JPH05239954A - Vibration control device - Google Patents

Abstract

PURPOSE:To make a device compact by storing the liquid in a U-shape tank provided with a damping means inside thereof, and supplying the air to the liquid surfaces of both sides mutually to excite the liquid forcedly. CONSTITUTION:A U-shape tank 3 having a damping plate 6 such as a mesh inside thereof is arranged in the house-top of a structural body, and the liquid 5 is stored in the U-shape tank 3. Next, air nozzles 3b, 3c are provided in air chambers 3e, 3f formed in projecting parts 3d of both sides of the tank 3, and the air nozzles 3b, 3c are connected to an air compressor 12 and atmospheric air discharge pipes 16 through switching valves 13, 14, and the air chambers 3e, 3f are under the atmospheric air in ordinary. Next, an excitation control device 10 having a vibration sensor 9 is provided to be connected to the switching valves 13, 14, and in the case where an earthquake or the like is generated, the switching valves 13, 14 are connected to the compressor 12. The switching valves 13, 14 are switched with a cycle adjusted to a cycle of the vibration, and the liquid surfaces 5a are mutually compressed to generate a large vibration control wave motion. A large vibration control effect can be thereby, exhibited with a small quantity of the liquid, and the vibration can be damped in a short time.

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) in which air chambers (3e, 3f) projecting upward are formed on both sides in the wave forming direction, and a liquid (5) is provided inside the tank. ) Is stored in the air chamber so as to form an open liquid level (5a), a damping means (6) is provided in the tank, and an air supply unit (3b, 3c) is provided in the air chamber. (1
5), each of which is provided so as to be able to supply, and air supply control means (10, 12, 1) capable of alternately supplying air to the air supply units (3b, 3c).
3, 14) are connected. 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 by the air (15) alternately supplied from the air supply unit. To work.

[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 top surface 1a of the roof or the like of the structure 1, and the vibration damping device 2 is entirely constructed as shown in FIG. Arrow A,
It has a tank 3 formed in a U shape in the B direction. Projections 3d and 3d are formed on both sides of the tank 3 in the directions of arrows A and B so as to project upward in the drawing.
Air chambers 3e and 3f are formed inside d. The liquid 5 is stored inside the tank 3 in the form of forming an open liquid surface 5a in each air chamber 3e. 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. Each air chamber 3e, 3
Air nozzles 3b and 3c are provided at f with their ends opened to the inside of each air chamber, and air pipes 11 and 11 and switching valves 13 and 14 are connected to the air nozzles 3b and 3c. The air compressor 12 is installed in the switching valves 13 and 14.
And the vibration control device 10 is connected to the vibration control device 1.
A vibration sensor 9 provided on the upper surface 1 a of the structure 1 is connected to 0.

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, if the structure 1 vibrates in the horizontal arrow A and B directions due to an earthquake or wind,
The vibration sensor 9 detects the vibration and outputs a vibration detection signal S1 to the vibration control device 10. In response to this, the vibration control device 10 switches the switching valves 13 and 14 so that the air nozzles 3b and 3c are always in communication with the air discharge pipes 16 and 16 from the air nozzles 3b and 3c. The control for switching between the 12 side and the atmosphere discharge pipe 16 side is performed alternately. Then, in each air chamber 3e, 3f, the air chamber 3e communicates with the air compressor 12 side by the switching valve 13 at a certain point in time, and the air chamber 3f switches the switching valve 1
4, the air chamber 3e communicates with the atmosphere through the atmosphere discharge pipe 16, and at the next time, the air chamber 3e communicates with the atmosphere through the atmosphere discharge pipe 16 and the air chamber 3f communicates through the atmosphere with the switching valve 14. , And is controlled to communicate with the air compressor 12 side. In this way, the vibration control device 10 switches the switching valves 13 and 14 at an appropriate cycle that matches the vibration cycle of the structure 1, and the air compressor 12 and the air nozzle 3 are switched.
b and 3c are alternately communicated. Then, the compressed air 15 is alternately supplied from the air compressor 12 to the air nozzles 3b and 3c through the switching valves 13 and 14 at a predetermined cycle, and the supplied compressed air 15 is supplied to each of the air nozzles 3.
b, 3c are alternately supplied into the air chambers 3e, 3f in the tank 3. Compressed air 1 supplied into the air chambers 3e, 3f
5 acts so as to alternately push down the liquid surface 5a of the liquid 5 in each of the air chambers 3e, 3f, whereby the liquid 5 in the tank 3 passes through the linear portion 3g of the tank 3 on which the damping plate 6 is provided. Then, the wave motion in the directions of arrows A and B is started while passing through the damping plate 6. When the compressed air 15 is supplied to the one air chamber 3e or 3f, the air in the other air chamber 3f or 3e is liquid because the other air chamber 3f or 3e is open to the atmosphere. The wave of the liquid 5 is smoothly started without acting to prevent the wave of the liquid 5. The liquid 5 stored in the tank 3 is
Waves can also be directly excited in the directions of arrows A and B by the shaking of the structure 1 itself via the. In addition, the vibration mode of the liquid 5 is such that the vibration generated in the structure 1 is canceled by the vibration control device 10 from the compressed air 1 from the air nozzles 3b and 3c.
5 is controlled by controlling the supply cycle, the structure 1
Vibrations are quickly dampened. In addition, as soon as the structure 1 starts to vibrate, the vibration sensor 9 detects the vibration,
Since the vibration control device 10 forcibly vibrates the liquid 5 via the switching valves 13 and 14 and the air nozzles 3b and 3c,
Rather than waiting for the liquid 5 in the tank 3 to start a natural wave due to the vibration of the structure 1, it is possible to generate a wave having a predetermined amplitude in a short time, and the vibration damping effect can be exhibited in a short time. It will be possible.

