JP6426928B2 - Vibration control device - Google Patents

Description

  The present invention relates to a damping device for a structure.

  Patent Document 1 discloses a TMD (Tuned Mass Damper) type vibration damping device in which a mass is suspended by a pair of left and right arms attached to a base frame of a structure.

  In the above-described vibration damping device, by attaching a spring mechanism between the pair of arms, it is possible to reduce vibrations in two orthogonal directions which have different natural periods in the structure.

JP 2012-255460 A

  However, in the above-described vibration damping device, the length of the arm that suspends the mass is determined by the natural period on the long cycle side of the structure, so there is a problem that the vibration damping device becomes large.

  The present invention has been made in view of the above problems, and an object of the present invention is to suppress the size of a vibration control device capable of reducing vibration in two orthogonal directions in a structure having different natural periods.

  The present invention vibrates in the first vibration direction at the first natural period when vibration is applied from the outside, and has a longer period than the first natural period in the second vibration direction orthogonal to the first vibration direction. A vibration damping device for reducing the vibration of a structure vibrating in a second natural cycle, the main mass being swingably suspended from the top of a frame by a suspending member, and parallel movement in the first vibration direction A support that is coupled to the bottom of the frame or to the structure at one end, and a secondary mass that is attached to the other end of the support, and that is pivotable in the second vibration direction. When the main mass swings in the first vibration direction, the support and the sub-mass move in parallel in synchronization with the swing of the main mass, and the main mass swings in the second vibration direction When the support and the sub-mass rotate in synchronization with the swing of the main mass , And a link mechanism for connecting to the main mass and said support.

  According to the present invention, when the structure vibrates, in the first vibration direction, the support and the sub-mass move in parallel in synchronization with the swing of the main mass by the link mechanism. In addition, in the second vibration direction, the support and the sub-mass rotate in synchronization with the swing of the main mass by the link mechanism. In the first vibration direction, since the main mass and the sub mass vibrate together, the natural period of the main mass and the sub mass is determined by the length of the suspension member that suspends the main mass. In the second vibration direction, the secondary mass vibrates in phase with the main mass as an inverted pendulum, and the inertia force of the secondary mass acts on the main mass through the link mechanism, so the natural periods of the main mass and the secondary mass are The cycle is longer than the natural cycle in the first vibration direction. Therefore, while making it possible to reduce vibrations in two orthogonal directions in a structure having different natural periods, the length of the suspension member for suspending the main mass can be made a length corresponding to the first natural period which is a short period, The size of the damping device can be suppressed.

It is a front view of a damping device concerning an embodiment of the present invention. It is a right side view of a damping device concerning an embodiment of the present invention. It is a top view of the damping device concerning the modification of the present invention.

  Hereinafter, the damping device 100 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The damping device 100 is a TMD (Tuned Mass Damper) type damping device installed in a structure to reduce the vibration of the structure. Specifically, damping device 100 is installed, for example, on the top floor or the rooftop of a high-rise building. In addition, the position which installs the damping device 100 is not limited to the high position of a structure, For example, you may install in the middle floor of a high-rise building etc., and the installation position of the damping device 100 changes suitably It is possible.

  The structure vibrates in the first vibration direction with the first natural period when vibration is applied from the outside by an earthquake, strong wind or the like, and is greater than the first natural period in the second vibration direction orthogonal to the first vibration direction. It vibrates at the second natural cycle of the long cycle.

  The vibration damping device 100 is installed on a structure with the X direction shown in FIGS. 1 and 2 as the first vibration direction and the Y direction as the second vibration direction.

  The damping device 100 includes a main mass 3 suspended from the top plate 1 a of the frame 1 by the rectangular frame 1 and four suspension arms 2 as suspension members, and a bottom plate 1 b of the frame 1. A support arm 4 as a support to which the lower end is connected, a sub mass 5 attached to the upper end of the support arm 4, and a link mechanism 6 connecting the main mass 3 and the support arm 4.

  The frame 1 is configured by connecting a top plate 1a and a bottom plate 1b by four columns 1c. The damping device 100 is installed integrally with the structure by fixing the frame 1 to the horizontal floor surface of the structure.

  The upper ends of the four hanging arms 2 are connected to a universal joint 7 attached to the top plate 1 a of the frame 1. The lower end of the hanging arm 2 is connected to a universal joint 8 attached to the main mass 3. Thereby, the main mass 3 becomes a parallel pendulum swingable in all directions.

  The lengths of the four hanging arms 2 are set to correspond to the first natural period of the structure. This will be described later.

  When the damping device 100 is installed in a high-rise building, the main mass 3 is, for example, from several tens of tons to one hundred tons or more. The main mass 3 is, for example, a number of stacked iron plates, reinforced concrete, a tank filled with liquid, or the like.

