JP3068302B2 - Pendulum 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 a pendulum-type damper suitable for mounting on a narrow structure portion of a bridge, a tower or the like which cannot be accommodated by a conventional damping device (TMD). It relates to a vibration device.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional mass damper type vibration damping device (TMD). In the figure, 4 is a spring, 5 is an oil damper, 6 is a weight, 9 is a frame, and both the spring 4 and the oil damper 5 are mounted horizontally.

[0003]

The above-mentioned prior art has the following problems. When the natural frequency is high and the place where the vibration damping device is mounted is small, the shape of the vibration damping device must be small. However, in the type shown in FIG. 5, since the spring and the oil damper are arranged horizontally, the size of the device becomes long, and the device cannot be installed in a narrow place.

SUMMARY OF THE INVENTION An object of the present invention is to provide a small pendulum type vibration damping device which can be installed even in a narrow space, and particularly has a small lateral dimension.

[0005]

The vibration damping device is reduced in size by disposing the spring vertically so that the spring weight becomes a part of the mass.

[0006]

The device can be made compact by mounting the spring vertically. Since the weight is set in consideration of the spring's own weight, the weight becomes small. Since the suspension type is used, the initial stability of the vibration damping device is high.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a pendulum type vibration damping device (entire),
2 is a suspended arm, 3 is a horizontal beam fixed to the lower end of the arm 2,
Reference numeral 4 denotes two springs, 5 denotes an oil damper, 6 denotes a weight, 7 denotes a thrust bearing, 8 denotes a spacer, 9 denotes a frame, 10 denotes a bearing of the arm 2, and 11 denotes an upper beam of the frame 9.

A spring 4 is vertically mounted between the horizontal beam 3 and the upper beam 11, and oil dampers 5 (four in this embodiment) in a direction parallel to the horizontal beam 3 are mounted on the upper end of the arm 2. Therefore, when the vibration damping device 1 fixed to the structure vibrates left and right, the arm 2 suspended from the bearing 10 swings the weight 6 together with the weight 6, and the left and right springs 4 move through the horizontal beam 3. The oil damper 5 on the upper beam 11 expands and contracts up and down, and the oil damper 5 expands and contracts in the horizontal direction, so that the vibration generated in the structure is attenuated.

Next, the operation of the vertically mounted spring 4 will be described. The equation of motion of the model shown in FIG. 5 is given by the following equation.

[0010]

(Equation 1)

From these equations, the frequency is adjusted to a predetermined frequency. In addition, as shown in FIG. 6, a deflection angle occurs at the point of the inverted T-shaped frame due to the effect of the reaction force of the spring 4.
It is necessary to consider the rigidity of the beam and the like so that the deflection angle does not affect the displacement of the spring 4. Also, the bearing 10
Since a thrust force is generated in the portion, the thrust bearing 7 and the spacer 8 are attached to eliminate axial movement due to the thrust force.

[0012]

According to the present invention, structures such as skyscrapers, long bridges and towers that vibrate under the influence of wind are increasing. Many current vibration damping devices are relatively large and cannot always be mounted on a structure requiring vibration damping.

According to the pendulum type vibration damping device of the present invention, horizontal beams protruding on both sides thereof are fixed to the lower end of an arm on which a weight is suspended from the upper portion of the frame of the vibration damping device. Are connected to each other by a vertical spring, and the arm is extended above the fulcrum of the upper part of the frame, and the space between the upper extended end and the upper part of the frame is horizontal and parallel to the direction of the horizontal beam. The following effects are obtained by connecting with an oil damper.

[0014] Even for a relatively large frequency, it is possible to design a compact size, and it is possible to mount it even in a narrow portion of the main tower.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is an enlarged view of a bearing part of FIG. 2;

FIG. 5 is a model diagram of a vertically mounted spring.

FIG. 6 is a schematic diagram showing left and right spring reaction forces and deflection of a horizontal beam.

FIG. D. It is a front view of M vibration control device.

[Explanation of symbols]

 2 arm 3 horizontal beam 4 spring 5 oil damper 6 weight 9 frame 10 bearing

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16F 15/02-15/08 E04H 9/02 E01D 1/00

Claims (1)

(57) [Claims] 1. A horizontal beam protruding on both sides of a lower end of an arm having a weight suspended from an upper portion of a frame of a vibration damping device,
The both sides of the horizontal beam and the upper part of the frame are connected by a vertical spring, respectively, the arm is extended above the fulcrum of the upper part of the frame, and the upper extending end and the upper part of the frame are horizontally extended. A pendulum type vibration damper, wherein the pendulum type vibration damper is connected by an oil damper parallel to a direction of the horizontal beam.