JPH0599270A - Damping device of frame structure - Google Patents

Abstract

PURPOSE:To realize effective utilization of most of members constituting a damping device as an inertia mass, and deal with the low frequency vibration with a long period specific to the space. CONSTITUTION:A three dimensional truss fabricated pillar 1 is constituted, and a plurality of longitudinal connecting members 3 and transverse connecting members 4 arranged in the vibratory direction are constituted to guide rails 11A, 11B at the specified position. These guide rails 11A, 11B are provided with inertia messes 12A, 12B which are slidabe in the longitudinal direction respectively. A driving device to slide the inertia masses 12A, 12B along the guide rails 11A, 11B is provided. And an accelerometer 13 to detect the vibration is provided in the three dimensional truss fabricated pillar 1. There is provided a vibration control device to actuate the driving device on the basis of the detected signal of the accelerometer 13 and to slide the respective inertia masses 12A, 12B at the specified velocity in the direction where the inertia forces of the respective vibrations are damped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure control method for a frame structure such as a truss or a rigid frame which effectively damps vibrations, particularly low-frequency vibrations peculiar to outer space, by utilizing inertial reaction force. Regarding the shaking device.

[0002]

2. Description of the Related Art A conventional vibration damping device for rotating an inertial mass in a space and damping the inertial force of vibration by the inertial force is
As shown in FIG. 10, a motor 63 is provided on a structure 61 through a support member 62, and a drive shaft of the motor 63 is rotatably provided with a lever 65 having a weight 64 at its tip.

[0003]

However, in the vibration damping device described above, the inertial mass is driven by the drive mechanism, that is, the lever 65 with the weight 64 is driven by the motor 63. There is a drawback that there is a portion that does not contribute to the generation of reaction force and the weight is large. Further, the stroke of the inertial mass cannot be lengthened because it is limited by the length of the lever 65, and for example, there is a problem that it is not possible to cope with low frequency vibration having a long period peculiar to outer space.

The present invention solves the above-mentioned problems and allows most of the members constituting the vibration damping device to be effectively utilized as inertial mass, and also copes with the low frequency vibration having a long period peculiar to outer space. An object of the present invention is to provide a vibration damping device for a frame structure to be obtained.

[0005]

In order to solve the above problems, the first means of the present invention is to construct a frame structure and to construct a plurality of spans at predetermined positions along the vibration direction in a guide rail, Each of these guide rails is provided with an inertial mass that is slidable in the longitudinal direction, a drive device that slides the inertial mass along the guide rails is provided on this inertial mass, and a vibration detector that detects vibration is provided on the frame structure. A vibration control device is provided which operates the drive device based on a detection signal of the vibration detector and slides each inertial mass at a predetermined speed in a direction in which the inertial force of the vibration is attenuated.

A second means is to construct a skeleton structure and to construct a plurality of spans at predetermined positions along the vibration direction on guide rails, and to provide each of these guide rails with an inertial mass slidable in the longitudinal direction. , Each of these inertial masses, a drive device for sliding the inertial mass along the guide rails, a drive source of this drive device, a vibration detector for detecting the displacement of the frame structure, and a detection signal of this vibration detector. Based on this, a vibration control device that operates the drive device to slide the inertial mass at a predetermined speed in a direction in which the inertial force of vibration is attenuated is integrally provided.

[0007]

In the above structure, when the vibration detector detects the vibration of the frame structure, the vibration control device, based on the detected value, causes the vibration control device to generate an inertial force against the inertial force of the vibration. And the velocity are instantaneously calculated, and a drive device for a predetermined inertial mass is driven to slide the inertial mass in a predetermined direction at a predetermined speed to damp the vibration of the frame structure.

