JP2001355672A - Particle vibration-isolating damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suitable vibration control device for a machine/structure in a simple constitution without the necessity of separately providing a supporting structure of a spring, rubber vibration isolator or the like. SOLUTION: This device is provided with a float provided at a tip of a supporting member for directly supporting the machine/structure and a particle damper container or storing particle and slidably supporting the float by the particle and absorbs vibration of the float by energy dissipation due to a collision of the particle filled around the float.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator that absorbs vibration of equipment such as a building or bridge structure or an engine, a motor, a blower, or a pump by dissipating energy due to collision of particles.

[0002]

2. Description of the Related Art As a device for absorbing vibration energy, a damper in which an elastic body such as rubber or a viscous fluid such as oil is combined with an elastic body such as a coil spring is known.
In the case of such a structure, since the viscous fluid itself does not have a supporting force, in order to support the object, it is necessary to provide a supporting structure for separately providing a supporting force by a spring or a vibration-proof rubber.

Japanese Unexamined Patent Publication No. Hei 10-31163 proposes a vibration-isolating floor using a granular cushioning material instead of a viscous fluid. However, even in such a structure, there is provided a structure in which the granular cushioning material is included in an elastic container. By doing so, it has a structure to maintain the supporting force. Japanese Patent Application Laid-Open No. 8-219377 discloses an anti-vibration device interposed between an engine of a ship and a hull structure. However, a comb-shaped resistor is provided in a granular material, and the resistor is moved according to the movement of the resistor. Vibration suppression using a resistive force generated by the reaction force of a granular material being displaced is disclosed, but a configuration for supporting a load of a structure is not disclosed. Nor does it discuss energy dissipation due to particle collisions.

[0004]

However, in such a structure, a spring or rubber is used as a supporting structure for providing a supporting force, but this kind of supporting structure is inherent in supporting an object. Resonates with the frequency. Therefore, when supporting a vibrating object, consideration must be given to avoid this resonance. In addition, the spring or rubber may have a large deflection, and there is a problem that the anti-vibration support structure must be designed in consideration of these factors.

The present invention solves these problems by distributing and supporting the weight of a machine or structure to particles to secure a supporting force and to use a damping force of particles. It is an object of the present invention to provide a vibration isolator having a simple structure without a support structure using a spring or rubber, having a damping effect.

[0006]

In order to achieve the above-mentioned object, a vibration isolator according to the present invention is a vibration isolator for absorbing vibration of a machine / structure, and a support for directly supporting the machine / structure. A float provided at the tip of the member, comprising a particle damper container that contains particles and slidably supports the float with the particles, energy dissipation by collision of the particles filling the periphery of the float, It is characterized by absorbing vibration of the float.

According to the present invention, the load of the machine / structure can be dispersed and supported by the particles disposed below the float, and when vibration occurs, the energy due to the collision of the particles disposed above and below the float is generated. Due to the dissipation, a damping force against vertical vibration can be obtained.

Further, the vibration isolator of the present invention is characterized in that a partition plate is provided on a horizontal surface of the float. ADVANTAGE OF THE INVENTION According to this invention, it can prevent that a particle moves up and down a float, and raises and lowers a float.

Further, the vibration isolator of the present invention is characterized in that the float is supported by the partition plate. ADVANTAGE OF THE INVENTION According to this invention, while being able to prevent ups and downs of a float, the position of the float in a particle can be stabilized and it can be set as the structure which can endure a heavy load.

Further, in the vibration isolator according to the present invention, the float is formed of an upper and lower conical portion having a bottom surface attached to each other, and a difference is provided between the inclinations of the upper and lower conical portions so as to provide a difference in the damping force in the vertical direction. It is characterized by the following. According to the present invention,
Since the contact area between the float and the particles can be made different between the upper and lower parts, the damping force in the vertical direction can be made different.

Further, the vibration isolator of the present invention is characterized in that a distinct resonance frequency is eliminated by increasing the particle diameter of the particles contained in the particle damper container. According to the present invention, the size, density, etc., eliminate a distinct resonance frequency by mixing several types of particles,
Vibration can be suppressed in a wide frequency range.

Further, the vibration isolator according to the present invention is characterized in that a viscous fluid is filled between particles contained in the particle damper container. According to the present invention, the damping force can be further added by the viscous fluid filled between the particles.

[0013]

FIG. 1 is a sectional side view showing a vibration isolator 1 according to an embodiment of the present invention. Vibration isolation device 1
Is composed of a support member 2, a damper container 3, and a support column 4 for connecting and supporting these members. The support member 2 is a structure or an engine, such as a building or a bridge, that generates vibration,
It directly supports various vibration devices such as motors, blowers, and pumps. Particles 5, a float 6 and a partition plate 7 are accommodated in the damper container 3, and the float 6 is attached to the tip of a column 4 slidably inserted through a through hole in the upper part of the damper container 3.
And the float 6 is dispersed and supported by the particles 5. In order to prevent the particles 5 from moving up and down on the float 6 and causing the float 6 to move up and down, a partition plate 7 for blocking the vertical movement of the particles 5 is provided at a substantially intermediate portion in the height direction of the float 6.

