JP2022044253A - Eddy current type damper - Google Patents

Abstract

To provide an eddy current type damper in which a damper that may suppress vibration of a structure can be properly and easily installed.SOLUTION: An eddy current type damper which is provided together with a V type brace 2 in a frame formed of poles PL, PR and beams BU, BD of a structure S for suppressing vibration of the structure S comprises: a magnet holder 3 which is provided on the tip of the V type brace 2 and horizontally extends by a prescribed length; a facing extension body 4 which faces the magnet holder 3 with an interval of a prescribed distance in the vertical direction; and a plurality of permanent magnets 5 which are attached to the magnet holder 3, face the facing extension body 4 with an interval and are arranged along the longitudinal direction of the magnet holder 3. The facing extension body 4 is configured such that the eddy current for generating resistance force that prevents the movement is generated when the magnet holder 3 and the facing extension body 4 relatively move on the surface facing the plurality of permanent magnets 5 with an interval.SELECTED DRAWING: Figure 1

Description

The present invention relates to a damper for suppressing vibration of a structure, and is particularly provided on a frame made of columns and beams of the structure and a seismic isolation layer between the structure and a foundation supporting the structure together with braces and the like. Regarding eddy current type dampers.

Conventionally, as a damper provided together with a brace on a frame of a structure, for example, one disclosed in Patent Document 1 is known. This damper has dampers attached to the left and right sides and the lower three sides of the joint member at the lower end of the V-shaped brace (hereinafter referred to as "∨-shaped brace" in the present specification) provided inside the frame. ing. The above ∨ type brace has two brace materials that incline downward from the joint between the left and right columns and the upper beam and extend so as to approach each other, and the lower ends of both brace materials are the beams. It is joined to a joining member that extends horizontally along the length direction. Oil dampers are provided on both the left and right sides of the joining member, and inertial mass dampers are provided on the lower side of the joining member.

One end of each oil damper is attached to the end of the joint member, and the other end is attached to a damper mounting jig near the joint between the column and the lower beam. Both oil dampers and joining members are installed so as to be located on a common horizontal axis. On the other hand, the inertial mass damper is pin-bonded to the joining member in a rotatably state via a predetermined mounting member. In addition, the inertial mass damper is arranged so as to extend along the length direction of the beam, and both ends are slidable in the length direction and immovable in the vertical direction with respect to the lower beam via the linear guide. It is supported by the state.

Japanese Unexamined Patent Publication No. 2013-44155

The three dampers provided on the frame together with the above-mentioned ∨ type brace are connected between the joining member at the lower end of the ∨ type brace and the left and right columns and the lower beam, respectively. When these connections are made by bolting, it is necessary to match multiple bolt holes between the connection part on each damper side and the connection part on the joining member, damper mounting jig and linear guide side, which is extremely difficult. High accuracy is required. However, if manufacturing errors or twists in the structure occur during manufacturing, it is not possible to properly match the bolt holes of the connecting parts when installing each damper, and as a result, each damper is used. It may not be installed properly or it may take time to install.

The present invention has been made to solve the above problems, and to provide an eddy current type damper capable of appropriately and easily installing a damper capable of suppressing vibration of a structure. The purpose.

In order to achieve the above object, the invention according to claim 1 is a vortex current type damper provided in a frame made of columns and beams of a structure together with a brace having a predetermined shape to suppress vibration of the structure. , The brace has a pair of brace materials that are connected to one of the upper and lower beams arranged at a predetermined distance in the vertical direction and extend toward the other of the upper and lower beams so as to approach each other. A first extension that is provided at the tip of a pair of brace materials and extends by a predetermined length along the length direction of the other of the upper beam and the lower beam, and is provided integrally with the other of the upper beam and the lower beam. , A second extension body that extends a predetermined length along the other length direction and faces the first extension body at a predetermined distance in the vertical direction, and a first extension body and a second extension body. Attached to one, opposed to the other of the first and second extensions at intervals and arranged along the length direction of one of the first and second extensions. The first extension and the second extension are provided with a plurality of permanent magnets, and the other of the first extension and the second extension has the first extension and the second extension on a surface facing the plurality of permanent magnets at a distance from each other. It is characterized in that when it moves relatively, it is configured to generate a vortex current for generating a resistance force that hinders the movement.

According to this configuration, the brace having a pair of brace materials connected to one of the upper and lower beams and extending toward the other of the upper and lower beams so as to approach each other is a V-shaped brace (∨-shaped brace). ) Or an inverted V-shaped brace (hereinafter referred to as "∧-shaped brace" in the present specification). In the following explanation, unless otherwise specified, the term ∨-type brace includes ∧-type brace.

The tips of the pair of braces, that is, the tops of the ∨-shaped braces where both braces are close to each other, are first extended so as to extend a predetermined length along the other length direction of the upper beam and the lower beam. The structure is provided. Further, the other of the upper beam and the lower beam extends by a predetermined length along the length direction of the other, and the second extension body faces the first extension body in the vertical direction at a predetermined distance. Is provided. Further, a plurality of permanent magnets attached to one of the first extension body and the second extension body face the other of the first extension body and the second extension body at a distance and first. It is arranged along the length direction of one of the extension body and the second extension body. In the following description of this column, one of the first extension body and the second extension body, that is, the extension body to which a plurality of permanent magnets are attached is appropriately referred to as a "magnet side extension body". The other of the one extension body and the second extension body, that is, the extension body in which a plurality of permanent magnets face each other at intervals is appropriately referred to as an "opposite extension body".

Then, the other of the first extension body and the second extension body, that is, the opposite extension body, to which the plurality of permanent magnets face each other, is the first extension body and the first extension body on the surface facing the permanent magnets at a distance from each other. 2 When the extension body moves relatively, an eddy current for generating a resistance force that hinders the movement is generated.

Specifically, when the first extension body and the second extension body move relatively due to the relative displacement of the upper beam and the lower beam of the structure due to vibration such as an earthquake, there are a plurality of magnet-side extension bodies. It moves integrally with the permanent magnet. As a result, the magnetic field generated by the plurality of permanent magnets changes, and an eddy current due to electromagnetic induction is generated on the surface of the opposed extension body on which the permanent magnets face each other. Then, the Lorentz force due to this eddy current and its reaction force act as a resistance force that hinders the relative movement of the first extension body and the second extension body. As described above, the eddy current type damper of the present invention can absorb the vibration energy to the structure due to an earthquake or the like by the resistance force due to the eddy current, and can dampen the vibration of the structure.

