JP2674459B2 - Pendulum type vibration control 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 vibration damping device which utilizes a pendulum to suppress the shaking of a structure during strong winds or earthquakes.

[0002]

2. Description of the Related Art A vibration control device utilizing vibration of a pendulum provides a pendulum with a period that is similar to the natural period of a structure, so that the pendulum vibrates when the structure vibrates and energy is generated. It absorbs and suppresses the shaking of the structure, but since it is necessary to increase the pendulum length in order to lengthen the period, a single pendulum may have a height of several layers, so installation is not possible. Limited.

In response to this installation obstacle, a vibrating body having a specific curvature is placed on a roller and vibrated to function as a pendulum having a radius of curvature as a pendulum length, or a frame is multiply provided on the outer circumference of the pendulum. A device that secures the pendulum length in the lateral direction by arranging and suspending a pendant that suspends the pendulum between the frames to suppress the height (for example, JP
(See Japanese Patent Laid-Open No. 2-292545) , the former requires consideration of friction with the roller, and the latter requires more members for suspending the pendulum and requires more detail adjustment, which complicates assembly. In addition, problems such as occurrence of noise are pointed out.

The present invention has been made by paying attention to the problem of installation of the pendulum type vibration control device, and is intended to propose a vibration control device having a simple structure and suppressing the height.

[0005]

SUMMARY OF THE INVENTION In the present invention, a pendulum having a simple structure by utilizing link devices which are rotatably connected to each other and are assembled in a gate shape is large with respect to the actual height of the device. Secure the length and prolong the pendulum cycle.

[0006] portal linking device consists an arm for parallel rotatably supported around a horizontal axis against the structure, the connecting link being rotatably connected around a horizontal axis against the arms, the pendulum The weight is from the middle of the connecting link
It is connected to the lower end of the hanging hanging rods. The upper end of the suspension bar is fixed to the connecting link and vibrates while keeping a constant angle with the connecting link.

[0007] The weight vibrates around an imaginary fulcrum on the extension line of the connection point of the suspension bar with the reciprocating rotational movement of the arm around the horizontal axis when the structure vibrates, so that the weight is substantially By having a pendulum length that is greater than the length of the suspension rod, a longer period of the weight is achieved by a device that is lower in height than that required for a single pendulum.

Since the weight can be lengthened by three links, the structure of the vibration control device is simplified, high assembly precision and fine adjustment are not required, and the connection of each component is a pin. This avoids loss of force between members and generation of noise.

The effect of suppressing the vibration of the structure by the vibration control device is that an actuator having one end connected to the structure is connected to one arm, and the reciprocating motion of the arm is adjusted according to the vibration of the structure, It can be increased by applying seismic control force to the structure while adjusting the amplitude and period at each time.

By connecting a damper to the arm instead of the actuator or together with the actuator, a damping force is applied to the structure at the same time as the occurrence of sway, and the effect of vibration control is enhanced. In particular, by connecting the attenuator together with the actuator, the actuator can be activated when the vibration is small, and the attenuator can be activated when the vibration is large.

The vibration cycle of the weight is also adjusted momentarily by expanding or contracting the arm or the suspension rod in the axial direction in accordance with the vibration of the weight. In this case, the weight also has an optimum cycle for reducing the response. Is given, the effect of seismic control is enhanced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing one embodiment.

As shown in FIG. 1, the vibration control device 1 according to the present invention has parallel arms 2 and 2 which are rotatably supported on a structure 7 about a horizontal axis 21, and both arms 2 and 2 have a horizontal axis 21. A connecting link 3 that is rotatably connected around and a weight 6 that is connected to the tip of a suspension bar 5 that is suspended from the intermediate portion of the connecting link 3.
The weight 6 vibrates with the rotational movement of the arms 2 and 2 due to the vibration of the structure 7, consumes the vibration energy of the structure 7, and suppresses the shaking. The vibration control device 1 is installed directly on the structure 7 or on a frame assembled in the structure 7 or the like. When the weight 6 is installed directly in the structure 7, the horizontal axis 21 of the arm 2 as shown in FIG.
When it is located below, the vibration control device 1 is installed on an arbitrary floor because an opening is formed on the floor.

The arms 2 and 2 are pin-joined to the structure 7,
The connection link 3 is also pin-joined to each other to form a gate-shaped link device, and the connection link 3 is swung by the reciprocating rotary motion of the arms 2 and 2 around the horizontal axis 21 to cause the weight 6 to vibrate. .

One end of the suspension bar 5 is fixed to the connecting link 3 and vibrates while keeping a constant angle with the connecting link 3.

The weight 6 is located around an imaginary fulcrum which is the center of curvature of the locus on the extension of the connection point of the suspension bar 5 with the connecting link 3, and the distance from the fulcrum to the tip of the suspension bar 5 is the pendulum length. It vibrates as a pendulum. The imaginary fulcrum, that is, the pendulum length changes as the connecting link 3 swings,
The trajectory of the weight 6 draws a curve that is close to a straight line near the vertically suspended position. FIG. 3 shows the locus of the center of the weight 6 when the weight 6 is located below the horizontal axis 21 of the arm 2 shown in FIG.

