JP6552915B2 - Damping device and damping method - Google Patents

Description

  Embodiments described herein relate generally to a vibration damping device and a vibration damping method for damping a structure using a magnetic damping.

  As shown in FIG. 15, as a vertical seismic isolation to cope with the vertical ground motion of the structure, the seismic isolation object 1 as a structure is flexibly supported by the vertical seismic isolation element 2 and the seismic isolation object There is known a method for reducing the response acceleration of 1 in the vertical direction. At that time, as shown by arrow P in FIG. 15, a reciprocating movement (rocking vibration) called rocking in which the seismic isolation target 1 tilts is generated. In addition, a structure floating on the water surface such as a ship swings due to factors such as waves and winds. As a rocking reduction device for reducing such rocking, one in which a magnetic damper is applied to a pendulum type dynamic vibration absorber using a rolling mass, a pendulum type dynamic vibration absorption in which a spherical mass is rolled on a spherical plate Vessels are known.

JP-A-8-216875 JP 2004-340163 A

  The swing reduction device described in Patent Document 1 is a pendulum type dynamic vibration absorber in which a dolly-type mass body having wheels reciprocates on an arc-shaped rail for the purpose of damping the ropeway swing. A magnet and a conductor are arranged to constitute a magnetic damper. In this configuration, since the motion of the mass body is only movement along the curved surface of the rail, the vibration damping effect by the dynamic vibration absorber is limited to one direction. For this reason, two or more dynamic vibration absorbers installed in different directions are required for horizontal two-dimensional rocking.

  Further, the swing reduction device described in Patent Document 2 is a pendulum type dynamic vibration absorber in which a spherical mass body rolls on a spherical plate, and can obtain a damping effect in all directions. However, in this configuration, it is difficult to obtain the damping required for the dynamic absorber.

  An object of an embodiment of the present invention is made in consideration of the above-described circumstances, and is to provide a vibration damping device and a vibration damping method capable of damping vibrations by damping the vibration of a vibration damping target.

The damping device according to the embodiment of the present invention is provided to a mass body including a curved surface portion having a radius of curvature and a conductor portion including a conductor, and is provided for damping, and the curved surface portion of the mass body can swing. A damping device comprising: a mass support to be supported; and a magnet supported by the damping object to generate a magnetic flux, wherein the curved surface portion is supported by the mass support and the mass is shaken. When moving, the conductor portion of the mass body is disposed to pass the magnetic flux generated by the magnet, and the restoring force by the mass of the mass body, the radius of curvature of the curved surface portion, and the gravity is also the It is characterized in that it is configured to act on the mass .
Further, the damping device in the embodiment of the present invention is provided with a mass body provided with a conductor portion including a curved surface portion having a radius of curvature and a conductor, and is provided for damping, and swings the curved surface portion of the mass body. A vibration control device comprising: a mass support which supports the magnet; and a magnet supported by the vibration control target to generate a magnetic flux, wherein the curved surface portion of the conductor portion of the mass is the mass The magnetic body is disposed so as to pass the magnetic flux generated by the magnet when supported by a support and oscillated, and the mass body is provided with a conductor portion on the inner peripheral side, and is curved on the outer peripheral side of the conductor portion A portion is provided and configured, and a plurality of magnets with different magnetic poles are alternately arranged adjacent to each other below the conductor portion.
Furthermore, the vibration damping device according to the embodiment of the present invention is provided with a mass body including a curved surface portion having a radius of curvature and a conductor portion including a conductor, and is provided for damping, and swings the curved surface portion of the mass body. A vibration control device comprising: a mass support which supports the magnet; and a magnet supported by the vibration control target to generate a magnetic flux, wherein the curved surface portion of the conductor portion of the mass is the mass The magnetic body is disposed so as to pass through the magnetic flux generated by the magnet when supported by a support and oscillated, and the curved surface portion of the mass body is characterized in that the radius of curvature is different depending on the direction. It is a thing.
Further, the damping device in the embodiment of the present invention is provided with a mass body provided with a conductor portion including a curved surface portion having a radius of curvature and a conductor, and is provided for damping, and swings the curved surface portion of the mass body. A vibration control device comprising: a mass support which supports the magnet; and a magnet supported by the vibration control target to generate a magnetic flux, wherein the curved surface portion of the conductor portion of the mass is the mass The magnetic body is disposed so as to pass through the magnetic flux generated by the magnet when supported by a support and oscillated, and the conductor portions of the mass body are configured to have different thicknesses in the region from the inner side to the outer side in the radial direction It is characterized by the fact that

  According to the embodiment of the present invention, it is possible to damp and damp the oscillation of the damping target.

