JPH0771518A - Vibration damping device - Google Patents

Abstract

PURPOSE:To take out the motion of a weight in an X-Y plane in the direction of X-axis and in the direction of Y-axis individually and independently at the time of absorbing the vibration of a large structure in two dimensions by installing a spring element, a damper element and a driving mechanism for the independently taken-out motion. CONSTITUTION:When a weight (m) is moved in the direction of X-axis, pulleys 3, 8 are mutually reversed, and rollers 9, 10 are moved to follow the movement of the weight (m) by tension of a wire 11 (point A on wire 11 is immobile). Subsequently, when the weight (m) is moved in the direction of Y-axis, the distance between the pulley 3 and the pulleys 1, 2 is shortened, and the distance between the pulley 8 and the pulleys 6, 7 is increased for that, so that the wire 11 left over on the pulleys 1-3 is used by the pulleys 6-8, and the point A on the wire 11 is also moved (the travel of the point A= twice the travel of weight (m)). Thus, a movable frame 16 is installed on the point A on the wire 11, and a damper element 17, a spring element 18 and a driving device 19 at the time of active vibration damping are installed on the frame 16 to form a vibration damping device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vibration control device for large structures,
In particular, the present invention relates to a vibration damping device that absorbs two-dimensional vibration.

[0002]

2. Description of the Related Art In the case of a two-dimensional vibration damping device, the weight of the vibration damping device moves in two dimensions (XY plane). Therefore, there are springs for the X axis and for the Y axis. As shown in FIG. 3, when the weight m moves ΔX in the X-axis direction, the spring a in the X-axis direction is considered.
And the axis is aligned straight to b and a force is applied. However, the springs c and d in the Y-axis direction move so as to be oscillated to the right, and a force in the X-axis direction component is generated. Since the magnitude of this force changes depending on the amplitude, the movement of the weight m is non-linear. Similar thing Y
Since it also occurs in the axial movement, it was not easy to change or adjust the resonance frequency of each axis independently.

[0003]

In absorbing the two-dimensional vibration of a large structure, the movement of the weight in the XY plane can be independently taken out separately in the X-axis direction and the Y-axis direction. To do so. Thus, by mounting the spring element, the damper element, and the drive mechanism for the independently taken out movement,
It is an object of the present invention to realize a vibration damping device having two-dimensional independent resonance frequencies.

[0004]

Means for Solving the Problems A pair of pulleys 3 and 8 provided symmetrically on the weight m with respect to the X axis passing through the center of the weight m.
And a pair supported symmetrically outside the weight m with respect to the X axis passing through the center of the weight m and supported by a pair of pulley support frames 12 and 13 movable in the X axis direction. PRIORIES 1 and 2, 6
And 7, a pair of pulleys 4 and 5 which are supported by the case of the vibration damping device and are symmetrical with respect to the X axis passing through the center of the weight m, and both ends fixed to the case. One pulley 1 on one pulley supporting frame 12 to a pulley 3 on the weight m, the other pulley 2 on the supporting frame 12 again, and two pulleys supported on the case. After the pulleys 4 and 5, the pulley support frame 13 on the opposite side
A wire 11 stretched from one pulley 6 to the other pulley 8 on the weight m, and further through the other pulley 7 of the pulley support frame 13 and the wire 11. A vibration take-out mechanism in the Y-axis direction and a vibration take-out mechanism in the X-axis direction having the same structure as the vibration take-out mechanism in the Y-axis direction.
Vibrations in the axis and Y-axis directions can be independently extracted.

[0005]

When the weight m moves in the X-axis direction, since the wire 11 is taut, the pulley 3 turns clockwise and the pulley 8 turns counterclockwise. Pulley 3 due to the tension of wire 11
And 8 are pulled in opposite directions, and the forces are received by the rollers 9 and 10. Therefore, the rollers 9 and 10 move as the weight m moves. At this time, the length of the wire 11 delivered from the pulley 2 and the length of the wire emitted from the pulley 6 are equal, and this is also equal to the movement of the weight m. Therefore, the point A on the wire 11 is immobile. That is, there is no sensitivity to movement in the X-axis direction.

When the weight m moves in the Y-axis direction, the distance between the pulley 3 and the pulleys 1 and 2 becomes short. The distance between the pulley 8 and the pulleys 6 and 7 is increased by the same amount. For this reason, the wire 11, which was the pulley on the pulleys 1, 2 and 3 side, is
The wire 11 is not loosened because it is used on the sides 6, 7, and 8. At this time, the wire 11 is pulled from the pulley 4 side to the pulley 5 side.
Since it moves to the side, the point A on the wire 11 also moves. Since the pulleys 3 and 8 are moving pulleys, the movement amount of the point A is twice as much as the movement of the weight m. In this way, the point A on the wire 11 moves twice as much as the movement of the weight m in the Y direction, and has no sensitivity to the movement in the X axis direction. That is, this mechanism can take out only the movement in the Y direction of the movement of the weight m in the XY plane.

[0007]

EXAMPLE An explanation will be given based on FIG. In FIG. 1, reference numerals 1 to 8 are pulleys, and one wire 11 is symmetrically wound around the weight m. Reference numerals 12 and 13 denote T-shaped pulley supporting frames, and a roller and a pulley are rotatably supported at each end of the supporting frame. That is, the pulleys 1 and 2 and the roller 9 are supported on the support frame 12, and the pulleys 6 and 7 and the roller 10 are supported on the support frame 13, respectively. The pulleys 3 and 8 are on the weight m and are supported symmetrically with respect to the X axis passing through the center of the weight m. Further, the pulleys 4 and 5 are supported by the case of the vibration damping device, and are attached symmetrically with respect to the X axis passing through the center of the weight m. Rollers 9 and 10 are rails 14 and 1 parallel to the X axis.
5 are rotatably supported on each of them.

