JPH04119235A - Pendulum type damping device for long period structure - Google Patents

Abstract

PURPOSE:To carry out a long period damping without lengthening pendulum hanging members by joining both edges of the plural hanging members to a weight support plate and an upper support part, arranging freely movable rollers on the weight support plate and under the upper support part so as to arrange the hanging members in a reciprocating condition through the rollers. CONSTITUTION:A weight 4 is loaded on a weight support plate 10, and is hanged from an upper support part 1 by means of plural hanging members 3. Both edges of the hanging members 3 are joined to the upper support part 1 and the weight support plate 10 with pins 2a and 2b. The hanging members are arranged in a reciprocating condition through rollers 11 and 12 so as to be movable between the middle parts of the hanging members 3 in the right and left directions. Owing to movements of the rollers, their behaviors accompanied by deformation of the weight 4 can be made equal to a case when the weight is hanged by means of the length of three times as long as that of the hanging materials from the pin 2a to the pin 2b so that it can be used as a long period damping device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pendulum-type vibration damping device for suppressing vibrations of structures caused by wind or the like.

[Prior Art] Figure 5 is a block diagram of a conventional pendulum vibration damping device.
) is the upper support part, (2) is the pin, (3) is the pendulum hanging material, (
4) is a weight, (4a) is its center of gravity, and (5) is a damper.

The pendulum type vibration damping device is constructed by suspending a weight (4) from an upper support portion (1) by connecting a pin (2).

If the length from the pin (2) to the center of gravity (4a) of the weight (4) is L, if the period of the structure to be damped is T seconds, then L
is given by the following equation.

22 g; Gravitational acceleration Figure 6 is a configuration diagram of a multi-stage pendulum type vibration damping device described in Kajima Corporation No. 2-30858 and the Mitsubishi Heavy Industries catalog, and (1) to (5) in the figure are as described above. The same or equivalent parts as the device shown in FIG. 5, (6a), (6b), . . . are frames, and (7) is a weight support.

As shown in the figure, the weight support stand (7) on which the weight (4) is placed
), hanging materials (3a) to (3n) and frames (8a) to
(8n) are suspended in multiple stages.

[Problems to be Solved by the Invention] Among the conventional pendulum type vibration damping devices described above, in the damping device shown in FIG. becomes longer and its fruiting equipment becomes larger, requiring too much space for the equipment. By the way, when the period is 6 seconds, L is 8.9 m, and when the period is 7 seconds, L is 8.9 m.
is 12.2m.

The multi-stage pendulum damping device shown in FIG. 6 was designed to eliminate the need for such an excessively large space. In this case, the necessary hanging material length is ensured by the sum of the lengths of the first hanging material (3a) to the nth hanging material (3n), so the size of the entire vibration damping device does not become so large. However, the first frame (6a) to the (n −1)th frame (6n
) is required, and an inter-frame damper (5a) is required to suppress vibration of the frame, making the mechanism complicated and the vibration characteristics accordingly complicated.

The present invention was made to solve the above-mentioned problems of the conventional pendulum-type vibration damping device, and aims to provide a pendulum-type vibration damping device for long-period structures that has a simple mechanism but has a high damping effect. It is something.

[Means for Solving the Problems] In order to achieve the above object, the pendulum type vibration damping device according to the present invention includes a weight support base (10) on which a weight (4) is placed, as shown in FIG. ) is suspended from the upper support part (1),
One end of each of the plurality of hanging materials (3) for suspending the weight support base (10) is attached to the upper support part (1), and the other end is attached to the weight support base (10) on which the weight is placed. At the same time, a roller (11) movable from side to side is provided on the weight support base (10) at the middle of the hanging material (3), and a roller (12) movable from side to side is provided on the upper support portion (1). It is configured by reciprocating through the

[Operation] In the pendulum-type vibration damping device configured as described above, the intermediate rollers (11) and (12) of the pendulum hanging member (3) when stationary.
) is the upper support bottle (2a) and the weight support bottle (2a).
2b) to maintain the overall balance by moving to a position that equally divides the horizontal distance with 2b).