The side view showing the state where the dynamic absorber to which the damping device concerning a 1st embodiment was applied was installed in the seismic isolation subject which is a damping object. The side view which expands and shows the dynamic vibration damper of FIG. The top view which shows the dynamic vibration absorber of FIG. The sectional side view which shows the dynamic vibration damper of FIG. Explanatory drawing which shows the effect | action of the dynamic vibration damper of FIG. FIG. 7 is a side view showing a dynamic vibration absorber to which a damping device according to a second embodiment is applied. The top view which shows the mass body of the dynamic vibration damper of FIG. Explanatory drawing which shows the example of arrangement | positioning of the magnet of FIG. Explanatory drawing explaining the relationship between the magnetic flux line by the magnet of FIG. 6, and the conductor part of a mass body. The side sectional view showing the dynamic absorber to which the damping device concerning a 3rd embodiment was applied. The side sectional view showing an example of the dynamic absorber to which the damping device concerning a 4th embodiment was applied. The sectional side view which shows the other example of the dynamic vibration absorber to which the damping device concerning 4th Embodiment was applied. The mass body of the dynamic vibration damper to which the vibration damping device concerning 5th Embodiment was applied is shown, (A) is a top view, (B), (C) is each B arrow directional view of FIG. 13 (A), C Arrow view. The side sectional view showing the dynamic absorber to which the damping device concerning a 6th embodiment was applied. Explanatory drawing explaining the rocking | fluctuation condition of the seismic isolation target object supported by the up-and-down seismic isolation element.

Hereinafter, an embodiment for carrying out the present invention will be described based on the drawings.
[A] First Embodiment (FIGS. 1 to 5)
FIG. 1 is a side view showing a state in which a dynamic vibration absorber to which a vibration damping device according to the first embodiment is applied is installed on a seismic isolation object that is a vibration damping object. FIG. 2 is a side view showing the dynamic vibration absorber of FIG. 1 in an enlarged manner. The dynamic absorber 10 as a damping device shown in FIGS. 1 and 2 is installed on, for example, the top surface 1A of the seismic isolation target 1 as a damping target, and the oscillation of the seismic isolation target 1 is It is to be damped, and is configured to have a mass body 11, a mass body support 12, a magnet 13, a magnet support 14 and a substrate 15.

  Here, the seismic isolation object 1 as a vibration control object is softly supported with respect to the ground 3 using the vertical seismic isolation element 2, and the vertical acceleration response is reduced by the vertical seismic isolation element 2. However, the rocking vibration in the direction indicated by the arrow P, that is, the rocking, is suppressed by the dynamic vibration absorber 10. It should be noted that the vibration damping object that is damped by the dynamic vibration absorber 10 is not limited to the seismic isolation object 1, but also includes structures such as ships that float on the water surface and are swung by waves or wind.

  As shown in FIGS. 3 and 4, the mass body 11 is provided with a curved surface portion 16 on the inner peripheral side including the axis O and a conductor portion 17 on the outer peripheral side of the curved surface portion 16. Composed. The curved surface portion 16 and the conductor portion 17 are configured to be symmetrical with respect to the axis O by forming the curved surface portion 16 in a disk shape in plan view and the conductor portion 17 in a ring shape in plan view. . In particular, at least the lower surface 16A of the curved surface portion 16 is formed in a spherical shape, and the curvature radius R of each circumferential position of the lower surface 16A is set to the same value. The conductor portion 17 is formed of a conductor, and is continuously coupled to the curved surface portion 16 so as to extend outward in the radial direction of the mass body 11.

