JPH06264645A - Damping device - Google Patents

Abstract

PURPOSE:To damp vibrations of a structure, by providing damping devices at a plurality of stories of a multi-storied building. CONSTITUTION:In a damping device 1, the horizontal vibrations of a building 2 are damped down by the dampers 3-1-3-m equipped at a plurality or stories or the building 2 through control signals. At the stories where the dampers 3-1-3-m are equipped, speed sensors 5-1-5-m measuring the speed of the story and controllers 6-1-6-m controlling the damper 3-1-3-m of the story, are provided.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device, and more particularly to a vibration damping device having a structure for damping vibration of a structure on a multi-storey floor by displacing an additional mass.

[0002]

2. Description of the Related Art For example, a structure such as a building is provided with a vibration damping device for damping vibrations caused by an earthquake or wind pressure. As this type of vibration damping device, for example, one disclosed in Japanese Patent Application Laid-Open No. 2-300478 is considered. This is to suppress the vibration of the building by displacing an additional mass having a predetermined weight mainly according to the mass of the building according to the vibration state of the building.

Such a vibration damping device is installed on the rooftop of a building where vibration due to an earthquake, wind pressure, or the like is the largest.

[0004]

In the above-mentioned vibration control device, the vibration control device provided on the roof of the building controls the entire building on the multi-story floor. Therefore, when the building becomes large, the vibration control device is driven accordingly. The mass must be increased, and it is extremely difficult to manufacture it in the factory, transport it from the factory to the site, and install it on the rooftop of the building. There is a problem that adjustment work becomes difficult.

Further, if the vibration damper is downsized, the above problem is solved, but the added mass is also reduced, and it becomes impossible to obtain a sufficient vibration damping effect for the entire building.

Therefore, an object of the present invention is to provide a vibration damping device that solves the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention provides a plurality of vibration dampers provided on a plurality of floors of a multi-story structure for driving a mass to damp the vibrations of the structure, and the vibration damper. Is provided, and a sensor for detecting movement on the same floor, and control means for controlling the drive of the vibration damper based on the output of the sensor.

[0008]

By distributing a plurality of vibration dampers on a plurality of floors of a multi-story structure, each vibration damper can be downsized, and a plurality of vibration dampers can be individually damped. A sufficient damping effect can be obtained for the whole.

[0009]

1 to 3 show an embodiment of a vibration damping device according to the present invention. 2 is a modeled version of FIG.

In each of the drawings, a vibration damping device 1 is generally a vibration damper 3-1 installed on a plurality of floors of a building 2 as a structure of multi-story floors.
.. 3-m respectively suppress the vibrations of the building 2 in the horizontal direction by vibrating in response to the control signals from the control devices 6-1 to 6-m.

The building 2 has a vibration mode of 1 depending on its structure.
Next-order mode, second-order mode, third-order mode ... m-th order mode, and higher-order modes include higher-order mode vibration.
In this embodiment, the vibrations up to the m-th mode are damped, and as shown in FIG. 3, the vibration dampers 3-1 to 3-m are installed under the floor where the vibration does not occur. This is because the displacement becomes zero at the vibration node, and the vibration suppressor does not need to perform the vibration suppressing operation.

Further, below the floor of the floor where the vibration dampers 3-1 to 3-m are installed, speed sensors 5-1 to 5-m for measuring the movement of the floor and vibration damping of the floor. Control devices 6-1 to 6-m for controlling the devices 3-1 to 3-m are provided. Therefore, the vibration dampers 3-1 to 3-m and the speed sensors 5-1 to 5-
m and the control devices 6-1 to 6-m are installed so as to have the same number as the order (m-th order) of the vibration mode to be controlled.

Further, the building 2 and the vibration dampers 3-1 to 3-m.
Should be replaced with a dynamic model as shown in Fig. 2.
You can If the building 2 has n floors, n masses (m_s1
~ M _sn) And n springs (spring constant K
_s1~ K_sn) And the damping element between each floor (viscous damping coefficient C_s1~
C_sn) Is a dynamic model composed of. Also, the vibration damper 3-
1, 3-2 are modeled as a mass ma and a controlled variable u.
It

The vibration dampers 3-1 to 3-m have the same structure, and have the structure shown in FIGS. 4 and 5. The vibration damper 3 is installed in an underfloor space 2c formed between a concrete floor 2a and an upper floor 2b supported above the floor 2a.

The vibration damper 3 has a structure in which an additional mass 8 slides in the X direction on a base 7 fixed to the floor 2a.
Are slidably supported by linear bearings 9 on the base 7. Also, the additional mass 8 is 1 / m of the mass compared to the case where one vibration suppressor is installed on the roof of the building 2,
The size is also reduced to almost 1 / m.

