JPH0639850B2 - Vibration control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vibration control device for controlling vibration generated in a vibrating body such as a building, an elevated road, or a tower by the movement of a movable mass body provided in the vibrating body.

Generally, a mass damper was used to prevent the signal generated in the vibrating body (1). As shown in FIG. 1, this mass damper includes a vibrator (1) having a mass Ms, a spring (2) having a spring constant Kd, and a mass Md via an actuator (3).
The movable mass body (4) is attached to be movable. This movable mass body (4) detects vibration by an accelerometer (5) attached to the vibrating body (1), and applies a reverse control force proportional to the vibration speed of the vibrating body (1) to a controller (6). Is given from the actuator (3) to attenuate the vibration of the vibrating body.
The equation of motion at this time is as follows.

Where Xs is the displacement of the vibrating body (1), Cs is the damping constant of the vibrating body (1), Ks is the spring constant of the vibrating body (1), Xd is the displacement of the movable mass body (4), Fex is an external force, Fc is the controlling force.

As this control force, the conventional mass damper uses the vibrating body (1)
Vibration speed Proportional to However, C _m : The control gain coefficient was generated by the actuator (3), and the movable mass body (4) was moved in the direction to stop the vibration of the vibrating body (1) to damp the vibration.

By the way, focusing attention on the primary, secondary, and tertiary vibration eigenmodes of the vibrating body (1), the modes shown in FIG. 2 are known. When the accelerometer (5) is attached to this vibrating body (1) as shown in Fig. 2 and the control position is set at point A at the top of the vibrating body (1), the control force is expressed by the formula (3). The control force Fc of is represented by the following eigenmodes.

Where ▲ Φ ^m _i ▼: i-th eigenmode vector of vibration detection point ▲ Φ ⁿ _i ▼: _i- ^th eigenmode vector of control force action Km: control gain coefficient where eigenmodes ▲ Φ ^m _i ▼, ▲ Φ ⁿ _i The sign of ▼ gives positive and negative control force. Regarding the primary mode of Fig. 2 (a),
Since the sign of ▲ Φ ^m ₁ ▼ at the vibration detection point and the sign of ▲ Φ ⁿ ₁ ▼ at the control force acting point A are the same, the control force acts as a damping force, but the secondary mode of (b) In the third mode of (c), since the signs of ▲ Φ ^m ₂ ▼ and ▲ Φ ⁿ ₂ ▼, and ▲ Φ ^m ₃ ▼ and ▲ Φ ⁿ ₃ ▼ are different, the control force acts as an exciting force. . Thus, depending on the mode, if the signs of the eigenmode of the vibration detection point of the vibrating body (1) and the eigenmode of the control force acting point are different, the control force does not work or, conversely, acts as an exciting force. It had a drawback that it would end up.

The present invention is intended to improve the drawbacks of the conventional one, and the vibration detection point of the vibrating body (1) and the control substantially acting point are set at the same position, so that the vibration of each mode of the vibrating body (1) is suppressed. Is effectively reduced.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a diagram showing a vibration control device of the present invention, in which (3) is an actuator, (4) is a movable mass body, and (5) is an accelerometer for detecting the vibration acceleration of the vibrating body (1). At the same position as the actuator (3) that operates the movable mass body (4),
It is mounted in the same direction as the operating direction of this actuator (3). (6) is a controller for driving the actuator (3). This controller (6) includes an integrator (6 _a ), a speed signal amplifier (6 _b ), a controller (6 _c ), and a power amplifier ( 6 _d ) and.

The vibration control device of the present invention configured as described above is
When the external force Fex acts on the vibrating body (1) to cause vibration, the vibrating body
The accelerometer (5) attached to (1) detects vibration acceleration and inputs the detection signal to the controller (6). Controller (6)
The acceleration signal input to is input to the controller (6 _c ) via the integrator (6 _a ) and speed signal amplifier (6 _b ). The controller (6 _c ) controls the gain so that a control force proportional to the vibration speed of the vibrating body (1) is generated, and the power amplifier (6
_{In d} ), the actuator (3) outputs a signal to generate a control force. Actuator receiving this signal
(3) gives a reciprocating motion to the movable mass body (4) with a control force proportional to the vibration speed. The vibration of the vibrating body (1) is damped by the inertial force due to the reciprocating movement of the movable mass body (4).

In the above, since the vibration detection point and the control force acting point are at the same position, the sign of the eigenmode vector of the vibration detecting point and the sign of the eigenmode vector of the control force acting point are the same, and the control force is It will act as a damping force on the body (1).

As described above, according to the present invention, the vibration detection point of the vibrating body (1) is provided at the same position as the point where the control force is applied and in the same direction as the direction in which the control force is applied. )
It is possible to provide a vibration control device capable of attenuating vibrations of a plurality of eigenmodes of a vibrating body without being influenced by the vibration modes of 1.

[Brief description of drawings]

FIG. 1 is a diagram showing a conventional vibration control device, FIG. 2 is a diagram showing a vibration mode of a vibrating body, and FIG. 3 is a diagram showing an embodiment of the vibration control device of the present invention. ) Is a vibrating body, (3) is an actuator, (4) is a movable mass body, (5) is an accelerometer,
(6) is a controller, (6 _a ) is an integrator, (6 _b ) is a speed amplifier, (6 _c )
Is a controller and (6 _d ) is a power amplifier. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Tashiro Inventor Hideo Tashiro 325 Kamimachiya, Kamakura City, Kanagawa Mitsubishi Electric Corporation Kamakura Factory (56) References JP 51-29419 (JP, B1) ASCE, 1979, 4 Month

Claims (1)

[Claims] 1. A movable mass body mounted via a spring to a vibrating body that vibrates in a plurality of eigenmodes when receiving an external force,
Detecting means for detecting the vibration of the vibrating body, an actuator fixed to the vibrating body for reciprocating the movable mass body, and a control force corresponding to the vibration detected by the detecting means can be generated in the actuator. In a vibration control device comprising a controller, the vibration detection points are controlled so that the eigenmode vectors of the vibration detection points of the detection means and the positive and negative signs of the eigenmode vectors of the control force acting points have the same sign. A vibration control device, wherein the vibration control device is provided at the same position as the point of action, and the vibration detection direction is provided in the same direction as the control force action direction.