Both ends of the wire 11 are fixed to the case of the vibration damping device, and are wound around the pulleys 1 → 3 → 2 → 4 → 5 → 6 → 8 → 7 without looseness. This mechanism is a mechanism for extracting movement in the Y-axis direction, but a mechanism that is rotated by 90 ° by the same mechanism is attached so that movement in the X-axis direction can be extracted.

Next, the operation will be described. When the weight m moves in the X-axis direction (see the chain double-dashed line in FIG. 1). Since the wire 11 is taut, the pulley 3 turns clockwise and the pulley 8 turns counterclockwise. Due to the tension of the wire 11, the pulleys 3 and 8 are pulled to the opposite sides, and the force is received by the rollers 9 and 10. Therefore, the rollers 9 and 10 move as the weight m moves. At this time, the length of the wire 11 delivered from the pulley 2 and the length of the wire emitted from the pulley 6 are equal, and this is also equal to the movement of the weight m. Therefore, the point A on the wire 11 is immobile. That is, there is no sensitivity to movement in the X-axis direction.

When the weight m moves in the Y-axis direction. When the weight m moves in the Y-axis direction, the distance between the pulley 3 and the pulleys 1 and 2 becomes short. In addition, the same amount as the pull 8 and pull
The distance between 6 and 7 becomes longer. For this reason,
Since the wire 11 which has been the pulley on the side is used on the pulleys 6, 7, and 8 side, the wire 11 is not loosened. At this time, since the wire 11 moves from the pulley 4 side to the pulley 5 side, the point A on the wire 11 also moves. Since the pulleys 3 and 8 are moving pulleys, the movement amount of the point A is twice as much as the movement of the weight m. Thus, the point A of the wire 11 is the weight m.
It has twice the movement in the Y direction and has no sensitivity to the movement in the X axis direction. That is, this mechanism takes out only the movement in the Y direction of the movement of the weight m in the XY plane.

FIG. 2 shows a vibration damping device for forcibly absorbing the motion thus taken out, and at a point A on the wire 11, a frame 16 movable on the case is attached. A damper element 17, a spring element 18 and a drive device 19 for active vibration damping are mounted on the frame 16.

[0012]

[Effect] A pair of pulleys 3 and 8 symmetrically provided on the weight m with respect to the X axis passing through the center of the weight m, and the weight m with respect to the X axis passing through the center of the weight m. , And a pair of pulleys 1 and 2 and 6 and 7 supported by a pair of pulley support frames 12 and 13 which are symmetrically provided outside the frame and which are movable in the X-axis direction. A pair of pulleys 4 and 5 provided symmetrically with respect to the X axis passing through the center of the weight m supported by the case, and both ends fixed to the case, one pulley supporting frame. 12 from one pulley 1 to a pulley 3 on the weight m, the other pulley 2 of the pulley supporting frame 12 again, and two pulleys 4 supported by a case. And 5, and one pulley of the pulley support frame 13 on the opposite side
A wire 11 stretched from the pulley 6 to the other pulley 8 on the weight m via another pulley 7 of the pulley supporting frame 13.
And a vibration absorbing mechanism in the Y-axis direction composed of a vibration absorbing mechanism connected to the wire 11, and a vibration extracting mechanism in the X-axis direction having the same structure as the vibration extracting mechanism in the Y-axis direction. Axial vibration can be taken out separately for each.

As described above, the structure is such that there is no movement in the Y-axis direction with respect to the movement in the X-axis direction, and conversely, there is no movement in the X-axis direction with respect to the movement in the Y-axis direction. axis,
The movement can be taken out independently in the Y-axis direction,
By installing a vibration absorbing mechanism in each direction, X, Y
A vibration damping device having independent resonance frequencies on both axes can be obtained.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a view in which a vibration absorbing mechanism is attached to the vibration extracting mechanism of FIG.

FIG. 3 is a principle diagram of a known secondary damping mechanism.

[Explanation of symbols]

 1-8 Pulley 9,10 Roller 11 Wire 12,13 Support frame 14,15 Rail 16 Frame 17 Damper element 18 Spring element 19 Drive device

Claims (1)

[Claims] 1. A weight for the X axis passing through the center of the weight (m)
A pair of pulleys (3 and 8) symmetrically provided on (m) and symmetrically provided outside the weight (m) with respect to the X axis passing through the center of the weight (m). , A pair of pulleys (1 and 2, 6 and 7) supported by a pair of pulley support frames (12 and 13) movable in the X-axis direction, and a case of the vibration damping device. A pair of pulleys (4 and 5) provided symmetrically with respect to the X axis passing through the center of the supported weight (m).
Both ends are fixed to the case, and one pulley support frame
From one pulley (1) of (12) to the pulley (3) on the weight (m),
Again through the other pulley (2) of the pulley supporting frame (12) and the two pulleys (4 and 5) supported by the case, further pulley supporting on the opposite side. From one pulley (6) of the frame (13) to the weight
(m) on the other pulley (8) on the wire (11) stretched via the other pulley (7) of the pulley supporting frame (13) and the wire (11). A vibration take-out mechanism in the Y-axis direction including a connected vibration absorbing mechanism, and an X having the same structure as the vibration take-out mechanism in the Y-axis direction.
A vibration damping device consisting of a combination of axial vibration extraction mechanisms that can independently extract X-axis and Y-axis vibrations.