Further, when the structure vibrates, the weight (4) moves to cancel out the vibration of the structure. That is, as shown in FIG. 4, when the weight (4) moves by 6, the intermediate rollers (11) and (12) of the pendulum hanging material move toward the bottle (2a) of the upper support part.
As a result, the hanging material (3a) that connects the bin (2b) of the weight support stand and the upper support roller (12) is moved to a position that equally divides the horizontal distance between the bin (2b) of the weight support stand The inclination of is smaller than when the roller part does not move. That is, in FIG. 4, the behavior is the same as when three times the total length of the pendulum hanging member is vertically suspended from the bottle (2a) of the upper support part 1 to the bottle (2b) of the weight support base. Therefore, a long period can be achieved without increasing the length of the pendulum hanging material.

[Embodiments of the Invention] Fig. 1 is a configuration diagram of a pendulum type vibration damping device showing an embodiment of the present invention, Fig. 2 is a side view of the hanging material length adjustment device, and Fig. 3 is an enlarged view of the roller part. It is.

As already explained, the pendulum vibration damping device according to the present invention has the following features:
A connecting weight (4) is placed on a weight support part (10), and the weight support part (10) is suspended by a plurality of hanging members (3). However, when hanging with hanging materials (3),
One end of each of the plurality of hanging members (3) is attached to the upper support part (1
), the other end is joined to the weight support stand (10) on which the weight is placed, and the middle of the hanging material (3) is attached to the weight support stand (10).
A roller (11) provided on the upper support portion (1) that is movable left and right and a roller (12) that is movable left and right provided on the upper support portion (1).
It is configured by reciprocating through the .

As a result, the behavior associated with the deformation of the weight (4) is
) is the same as if it were to fall straight downward. In other words, the restoring force of the pendulum is reduced, making it possible to provide a pendulum-type vibration damping device for long-period structures.

Figure 2 is an enlarged view showing the connection between the hanging material (3) and the roller (11).The hanging material (3) is attached to the pulley (13) so that the roller (11) can smoothly move to a predetermined balanced position. It is attached through.

Note that the roller (11) may be configured to be movable in the left and right directions in the figure as shown in FIG. 1, but as shown in FIG.
The rollers (lla) and (llb) may be combined in two stages so that they can move not only left and right but also in a direction perpendicular to the plane of the paper.

[Effects of the Invention] The present invention provides a pendulum-type vibration damping device in which a weight supporter on which a weight is placed is suspended from an upper support portion by a plurality of hanging members, in which a weight supporter (lO) One end of each of the multiple hanging materials used to suspend the material was connected to the upper support part, the other end was connected with a pin to the weight support base on which the weight was placed, and the middle of the hanging materials was provided on the weight support base. Since it is constructed by reciprocating through a roller that is movable from side to side and a roller that is movable from side to side provided on the upper support part, the length of the pendulum hanging material is not increased.
We were able to obtain a pendulum-type vibration damping device for long-period structures.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a pendulum-type vibration damping device for a long-period structure, which is an embodiment of the present invention, and Fig. 2 shows a hanging member (3) and a roller (11).
), Fig. 3 is an enlarged view of the roller section, Fig. 4 is an explanatory diagram of the operation of the allocation device, Fig. 5 is a configuration diagram of a conventional pendulum vibration damping device, and Fig. 6 is FIG. 1 is a configuration diagram of a conventional multi-stage pendulum damping device. In the figure, (1) is the upper support part, (2) is the pin, (3) is the hanging material, (4) is the weight, (5) is the damper, (10) is the weight support, (11), (12) is a roller, and (13) is a pulley. Agent: Patent Attorney Muneharu Sasaki ('jJ rQ'LOONrr)

Claims (3)

[Claims] (1) In a pendulum type vibration damping device in which a weight support base on which a weight is placed is suspended from an upper support part by hanging members, each of the plurality of hanging members suspending the weight support base. One end is pin-jointed to the upper support part and the other end to the weight support base, and the middle of the hanging material is connected via a movable roller provided on the weight support base and a movable roller provided on the upper support part. A pendulum-type vibration damping device for a long-period structure, characterized in that it is configured in a reciprocating arrangement. (2) Claim (1) characterized in that the pin connection of the hanging material to the upper support part and the weight support base is by a universal joint, and the rollers are arranged in two stages in two orthogonal directions. A pendulum-type vibration damping device for a long-period structure described in . (3) The pendulum-type vibration damping device for a long-period structure according to claim (1), wherein the hanging material is attached to the roller via a pulley.