JPH02217575A - Vibration controlling device for building - Google Patents

Abstract

PURPOSE:To make a device function well as a vibration controller by installing, to one part of two members that relatively move following vibration of a building, a pair of magnets facing each other with a prescribed distance, and by installing, to the other part, a conductor that moves crossing a line of magnetic force. CONSTITUTION:To one part (Fa) of two members that relatively move following vibration of a building B, a pair of permanent magnets 3 and 3 are installed facing each other via brackets 2, 2 with a prescribed distance and lines of magnetic force L and L are generated thereby. A conductor 4 is installed to the other part (Fb) of the two members, and is inserted under noncontact condition to a space between the permanent magnets 3 and 3 in the direction intersecting the lines of magnetic force L and L. The conductor 4 is further made to move in the direction crossing the lines of magnetic force L and L. When vibration occurs to the building B, the conductor 4 relatively moves in the direction crossing the lines of magnetic force L and L and the vibration can be controlled and damped thereby.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a vibration suppression device for structures, and in particular to a vibration suppression device that effectively damps vibrations of structures caused by external forces such as earthquakes and wind. It is related to the device.

[Prior Art] Examples of vibration suppressing devices conventionally used to damp the shaking of structures include oil dampers, rope dampers, and viscous dampers.

The oil damper has a movable member slidably fitted in the cylinder that divides the inside of the cylinder into a plurality of hydraulic oil chambers, and these divided hydraulic oil chambers are communicated through a small diameter pipe, The cylinder and the movable member are moved relative to each other to follow the displacement of the structure, and the movable member guides the hydraulic oil filled in one hydraulic oil chamber through a small diameter pipe to the other hydraulic oil chamber, and the movable member is operated. The vibration energy of the structure is absorbed by utilizing the flow path resistance that occurs when oil passes through the small diameter pipe.

Further, the steel damper absorbs the vibration energy of the structure V through hysteresis deformation using its plastic deformation region.

Furthermore, in a viscous damper, a viscous body is sealed in a container, a movable member attached to a structure is moved within the viscous body, and the vibration energy of the structure is absorbed using the viscous resistance generated at that time. I try to do that.

[Problems to be Solved by the Invention] By the way, in each of the conventional vibration suppressing devices described above,
It has the following problems.

In other words, in any vibration suppression device, the damping force is not proportional to the vibration speed, and it is difficult to adjust this damping force, so it is difficult to make precise settings that match the vibration characteristics of the structure. First, there is another problem in that damping force control cannot be performed in accordance with disturbances.

Furthermore, in oil dampers and viscous dampers, the damping force changes greatly depending on temperature and vibration frequency, and it is assumed that vibration suppression characteristics change due to changes in the environment.

Therefore, in the past, it has been desired to deal with such problems, and the present invention aims to solve these problems.

[Means for Solving the Problems] The present invention provides a vibration suppression device for a structure that can effectively solve the above-mentioned problems. A vibration suppressing device provided between two moving members, in which a pair of magnets are arranged facing each other at a predetermined interval in one part, and lines of magnetic force between the two magnets are arranged in the other part between the pair of magnets. It is characterized by being provided with a conductor that can be moved across.

[Operation] According to the vibration suppressing device for a structure according to the present invention, when vibration occurs in the structure, the conductor is moved relative to both magnets in a direction that crosses the lines of magnetic force.

At this time, the density of the magnetic lines of force changes in the direction of movement of the conductor, before and after the magnet is sandwiched between them, but at the same time, eddy currents are generated in the conductor to suppress changes in the lines of magnetic force.
A force is generated between the conductor and the magnet that suppresses their relative movement, and this force acts on the structure as a force that dampens the vibration, thereby suppressing the vibration of the structure.

[Example 1] An example of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral l indicates a vibration suppressing device for a structure (hereinafter abbreviated as vibration suppressing device) according to this embodiment, and the structure B
They are installed on each floor F using the walls, etc.

That is, the vibration suppressing device 1, as shown in FIG.
A pair of brackets 2 are erected in parallel at a predetermined interval on the lower part Fa of the wall of each floor F, permanent magnets 3 are integrally attached to these brackets 2, and the permanent magnet 3 is attached to the upper part Fb of the wall. A plate-shaped conductor 4 is vertically inserted between the conductors 3 and 3 in a non-contact manner.

In this embodiment, the lower portion Pa and the upper portion Fb of the wall are a pair of parts that are moved relative to each other by vibrations of the structure B, and the pair of brackets 2 and the permanent magnets 3 are Lower part Fa and upper part F
The conductors 4 are arranged at intervals in a direction substantially orthogonal to the direction of relative movement with respect to b, and the conductors 4 are arranged along the direction of relative movement.

The conductor 4 is made of a non-magnetic and conductive material such as an aluminum plate, and is disposed between the permanent magnets 3 at a predetermined distance therebetween.