Therefore, each inertial mass can slide over the entire length of the span, and in particular, it is possible to deal with low-frequency vibration having a long period peculiar to outer space, and the first means drives each inertial mass. Since the device is provided, the mass of the driving device can be effectively used for damping the vibration as compared with the conventional inertial mass. In the second means, the driving device and the driving device provided for each inertial mass can be used. source,
The vibration detector and the vibration control device can all be effectively used as a mass for damping the vibration. Moreover,
Since this vibration damping device utilizes the span that is a constituent element of the frame structure, it can be arranged by utilizing a part without changing the structure of the frame structure, and only a slight change is required. It can be easily installed in an effective direction at the most optimal part of the frame structure.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a vibration damping device for a frame structure according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, four pillar members 2 and a vertical connecting member 3 for connecting the pillar members 2 in directions orthogonal to each other.
And the horizontal connecting member 4 and the pillar member 2 and the diagonal member 5 connecting the nodes of the vertical connecting member 3 and the horizontal connecting member 4 form a space truss assembly column 1, and the space truss assembly column 1 is located at a predetermined position. This damping device is provided. That is, at a predetermined position, a pair of rectangular column-shaped vertical connecting members 3 and a pair of rectangular column-shaped horizontal connecting members 4 along the vibration directions A and B of the three-dimensional truss-assembled column 1 are formed on the guide rails 11A and 11B, respectively, over the entire length,
Inertia masses 12A and 12B are respectively slidably arranged on these guide rails 11A and 11B along the length direction of the guide rails 11A and 11B. In addition, a strain gauge or an accelerometer 13 for detecting vibration of the space truss assembly column 1 is provided on the column member 2 near the vertical coupling member 3 and the horizontal coupling member 4.
Is attached to the inertial masses 12A and 12B, and the inertial masses 12A and 12B are slid based on the detection values of the strain gauges or the accelerometers 13 to calculate a direction and a sliding speed for damping the vibrations. A control box 16 including a vibration control device 15 that outputs the control signal to the inertial masses 12A and 12B is provided.

As shown in FIGS. 2 and 3, the inertial masses 12A and 12B are, for example, guide rails 11A and 11B.
Is a columnar body having a slide hole 21 penetrating therethrough in the axial center thereof, and is housed in a housing space 22 formed in the slide hole 21,
The guide roller 23 and the drive roller 24, which come into contact with the four surfaces of the guide rails 11A and 11B, respectively, are the support shaft 23.
It is rotatably supported via a and 24a. The drive motor 25 is attached to the support shaft 24a of the drive roller 24.
Are connected to each other to form a driving device 26, and at the front and rear positions of the guide roller 23 and the driving roller 24,
A bearing ring 27 for guiding the slide of the inertial masses 12A, 12B is provided.

In the above structure, when vibration occurs in the three-dimensional truss assembly column 1, the vibration is generated by the strain gauge or accelerometer 1.
3 detects and the detection signal is input to the calculation unit of the vibration control device 15, the calculation unit sets the rotation direction and the rotation speed of the drive motor 25 so that a reaction force that attenuates the distortion or the acceleration is obtained. It calculates at high speed and outputs a control signal to the drive motor 25. As a result, the drive motor 25 is driven to rotate the drive roller 24, the inertia masses 12A and 12B are moved along the guide rail 2 in a predetermined direction at a predetermined speed, and are generated by the mass and movement of the inertia masses 12A and 12B. The inertial force acts as a reaction force that dampens the inertial force of the vibration of the space truss assembly column 1, and quickly damps the vibration of the space truss assembly column 1.

Incidentally, instead of the drive device 26 using the drive motor 25 and the drive roller 24, a second embodiment using a linear motor 33 may be used as shown in FIGS. That is, on the upper surfaces of the guide rails 31A and 31B, permanent magnets 33a that form the secondary side coil of the linear motor 33 are arranged along the length direction so that the poles alternate, and the inertia is maintained over the entire length of the slide stroke. Primary coils 31b are provided on the masses 32A and 32B. According to the second embodiment, the levitation force and the repulsive force obtained by the linear motor 33 can be utilized to significantly reduce the frictional resistance, so that the vibration damping device can be operated more efficiently.

Next, a third embodiment will be described with reference to FIGS. 6 and 7. In the third embodiment, the inertial masses 12A and 12B, the accelerometer 13, and the control box 16 which are separately provided in the first and second embodiments are integrally provided in the inertial masses 42A and 42B, respectively. Is. That is, the accelerometer 4 is attached to the inertial masses 42A and 42B that are slidably fitted onto the guide rails 41A and 41B.
3, the columnar inertial masses 42A, 42
A solar cell 44 arranged on the outer peripheral surface of B, and a solar cell 44
Inertia mass 42A, 42B for storing electricity generated in
A drive power source including a storage battery 45 housed inside and a vibration control device 46 are integrally provided.

