JP2966146B2 - Vibration suppressor with automatic control mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

A. Object of the invention (1) Industrial application field This invention is equipped with an automatic control mechanism that reduces the vibration generated in a structure by an external force such as wind or earthquake through the automatic control mechanism.
More specifically, the present invention relates to a vibration suppressing device (also referred to as a vibration damping device or an active mass damper). More specifically, an additional weight is movably mounted on a structure, and the vibration acting on the structure is canceled by the inertial force of the additional weight. Vibration with automatic control mechanism that reduces the vibration by giving a reaction force
It relates to a suppression device .

(2) Conventional technology In such a vibration suppression device with an automatic control mechanism ,
As an operating part, an additional weight is movably mounted on the roof of the structure or in an appropriate level by a support means such as a ball bearing or a laminated rubber body, and the additional weight is attached to the structure by a vibrator such as a hydraulic cylinder. Vibration is reduced in a direction in which the acting vibration is canceled. Then, as a control unit, the vibration input to the structure is detected by a vibration detector, and the detected vibration is analyzed by an arithmetic processing unit, a computer, for the magnitude, frequency characteristics, response acceleration, and the like of the vibration. Calculate the optimal vibration force and the vibration direction to the additional weight so that the response of the additional weight is minimized, drive the vibrator based on the command of the processing device, and vibrate the additional weight to obtain the input vibration. Is to be canceled.

However, the conventional automatic control mechanism is provided.
According to the vibration suppression device , in order to design the vibrator for the maximum value of the expected input vibration, for example, in the case of a hydraulic cylinder, the cylinder itself has a large capacity because it requires a high output, and has a high Because it requires responsiveness, hydraulic pressure
A large-capacity, high-output hydraulic pressure source for supplying hydraulic pressure to the cylinder is required. In addition, since a high-precision control device is required, unexpected external factors such as deterioration of the electronic components constituting the arithmetic processing device due to aging, generation of noise in the control device due to disturbance, trouble of the vibrator, etc. Depending on the factor,
There is a problem in the reliability of the entire system, for example, the additional weight may resonate with the structure and conversely promote vibration.

(3) Problems to be Solved by the Invention In view of the above circumstances, the present invention has been made in consideration of the conventional vibration control with an automatic control mechanism.
The objective is to obtain a highly reliable vibration suppression device with an automatic control mechanism that does not employ a complicated structure like a motion suppression device , has a simple structure, exhibits excellent vibration suppression performance with a small drive source, and has a high reliability. I do.

B. Configuration of the Invention (1) Means for Solving the Problems The vibration suppressing device of the present invention employs the following technical means to achieve the above object. In other words, use the inertial force of the additional weight
A reaction force in the direction to cancel the vibration acting on the structure
Vibration suppression to reduce vibration acting on the structure
In the device, while holding the additional weight,
A vibration damping device including an operation mechanism for driving the weight,
From the detection processing unit that sends a signal to the operating mechanism in the unit
The vibration damping device section (a) has a substantially rectangular parallelepiped shape.
(B) a predetermined distance between the four sides of the side of the additional weight;
Surrounds in parallel with and has a substantially quadrilateral shape ,
Additional weight is provided by vertical leaf springs arranged on two opposite sides.
Supports the weight, and the other two opposite sides are between the additional weight
An inner frame body provided with a horizontal leaf spring; and (c) the inner frame body.
Enclose the four sides in parallel at a predetermined interval, and
Vertical plate, which has a quadrilateral shape and is arranged on two opposite sides
The inner frame is supported by a spring, and on the other two opposite sides
Has a horizontal leaf spring disposed between the inner frame and the inner frame.
An outer frame fixed to an elephant structure;
When the inner frame and the outer frame are made to be relatively movable in an orthogonal shape,
In addition, a side arranged on a horizontal leaf spring between the inner frame body and the outer frame body
An electromagnetic drive device activated by a pulse drive current
And the detection processing unit (a) acts on the structure.
At least one of acceleration, velocity, and displacement of vibration
A vibration detector for detecting a dynamic component; and (b) the vibration detector
Therefore, a direction judgment for determining the direction of increase or decrease of the detected vibration component is performed.
(C) a vibration component detected by the vibration detector;
A level detector for detecting the size of a minute; and (d) the level.
The magnitude of the vibration component detected by the detector is
When the signal exceeds the bell, a drive signal of a certain level
Produced to the signal generator and, made, the detecting device unit
The constant level pulse drive generated from the signal generator
The electromagnetic drive device of the vibration suppression device section is activated by the electric current.
And the additional weight is discriminated by the direction discriminator.
Giving a reaction force in the direction opposite to the direction of the vibration component
It is characterized by.