  The mass support 12 is in contact with the lower surface 16A of the curved surface 16 of the mass 11 as shown in FIGS. 2, 4 and 5, and the lower surface 16A of the curved surface 16 of the mass 11 is horizontally shaken. Support from below to be movable. For example, the mass body support 12 is configured such that the frictional resistance is reduced with respect to the horizontal displacement of the mass body 11, and specifically includes rollers such as a ball caster. Furthermore, the mass support 12 may support the mass 11 so as to be horizontally pivotable in a non-contact manner from below using an air spring or the like. The mass support 12 is mounted on the substrate 15 together with the magnet support 14, and the substrate 15 is attached to the top surface 1 A of the seismic isolation target 1. The mass support 12 is disposed below the curved surface portion 16 of the mass 11 on the substrate 15.

As shown in FIGS. 3 and 4, the magnet support 14 is installed on the substrate 15 at a plurality of positions in the circumferential direction of the conductor portion 17 of the mass body 11 at substantially equal intervals, and is fixed to the seismic isolation object 1. Also, the magnet 13 is supported by the seismic isolation target 1 via the magnet support 14. That is, a pair of magnets 13 of different magnetic poles, that is, a pair of magnets 13 of N and S poles, are disposed opposite to each other across the conductor portion 17 of the mass body 11 on the magnet support 14. Magnetic flux is generated between them.
The conductor portion 17 of the mass body 11 is disposed so as to pass (move across) the magnetic flux generated by the pair of magnets 13 when the mass body 11 shown in FIG. 5 swings in the horizontal direction. Here, the magnet support 14 is made of a magnetic material and functions as a yoke, and by forming a magnetic circuit by the magnet 13 and the magnet support 14, the magnetic flux density of the magnetic flux passing through the conductor portion 17 is increased. Yes.

  As shown in FIGS. 1, 2, and 5, when the seismic isolation object 1 swings in the direction of arrow P, the mass body 11 of the dynamic vibration absorber 10 moves to the seismic isolation object 1 along with this swinging. On the other hand, it is displaced relatively and swings in the horizontal direction. At this time, since the curved surface portion 16 of the mass body 11 has a radius of curvature R at each position in the circumferential direction, the mass body 11 functions as a pendulum by a restoring force F due to gravity G acting when displaced. Further, the conductor portion 17 of the mass body 11 passes (moves across) the magnetic flux formed by the pair of magnets 13. For this reason, on the principle of magnetic damping, a damping force proportional to the vibration (swinging) speed of the mass body 11 acts on the conductor portion 17 to attenuate the swinging of the mass body 11. As a result, the dynamic vibration absorber 10 functions as a pendulum type dynamic vibration absorber.

  In this dynamic vibration absorber 10, the natural frequency and damping ratio of the dynamic vibration absorber 10 are adjusted in order to adapt to the swing of the seismic isolation object 1. The natural frequency of the dynamic vibration absorber 10 is determined by the radius R of the curved surface portion 16 or the mass or moment of inertia of the mass 11. The damping ratio of the dynamic vibration absorber 10 is determined by the magnetic flux density generated by the magnet 13, the thickness of the conductor 17, the permeability of the conductor 17, the gap between the conductor 17 and the magnet 13, and the like.

Since it was comprised as mentioned above, according to 1st Embodiment, the following effects (1) and (2) are show | played.
(1) As shown in FIGS. 1 and 2, the mass body 11 of the dynamic vibration absorber 10 has a curved surface having a radius of curvature R at each position in the circumferential direction along with the rocking of the seismic isolation object 1 in the arrow P direction. The portion 16 is supported by the mass support 12 so that it can swing in all directions in the horizontal two-dimensional direction with respect to the seismic isolation target 1. At this time, when the conductor portion 17 of the mass body 11 passes the magnetic flux of the pair of magnets 13, a damping force acts on the conductor portion 17 according to the principle of magnetic attenuation, and the mass body 11 is attenuated. As a result, it is possible to damp and damp the oscillation of the seismic isolation target 1 in all directions in the horizontal two dimensions.

