JP2670179B2 - Pendulum damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is applied to the suppression of vibration of structures such as buildings, steel structures and machines due to external forces caused by wind, earthquakes, traffic, etc. The present invention relates to a pendulum type vibration damping device.

[Conventional technology]

As shown in FIG. 6, the conventional pendulum type vibration damping device has an outer frame.
A mass vibrating body 03 is hung from 01 by a plurality of ropes or wires 02, and a damping element (a shock absorber 04) and a spring 06 are horizontally mounted between both side surfaces of the mass vibrating body 03 and the outer frame 01. Has been.

[Problems to be solved by the invention]

In the above-mentioned conventional pendulum type vibration damping device, since the damping element is attached to the side surface of the mass vibrating body having a large amplitude, the space occupied by the damping element is the dimension of the mass vibrating body, its amplitude,
An outer frame having a width equal to or longer than the self-length of the damping element and its stroke is required, and a large occupied area is required on the floor surface.

The present invention is intended to solve the above problems of the conventional vibration damping device.

[Means for solving the problem]

The pendulum type vibration damping device of the present invention restrains the movement of a mass vibrating body suspended from a structure to be damped, the mass vibrating body being in a state in which the weight of the mass vibrating body is not applied. Without the both ends connected to the mass vibrating body and the structure without being arranged vertically, and a spring and a damping that are connected to the mass vibrating body at an intermediate portion of the rod and arranged substantially horizontally. Composed of elements.

[Action]

In the present invention, when the mass vibrating body vibrates, the rod having one end connected to the structure and the other end connected to the mass structure tilts with respect to the vertical direction at an angle corresponding to the displacement of the mass vibrating body. Due to the inclination of the rod with respect to the vertical direction, the intermediate portion of the rod causes relative displacement in the horizontal direction with respect to the mass vibrating body. Since the intermediate portion of the rod that causes relative displacement in the horizontal direction with respect to the mass oscillator is connected in a mass oscillation manner by a spring and a damping element arranged in a substantially horizontal direction, a damping effect is produced. Therefore, unlike the conventional vibration damping device, the outer frame is not required, and the installation space for the outer frame becomes unnecessary.

Further, since the weight of the spring and the damping device itself also acts as a part of the mass vibrating body, the weight of the mass vibrating body for producing the same damping effect is reduced.

Further, since the spring is used together with the damping element, it is possible to apply the structure to structures having different natural vibrations by changing the rigidity of the spring.

Furthermore, the movement locus of the mass vibrating body in the present invention is linear, and it is possible to apply the active type vibration damping device or the like according to Japanese Patent Application No. 1-270203 filed previously by the present applicant. In this case, the drive part of the active type vibration damping device is advantageous because it can be installed in the lower portion of the mass vibrating body of the present invention, which does not have a space limitation.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

3 is a rectangular parallelepiped mass vibrating body having an approximately square horizontal cross section with an edge 3 ′ projecting upward in the center of each side thereof,
The structure is suspended by a ceiling beam 7 of a structure that is symmetrical in terms of damping with four wires or ropes 2 attached to the lower four corners of the mass vibrating body 3. The upper end of the rod 5 arranged vertically is connected to the joint 7a of the ceiling beam, and the lower end of the rod 5 is connected to the joint 3a on the upper surface of the mass vibrating body 3. The joint 7a has a structure such as a spherical bearing, and is configured so that the rod 5 can rotate in all directions without resistance. Further, as shown in FIG. 2, a spherical surface portion 5b is provided at the lower end of the rod 5, and the spherical surface portion 5b is fitted in the spherical concave portion 3a 'of the spherical seat 3a attached to the central upper surface of the mass vibrating body 3. Together, the rod 5 can rotate relative to the mass vibrating body 3 in all directions without resistance. Moreover, the mass vibrating body 3 is suspended by the wire or the rope 2, and its own weight is supported, so that the rod 5 is not loaded with its own weight.

In the middle part of the rod 5, as shown in FIG. 3, two sets each consisting of a spherical seat 5a having four spherical recesses 5a 'are provided at a slight interval vertically. Corresponding to the above, the spherical seat is provided at the center of each side of the edge 3'of the mass vibrating body 3.
A set of four spherical seats 3b having a structure similar to that of 5a is provided at a slight interval vertically. Four damping elements 4 and springs 6 arranged substantially horizontally and orthogonal to each other are provided between the spherical seats 5a and 3b facing each other, and spherical portions at both ends thereof are provided. (FIG. 3 shows the spherical elements 4a, 6a of the damping element 4 and the spring 6 on the side of the spherical seat 5a) are fitted in the spherical recesses of the spherical seats 5a, 3b. Further, 8 is a period adjusting device which is provided on each side surface of the mass vibrating body 3 and whose position can be adjusted up and down. The wire or rope 2 penetrates the same period adjusting device, and the position of the period adjusting device 8 is adjusted. By adjusting, the suspension length of the wire or the rope 2 can be adjusted, and the frequency of the mass vibrating body 3 can be adjusted.

