JPH04339975A - Method and apparatus for damping vibration - Google Patents

Abstract

PURPOSE:To damp vibration at low cost in a mechanism where a mass member traverses on a guide member. CONSTITUTION:A vibrating damping member is provided with a mass member 20 and a guide member 12 supporting it to be able to vibrate so as to be arranged in a plane in which the center of the member 20 is almost erected perpendicularly. When a vibration 2 is generated at its installation site, the guide member 12 is rotated around the almost perpendicularly erected axis of the guide member 12 so as to force the guiding direction of the member 20 to nearly coincide with the oscillation direction of the installation site. When necessary, the natural frequency is forced to be also changeable in accordance with the vibration direction.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is designed to reduce vibrations caused by wind or earthquakes in tall buildings, etc. by having a mass member run on a guide member, and to cope with vibrations in different directions. The present invention relates to a vibration damping method and a vibration damping device. The present invention also relates to a vibration damping method and a vibration damping device that allow different natural frequencies to be obtained depending on the vibration direction.

0002

2. Description of the Related Art Conventionally, this type of vibration damping method and device includes a mass member running on a rail extending in a certain direction, and a rail extending in a direction transverse to the rail is provided on this mass member. A system in which another mass member runs has been proposed, but it has the disadvantage that the structure is quite complicated and expensive.

0003

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vibration damping method and a vibration damping device that can damp vibrations at low cost in a device in which a mass member runs on a guide member.

0004

[Means for Solving the Problems] The present invention includes a mass member,
A vibration damping method using a vibration damping device having a guide member that supports the mass member so that it can vibrate by disposing it in a plane in which the center of the mass member is substantially upright; There is provided a vibration damping method characterized in that the guide member is rotated about a substantially upright axis so that the direction in which the member guides the mass member substantially coincides with the vibration direction of the installation location. The present invention also provides a vibration damping method in which when the guide member rotates, it vibrates at a natural frequency close to the natural frequency of the installation location.

The present invention also provides a vibration damping device comprising a mass member and a guide member that vibrably supports the mass member so that the center of the mass member is disposed in a substantially upright plane, the guide member a support device that supports the guide member so as to be rotatable around a substantially upright axis near the center; a drive device that rotates the guide member; and a drive device that detects the vibration direction of the installation location and rotates the guide member so as to substantially match the vibration direction. The present invention provides a vibration damping device characterized in that it includes a control device that sends a rotation signal to the drive device. Further, in such a vibration damping device, the guide member is configured by sequentially connecting a plurality of constituent elements, and the natural frequency of the mass member is adjusted to the natural frequency of the installation location by changing the approximate radius of curvature. The present invention also provides a vibration damping device characterized in that it is provided with an operating device that makes the vibration near the natural frequency. Moreover, there is also a vibration damping device of almost this type, which detects the vibrating frequency of the installation location separately from the natural frequency of the installation location, and adjusts the natural frequency of the mass member to the vicinity of this frequency. The present invention provides a vibration damping device characterized by being provided with.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In one embodiment of the present invention shown in FIGS. 1 to 3, reference numeral 10 denotes a base firmly fixed to the installation location by means not shown. Reference numeral 12 denotes a guide member which is curved so that the central part is lower and both sides are higher. 1
3 is a rail-shaped guide portion formed on both sides of the lower part of the guide member, 15 is an engaging portion formed by bending both sides of the guide member 12 inward at the upper part, and 16 is provided on both ends of the guide member 12. A locking portion 17 is a shaft extending downward from the lower center of the guide member 12, and a disk-shaped portion 18 formed at the lower end is rotatably held on the base 10. Base 10 and shaft 17
constitutes a support device for the guide member 12.

Reference numeral 20 denotes a mass member having sufficient mass to vibrate and suppress vibrations when vibration occurs at the installation location, and has two wheels 21 on each side of the guide member 1.
The vehicle runs on the guide section 13 of No. 2. Grooves 22 are formed on both sides of the mass member to prevent the engaging portion 15 from engaging and coming off the guide member 12. The center of the mass member 20 is supported so as to be able to vibrate in a plane upright in the direction in which the guide member 12 extends.