[0006] In the above structure, the additional weight is formed on the structure.
The plate must have a sufficiently long period compared to the primary natural period
Supported by springs, etc., the primary natural period of the structure
In the case of about 2 seconds, the cycle is usually set to about 4 to 6 seconds.
You. Also, the drive is generated from a current generator
Using the electromagnetic driving force generated by the electric current,
An electromagnet or the like is used to provide sexual power.

(2) Function In the vibration damping device, the vertical leaf spring uses an outer frame as a fixed body.
Support each member of the additional weight and inner frame, and
Allows horizontal movement and horizontal leaf springs
Control movement only in the direction. As a result, the additional weight is
Go whereas countercurrent to the body, the other against the inner frame body outer frame member
Move at right angles to. Additional weight is free in all horizontal directions
And the use of leaf springs
The movement is realized with a small force. When a large vibration acts on a structure due to an earthquake, the vibration detector detects the vibration and detects a vibration component as an electric signal. For the detected vibration component, the direction of increase or decrease of the vibration component is determined by the direction discriminator, and the magnitude of the vibration component is detected by the level detector. 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 component discriminates the vibration component to the pulse current generator. Is sent as a signal. These two signals
The pulse signal generator is connected directly to the drive or
Sending a pulsed constant drive current signal through the band,
The driving device is pulsed by the driving current signal to the additional weight.
Give a certain driving force. The driving force attaches to the structure.
A reaction force based on the inertia force of the weight is given, and the structure vibrates.
Is reduced.

(3) Embodiment An embodiment of a vibration suppressing device with an automatic control mechanism according to the present invention is shown in the drawings.
It will be described based on. 1 and 2 show an automatic vibration suppressing device according to one embodiment.

(Structure of the embodiment) This vibration suppression device S with an automatic control mechanism is
The vibration damping device 1 is mainly composed of an additional weight 3 and includes an operating mechanism for driving the additional weight 3. The detection processing device 2 detects input vibration and detects the input vibration. After performing signal processing, a drive signal is sent to the operating mechanism of the vibration damping device 1.

Hereinafter, the configuration of each part will be described in detail. In the vibration damping device 1, a casing 1 having a rectangular box shape is provided.
Reference numeral 0 denotes a flat bottom plate 11, a rectangular frame-shaped outer frame body 12, and an upper lid 13 having a predetermined rigidity, forms an accommodation space therein , and is fixed to the floor of the structure with the bottom plate 11. A vertical leaf spring member 15 fixed to two opposite sides of the outer frame body 12 and a horizontal leaf spring member 16 fixed to the other two sides in the outer frame body 12 of the casing 10.
, An inner frame 17 similar to the outer frame 12 is disposed. The inner frame 17 also maintains rigidity. The vertical leaf spring 15 is the middle frame 1
7 has the function of movably supporting the horizontal leaf spring 16.
Allows movement in only one direction due to its lateral stiffness. In this embodiment, the vertical leaf springs 15 are composed of a pair of mutually opposing leaf spring elements. However, even if they are arranged in the same direction, there is no functional change, and the horizontal leaf springs 16 are also provided on each side. Although two sheets are arranged, the number is not limited.

