JP2682875B2 - Structure damping device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vibration damping device having an omnidirectional automatic sensing function for horizontal vibration and twisting motion of a structure.

[Conventional technology]

Regarding a device for controlling the vibration of a structure due to an external force such as a wind or an earthquake, the present inventor has recently developed a vibration damping device using the principle of angular momentum.

This vibration damping device is a structure in which a rotating body attached to a frame and rotatable about a rotation axis is supported by a beam of the frame so as to be rotatable about a central axis orthogonal to the rotation axis of the rotating body. The body is designed to rotate at high speed around a vertical axis of rotation (Japanese Patent Application No. 1-136727).

[Problems to be solved by the invention]

Since the above-mentioned vibration control device controls vibration in one direction in the horizontal direction of the structure, two vibration control devices must be installed in order to obtain the vibration damping force in the two horizontal directions. No
Further, when the vibration damping force in the horizontal direction is obtained by one vibration damping device, there is a problem that an undesired twisting force is accompanied by a slight structure.

Further, since the torsional vibration generated in the structure due to the influence of external force cannot be controlled by the above horizontal vibration damping device, in order to obtain the vibration damping force against the torsional motion, the horizontal vibration damping device By changing the direction of the rotation axis of the rotating body,
It is necessary to rotate at a high speed around a horizontal axis of rotation or separately install a single vibration damping device for torsional motion.

The present invention has been made for the purpose of solving the above problems.

[Means for solving the problem]

In order to achieve the above object, in the present invention, a main vibration damping device and a sub vibration damping device are arranged on a support table installed on a structure and capable of rotating up to 90 ° around a vertical axis. .

The main vibration damping device and the sub vibration damping device are made of the same constituent member, and each has a frame, a rotating body that rotates at high speed around a rotating shaft attached to the frame, and an outer periphery of the frame is orthogonal to the rotating shaft of the rotating body. And a beam supported at both ends in the axial direction.

The beam of the frame of the main vibration suppressor and the beam of the frame of the sub vibration suppressor are rotatably supported around horizontal and parallel axes, and the rotating body of the main vibration suppressor rotates in the vertical direction. It is rotatably held about an axis, and the rotor of the secondary damping device is rotatably held about a horizontal axis of rotation.

A rotation stopping mechanism is provided to the rotation mechanism connecting the support and the structure, if necessary.

[Action]

The vibration damping device of the present invention, when the horizontal vibration generated in the structure by the external force matches the direction of the central axis of the beam of the main vibration damping device, the main vibration damping device operates by sensing the vibration, Generates a moment as a vibrating force.

On the other hand, since the sub vibration damping device does not sense the vibration in this direction, no vibration damping force is generated. However, the sub-vibration damping device operates by sensing the twisting force that accompanies the operation of the main damping device, and prevents the structure from being twisted.

Further, when the structure is vibrating horizontally in the direction orthogonal to the central axis of the beam of the main vibration suppressor, the main vibration suppressor does not sense the vibration in this direction, and thus does not immediately operate. However, the sub-vibration damping device senses this vibration and operates to generate a moment around the axis in the vertical direction. This moment causes the support to rotate 90 ° with respect to the structure and stop. At this position, the central axis of the beam of the main vibration damper coincides with the vibration direction. Then, the main vibration damping device senses the vibration and generates a moment as a vibration damping force.

Further, when the structure is twisted by an external force, the sub vibration damping device senses and operates to generate a moment as a vibration damping force. In this case, the rotation mechanism of the support base is stopped and fixed to the structure. On the other hand, since the main vibration damping device does not sense the torsional movement, no vibration damping force is generated.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a view showing the overall structure of the vibration damping device of the present invention cut along a vertical plane including the X axis.

The support base 2 is attached to the structure 1 and the support mechanism 2 is a rotation mechanism (eg, a slewing bearing)
It is installed via 3 and can rotate about a vertical axis. A main vibration damping device 10 and a sub vibration damping device 20 are vertically arranged on the support base 2.

The main vibration damping device 10 is a flat weight-proof circular frame 11
A rotary shaft 13 that accommodates a disk-shaped rotating body 12 whose outer peripheral portion is formed thicker than the inner peripheral portion and is provided on the center line of the rotating body 12.
Both ends of the frame are rotatably supported around the central axis of the frame 11, and the beam is provided on the outer periphery of the frame 11 at both ends in the axial direction (diameter direction) orthogonal to the rotation axis 13 of the rotating body 12.
It is configured with 14 and 15 attached (see Fig. 2).

The sub vibration damping device 20 is also composed of the same structural members as the main vibration damping device 10, that is, the frame 21, the rotating body 22, the rotary shaft 23, and the beams 24 and 25 (see FIG. 3).

The beams 14 and 15 of the frame 11 of the main vibration damping device 10 are
It is rotatably supported on the support base 2 about a horizontal axis,
The rotating shaft 13 of the rotating body 12 is adapted to rotate at a high speed while being held in the vertical direction.