Further, in the above-mentioned eddy current type damper, the magnet-side extension body, which is one of the first extension body and the second extension body, and the first extension body and the second extension body, which include a plurality of permanent magnets, are included. The other side of the extension body is configured to be separated from each other. That is, in the eddy current type damper of the present invention, the first extension body may be attached to the top of the brace and the second extension body may be attached to the upper beam or the lower beam. The eddy current type damper can be attached appropriately and easily as compared with the case where the two places such as the above are attached to the fixed portions on the frame side.

The invention according to claim 2 is provided in a seismic isolation layer set between the structure and the ground and one of the middle layers of the structure together with a support having a predetermined shape, and is a lower layer portion below the seismic isolation layer. It is an eddy current type damper for suppressing the vibration transmitted from the upper layer to the upper layer, and the support is connected to one of the upper layer and the lower layer arranged at a predetermined distance in the vertical direction from each other. The first extension, which is formed so as to extend toward the other of the upper layer and the lower layer, is provided at the tip of the support and extends horizontally by a predetermined length, and is integrated with the other of the upper and lower layers. The second extension body and the first extension body, which are provided and extend a predetermined length along the length direction of the first extension body and face the first extension body at a predetermined distance in the vertical direction. And attached to one of the second extension, facing the other of the first and second extension at intervals and in the length direction of one of the first extension and the second extension. A plurality of permanent magnets arranged along the line, and the other of the first extension and the second extension is the first extension in a plane facing the plurality of permanent magnets at a distance from each other. When the second extension body moves relatively, it is characterized in that an eddy current for generating a resistance force that hinders the movement is generated.

According to this configuration, an eddy current type damper is provided together with a support having a predetermined shape in the seismic isolation layer set between the structure and the ground and one of the middle layers of the structure. The eddy current type damper suppresses the vibration transmitted from the lower layer below the seismic isolation layer to the upper layer above the seismic isolation layer. The support is connected to one of the upper layer portion and the lower layer portion arranged at a predetermined distance in the vertical direction from each other, and is formed so as to extend toward the other. A first extension body and a second extension body similar to those in claim 1 described above are provided at the tip end portion of the support and one of the upper layer portion and the lower layer portion, respectively. Further, as in claim 1, a plurality of permanent magnets are attached to one of the first extension body and the second extension body (magnet side extension body), and the first extension body and the second extension body have different permanent magnets. The other (opposed extension) is configured such that when the extension moves relatively, an eddy current is generated to generate a resistance force that hinders the movement.

According to the eddy current type damper configured in this way, the same action and effect as in claim 1, that is, the vibration energy from the ground to the structure due to an earthquake or the like is absorbed by the resistance force due to the eddy current, and the structure is constructed. Vibration can be dampened. In addition, the first extension of the eddy current damper of the present invention may be attached to the tip of the support, and the second extension may be attached to the upper or lower layer, respectively, so that the eddy current damper can be appropriately and easily attached. Can be attached.

According to a third aspect of the present invention, in the eddy current type damper according to the second aspect, the support has a pair of brace materials extending from one of the upper layer portion and the lower layer portion so as to approach each other toward the other. It is characterized by being.

According to this configuration, by using a ∨-shaped brace having a pair of brace materials as a support, the first extension body supported on the top thereof can be stably supported.

The invention according to claim 4 is the eddy current type damper according to any one of claims 1 to 3, wherein the plurality of permanent magnets face the other of the first extension body and the second extension body of the adjacent magnets. It is characterized in that the magnetic poles are arranged so as to be different from each other.

According to this configuration, in a plurality of permanent magnets attached to one of the first extension body and the second extension body (magnet side extension body), the first extension body and the second extension of adjacent magnets are used. By arranging the magnetic poles facing the other side (opposing extending body) of the building so as to be different from each other, a loop shape from the north pole to the south pole is formed between the adjacent magnets and the facing facing extending body. Magnetic lines are generated. In a magnetic field having such lines of magnetic force, the first extension body and the second extension body move relative to each other in the length direction thereof, so that an eddy current is efficiently generated in the facing extension body, and the eddy current causes the eddy current. The Lorentz force can be effectively acted as a resistance force that hinders the relative movement of the first extension and the second extension.

The invention according to claim 5 is the eddy current type damper according to any one of claims 1 to 4, wherein one of the first extension body and the second extension body is made of a magnetic material, and a plurality of permanent magnets are used. To generate a loop-shaped magnetic force line with the end magnet adjacent to the end magnet, which is a magnet arranged at the end of one of the first extension and the second extension in the length direction. It is characterized in that the magnetic member of is attached.

According to this configuration, in one of the first extension body and the second extension body (magnet side extension body), the magnet side extension body is arranged at the end portion of the plurality of permanent magnets in the length direction. A magnetic member made of a magnetic material is attached so as to be adjacent to the end magnet which is a magnet. As a result, a loop-shaped magnetic force line is generated between the end magnet and the magnetic member, and while suppressing the magnetic force of the end magnet from leaking to the outside, the magnetic force is applied to the first extension body and the second extension. It can be stably applied to the other side of the body (opposite extension).

The invention according to claim 6 adjusts the magnetic force acting on the other of the first extension body and the second extension body of a plurality of permanent magnets in the eddy current type damper according to any one of claims 1 to 5. By doing so, it is characterized by further providing a resistance force adjusting mechanism for adjusting the magnitude of the resistance force.

According to this configuration, the resistance adjusting mechanism adjusts the magnetic force of the plurality of permanent magnets acting on the other of the first extension and the second extension (opposing extension), thereby adjusting the resistance. The magnitude of the force, that is, the resistance force that hinders the movement when the first extension body and the second extension body move relative to each other is adjusted. By adjusting the magnitude of the resistance force in this way, it is possible to appropriately install an eddy current type damper having a desired resistance force according to the installation location and the like.