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

With this configuration, the inner frame 17 is allowed to move in one direction (Y direction in the drawing) on the plane, and the weight 3 is moved in the other direction (in the drawing) with respect to the inner frame 17. (X direction) is allowed, so that XY
Displacement is freely allowed in all directions of the plane. Further, since the inner frame 17 and the weight 3 are supported and regulated by the leaf spring, they have a characteristic that they can be moved with extremely small force.

Reference numeral 22 denotes a damping portion, which is a concave portion 23 provided on the upper surface of the weight portion 3, a disk-shaped resistance plate 25 at a lower end of a support rod 24 attached to the upper cover 13 of the casing 10, and a concave portion. 23, and a viscous fluid L filled therein. Recess 2
3 and the lower surface of the resistance plate 25 are maintained at a predetermined interval s, and a viscous fluid generated by a viscous fluid L interposed therebetween .
Have cross resistance to damp the vibration of the weight portion 3.

Reference numeral 100 denotes a drive unit as an operating mechanism provided in the vibration damping unit 1, which is in the form of an electromagnet.
The inner frame 17 disposed between the outer frame 12 and the inner frame 17
It comprises a primary electromagnet 100A that drives in the direction, and a secondary electromagnet 100B that is arranged between the inner frame 17 and the weight 3 and drives the weight 3 in the X direction. Each electromagnet 100A, 1
00B are arranged as a set of two pieces opposing each other with the center of the weight portion 3 interposed therebetween. Also, each electromagnet 100 has a pair of poles 10.
0a and 100b are arranged opposite to each other and are made of a homopolar body,
A repulsive force is generated with energization. The pair of electromagnetic actuators 100 are not energized at the same time, and one energization is not energized. The electromagnetic actuator 100 is electrically connected to the detection processing unit 2, in particular, a signal amplifier to be described later via electric wiring.

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

Detection Processing Unit 2 In the detection processing unit 2 , reference numeral 110 denotes a vibration detector (arranged in the structure), (arranged on the ground), and acceleration and velocity of vibration input to the structure. , One or more vibration components among the vibration components such as displacements are detected and extracted as time elapses as electric signals such as voltage. These vibration components are decomposed in two axial directions and detected as respective axial components. The vibration component signal detected by the vibration detector 110 is sent to a direction discriminator (signal discriminator) 120 and a level detector 130.

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

Reference numeral 140 denotes a pulse signal generator, which generates a drive signal (usually a current pulse) of a constant level in a pulsed manner based on the signal output from the level detector 130 while the signal lasts. . The pulse drive signal has a constant magnitude and outputs a predetermined number of pulses per unit time. This
In the signal generator 140 of FIG.
In response to the signal of 0, each electromagnet 100 (4 in this embodiment)
The switching of the current to is performed. The output amplifier 150 is provided if necessary, amplifies the output signal from the signal generator 140, and sends the amplified signal to the electromagnet 100.

(Operation and Effect of the Embodiment) The vibration suppressing device S with the automatic control mechanism of the present embodiment configured as described above operates as follows. Now, when an external force such as an earthquake or a wind load acts on a structure and a vibration occurs in the structure, the vibration detector 110 detects the vibration in two axial directions and detects a vibration component as an electric signal. .
The directions of the detected vibration components in the two axial directions are determined by the direction determiner 120 , and the magnitude of the vibration components is detected by the level detector 130. When the magnitude of the vibration component detected by the level detector 130 exceeds a preset level, the level detector 1
30 to the pulse signal generator 140, and the direction discriminator 120 outputs the signal to the pulse signal generator 140.
The direction of the vibration component is sent as a signal. With these two signals, the pulse signal generator 140 causes each of the electromagnets 100A, 10A
At OB, a pulsed constant level drive signal is sent through output amplifier 150 for the signal duration at level detector 130. Each of the electromagnets 100A, 10A
0B applies a constant pulse-like electromagnetic force to the additional weight 3 in the X direction and the Y direction, 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 vibration of the structure is reduced. Further, the vibration control of the automatic vibration suppression device S is performed.
Since the damping section 22 is added to the device section 1, the inertia force
The excessive weight 3 can be prevented from moving excessively due to
You.