Therefore, the conductor 4 is disposed perpendicular to the line of magnetic force between both permanent magnets 3, and is moved in a direction perpendicular to the line of magnetic force.

Next, the operation of the vibration suppressing device 1 of this embodiment configured as described above will be explained.

When vibration occurs in structure B due to an earthquake or wind, an interlayer displacement occurs between the upper part PB and the lower part Pa of the wall, and as a result, the conductor 4 moves relative to both brackets 2 and the permanent magnet 3. I am made to do so.

Due to such relative movement between the conductor 4 and the permanent magnet 3, the conductor 4 is moved so as to cross the lines of magnetic force between the permanent magnets 3, and the transmission position of the line of magnetic force with respect to the conductor 4 is also moved. The density of the lines of magnetic force changes in the front and rear portions of the permanent magnet 3 in the moving direction of the permanent magnet 3, respectively.

Since the changes in the lines of magnetic force in the front and rear parts are opposite, eddy currents are generated in each area that suppresses changes in the lines of magnetic force, and relative movement between the conductor 4 and the permanent magnet 3 occurs. A force that suppresses the vibration is generated, and this force acts on the structure B as a force that damps the vibration, so that the vibration of the structure B is suppressed.

In such a vibration suppressing effect, the permanent magnet 3 and the conductor 4
The damping force generated between the two is obtained in proportion to the rate of change of the lines of magnetic force l, in other words, the damping force is proportional to the strength of the magnetic force of the permanent magnet 3 and the speed of relative movement between the two. can get.

Therefore, when the magnetic force of the permanent magnet 3 is constant, the damping force is adjusted depending on the amplitude and frequency of vibration of the structure B, that is, depending on the relative speed between the permanent magnet 3 and the conductor 4. A good vibration suppression effect can be obtained.

Further, since the permanent magnet 3 and the conductor 4 are always maintained in a non-contact state, there is no change over time such as wear, and durability and reliability are improved.

It should be noted that the shapes and dimensions of each component shown in the above embodiments are merely examples, and can be variously changed based on the type of structure to which it is applied, the installation position, design requirements, etc.

For example, in the above embodiment, an example was explained in which the vibration suppression device 1 was provided on each floor F and on a wall portion, but it may be provided on an appropriately selected floor F or at a position other than the wall. Good too.

Further, as shown in FIG. 3, structure B is constructed on laminated rubber 5 fixed on ground A to provide a seismic isolation structure, and between structure B and ground A, the laminated rubber 5 is A vibration suppression device 1 may be provided in parallel.

Furthermore, as shown in FIG. 4, the vibration suppressing device 1 can be provided between the structure B and another structure built adjacent to it. With this configuration, both structures B-
The effect of suppressing mutual resonance can be obtained.

On the other hand, an electromagnet can also be used instead of the permanent magnet 3.

In this case, by combining a sensor that detects the magnitude of vibration of structure B and a computer that controls the current supplied to the electromagnet, the current supplied to the electromagnet can be adjusted according to the magnitude of the vibration. , it is possible to generate a fine damping force according to the magnitude of vibration, and it is possible to obtain a more effective vibration suppressing effect.

[Effects of the Invention] As explained above, the vibration suppressing device for a structure according to the present invention provides the following excellent effects.

Simultaneously with the vibration of the structure, by moving the magnet and conductor relative to each other in a direction across the lines of magnetic force, an eddy current is generated in the conductor that suppresses changes in the lines of magnetic force (magnetic flux density), and
A force is generated that suppresses relative movement between the conductor and the magnet, and this force can damp vibrations of the structure.

The damping force generated between the magnet and the conductor is obtained in proportion to the rate of change of the lines of magnetic force, so the damping force is obtained in proportion to the strength of the magnetic force of the magnet and the speed of relative movement between the two.
As a result, the damping force is adjusted according to the relative speed between the magnet and the conductor, and a good vibration suppressing effect can be obtained according to the vibration of the structure.

Further, since the magnet and the conductor are always maintained in a non-contact state, there is no change over time such as wear, and durability and reliability are improved.

[Brief explanation of the drawing]

In the drawings, FIGS. 1 and 2 show an embodiment of the present invention, FIG. 1 is a schematic front view of a structure to which the embodiment is applied, and FIG. 2 is an enlarged view of the embodiment. , 3 and 4 are schematic front views of structures showing other embodiments of the present invention. l...Vibration suppressor, 2...Bracket, 3...Permanent magnet (magnet), 4...Conductor, B
···Structure,

Claims (1)

[Claims] A vibration suppressing device provided between two members that move relative to each other due to vibration of a structure, in which a pair of magnets are arranged facing each other at a predetermined interval in one part, and a magnet in the other part is arranged opposite to each other at a predetermined interval. A vibration suppression device for a structure, comprising: a conductor that is moved across the lines of magnetic force between both magnets;