  (2) In the dynamic vibration absorber 10, the damping force is generated using the magnetic damping by the conductor portion 17 of the mass body 11 and the magnet 13, and the vibration isolation target 1 is damped. The damping ratio of the dynamic vibration absorber 10 necessary for the above can be ensured with a relatively simple configuration. That is, by changing the size of the magnet 13, the gap between the magnet 13 and the conductor 17, the thickness of the conductor 17, etc., for example, the magnetic flux density generated by the magnet 13 is adjusted, and the damping ratio of the dynamic vibration absorber 10 Can be ensured optimally.

[B] Second Embodiment (FIGS. 6 to 9)
FIG. 6 is a side view showing a dynamic vibration absorber to which the vibration damping device according to the second embodiment is applied. FIG. 7 is a plan view showing a mass of the dynamic vibration absorber of FIG. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals to simplify or omit the description.

  The dynamic vibration absorber 20 as the vibration damping device of the second embodiment is different from the first embodiment in that a conductor portion 23 is provided on the inner peripheral side portion including the axis O of the mass body 21, and this conductor portion 23. A curved surface portion 22 is provided on the outer periphery of the body, that is, on the outer peripheral side, and a mass body 21 is configured. Furthermore, a plurality of magnets 13 having different magnetic poles are alternately adjacent to a magnet support 24 installed below the conductor portion 23 It is the point arranged together.

  That is, the conductor part 23 of the mass body 21 is formed of a conductor and is formed in a circular shape in plan view. The curved surface portion 22 is coupled to the outer periphery of the conductor portion 13 and is formed in a ring shape in plan view. At least the lower surface 22A of the curved surface portion 22 is formed into a spherical shape, and the curved surface portion 22 has the curvature radius R of the same value at each circumferential position.

  In the mass body 21, the lower surface 22 </ b> A of the curved surface portion 22 is supported by the mass body support 12 from below. The mass support 12 is configured to have a low frictional resistance with respect to the curved surface 22, and may be, for example, a roller such as a ball caster contacting the lower surface 22 A of the curved surface 22. For example, a contact air spring. Since the lower surface 22A of the curved surface portion 22 has a radius of curvature R at each circumferential position, when the mass body 21 swings in the horizontal direction along with the swing of the seismic isolation object 1, this mass body 21 Functions as a pendulum.

  As in the first embodiment, the magnet 13 is supported by the seismic isolation object 1 via the magnet support 24, but the plurality of magnets 13 disposed on the magnet support 24 are as shown in FIG. The magnet 13 of the N pole and the magnet 13 of the S pole are alternately arranged in a horizontal state, whereby the magnetic flux lines 25 directed from the magnet 13 of the N pole to the magnet 13 of the S pole as shown in FIG. Is formed. The conductor portion 23 of the mass body 21 passes (moves across) the magnetic flux line 25 (magnetic flux) during the oscillation of the mass body 21 associated with the oscillation of the seismic isolation object 1, so that the conductor is formed according to the principle of magnetic attenuation. A damping force acts on the portion 23 to damp the mass body 21 and the oscillation of the seismic isolation target 1 is damped and damped.

  Since it was configured as described above, according to the second embodiment, in addition to the same effects as the effects (1) and (2) of the first embodiment, the following effect (3) is achieved.

  (3) Since the plurality of magnets 13 having different magnetic poles are alternately arranged adjacent to each other below the conductor portion 23 of the mass body 21, these magnets 13 are disposed only on one side of the conductor portion 23 become. For this reason, the magnetic flux of the magnetic flux lines 25 generated by these magnets 13 is smaller than that in the first embodiment, and the effect of the magnetic attenuation is lower than that in the first embodiment. The dynamic absorber 20 can be made compact because it can be made simpler than the magnet support 14 of the above.

[C] Third Embodiment (FIG. 10)
FIG. 10 is a side sectional view showing a dynamic vibration absorber to which the vibration damping device according to the third embodiment is applied. In the third embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals to simplify or omit the description.

