JPH03134338A - Damping device - Google Patents

Abstract

PURPOSE:To obtain a damping effect in all the horizontal directions of a structure by constituting so that a vibration body held to the structure through driving of a ball threads which are arranged in two orthogonal directions is reciprocally moved synchronously with vibration of the structure. CONSTITUTION:When a motor 6 drives a connection axis 8 by a command from a computer or a controller, not shown, a ball thread 4 is rotated through a gear 7, and a nut part 4b set to it is moved in the direction of the ball thread 4. At the same time, a beam 3 fitted to it moves a slider 2, and the slider 2 drives a vibration body 1 through a universal joint 10 and a slide jig 9. This movement is carried out synchronously with a vibration cycle of a structure 01 and shifted by half a cycle. As a result, energy of the reciprocal motion of the vibration body 1 offsets vibration energy of the structure 01, and the structure 01 can be damped.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vibration damping device for structures and the like.

[Conventional technology]

A conventional vibration damping device that is attached to a structure, etc. to be damped and drives a vibrating body to damp the structure, etc. has a vibration damping device that is mounted on a rail 21 supported by wheels ρ, as shown in Fig. 8. As shown in FIG. 9, there is a device for reciprocating the vibrating body 1 using a cylinder-type vibrator n, and a rack 25a and a pinion 2 for rotating the motor.
5b, etc., there were devices that changed the drive to reciprocating linear motion.

[Problem to be solved by the invention]

The conventional vibration damping device described above had the following problems to be solved.

In other words, the trap is effective in damping vibrations in all horizontal directions.

It is necessary to drive the vibrating body in two orthogonal directions.

Conventional vibration damping devices have a problem in that the damping effect is limited to one direction of the installed rail or rack.

[Means to solve the problem]

As a solution to the above problems, the present invention includes a vibrating body that is held horizontally movable with respect to a structure to be damped, and a screw shaft that is provided with a nut portion on the side of the vibrating body and is screwed into the nut portion on the side of the structure. A plurality of ball screws are provided in the structure and are orthogonal to each other with height differences in the horizontal direction, and a motor that rotates the ball screws and reciprocates the vibrating body according to the vibration cycle of the structure. It is an object of the present invention to provide a vibration damping device characterized by the following characteristics.

[For production]

Since the present invention is configured as described above, it has the following effects.

In other words, a ball screw nut is provided on a vibrating body that is horizontally movable in a structure, and a screw shaft that is screwed into the nut is provided on the structure so that the vibrating body moves back and forth according to the vibration period of the structure. Since the ball screw is rotated at Tanabata so that the reciprocating movement of the vibrating body and the vibration of the structure are synchronized. Therefore, the vibration of the structure can be damped by shifting the phase between the vibration of the structure and the reciprocating movement of the vibrating body. Further, since a plurality of ball screws are provided in orthogonal directions, any vibration in the plane direction can be suppressed.

〔Example〕

A first embodiment of the present invention will be described with reference to FIG.

In the figure, the bottom of the vibrating body 1 suspended from the structure 01 in a multi-stage pendulum shape by the cables la and 1b is drilled out, a hole 1c is provided, and the slide jig 9 is installed therein. The drilled hole IC may be passed through.An object with a small friction coefficient or a sliding guide 11 is interposed between the sliding part of the vibrating body 1 and the slide jig 9, and the lower end of the slide jig 9 is a universal It is connected to a slider 2 via a joint 10. Inside the slider 2, a beam 3 passes through the slider 2 so as to be able to shift vertically in two plane directions and to be orthogonal in a horizontal plane. Slider 2
An object with a small friction coefficient or a sliding guide 11 is interposed in the sliding portion between the beam 3 and the beam 3. A nut portion 4b of a ball screw 4 is attached to both ends of the beam 30, and a screw shaft 4a of the ball screw 4 is threaded through the nut portion 4b. The screw shaft 4a of the ball screw 4 is supported by a bearing 5 on the structure side. A gear 7 is attached to one end of the screw shaft 4a, and meshes with a gear 7 provided on a connecting shaft 8. The connecting shaft 8 is rotatably directly connected to the motor 6.

Here, when the motor 6 drives the connecting shaft 8 in response to a command from a computer or controller (not shown), the gear 7
, the ball screw 4 is rotated, and the nut portion 4b set thereon moves in the direction of the ball screw 4. At the same time, the beam 3 attached to it moves the slider 2;

Universal joint 10. Via the slide 9 jig 9, the vibrating body 1 is driven. This movement is performed in accordance with the vibration period of the structure and with a shift of half a period. As a result, the energy of the reciprocating motion of the vibrating body cancels out the vibration energy of the structure, and the structure is damped. In this embodiment, the vibrating body 1 is suspended in a multi-stage pendulum shape, so it moves in the horizontal direction (and also slightly moves in the vertical direction. This vertical movement is caused by the slide 9 jig 9 sliding up and down. Also, due to manufacturing errors in the multi-stage pendulum, the vibrating body 1 may move in the horizontal direction (9 rotations). can be absorbed by

In addition, the drive in two orthogonal directions is performed by the slider 2 and the beam 3.
slides in each orthogonal direction, so it acts equally in any direction within the plane.

and have the same effect.

FIG. 2 is a diagram of a second embodiment in which the slide jig 9 shown in FIG. 1(a) is attached to the bottom surface of the vibrating body 1.

