JPH0598844A - Damping device - Google Patents

Abstract

PURPOSE:To damp the extent of vibration in a structure as well as to aim at the promotion of reduction in a tank and a device area by installing this tank free of movement in a wave forming direction with a hydraulic actuator, driving this actuator at time of earthquake and exciting a liquid forcibly. CONSTITUTION:A liquid 5 is stored in a tank 3, and when a structure 1 is horizontally vibrated in both arrow A, B directions by an earthquake and a strong wind or the like, a vibration sensor 9 detects it, outputting a signal S1 to an excitation controller 10. Next, this controller 10 drives a hydraulic actuator 7, and a rod 7a reciprocates in these arrow A, B directions in accord with a vibro-period of the structure 1. In succession, the tank 3 is also driven on a top face 1a of the structure together with the liquid 5 stored inside, and thereby the liquid 5 starts its wave motion in these arrow A, B directions. As a wave mode of the liquid 5, the excitation controller 10 controls it in the shape of neutralizing the vibration produced in the structure 1. In this connection, magnitude of the wave motion of the liquid 5 is optionally adjusted by properly setting a moving stroke or the like of the actuator 7, thus even if the liquid 5 is a little in quantity, a large wave motion is formed for damping.

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 suitable for attenuating vibration generated in a structure such as a building due to an earthquake or wind.

[0002]

2. Description of the Related Art Recently, a vibration damping device consisting of a tank storing a liquid such as water having a rocking frequency matching the natural frequency of the structure has been installed on the upper part of the structure, and vibration generated in the structure has been installed. It has been proposed to absorb the wave energy of the liquid in the tank.

[0003]

However, in order to generate sufficient wave energy to absorb the vibration of the structure by such a method, the amount of liquid to be stored inside the tank is large, and the tank is inevitably inevitable. Therefore, it is inevitable that the vibration damping device becomes large. However, since this type of vibration damping device is often installed in a place with a limited space, such as a rooftop of a structure, a large size of the vibration damping device is an obstacle to installation of other equipment such as an elevator. Inconvenience occurs.

In view of the above circumstances, it is an object of the present invention to provide a vibration damping device which can exert a large vibration damping effect even with a small amount of liquid and requires a small installation space.

[0005]

That is, the present invention has a tank (3) movably supported in the horizontal direction on an upper portion (1a) of a structure (1), and the tank has an opening liquid inside. An actuator for storing the liquid (5) in the form of a surface (5a), providing damping means (6) in the liquid in the tank, and driving the tank in the horizontal direction between the tank and a structure. (7) is provided and configured. It should be noted that the numbers in parentheses indicate the corresponding elements in the drawings for the sake of convenience, and thus the present description is not limited to the description in the drawings. The same applies to the section "(e). Action" below.

[0006]

With the above structure, the present invention provides the tank (3).
The liquid (5) therein acts so as to be forcibly excited together with the tank by the actuator.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of a vibration damping device according to the present invention.

As shown in FIG. 1, a vibration damping device 2 according to the present invention is arranged on the upper surface 1a of the roof of the structure 1, and the vibration damping device 2 is a tank having a rectangular planar shape. Have three. The longitudinal direction of the tank 3 is set to the left-right direction in the drawing, and the tank 3 passes through wheels 3h and 3h provided on the bottom surface of the tank 3 on the upper surface 1a of the structure, that is, the arrow A It is provided so as to be movable in the B direction. The liquid 5 is open inside the tank 3 and the liquid level 5a
Are stored in the form of. At the center of the tank 3, a damping plate 6 made of a porous material such as a mesh is provided so as to be submerged in the liquid 5. A hydraulic actuator 7 is provided between the right side surface of the tank 3 in the drawing and the structure 1. Further, a vibration sensor 9 is provided on the upper surface 1a of the structure 1, and the vibration sensor 9 is connected to the vibration control device 10 to which the hydraulic actuator 7 described above is connected.