The invention according to claim 7 is the eddy current type damper according to claim 6, wherein the resistance adjusting mechanism is made of a non-magnetic material and is attached to one of the first extension and the second extension. It was placed between the permanent magnet of No. 1 and the other of the first extension and the second extension, extended by a predetermined length along one length direction, and movably provided along the length direction. Spacing between the slider and the corresponding permanent magnets, made of magnetic material and corresponding to each of the plurality of permanent magnets, and between the first extension and the other of the second extension, respectively. It is characterized by having a plurality of pole pieces held by the slider and a slider drive mechanism for driving the slider in a separated state.

According to this configuration, the resistance adjusting mechanism has the above-mentioned slider, a plurality of pole pieces, and a slider driving mechanism. In a plurality of pole pieces, each made of a magnetic material, when the degree of vertical overlap with the corresponding permanent magnet is large, most of the magnetic flux generated by the permanent magnet passes through the corresponding pole piece and is first extended. It reaches the other side of the erection and the second extension (opposite extension). As a result, a relatively large eddy current is generated during the relative movement of the first extension and the second extension, and as a result, with respect to the relative movement of the first extension and the second extension. A relatively large resistance force acts to prevent it.

On the other hand, when the degree of vertical overlap between each pole piece and the corresponding permanent magnet is small, a part of the magnetic flux generated by the permanent magnet passes through the corresponding pole piece and does not reach the facing extension. It connects with an adjacent permanent magnet and causes a so-called short circuit. As a result, among the magnetic fluxes of the permanent magnets, the magnetic flux reaching the facing extension body is reduced, and the eddy current generated during the relative movement of the first extension body and the second extension body is reduced. As a result, the resistance to prevent the relative movement of the first extension body and the second extension body is reduced.

From the above, by driving the slider with the slider drive mechanism and adjusting the degree of vertical overlap between each permanent magnet and the corresponding pole piece, the relative movement of the first extension body and the second extension body is performed. At that time, the magnitude of the resistance force that hinders the movement can be easily adjusted.

According to the eighth aspect of the present invention, in the eddy current type damper according to the seventh aspect, the acceleration detecting means for detecting the acceleration of the vibration input to the structure and the slider drive mechanism are controlled according to the detected acceleration. The control unit is characterized in that the slider drive mechanism is controlled so that the greater the acceleration, the greater the degree of vertical overlap between each permanent magnet and the corresponding pole piece. do.

According to this configuration, the control unit responds to the acceleration of vibration input to the structure, and the greater the acceleration, the greater the degree of vertical overlap between each permanent magnet and the corresponding pole piece. Controls the slider drive mechanism. As a result, for example, when the acceleration of vibration input to the structure is large due to a large earthquake, the degree of vertical overlap between each permanent magnet and the corresponding pole piece is controlled to be large, so that the first method is performed. With respect to the relative movement of the extension body and the second extension body, a relatively large resistance force that hinders the movement can be obtained. On the other hand, when the acceleration is small due to a small earthquake, the first extension body and the second extension body are controlled so that the degree of vertical overlap between each permanent magnet and the corresponding pole piece becomes small. It is possible to obtain a relatively small resistance force that hinders the relative movement of the magnet. As described above, a resistance force having an appropriate magnitude can be obtained according to the above acceleration.

It is a figure which shows the eddy current type damper according to 1st Embodiment of this invention together with the structural material of a part of the building which installed it, (a) is a front view, (b) is an enlargement of a damper itself. The figure which shows the loop-shaped magnetic force line by a permanent magnet, (c) is the cross-sectional view along the line AA of (b). It is explanatory drawing for demonstrating the operation of the eddy current type damper shown in FIG. 1 (a). FIG. The state in which the magnet holder has moved to the left and the state in which the facing extension has moved to the right are shown in (c). It is a figure which shows the eddy current type damper by the 2nd Embodiment of this invention together with the structural material of a part of a building to which it applied, (a) is a front view, (b) is B of (a). -It is a cross-sectional view along line B. FIG. 3A is a diagram showing an enlarged view of the damper itself of the eddy current type damper shown in FIG. 3A and showing a loop-shaped magnetic force line by a permanent magnet, and FIG. 3A is a diagram showing the permanent magnet and the corresponding pole piece in the vertical direction. A state in which the degree of overlap is large, (b) indicates a state in which the degree of overlap is less than (a), and (c) indicates a state in which the degree of overlap is less than (b). It is a flowchart which shows the drive control of the slider which holds a pole piece. It is a figure which shows the state which the eddy current type damper by the 3rd Embodiment of this invention is installed in the seismic isolation layer between a building and the ground, (a) is a front view, (b) is C- It is sectional drawing along the C line. FIG. 6 is an enlarged view of the eddy current type damper shown in FIG. 6 and its surroundings. It is a figure which shows the eddy current type damper by the 4th Embodiment of this invention, (a) is the front view, (b) is the sectional view along the DD line of (a).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows an eddy current type damper according to the first embodiment of the present invention together with a part of structural materials of a building S (structure) in which the damper is installed. The building S shown in FIG. 6A is, for example, a high-rise building, and has a plurality of columns extending in the vertical direction (only the left column PL and the right column PR are shown) and a plurality of horizontally extending beams (upper beam BU and lower beam). It has a rigid frame structure in which only the beam BD (shown only) is combined in a grid shape.

As shown in FIG. 1A, the eddy current type damper 1 has a V-shaped front surface inside a frame composed of the left and right columns PL and PR and the upper and lower beams BU and BD. It is provided together with the ∨ type brace 2 (support) formed in. The ∨ type brace 2 has a pair of brace materials 2a and 2a extending downward from the two joints of the upper beam BU and the left and right columns PL and PR so as to approach each other downward, and below them. A magnet holder 3 described later of the eddy current type damper 1 is attached to the tip portion on the side. Each brace material 2a is made of H-shaped steel or the like, and the upper end is fixed to the joint between the upper beam BU and the left and right columns PL or PR by bolting or the like, and the lower end is the center in the length direction of the magnet holder 3. It is fixed in the vicinity by bolting. The brace materials 2a and 2a are connected to each other at predetermined portions below them via an auxiliary rib 2b extending horizontally.

