JPS62292943A - Dynamic vibration reducer - Google Patents

Abstract

PURPOSE:To facilitate simplification, adjustment and maintenance of a structure by inserting a porous partitioning member soaked in a tank and giving resistance to motion of the inner fluid in a dynamic vibration reducer in which the inner fluid having free surface is stored in the tank and anti rolling is made by sloshing of the inner fluid. CONSTITUTION:A tank 1a is designed to attenuate its motion with viscosity resistance of inner fluid by a mesh type baffle 2a against vibration on the x-z plane and against that on the y-z plane. Thus, by inserting a porous partitioning member, structure simplification, easy adjustment and maintenance can be realized. Therefore, attenuation value and specific vibration number can easily be adjusted and aged deterioration is less as there is no vibration part. And the direction to which the reducer works can be set variously to 1 direction, 2 directions or non direction by changing the shape of the vessel. Further, specific vibration number can set to a desired number by the shape of the tank and its liquid amount.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to a dynamic vibration absorber used for allocation.

[Conventional technology]

In conventional dynamic vibration absorbers, vibration damping is done by using an oil tambour or viscous damper, the natural frequency is set using a spring or pendulum, and the mass is as follows because the groove bottom is made of iron etc. There are problems like this.

(1) When using a spring, the natural frequency cannot be adjusted because the spring constant is constant, and with a pendulum type, it is difficult to adjust the natural frequency because the length of the arm with the mass must be changed.

(2) Dampers change over time due to deterioration of oil, wear of sliding parts, etc., and require maintenance.

(3) Mechanisms such as sliding parts, springs, dampers, etc. are complicated.

[Problem that the invention seeks to solve]

The present invention was proposed in view of the above circumstances, and an object of the present invention is to provide a dynamic vibration absorber with a simple structure and easy adjustment and maintenance.

[Means for solving problems]

To this end, the present invention provides a dynamic vibration absorber in which an internal fluid having a free surface is stored in a tank, and vibration is reduced by sloshing of the internal fluid as the tank oscillates.
The present invention is characterized in that a porous partition member is inserted into the tongue and provides resistance to the movement of the internal fluid.

[For production]

With such a configuration, it is possible to obtain a dynamic vibration absorber that has a simple structure and is easy to adjust and maintain.

〔Example〕

To explain the present invention with reference to the drawings, FIG. 1 is a perspective view showing a first embodiment of the present invention, and FIG. 2 is a plan view of FIG.
-A, B-8 vertical cross section; FIG. 3 is a perspective view showing a modification of FIG. 1; FIG. 4 is a perspective view showing a second embodiment of the present invention;
1, FIG. 6 is a perspective view showing a third embodiment of the present invention, and FIG. 7 is a model diagram of FIG. 6.

1. The first embodiment shown in FIGS. 1 to 3 shows a box-type anti-sway tank, and the tank 1a has a plurality of mesh baffles 2 orthogonal to each other.
It is partitioned into multiple small rooms by a.

Such a tank la can also withstand vibrations on the xz plane.
Furthermore, the movement of vibrations on the yz plane is attenuated by the mesh baffle plate 2a together with the viscous resistance of the internal fluid.

Next, the second embodiment shown in FIGS. 4 and 5 shows a cylindrical tank with a vibration reduction tank, in which a cylindrical tank 1b is partitioned into two internal and external chambers by a coaxial cylindrical mesh baffle plate 2b. 2b is concentrically supported on the tank 1b by stays 4 extending on two orthogonal diameters thereof.

In the tank 1b as well, the movement of the internal fluid is attenuated by the viscous resistance of the cylindrical mesh baffle plate 2b and the internal fluid 3b against vibrations on the xz plane and the yz plane, as in the first embodiment.

Furthermore, the third embodiment shown in FIGS. 6 and 7 shows a U-shaped anti-sway tank, and in this embodiment, a plurality of porous baffles 2C are inserted in the horizontal communication part as damping resistance plates, and the vertical surface The porous partition plate 2c applies a damping force to the movement of the internal fluid, and at that time, the specific moving number of the internal fluid (1, .
4゜(1) Since the structure is simple, the damping value and natural frequency can be easily adjusted.

(2) Since there are no sliding parts, there is very little deterioration over time.

(3) The dynamic vibration absorber moves in one direction 20,000 times.

Various settings can be made by changing the non-direction and the shape of the container.

(4) Natural frequency (can be set to a desired size depending on the shape of the tank and its liquid volume.

〔Effect of the invention〕

A dynamic vibration absorber that stores an internal fluid having a free surface and reduces the vibration by getting caught in the sloshing of the internal fluid as the tank oscillates. By inserting a porous partition member that is immersed in the tank and provides resistance to the movement of the internal fluid, a dynamic vibration absorber with a simple structure and easy adjustment and maintenance is obtained, so the present invention is extremely useful industrially. It is something.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a plan view and A-A, IJ-B longitudinal section of FIG. 1, and FIG. 3 is a perspective view showing a modification of FIG. 1. 4 is a perspective view showing a second embodiment of the present invention, FIG. 5 is a plan view and a vertical sectional view of FIG. 4, and FIG. FIG. 7 is a model diagram of FIG. 6. 1a...Box-shaped tank, 1b...Cylindrical tank, IC
...U-shaped tank, 2a...mesh baffle plate, 2b...
・Cylindrical mesh baffle plate, 2C... Porous baffle plate, 3a, 3b
, 3c...internal fluid, 4b... stay. Figure 1 F Figure 2 Figure 4 Figure 5

Claims (1)

[Scope of Claims] A dynamic vibration absorber in which an internal fluid having a free surface is stored in a tank, and vibration is reduced by sloshing of the internal fluid as the tank oscillates. A dynamic vibration absorber characterized by inserting a porous partition member that provides resistance to the movement of internal fluid.