  The dynamic vibration absorber 30 as the vibration damping device of the third embodiment is different from the first and second embodiments in that mass bodies 11 and 21 that move excessively upward as shown in FIGS. This is the point that an upward movement deterring body 31 that abuts and deters movement of the mass bodies 11 and 21 is provided.

  As shown in FIG. 10, the upward movement restraining body 31 protrudes toward the conductor portion 17 of the mass body 11 on the magnet support body 14 erected from the substrate 15 attached to the seismic isolation object 1. The Further, as shown by a two-dot chain line in FIG. 6, the upward movement restraining body 31 is projected from the mounting stay 32 erected on the substrate 15 toward the curved surface portion 22 of the mass body 21. These upward movement restraining bodies 31 are constituted by buffer members, and when the mass bodies 11 and 21 of the dynamic vibration absorber 30 are about to float up with respect to the mass support body 12 due to the vertical movement of the seismic isolation object 1. The mass bodies 11 and 21 are pressed against the mass bodies 11 and 21 to prevent the mass bodies 11 and 21 from being lifted up.

  Here, it is desirable that a gap is set between the upward movement suppressing body 31 and the mass bodies 11 and 21 so as not to hinder the movement (swing) of the mass bodies 11 and 21 in the horizontal direction. However, when the upward movement restraining body 31 and the mass bodies 11 and 21 are brought into contact with each other, the upward movement restraining body 31 is formed of a low friction material, and movement (rocking) of the mass bodies 11 and 21 is not inhibited. Is taken into account.

  With the configuration as described above, according to the third embodiment, in addition to the same effects as the effects (1) to (3) of the first and second embodiments, the following effect (4) is obtained. Play.

  (4) Since the upward movement deterring body 31 that abuts the mass bodies 11 and 21 that move excessively in the upward direction and deters the mass bodies 11 and 21 is provided, the mass body is also caused by the vertical movement of the seismic isolation object 1. 11 and 21 can be prevented from excessively moving upward, that is, lifting. As a result, since the mass bodies 11 and 21 are supported by the mass body support body 12 and can swing smoothly in the horizontal direction, the conductor portion 17 of the mass body 11 and the conductor portion 23 of the mass body 21 are The magnetic flux of the magnet 13 is reliably passed. As a result, the mass bodies 11 and 21 are attenuated by magnetic damping, so that the oscillation of the seismic isolation target 1 can be reliably suppressed.

[D] Fourth Embodiment (FIG. 11, FIG. 12)
FIG. 11 is a side sectional view showing an example of a dynamic vibration absorber to which the vibration damping device according to the fourth embodiment is applied. FIG. 12 is a side cross-sectional view showing another example of the dynamic vibration absorber to which the damping device according to the fourth embodiment is applied. In the fourth embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals to simplify or omit the description.

  The dynamic vibration absorber 40 as the vibration damping device of the fourth embodiment is different from the first and second embodiments in that the mass bodies 11 and 21 that are excessively moved in the horizontal direction are in contact with the mass bodies 11 and 21. It is a point provided with horizontal movement restraints 41, 42, 43 for suppressing movement.

  That is, the horizontal movement restraining body 41 is constituted by a buffer member, and the mass body 11 swings on the magnet support 14 erected from the substrate 15 attached to the seismic isolation object 1 as shown in FIG. It is installed with the longitudinal direction orthogonal to the horizontal direction. As a result, when the mass body 11 swings in the horizontal direction with an excessive amplitude, the mass body 11 abuts against the horizontal movement restraining body 41 and is buffered, and the drop from the mass body support 12 is prevented.

  Further, as shown in FIG. 12, the horizontal movement restraining body 42 is installed, for example, in a ring shape on the outside of the mass body side support member 44 suspended from the mass body 21. Further, the horizontal movement suppressing body 43 is installed in a ring shape, for example, inside the substrate side support member 45 erected on the substrate 15. These horizontal movement restraints 42 and 43 are both composed of buffer members, and when the mass 21 swings in the horizontal direction with excessive amplitude, this mass 21 is a horizontal movement restraint 42 on the mass 21 side. Is abutted against the horizontal movement restraining body 43 on the side of the substrate 15 so that the mass body 21 is prevented from falling from the mass body support 12. In the fourth embodiment, the upward movement restraining body 31 of the third embodiment may be juxtaposed.

