JPH1082204A - Frictional-force control type vibration damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To take measures to large and small various quakes by an earthquake and a wind. SOLUTION: The frictional-force control type vibration damper is constituted in such a manner that a sliding rod 6 and a friction material frictionally engaged with the sliding rod 6 are disposed between the upper floor 2 and lower floor 1 of a structure and both floors are combined and the friction material and the sliding rod are pushed by an actuator. The device, in which a sensor 7 sensing the quakes of the structure is installed, the quakes of the structure sensed by the sensor 7 are transmited to the actuator as a signal, and the pushing force of the actuator is controlled, is mounted.

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 for structures such as buildings against earthquakes and wind.

[0002]

2. Description of the Related Art Hitherto, various proposals have been made as measures against shaking of structures such as buildings due to an earthquake or wind. To illustrate some of them, FIG. 3 shows an example of a device for generating a constant frictional force by a disc spring and damping the vibration. That is, reference numeral 20 denotes a mounting piece to the upper floor, and reference numeral 21 denotes a mounting piece to the lower floor, which are fixed to each floor. An outer cylinder 22 is pivotally attached to the attachment piece 21, while a rod 23 is pivotally attached to the attachment piece 20, and the rod 23 is attached to the outer cylinder 22.
Is inserted inside. The rod 23 is surrounded by sliders 24 at both ends in the outer cylinder 22, and a disc spring 25 is interposed between the sliders 24. In the figure, reference numeral 26 denotes a wedge inner cylinder inserted between the slider 24 and the disc spring 25 and between the left and right support portions 27 and 28.

[0003] Such a device, as shown in FIG.
Between the upper floor B and the upper floor B by the respective mounting portions 20 and 21. The wedge inner cylinder 26 is pushed and spread in the axial direction by the force of the disc spring 25 attached to the inside of the outer cylinder 22 while being bent, and at the same time, the wedge outer cylinder 26 ′ is pushed in the circumferential direction. The slider 24 is moved to the outer cylinder 22 by the wedge outer cylinder 26 '.
To generate a frictional resistance against the relative movement between the rod 23 and the outer cylinder 22 to exert a vibration damping action.

FIG. 5 shows a vibration damping device of the type that generates resistance to vibration by plastic deformation of lead. Reference numeral 29 denotes a mounting piece for the upper floor, and reference numeral 30 denotes a mounting piece for the lower floor, which are mounted on each floor as in FIG. An outer cylinder 31 is fixed to the attachment piece 30, and a rod 32 having an enlarged portion 32 ′ at the center is attached to the attachment piece 29. The rod 32 is inserted into the outer cylinder 31 and is supported by a bearing 33. Lead 3 between the outer cylinder 31 and the rod 32 between the bearings 33
4 are filled. The expanded portion 32 ′ of the rod 32 constrained by the bearing 33 pushes and spreads the cylindrical lead 34 clogging the outside, and moves axially while plastically deforming. The resisting force at that time absorbs energy with respect to the unfolding deformation of the upper floor and the lower floor, and exerts a vibration damping action.

In FIG. 6, a lever 37 is suspended from an upper floor 35 between an upper floor 35 and a lower floor 36. The upper floor side is support plate 3
8 is fixed with a pin 39, and below the pin 39 is fixed with a pin 42 on the upper ends of left and right columns 40 and 41. An oil damper 43 is mounted between the lower end of the lever 37 and the lower floor 36. The deformation of the upper floor 35 and the lower floor 36 occurs between the pins 39 and 42, the deformation being doubled at the lower end of the lever by means of the lever 37. Lever 37
Of the lower floor and the upper floor 35, energy is absorbed between the upper and lower floors by viscous damping force of the oil damper 43 connected to the lower floor 36.

[0006]

Since all of the above prior arts are of the constant frictional force type, if they are designed on the assumption of a large earthquake, they are not only effective at the time of a small earthquake, but may be worse on the contrary. . If it is designed for a small earthquake, the effect is small at the time of a large earthquake. In view of the above, the present invention provides a vibration damping device that responds to a wide range from large to small shaking of a structure and controls the shaking by exerting a linear frictional force.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a sliding rod and a friction material frictionally engaging with the sliding rod are disposed between an upper floor and a lower floor of a structure, and the two floors are connected to each other. A friction control type vibration damping device characterized in that a friction material and a sliding rod are pressed by an actuator. The actuator receives, as a signal, the sway detected by a sensor provided for detecting the sway of the structure, and controls the pressing force on the sliding rod. As the actuator, a piezo element or a giant magnetostrictive actuator is suitable. As a friction material, for example, a resin mold is suitable.

[0008]

According to the present invention, a displacement caused by vibration of a structure is detected by a sensor, an optimum frictional force is calculated from the detected relative speed, and a command of a pressing force necessary for realizing the frictional force is given to an actuator. The frictional force is kept constant according to the fluctuation of the fluctuation, and it is possible to cope with a wide fluctuation from a large fluctuation to a small fluctuation.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a frictional force control type vibration damping device of the present invention mounted on a structure. In the figure, 1 is the lower floor,
Reference numeral 2 denotes an upper floor, and a variable friction device 5 is fixed to upper ends of columns 3 and 4 connected to the lower floor 1. The variable friction device 5 is in frictional engagement with the sliding rod 6. Both ends of the sliding rod 6 are connected to the upper floor 2. Upper floor 2 and lower floor 1
The frictional force of the variable friction device 5 acts on the relative deformation of The variable friction device 5 is provided with a vibration detector such as a relative speed meter 7 for detecting the relative speed with respect to the sliding rod and for controlling the detected relative speed with the controller 8.
To calculate the appropriate pressing force. The command of the pressing force of the calculation result is given to the variable friction device 5, and the friction force is appropriately controlled.

FIG. 2 is a plan view of the variable friction device 5, and reference numeral 9 denotes a friction material surrounding the sliding rod 6, which is made of a resin mold. A piezo element actuator 10 applies a pressing force calculated and indicated by the controller 8 to the friction material 9. Reference numeral 11 denotes a pressing screw, and the actuator 10
Adjust the initial pressing force when no force is generated. A leaf spring 12 receives a frictional force and does not transmit a shearing force to the actuator.

[0011]

According to the present invention, by reducing the frictional force according to the magnitude of the vibration of the structure due to the earthquake or wind force, it is possible to reduce the vibration for the small vibration and the vibration for the large vibration. Since the two devices can be compatible, a wide range of vibration damping action can be exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional example.

FIG. 4 is an explanatory diagram of a use mode of the conventional example of FIG. 3;

FIG. 5 is an explanatory diagram of another conventional example.

FIG. 6 is an explanatory diagram of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower floor 2 Upper floor 3, 4 Prop 5 Variable friction device 6 Sliding rod 7 Relative speedometer 8 Controller 9 Friction material 10 Piezo element actuator 11 Pressing screw 12 Leaf spring

Claims (4)

[Claims] A sliding rod and a friction material that frictionally engages with the sliding rod are disposed between an upper floor and a lower floor of the structure, and the two floors are connected to each other. And a frictional force control type vibration damping device. 2. The frictional force according to claim 1, further comprising a sensor for detecting a vibration of the structure, a device for transmitting the vibration of the structure detected by the sensor as a signal to the actuator, and controlling a pressing force of the actuator. Control type vibration damping device. 3. The frictional force control type vibration damping device according to claim 1, wherein a piezo element or a giant magnetostrictive actuator is used as the actuator. 4. The vibration control device according to claim 1, wherein the friction material is a resin mold.