The eddy current type damper 1 includes a magnet holder 3 (first extension body) that extends horizontally by a predetermined length along the length direction of the lower beam BD (the left-right direction in FIG. 1A) and the length of the lower beam BD. Opposing extension 4 (second extension) fixed on the lower beam BD, horizontally extending by a predetermined length along the vertical direction and facing the magnet holder 3 in the vertical direction at a predetermined distance. A plurality of (six in this embodiment) permanent magnets (hereinafter, simply referred to as "magnets") 5 and magnetic poles, which are attached to the lower surface of the magnet holder 3 and face the upper surface of the opposed extending body 4 at predetermined intervals. It is provided with a block 6 (magnetic member).

The magnet holder 3 is made of a magnetic material (for example, carbon steel or cast iron), has a relatively long predetermined length as described above, and has a central portion in the length direction at the lower end portion of the ∨ type brace 2 by a bolt or the like. It is fixed. In FIG. 1 (c), the cross section of the magnet holder 3 is shown in a rectangular shape for convenience of illustration, but if the lower surface is horizontal and a plurality of magnets 5 can be attached, cross sections of various shapes can be used. It is possible to adopt what it has (for example, H-shaped steel).

The opposed extending body 4 is made of a conductive material, for example, a metal having ferromagnetism such as carbon steel or cast iron, and has substantially the same length dimension as the magnet holder 3. Further, the opposed extending body 4 is arranged so as to extend in parallel with the magnet holder 3 at a predetermined distance in the vertical direction, and at the lower end portion, extends along the length direction and extends in the front-rear direction (FIG. 1). At the flange portion protruding in the front-back direction of (a) and the left-right direction of (c) of the same figure, the flange portion is bolted onto the lower beam BD. As the material of the opposed extending body 4, in addition to the above-mentioned carbon steel and cast iron, it is also possible to use a weak magnetic material or a non-magnetic material such as stainless steel, aluminum, copper, or an alloy thereof. .. In FIG. 1, for convenience of illustration, the cross section of the opposed extending body 4 is shown in a substantially rectangular shape, but if the upper surface is horizontal and is configured to be separated from each magnet 5 by a predetermined distance, It is possible to adopt those having various cross-sectional shapes (for example, H-shaped steel).

Each magnet 5 is formed in a block shape having a rectangular planar shape and a predetermined size, and is configured so that the magnetic poles (N pole and S pole) are different between the upper half portion and the lower half portion. Further, in the adjacent magnets 5 and 5, the magnetic poles facing the facing extending bodies 4 below are arranged so as to be different from each other. On the other hand, each magnetic pole block 6 is made of a magnetic material such as iron, and is formed in a block shape having the same shape and size as the magnet 5. These magnets 5 and the magnetic pole block 6 are arranged in a row along the length direction of the magnet holder 3 with a predetermined distance from each other, and are separated from each other by a predetermined distance in the vertical direction with respect to the facing extension body 4. It is attached to the lower surface of the magnet holder 3 by adhesion, bolting, or the like in a state of facing each other. In the following description, a plurality of magnets 5 arranged in a row are collectively referred to as a "magnet row 5" as appropriate.

The magnetic pole block 6 is arranged so as to be adjacent to end magnets 5a and 5a, which are magnets at both left and right ends of the magnet row 5. As a result, as will be described later, a loop-shaped magnetic force line is generated between the end magnet 5a and the magnetic pole block 6 by the end magnet 5a.

Although not shown, the eddy current type damper 1 is provided with a cover that can be attached to the lower beam BD while covering the periphery thereof. With such a cover, it is possible to prevent dust and dirt from entering between the facing extension body 4, the magnet 5, and the magnetic pole block 6. Further, by forming the cover with a material capable of shielding magnetism, it is possible to prevent the magnetism of each magnet 5 from leaking to the outside.

In the eddy current type damper 1 configured as described above, in the magnet row 5 attached to the lower surface of the magnet holder 3, as shown in FIG. 1 (b), the magnetic force lines emitted from the north pole of each magnet 5 are It is generated in a loop between the upper magnet holder 3 and the lower facing extension body 4 so as to pass through two adjacent magnets 5 and 5 and return to the S pole of the original magnet 5.

Further, in the two magnetic pole blocks 6 and 6 arranged on the left and right sides of the magnet row 5, magnetic force lines due to the end magnets 5a are generated in a loop between the two magnetic pole blocks 6 and 6 adjacent to the end magnets 5a. By providing the magnetic pole block 6 as described above, it is possible to stably exert the magnetic force on the opposed extension body 4 while suppressing the magnetic force of the end magnet 5a from leaking to the outside.

Next, the operation of the eddy current type damper 1 configured as described above will be described. FIG. 2A shows a state before the operation of the eddy current type damper 1. When a relative displacement occurs in the length direction between the upper beam BU and the lower beam BD due to an earthquake or wind from the state shown in the figure (a), for example, as shown in the figure (b). In addition, the magnet holder 3 connected to the upper beam BU via the ∨ type brace 2 moves to the right, while the opposed extension body 4 moves to the left integrally with the lower beam BD. In this case, the magnet holder 3 moves integrally with the magnet row 5 with respect to the facing extension body 4, so that the magnetic field due to the magnet row 5 changes, whereby the electromagnetic wave is applied to the upper surface of the facing extension body 4. An induced eddy current is generated. Then, the Lorentz force and its reaction force due to the eddy current act on the magnet holder 3 and the opposed extending body 4 as a resistance force that hinders the relative movement of the two.

Further, from the state shown in FIG. 2A, contrary to the above, as shown in FIG. 2C, the magnet holder 3 moves to the left while the opposed extension body 4 moves to the right. Also in this case, the magnetic field generated by the magnet train 5 changes, so that an eddy current due to electromagnetic induction is generated on the upper surface of the opposed extension body 4. Then, the Lorentz force and its reaction force due to the eddy current act on the magnet holder 3 and the opposed extending body 4 as a resistance force that hinders the relative movement of the two.

As described in detail above, according to the eddy current type damper 1 of the present embodiment, the vibration energy to the building S due to an earthquake or the like can be absorbed by the resistance force due to the eddy current, and the vibration of the building S can be attenuated. ..

