JPH06185242A - Variable attenuating and damping device - Google Patents

Abstract

PURPOSE:To vary the revolutional resistance of a rotary member or the attenuation coefficient of a damper and the natural frequency, by loading the revolutional resistance according to the viscosity of an electrical viscous fluid on a rotary member and varying the voltage applied between electrodes or the voltage applied on the electrical viscous fluid. CONSTITUTION:An attenuation device 9 is provided with a casing 13 fixed to an applied structure 2 and equipped with an electrode 16 in the inside, wires extended to a weighty part 4, and a rotary member 21 wound by the wires and rotatably supported by the casing 13 and equipped with another electrode 22 at the outer side. An electroviscous fluid 23 of which viscosity is controlled by the applied voltage is contained in the casing 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable damping vibration control system capable of damping a structure and changing its damping characteristic.

[0002]

2. Description of the Related Art Conventionally, a laminated rubber having one end fixed to an installation portion, a weight portion fixed to the other end of the laminated rubber, and a damping device provided between the weight portion and the installation portion. Have
As a vibration damping device for damping a structure, there is a passive tuned mass damper or an active mass damper that applies a driving force to it. In these vibration damping devices, the natural period and damping constant of the device are set so that the vibration of the structure can be effectively reduced.

[0003]

However, in order to accurately match the natural period of the above-mentioned device with the natural period of the structure, a laborious work such as changing the weight of the weight part is required. There is. Generally, the predominant vibration period of a structure changes depending on the age of the structure, the amplitude of the structure, the wind direction, etc. It becomes necessary to change the constant. Further, various types of damping devices such as the tuned mass damper or the active mass damper have been adopted, but when any damping device cannot always obtain the optimum damping performance due to amplitude dependency or the like. There is.

An object of the present invention is to provide a variable damping and damping device which can easily adjust and change the natural period and damping constant and can always obtain optimum damping performance.

[0005]

In order to achieve the above object, the variable damping vibration damping device of the present invention has a laminated rubber having one end side fixed to the installation portion and another end side fixed to the laminated rubber. And a damping device provided between the weight part and the installation part, wherein the damping device is fixed to the installation part and an electrode is provided on the inner peripheral side. A casing, a wire stretched around the weight portion, and a rotating member around which the wire is wound and which is rotatably supported by the casing and provided with an electrode on an outer peripheral side of a portion located inside the casing. The electro-rheological fluid, the viscosity of which is controlled by the applied voltage, is enclosed in the casing.

[0006]

According to the variable damping vibration damper of the present invention, when the weight portion vibrates with respect to the installation portion, the laminated rubber is deformed and the wire stretched over the weight portion moves together with the weight portion. As a result, the rotating member wound with the wire rotates. Here, since the electrorheological fluid is enclosed in the casing that supports the rotating member, the rotating resistance is applied to the rotating member according to the viscosity of the electrorheological fluid. By changing the voltage applied between the fixed electrode and the electrode provided on the outer peripheral side of the rotating member, that is, the voltage applied to the electrorheological fluid, the rotation resistance of the rotating member, that is, the damping constant and the natural period of the vibration damping device are changed. It will change. Therefore, the damping constant and the natural period can be changed without performing a troublesome work.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A variable damping vibration damping device according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2
The variable damping vibration damping device 1 of the present embodiment is shown in FIG.
2 has four laminated rubbers 3, one end of which is fixedly installed at a predetermined position, and a rectangular parallelepiped weight (weight part) 4 whose corners are fixedly supported, at the other end of the laminated rubber 3. is doing.

Eight wire support portions 5 are provided at predetermined positions in the middle of the lower surface of the weight 4 so as not to interfere with the laminated rubber 3 with respect to the movement of the weight 4. Wires 6 are stretched between the wire supporting portions 5 which are parallel to the respective side portions of the weight 4, so that the adjacent wires 6 form an angle of 90 ° with each other. Has become. Here, as shown in FIG. 3, each wire support part 5 has a weight 4
A guide rail 8 fitted on the lower surface 7 side so as to extend along the lower surface 7 and in a direction substantially perpendicular to the extending direction of the supporting wire 6 so as to be movable along the extending direction. Has been done. As a result, the wire 6 moves together with the weight 4 in the direction along the tensioning direction in a state of being wound around the damping device main body 9 described later, and with respect to the movement of the weight 4 in the direction orthogonal thereto. No effect (that is, no unreasonable force is applied when the weight 4 moves in this direction)
It will be in a free state.

A damping device body 9 which constitutes a damping device together with the wire 6 is provided on the installation part 2 between the pair of wire supporting parts 5. The damping device body 9 is shown in FIGS. 4 and 5. As shown, the cylindrical portion 10, an upper closing portion 11 that closes the upper end of the cylindrical portion 10, and a lower closing member 12 that is fitted to the cylindrical portion 10 to close the lower end of the cylindrical portion 10.
And a casing 13 fixedly installed on the installation portion 2. The upper closing portion 11 and the lower closing member 12 of the casing 13 have support holes 14, 15 centered on the axis of the cylindrical portion 10. Are formed respectively. in addition,
Cylindrical portion 10 between the upper closing portion 11 and the lower closing member 12
An electrode 16 that can be energized from the outside is fixed to the entire inner peripheral surface of the.

The casing 13 is rotatably supported in the support hole 14 of the upper closed portion 11, and is also casing 1.
3, the upper support shaft portion 18 around which the wire 6 is wound around the tip end side protruding from 3, the lower support shaft portion 19 rotatably supported in the support hole 15 of the lower closing member 12, and the members provided between them. A stepped cylindrical rotating member 21 having a large-diameter main shaft portion 20 is provided. In addition, an electrode 22 that can be energized from the outside is fixed to the outer peripheral surface of the main shaft portion 20 of the rotating member 21 so as to face the electrode 16, and between the electrode 22 and the electrode 16. An annular constant gap is formed. Although not shown, the inside and outside of the casing 13 are prevented from communicating with each other through the support holes 14 and 15 in the vicinity of the support holes 14 and 15 that support the rotary member 21. A seal structure is used.