The beams 24 and 25 of the frame 21 of the other secondary vibration damping device 20 are
The support base 2 is rotatably supported around a horizontal axis parallel to the beams 14 and 15 of the frame 11 of the main vibration control device 10, and the rotary shaft 23 of the rotary body 22 is held in the horizontal direction. It is designed to rotate at high speed.

In the vibration damping device of the above configuration, the beam of the main vibration damping device 10
The central axes of 14, 15 and the beams 24, 25 of the auxiliary vibration damping device 20 are parallel to the X-axis direction as shown in FIG. 1, and the rotor 12 of the main vibration damping device 10 is shown in FIG. It is assumed that the sub-damping device 20 rotates at high speed in the arrow direction, and the rotor 22 of the sub-vibration damping device 20 rotates at high speed in the arrow direction shown in FIG.

When the structure 1 vibrates in the horizontal direction due to an external force in this state, the vibration damping device operates as follows.

First, as shown in FIGS. 1 and 4, the structure 1 is
It is assumed that the vibration vibrates in the X-axis direction and horizontal displacement (rotation angle θ _X ) to the right in the figure occurs.

Thereby, the rotary shaft 13 of the rotating body 12 of the main vibration damping device 10,
Since given rotation angle theta _X around the Y-axis forces, the moment generated about a central axis of the beam 14, 15 of the main damping device 10 (X ₁ axis), rotary body 12 of the X ₁ axis Around (second
Rotate (in the direction of the arrow in the figure). This rotation of the rotating body 12 causes a moment M _{10 in the} direction of the arrow in FIG. 4 around the Y axis of the main vibration damping device 10. This moment M ₁₀ is
Since it acts as a vibration damping force in the direction in which the X ₁ axis coincides with the X axis, the horizontal displacement (rotation angle θ _X ) generated in the structure 1 is offset, and vibration is suppressed.

The sub-vibration damping device 20 allows the structure 1 to vibrate in the X-axis direction,
Since the rotation axis 23 of the rotating body 22 is not given a rotation angle about the Y axis, it does not rotate about the central axis (X ₁ axis) of the beams 24, 25, and it suppresses vibrations in the X axis direction. No force is generated.

Moment generated around the Y-axis of the main vibration damping device 10
M ₁₀ acts on the structure 1 as a couple via the support base 2, but since the support base 2 has a rotation angle of θ _X with respect to the X axis, the horizontal component of the couple is a structure. 1 acts as a twisting force around the Z axis (counterclockwise).

However, with respect to this twisting force, the sub-vibration damping device 20 operates to generate a moment in the opposite direction around the Z-axis, so that twisting motion that is not preferable for the structure 1 can be suppressed. . The operation mechanism of the sub vibration damping device 20 with respect to this twisting force will be described later.

Next, as shown in FIG. 5 and FIG.
It is assumed that the vibration vibrates in the Y-axis direction and horizontal displacement (rotation angle θ _Y ) to the right in the figure occurs.

As a result, the rotary shaft 23 of the rotating body 22 of the sub vibration damping device 20 is
Since the rotation angle θ _Y about the X-axis is forcibly given, a moment M ₂₀ that attempts to rotate around the central axis (Z ₁ axis) of the beams 24, 25 of the sub vibration damping device ₂₀ is generated ( (See arrow direction in Fig. 3).

This moment M ₂₀ causes the support base 2 to start rotating via the rotation mechanism 3 between the support base 2 and the structure 1. The rotation of the support base 2 ends when the rotary shaft 23 of the rotary body 22 of the auxiliary vibration damping device 20 reaches a position orthogonal to the Y axis, that is, a position where vibration in the Y axis direction is not sensed, and FIG. Stop at the 90 ° rotated position as shown in. In order to prevent the support base 2 from rotating excessively, the rotation angle of the support base 2 is controlled to a maximum of 90 ° by a stopper (not shown).

During this period, the rotating shaft 13 of the rotating body 12 of the main vibration damping device 10 does not immediately generate a damping force against the vibration in the Y-axis direction even if a forced rotation angle is given about the X-axis. When the rotation of the support base 2 with respect to the structure 1 is completed and the central axes of the beams 14 and 15 coincide with the Y-axis direction, the operation is performed in the same manner as in the case of the vibration in the X-axis direction described above. A moment M _{10 in the} direction of the arrow in Fig. 7 is generated. This moment M ₁₀ acts as a damping force in the direction in which the central axes (Y ₁ axes) of the beams 14 and 15 of the main vibration damping device 10 coincide with the Y axis, so that the horizontal displacement (rotation The angles θ _Y ) will cancel out.

When the structure 1 is twisted around the Z axis by an external force, the vibration damping device operates as follows.

In this case, the operation of the rotation mechanism 3 provided between the structure 1 and the support base 2 is stopped by a stop mechanism (not shown), and the support base 2 is fixed to the structure 1.

