JPH02271129A - Vibration suppressing device - Google Patents

Abstract

PURPOSE:To obviate the need of a damping member by installing each wave suppressing part whose edge part is converged, onto the both sides in the wave motion direction of a tank. CONSTITUTION:When a structure 5 is vibrated in the horizontal direction, i.e., in the direction of arrow A-B by an earthquake, wind, etc., also a tank 2 is vibration in the direction of arrow A-B, and also the liquid 3 inside is vibrated in the direction of arrow A-B, and the vibration of the structure 5 is absorbed by the wave motion energy. Further, the liquid 3 in the wave motion state vibrates in the direction of arrow A-B in a storage part 2b which is formed in straight line form, and in the wave suppressing parts 2c and 2c which are installed vertically, the wave motion direction is bent along an outer wall 2a, since the wave motion part is formed in an arcuate form, and the wave motions 3b and 3c collide each other in the wave suppressing region ARA. The wave motion of the liquid 3 is effectively attenuated in the wave suppressing part 2c by the energy loss at this time, and the vibration suppressing device 1 is provided with the effective damping performance.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application 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 tank storing a liquid such as water having a rocking frequency matching the natural frequency of the structure is installed on the top of the structure, and the vibration generated in the structure is transferred to the tank. Proposals have been made to absorb wave energy in the liquid inside the liquid.

(C) 1. Problems to be solved by the invention Damping materials such as meshes are installed in these tanks to dampen the wave motion of the liquid inside, but installing the damping material is a labor-intensive task. Moreover, maintenance to prevent corrosion and clogging was difficult.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a vibration damping device that does not require installation of a damping material.

(d) 9 Means for solving the problems, that is, the present invention has a tank (2), the tank (2)
In a vibration damping device (1) in which a liquid (3) is stored with an open liquid surface (3a) inside the tank (2), end portions ( 2d) is provided with a wave-dissipating section (2c) having a convergent shape.

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) 5 Effects Due to the above-described configuration, the present invention acts so that the waves (3b, 3c) generated in the tank (2) collide with each other in the wave-dissipating part (2c), and the wave energy is canceled out. do.

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

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

FIG. 2 is a plan view showing another embodiment of the vibration damping device according to the present invention, and FIG. 3 is a plan view showing still another embodiment of the vibration damping device according to the present invention.

As shown in FIG. 1, the vibration damping device 1 includes a tank 2 having an oval planar shape, and in the center of the tank 2, tank outer walls 2a on both left and right sides in the figure are formed parallel to each other. A storage section 2b is formed.

Wave-dissipating parts 2b, 2b each having an outer wall 2a formed in a semicircular shape are formed at the top and bottom of the storage part 2b in the drawing.・In addition, a liquid 3 such as water is stored in the tank 2 in a form that forms an open liquid surface 3a, and one or more tanks 2 are installed on the roof of a structure 5 such as a building or in a machine room. ing.

Since the vibration damping device 1 has one or more configurations, no vibration occurs in the structure 5 under normal conditions, so the liquid level 3a of the liquid 3 stored in the tank 2 is.

It is held in a horizontal state, that is, in a state parallel to the paper surface in the figure. Next, arrows A and B indicate that the structure 5 is in the horizontal direction due to earthquakes, wind, etc.
If the tank 2 vibrates in the direction of the arrows A and B, the tank 2 also vibrates in the directions of arrows A and B in synchronization with the vibration of the structure 5. Then, the liquid 5 stored in the tank 2 also starts to wave in the directions of arrows A and B, and the vibration of the structure 5 is absorbed by the wave energy. In addition, the liquid 3 in a waving state waves in the directions of arrows A and B in the linearly formed storage part 2b, but in the wave-dissipating parts 2c and 2c provided at the upper and lower positions of the tank 2 in FIG. Since the wave portion 2c is formed in an arc shape, the wave direction can be bent along the outer wall 2a, and the wave motions 3b and 3c formed on the left and right sides of the storage portion 2b in the figure are similar to the wave dissipating portion 2c. They collide head-on with each other in the wave-dissipating area ARA at the apex. At this time, the wave motion of the liquid 3 is effectively attenuated by the wave-damping section 2c due to energy loss, and the damping device 1 can be provided with effective damping properties.

In addition, although the above-mentioned Example described the case where the planar shape of the tank 2 was an ellipse shape, the planar shape of the tank 2 is arrow A which occurred in the tank 2.

Waves generated parallel to the wave direction such as the B direction are
Of course, any shape may be used as long as the directions are changed and they collide in the wave-dissipating area ARA such as 0. That is, the shape of the wave-dissipating section 2C is such that its end portion 2d
For example, as shown in Fig. 2, the tank 2 may be formed into an annular shape, and the left and right reservoirs 2b, 2b may be formed separately, and Of course, it is also possible to configure the parts 2b, 2b to be connected to each other by wave-dissipating parts 2c, 2C provided above and below in the figure.

Note that the same parts as in FIG. 1 are given the same reference numerals, and the explanation of those parts will be omitted. Furthermore, as shown in FIG. 3, it is of course possible to form the planar shape of the tank 2 into a diamond shape, and to attenuate the wave energy with wave-dampening parts 2c provided above and below in the figure. In this case, the waves in the wave-dissipating section 2c collide with each other from an oblique direction, so the wave energy is equal to that in the case where the waves 3b and 3c collide head-on with each other as shown in FIGS. 1 and 2. It is not attenuated as much.

(g) 1.Detailed Description of the Invention According to the present invention, in the vibration damping device 1 which has a tank 2 and in which the liquid 3 is injected in a form having an open liquid surface 3a inside the tank 2, Arrows A and B of the tank 2
Waves 3b generated within the tank 2 are formed by providing wave-dissipating portions 2c with converging end portions 2d on both sides of the wave direction.

30 and the like collide with each other in the wave-dissipating portion 2c, and the wave energy thereof is effectively absorbed, thereby also absorbing the vibration of the structure 5. Further, since there is no need to provide a damping material such as a mesh inside the tank 2, assembly and maintenance of the device 1 is easy, and the device 1 is highly reliable against changes over time.

[Brief explanation of drawings]

FIG. 1 is a plan view showing one embodiment of a vibration damping device according to the present invention. FIG. 2 is a plan view showing another embodiment of the vibration damping device according to the present invention. FIG. 3 is a plan view showing still another embodiment of the vibration damping device according to the present invention. 1... Vibration damping device 2... Tank 2c... Wave dissipating section 2d... End portion 3... Liquid 3a... ...Liquid level applicant Mitsui Construction Co., Ltd. agent Patent attorney Phase 1) Shinji (1 idiot)

Claims (1)

[Claims] A vibration damping device that has a tank and stores liquid with an open liquid surface inside the tank, and is configured by providing wave-dissipating parts with converging ends on both sides of the tank in the wave direction. Vibration damping device.