In the present embodiment, by adjusting the position of the period adjusting device 8 upward, the suspension length of the wire or rope 2 that supports the own weight of the mass vibrating body 3 is adjusted, and the frequency of the mass vibrating body 3 is adjusted appropriately. Adjusted to.

In this embodiment, a state in which the mass vibrating body 3 moves relative to the structure 7 is schematically shown in FIG.
The spring 6 is omitted in the figure for simplicity).
When the mass vibrating body 3 moves to the left side in FIG. 5, as shown by the solid line, for example, the rod 5 moves to the joint 7a.
Swing around. At this time, the rod 5
Since the joint 3a at the lower end of the rod 3 is connected by the spherical surface portion 5b, the lower end of the joint 3a moves smoothly in accordance with the movement of the mass vibrating body 3 and is inclined with respect to the vertical direction. The damping element 4 and the spring 6 arranged between the portion and the edge portion 3 ′ of the mass vibrating body 3 also move substantially horizontally in accordance with the swing of the mass vibrating body 3 and the rod 5. At this time, since the joint 5a of the damping element 4 (spring 6) is provided in the middle portion of the rod 5, as shown by the solid line in FIG. 5, the distance between the spherical seats 3b, 5a on the left side is the right side. Is larger than the distance between the spherical seats 3b, 5a, the left spherical seat 5a is relatively farther than the left spherical seat 3b, while the right spherical seat 5a is relatively closer to the right spherical seat 3b. . Therefore, the damping element 4 and the spring 6 on the left side expand, and the damping element 4 and the spring 6 on the right side contract, so that the vibration damping effect is exhibited. As described above, in the present embodiment, the damping element 4 that is opposed by the vibration of the mass vibrating body 3 is used.
By relatively displacing one of the spring 6 and the spring 6 and contracting the other, a desired vibration damping effect can be obtained.

In addition, the frequency of the mass vibrating body 3 can be adjusted by adjusting the position of the period adjusting device 8 and the rigidity of the spring 6, and the structure having different natural frequencies in the direction orthogonal to the horizontal plane. The present embodiment can be applied to.

Further, in this embodiment, since the damping element 4 and the spring 6 are connected to the mass vibrating body 3, and the weight thereof acts as a part of the mass vibrating body 3, the mass vibration for producing the same damping effect is obtained. The weight of the body 3 can be reduced.

Furthermore, this embodiment does not require an outer frame unlike the conventional vibration damping device, and since the damping element 4 and the spring 6 are housed between the edge portions 3 ′ of the mass vibrating body 3. , The installation space can be significantly reduced.

〔The invention's effect〕

As described above, in the present invention, by disposing the spring and the damping element between the mass vibrating body and the rod connected to the mass vibrating body, the vibration damping device does not require an outer frame unlike the conventional vibration damping device. The occupying area can be reduced.

Further, the weight of the spring and the damping element connected to the mass oscillator acts as a part of the weight of the mass oscillator,
The mass vibrating body can be made lighter by that amount, and the size can be reduced to reduce the area occupied by the vibration damping device.

Furthermore, by changing the rigidity of the spring, it can be applied to structures having different natural frequencies.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a sectional view of a connecting portion between a rod and a mass vibrating body of the embodiment, FIG. 3 (a),
(B) is an elevation view and a plan view of the connecting portion between the damping device (spring) and the rod of the same embodiment, FIG. 4 is a plan view of the same embodiment, and FIG. 5 is a schematic diagram showing the operation of the same embodiment. 6 and 6 are explanatory views of a conventional vibration damping device. 2 ... Wire or rope, 3 ... Mass vibrator, 3 '... Edge of mass vibrator, 3a, 3b ... Spherical seat, 4 ... Damping element, 5 ... Rod, 5a ... Spherical seat, 6 …… Spring, 7 …… Structure ceiling beam, 7a …… Joint

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazumi Tamura, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Prefecture, Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Manabu Fujishiro 4 Kannon-shin, Nishi-ku, Hiroshima-shi, Hiroshima 6-22 No. 6 Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. (56) References

Claims (1)

(57) [Claims] 1. A mass vibrating body suspended from a structure to be damped, the mass vibrating body in a state where the weight of the mass vibrating body is not applied, and without restraining the movement of the mass vibrating body. The structure is composed of a rod which is connected at both ends to the structure and is arranged vertically, and a spring and a damping element which are connected to an intermediate portion of the rod and the mass vibrating body and are arranged substantially horizontally. Pendulum type vibration control device.