Since the vibration damping device 2 has the above-described structure, the structure 1 does not vibrate in a normal state.
The liquid surface 5a of the liquid 5 stored in the tank 3 is held in a horizontal state as shown in FIG. Next, assuming that the structure 1 vibrates in the horizontal arrows A and B directions due to an earthquake or wind, the vibration sensor 9 detects the vibration and the vibration detection signal S1 is detected.
Is output to the vibration control device 10. In response to this, the vibration control device 10 drives the hydraulic actuator 7 to move the rod 7
A is reciprocally driven in a direction adapted to the vibration cycle of the structure 1 in the directions of arrows A and B. Then, the tank 3 is also driven in the directions of arrows A and B on the structure upper surface 1a via the wheels 3a together with the liquid 5 stored therein, so that the liquid 5 stored in the tank 3 is By being reciprocally driven, as shown by the solid line in the figure, the tank longitudinal direction, that is, the arrow A,
The vibration starts in the B direction. Since the vibration mode of the liquid 5 is controlled by the vibration control device 10 so as to cancel the vibration generated in the structure 1, the vibration of the structure 1 is quickly attenuated. As soon as the structure 1 starts to vibrate, the vibration sensor 9 detects the vibration and the vibration control device 10 forcibly vibrates the liquid 5 together with the tank 3 via the hydraulic actuator 7. It becomes possible to generate a wave having a predetermined amplitude in a short time rather than waiting for the liquid 5 in the tank 3 to start a natural wave due to the vibration of 1. Thus, it becomes possible to exhibit the vibration damping effect in a short time. .

Further, even when the vibration of the structure 1 is small due to the vibration due to a small earthquake or wind, the liquid 6 is forcibly excited by the hydraulic actuator 7, so that the vibration of the structure 1 is effectively damped. To be done. Further, when the wave of the liquid 5 exceeds a predetermined magnitude, the vibration control device 10 stops the vibration operation via the actuator 7. Then, tank 3
Stops the movement in the directions of arrows A and B, and only the liquid 5 flows in the tank 3 in the directions of arrows A and B through the damping plate 6, and the wave of the liquid 5 is damped by the damping plate 6, It is possible to prevent the vibration from becoming excessive and obstructing the vibration damping operation. The magnitude of the wave motion of the liquid 5 can be arbitrarily adjusted by appropriately setting the moving stroke of the actuator 7 or the like.
When the amount is at least, a large wave can be generated, and a high vibration damping effect can be exhibited.

[0011]

As described above, according to the present invention, there is provided the tank 3 movably supported in the horizontal direction above the upper surface 1a of the structure 1 and the inside of the tank has the open liquid level 5a. To store the liquid 5 in the form of a liquid, to provide a damping means such as a damping plate 6 in the liquid in the tank, and to move the tank in the horizontal direction between the tank and a structure, such as a hydraulic actuator 7. Since the actuator 5 is provided and configured, the liquid 5 in the tank 3 is forcibly excited together with the tank by the actuator, so that it is possible to generate a large wave even with a small amount of liquid, while maintaining the damping effect. By reducing the amount of the liquid 5 to be stored inside, it is possible to reduce the size of the tank, and it is possible to significantly reduce the installation area of the vibration damping device. Also, the structure 1
Even if the vibration of the tank is small, the structure 1 can be effectively
The vibration of can be attenuated in a short time, so it is extremely effective even in the event of wind or a small earthquake.

[Brief description of drawings]

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

[Explanation of symbols]

 1 ... Structure 2 ... Damping device 3 ... Tank 5a ... Liquid level 6 ... Damping means (damping plate) 7 ... Actuator (hydraulic actuator)

Claims (1)

[Claims] 1. A tank, which is movably supported in a horizontal direction in an upper portion of a structure, stores a liquid in the tank so as to form an open liquid level therein, and attenuates the liquid in the tank. A vibration damping device comprising means and an actuator for moving and driving the tank in the horizontal direction between the tank and a structure.