Reference numeral 23 denotes a vibration meter for detecting vibrations, such as a seismometer, provided on the base 10, and inputs the detection results when vibrations occur to the computer 25. This computer and vibration meter 23 constitute a control device. The computer 25 determines the direction of vibration and generates a signal to rotate the guide member 12 so as to extend in that direction, and inputs the signal to a reversible electric motor 27 serving as a drive device. This electric motor drives the shaft 17 through gears 28 and 30 to rotate the guide member 12 so that it extends in the vibration direction of the installation location. Although not shown, it is desirable to provide a damping device that applies an appropriate damping force to the movement of the mass member 20.

In the configuration as described above, when a large vibration occurs due to an earthquake or the like, the vibration meter 23 detects this, inputs the detection result to the computer 25, and uses the computer 25 to determine whether or not it is necessary to change the direction. After confirming this, the direction of the guide member 12 is changed by driving the electric motor 27 as necessary according to instructions from this computer. Since the mass member 20 is arranged substantially in the direction of vibration of the guide member 12 at the installation location, the mass member 20 undergoes a large reciprocating motion on the guide member. This reciprocating motion provides a large damping force to the building etc. via the guide member 12. Normally, the natural frequency of the mass member 20 is determined approximately by the radius of curvature of the guide member 12, and is made to be approximately equal to the natural frequency of a building or the like. Therefore, this embodiment is not suitable for buildings, etc. whose natural frequencies vary greatly depending on the direction of vibration.

FIGS. 4 and 5 show embodiments in which different parts of the above-mentioned embodiments are modified. That is, in FIG. 4, the mass member 20 runs on the guide portion 13 of the horizontal guide member 12, and the helical spring 31
are connected to both sides so that they can vibrate. In FIG. 5, a rack 33 is provided which is operated by, for example, an air cylinder 32 without using an electric motor to rotate the shaft 17, and this rack meshes with a gear 30 so that it can rotate.

In other embodiments of the present invention shown in FIGS. 6 to 9, for example, the guide member 12 is always arranged in the direction of the lowest natural frequency, and when vibration occurs and the direction is different from that direction, the guide member 12 is moved. It is rotated in that direction, but at the same time, the natural frequency is also changed. That is, in these figures, the guide member 12 is connected to a plurality of components 3.
5 are connected to each other so as to be movable sequentially. The central component 35 is fixed to the upper end of the shaft 17. Component 3
5 has guide portions 37 on both sides, which are connected by a connecting portion 38. 40 is a bolt that rotatably connects the components 35 to each other. The natural frequency of the mass member 20 can be lowered by increasing the angle of the connecting portion of each component 35 so that the support member 12 has a large radius of curvature as a whole, and by decreasing the angle of the connecting portion, the natural frequency of the mass member 20 can be reduced. If the radius is set, the natural frequency of the mass member 20 becomes high. 41 is a mounting member fixed to the shaft 17, 42 is a lever connected to both sides of this mounting member by bolts 43 so as to be rotatable in the vertical direction, and 45 is a wheel provided at the tip of this lever. Reference numeral 46 denotes a link whose both ends are rotatably connected to each of the constituent elements 35 except for the central part and to the lever 42 by bolts 47, respectively. Reference numeral 48 denotes a support member arranged in an annular shape to support the wheels 45 of the lever 42. When cut in half and unfolded with the lowest position as the center, the state shown in FIG. 9 is obtained, and the other halves are also symmetrical and have the same shape. Become.

For example, if the wheel 45 of one lever 42 is always at the lowest position 48a of the support member 48, the other wheel is also at the same position, and in this case the guide member 12 moves the mass member 20 to the lowest natural vibration. It is something that is supported in the form of numbers. When the shaft 17 is rotated, for example, by 90 degrees from this state, the guide member 12 and lever 42 are also rotated at the same time, and each wheel 45 comes to the highest position 48b. The mass member 20 is supported in a state where the vibration frequency is reached. Both of these natural frequencies are made to be approximately close to the natural frequencies in each direction of the installation location such as a building.

In another embodiment of the invention, shown in FIG.
An elevating member 53 is provided which is lifted and lowered by a drive device 52 consisting of, for example, an air cylinder, which is supported on a mounting member 50 fixed to the shaft 17 without using the lever 42.
The natural frequency of the mass member 20 is changed by rotating the guide member 12 to change the approximate radius of curvature of the guide member 12 (not shown). As the drive device 52, a hydraulic operating device, an electric motor, etc. can also be used. Therefore, when vibration occurs, the direction of the vibration is detected and the guide member 12 rotates, and at the same time the mass member 20 is changed to a desired natural frequency by the drive device 52. In this embodiment, if the natural frequency of the installation location differs from the expected value when vibration occurs, the vibration meter 23
The approximate radius of curvature of the guide member 12 can also be adjusted so that the natural frequency of the mass member 20 becomes close to the natural frequency detected by the computer 25.

