JPH0428934B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for reducing vibrations of vibrating objects such as high-rise buildings such as buildings, towers, and antennas, and elevated roads.

[Prior art]

For example, as shown in FIG. 1, a high-rise building is constructed on a surface stratum 3 such that the lower part of the building 1 is supported by a bedrock 2. In this type of high-rise buildings, excessive external forces are applied due to fluctuations in wind pressure and vibrations of the bedrock 2 during earthquakes, and this is combined with a decrease in bending rigidity due to the increase in the height of buildings.
Extremely large vibrations are induced in the building 1. Such excessive vibrations cause damage to high-rise buildings, discomfort to people living in high-rise buildings, and the resulting health problems. Furthermore, vibration propagation to the ground shakes nearby buildings, residences, etc., and causes vibration pollution, such as causing great discomfort to nearby residents. To reduce the vibrations generated in such high-rise buildings, conventional measures have been taken such as reinforcing the building to increase its rigidity or installing dampers at the ends of reinforcing ropes, but these measures are not fundamental. I wasn't there.

Therefore, as a solution to this problem, a mass damper type vibration control device shown in FIG. 2 has been proposed. FIG. 2 is a configuration diagram showing a conventional vibration control device.
In the figure, 4 is a vibrating object, 5 is a sensor that detects the amount of vibration of this vibrating object, 6 is a control device that outputs a control signal based on the detection signal of this sensor, and 7 is a control force that is generated based on the control signal of this control device. A drive device, 8 is a mounting shaft that connects this drive device and the additional mass 9, and 10 is a wheel that supports the additional mass 9 on the vibrating object 4.

In the vibration control device configured as described above, when a vibration F(t) shown by arrow A occurs in the vibrating object 4, the sensor 5 detects this, and the detection signal is sent to the control device 6. The control device 6 issues a control signal to the drive device 7, and the drive device 7 generates a control force F(t) shown by arrow B. This control force F(t)
is given by the following equation.

F(t)=-CZ·(t)...(1) In the equation (1), Z(t) is the displacement of the vibrating object 4, C is the gain of the velocity feedback, and the symbol . represents the differentiation with respect to time. The generated control force F(t) is applied to the vibrating object 4 and is balanced by moving the additional mass 9 via the mounting shaft 8. The balance of this force can be expressed as mdZ‥d=F(t)...(2). Here, md is the added mass and Zd is the displacement of the added mass. Now, when vibration occurs in the vibrating object 4, a control force is generated depending on the magnitude of the vibration, but as is clear from equation (2), the control force is balanced by the inertia of the additional mass. It will involve movement.

Since the conventional vibration control device is configured as described above, it has a drawback that when the vibration of the vibrating object 4 becomes larger than the designed value, the additional mass 9 collides with the drive device 7, resulting in damage to the device.

[Summary of the invention]

This invention was made for the purpose of eliminating the drawbacks of the conventional ones as described above, and by providing a stopper that restricts excessive movement of the additional mass and a buffer member that absorbs the impact force of the additional mass on the stopper, An object of the present invention is to provide a vibration control device that can prevent damage to the device by absorbing the impact force generated by vibrations exceeding the controlled range.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing an embodiment of the present invention, and in the figure, the same reference numerals as in FIG. 2 indicate the same or corresponding parts. The mounting shaft 8 projects from the drive 7 through the additional mass 9 to the opposite side. A stopper 11 is provided between the protruding end of the mounting shaft 8, the drive device 7, and the additional mass 9, facing the additional mass 9. 11a is a support cylinder provided on the surface facing the additional mass 9 of this stopper, 11b is a donut-shaped vibration isolating rubber that is supported by this support cylinder and extends toward the mounting shaft 8, and 11c is a tip of this vibration isolator. It is a front cylinder that is supported so as to surround the mounting shaft 8 and forms the front surface of the stopper.

In the vibration control device configured as described above, when the vibration indicated by arrow A occurs in the vibrating object 4, the sensor 5 detects this, and the detection signal is sent to the control device 6. The control device 6 outputs a control signal to the drive device 7 to generate a control force F(t) indicated by an arrow B and apply it to the vibrating object 4. At this time, the additional mass 9 moves to balance this force. When the movement of the additional mass 9 is small, the additional mass 9 does not collide with the front cylinder 11c of the stopper 11, and the vibration control device operates in the same manner as the conventional vibration control device shown in FIG. However, when a large vibration occurs in the vibrating object 4, the movement of the additional mass 9 also increases, and finally the front cylinder 11 of the stopper 11
The additional mass 9 collides with c. However, the front cylinder 1
1c is a vibration-proof rubber 11 having an elastic action and a damping action.
b, the movement of the additional mass 9 is absorbed by the vibration isolating rubber 11b, and as a result, no large impact force is generated. At this time, the impact force acts in the tensile direction of the vibration isolating rubber and is transmitted from the front cylinder to the supporting cylinder via the donut-shaped vibration isolating rubber.
Since the impact force is evenly distributed and absorbed, the impact force absorption effect is high. This invention is applicable not only to high-rise buildings but also to all vibrating objects.

〔Effect of the invention〕

As described above, according to the present invention, since the stopper that restricts excessive movement of the additional mass and the buffer member that absorbs the impact force of the additional mass are provided, the impact force caused by the collision of the additional mass can be absorbed. Therefore, vibration isolation control can be performed while preventing damage to the device. At this time, the impact force due to the collision of the additional mass acts in the tensile direction of the vibration isolating rubber and is transmitted from the front cylinder to the support cylinder via the donut-shaped vibration isolator, so the impact force is evenly distributed and effective. be absorbed into. Therefore, it has an excellent damping effect and a high effect of preventing damage to the device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a high-rise building, FIG. 2 is a block diagram of a conventional vibration control device, and FIG. 3 is a block diagram of an embodiment of the present invention. In each figure, the same reference numerals indicate the same or equivalent parts, 4 is a vibrating object, 5 is a sensor, 6 is a control device, 7 is a drive device, 8 is a mounting shaft, 9 is an additional mass,
10 is a wheel, and 11 is a stopper.

Claims (1)

[Claims] 1. A detection means for detecting the amount of vibration of a vibrating object, a drive device for applying a control force corresponding to the amount of vibration detected by the detection means to the vibrating object, and a drive device for applying the control force to the vibrating object. A vibration control device that has an additional mass that achieves force balance, a wheel that supports the additional mass on a vibrating object, and a mounting shaft that connects the drive device and the additional mass and projects on the opposite side from the additional mass. , a stopper provided on both sides of the additional mass of this mounting shaft to restrict excessive movement of the additional mass, a support cylinder provided on the surface of this stopper facing the additional mass, and a support cylinder supported by this support cylinder. A shock absorbing member made of donut-shaped anti-vibration rubber that extends toward the mounting shaft so as to absorb the impact force of the added mass against the stopper through elastic action and damping action, and a shock absorbing member made of donut-shaped vibration isolating rubber that extends toward the mounting shaft to surround the mounting shaft on the inner periphery of the shock absorbing member. A vibration control device comprising: a front cylinder supported to form a front surface of a stopper.