JPH06240924A - Vibration control device - Google Patents

Abstract

PURPOSE:To provide a compact vibration control device by fitting a mass body to the one end of a plate spring whose other end has been fixed to the floor, and by supporting the plate spring between the mass body and the fixed end thereof by means of a pin, and also by fitting a damper between the mass body and the floor. CONSTITUTION:One end of a horizontal plate spring 3 is fixed to a base seat 2 that has been rigidly installed on a floor 1, and a mass body 4 and a damper 5 are fitted to the other end thereof. Then, the intermediate part between the mass body 4 in the spring 3 and the fixing end of the spring to be fixed to the base seat 2 is supported by a pin 6 so that the spring 3 can be restrained from being deformed up and down in this position, and the pin 6 is arranged so as to be movable in the longitudinal direction of the spring 3 on the base seat 2. The device functions as a dynamic vibration damper by moving and adjusting the position of the pin 6 for adjusting the natural frequency, and for adjusting the amount of damping of the damper 5. Thus, a more compact vibration control device can be obtained without requiring a weight or spring for adjustment, and also without requiring the movement of a heavy weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device used as a dynamic vibration reducer for suppressing vertical vibration of a large span floor, a large span beam, a bridge and the like.

[0002]

2. Description of the Related Art A dynamic vibration absorber is a vibration system in which a mass, a spring, and a damper are combined. By appropriately adjusting the natural frequency and the damping constant, a floor to which the dynamic vibration absorber is attached, It is a device that reduces vibration. FIG. 5 shows an example of a conventional dynamic vibration reducer, in which a mass a is supported by a floor c which is a mounting base of a vibration damping device via a coil spring b, and a damper d is interposed between the floor c and the mass a. It is equipped.

In order to adjust the frequency of this dynamic vibration absorber, a method of replacing with a coil spring having a different spring constant, increasing or decreasing the number of coil springs, or increasing or decreasing the weight of the mass by an additional mass e is considered. To be FIG. 6 shows another example of a conventional dynamic vibration reducer, in which one end of a lever f has a floor c.
A support h provided above is supported by a pin h or a torsion bar, a mass i is movably attached in the middle of a lever f, a spring j is attached to a support portion of the lever f, and a damper is provided at the tip. k is attached.

In this dynamic vibration reducer, the natural frequency is adjusted by moving the position of the mass on the lever. FIG. 7 shows still another conventional dynamic vibration reducer, which is an improvement of the dynamic vibration reducer shown in FIG. 6, in which the frequency adjusting mass m is movably attached to the lever f, The frequency is adjusted by moving along the lever.

[0005]

However, in the dynamic vibration reducer shown in FIG. 5, it is necessary to prepare some springs or weights for adjustment in order to adjust the natural frequency. Many of them are useless because they become unnecessary after the adjustment. Further, in the dynamic vibration absorber shown in FIG. 6, the mass on the lever is moved to adjust the natural frequency,
Large masses are not easy to move and difficult to adjust.

Further, in the dynamic vibration reducer shown in FIG. 7, the lever becomes long, which may restrict the installation when it is attached to the floor or the beam. The present invention has been proposed in view of the above problems of the prior art, the objective of the present invention, there is no need for adjustment weights or springs, it is not necessary to move the heavy weight,
The point is to provide a more compact vibration damping device.

[0007]

In order to achieve the above-mentioned object, a vibration damping device according to the present invention has a mass attached to the other end of a plate spring whose one end is fixed to a floor and a beam. A pin is movably supported between the mass and the fixed end of the plate spring, and a damper is attached between the plate spring or the mass and the floor or beam.

[0008]

Since the vibration damping device according to the present invention is constructed as described above, one end of the leaf spring, one end of which is fixed to the floor and the beam and the other end of which is attached to the mass, is vertically moved in the event of an earthquake or the like. The natural frequency is adjusted by vibrating and adjusting the pin support position between the fixed end portion of the leaf spring and the mass attachment portion. Further, the damping constant is adjusted by the leaf spring or the damper arranged between the mass and the mounting base.

[0009]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows a first embodiment of the present invention. One end of a horizontal leaf spring 3 is fixed to a pedestal 2 rigidly installed on a floor 1, and a mass 4 and a damper 5 are attached to the other end. ing.

An intermediate portion between the mass 4 of the leaf spring 3 and the fixed end with respect to the pedestal 2 is supported by a pin 6, and the leaf spring 3 is prevented from vertically deforming at this position. The pin 6 is arranged on the base 2 so as to be movable along the longitudinal direction of the leaf spring 3. Since the illustrated embodiment is configured as described above, the position of the pin 6 is moved and adjusted to adjust the natural frequency, and the damping amount of the damper 5 is adjusted so that the illustrated device is a dynamic vibration absorber. Work as.

2 to 4 show a second embodiment of the present invention in which the present invention is applied to an H-shaped beam. One end of a leaf spring 7 is attached to a fixing portion 9 of a web 8 of the beam. A mass 10 is attached to the other end of the leaf spring 7, and a damper 11 is attached between the leaf spring 7 and the lower flange 12 of the beam. Between the mass 10 and the fixing portion 9 of the leaf spring 7, the pin fixing portion 1 provided on the web 8 of the beam is projected.
Up and down movement of the leaf spring 7 is suppressed by the pin 14 mounted on the pin 3. The pin 14 is movable in the beam material axial direction. Further, an additional spring 16 is attached between the upper flange 15 and the lower flange 12 of the beam of the mass 10.

The additional spring 16 is used for connecting the mass 10 to the leaf spring 7.
Is attached as an auxiliary member when it cannot be supported, or for increasing the natural frequency of the dynamic vibration reducer. In the above embodiment, by moving the position of the pin 14,
The frequency of this dynamic vibration absorber can be adjusted.

[0013]

As described above, in the vibration damping device according to the present invention, a mass is attached to the other end of a plate spring whose one end is fixed on the floor and the beam, and the mass is fixed between the mass and the fixed end of the plate spring. Pin support so that it can move freely, leaf spring, or mass and the floor,
Since the damper is attached between the beam and the beam, it is not necessary to prepare a weight or spring for adjustment, and it is not necessary to move a heavy mass, so that the structure becomes more compact.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a vibration damping device according to the present invention.

FIG. 2 is a front view showing a second embodiment of the vibration damping device according to the present invention.

FIG. 3 is an arrow view diagram of FIG.

FIG. 4 is a view showing an arrow roll of FIG.

FIG. 5 is a front view showing an example of a conventional vibration damping device.

FIG. 6 is a front view showing another example of a conventional vibration damping device.

FIG. 7 is a front view showing still another example of the conventional vibration damping device.

[Explanation of symbols]

 1 floor 2 pedestal 3 leaf spring 4 mass 5 damper 6 pin 7 leaf spring 8 web 9 fixed part 10 mass 11 damper 12 lower flange 13 pin fixed part 14 pin 15 upper flange 16 additional spring

Claims (1)

[Claims] 1. A mass is attached to the other end of a plate spring having one end fixed to a floor and a beam, and the plate spring is supported by a pin so as to be movable between the mass and the fixed end of the plate spring. Also, a vibration damping device is characterized in that a damper is attached between the leaf spring or the mass and the floor and the beam.