An AC servomotor (hereinafter referred to as a motor) 10 as an actuator and an electromagnetic brake 11 are provided on the base 7, and an output shaft 10 of the motor 10 is provided.
A is connected to a ball screw 15 supported by bearings 13 and 14 via a coupling 12. Ball screw 15
Penetrates by being screwed onto the additional mass 8. Therefore, the additional mass 8 moves in the recess 7 a of the base 7 by the rotation of the ball screw 15.

When the building 2 vibrates due to wind pressure or an earthquake,
As will be described later, the control device 6 calculates a control amount according to the magnitude of vibration and outputs a drive signal to the motor 10 of the vibration damper 3. The motor 10 supplies the drive signal to the ball screw 15
Is rotated to move the additional mass 8 in the X direction (vibration direction). At this time, the reaction of the generated inertial force of the additional mass 8 suppresses the vibration of the building 2.

The electromagnetic brake 11 is in the off state in the vibration damping mode, and brakes the ball screw 15 in the stop mode in which the power is turned off.

Here, each of the control devices 6-1 to 6-m will be described. Since the control devices 6-1 to 6-m have the same configuration, the configuration of the control device 6-1 shown in FIG. 1 will be described.

The respective detection signals from the speed sensor 5-1 and the displacement sensor 18-1 for detecting the displacement of the additional mass 8 are amplified by the servo amplifiers 19a and 19b, and the control device 6-1.
Entered in. The control device 6-1 calculates the magnitude of vibration from the speed of the installed floor.

The control device 6-1 is a CPU 2 for calculating the control amounts for the A / D converter 24 and the vibration damper 3-1 as input parts.
5, a D / A converter 26 as an output unit, and an I / O interface circuit 27. The A / D converter 24 converts the detection signal from each sensor into a digital signal, and the CPU 25
Output to.

The CPU 25 is an A / D converter 24 and an I / O.
The control amount of the vibration damper 3-1 is calculated based on each signal from the interface circuit 27, and is output to the D / A converter 26. The analog signal of the control amount output from the D / A converter 26 is input to the servo driver 29, and the servo driver 29 controls the torque command current as a drive signal according to the control amount calculated by the CPU 25. Output to the motor 10 of the shaker 3-1.

Reference numeral 30 denotes a memory, which stores each program for damping control, and also stores initial values and the like of each calculation required for damping control. A power source 31 is connected to the control device 6-1 and the servo driver 29, and an emergency stop switch 32 is provided between the power source 31 and the servo driver 29. This switch 32 has a normally-closed contact, and for example, when an excessive earthquake occurs, the I / O interface circuit 2
It is excited by the stop signal from 7 and opens.

Reference numeral 34 is a display device, and when there is an abnormality in the control system of the vibration damper 3-1 or each sensor, the contents of the abnormality are displayed to inform the observer. Reference numeral 35 is an alarm device that issues an alarm when an abnormality occurs.

Therefore, the detection signals x1 to xm output from the speed sensors 5-1 to 5-m are the control signals 6-1 to 6-1.
It is converted into a digital signal by the 6-m A / D converter 24 and sent to the CPU 25. In the CPU 25, the target value x1r
= ... = xmr = 0, and the control amount is obtained by changing the signal strength at a constant rate by the amplifier. CPU2
The control amount obtained in 5 is converted into an analog signal by the D / A converter 26 and output to the servo driver 29, and the motor 10 is drive-controlled by the signal.

Next, regarding the processing executed by the CPU 25 of the control device 6-1 when the vibration damping device 1 performs the vibration damping operation,
This will be described with reference to FIG.

The CPU 25 executes the processing of FIG. 6 every 5 msec, for example.

In FIG. 6, the CPU 2 of the control device 6-1
In step S1, the vibration control system is checked for abnormality in step S1 (the following steps will be omitted). For example, it is checked whether or not there is any abnormality in the control system of the vibration suppressor 3-1 and the sensors 5-1 and 18-1, and if there is no abnormality in S2, the process proceeds to S3 and the above sensors 5-1 and 18-1. Read the detection signal from.

That is, in S3, the speed of the floor where the vibration damper 3-1 is installed and the speed of the additional mass 8 of the vibration damper 3-1 are read.

In the next S4, the control amount u is calculated based on the data read in S3, and the control amount u is output to the motor 10 of the vibration damper 3-1 in S5. That is, in S4, the control amount u is calculated so that the difference between the detection signal x1 output from the speed sensor 5-1 and the target value x1r becomes zero. However, when the building 2 is not vibrating, the sensor 5-
Since the output of 1 is zero, the controlled variable u becomes zero in S5,
The vibration damper 3-1 does not perform the vibration damping operation.