  Since it was configured as described above, the fourth embodiment also provides the following effect (5) in addition to the same effects as the effects (1) to (3) of the first and second embodiments.

  (5) Since the horizontal movement deterring bodies 41, 42, and 43 that contact the mass bodies 11 and 21 that move excessively in the horizontal direction and deter the movement of the mass bodies 11 and 21 are provided, Since the mass body 11 abuts on the horizontal movement restraining body 42 and the mass body 21 abuts on the horizontal movement restraining body 43 via the horizontal movement restraining body 42 when 21 swings with an excessive amplitude, the mass body Excessive horizontal movement of 11, 21 is buffered and prevented. This prevents the mass bodies 11 and 21 from falling off the mass body support 12.

  As a result, the mass bodies 11 and 21 are supported by the mass body support 12 and can move (swing) smoothly in the horizontal direction, so that the conductor portion 17 of the mass body 11 and the conductor portion 23 of the mass body 21 are magnets 13. Surely passes through (moves across). For this reason, the mass bodies 11 and 21 are attenuated by magnetic damping, so that the oscillation of the seismic isolation target 1 can be reliably suppressed.

[E] Fifth embodiment (FIG. 13)
FIG. 13: shows the mass body of the dynamic vibration damper to which the damping device concerning 5th Embodiment was applied, (A) is a top view, (B), (C) is each B arrow of FIG. 13 (A). It is a view and C arrow view. In the fifth embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals to simplify or omit the description.

  The dynamic vibration reducer 50 as the vibration damping device of the fifth embodiment differs from that of the first embodiment in that at least the lower surface 52A of the curved surface portion 52 of the mass 51 is formed into an ellipsoidal surface shape. Is set differently depending on the circumferential direction of the curved surface portion 52, so that the natural frequency of the dynamic vibration absorber 50 is different depending on the swing direction of the mass body 51.

  That is, when the swing of the seismic isolation object 1 is stopped by the dynamic vibration absorber, the dynamic vibration absorber needs to adjust its natural frequency according to the vibration frequency of the vibration isolation object 1. . At this time, the seismic isolation target 1 does not necessarily have a symmetrical structure, so it may have so-called anisotropy of the frequency, in which the frequency is different depending on the rocking direction.

  In the dynamic vibration absorber 10 according to the first embodiment, the lower surface 16A of the curved surface portion 16 of the mass body 11 is formed into a spherical shape (surface shape of a sphere). It is constant at each position in the direction. Therefore, the natural frequency of the dynamic vibration absorber 10 is constant regardless of the direction of the dynamic vibration absorber 10, and the single dynamic vibration absorber 10 corresponds to the anisotropy of the vibration frequency of the seismic isolation object 1. I can't.

  On the other hand, in the dynamic vibration absorber 50 of the fifth embodiment, the lower surface 52A of the curved surface portion 52 of the mass body 51 is formed into an ellipsoidal surface shape, so this lower surface 52A is viewed with the longitudinal direction as the front. 13B, the radius of curvature is set to Rb, and C shown in FIG. 13C is orthogonal to the arrow B and is viewed with the short side direction of the lower surface 52A in front. In the arrow view, the curvature radius is set to Rc (Rc ≠ Rb). Therefore, the natural frequency of the dynamic vibration absorber 50 is set to a different value depending on the swing direction of the mass body 51. For this reason, it is possible for the dynamic vibration absorber 50 to correspond to the anisotropy of the frequency whose frequency is different depending on the swing direction of the seismic isolation target 1.

  Note that reference numeral 53 in FIG. 13 denotes a conductor portion that is coupled to the outer periphery of the curved surface portion 52 and is made of a conductor. Further, the fifth embodiment may be applied to the mass body 21 by forming the curved surface portion 22 of the mass body 21 (FIG. 6) of the second embodiment into an elliptical surface shape.