Since the trajectory of the weight 6 changes depending on the length of the suspension rod 5 as well as the length of the arm 2 and the connecting link 3, the natural period of the weight 6 can be freely adjusted by changing these lengths. FIG. 4 shows the difference in the natural period of the weight 6 when the vertical distance L ₁ between the center of the weight 6 and the horizontal axis 21 of the arm 2 is changed as shown in FIG.

Although FIG. 1 shows a case in which an actuator 4 for adjusting the vibration of the weight 6 by adjusting the reciprocating motion thereof is connected to one arm 2, the vibration damping device 1 is connected by the connection of the actuator 4. It actively functions to absorb the vibration of the structure 7. The actuator 4 is erected in a direction that causes the arm 2 to rotate about a horizontal axis 21, and one end thereof is rotatably connected to the structure 7 and the other end to the arm 2 together.

The actuator 4 is a structure 7 that is instructed by a computer based on the vibration of the structure 7 and the vibration of the weight 6.
The arm 2 is caused to make a reciprocating motion optimal for reducing the vibration of the weight, and the amplitude and the cycle of the weight 6 are adjusted at each time to give a damping force to the structure 7, and a vibration that changes from moment to moment is generated. Suppress.

The actuator 4 also has a structure in which the swing of the structure 7 is small, and when the weight 6 does not vibrate, the arm 2
By virtue of the positive movement of the structure 7, the vibration of the structure 7 is suppressed at an early stage, and the link device including the arm 2 and the connecting link 3 is stably supported when the weight 6 vibrates.

A damping mechanism 8 may be connected to the arm 2 instead of the actuator 4 or together with the actuator 4 to perform a vibration control by applying a damping force to the structure 7 by a similar mechanism. FIG. 5 shows the arm 2 and the actuator 4
And the attenuator 8 are connected, the actuator 4 and the attenuator 8 can be selectively operated by connecting the both at the same time. Is damped by the attenuator 8 and can be effectively damped according to the degree of shaking. In this case, the actuator 4 and the attenuator 8
Operates by a command from the shake detection device 9 connected to both. Since the attenuator 8 is automatically operated by the movement of the arm 2, no power is required.

The time-dependent vibration cycle of the weight 6 is also adjusted by making the arm 2 and the suspension rod 5 extend and retract in the axial direction as shown in FIG. , The arm 2 and the suspension rod 5 operate independently or in combination with the actuator 4 to enhance the effect of vibration control.

[0023]

The present invention is as described above, and by vibrating the weight by utilizing the link device composed of the arm and the connecting link, which are rotatably connected to each other and are assembled in a gate shape, the weight is substantially vibrated. Since the pendulum length is larger than the suspended distance, the pendulum cycle can be extended while suppressing the height of the device.

An actuator is connected to one of the arms to adjust the reciprocating motion of the arm, or the length of the arm and the distance from the connecting link to the weight are changed to adjust the amplitude and the cycle of the weight. Therefore, it is possible to obtain the optimal seismic control force for suppressing the vibration of the structure.

By connecting a damper instead of the actuator, damping by damping force is possible, and when connected together with the actuator, effective damping according to the degree of shaking can be performed.

In addition , a complicated structure like the conventional multi-stage pendulum is used.
It is not a structure, and the cycle is relatively short to long.
The setting is easy, and the structure is simple because it is composed only of the link device and the weight , and it does not require high assembly precision or fine adjustment. No loss or noise.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a configuration example of a vibration control device.

FIG. 2 is an elevation view showing a part of a trajectory of a weight on xy coordinates.

FIG. 3 is an enlarged graph showing the trajectory of the weight shown in FIG.

FIG. 4 is a graph showing changes in the natural period of the device when the distance from the connecting link to the weight is changed.

FIG. 5 is an elevational view showing a vibration control device in which an actuator and an attenuator are connected to an arm.

[Explanation of symbols]

1 ... Vibration control device, 2 ... Arm, 21 ... Horizontal axis, 3 ...
Connection link, 4 ... Actuator, 5 ... Suspension rod, 6
…… Weight, 7 …… Structure, 8 …… Attenuator, 9 …… Vibration detection device.

Claims (4)

(57) [Claims] 1. A an arm for parallel rotatably supported around a horizontal axis against the structure, and a connecting link rotatably connected around a horizontal axis against the arms, one end of the connecting link intermediate A pendulum type vibration damping device that is fixed to a portion and that is configured by a suspension rod that hangs down while always maintaining a constant angle with a connecting link, and a weight that is connected to the lower end of the suspension rod. 2. The pendulum type vibration damping device according to claim 1, wherein one arm is connected to the structure at one end, and an actuator for causing rotation about a horizontal axis is connected to the arm. 3. The pendulum type vibration damping device according to claim 2, wherein a damper is connected to the arm instead of or together with the actuator. 4. The pendulum type vibration damping device according to claim 1, wherein the arm or the suspension rod expands and contracts in the axial direction with the vibration of the weight.