  The support arm 4 is inserted through a through hole 3 a provided in the central portion of the main mass 3.

  The lower end of the support arm 4 is connected to the bottom plate 1 b of the frame 1 so as to be movable in parallel in the X direction and rotatable in the Y direction. Specifically, in the present embodiment, the linear motion bearing 9 is fixed to the bottom plate 1b of the frame 1 in a direction capable of linear motion in the X direction, and the linear motion bearing 9 is rotated in alignment with the axial direction in the X direction. The moving shaft 10 is fixed. The lower end of the support arm 4 is connected to the pivot shaft 10.

  The secondary mass 5 is, for example, a mass of several tens of tons, and is a mass smaller than the primary mass 3. Similar to the main mass 3, the sub-mass 5 is composed of a large number of stacked iron plates and the like.

  The link mechanism 6 has a pair of rollers 11 provided on the support arm 4, a pair of brackets 12 provided on the main mass 3, and a pair of bearings 13 provided respectively on the pair of brackets 12.

  As shown in FIG. 1, the pair of rollers 11 is provided on both sides of the support arm 4 with the axial direction of the support shaft 11 a aligned with the X direction.

  The pair of brackets 12 is provided on both sides of the support arm 4 in the X direction. The bracket 12 has a pair of side wall portions 12 a provided close to the roller 11 as shown in FIG.

  Thereby, when the main mass 3 swings in the Y direction, the side wall portion 12a of the bracket 12 and the roller 11 abut, and in synchronization with the swinging of the main mass 3, the support arm 4 takes the pivot shaft 10 as a fulcrum. Rotate. That is, the sub mass 5 attached to the upper end of the support arm 4 vibrates in the Y direction in the same phase as the main mass 3 as an inverted pendulum.

  When the main mass 3 is stationary, the side wall 12 a of the bracket 12 prevents the support arm 4 from falling down via the roller 11. That is, the support arm 4 is in an upright state.

  When the main mass 3 and the support arm 4 vibrate in the Y direction, relative displacement in the vertical direction occurs between the main mass 3 and the support arm 4. On the other hand, in the present embodiment, the main mass 3 and the support arm 4 are connected via the roller 11. According to this, since the roller 11 rotates following the relative displacement in the vertical direction generated between the main mass 3 and the support arm 4, the operation of the main mass 3 and the support arm 4 in the Y direction is hindered. Instead, the vibrations of the main mass 3 and the support arm 4 can be synchronized.

  The bearing 13 is a steel ball rotatably held by the case. The bearing 13 is provided on the surface of the bracket 12 on the side of the support arm 4 in proximity to the support arm 4.

  Thereby, when the main mass 3 swings in the X direction, the bearing 13 presses the side surface of the support arm 4 and the support arm 4 moves in parallel in synchronization with the swing of the main mass 3. That is, the sub mass 5 attached to the upper end of the support arm 4 vibrates in the X direction integrally with the main mass 3.

  As mentioned above, the bearing 13 is a rollable steel ball. Therefore, even if the bearing 13 contacts the support arm 4 when the main mass 3 and the sub mass 5 vibrate in the Y direction, the rolling of the bearing 13 causes the main mass 3 and the support arm 4 in the Y direction. The operation is not blocked.

  As the position at which the bearing 13 presses the support arm 4 is closer to the lower end of the support arm 4, the moment applied to the support arm 4 can be reduced, and the durability of the support arm 4, the linear motion bearing 9, and the rotation shaft 10 can be improved. It can be improved. Therefore, for example, the bearing 13 may be provided on the lower surface side of the main mass 3 to press the vicinity of the lower end of the support arm 4.

  Then, the effect by configuring the damping device 100 as described above will be described.

  When the structure vibrates due to an earthquake, strong wind or the like, the damping device 100 vibrates integrally with the structure. Thereby, the main mass 3 and the sub mass 5 connected via the link mechanism 6 vibrate in synchronization.

  When the structure vibrates, the main mass 3 and the sub mass 5 start to vibrate late after the structure starts vibrating due to inertia. For this reason, the vibration of the structure and the vibration of the main mass 3 and the secondary mass 5 are out of phase by about 90 degrees.

  The vibration of the main mass 3 and the sub mass 5 can be decomposed into vibration in the X direction and vibration in the Y direction. The following description is divided into the X direction and the Y direction.

  In the X direction, the main mass 3 and the sub mass 5 vibrate together. The natural period of the main mass 3 and the secondary mass 5 in this case is determined by the length of the hanging arm 2 that suspends the main mass 3.

  In the present embodiment, the lengths of the four hanging arms 2 are set to correspond to the first natural period of the structure, that is, the natural period on the short period side. As a result, the structure and the main mass 3 and the sub mass 5 are vibrated in the same cycle with a phase shift of about 90 degrees, and the vibration in the first vibration direction of the structure is reduced.