[0014] Various modifications can be made to this invention. For example, the guide member 12 is connected to a plurality of components 3
5, it may also consist of only two components rotatably connected to each other at the upper end of the shaft 17. Furthermore, in order to change the approximate radius of curvature of the guide member 12, the angle between each component 35 may be changed using an air cylinder (not shown) or the like, without using the lever 42. Additionally, the component 35 of the guide member 12
The guide portion 37 may be somewhat recessed when viewed from above.

[0015]

The present invention has the effect of providing an extremely simple and inexpensive vibration damping method and vibration damping device that can automatically cope with any horizontal vibration direction.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a partially cutaway plan view of the embodiment shown in FIG. 1;

FIG. 4 is a front view showing a main part of another embodiment of the present invention with some changes.

FIG. 5 is a plan view showing a main part of another embodiment of the present invention with some changes.

FIG. 6 is a partially cutaway or cross-sectional front view of another embodiment of the invention;

FIG. 7 is a partially cutaway plan view thereof.

FIG. 8 is an exploded perspective view of some of its components.

FIG. 9 is a diagram showing half of the support member expanded around the lowest position.

FIG. 10 is a front view of main parts showing another embodiment of the present invention with some changes.

[Explanation of symbols]

10 Base 12 Guide member 17 axis 20 Mass member 23 Vibration meter 25 Computer 27 Electric motor 35 Components 42 Lever 45 Wheels 46 Link 48 Support member 52 Drive device

Claims (5)

[Claims] 1. A vibration damping method using a vibration damping device having a mass member and a guide member that vibrably supports the mass member so that the center of the mass member is disposed in a substantially upright plane, the method comprising: A vibration damping method characterized in that when vibration occurs at a location, the guide member is rotated about a substantially upright axis so that the direction in which the guide member guides the mass member substantially matches the vibration direction of the installation location. . 2. A vibration damping method using a vibration damping device having a mass member and a guide member that vibrably supports the mass member so that the center of the mass member is disposed in a substantially upright plane, the method comprising: When vibration occurs at a location, the guide member is rotated about an approximately vertical axis so that the direction in which the guide member guides the mass member approximately matches the vibration direction of the installation location, and the natural vibration of the mass member is rotated. A vibration damping method characterized by changing the frequency to near the natural frequency of the installation location in the rotated direction. 3. A vibration damping device comprising a mass member and a guide member that vibrably supports the mass member so that the center thereof is disposed in a substantially upright plane, the guide member being disposed in a substantially upright plane, the guide member being arranged in a substantially upright plane. a support device that supports the guide member so as to be rotatable about an axis that is substantially upright; a drive device that rotates the guide member; and a drive device that detects the vibration direction of the installation location and rotates the guide member so as to substantially match the vibration direction. A vibration damping device comprising: a control device that sends a signal to the drive device. 4. A vibration damping device comprising a mass member and a guide member that vibrably supports the mass member so that the center thereof is disposed in a substantially upright plane, the guide member being arranged near the center of the guide member. a support device that supports the guide member so as to be rotatable about an axis that is substantially upright; a drive device that rotates the guide member; and a drive device that detects the vibration direction of the installation location and rotates the guide member so as to substantially match the vibration direction. a control device that sends a signal to the drive device, and the guide member is configured by sequentially connecting a plurality of components to change the approximate radius of curvature to set the natural frequency of the mass member. A vibration damping device characterized by being provided with an operating device that makes the vibration near the natural frequency of the place. 5. A vibration damping device comprising a mass member and a guide member that vibrably supports the mass member so that the center thereof is disposed in a substantially upright plane, the guide member being arranged near the center of the guide member. a support device that supports the guide member so as to be rotatable around an axis that is substantially upright; a drive device that rotates the guide member; and a drive device that detects the vibration direction and frequency of the installation location and moves the guide member so that the vibration direction substantially coincides with the vibration direction. a control device that sends a rotation signal to the drive device, and the guide member is configured by sequentially connecting a plurality of components, and changes the approximate radius of curvature to change the natural vibration of the mass member. 1. A vibration damping device comprising an operating device that makes the number of vibrations close to the frequency detected at the installation location.