Further, even if the vibration of the structure 1 is small due to vibration due to a small earthquake or wind, the liquid 5 is forcibly excited by the compressed air 15, so that the vibration of the structure 1 is effectively damped. To be done. Further, when the wave of the liquid 5 becomes equal to or larger than a predetermined magnitude, the vibration control device 10 stops the vibration operation by the compressed air 15 and switches both air chambers 3e and 3f to the switching valves 13 and 14. Open to the atmosphere through. Then, the liquid 5 is waved by passing through the damping plate 6 arranged in the central portion of the tank 3 in the tank 3 in the left-right direction in the figure, and thus the wave of the liquid 5 is damped by the damping plate 5, It is possible to prevent the vibration from becoming excessive and obstructing the vibration damping operation. At this time, since the air chambers 3e, 3f are open to the atmosphere, the flow of the liquid 5 in the tank 3 is not obstructed by the air in the air chambers 3e, 3f. The magnitude of the wave of the liquid 5 is determined by the air nozzle 3b,
The amount of compressed air 15 supplied from the air compressor 3c, and thus the compressed air 1 from the air compressor 12 to each of the air nozzles 3b, 3c.
The supply pressure of 5 can be arbitrarily set by the vibration control device 10 appropriately controlling, so that at least the amount of the liquid 5 in the tank 3 can generate a large wave, and a high vibration damping effect is exhibited. You can do it.

[0011]

As described above, according to the present invention, the tank 3 having the air chambers 3e, 3f projecting upward on both sides in the wave forming direction is provided, and the liquid 5 is stored in the tank. And a damping means such as a damping plate 6 is provided in the tank, an air supply unit such as air nozzles 3b and 3c is provided in the air chamber, and compressed air 15 or the like is provided in the air chamber. Provided respectively so that air can be supplied,
A vibration control device 10 and a switching valve 1 capable of alternately supplying air to the air supply unit.
Since the air supply control means such as 3, 14 and the air compressor 12 are connected to each other, the liquid 5 in the tank 3 is forcibly vibrated by the air alternately supplied from the air supply unit to the air chamber of the tank. , It is possible to generate a large vibration even with a small amount of liquid, and to exert a large vibration damping effect. While maintaining the vibration damping effect, the amount of liquid 5 to be stored inside is reduced, and the tank is downsized. Is possible,
It is possible to greatly reduce the installation area of the vibration damping device. Even if the vibration of the structure 1 is small, the vibration of the structure 1 can be effectively damped in a short time by supplying air into the air chambers from the air supply unit and forcibly exciting the liquid. Because it can be done, it is extremely effective in the event of wind and small earthquakes.

[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 3b, 3c ... Air supply part (air nozzle) 5a ... Liquid level 6 ... Damping means (damping plate) 10 ... Air supply control means (vibration) Control device) 12 ... Air supply control means (compressor) 13, 14 ... Air supply control means (switching valve) 15 ... Compressed air

Claims (1)

[Claims] 1. A tank is provided with air chambers projecting upward on both sides in the wave forming direction, and liquid is stored in the tank in the form of forming an open liquid level in the air chamber. Damping means is provided, air supply units are respectively provided in the air chambers so as to be able to supply air to the air chambers, and air supply units capable of alternately supplying air to the air supply units. A vibration damping device configured by connecting control means.