The fourth embodiment shown in FIGS. 8 and 9 employs the linear motor 33 of the second embodiment as a drive device for the inertial masses 52A and 52B slidably fitted on the guide rails 51A and 51B. The same members as those in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted.

As another embodiment, instead of the drive roller 24 of the first and third embodiments, guide rails 11A,
A pinion that meshes with the rack arranged in 11B may be adopted, and thus power transmission can be surely performed.

[0017]

As described above, according to the present invention,
When the vibration detector detects the vibration of the frame structure, based on this detection value, the vibration control device instantaneously calculates the sliding direction and speed of the inertial mass so that a reaction force that opposes the inertial force of the vibration is generated. , A predetermined inertia mass drive device is driven to slide the inertia mass in a predetermined direction at a predetermined speed to damp vibrations of the frame structure.

Therefore, each inertial mass can be slid over the entire length of the span, and in particular, it is possible to cope with a low frequency vibration having a long period peculiar to outer space.
Further, in the first means, since the drive device is provided in each inertial mass, the mass of the drive device can be effectively used for damping the vibration as compared with the conventional inertial mass, and in the second means, The drive device, the drive source, the vibration detector, and the vibration control device that are integrally provided on the inertial mass can all be effectively used as a mass for damping the vibration. Moreover, since this vibration damping device utilizes the span that is a constituent element of the frame structure, it can be partially arranged without changing the structure of the frame structure, and only a slight modification is required. At the same time, it can be easily provided at the most optimal portion of the frame structure in an effective direction.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a first embodiment of a vibration damping device for a frame structure according to the present invention.

FIG. 2 is a vertical sectional view of the inertial mass according to the first embodiment.

FIG. 3 is a cross-sectional view of the inertial mass according to the first embodiment.

FIG. 4 is a vertical sectional view of an inertial mass showing a second embodiment of the vibration damping device.

FIG. 5 is a transverse sectional view of the inertial mass of the second embodiment.

FIG. 6 is a longitudinal sectional view of an inertial mass showing a third embodiment of the vibration damping device.

FIG. 7 is a transverse sectional view of the inertial mass according to the third embodiment.

FIG. 8 is a vertical sectional view of an inertial mass showing a fourth embodiment of the vibration damping device.

FIG. 9 is a transverse sectional view of the inertial mass according to the fourth embodiment.

FIG. 10 is a perspective view showing a conventional inertial mass.

[Explanation of symbols]

 1 Space truss assembly pillar 2 Column material 3 Vertical connection material 4 Horizontal connection material 5 Oblique material 11A, 11B Guide rails 12A, 12B Inertial mass 13 Accelerometer 14 Drive power supply 15 Vibration control device 24 Drive roller 25 Drive motor 26 Drive device 31A, 31B Guide rail 32A, 32B Inertia mass 33 Linear motor 41A, 41B Guide rail 42A, 42B Inertia mass 43 Accelerometer 44 Solar cell 45 Storage battery 51A, 51B Guide rail 52A, 52B Inertia mass

Front page continuation (72) Minoru Saito Minoru Saito 5-3-28 Nishikujo, Konohana-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. Issue Hitachi Shipbuilding Co., Ltd.

Claims (2)

[Claims] 1. A frame structure is constructed to form a plurality of spans at predetermined positions along a vibration direction on a guide rail, and each of these guide rails is provided with an inertial mass slidable in the longitudinal direction. A drive device for sliding the inertial mass along the guide rail is provided, and a vibration detector for detecting vibration is provided in the frame structure, and the drive device is operated based on the detection signal of the vibration detector to activate each inertial mass. A vibration control device for a frame structure, wherein a vibration control device for sliding at a predetermined speed in a direction in which the inertial force of vibration is attenuated is provided. 2. A skeleton structure is formed, and a plurality of spans at predetermined positions along the vibration direction are formed on guide rails, and each of these guide rails is provided with an inertial mass slidable in the longitudinal direction. A drive device that slides the inertial mass along the guide rails, a drive source of the drive device, a vibration detector that detects displacement of the frame structure, and the drive device based on a detection signal of the vibration detector. And a vibration control device for sliding the inertial mass at a predetermined speed in a direction in which the inertial force of vibration is attenuated, and a vibration damping device for a frame structure.