As described above, according to the vibration suppressing device with the automatic control mechanism of this embodiment, the direction and magnitude of the input vibration are detected.
When the magnitude of the input vibration exceeds a predetermined level, a constant pulse-like electromagnetic driving force is applied to the additional weight 3 in a direction opposite to the direction of the input vibration, regardless of the magnitude of the input vibration. , The driving force of the electromagnet 100 can be small, and therefore, the driving source can be small and the structure can be simple, and the reliability can be improved.

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the basic technical concept of the present invention.

C. According to the vibration suppression device with the automatic control mechanism of the present invention,
In the device section, the vertical and horizontal leaf springs are combined.
Each frame moves independently because it has two frames
Allows the additional weight to move freely in all horizontal directions.
In addition, due to the use of a leaf spring, this movement
Is achieved. In addition, the detection processing unit detects only the direction and magnitude of the input vibration, and when the magnitude of the input vibration exceeds a predetermined level, regardless of the magnitude of the input vibration, the direction is opposite to the direction of the input vibration. Since the pulse-like constant driving force is applied to the additional weight in small increments, the driving force source of the electromagnetic device is small, and the device as a whole has a simple structure.
Thus, reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (a cross-sectional view taken along a line II in FIG. 2) illustrating an overall configuration of an embodiment of a vibration suppression device with an automatic control mechanism according to the present invention.

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

[Description of Signs] S: Vibration suppression device with automatic control mechanism, 1: Vibration suppression device unit,
2 ... Detection processing unit, 3 ... Additional weight, 12 ... Outer frame, 1
5,19 ... vertical leaf spring, 16,20 ... horizontal leaf spring,
17 ... inner frame, 100 ... electromagnet, 110 ... vibration detector,
120: code discriminator, 130: level detector, 140 ...
Signal generator, 150 ... Signal amplifier

Claims (2)

(57) [Claims] 1. Acting on a structure using the inertia force of an additional weight
By applying a reaction force in the direction to cancel the
In a vibration suppressing device that reduces vibration acting on a structure, the additional weight is held and the additional weight is driven.
Control device including an operating mechanism, and operation in the vibration control device
A detection processing unit for sending a signal to a mechanism, wherein the vibration damping unit comprises: (a) an additional weight having a substantially rectangular parallelepiped shape; and (b) a predetermined distance between four sides of a side surface of the additional weight. Parallel with
And have a substantially quadrilateral shape.
The additional weight is supported by the vertical leaf springs arranged on the sides,
On the other two opposite sides, a horizontal plate
Preparative four sides of (c) the inner frame member in parallel form with a predetermined interval; inner frame member and formed by arranging roots
Surround, have a substantially quadrilateral shape, and are arranged on two opposite sides.
The inner frame is supported by the set vertical leaf spring, and the other
A horizontal leaf spring is arranged between the two opposing sides with the inner frame.
And an outer frame fixed to a structure to be damped. The inner frame and the outer frame move relative to each other in an orthogonal manner.
And a horizontal plate between the inner frame and the outer frame.
On the side where the pulse is driven by the pulse drive current
Will be arranged magnetic drive device, the detecting device section, (a) the acceleration of the vibrations acting on the structure, speed, and vibration detector for detecting at least one vibration component in the displacement; (b) the A direction discriminator for discriminating an increase / decrease direction of a vibration component detected by the vibration detector; (c) a level detector for detecting the magnitude of the vibration component detected by the vibration detector; (d) the level detection A signal generator for generating a drive signal of a constant level in a pulse form when the magnitude of the vibration component detected by the detector exceeds a predetermined level; and a signal generator of the detection processing unit. The constant
The level of the pulse drive current causes the electromagnetic
Activate the driving device and determine the direction of the additional weight.
The direction opposite to the direction of the vibration component determined by the
A vibration suppressing device with an automatic control mechanism , which applies a force . 2. The vibration suppressor with an automatic control mechanism 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 .