JPH0586747A - Vibration suppressing device equipped with automatic control mechanism - Google Patents

Abstract

PURPOSE:To improve reliability by installing a vibration detector for detecting the vibration component, direction judging device for judging the direction of increase/ decrease of the component, level detector for detecting the magnitude of the component, signal generator and a driving device. CONSTITUTION:When vibration generates on a construction because of an earthquake, a vibration detector 110 detects the vibration component as electric signal, and the increase/decrease direction of the detected vibration component is judged as electric signal by a direction judging device 120, and the magnitude is detected by a level detector 130. When the magnitude of the vibration component exceeds a previously set level, the judging device 120 and the detector 130 send each signal into a pulse signal generator 140, which transmits a certain certain driving signal in pulse form into the electromagnets 100A and 100B, and a certain electromagnetic force is applied to an additional weight 3. Then, the structure is applied with a reaction force based on the inertial force of the weight 3 due to the electromagnetic force, and the vibration of the structure is reduced. Accordingly, the driving force or one magnet 100 is reduced by applying a certain driving force little by little onto the weight 3, and reliability can be improved.

Description

Detailed Description of the Invention

A. OBJECT OF THE INVENTION (1) Industrial field of application The present invention is directed to an automatic vibration suppressing device (both a vibration damping device or an active mass damper, which reduces vibration caused in a structure by an external force such as wind or earthquake through an automatic control mechanism). Say)
In more detail, regarding the additional weight, the additional weight is movably attached to the structure, and the inertial force of the additional weight gives a reaction force in a direction of canceling the vibration acting on the structure to reduce the vibration. The present invention relates to an automatic vibration suppressor.

(2) Prior Art In such an automatic vibration suppressing device, as an operating part, an additional weight is movably provided on the roof of a structure or in an appropriate floor by a supporting means such as a ball bearing or a laminated rubber body. The vibration is reduced by attaching the additional weight and by vibrating the additional weight in a direction in which the vibration acting on the structure is canceled by a vibrating device such as a hydraulic cylinder. Then, as the control unit, the vibration input to the structure is detected by the vibration detector, and the detected vibration is analyzed by the arithmetic processing unit, so-called computer, for the magnitude of the vibration, the frequency characteristic, the response acceleration, etc. The optimum vibration force and vibration direction to the additional weight that minimizes the response of the load are calculated, the vibrator is driven based on the command from the processing device, and the additional weight is excited to input vibration. To cancel.

However, according to the automatic vibration suppressing device of the prior art, since the vibration exciter is designed for the maximum value of the expected input vibration, for example, a hydraulic cylinder requires a high output, and therefore the cylinder itself. Has a large capacity, and
Since high responsiveness is required, a hydraulic power source for supplying hydraulic pressure to the hydraulic cylinder is also required to have a large capacity and high output. In addition, because a high-precision control device is required, deterioration of electronic components that make up the arithmetic processing device due to aging, noise to the control device due to disturbance, trouble with the shaker, and other unexpected external factors Depending on the factor, there is a problem in the reliability of the entire system that the additional weight may resonate with the structure and promote vibration on the contrary.

(3) Problem to be Solved by the Invention In view of the above situation, the present invention is excellent in a simple structure and a small drive source without adopting a complicated structure as in the conventional automatic vibration suppressing device. The purpose of the present invention is to obtain a highly reliable automatic vibration suppressing device that exhibits vibration damping performance.