  Due to the above configuration, the fifth embodiment also provides the following effect (6) in addition to the same effects as the effects (1) to (3) of the first and second embodiments.

  (6) The radii of curvature Rb and Rc of the lower surface 52A of the curved surface 52 of the mass 51 are set differently depending on the direction of the curved surface 52, whereby the natural frequency of the dynamic vibration absorber 50 according to the swinging direction of the mass 51 Can be set differently. For this reason, even if the frequency of oscillation of the seismic isolation object 1 varies depending on the direction of oscillation, the lower surface of the curved surface portion 52 of the mass body 51 according to the frequency of oscillation of the seismic isolation object 1. By adjusting the curvature radius of 52A, even the single dynamic vibration absorber 50 can cope with the anisotropy of the oscillation frequency of the seismic isolation object 1, and the seismic isolation object 1 in different directions. Oscillation can be suitably controlled.

[F] Sixth Embodiment (FIG. 14)
FIG. 14 is a side sectional view showing a dynamic vibration absorber to which the vibration damping device according to the sixth embodiment is applied. In the sixth embodiment, the same parts as those in the first and second embodiments are denoted by the same reference numerals to simplify or omit the description.

  The dynamic vibration absorber 60 as the vibration damping device of the sixth embodiment is different from that of the first embodiment in that the conductor portion 62 of the mass body 61 is configured with different thicknesses from the inner side to the outer side in the radial direction. For example, the thickness Tb of the inner region 62B in the radial direction of the conductor 62 is set larger than the thickness Ta of the outer region 62A.

  Since the dynamic vibration absorber 60 uses magnetic attenuation by the conductor portion 62 and the magnet 13, the attenuation ratio of the dynamic vibration absorber 60 increases as the thickness of the conductor portion 62 increases. In the normal displacement region of the mass 61 where the outer region 62A of the conductor 62 passes the magnetic flux of the magnet 13, the mass 61 is magnetically attenuated so as to be optimal for vibration suppression of the seismic isolation object 1. The Further, in a displacement region where the mass 61 is displaced beyond the assumption, the inner region 62B of the conductor 62 passes the magnetic flux of the magnet 13 and a large damping force acts on the conductor 62, and this damping force Therefore, the displacement exceeding the assumption of the mass body 61 is suppressed.

  Note that reference numeral 63 in FIG. 14 denotes a curved surface portion that is continuously coupled to the conductor portion 62 inside the conductor portion 62. Also, the conductor portion 62 of the sixth embodiment may be formed such that its thickness gradually increases from the outer region portion 62A toward the inner region portion 62B. Furthermore, the sixth embodiment may be applied to the conductor portion 23 of the mass body 21 (FIG. 6) of the second embodiment by setting the outer region portion to be thicker than the inner region portion.

  As described above, according to the sixth embodiment, in addition to the same effects as the effects (1) to (3) of the first and second embodiments, the following effect (7) is obtained.

  (7) In the conductor portion 62 of the mass body 61, the inner region portion 62 </ b> B in the radial direction is configured to be thicker than the outer region portion 62 </ b> A. When the portion 62 </ b> B passes the magnet 13, the increase in damping force acting on the conductor portion 62 can suppress the displacement exceeding the assumption of the mass 61. As a result, similarly to the horizontal movement deterring bodies 41, 42 and 43 of the fourth embodiment, the mass body 61 is prevented from dropping from the mass body support body 12, and the vibration isolator 60 is used to control the seismic isolation object 1. The effect can be ensured and the dynamic vibration absorber 60 can be prevented from being damaged.

  While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, changes can be made without departing from the scope of the invention, and those replacements or changes can be made. Is included in the scope and gist of the invention, and is included in the invention described in the claims and the equivalents thereof. For example, the curved surface portion in each embodiment described above may be formed of the same material (conductor) as the conductor portion, and the curved surface portion and the conductor portion may be integrated.