The support member 2 and the support column 4 are members for directly supporting loads such as construction and machinery, but may be formed integrally with the float 6 or may be separately assembled. In the present embodiment, the support is made up of one support 4, but it is also possible to insert a plurality of support supports by providing a plurality of through-holes in the upper part of the damper container. It is also possible to insert into a plurality of damper containers.

As the particles 5, various particles such as iron balls, coal ash sintered particles, sludge sintered particles, dust melting slag, etc. can be used.
The sizes and densities do not need to be uniform, and it is possible to adopt a configuration in which a clear resonance frequency is eliminated by mixing several types of sizes and densities. Further, the damping force can be adjusted by changing the size, density, and the like of the particles. Furthermore, by filling the space between the particles 5, that is, in the particle damper container 3, it is possible to add a damping force due to the viscous fluid.

The float 6 has a shape for dispersing and supporting a load on the particles 5, and for example, a simple flat body or a sphere is used. In this embodiment, the shape is a soloban ball shape (a shape in which the bottom surfaces of the conical shapes are integrally bonded), and a difference is provided in the inclination of the two conical shapes so that the damping force in the vertical direction has a difference. It is.

The partition plate 7 not only blocks the vertical movement of the particles, but also supports the load of the float 6 by the partition plate 7, thereby stabilizing the position of the float 6 and dispersing it evenly to the particles 5. The structure can be loaded and can withstand a large load. The configuration in which the load of the float 6 is supported by the partition plate 7 may be such that the partition plate is fixed to the float 6 or a hole smaller in diameter than the float 6 is provided in the partition plate. It is configured to be dispersedly loaded.

According to such a vibration isolation device 1, for example,
When a vibrating machine is supported, when the machine is stopped and no vibration is generated, the load transmitted from the support member 2 to the float 6 via the column 4 is the particle 5 in the particle damper container 3.
And is stably held without a separate support structure. When the machine starts operating and generates vibration, the vibration transmitted from the support member 2 via the support column 4 is transmitted to the float 6, and the vibration is transmitted from the float 6 to the particles 5 in the particle damper container 3 to cause collision between the particles 5. Energy is dissipated by the collision of the particles 5 and a damping force acts.
Similarly, when the vibrating side is the base side, that is, when the base side vibrates due to an earthquake or the like, energy is dissipated by the collision of the particles 5 and a damping force acts.

FIG. 2 is a graph showing experimental results for confirming the damping effect of the present inventor. The horizontal axis represents the vibration frequency, the vertical axis represents the acceleration, and the base side and the damper output (post 4). Sides were compared. In the experiment, a diameter of about 10 to 15 m composed of coal ash sintered particles was placed in an iron particle damper container.
m particles are accommodated, a column is inserted from the upper through hole, and a flat float is attached to the tip of the support member,
The float was supported by the particles. In this experimental device, no partition plate was provided.

Vibration was applied to the foundation to which the particle damper container was fixed, and the output from the support 4 via the damper was measured to confirm the damping action. As a result, when vibration of white noise including a frequency up to 2000 Hz was applied, With the output via, the damping effect was confirmed in a wide range of frequencies, and no clear resonance frequency appeared.

[0021]

As described above, in the vibration isolator according to the present invention, the load of the machine / structure can be dispersed and supported by the particles disposed below the float. The energy dissipated by the collision of the particles arranged in the vertical direction can provide a damping force against the vertical vibration. By using a partition plate, particles can be prevented from moving up and down the float, causing the float to float and sink, and the structure of the float can be stabilized in the particles and can withstand large loads. Can be.

By changing the shape of the flow between the upper and lower parts, the contact area between the float and the particles can be made different between the upper and lower parts, so that the damping force in the vertical direction can be made different. By mixing several types of particles, such as the size and density of the particles, a clear resonance frequency can be eliminated and vibration can be suppressed in a wide frequency range. When a viscous fluid is mixed between particles, damping force can be further added by the fluid filled between the particles.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a vibration isolator according to the present invention.

FIG. 2 is a graph showing experimental results of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration isolation device 2 Support member 3 Damper container 4 Prop 5 Particle 6 Float 7 Partition plate

Claims (6)

[Claims] 1. A vibration isolator for absorbing vibration of a machine / structure, comprising: a float provided at a tip of a support member for directly supporting the machine / structure; and a particle accommodated therein; And a particle damper container that slidably supports the float, and absorbs vibration of the float by dissipating energy due to collision of the particles filling the periphery of the float. 2. The particle vibration damper according to claim 1, wherein a partition plate is provided on a horizontal surface of the float. 3. The particle vibration damper according to claim 2, wherein a float is supported by said partition plate. 4. The float according to claim 1, wherein the float is composed of upper and lower conical portions whose bottom surfaces are adhered to each other, and a difference is provided in the inclination of the upper and lower conical portions so as to provide a difference in the damping force in the vertical direction. 4. The particle vibration damper according to any one of claims 1 to 3. 5. The particle vibration damper according to claim 1, wherein a plurality of types of particles having different particle diameters are accommodated in said particle damper container. 6. The particle vibration damper according to claim 1, wherein a fluid is filled between the particles contained in the particle damper container.