B. Configuration of the Invention (1) Means for Solving Problems The vibration suppressing device of the present invention adopts the following technical means in order to achieve the above object. That is, in the vibration suppressing device configured to reduce the vibration acting on the structure by applying the reaction force in the direction of canceling the vibration acting on the structure using the inertial force of the additional weight, the vibration suppressing device acts on the structure. A vibration detector that detects at least one vibration component of vibration acceleration, velocity, and displacement; a direction discriminator that determines the increase / decrease direction of the vibration component detected by the vibration detector; and a direction detector that is detected by the vibration detector. A level detector for detecting the magnitude of the vibration component; and a signal generator for generating a constant level drive signal in a pulse form when the magnitude of the vibration component detected by the level detector exceeds a predetermined level. And; the direction of the vibration component started by the pulse drive signal generated from the signal generator, and the vibration component determined by the direction determiner with respect to the additional weight by the activation. The driving device for providing a reaction force in the opposite direction; characterized by comprising the.

In the above structure, the additional weight is supported by a spring, a roller, a suspension member, or the like so as to have a period sufficiently longer than the primary natural period of the structure, and the primary natural period of the structure is 2 When the time is about second, the cycle is usually set to about 4 to 6 seconds. In addition, the drive device uses the driving force generated by the current generated by the current generator to apply an inertial force to the additional weight, and an electromagnet, a linear motor hydraulic cylinder, a pneumatic cylinder, a cam device, etc. are used. To be done.

(2) Action When a large vibration acts on a structure due to an earthquake, the vibration detector detects this vibration and detects the vibration component as an electric signal. The direction discriminator determines the increasing / decreasing direction of the vibration component of the detected vibration component, and the level detector detects the magnitude of the vibration component. When the magnitude of the vibration component detected by the level detector exceeds a preset level, a signal is sent from the level detector to the pulse current generator and the direction discriminator detects the vibration component to the pulse current generator. The increasing / decreasing direction is sent as a signal.
With both of these signals, the pulse signal generator sends a pulsed constant driving signal to the driving device directly or via the output amplifier, and the driving device causes the driving device to apply a constant pulsed driving force to the additional weight. give. The driving force gives a reaction force to the structure based on the inertial force of the additional weight, and the vibration of the structure is reduced.

(3) Embodiment An embodiment of the automatic vibration suppressing device of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show an automatic vibration suppressor of one embodiment thereof.

(Structure of Embodiment) This automatic vibration suppressing device S
Is composed of a vibration damping device unit 1 and a detection processing unit 2. The vibration damping unit 1 mainly includes an additional weight 3 and includes an operating mechanism for driving the additional weight 3, and the detection processing unit 2 receives an input vibration. Is detected and its signal processing is performed, and a drive signal is sent to the operating mechanism of the vibration damping device section 1.

The configuration of each section will be described in detail below.Vibration control device section 1  In the vibration damping device unit 1, a casing 1 having a rectangular box shape
Reference numeral 0 denotes a flat plate-shaped bottom plate 11, a rectangular frame-shaped outer frame body 12 and an upper lid.
It has a certain rigidity from 13 and the
Fixed to the floor of the structure with the bottom plate 11
It Then, in the outer frame 12 of the casing 10,
Longitudinal leaf springs fixed to two opposite sides of the frame body 12
Material 15 and horizontal leaf spring member 16 fixed to the other two sides
An inner frame body 17 similar to the outer frame body 12 is arranged via the. The
The inner frame 17 also maintains rigidity. The vertical leaf spring 15 is the middle frame 1
7 has a function of movably supporting the horizontal leaf spring 16
Allows its movement in only one direction due to its lateral rigidity. Example
In the vertical leaf spring 15, two leaf spring elements facing each other are provided.
Although they are arranged as a set, there is no functional change even if they are arranged in the same direction.
There are also two horizontal leaf springs 16 on each side.
However, the number is not limited.

A vertical leaf spring member 19 fixed to the two opposite sides of the inner frame body 17 and a horizontal leaf spring member fixed to the other two sides of the inner frame body 17 are also provided. A rectangular parallelepiped weight portion 3 is arranged via 20. The functions of the vertically-placed leaf spring member 19 and the horizontally-placed leaf spring member 20 and their installation modes are the same as those of the leaf spring members 15 and 16 described above. As can be seen from the figure, the vertical springs 15 and 19 and the horizontal leaf springs 16 and 20 are arranged orthogonally to each other.

