JP2909987B2 - Fluid damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active fluid type vibration damping device, and more particularly to a vibration damping device for a structure in which a large mass damping effect is obtained with a small mass ratio (fluid weight / structure weight). is there.

[0002]

2. Description of the Related Art In an active fluid type vibration damping device, as shown in, for example, Japanese Patent Application Laid-Open No. 63-181868, a storage tank is provided at a predetermined position such as a roof of a high-rise building so as to be reciprocally movable. When the structure is stationary, the tank is located at the center and keeps the stationary state, and when the building vibrates horizontally due to an earthquake or strong wind, etc. The tank reciprocates in the horizontal direction with the same phase in synchronism with the liquid, and the liquid inside oscillates with a phase difference of 90 ° from this movement, thereby giving an inertia force in the direction opposite to the shaking of the building, Generates vibration damping force and contributes to building damping.

[0003]

However, the tank constituting the conventional vibration damping device is conventionally merely provided so as to be movable in the lateral direction at the same vibration frequency as the natural frequency of the building. The movement of the center of gravity of the fluid in the tank is slow, the inertia force is small, and the vibration damping effect is small. Conversely, in order to provide a large damping force, a large capacity tank and fluid are required, and the space occupied by the entire apparatus in the building is large.

The present invention has been made to solve the above problems, and an object of the present invention is to forcibly tilt a tank in a swing direction at an optimal timing according to a swing of a structure.
It is an object of the present invention to provide a vibration damping device for a structure in which even a small tank can quickly move the center of gravity of a liquid to generate a large inertial force.

[0005]

According to a first aspect of the present invention, a U-tube-shaped storage tank is provided at a predetermined position of a structure, and a liquid tank is provided inside the tank. In the vibration damping device, the tank is swingably held via a fulcrum, and a driving mechanism for forcibly swinging the tank is provided between the structure and the tank. And a damper member for stably swinging the tank, and further, a sensor for detecting vibration of the structure, and instructing a drive timing of the drive mechanism according to a detection force of the sensor. Control means. According to a second invention , a storage tank is provided at a predetermined position of a structure.
Vibration damping device provided with a tank and storing liquid inside the tank
In the above, the tanta is placed through a fulcrum located immediately below the tantalum.
To hold it swingably, and to
Between the tank and the tank
Drive mechanism and a damper for stably oscillating the tank.
And a vibration member of the structure.
A sensor to be detected, and
And control means for instructing the drive timing of the drive mechanism.
It is a thing. According to a third aspect of the present invention, in a vibration damping device in which a storage tank is provided at a predetermined position of a structure, and a liquid is stored inside the tank, a fulcrum located vertically above the center of gravity of the tank is provided. A driving mechanism provided between the structure and the tank for forcibly swinging the tank, a sensor for detecting vibration of the structure, and a sensor for detecting the vibration of the structure. Control means for instructing the drive timing of the drive mechanism in accordance with the detection force.

[0006]

According to the above configuration, when the structure is in a stationary state, the swing fulcrum of the storage tank and the center of gravity of the fluid coincide with each other and are stationary. When the structure vibrates from this state, the sensor detects the intensity and direction of the vibration, and the control unit calculates the optimal drive timing based on the data, and instructs the drive mechanism of the timing. When the drive mechanism forcibly tilts the storage tank, the liquid rapidly swings and displaces in the tilt direction, changes the position of the center of gravity, accelerates the flow of fluid, and transmits greater inertial force to the structure through the tank wall .

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. In the figure, U is placed on the rooftop floor 10 of a high-rise building.
A storage tank 14 having a tubular shape is arranged, and stores water 16 for control therein.

The floor 10 is located at the center of the lower surface of the tank 14.
A fulcrum portion 18 fixed above is disposed, holds the tank 14 in a seesaw manner so as to be swingable, and
A pair of damper members 20 made of a compression coil spring or the like are interposed between the lower side of the bottom 4 and the floor 10.

The damper member 20 supports the tank 14 horizontally while the tank 14 is stationary as indicated by the imaginary line in the figure, and the corners of the bottom surface of the tank 14 collide with the floor 10 during swinging as indicated by the solid line in the figure. It also functions as a cushion to prevent the user from doing so.

A drive motor 24 is disposed on the floor 10 on one side of the tank 14. The output shaft 26 of the drive motor 24 appears and disappears with the drive of the motor body.
The output shaft 26 is connected to one side of the tank 14 via a link 28,
Is forcibly operated to swing left and right around the fulcrum 18.

At a suitable position on the floor 10, a vibration detection sensor 30 for detecting the vibration intensity and direction of the building is disposed. The sensor 30 is connected to a control unit 32 disposed at an appropriate position near the tank 14.

The control unit 32 stores data such as the volume of the tank 14, the total weight of the water 16, the total mass, the rotational moment, and the like, receives the detection output of the sensor 30, and receives the current vibration intensity. The direction and timing of the optimum inclination of the tank 14 are immediately calculated based on the data based on the data and the direction, and the drive direction and timing are commanded to the drive motor 24.

Therefore, when the building is in a stationary state, the drive motor 24 stops while the tank 14 is maintained at the neutral position, and the tank 14 is positioned horizontally with the fulcrum 18 as a fulcrum. And the center of gravity G0 of the water are in agreement.

When the vibration is transmitted to the building from this state, the sensor 30 detects the vibration and outputs the intensity and direction of the vibration to the control unit 32.

