JPH02275141A - Damping device - Google Patents

Abstract

PURPOSE:To make it possible to absorb the oscillation of a structure by means of the rocking motion of small spheres in a tank or the rocking motion of the small spheres and fluid in the tank by storing a number of small spheres in the tank, or storing fluid together with the small spheres in such a way as to form the fluid surface above the small spheres. CONSTITUTION:When a structure 1 oscillates horizontally to the directions as shown by arrow heads A and B by earthquakes, wind and the like, a tank 3 also oscillates to its longer directions A and B in such a way as to be synchronized with oscillation. This permits small spheres 5 stored inside to absorb the oscillation of the structure 1 as a whole by means of kinetic energy accompanied with oscillation in a form of waves while they are rolled over to the directions A and B in such a way as to be synchronized with the oscillation of the tank 3. In the second place, a device is so constituted that the small spheres 5 are stored up to a specified depth H1, and fluid 7 such as water and the like is stored up to the position H2 of a depth deeper than H1 in such a way as to form an open fluid surface 7a at the upper section. In this case, when the oscillation of the structure 1 in the directions A and B is small in magnitude, the oscillation is absorbed by the rocking motion of the fluid 7 to the directions A and B. When the oscillation is intensified to a great extent, the oscillation is absorbed by the rocking motion of both of the small spheres 5 and the fluid 7 with the rocking motion of the small spheres 5 overlapped.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a vibration damping device suitable for use in damping vibrations generated in structures such as buildings due to earthquakes, wind, etc.

(b), Prior Art Recently, a vibration damping device consisting of a tank containing a liquid such as water having a rocking frequency matching the natural frequency of the structure has been installed on the top of the structure. A proposal has been made to absorb the generated vibrations by the wave energy of the liquid in the tank.

(C) 0 Problems to be Solved by the Invention However, it is desirable for this type of vibration damping device to be able to be selected from various forms depending on the installation location and installation situation.
The development of various types of vibration damping devices is desired.

In view of the above-mentioned circumstances, the present invention aims to provide a vibration damping device using a large number of small spheres.

(d) Means for solving the zero problem, that is, the present invention has a tank (3), and the tank (3)
It is constructed by storing a large number of small spheres (5) inside.

It also has a tank (3) in which a large number of small spheres (5) are stored up to a predetermined depth, and a liquid (7) is formed at the top to form a liquid level (7a). It is made up of storage.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings.

The same applies to the column "r(e), action" below.

(e) 4 Effects With the above-described configuration, the present invention operates so that vibrations of the structure (1) are absorbed by the small spheres (5) swinging within the tank (3).

Further, the present invention operates so that the vibrations of the structure (1) are absorbed by the small spheres (5) and the liquid (7) rocking within the tank (3) depending on their magnitude.

(f), Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a front view showing one embodiment of a vibration damping device according to the present invention, and FIG. 2 is a front view showing another embodiment of the present invention.

As shown in FIG. 1, a vibration damping device 2 according to the present invention is disposed on an upper surface 1a of a structure 1, such as a rooftop.As shown in FIG. Tank 3 formed in a rectangular shape with longitudinal directions in directions A and B
have. Inside the tank 3, a large number of small spheres 5 such as marbles made of a material having a higher specific gravity than water are stored.

Since the vibration damping device 2 has one or more configurations, no vibration occurs in the structure 1 under normal conditions, so the small spheres 5 stored in the tank 3 are If the surface 6 of the assembly is held in a horizontal state and the structure 1 vibrates in the horizontal directions of arrows A and B due to an earthquake or wind, the tank 3 also vibrates in the longitudinal direction in synchronization with the vibration. It vibrates in the directions of arrows A and B. Then, the small spheres 5 stored inside roll in the directions of arrows A and B in synchronization with the vibrations of the tank 3, and the whole 5 starts to oscillate like a wave, and the movement accompanying the oscillation. The energy absorbs vibrations of the structure 1.

The kinetic energy of the small spheres 5 is dissipated by the friction acting between the spheres, thereby damping the motion of the small spheres 5,
As a result, vibrations of the structure 1 are also damped.

In the above-described embodiment, only the small spheres 5 are stored in the tank 3, but in addition to the small spheres 5, as shown in FIG. It is also possible to store the small spheres 5 up to a point H2, which is deeper than H1, and store a liquid 7 such as water with an open liquid level 7a at the top. In this case, while the vibrations of the structure 1 in the directions of arrows A and B are small, the liquid 7 absorbs the vibrations by swinging in the directions of arrows A and B, and the vibrations of the structure 1 in the directions of arrows A and B are large. If it becomes, the amount of liquid 7 until then.

In addition to the rocking motion, the rocking motion of the small sphere 5 in the directions of arrows A and B is added, and the vibrations are absorbed by the rocking motion of both the small ball 5 and the liquid 7. At this time, the wave motion of the liquid 7 moves between the small spheres 5.
is attenuated by the passage of the

(g) As described in detail, according to the present invention, the tank 3 is provided, and a large number of small spheres 5 are stored inside the tank 3, so that the vibration of the structure 1 is caused by the small spheres. 5 is absorbed by swinging within the tank 3, making it possible to provide a new type of vibration damping device 1.

In addition, the structure has a tank 3, in which a large number of small spheres 5 are stored up to a predetermined depth, and a liquid 7 is stored in a form that forms a liquid level 7a at the top, so that the structure 1 The vibrations are absorbed by the small spheres 5 and the liquid 7 oscillating within the tank 3 according to their magnitude, making it possible to provide a new type of vibration damping device 1.

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[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of a vibration damping device according to the present invention, and FIG. 2 is a front view showing another embodiment of the present invention. 2... Vibration damping device...Tank/Small sphere...Liquid a...Liquid level

Claims (2)

[Claims] (1) A vibration damping device comprising a tank and a large number of small spheres stored inside the tank. (2) A vibration damping device comprising a tank, in which a large number of small spheres are stored up to a predetermined depth, and a liquid is stored in the form of a liquid level at the top.