JPS6085165A - Vibration control apparatus of structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a vibration control device f for reducing vibrations of structures such as buildings, antennas, nuclear power control panels, etc.
The present invention aims to provide a servo damper that utilizes external energy controlled by hydraulic pressure, pneumatic pressure, or electromagnetic force.

[Prior art]

A conventional device of this type is shown in FIG. In the figure, (1) is a structure that generates vibration when subjected to an external force, such as a building, an antenna, a nuclear power control panel, etc.

(2) is an additional weight drive device, (3) is a vibration detector that detects the vibration of structure (1), and in this example, an accelerometer, (4
) is a control circuit that controls the additional weight drive device (2) based on the detection signal from the vibration detector (3).

(5) is a driving power source for the additional weight driving device (2).

FIG. 2 is a sectional view showing an example of the additional weight driving device shown in FIG. 1. In the figure, (211 is an additional weight, which generally has a mass of about 1 inch of the structure (1), or an actuator, (to) a bearing support, (
Goods) is a linear bearing, +251 is a connecting rod, ■ is a drive part of the actuator @, @ is a coupling that connects the connecting rod and drive part, @ is a mounting base for mounting the actuator @, @
This is a frame for fixing the bearing support base (to) and the mounting base (1), and is installed on the floor or ceiling of the structure (1).

Next, the operation will be explained based on FIGS. 1 and 2. When the structure (1) vibrates in the horizontal direction due to an external force such as an earthquake or wind, the vibration of the structure (1) is detected as an electrical signal by a vibration detector (3) trap.

The control circuit (4) that receives this electric signal converts it into a required photographic displacement amount or vibration speed, and controls the driving of the additional weight driving device (2).

That is, the actuator or the drive unit (a) and the coupling node are operated in response to a control signal from the control circuit (4).

The additional weight (21) is driven linearly and vibrably as shown by the arrow through the connecting rod (c). At this time, based on the law of one action and one reaction, the driving force generated by the actuator @ is applied to the structure (1) via the mount and the frame. The control circuit (4) is based on the principle explained below so that this driving force counteracts the vibration of the structure (1).
), the vibration of the structure (1) is extremely damped and functions as a vibration control device.

4. The vibration reduction principle of this device is that when the force (external force) and the control force act on the structure (1), the vibration reduction principle is as follows:
1) mode mass, C is the damping coefficient, k is the spring constant of structure (1), F is external force, U is control force, X is structure - (1)
It is assumed that the equation of motion is established as the displacement of m'x+cx + ni = FU.

Here, for example, by detecting the vibration acceleration of the structure (1), converting it into a velocity signal and a displacement X signal, and applying these values to the above equation of motion, the external force F can be attenuated. The optimal control force U (i.e. the structure (1
) is obtained (details are described in Japanese Patent Application No. 57-41094 entitled "Vibration Control Device").

Since the conventional vibration control device is configured as described above, the vibration detector (3) attached to the structure (1).

Depending on the mounting location, local shock disturbances may cause local elastic vibrations to be excited in the mounting member.
Depending on the situation, this local elastic vibration will be detected, and the additional weight drive device (2) will be driven by this signal. Such local elastic vibrations of the mounting member or the floor are essentially different from the natural vibrations of the structural vibration system, and are not the vibrations to be suppressed by the vibration control device. Therefore, if the local elastic vibration of the mounting member at the mounting location of the vibration detector (3) becomes large and prevails, a damping force other than the vibration to be damped is applied to the structure 111K. As a result, not only the allocation performance deteriorates but also the reliability of the device becomes a problem.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it connects a bandpass filter that passes a signal based on the natural frequency of the vibration system of the structure between the vibration detector and the additional weight drive device. and remove the noise.
Okay, remove the influence of local elastic vibrations at the mounting location of the above-mentioned imaging detector.

It is an object of the present invention to provide a vibration control device having high reliability.

(Embodiment of the Invention) An embodiment of the invention will be described below with reference to the drawings. Third
FIG. 4 is a block diagram showing a vibration detection device according to an embodiment of the present invention, and FIG. 4 is a block diagram showing a control system according to an embodiment of the present invention. In the figure, (6) is a bandpass filter that is provided between the vibration detector (3) and the control circuit (4) and passes a signal based on the natural frequency of the structure vibration system. It is preferable that the filter range of the bandpass filter (6) is set to about 10 inches before and after the natural frequency of the structure vibration system.1For example, when the natural frequency of the structure vibration system is 2Hz, the filter range is 1. The frequency may be 8 to 2.2 Hz.

In the vibration control device configured in this way.

The mounting member of the structure (1) to which the vibration detector (3) is mounted.

A sudden disturbance causes local elastic vibration.

Even if this elastic vibration component is more dominant than the vibration component of the entire structure, the bandpass filter (6) K can extract only the magnitude of the natural vibration component of the structure vibration system that is the object of vibration control. A signal corresponding to the natural vibration component is transmitted to the control circuit (4) to drive the additional weight drive device (2). Therefore, a damping force is applied to the structure (11K fi) according to its natural vibration.

The vibrations of the structure (1) are effectively reduced.

In addition, in the above embodiment, the case where the bandpass filter (6) was provided between the vibration detector (3) and the control circuit (4) was explained, but the control circuit (4) and the additional weight driving device (2) In this case, the filter range is 9, for example, 1 before and after the natural imaging number of the structural vibration system.
It is preferable to set it so that only the control signal based on 0chi can pass.

In addition, although the above embodiment describes the case where the present invention is applied to a vibration control device using an electrodynamic actuator, the present invention may also be applied to a vibration control device using a hydraulic actuator or a pneumatic actuator. In many cases, the same effects as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, a bandpass filter that passes a signal based on the natural imaging frequency of the structure vibration system is connected between the vibration detector and the additional weight drive device.

Since noise is removed, the influence of local elastic vibrations at the location where the vibration detector is installed can be removed.

A vibration control device with high reliability can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a conventional vibration control device, FIG. 2 is a sectional view showing the configuration of the additional weight drive device shown in FIG. 1, and FIG. 3 is a vibration control device according to an embodiment of the present invention. Diagram,
FIG. 4 is a configuration diagram showing a control system according to an embodiment of the present invention. In the figure, (1) is the structure, (2) is the additional weight drive device, (3) is the vibration detector, (4) is the control circuit, (6) is the bandpass filter, t21+ is the additional weight, and @ is It is an actuator. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (1)

[Claims] Installed in a structure that receives external force and generates vibration. An additional weight drive device having an actuator and an additional weight attached to a drive section of the actuator. A vibration detector for detecting vibrations of a structure, and a control circuit for driving the actuator based on a detection signal from the vibration detector to linearly move the additional weight, the vibration system of the structure A vibration control device for a structure, characterized in that a bandpass filter that passes a signal based on a natural frequency is connected between the vibration detector and the additional weight drive device to remove noise.