With this construction, however, the inner frame body 17 is allowed to move in one direction on the plane (Y direction in the drawing), and the weight portion 3 moves in the other direction with respect to the inner frame body 17 (in the drawing). Since movement in the X direction) is allowed, X-Y as a whole
Displacement is allowed in all directions of the plane. Further, since the inner frame body 17 and the weight portion 3 are supported and regulated by the leaf spring, the movement thereof can be performed with an extremely small force.

Reference numeral 22 denotes a damping portion, which is a recessed portion 23 provided in the upper surface of the weight portion 3, a disc-shaped resistance plate 25 at the lower end of a support rod 24 attached to the upper lid 13 of the casing 10, and a recessed portion. 23 and the viscous fluid L filled in. Recess 2
The bottom surface of 3 and the lower surface of the resistance plate 25 are held at a predetermined distance s, and the vibration of the weight portion 3 is damped by viscous resistance generated by the viscous fluid L interposed therebetween.

Reference numeral 100 denotes a driving device as an operating mechanism equipped in the vibration damping device section 1, which takes the form of an electromagnet.
It is arranged between the outer frame body 12 and the inner frame body 17, and the inner frame body 17 is
The primary electromagnet 100A is driven in the direction, and the secondary electromagnet 100B arranged between the inner frame 17 and the weight 3 drives the weight 3 in the X direction. Each electromagnet 100A, 1
00B are arranged as a set of two facing each other with the center of the weight portion 3 interposed therebetween. Further, each electromagnet 100 has a pair of poles 10.
0a and 100b are arranged opposite to each other and are made of homopolar bodies,
Repulsive force is generated with energization. The pair of electromagnetic actuators 100 are not energized at the same time, and energization of one energizes the other. The electromagnetic actuator 100 is electrically connected to the detection processing unit 2, particularly to a signal amplifier described later, via electric wiring.

The vibration damping device section 1 is installed at the antinode of the vibration of a structure that causes rolling on the basis of its natural period.

[0016]Detection processing unit 2  In the detection processing unit 2, 110 is a vibration detector,
(Distributed in the structure), (distributed in the ground), put in the structure
1 of vibration components such as acceleration, velocity, and displacement of the applied vibration
Alternatively, it detects two or more vibration components and uses them as electrical signals such as voltage.
And take out over time. These vibration components are 2
It is decomposed in the axial direction and detected as each axial component. Shaking
The vibration component signal detected by the motion detector 110 is
It is sent to the code discriminator 120 and the level detector 130.

The sign discriminator 120 determines whether the vibration component is positive or negative, that is, the direction on each coordinate axis (X, Y). Further, the level detector 130 takes out only the component of the vibration component that exceeds a certain level in absolute value, and cuts the component below it.

Reference numeral 140 denotes a pulse signal generator, which generates a drive signal (usually a current pulse) of a constant level in a pulse form based on the signal output from the level detector 130 while the signal is maintained. .. The pulse drive signal has a constant magnitude and outputs a predetermined number of pulses per unit time. In the signal generator 140, the code discriminator 12 is also used.
In response to the signal of 0, the current is switched to each electromagnetic actuator 100 (4 in this embodiment). The output amplifier 150 is installed if necessary, amplifies the output signal from the signal generator 140, and sends the amplified signal to the electromagnet 100.

(Operation / Effect of Embodiment) The automatic vibration suppressing device S of the present embodiment thus constructed operates as follows. Now, when an external force such as an earthquake or wind load acts on the structure and vibration occurs in the structure, the vibration detector 110 detects this vibration in two axial directions and detects the vibration component as an electric signal. .. With respect to the detected vibration components in the two axial directions, the direction of the vibration component is discriminated by the increase / decrease direction discriminator 120, and the magnitude of the vibration component is detected by the level detector 130. When the magnitude of the vibration component detected by the level detector 130 exceeds a preset level, a signal is sent from the level detector 130 to the pulse signal generator 140 and the pulse signal is sent from the direction discriminator 120. The direction of the vibration component is sent to the generator 140 as a signal. A pulse signal generator 14 is generated by the both signals.
0 sends a pulsed constant level drive signal to each electromagnet 100A, 100B via the output amplifier 150 for the signal duration in the level detector 130. By the drive signal, the electromagnets 100A and 100B give a constant pulsed electromagnetic force to the additional weight 3 in the X and Y directions, respectively. Due to the electromagnetic force, a reaction force based on the inertial force of the additional weight 3 is applied to the structure, and the vibration of the structure is reduced. Further, the damping unit 22 is provided in the vibration damping unit 1 of the automatic vibration suppressing device.
Is added, it is possible to prevent the weight unit 3 from excessively moving due to inertial force.

As described above, according to the vibration suppressing device with the automatic control mechanism of the present embodiment, only the direction and the magnitude of the input vibration are detected, and when the magnitude of the input vibration exceeds the predetermined level, the magnitude of the input vibration is detected. Regardless of this, a constant pulsed electromagnetic driving force is applied to the additional weight 3 in the direction opposite to the direction of the input vibration in small increments over the duration of the input vibration. Since it is small, a driving source is small, and a simple structure is sufficient, and reliability can be improved.

In this embodiment, the weight 3 is supported by the vertically placed leaf spring, but it may be supported by the rolling support. In this case, it goes without saying that horizontal omnidirectional support is provided by a spherical body (ball bearing).

The present invention is not limited to the above embodiment, but various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included in the technical scope of the present invention. In the above embodiment, the vibration damping device section 1 has a structure that allows two-dimensional displacement, but it may be limited to one axis direction. In this case, the inner frame body 17 is omitted, and the weight portion 3 is directly attached to the outer frame body 12 and arranged. As a result, the depth detection unit 110 of the detection processing unit 2 may of course detect one axis.

C. Advantageous Effects of Invention According to the automatic vibration suppressing device of the present invention, only the direction and the magnitude of the input vibration are detected, and when the magnitude of the input vibration exceeds a predetermined level, the input vibration can be detected regardless of the magnitude of the input vibration. Since a constant pulsed driving force is applied in small increments to the additional weight in the direction opposite to the direction, the driving force source of the electromagnetic device is small and a simple structure is sufficient to improve reliability. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view (cross-sectional view taken along the line I-I in FIG. 2) showing the overall configuration of an embodiment of an automatic vibration suppressing device of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

S ... Vibration suppressor, 3 ... Additional weight, 100 ... Electromagnet, 1
10 ... Vibration detector, 120 ... Sign discriminator, 130 ... Level detector, 140 ... Signal generator, 150 ... Signal amplifier

Claims (2)

[Claims] 1. A vibration suppressing device configured to reduce a vibration acting on a structure by applying a reaction force in a direction in which a vibration acting on the structure is canceled by utilizing an inertial force of an additional weight. A vibration detector that detects at least one vibration component of acceleration, velocity, and displacement of vibration that acts on the vibration; a direction discriminator that determines the increase / decrease direction of the vibration component detected by the vibration detector; A level detector for detecting the magnitude of the vibration component detected by; a pulse-shaped drive signal having a constant level when the magnitude of the vibration component detected by the level detector exceeds a predetermined level. A signal generator; activated by a pulse drive signal generated from the signal generator, of the vibration component discriminated by the direction discriminator with respect to the additional weight by the activation. Control mechanism of the vibration suppression apparatus, characterized by consisting of: a driving device for providing a reaction force in a direction opposite to the direction. 2. The control mechanism of the vibration suppressing device according to claim 1, wherein a signal amplifier for amplifying an output generated from the signal generator is interposed between the signal generator and the driving device.