An electrorheological fluid 23, the viscosity of which can be controlled to be changed by changing the applied voltage (that is, the electric field strength), is enclosed in the gap between the electrode 16 of the casing 13 and the electrode 22 of the rotating member 21. . The electrodes 16 and 22 are subjected to a predetermined insulation treatment so that they are not energized except through the electrorheological fluid 23.

According to the variable damping vibration damping device 1 of the present embodiment having the above-mentioned structure, when the weight 4 vibrates with respect to the installation portion 2, the laminated rubber 3 is deformed and the weight 4 is stretched. One of the wound wires 6 along the vibration direction of the weight 4 moves together with the weight 4, whereby the main shaft portion 20 of the rotating member 21 of the damping device body 9 around which the wire 6 is wound. Will rotate in the casing 13. Here, since the electrorheological fluid 23 is enclosed in the casing 13 that supports the rotating member 21, the rotation resistance corresponding to the viscosity of the electrorheological fluid 23 is applied to the rotating member 21. Therefore, the casing By changing the voltage applied between the electrode 16 provided inside 13 and the electrode 22 provided outside the rotary member 21, that is, the voltage applied to the electrorheological fluid 23, the rotational resistance of the rotary member 21, that is, the control. The damping constant and the natural period of the vibration device 1 change. Therefore, the damping constant and the natural period can be easily changed without performing a troublesome work.

Although not shown, a sensor for detecting the vibration state of the weight 4 with respect to the installation portion 2 and an optimal damping constant are determined from information from this sensor to determine both electrodes 16,
By providing a control device that controls the voltage applied between the two, the performance as a semi-active damper that controls the natural period and the damping constant of the variable damping vibration damping device 1 in real time according to the vibration state of the structure is exhibited. Will be done. In this case, when the electrorheological fluid 23 changes the electric field strength, its equivalent viscosity changes instantaneously, so that no response delay occurs. Further, it also has a function as a stopper that regulates the vibration of the weight 4 by instantly applying a high voltage to the electrorheological fluid 23.

The casing 13 and the rotating member 21
When the electrodes are formed of a conductive material, it is not necessary to fix the electrodes to each of them, and a voltage may be applied directly to the casing 13 and the rotating member 21 (in this case, the casing 13 and the rotating member 21 serve as electrodes). Also in this case, the casing 13 and the rotating member 21 are subjected to a predetermined insulation treatment so that they are not energized except through the electrorheological fluid 23.

When the resistance force of the electrorheological fluid is increased, as shown in FIG. 6, the electrodes 22 provided on the main shaft portion 20 of the rotating member 21 are made of a plurality of disc-shaped plates made of a conductive material. In addition, a plurality of disk-shaped plates made of a conductive material are arranged and fixed alternately with the plates of the rotating member 21 as the electrodes 16 provided inside the casing 13, or as shown in FIG. The main shaft portion 20 of the member 21 is formed into a disk shape, and as the electrodes 22 provided on the main shaft portion 20, a plurality of cylindrical plates made of a conductive material and having different diameters are fixed concentrically along the axial direction,
It is also possible to dispose a plurality of cylindrical plates made of a conductive material and having different diameters as the electrodes 16 in the casing 13 so as to alternate with the plates of the rotating member along the axial direction.

[0016]

As described above in detail, according to the variable damping vibration damping device of the present invention, the rotational resistance corresponding to the viscosity of the electrorheological fluid is applied to the rotating member of the damping device. By changing the voltage applied between the electrode provided on the side of the rotary member and the electrode provided on the outer peripheral side of the rotary member, that is, the voltage applied to the electrorheological fluid, the rotation resistance of the rotary member, that is, the damping constant of the vibration damping device and The natural period will change. Therefore, the damping constant and the natural period can be easily changed without performing a troublesome work.

[Brief description of drawings]

FIG. 1 is a front view schematically showing a variable damping vibration damping device according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing a variable damping vibration damping device according to an embodiment of the present invention, as viewed from below in FIG.

FIG. 3 is a perspective view showing a wire support portion of the variable damping vibration damper according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a damping device of a variable damping vibration damping device according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a damping device of a variable damping vibration damping device according to an embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a damping device of a variable damping vibration damping device according to another embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing a damping device of a variable damping vibration damping device according to still another embodiment of the present invention.

[Explanation of reference numerals] 1 variable damping vibration damping device 2 installation part 3 laminated rubber 4 weight part (weight) 6 wire 9 damping device body 13 casing 16, 22 electrode 21 rotating member 23 electro-rheological fluid

Front page continued (72) Inventor Nikiho Ishikawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Yoshihiro Kurita 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Incorporated (72) Inventor Shoji Hayashi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (1)

[Claims] 1. A laminated rubber having one end fixed to the installation portion, a weight portion fixed to the other end of the laminated rubber, and a damping device provided between the weight portion and the installation portion. In the vibration damping device, the damping device includes a casing fixed to the installation portion and provided with an electrode on an inner peripheral side, a wire stretched around the weight portion, and the casing wound with the wire. A rotating member that is rotatably supported in the casing and has an electrode provided on the outer peripheral side of a portion located inside the casing, and an electrorheological fluid whose viscosity is controlled by an applied voltage is enclosed in the casing. A variable damping vibration damping device characterized by: