Vibration control mechanism

Abstract

To easily manufacture a vibration control mechanism capable of restraining vibration of a damping object structure.SOLUTION: A damping device D has: a vibrator D1 comprising an arm part 11 installed so as to be erected on an upper face of a damping object structure S and vibrated while rotating on the damping object structure S side as a fulcrum, and a mass body 12 mounted to the arm part 11; first and second tension coil springs D2a, D2b locked to the arm part 11 so that they are at positions opposite to each other across the arm part 11 in a direction coincident with a vibration face of the arm part 11, and having the same spring constant; first and second lock members D3a, D3b for locking other ends of the first and second tension coil springs D2a, D2b; a magnet 41 installed to the arm part 11 while a direction of a magnetic flux is a vibration direction of the arm part 11; and first and second magnet holding parts 42a, 42b installed at positions opposite to each other across the arm part 11, and restraining a vibration with of the arm part 11 by repulsion of the magnet.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vibration control mechanism for suppressing vibrations occurring in a target structure. [Background technology]

[0002] For example, in structures (structures to be controlled) that are constructed horizontally, such as beam- or plate-like structures like bridges that allow roads and railways to pass over land obstacles, rivers, valleys, or the sea, or that are constructed vertically, such as high-rise buildings, the period of shaking during earthquakes or strong winds is long, and the shaking continues for some time even after the earthquake or strong winds have subsided.

[0003] Therefore, vibrations are controlled by installing vibration control means on the target structure. This device installs a vibrating body, which has an auxiliary mass attached via an arm that can vibrate with the target structure as a fulcrum, on the target structure, so that the vibrating body vibrates in a way that takes over the vibrations of the structure, thereby suppressing the resonance phenomenon around the natural frequency of the target structure.

[0004] Specifically, by installing vibration control means in which the direction of vibration of the vibrating body is perpendicular to the direction of vibration of the structure to be vibration-controlled and the vibration period of the vibrating body is half the natural period of the structure to be vibration-controlled, it becomes possible to reduce the vibration of the structure to be vibration-controlled.

[0005] In addition, technology for reducing vibrations of a structure to be damped using a vibration damping means that halves the vibration period of the vibrating body relative to the natural period of the structure to be damped is described in detail, for example, in Patent Publication No. 2020-148339. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2020-148339 Summary of the Invention [Problem to be solved by the invention]

[0007] One possible solution is to use a structure in which the vibrating body constituting the vibration control means vibrates using a leaf spring. However, in order to add a mass to a vibrating body with a leaf spring structure so that the natural period of the target structure is 1 / 2 the natural period, the leaf spring must have both sufficient strength and the necessary flexibility, and it is expected that a great deal of trial and error will be required in selecting the dimensions and material of the leaf spring.

[0008] In particular, when the structure to be damped is a large-scale structure, the leaf spring vibrating body and the mass added to the vibrating body will be large, making manufacturing difficult.

[0009] The present invention has been made in light of the above-mentioned technical background, and aims to provide a vibration control mechanism that can easily manufacture vibration control means that have a half-cycle period relative to the natural frequency of the structure to be vibration-controlled. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, a vibration control mechanism of the present invention as set forth in claim 1 comprises a target structure to be damped that is constructed in a horizontal direction and has a predetermined natural frequency (f), and vibration control means that is installed on the target structure to be damped and is capable of vibrating in a direction intersecting the vibration direction of the target structure to be damped and has a natural frequency (f / 2) that is half the natural frequency (f) of the target structure to be damped, wherein the vibration control means comprises a vibrating body that has an arm section that is installed upright on the upper surface of the target structure to be damped and is capable of vibrating laterally around a pivot shaft that is provided on the target structure to be damped as a fulcrum, and a mass body attached to the arm section at the position of its center of gravity, a first tension coil spring and a second tension coil spring that have the same spring constant and one end of which is engaged with the arm section in a direction that coincides with the vibration plane of the arm section and at positions opposite to each other across the arm section, and a magnet attached to the arm with its magnetic flux oriented in the vibration direction of the arm; and a first magnet holder and a second magnet holder, which are respectively arranged in a direction that coincides with the vibration plane of the arm and on opposite sides of the arm, and which hold the magnet so that the magnetic poles facing the magnet in the arm are the same polarity, thereby regulating the vibration amplitude of the arm by the repulsion of the magnets; the distance between the locking position of the arm on the first tension coil spring and the locking position of the first locking member and the distance between the locking position of the arm on the second tension coil spring and the locking position of the second locking member are set to be equal, and the gap between the magnet in the arm and the magnet in the first magnet holder and the gap between the magnet in the arm and the magnet in the second magnet holder are equal when the arm is oriented perpendicular to the installation surface of the target vibration-damping structure.