The control unit 32 immediately calculates the drive direction and drive timing for the drive motor 24 based on the obtained data, and based on the calculation result, the drive motor 24 is driven according to the timing, and the tank 14 is moved to either the left or right. Tilt to. As a result, the water 16 moves while being accelerated in the tilt direction, and the swing displacement ± x acts on the wall surface of the tank 14 as a larger inertia force F and is transmitted to the building.

FIG. 2 shows an experimental example of the time history of the amplitude when a vibration is given to a certain structure model.
When an input wave of a specific amplitude is given to the structure model as shown in (a), and when control for vibration suppression is not performed, the structure model is sequentially changed as shown in (b). Vibration continues while damping.

On the other hand, when the tank is tilted only by the movement of the center of gravity of the water, that is, when the tilt control by the drive motor is not performed, the amplitude sharply attenuates as shown in FIG. For a long time, a small vibration lasts.

In addition, when the driving motor is driven at an optimum timing, even if the same model is used,
As shown in (d), the amplitude abruptly attenuates, and the vibration disappears in a short time.

FIG. 3 shows a second embodiment of the present invention. The same portions as those in the above embodiment are denoted by the same reference numerals, and only different points will be described using different reference numerals.

In the figure, a support bar 34 is stretched between the upright portions 14a on both sides of a U-shaped storage tank 14 in which water 16 is stored. A central portion of the support bar 34 supports a fulcrum pin 36. The tank 14 is connected to the upper end of a support bracket 38 erected on the floor surface 10 via the floor, and the tank 14 is held in a balanced manner.

The fulcrum pin 36 is connected to the drive motor 24 via a crank or the like, and the tank 14 is forcibly swung left and right about the fulcrum pin 36 by driving the drive motor. The drive motor 24 also has a drive direction based on a command from the control unit 32 in accordance with the detection output of the sensor 30,
It is driven at a timing, and its operation is the same as in the first embodiment.

Further, in this embodiment, since the tank 14 is supported in a balanced manner in a slimy manner, a damper member for maintaining horizontality is not required.

[0024]

[0025]

As described in detail in the above embodiments, in the fluid type vibration damping device according to the present invention, when the structure vibrates, the intensity and direction of the vibration are detected by the sensor, and the control unit is controlled. Then, the optimum drive timing is calculated based on this data, and the timing is instructed to the drive mechanism.
And when the drive mechanism forcibly tilts the storage tank,
The fluid rapidly swings and displaces in the direction of its inclination, changes the position of the center of gravity, accelerates the fluid flow, and transmits a greater inertial force to the structure through the tank wall. A force is obtained, and the vibration of the structure can be attenuated at an early stage. In addition, there is an advantage that the size can be reduced and the cost can be reduced and the occupied space can be reduced. According to the first aspect of the present invention, since the tank is swung by one drive mechanism, a plurality of drive mechanisms are provided at both ends of the tank, and the drive mechanisms are driven by the same distance in directions opposite to each other. It is not necessary to perform such complicated control, and stable operation can be obtained by the presence of the damper member. Moreover, in the present invention,
Since the retaining tank has a U-tube shape, the liquid quickly moves
Does not disturb the liquid surface even when moving to
Absent. According to the invention described in claim 2, the tank is
The fulcrum that is swingably supported is located directly below the tank.
As a result, the entire device can be made more compact,
Good responsiveness of the crop. Further, according to the third aspect of the present invention,
Then, since the fulcrum is located vertically above the center of gravity of the tank, a stable state can be maintained without providing a damper member or the like.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a vibration damping device according to a first embodiment of the present invention.

FIGS. 2A to 2D are graphs showing experimental examples of time histories of amplitude when a certain structural model is vibrated.

FIG. 3 is an explanatory view of a vibration damping device according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 floor 14 storage tank 16 water (liquid) 18 fulcrum 24 drive motor (drive mechanism) 30 vibration detection sensor 32 control unit (control means) 36 fulcrum pin (fulcrum)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04H 9/02-9/02 351 E04H 7/00-7/04

Claims (3)

(57) [Claims] In a vibration damping device having a U-shaped storage tank provided at a predetermined position of a structure and storing a liquid inside the tank, the tank is swingably held via a fulcrum. Along with the structure and the tank, one drive mechanism for forcibly swinging the tank and a damper member for stably swinging the tank are provided, A fluid type vibration damping device comprising: a sensor for detecting vibration of the structure; and control means for instructing a drive timing of the drive mechanism in accordance with a detection force of the sensor. 2. A storage tank is provided at a predetermined position on a structure.
And a damper that stores liquid inside the tank.
And the tank can be swung through a fulcrum located immediately below the tank.
Between the structure and the tank
One drive mechanism for forcibly operating the tank
And a damper member for stably swinging the tank
And a sensor for detecting vibration of the structure.
Sensor and the drive mechanism according to the detection force of the sensor.
Control means for instructing the drive timing.
Fluid type vibration damping device. 3. A vibration damping device in which a storage tank is provided at a predetermined position of a structure and a liquid is stored inside the tank, wherein the tank is swung via a fulcrum located vertically above the center of gravity of the tank. A driving mechanism provided between the structure and the tank for forcibly swinging the tank, a sensor for detecting vibration of the structure, and a detection force of the sensor. And a control means for instructing the drive timing of the drive mechanism in response.