Further, in the eddy current type damper 1 described above, the magnet holder 3 including the plurality of magnets 5 and the facing extension body 4 are configured to be separated from each other. That is, in the eddy current type damper 1 of the present embodiment, the magnet holder 3 may be attached to the lower end of the ∨ type brace 2 and the opposed extending body 4 may be attached to the lower beam BD. For example, for a single damper, both ends thereof may be attached. The eddy current type damper 1 can be attached appropriately and easily as compared with the case where two places such as a portion are attached to the fixed portions on the frame side.

Next, a second embodiment of the present invention will be described with reference to FIGS. 3 to 5. In the eddy current type damper 1A of the present embodiment, the same components as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The eddy current type damper 1A includes a resistance force adjusting mechanism 11 for adjusting the resistance force that hinders the relative movement of the magnet holder 3 and the facing extension body 4, and the electric power used for driving the resistance force adjusting mechanism 11. A power generation device 12 for generating electric power is provided.

The resistance adjusting mechanism 11 is arranged between the magnet row 5 and the opposed extending body 4, extends a predetermined length along the length direction of the magnet holder 3, and is a movable slider 14 along the length direction thereof. A plurality of (six in this embodiment) pole pieces 15 attached to the slider 14 and corresponding to the plurality of magnets 5 and a slider drive mechanism 16 for driving the slider 14 are provided.

The slider 14 is made of a non-magnetic material and is formed in a plate shape extending slightly longer than the magnet holder 3. Further, the front end portion and the rear end portion of the slider 14 are arranged in the length direction of the slider 14 on the hanging walls 17 and 17 (see FIG. 3B) hanging from the front end portion and the rear end portion of the lower surface of the magnet holder 3, respectively. It is engaged in a slidable state (in the left-right direction in FIG. 3A). Further, a plurality of through holes penetrating in the vertical direction are formed in the slider 14 at positions corresponding to the plurality of magnets 5 above, and the pole piece 15 is fitted in the through holes. There is. The slider 14 may be made of a non-magnetic material, and various materials such as synthetic resin, stainless steel, and aluminum alloy can be used.

The pole piece 15 is made of a magnetic material, has a rectangular planar shape, is formed in a block shape having a predetermined size, and has a cross section having substantially the same size as the magnet 5 described above. Further, the pole pieces 15 are arranged at predetermined intervals between the magnet 5 on the upper side and the opposed extending body 4 on the lower side, respectively.

The slider drive mechanism 16 includes a motor 16a and a gear mechanism 16b driven by the motor 16a. The gear mechanism 16b is composed of a plurality of gears and the like, and is configured to convert the rotary motion output from the motor 16a into a linear motion for driving the slider 14. The space between the slider 14 and the facing extension body 4 is covered by the front and rear (left and right in FIG. 3B) covers 18 and 18.

On the other hand, the power generation device 12 includes a power generation unit 21 that converts a linear motion due to the relative movement of the magnet holder 3 of the vortex current type damper 1A and the facing extension body 4 into a rotary motion, and generates power by the converted rotary motion. ing.

As shown in FIG. 3B, the power generation unit 21 extends by a predetermined length along the length direction of the magnet holder 3, and has a rack 22 fixed to the upper surface of the magnet holder 3 and a pinion 23 that meshes with the rack 22. It is provided with a generator 24 that generates electricity based on the rotation of the pinion 23, and a support cover 25 that covers the pinion 23 and the generator 24 in a supported state and is attached to a lower beam BD. The support cover 25 can be attached to the facing extension body 4 instead of the lower beam BD.

The generator 24 includes a rotor 26 and a stator 27 provided so as to surround the outer periphery thereof and one end (right end in FIG. 3B). A plurality of permanent magnets 26a (only two are shown in FIG. 3B) are provided on the entire outer peripheral surface of the rotor 26 along the circumferential direction thereof. On the other hand, the stator 27 is provided with a plurality of coils 27a (only two are shown in FIG. 3B) along the circumferential direction in a state of facing the permanent magnets 26a of the entire outer peripheral surface of the rotor 26.

The rotor 26 of the pinion 23 and the generator 24 is provided with a common rotating shaft 28 fixed so as to penetrate the central portion thereof. One end (the left end of FIG. 3B) of the rotating shaft 28 is rotatably supported by the support cover 25, and the other end (the right end of FIG. 3B) is the support cover 25. , Or is rotatably supported by the stator 27 of the generator 24 fixed to the stator 27.

Further, as shown in FIG. 3A, a control unit 29 for controlling the slider drive mechanism 16 of the resistance force adjusting mechanism 11 described above is attached to the right beam PR, and a building is attached to the upper beam BU. An acceleration sensor 30 (acceleration detecting means) for detecting an acceleration indicating the magnitude of vibration input to S is attached. The electric power generated by the power generation device 12 is stored in, for example, a battery (not shown) provided in the support cover 25 or in the vicinity of the control unit 29.

The control unit 29 is composed of a microcomputer including a CPU, RAM, ROM, an input / output interface (none of which is shown), and the like. The acceleration AC detected by the acceleration sensor 30 is input to the CPU after being A / D converted and shaped by the input interface. The CPU controls the slider drive mechanism 16 based on the control program stored in the ROM according to the detected acceleration AC.

In the power generation device 12 configured as described above, the pinion 23 that meshes with the rack 22 rotates as the magnet holder 3 and the facing extension body 4 move relative to each other. Then, the rotor 26 of the generator 24 rotates integrally with the pinion 23, and the electric power generated by the coil 27a of the stator 27 is output to the battery. The electric power stored in this battery is used as a drive source for the resistance adjusting mechanism 11.

FIG. 4 shows the operation of the slider drive mechanism 16 in the resistance adjusting mechanism 11 of the eddy current type damper 1A, and the loop-shaped magnetic force lines by the magnet 5. FIG. (A) shows a state in which the slider 14 in the slider drive mechanism 16 is located at the first predetermined position. At this first predetermined position, the pole pieces 15 corresponding to the magnets 5 are almost exactly overlapped in the vertical direction, and the degree of overlap in the vertical direction is large. In this case, as shown in FIG. 6A, almost all the magnetic force lines (magnetic flux) generated by each magnet 5 reach the facing extension body 4 through the corresponding pole piece 15. As a result, a relatively large eddy current is generated when the magnet holder 3 and the facing extension body 4 move relative to each other, and as a result, the relative movement between the magnet holder 3 and the facing extension body 4 is hindered. Great resistance acts.