[0011] The vibration control mechanism of the present invention described in claim 2 is characterized in that, in the invention described in claim 1 above, the structure to be damped is a beam-like or plate-like structure extending horizontally, and the vibration control means is installed on the upper surface of the structure to be damped to suppress vertical vibrations of the structure to be damped.

[0012] The vibration control mechanism of the present invention described in claim 3 is characterized in that, in the invention described in claim 2 above, the structure to be damped has a double-supported structure supported at both ends, and the vibration control means has the arm portion installed at a central position between the support positions at both ends of the structure to be damped.

[0013] The vibration control mechanism of the present invention described in claim 4 is characterized in that, in the invention described in claim 2 above, the structure to be controlled has a cantilever structure supported at only one end, and the vibration control means is installed at the free end opposite to the one end of the structure to be controlled.

[0014] The vibration control mechanism of the present invention described in claim 5 is characterized in that, in the invention described in claim 1 above, the structure to be damped is a tower-shaped structure, and the vibration control means is installed facing upward on the horizontal surface of the structure to be damped to suppress horizontal vibration of the structure to be damped.

[0015] The vibration control mechanism of the present invention as set forth in claim 6 is the invention as set forth in claim 5, characterized in that the vibration control means is installed at the top of the structure to be vibration-controlled.

[0016] In order to solve the above problems, a vibration control mechanism of the present invention as set forth in claim 7 comprises a target structure to be damped that is constructed in the vertical direction and has a predetermined natural frequency (f), and vibration control means that is installed on the target structure to be damped and is capable of vibrating in a direction intersecting the vibration direction of the target structure to be damped and has a natural frequency (f / 2) that is half the natural frequency (f) of the target structure to be damped, wherein the vibration control means comprises a vibrating body that includes an arm portion that is installed horizontally on a side of the target structure to be damped and is capable of vibrating in the vertical direction or the horizontal direction around a rotation axis provided on the target structure side as a fulcrum, and a mass body attached to the arm portion at the center of gravity, a first tension coil spring and a second tension coil spring that have the same spring constant and one end of which is engaged with the arm portion in a direction that coincides with the vibration plane of the arm portion and at positions opposite to each other across the arm portion, and a vibration control means that engages the other ends of the first tension coil spring and the second tension coil spring to control the vibration the distance between the locking position of the arm on the first tension coil spring and the locking position of the first locking member and the distance between the locking position of the arm on the second tension coil spring and the locking position of the second locking member are set to be equal, and the distance between the magnet of the arm on the first tension coil spring and the magnet of the first magnet holder and the magnet of the arm on the second tension coil spring are set to be equal, and the distance between the magnet of the arm on the first magnet holder and the magnet of the arm on the second magnet holder are equal when the arm on the first tension coil spring is set to be equal to the distance between the magnet of the arm on the first tension coil spring and the magnet of the first magnet holder and the magnet of the arm on the second magnet holder are set to be equal when the arm on the first tension coil spring is set to be perpendicular to the installation surface of the vibration-damping target structure.

[0017] The vibration control mechanism of the present invention described in claim 8 is characterized in that, in the invention described in claim 7 above, the structure to be damped is a tower-shaped structure, and the vibration control means is installed on the side of the structure to be damped to suppress horizontal or vertical vibrations of the structure to be damped.

[0018] The vibration control mechanism of the present invention as set forth in claim 9 is characterized in that, in the invention as set forth in claim 8, the vibration control means is installed on the upper side surface of the structure to be vibration-controlled. [Effects of the Invention]

[0019] According to the present invention, the arm is attached to the target structure so that it can rotate around a pivot point provided on the target structure, and vibrates around the pivot point. The arm also autonomously returns to its origin due to the spring force of the tension coil spring. This eliminates the need for extensive consideration of the dimensions and material selection of the arm, making it easy to manufacture a vibration control device with a half-cycle frequency for the target structure's natural frequency. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic diagram showing an installation mode of a vibration damping mechanism according to an embodiment of the present invention on a target structure to be damped; [Figure 2] 1 is an explanatory diagram showing the structure of a vibration damping mechanism according to an embodiment of the present invention; [Figure 3] 10 is a graph showing the relationship between the tension coil spring and the deflection angle of the vibrating body. [Figure 4] 2 is a schematic diagram showing an example of an installation mode of a vibration control mechanism according to an embodiment of the present invention on a vibration control target structure different from that shown in FIG. 1. [Figure 5] 1. FIG. 4 is a schematic diagram showing another example of an installation mode of a vibration control mechanism according to an embodiment of the present invention on a vibration control target structure different from that shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings for explaining the embodiment, the same components are generally designated by the same reference numerals, and repeated description thereof will be omitted.