DESCRIPTION OF SYMBOLS 1 ... Seismic isolation object (damping object), 10 ... Dynamic vibration absorber (vibration control apparatus), 11 ... Mass body, 12 ... Mass body support, 13 ... Magnet, 14 ... Magnet support, 16 ... Curved surface part, DESCRIPTION OF SYMBOLS 17 ... Conductor part, 20 ... Dynamic vibration absorber (damping device), 21 ... Mass body, 22 ... Curved surface part, 23 ... Conductor part, 24 ... Magnet support body, 30 ... Dynamic vibration absorber (vibration damping device), 31 ... Upper movement suppression body, 40 ... dynamic vibration absorber (vibration control device), 41, 42, 43 ... horizontal movement suppression body, 50 ... dynamic vibration absorber (vibration suppression device), 51 ... mass body, 52 ... curved surface portion, 60 ... Dynamic absorber (vibration damping device) 61 mass body 62 conductor portion 62A outer region portion 62B inner region portion O central axis

Claims (9)

A mass body provided with a curved surface portion having a radius of curvature and a conductor portion consisting of a conductor;
A mass support which is provided for damping and which swingably supports the curved surface portion of the mass;
And a magnet supported by the vibration control target to generate a magnetic flux.
When the curved surface portion is supported by the mass support and the mass oscillates, the conductor portion of the mass is disposed to pass the magnetic flux generated by the magnet , and the mass A damping device characterized in that a restoring force due to a mass of a body, a radius of curvature of the curved surface portion, and gravity acts on the mass body . The mass body is configured such that a curved surface portion is provided on the inner peripheral side and a conductor portion is provided on the outer peripheral side of the curved surface portion, and a pair of magnets having different magnetic poles are provided at a plurality of circumferential positions of the conductor portion. The vibration damping device according to claim 1, wherein the vibration damping device is disposed so as to face each other. The mass body is configured such that a conductor portion is provided on the inner circumferential side and a curved surface portion is provided on the outer circumferential side of the conductor portion, and a plurality of magnets of different magnetic poles are alternately arranged below the conductor portion. The vibration damping device according to claim 1, wherein the vibration damping device is disposed on the surface. A mass body provided with a curved surface portion having a radius of curvature and a conductor portion consisting of a conductor;
A mass support which is provided for damping and which swingably supports the curved surface portion of the mass;
And a magnet supported by the vibration control target to generate a magnetic flux.
The conductor portion of the mass body is disposed to pass the magnetic flux generated by the magnet when the curved surface portion is supported by the mass body support and oscillated.
The mass body is configured such that a conductor portion is provided on the inner circumferential side and a curved surface portion is provided on the outer circumferential side of the conductor portion, and a plurality of magnets of different magnetic poles are alternately arranged below the conductor portion. The vibration control device is characterized in that it is disposed at . Curved surface portion of the mass body, vibration damping device according to any one of claims 1 to 4, characterized in that the radius of curvature is set differently depending on the direction. Conductor portion of the mass body, vibration damping device according to any one of claims 1 to 5, characterized in that its thickness from the inside in the outer area in the radial direction is differently configured. A mass body provided with a curved surface portion having a radius of curvature and a conductor portion consisting of a conductor;
A mass support which is provided for damping and which swingably supports the curved surface portion of the mass;
And a magnet supported by the vibration control target to generate a magnetic flux.
The conductor portion of the mass body is disposed to pass the magnetic flux generated by the magnet when the curved surface portion is supported by the mass body support and oscillated.
The curved surface portion of the mass body has a radius of curvature set differently depending on a direction . A mass body having a curved surface portion having a radius of curvature and a conductor portion made of a conductor;
  A mass body support that is provided on a vibration control target and that swingably supports the curved surface portion of the mass body;
  A damping device comprising a magnet that generates a magnetic flux supported by the damping target,
  The conductor portion of the mass body is disposed so as to pass the magnetic flux generated by the magnet when the curved surface portion is supported by the mass body support and swings.
  The vibration control device is characterized in that the conductor portion of the mass body is formed to have different thicknesses in the region from the inner side to the outer side in the radial direction. A vibration control method characterized in that the vibration control device according to any one of claims 1 to 8 controls the vibration control object.

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