Further, FIG. 4B shows a state in which the slider 14 is located at the second predetermined position. At this second predetermined position, the degree of overlap of the pole pieces 15 corresponding to each magnet 5 is smaller than that at the first predetermined position in the above-mentioned figure (a). In this case, as shown in FIG. 3B, a part of the magnetic flux generated by each magnet 5 is short-circuited to the adjacent magnet 5 via the corresponding pole piece 15. As a result, of the magnetic flux generated by each magnet 5, the magnetic flux that reaches the facing extension body 4 through the corresponding pole piece 15 is reduced. By that amount, the eddy current generated when the magnet holder 3 and the facing extension body 4 move relative to each other becomes smaller, and the resistance force that hinders the relative movement of the magnet holder 3 and the facing extension body 4 also becomes smaller accordingly.

Further, FIG. 4C shows a state in which the slider 14 is located at a third predetermined position. At this third predetermined position, the degree of overlap of the pole pieces 15 corresponding to each magnet 5 is smaller than that of the second predetermined position in the above-mentioned figure (b). In this case, as shown in FIG. 3C, a part of the magnetic flux generated by each magnet 5 is further short-circuited to the adjacent magnet 5 via the corresponding pole piece 15. As a result, of the magnetic flux generated by each magnet 5, the magnetic flux that reaches the facing extension body 4 through the corresponding pole piece 15 is further reduced. By that amount, the eddy current generated when the magnet holder 3 and the facing extension body 4 move relative to each other becomes smaller, and the resistance force that hinders the relative movement between the magnet holder 3 and the facing extension body 4 becomes larger accordingly. It becomes even smaller.

FIG. 5 shows an example of drive control processing of the slider 14 in the slider drive mechanism 16 according to the acceleration AC detected by the acceleration sensor 30. This process is repeatedly executed at predetermined time intervals.

In this process, first, in step 1 (shown as “S1”; the same applies hereinafter), it is determined whether or not the acceleration AC is equal to or higher than a predetermined small reference acceleration AC_S, which is relatively small. When this determination result is NO, it is assumed that there is almost no vibration input to the building S and it is not necessary to operate the resistance force adjusting mechanism 11, and this process is terminated as it is.

On the other hand, when the determination result in step 1 is YES, the process proceeds to step 2, and it is determined whether or not the acceleration AC is equal to or higher than the predetermined medium reference acceleration AC_M, which is larger than the small reference acceleration AC_S. When the determination result is NO, that is, when AC_S≤AC <AC_M, the position of the slider 14 (hereinafter, simply referred to as "slider position SP") is set to the third predetermined position P3 shown in FIG. 4 (c) described above. Set (step 3) and end this process. When the slider 14 is already located at the third predetermined position SP3, the slider 14 is maintained as it is, and when the slider 14 is located at a position other than the third predetermined position SP3, the slider 14 is moved to the third predetermined position SP3. Move to.

If the determination result in step 2 is YES, the process proceeds to step 4, and it is determined whether or not the acceleration AC is equal to or greater than the predetermined large reference acceleration AC_L, which is larger than the medium reference acceleration AC_M. When the determination result is NO, that is, when AC_M≤AC <AC_L, the slider position SP is set to the second predetermined position SP2 shown in FIG. 4B described above (step 5), and the present process is terminated. .. When the slider 14 is already located at the second predetermined position SP2, the slider 14 is maintained as it is, and when the slider 14 is located at a position other than the second predetermined position SP2, the slider 14 is moved to the second predetermined position SP2. Move.

On the other hand, when the determination result in step 4 is YES, that is, when the acceleration AC is equal to or higher than the large reference acceleration AC_L, the slider position SP is set to the first predetermined position SP1 shown in FIG. 4A described above (step). 6), this process is terminated. When the slider 14 is already located at the first predetermined position SP1, the slider 14 is maintained as it is, and when the slider 14 is located at a position other than the first predetermined position SP1, the slider 14 is moved to the first predetermined position SP1. Move.

As specific examples of the above-mentioned small reference acceleration AC_S, medium reference acceleration AC_M, and large reference acceleration AC_L, for example, the response acceleration (gal) of a building having a period of 0.5 to 6 seconds (including a vibration control building and a seismic isolation building) is It is as follows.
Small reference acceleration AC_S: Response acceleration ≤ 5 to 11 (seismic intensity 0 to 3)
Medium reference acceleration AC_M: 5 to 11 <Response acceleration ≤ 50 to 110 (seismic intensity 4 to 5)
Large reference acceleration AC_L: 50-110 <Response acceleration (seismic intensity 5 upper)

As described in detail above, according to the eddy current type damper 1A of the present embodiment, as in the first embodiment described above, the vibration energy to the building S due to an earthquake or the like is absorbed by the resistance force of the eddy current, and the building is built. The vibration of S can be attenuated.

Further, the eddy current type damper 1A is provided with a resistance adjusting mechanism 11 and a power generation device 12, and the power generation device 12 allows the magnet holder 3 and the facing extension body 4 to move relative to each other due to the vibration of the building S. At that time, the linear motion due to the relative movement of both 3 and 4 is converted into a rotational motion, and the converted rotational motion is used to generate electric current. Then, the resistance adjusting mechanism 11 is driven by using the generated electric power as a drive source. In this way, the resistance adjusting mechanism 11 can be driven by using the electric power obtained by utilizing the vibration of the building S. Further, in the resistance force adjusting mechanism 11, the slider 14 is driven by the slider driving mechanism 16 to adjust the degree of vertical overlap between each magnet 5 and the corresponding pole piece 15, so that the magnet holder 3 and the facing extension body are formed. When the relative movement of 4 is performed, the magnitude of the resistance force that hinders the movement can be easily adjusted.