[0022] Fig. 1 is a schematic diagram showing an installation mode of a vibration control mechanism according to an embodiment of the present invention on a target structure to be vibration-controlled. As shown in Fig. 1, a vibration control device (vibration control means) D constituting the vibration control mechanism of this embodiment is installed on the upper surface of a target structure S to be vibration-controlled, which is a beam-like or board-like structure constructed horizontally, such as a bridge, which is an aerial structure built to allow roads, railways, etc. to pass over land obstacles, rivers, valleys, seas, etc., and has the function of suppressing vertical vibrations of the target structure S to be vibration-controlled.

[0023] The vertical vibration of the target structure S to be damped is caused by strong winds due to earthquakes or typhoons, and in the case of bridges, by vehicles or trains passing over the bridge. These vertical vibrations have long periods of vibration, and continue for some time even after the earthquake or strong winds have subsided or after vehicles have passed. The vibration damping device D of this embodiment suppresses such long-period vibrations.

[0024] As shown in FIG. 2, the vibration damping device D of this embodiment for suppressing the up-and-down vibration of a target structure S for vibration damping includes a vibrating body D1, a tension coil spring D2, a locking member D3, and a swing angle restricting member D4.

[0025] 2, vibrating body D1 comprises an arm 11 that is installed upright on the top surface of the target structure S to be damped and vibrates around the target structure S as a fulcrum, and a mass body 12 attached to arm 11. As shown in the figure, mass body 12 is attached to arm 11 at the center of gravity. Arm 11 is attached to mounting base 13 that is fixed to the target structure S to be damped so that it can rotate about pivot 14. This allows arm 11, which is installed upright, to vibrate laterally around pivot 14 as a fulcrum.

[0026] The tension coil spring D2 is made up of a first tension coil spring D2a and a second tension coil spring D2b, each of which has one end engaged with the arm portion 11 in a direction that coincides with the vibration plane of the arm portion 11 and at positions opposite each other across the arm portion 11. The first tension coil spring D2a and the second tension coil spring D2b have the same spring constant, and are engaged by having one end hooked onto hooks 11a-1 provided on both sides of a large diameter portion 11a that constitutes part of the arm portion 11.

[0027] The locking members D3 are a first locking member D3a and a second locking member D3b provided on the first tension coil spring D2a and the second tension coil spring D2b, respectively, on the opposite side of the arm portion 11. The other end of the first tension coil spring D2a is locked to the first locking member D3a, and the other end of the second tension coil spring D2b is locked to the second locking member D3b.

[0028] As shown in the figure, the locking member D3 is composed of a bracket 31 fixed to the target structure S to be damped, a bolt 32 attached by passing through the bracket 31, a nut 33 screwed onto the bolt 32 so as to sandwich the bracket 31 from both sides, and a locking tool 34 attached to the end of the arm portion 11 of the bolt 32 and provided with a hook 34-1 on which the other end of the tension coil spring D2 is hooked. Then, the bolt 32 is fixed to the bracket 31 by the nut 33 sandwiching the bracket 31 from both sides.

[0029] In this way, the nut 33 threaded onto the bolt 32 sandwiches the bracket 31 from both sides, so that by adjusting the threaded position of the bolt 32 and the nut 33, the protruding length of the bolt 32 toward the arm portion 11 when fixed to the bracket 31 can be freely set.

[0030] 1, the length of protrusion of the bolt 32 from the first locking member D3a toward the arm portion 11 is the same as the length of protrusion of the bolt 32 from the second locking member D3b toward the arm portion 11. In other words, the distance between the locking position of the first tension coil spring D2a with respect to the arm portion 11 (the position of the hook 11a-1 on which the first tension coil spring D2a is hooked) and the locking position of the first locking member D3a (the position of the hook 34-1 on which the first tension coil spring D2a is hooked) is the same as the distance between the locking position of the second tension coil spring D2b with respect to the arm portion 11 (the position of the hook 11a-1 on which the second tension coil spring D2b is hooked) and the locking position of the second locking member D3b (the position of the hook 34-1 on which the second tension coil spring D2b is hooked). As described above, the first tension coil spring D2a and the second tension coil spring D2b have the same spring constant, and therefore are pulled with the same strength. Therefore, the vibrating body D1 placed on the upper surface of the target vibration damping structure S is held upright perpendicular to the installation surface by the first tension coil spring D2a and the second tension coil spring D2b.

