JPS59190538A - Vibration control device - Google Patents

Abstract

PURPOSE:To reduce the vibration of a vibrating body by providing an actuator to add a rotating mass in the direction of the tortional vibration of the vibrating body to generate a control torque in the added mass in accordance with the tortional vibration of the vibrating body for absorbing the vibrating energy of the vibrating body by the added mass. CONSTITUTION:When an external force is given to a vibrating body 1 to cause tortional vibrations, an added mass 8 provided near the center of the tortional vibration is rotated in a direction A of the tortional direction of the vibrating body 1. The rotation of the added mass 8 is detected as a relative revolution velocity between the vibrating body 1 and the added mass 8 by a tachometer and as a relative angle between the vibrating body 1 and the added mass 8 by a revolution angle meter 7. These detected values are respectively sent to a control unit 9 for addition, which is sent to an actuator 3. The actuator 3 generates a control torque T in proportion to the relative revolution velocity and the relative revolution angle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides vibration fTtlJ that controls torsional vibration occurring in a vibrating body by slowing the effect of an additional mass provided on the vibrating body.
This relates to the H device.

Generally, when an external force of 1M or the like is applied in the form of a moment to a structure such as a tower or a building, torsional vibration (9), for example, as shown in FIG. 1, occurs, which may cause destruction of the structure.

Conventionally, a vibration damping method has been considered in which a tension force A is applied to the vibrating body (1), which is a structure shown in Fig. 1, using a rope (2), etc., but the rope (2) tends to stretch, resulting in a large vibration damping method. The effect was not as expected.

This invention adds a mass that rotates in the direction of torsional vibration of a vibrating body, includes an actuator that generates a control torque on the added mass in response to the torsional vibration of the vibrating body, and absorbs vibration energy of the vibrating body with the added mass. The present invention provides a vibration control rack W that reduces vibrations of a vibrating body.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing the vibration control rack # of the present invention! +,
+11 is a vibrating body that vibrates torsionally due to a structure such as a building, and (3) is a vibrating body (an actuator fixed to one unit, consisting of a one-turn core (4) and a fixed core (5)).

An additional mass (8) is fixed to the tip of the rotating core (4).

Also connected to the rotating core (4) are a tachometer (6) for detecting the rotation speed of the actuator (3) and a rotation angle meter (7) for detecting the rotation angle.

(9) is a controller that receives and amplifies the rotation speed and rotation angle signals of the additional mass (8) and issues a command to the actuator (3).

FIG. 3 shows an example of the configuration of the controller (9).

(9a) is a rotational speed amplifier that increases the rotational speed signal i.

(9b) is a rotation angle amplifier that amplifies the rotation angle signal.

(9C) is an adder that adds the rotation speed signal and the rotation angle signal, and (9a) is a power amplifier that drives the actuator.

The vibration control device of the present invention having the above configuration is as follows:
When an external force is applied to the vibrating body (1), causing torsional vibration,
The additional mass (8) installed near the center of torsional rotation of the vibrating body (11) rotates in the torsional vibration direction A of the vibrating body (1).The rotational motion of the additional mass (8) is measured by the zero revolution speed meter (6). The relative rotational speed of the vibrating body (1) and the additional mass (8) is detected as 1~, and the relative rotational speed of the vibrating body (1) and the additional mass (8) is detected with a single rotation angle meter (sword), respectively. Controller (
9), is added and sent to the actuator (3).

The actuator (3) generates a control torque T proportional to the relative rotation speed and the relative rotation angle.

It acts as a damping torque to reduce torsional vibration of the vibrating body (1), and the control torque proportional to the relative rotation angle acts as a restoring force, that is, an equivalent spring, to return the additional mass (8) to the original rotation angle.

The equation of motion in this case is as follows.

J1θ1+1θ1=M6−MCfilJ2θ2=Mc
(21 MO-Cm(θ'1-02) +2 (θ1-02)
t3) Here, θ1 is the torsion angle of the vibrating body (1),
θ2 is the rotation angle of the additional mass (8), Jl and k are the inertia and torsional spring constant of the vibrating body (1), respectively,
J2. k2 is the inertia of the additional mass (8), the torsional spring constant provided between the vibrating body (1) and the additional mass (8), the gain constant corresponding to VC, Cm is the gain constant corresponding to the damping constant, and Me is the The external force applied to the vibrating body (11) in the form of a moment is the Mc&! control torque.

As described above, according to the present invention, the vibrating body (1) and the additional mass (8
), the actuator (3) generates a control torque proportional to the relative rotational speed (#t-&2)K, and the additional mass (8)
By rotating the torsional vibration of the vibrating body (1) in a direction that stops the torsional vibration of the vibrating body (1), it is possible to provide a vibration control device that reduces the torsional vibration of the vibrating body (1).

In the embodiments of the present invention, a restoring force proportional to the relative rotation angle is applied. However, for example, a motor or the like may be used as the actuator (3).

There is no limit to the rotation angle of the actuator (3), and therefore it can be applied to vibration control devices that do not require a restoring force proportional to the relative rotation angle. Although it was explained that it is proportional to the speed, this is a vibration control device that separately detects the torsional rotation speed of the vibrating body (1) and the rotation speed of the additional mass (8), and generates a control torque proportional to each rotation speed. It is clear that it can be applied to

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional embodiment, FIG. 2 is a diagram showing an embodiment of the present invention, and FIG. 3 is a configuration diagram of the controller shown in FIG. 2. In the figure, (1) is the vibrator, (3) is the actuator, +
41+'! Rotating core, (5) &! Fixed core, +6i
+! Tachometer, (71)'! Rotation angle meter, (8) is additional mass, (9) is controller, (9a) is rotation speed amplifier, (91)) is rotation angle amplifier, (,7c
) is an adder, and (9a) is a power amplifier. Note that the same line numbers in Figure 9 indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Claims] Fixed to a vibrating body that torsionally vibrates in response to external force. an actuator for rotationally moving the additional mass; means for detecting the relative rotational speed and relative rotational angle of the vibrating body and the additional mass; and a control torque proportional to the relative rotational speed and relative rotational angle of the vibrating body and the additional mass. A vibration control device comprising: a controller that issues a command to the actuator to cause vibration to occur.