Due to the twisting motion of the structure 1, the rotating body 22 of the auxiliary vibration damping device 20
As shown in FIG. 8, the rotation angle of the rotation axis 23 about the Z axis is θ.
₂ is given, beam 2 of the secondary vibration damping device 20
Due to the moment generated around the central axis (X ₁ axis) of 4,25, the rotating body 22 rotates around the X ₁ axis (in the direction of the arrow in the figure). A moment M _{20 in the} direction of the arrow in the figure is generated around the Z axis of ₂₀ . This moment M ₂₀ acts as a damping force in the direction of matching the X ₁ axis of the sub vibration damping device 20 with the X axis, so that the rotation angle θ ₂ generated in the structure 1 is canceled out, and the torsional movement is caused. Be deterred.

Rotating body 12 of main vibration damping device 10 against torsional movement of structure 1
The rotation angle of the Z axis is not given to the rotary shaft 13 and the rotary shaft 13 does not rotate around the central axes of the beams 14 and 15, so that a moment as a damping force is not generated.

In the above embodiment, the case where one main vibration damping device and one sub vibration damping device are arranged in the vertical direction is shown, but the arrangement method and the number of main vibration damping devices and sub vibration damping devices are arbitrary. Can be set.

FIG. 9 is another arrangement example of the vibration damping device, in which one main vibration damping device 10 is arranged at the center of the support base 2, and one main vibration damping device 10 is provided on each of the left and right sides in the lateral direction of the main vibration damping device 10. A secondary vibration damping device 20 is arranged.

〔The invention's effect〕

As described above, the vibration damping device of the present invention includes the frame that rotatably supports the rotating body that rotates at a high speed and the beam that supports the frame at both ends in the axial direction orthogonal to the rotation axis of the rotating body. The main damping device and the sub-damping device are arranged on a support that is rotatable around vertical axes, and the beams of the main and sub-damping devices are rotatably supported around parallel horizontal axes. , The rotation axis of the rotor of the main damping device is held vertically, the rotation axis of the rotor of the auxiliary damping device is held horizontally, and the principle of angular momentum, that is, the rotation axis of the rotor is adopted. When a rotation angle is given by an external force, the main vibration suppressor suppresses horizontal vibration and the sub-vibration suppressor suppresses horizontal vibration by the principle that a moment is generated around the axis orthogonal to the support beam of the frame. Sharing the function of suppressing the rotation and twisting motion of the It has to so that.

Therefore, according to the present invention, since the main vibration damping device has a vibration damping force not only for horizontal vibration in one direction but also for horizontal vibration in the other direction orthogonal thereto, one main vibration damping device is used. It is possible to suppress horizontal vibrations in all directions by the vibration control device, and it is possible to prevent the twisting force generated when the main vibration control device is activated by the auxiliary vibration control device.

Further, according to the present invention, even when the structure is twisted by an external force, it can be restrained by the auxiliary vibration damping device by stopping the rotation mechanism of the support base. The damping force against movement is obtained.

[Brief description of the drawings]

1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of the main vibration damping device of FIG. 1, FIG. 3 is a plan view of the auxiliary vibration damping device of FIG. 1, and FIG. Is an operating state diagram of the vibration damping device when horizontal vibration occurs in the structure in the X-axis direction, FIG. 5 is a sectional view taken along the line AA of FIG. 1, and FIGS. FIG. 8 is an operational state diagram of the vibration damping device when horizontal vibration occurs in the Y-axis direction, FIG. 8 is an operational state diagram of the vibration damping device when the structure is twisted, and FIG. It is a side sectional view showing an example of. In the figure, 1 is a structure, 2 is a support base, 3 is a rotating mechanism, 10 is a main vibration damping device, 11 is a frame, 12 is a rotating body, 13 is a rotating shaft, 1
4, 15 are beams, 20 is a secondary vibration damping device, 21 is a frame, 22 is a rotating body, 23 is a rotating shaft, and 24 and 25 are beams.

Claims (2)

(57) [Claims] 1. A support, which is installed in a structure and has a mechanism capable of rotating up to 90 ° about a vertical axis, and a frame, and a rotation supported by the frame, which are each made of the same component. A main vibration damping device and a sub vibration damping device each having a rotating body mounted so as to be capable of rotating at a high speed around an axis, and a beam mounted on the outer periphery of the frame at both ends in the axial direction orthogonal to the rotation axis of the rotating body. The support base rotatably supports the beam of the main vibration suppressor and the beam of the auxiliary vibration suppressor about horizontal parallel axes, and the rotation axis of the rotating body of the main vibration suppressor in the vertical direction. The vibration damping device for a structure, characterized in that the rotary shaft of the rotating body of the auxiliary vibration damping device is held in the horizontal direction. 2. The vibration damping device for a structure according to claim 1, wherein the rotation mechanism of the support base is provided with a rotation stopping mechanism.