[0031] The oscillation angle restricting member D4 has a function of restricting the oscillation angle of the vibrating body D1 to a predetermined angle.

[0032] 3, the restoring force F of the tension coil spring D2 does not significantly affect the period of the vibrating body D1 when the vibrating body D1 does not oscillate significantly (when the oscillation angle θ of the vibrating body D1 is within a predetermined range). However, as the oscillation angle θ of the vibrating body D1 increases, the restoring force F of the tension coil spring D2 weakens, resulting in a longer period of the vibrating body D1.

[0033] Therefore, a swing angle restricting member D4 is added to restrict the swing angle θ of the vibrating body D1 to a predetermined angle and to suppress the occurrence of nonlinear mechanical components in the restoring force F of the tension coil spring D2 that expands when the vibrating body D1 swings.

[0034] 2, the swing angle limiting member D4 includes a magnet 41 that is installed on the arm 11 with the direction of magnetic flux facing the vibration direction of the arm 11 (i.e., with both poles of the magnet facing the vibration direction of the arm 11), and a first magnet holder 42a and a second magnet holder 42b that are installed in a direction that coincides with the vibration plane of the arm 11 and on opposite sides of the arm 11. The first magnet holder 42a and the second magnet holder 42b hold magnets 43a and 43b so that the magnetic poles facing the magnet 41 installed on the arm 11 are the same polarity (for example, if the magnetic pole facing the first magnet holder 42a of the magnet 41 installed on the arm 11 is an S pole, the first magnet holder 42a holds the magnet 43a so that the S pole faces the magnet 41), and the repulsion between the magnets limits the vibration amplitude of the arm 11.

[0035] As shown in the figure, the first magnet holder 42a and the second magnet holder 42b are attached to the arm portion 11 side end of a bolt 44 that is attached by passing through the bracket 31. A nut 45 for fixing the bolt 44 to the bracket 31 is screwed onto the bolt 44. By adjusting the screwing position of the bolt 44 and the nut 45, the length of protrusion of the bolt 44 toward the arm portion 11 when fixed to the bracket 31 is made equal. As a result, the distance between the magnet 41 of the arm portion 11 and the magnet 43a of the first magnet holder 42a and the distance between the magnet 41 of the arm portion 11 and the magnet 43b of the second magnet holder 42b are equal when the vibrating body D1 of the arm portion 11 is upright perpendicular to the installation surface.

[0036] By providing such a swing angle restricting member D4, the swing angle θ of the vibrating body D1 is restricted to a predetermined angle by the repulsion between the magnets, and the occurrence of a nonlinear mechanical component in the restoring force F of the tension coil spring D2 that extends when the vibrating body D1 swings is suppressed. This prevents the restoring force F of the tension coil spring D2 from weakening and the period of the vibrating body D1 from becoming longer.

[0037] In the vibration control device D having the structure described above, when the target structure S, which is constructed to extend horizontally, begins to vibrate up and down, the vibrating body D1 begins to oscillate. Then, by setting the natural frequency generated by the vibration of the arm portion 11 to half the natural frequency of the target structure S, as will be described later, the vertical vibration of the target structure S is suppressed.

[0038] It is desirable to install the vibration control device D in a location where the vibration of the target structure S is at its maximum. In other words, if the target structure S has a doubly supported structure (a structure supported at both ends), the vibration control device D is installed so that the vibrating body D1 is located at the center of the support positions at both ends of the target structure S, and if it has a cantilevered structure (a structure supported at only one end), the vibration control device D is installed at the free end opposite the supported end. In this embodiment, it is assumed that the target structure S is doubly supported, and the vibration control device D is attached so that the vibrating body D1 is located at the center of the two support positions of the target structure S.

[0039] The target structure S has a predetermined natural frequency (f), and the vibration control device D installed on this target structure S has a natural frequency (f / 2) that is half the natural frequency (f) of the target structure S. The natural frequency of the vibration control device D can be set to f / 2 by adjusting the effective length of the arm portion 11 (the distance between the center of the mass body 12 and the rotation axis 14). In other words, by moving the mass body 12 to a predetermined position on the arm portion 11, the effective length of the arm portion 11 is changed, and the frequency of the vibration control device D is set to f / 2.