  In the Y direction, the secondary mass 5 vibrates in the same phase as the primary mass 3 as an inverted pendulum. At this time, since the inertia force of the submass 5 acts on the main mass 3 via the link mechanism 6, a force that the submass 5 tends to fall acts on the main mass 3, and as a result, the restoring force of the main mass 3 Is reduced. Therefore, the specific period in the Y direction of the main mass 3 and the sub mass 5 is longer than the specific period in the X direction in which the main mass 3 and the sub mass 5 vibrate together.

  As the inertial force of the secondary mass 5 acting on the main mass 3 is larger, the natural period of the primary mass 3 and the secondary mass 5 in the Y direction becomes longer. The inertial force of the submass 5 acting on the main mass 3 is adjusted by the mass of the submass 5 which is an inverted pendulum, the length of the support arm 4, the position where the main mass 3 and the support arm 4 are connected by the link mechanism 6, etc. It is possible. In the present embodiment, these elements are set to correspond to the second natural period of the structure, that is, the natural period on the long period side. As a result, the structure and the main mass 3 and the sub mass 5 are shifted by about 90 degrees in phase and vibrate in the same cycle, and the vibration in the second vibration direction of the structure is reduced.

  As described above, according to the present embodiment, when the structure vibrates, in the X direction which is the first vibration direction, the support arm 4 and the sub mass 5 swing the main mass 3 by the link mechanism 6. Synchronize and translate. Further, in the Y direction which is the second vibration direction, the support arm 4 and the sub mass 5 are rotated by the link mechanism 6 in synchronization with the swing of the main mass 3.

  In the X direction, since the main mass 3 and the sub mass 5 vibrate together, the natural period of the main mass 3 and the sub mass 5 is determined by the length of the hanging arm 2. In the Y direction, the secondary mass 5 vibrates in the same phase as the primary mass 3 as an inverted pendulum, and the inertial force of the secondary mass 5 acts on the primary mass 3 via the link mechanism 6. The natural period of is longer than the natural period in the X direction.

  According to this, it is possible to reduce vibration in two orthogonal directions in a structure having different natural periods. In addition, regardless of the second natural period which is the natural period of the long side of the structure, the length of the hanging arm 2 is set to a length corresponding to the first natural period which is the natural period of the short side of the structure. it can. Therefore, the size of the vibration damping device 100 can be suppressed as compared with the vibration damping device in which the length of the hanging arm is set to a length corresponding to the natural cycle on the long cycle side.

  As mentioned above, although embodiment of this invention was described, the said embodiment showed only a part of application example of this invention, and it is not the meaning which limits the technical scope of this invention to the specific example of the said embodiment. .

  For example, in the above embodiment, the frame 1 is provided with the top plate 1a as the top and the bottom plate 1b as the bottom, but may be provided with the upper beam as the top or with the lower beam as the bottom It is also good.

  In addition, the ceiling or the upper beam of the structure may be used as the top portion of the frame 1, or the floor or the lower beam of the structure may be used as the bottom of the frame 1. That is, the structure itself may be used as the frame 1.

  Although the bearing 13 is provided as the pressing member for pressing the support arm 4 in the above embodiment, a resin member or the like having high slidability may be used instead of the bearing 13.

  Moreover, as shown in FIG. 3, it is also possible to make the damping device 100 AMD (Active Mass Damper) by adding an actuator 14 such as a hydraulic cylinder or an electric cylinder.

100 Vibration suppressor 1 Frame 1a Top board (top part)
1b Bottom plate (bottom)
2 Hanging arm (hanging member)
3 Main mass 4 Support arm (support)
5 Secondary mass 6 Link mechanism 13 Bearing (pressing member)

Claims (2)

When vibration is applied from the outside, it vibrates in a first vibration direction at a first natural period, and in a second vibration direction orthogonal to the first vibration direction, a second natural period longer than the first natural period A vibration control device for reducing vibration of a structure vibrating at
A main mass swingably suspended from the top of the frame by a suspension member;
A supporting body whose one end is connected to the bottom of the frame or to the structure so as to be movable in parallel in the first vibration direction and rotatable in the second vibration direction
A secondary mass attached to the other end of the support;
When the main mass swings in the first vibration direction, the support and the sub-mass move in parallel in synchronization with the swing of the main mass, and the main mass swings in the second vibration direction A link mechanism connecting the main mass and the support so that the support and the sub-mass rotate in synchronization with the swinging of the main mass when being separated;
A vibration control device comprising: The vibration control device according to claim 1, wherein
The link mechanism includes a pressing member attached to the main mass and pressing the support for parallel movement when the main mass swings in the first vibration direction.
Vibration control device characterized in that.

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