Slide 9 Jig 9 is an object with a small friction coefficient or a guide 11 for sliding 9 and a cylindrical metal fitting 12 for holding it.
Therefore, it is attached to the vibrating body 1. In this embodiment, the universal joint 10 at the lower end of the slide jig 9 and the slider 2 are connected via a safety device 13 that disconnects with a constant load.If an abnormal load is applied due to malfunction or failure, etc. By separating the vibrating body 1 and the slider 2 here, the structure on the drive side is protected. Note that this safety device 13 may be installed between the metal fitting 12 and the vibrating body 1.

According to this embodiment, the hollow hole 1c shown in FIG.
It has the advantage of being easier to construct since there is no need to drill holes.

Figure 3 shows the vibrating body 1 and slider 2 in Figure 1(a).
FIG. 3 is a view of a third embodiment in which the vertical movement and inclination of the vibrating body 1 are absorbed by a vertical slide mechanism provided between the end of the beam 3 and the nut portion 4b of the ball screw 4. 14 is a slide 0 guide that constitutes the slide mechanism; 1
Similarly, numerals 5 and 5 each indicate a rail. The column is a sliding portion that absorbs a change in length that occurs when the beam 3 is tilted due to the inclination of the vibrating body 1. Note that a plurality of slide guides 14° rails 15 may be attached to one end of the beam 3.

FIG. 4 shows a configuration in which the slider 2 does not directly slide around the beam 3 in FIG. 1(a), but a slide guide 14 attached to the slider 2 slides on a rail 15 attached to the beam 3. It is a figure of a 4th example. In this embodiment, the beam 3 passes outside the slider 2 rather than inside it, so there is an advantage that the beam 3 can be made larger when a large driving force is required. In addition, slide guy)”1
4. A plurality of rails 15 may be provided in one direction.

Figure 5 shows the ball screw 4 in the working direction in Figure 1(b).
FIG. 5 is a diagram of a fifth embodiment in which the drive is performed by 6.2 motors. In this embodiment, the motor 6 is a speed reducer or a speed increaser 1.
6, and a torque limiter 17 that protects the drive system by causing slippage due to excessive torque.

The ball screw 4 is driven. Note that the connecting shaft 8 can be omitted if the synchronization between the left and right ball screws 4 is sufficient. Further, the motor 6 can further drive a plurality of ball screws 4.

FIG. 6 is a diagram of a sixth embodiment in which the ball screws 4 are not arranged at both ends of the beam 3 in FIG. 1(b), but are arranged only at one end, two sets each. This embodiment has the advantage that the number of screw shafts 4a can be reduced.

FIG. 7 shows how the vibrating body 1 shown in FIG. 3(a) is not suspended in a multi-stage swing, but the base 1 on the structure side is
9 is a diagram of a seventh embodiment configured to be able to reciprocate in any direction within a horizontal plane by being placed on a bicycle. This embodiment has the advantage that the configuration is simple.

As described above, in the first to seventh embodiments, the vibrating body 1 is the cable body 1a+1b.
Although the example in which the vibrating body 1 is suspended in multiple stages and the example in which it is placed on the ball 18 have been described, the means for holding the vibrating body 1 is not limited to the above two examples, and any means may be used without departing from the purpose of the invention. According to the first to seventh embodiments, the vibrating body 1 is moved back and forth in response to the vibration of the structure in an arbitrary direction in the horizontal direction, and is optimally tuned. Since input energy and vibration energy can be canceled out, there is an advantage that the vibration of the structure can be effectively suppressed.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

In other words, by driving a ball screw placed in two direct firing directions with a motor, a vibrating body held in a structure can be moved back and forth in all horizontal directions in synchronization with the vibration of the structure, and the vibration of the structure in all directions can be reduced. However, a damping effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a first embodiment of the present invention, in which (a) is a longitudinal cross-sectional view, (b) is a cross-sectional (plan) view taken along the line bb in (a), and FIG. Figure 3 is a diagram of the third embodiment of the present invention shown corresponding to Figure 1 (a), b) is a bb arrow view of France), Fig. 4 is a view of the fourth embodiment of the present invention shown corresponding to Fig. 1(a), and Fig. 5 is a view corresponding to Fig. 1(b). FIG. 6 is a diagram of the sixth embodiment of the present invention shown correspondingly to FIG. 1(b), and FIG. 7 is a diagram of the third embodiment of the present invention shown correspondingly to FIG. FIG. 8 is a side view of a conventional example, and FIG. 9 is a side view of another conventional example. 1... Vibrating body, 2... Slider, 3...
beam. 4...Ball screw, 4a...Screw shaft, 4b
...Natsuto club. 5...Bearing, 6...Motor, 7...
gear. 8... Connecting shaft, 9... Slide jig. 10... Universal Ji 1 India 911... Guide. 12...Metal fittings, 13...Safety device, 14...Slide guide. 15...Rail, 16...Speed up gear (or speed reducer). 17...Torque limiter, 18...Ball, 19
···base. 4. Slide part.

Claims (1)

[Claims] A vibrating body is held horizontally movable with respect to the structure to be damped, and a nut is provided on the vibrating body side, and a screw shaft that is screwed into the nut is provided on the structure side, and the height difference between them in the horizontal direction is provided. 1. A vibration damping device comprising: a plurality of ball screws that are perpendicular to each other; and a motor that rotates the ball screws and moves the vibrating body back and forth in accordance with the vibration cycle of the structure.