damper that is disposed between the base and the movable mass. And a spring forming a vibration system together with the drive system,
A columnar rotor arranged so as to extend in the moving direction of the movable mass, and a linear motor comprising a stator that cooperates with the column-shaped rotor in a non-contact state with the column-shaped rotor, The control system includes a vibration sensor that detects vibration and a controller that controls the linear motor based on a detection output of the vibration sensor, and one of a column-shaped rotor and a stator of the linear motor is a base. And the other is connected to the movable mass. Therefore, it is possible to obtain a vibration damping device that can be operated with high accuracy, while suppressing the height and easily performing the maintenance work of the drive system, without fear of adversely affecting the habitability in the control system and the building.

[Brief description of drawings]

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

2A is a view taken along the line AA in FIG. 1, and FIG. 2B is a view in FIG.
FIG.

[Explanation of symbols]

 1 Vibration Control Device 3 Base 5 Movable Mass 7 Drive System 9 Control System 11 Coil Spring 13 Oil Damper 31 Linear Motor 3101 Stator 3102 Column 901 Vibration Sensor 903 Controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hidemi Oyama, 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Co., Ltd. (72) Inventor, Kazuya Murakoshi 4-6-15-1 Sendagaya, Shibuya-ku, Tokyo Inside the company Fujita (72) Yoshiya Nakamura, inventor Yoshiya Nakamura 4-6-15 Sendagaya, Shibuya-ku, Tokyo Shares inside the company Fujita (72) Masaru Ishii, 4-6-15 Sendagaya, Shibuya-ku, Tokyo Shares Fujita (72) Inventor Takashi Fujita 575-28, Nakano Hisagi, Nagareyama City, Chiba Prefecture (72) Inventor Hiroshi Miyano 1-9-31 Shinonome, Koto-ku, Tokyo Mitsubishi Steel Manufacturing Company (72) Inventor Koichi Dou Tokyo, Koto 1-9-31 Shinonome Ward, Mitsubishi Steel Co., Ltd. (72) Inventor Hiroshi Kurabayashi 1-9-31 Shinonome, Koto Ward, Tokyo Mitsubishi Steel Co., Ltd.

Claims (6)

[Claims] 1. A vibration damping device for suppressing vibration of a structure, comprising: a base fixed to the structure; a movable mass movably supported on the base; and a movable mass driven by the movable mass. A drive system; a control system for controlling the drive system; a damper arranged between the base and the movable mass to generate a damping force with the movement of the movable mass; and a damper arranged between the base and the movable mass. A column-shaped rotor that is provided so as to extend in the moving direction of the movable mass, and a spring that forms a vibration system together with the movable mass. The control system is composed of a linear motor composed of a stator that cooperates with the column-shaped rotor in a contact state, and the control system controls the linear motor based on a detection output of the vibration sensor and a detection output of the vibration sensor. Is composed of One of a column-shaped rotor and a stator of a linear motor is connected to a base, and the other is connected to the movable mass. 2. A concave portion extending in the moving direction of the movable mass is formed on an upper surface of the movable mass, and a stator or a column of the linear motor is attached in the concave portion. Vibration control device. 3. The vibration damping device according to claim 1, wherein the damper is an oil damper, and a cylinder body of the damper is attached to an upper surface of the movable mass in a direction parallel to a moving direction of the movable mass. 4. The recessed portion extending in the moving direction of the movable mass is formed on the upper surface of the movable mass, and the oil damper is arranged in the recessed portion. Vibration control device. 5. The movable mass has a rectangular shape in a plan view, and the spring extends in the moving direction of the movable mass over each side surface located in the moving direction of the movable mass and a base portion facing each side surface. 5. The vibration damping device according to claim 1, 2, 3 or 4, wherein a large number of vibration damping devices are arranged in parallel with the moving direction of the movable mass at intervals in a direction orthogonal to each other with an initial deflection exceeding the moving range. 6. The linear motor is disposed in the center of the movable mass in a direction orthogonal to the moving direction of the movable mass, and dampers are provided on both sides of the movable mass in a direction orthogonal to the moving direction of the movable mass. The vibration damping device according to claim 1, 2, 3, 4, or 5, which is provided.