Further, in the resistance force adjusting mechanism 11, the degree of vertical overlap between the magnet 5 and the corresponding pole piece 15 increases as the acceleration AC increases according to the acceleration AC of the vibration input to the building S. The slider drive mechanism 16 is controlled. As a result, for example, when the acceleration of vibration input to the building S is large due to a large earthquake, the slider drive mechanism 16 increases the degree of vertical overlap between each magnet 5 and the corresponding pole piece 15. By controlling the above, it is possible to obtain a relatively large resistance force that hinders the relative movement of the magnet holder 3 and the facing extension body 4. On the other hand, when the acceleration AC is small due to a small earthquake, the magnet holder 3 and the facing extension body 4 are controlled so that the degree of vertical overlap between each magnet 5 and the corresponding pole piece 15 becomes small. It is possible to obtain a relatively small resistance force that hinders the relative movement of the magnet. As described above, a resistance force having an appropriate magnitude can be obtained according to the above acceleration AC.

In the present embodiment, the power generation device 12 is used to drive the resistance adjusting mechanism 11, but instead of this, a power outlet in the building S can be used.

Next, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7. In the eddy current type damper 1B of the present embodiment, the same components as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

This eddy current type damper 1B has almost the same configuration as the eddy current type damper 1 of the first embodiment described above, and is installed in the seismic isolation layer L set between the building S and the ground G. However, it is different from the first embodiment.

As shown in FIG. 6, at the bottom of the building S, an upper foundation beam FU having a grid-like planar shape and a plurality of projects protruding downward from the intersection of the upper foundation beam FU (FIG. 6 (b)). Twelve) upper foundation FSs are integrally provided. On the other hand, in the ground G, lower foundation beams FD are provided in a grid pattern so as to correspond to the upper foundation beam FU, and a plurality of lower foundations projecting upward at positions corresponding to the plurality of upper foundation FSs. The FG is integrally provided. A seismic isolation device 32 is installed between each lower foundation FG and the corresponding upper foundation FS. On the other hand, between the lower foundation beam FD and the upper foundation beam FU, a plurality of (17 in this embodiment) eddy current type dampers 1B are installed together with a ∨ type brace 2 that supports them.

Although detailed description is omitted, the seismic isolation device 32 is made of, for example, a lead plug, a laminated rubber with a plug using a tin plug, or the like. Further, the seismic isolation device 32 supports the vertical load of the building S, is deformable in the horizontal direction with respect to the seismic motion input from the ground G, and has a restoration function of returning to the original position. ..

As shown in FIG. 7, in the ∨ type brace 2, the upper end portion of each brace material 2a is fixed to the upper foundation beam FU from below via a plurality of anchor bolts (not shown), and the lower ends of both brace materials 2a and 2a. The portion is fixed near the center in the length direction of the magnet holder 3 of the eddy current type damper 1B. Further, the facing extension body 4 of the eddy current type damper 1B is fixed from above on the lower foundation beam FD via a plurality of anchor bolts (not shown).

As described above, according to the eddy current type damper 1B of the present embodiment, the same action and effect as those of the first embodiment described above, that is, the vibration energy to the building S due to an earthquake or the like is absorbed by the resistance force due to the eddy current. However, the vibration of the building S can be damped.

FIG. 8 shows a fourth embodiment of the present invention. In this embodiment, a support plate 34 (support body) having a rectangular front shape is used instead of the ∨-shaped brace 2 of the third embodiment described above. The support plate 34 is configured by vertically connecting two vertically symmetrical plate materials made of steel plates or the like (hereinafter, the upper and lower plate materials are referred to as "upper plate material 35" and "lower plate material 36", respectively). Has been done. The upper plate material 35 has a vertically long plate-shaped main body portion 35a and a flange portion 35b provided at the upper end portion thereof, so that the vertical cross section is formed in a T shape. The upper plate material 35 is fixed to the upper foundation beam FU from below with the flange portion 35b via a plurality of anchor bolts (not shown), and the lower end portion of the main body portion 35a is connected to the lower plate material 36. ..

The lower plate material 36 has a main body portion 36a and a flange portion 36b configured in the same manner as the main body portion 35a and the flange portion 35b of the upper plate material 35 described above. In the lower plate material 36, the flange portion 36b is provided at the lower end portion of the main body portion 36a, and the vertical cross section is formed in an inverted T shape. Then, the lower end portion of the main body portion 35a of the upper plate material 35 and the upper end portion of the main body portion 36a of the lower plate material 36 are sandwiched between two front and rear connecting plates extending in the left-right direction. In this embodiment, 18) bolts 38 and nuts 39 are fixed, whereby the upper plate material 35 and the lower plate material 36 are firmly connected.

Further, in the eddy current type damper 1C of the present embodiment, the lower end portion of the support plate 34, specifically, the flange portion 36b of the lower plate material 36 is the magnet holder of each of the eddy current type dampers 1, 1A and 1B described above. It plays the role of 3. That is, a plurality of magnets 5 are arranged on the lower surface of the flange portion 36b of the lower plate material 36 at intervals along the length direction thereof, and are adjacent to the end magnets 5a at both ends. The magnetic pole block 6 is arranged.

Further, on the lower foundation beam FD, the facing extension body 4 is fixed via anchor bolts (not shown). Similar to the first to third embodiments described above, the opposed extending body 4 is predetermined along the length direction of the lower foundation beam FD in a state where the magnet 5 and the magnetic pole block 6 are spaced apart from each other. It is arranged so as to extend in length.

As described above, according to the eddy current type damper 1C of the present embodiment, the same action and effect as those of the first and third embodiments described above, that is, the vibration energy to the building S due to an earthquake or the like, is resisted by the eddy current. It can be absorbed by force and the vibration of the building S can be damped. Further, in the present embodiment, by using the support plate 34 having a rectangular front shape instead of the ∨ type brace 2, the lower end portion of the support plate 34 can be used as a magnet holder, and the plurality of magnets 5 and the plurality of magnets 5 and the support plate 34 can be used. The magnetic pole block 6 can be stably supported at a desired position.

The present invention is not limited to each of the described embodiments, and can be carried out in various embodiments. For example, in the eddy current type dampers 1, 1A, 1B and 1C of the first to fourth embodiments, the magnet holders 3 (including the flange portion 36b of the fourth embodiment) and the opposed extending bodies 4 arranged vertically are used. Among them, a plurality of magnets 5 and a magnetic pole block 6 are attached to the upper magnet holder 3, but the present invention is not limited to this, and instead of the magnet holder 3, the lower opposed extending body 4 is attached. It is also possible to attach the magnet 5 and the magnetic pole block 6.