Further, in S2 described above, the vibration damper 3-1 is used.
Or, when there is an abnormality in the sensors 5-1 and 18-1, S
6, the controlled variable u to the vibration damper 3-1 is set to zero.

The control unit other than the control unit 6-1 also executes the same processing as described above, and the respective vibration dampers 3-1 to 3-3-
Depending on the speed of the floor where m is installed, each vibration suppressor 3-
Control is performed so that the vibration damping operation is individually performed for each of 1 to 3-m. In this way, the plurality of vibration dampers 3-1 to 3-m individually perform the vibration damping operation, whereby the vibration of the building 2 on the multi-story floor is wholly damped.

Therefore, in this embodiment, a plurality of vibration dampers 3-1 to 3-m are installed under the floor of the building 2 in a distributed manner. The mass 8 can be made much smaller and the weight can be reduced, which facilitates production in the factory, improves production efficiency, reduces the work when installing it in the building 2, and facilitates the adjustment work in a shorter time. It is possible to install. Further, each of the vibration dampers 3-1 to 3-m of the present embodiment is installed only on the conventional rooftop because it is only controlled to eliminate the movement of the floor (vibration due to earthquake, wind, etc.). It is not necessary to perform the vibration damping control (control for suppressing the first to mth vibrations that occur in the building) performed by the vibration damping device. Therefore, it is possible to reduce the amount of calculation for controlling the vibration suppression as compared with the conventional case.

Of course, instead of the CPU 25, an analog circuit may be used to control the respective vibration dampers 3-1 to 3-m. In that case, the detection signals x output from the speed sensors 5-1 to 5-m installed in the building 2
1 to xm take the difference from the target value x1r = ... = xmr = 0 by the analog circuit in each control device 6-1 to 6-m,
The strength of the signal is changed at a constant rate by an analog amplifier to obtain a control signal, which drives and controls the motor 10.

In the above embodiment, the vibration dampers 3-1 to 3-3-
Although m has been described as being installed under the floor, the present invention is not limited to this and may be installed in a place other than this (for example, in a wall).

Further, it goes without saying that the number of installed vibration suppressors 3-1 to 3-m may be determined regardless of the vibration mode of the building 2. For example, in the building on the 20th floor, 3 vibration dampers are installed on the 6th floor, 1
It may be installed on the 2nd floor and the 18th floor at equal intervals.
In this case, it is desirable to install it in a place that does not become a node of vibration.

Further, in the above embodiment, the speed sensors 5-1 to 5-m for detecting the movement of the floor where the vibration damper is provided are used, but the present invention is not limited to this, and the speed sensor is used instead. Alternatively, the motion may be detected using an acceleration sensor or a displacement sensor that detects displacement.

[0038]

As described above, the damping device according to the present invention is
By distributing multiple dampers on multiple floors of a multi-story structure, it is possible to reduce the size of the damper and at the same time, the individual dampers can suppress vibrations, which is sufficient for the entire structure. Damping effect can be obtained. Also, since the added mass of the vibration damper can be considerably reduced and the weight can be reduced, production in the factory is facilitated, production efficiency is improved, and the work when installing it on the structure is reduced, and the adjustment work is also easy. It has the advantage that it can be installed in a shorter time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a vibration damping device according to the present invention.

FIG. 2 is a diagram showing a dynamic model of a building.

FIG. 3 is a diagram showing installation locations of a vibration damper for a vibration mode.

FIG. 4 is a front view of the vibration damper.

FIG. 5 is a vertical sectional view of a vibration damper.

FIG. 6 is a flowchart executed by the CPU of the control device.

[Explanation of symbols]

 1 Vibration Control Device 2 Building 5-1 to 5-m Speed Sensor 3-1 to 3-m Vibration Control Device 6-1 to 6-m Control Device 8 Additional Mass 10 AC Servo Motor 18-1 to 18-m Displacement Sensor 25 CPU

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mitsuru Kageyama 4-640 Shimoseido, Kiyose-shi, Tokyo Inside Obayashi Institute of Technology Co., Ltd. (72) Inventor Tatsuya Gankai 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokico Co., Ltd.

Claims (1)

[Claims] 1. A plurality of vibration dampers provided on a plurality of floors of a multi-story structure for driving a mass to suppress vibrations of the structure, and movements of the same floor on which the vibration dampers are provided. A vibration damping device, comprising: a sensor that detects a vibration damping force; and a control unit that controls driving of the vibration damping device based on the output of the sensor.