Further, in the first to third embodiments, the ∨-shaped brace 2 is adopted as the support for supporting the eddy current type dampers 1, 1A and 1B, but of course, the inverted V-shaped ∧-shaped brace can also be adopted. It is possible. In this case, one of the magnet holder 3 and the facing extension body 4 is connected to the top (upper end) of the ∧ type brace, and the other of the magnet holder 3 and the facing extension body 4 is connected to the lower surface of the upper beam BU. Be concatenated. Further, in the third and fourth embodiments, the basic seismic isolation building in which the vortex current type dampers 1B and 1C are installed in the seismic isolation layer L set between the building S and the ground G is exemplified, but the present invention illustrates the building. However, it is not limited to this, and it can be applied to a seismic isolated building on the middle floor where a seismic isolation layer is set in the middle layer of the building.

Further, the detailed configurations of the eddy current type dampers 1, 1A, 1B and 1C and the ∨ type brace 2 shown in each embodiment are merely examples, and may be appropriately changed within the scope of the present invention. Can be done.

1 Eddy current type damper 1A Eddy current type damper 1B Eddy current type damper 1C Eddy current type damper 2 ∨ type brace (support)
2a Brace material 3 Magnet holder (1st extension)
4 Opposing extension body (second extension body)
5 Permanent magnet 5a End magnet 6 Magnetic pole block (magnetic member)
11 Resistance adjustment mechanism 12 Power generation device 14 Slider 15 Pole piece 16 Slider drive mechanism 29 Control unit 30 Accelerometer (accelerometer detection means)
34 Support plate (support)
S building (structure)
PL Left pillar PR Right pillar BU Upper beam BD Lower beam AC acceleration AC_S Small reference acceleration AC_M Medium reference acceleration AC_L Large reference acceleration SP Slider position P1 First predetermined position P2 Second predetermined position P3 Third predetermined position FU Upper foundation beam FD Lower part Foundation beam FS Upper foundation FG Lower foundation L Seismic isolation layer

Claims (8)

An eddy current damper that is provided on a frame made of columns and beams of a structure together with braces of a predetermined shape to suppress vibration of the structure.
The brace has a pair of brace materials connected to one of an upper beam and a lower beam arranged at a predetermined distance in the vertical direction and extending toward the other of the upper beam and the lower beam so as to approach each other. And
A first extension body provided at the tip of the pair of brace materials and extending by a predetermined length along the other length direction of the upper beam and the lower beam.
A second beam that is provided integrally with the other of the upper beam and the lower beam, extends by a predetermined length along the length direction of the other beam, and faces the first extension body in the vertical direction at a predetermined distance. With the extension body,
Attached to one of the first extension and the second extension, facing the other of the first extension and the second extension at a distance and facing the other of the first extension and the second extension at a distance, and the first extension and the second extension. A plurality of permanent magnets arranged along the length direction of one of the structures,
Equipped with
The other of the first extension and the second extension moves relative to the first extension and the second extension on a surface facing the plurality of permanent magnets at a distance from each other. An eddy current type damper characterized in that it is configured to generate an eddy current to generate a resistance force that hinders its movement. It is provided together with a support having a predetermined shape in the seismic isolation layer set between the structure and the ground and in one of the middle layers of the structure, from the lower layer below the seismic isolation layer to the upper layer above. An eddy current type damper for suppressing transmitted vibration.
The support is connected to one of the upper layer portion and the lower layer portion arranged at a predetermined distance in the vertical direction from each other, and is formed so as to extend toward the other of the upper layer portion and the lower layer portion.
A first extension body provided at the tip of the support and horizontally extending by a predetermined length,
It is provided integrally with the other of the upper layer portion and the lower layer portion, extends by a predetermined length along the length direction of the first extension body, and is separated from the first extension body by a predetermined distance in the vertical direction. With the second extension body facing each other,
Attached to one of the first extension and the second extension, facing the other of the first extension and the second extension at a distance and facing the other of the first extension and the second extension at a distance, and the first extension and the second extension. A plurality of permanent magnets arranged along the length direction of one of the structures,
Equipped with
The other of the first extension and the second extension moves relative to the first extension and the second extension on a surface facing the plurality of permanent magnets at a distance from each other. An eddy current type damper characterized in that it is configured to generate an eddy current to generate a resistance force that hinders its movement. The eddy current damper according to claim 2, wherein the support has a pair of brace members extending from one of the upper layer portion and the lower layer portion so as to approach each other toward the other layer. .. The plurality of permanent magnets are any of claims 1 to 3, wherein the magnetic poles of the first extension body and the second extension body of the adjacent magnets facing the other are arranged so as to be different from each other. Eddy current type damper described in the magnet. The one of the first extension and the second extension is made of a magnetic material, and the length direction of the one of the first extension and the second extension of the plurality of permanent magnets. 1 to 4, wherein a magnetic member for generating a loop-shaped magnetic force line is attached adjacent to the end magnet, which is a magnet arranged at the end of the magnet. The eddy current type damper described in either. Further provided with a resistance adjusting mechanism for adjusting the magnitude of the resistance by adjusting the magnetic force acting on the other of the first extension and the second extension of the plurality of permanent magnets. The eddy current type damper according to any one of claims 1 to 5, wherein the damper is provided. The resistance adjusting mechanism is
Between the plurality of permanent magnets made of a non-magnetic material and attached to the one of the first extension and the second extension and the other of the first extension and the second extension. A slider that is arranged, extends a predetermined length along the one length direction, and is movably provided along the length direction.
It is made of a magnetic material and is arranged so as to correspond to each of the plurality of permanent magnets, and is spaced between the corresponding permanent magnets and the other of the first extension and the second extension. A plurality of pole pieces held by the slider with the magnets separated from each other.
A slider drive mechanism that drives the slider,
The eddy current type damper according to claim 6, wherein the damper is provided with an eddy current type damper. Acceleration detection means for detecting the acceleration of vibration input to the structure, and
A control unit that controls the slider drive mechanism according to the detected acceleration,
Further prepare
7. The control unit controls the slider drive mechanism so that the greater the acceleration, the greater the degree of vertical overlap between each of the permanent magnets and the corresponding pole pieces. Eddy current type damper described in.

Images