[0040] In this application, the natural frequency (f / 2) of the vibration control device D does not mean a natural frequency that is exactly half the natural frequency of the vibration-control target structure S (in other words, a natural frequency that is the value obtained by multiplying the natural frequency f of the vibration-control target structure S by 0.5), but rather a natural frequency that is approximately half the natural frequency of the vibration-control target structure S. This is because, although the vibration control effect of the vibration-control target structure S becomes extremely large when the natural frequency of the vibration control device D is exactly half the natural frequency of the vibration-control target structure S, an effective vibration control effect can be obtained even if it is not exactly half.

[0041] Here, if the arm portion of the vibrating body is designed to vibrate using a leaf spring, it is likely that a lot of trial and error will be required in selecting the dimensions and materials in order to give the leaf spring to which mass body 12 is attached both sufficient strength and the necessary flexibility.

[0042] In contrast, the arm portion 11 of this embodiment is rotatably attached to a mounting base 13 fixed to the target structure S by a rotation shaft 14, and is installed upright on the upper surface of the target structure S so as to vibrate around the rotation shaft 14 provided on the target structure S side. The arm portion 11 also autonomously returns to the origin (upright state) by the spring force of the tension coil spring D2. Therefore, unlike the case of a leaf spring structure, the strength and flexibility of the leaf spring itself do not become an issue, and extensive consideration is not required regarding the dimensions and material selection of the arm portion 11. This makes it possible to easily manufacture a vibration damping device D that has a half-cycle frequency of the natural frequency of the target structure S.

[0043] The invention made by the inventor has been specifically described above based on the embodiments, but the embodiments disclosed in this specification are illustrative in all respects and are not limited to the disclosed technology. In other words, the technical scope of the present invention should not be interpreted restrictively based on the description of the above embodiments, but should be interpreted solely in accordance with the claims, and includes technologies equivalent to the technologies described in the claims and all modifications that do not deviate from the gist of the claims.

[0044] For example, in this embodiment, a beam- or board-like structure constructed horizontally is taken as the target structure S to be damped, and the vibration control device D is installed on the top surface of the target structure S to be damped in order to suppress vertical sway (up and down vibration). However, the target structure S may be a tower-like structure such as a mid- to high-rise building or a mid- to high-rise apartment building, and the vibration control device D may be installed facing upward on the horizontal surface of the target structure S to be damped in order to suppress lateral sway (horizontal vibration). Note that, since tower-like structures tend to sway more significantly at higher points, it is desirable to install the vibration control device D on the top of the target structure S to be damped.

[0045] Furthermore, when the target structure S is a tower-like structure, the vibrating body D1 of the vibration control device D may be installed horizontally on the side of the target structure S (FIGS. 4 and 5). When installed in this manner, the vibrating body D1 is pulled from both sides by a first tension coil spring D2a and a second tension coil spring D2b and held horizontally. When installing the vibrating body D1 on the side of the target structure S, two possible installations are possible: one in which the arm portion 11 is installed so that it can vibrate in the vertical direction, as shown in FIG. 4; and one in which the arm portion 11 is installed so that it can vibrate horizontally, as shown in FIG. 5. The former installation mode can suppress lateral vibration (horizontal vibration) of the tower-like structure, which is the target structure S, while the latter installation mode can suppress lateral vibration (horizontal vibration) and vertical vibration (vertical vibration) of the tower-like structure, which is the target structure S. Furthermore, when the target structure S to be vibration-controlled is a tower-like structure, as mentioned above, higher parts tend to shake more greatly, so it is desirable to install the vibration control device D on the upper side of the target structure S to be vibration-controlled. [Industrial Applicability]

[0046] In the vibration control mechanism of the present invention, the target structure to be damped is not limited to structures that experience vertical vibration (up-down vibration), but can also be applied to tower-like structures that experience lateral vibration (horizontal vibration), such as mid- to high-rise buildings and mid- to high-rise apartment buildings. Furthermore, the target structure to be damped can also be various structures other than buildings that require vibration suppression, such as elevators and plants that experience vibration. [Explanation of symbols]

[0047] 11 Arm section 11a Large diameter part 11a-1 hook 12 mass body 13 Mounting base 14 Rotating shaft 31 Bracket 32 volts 33 Nut 34 Locking device 34-1 Hook 41 Magnet 42a First magnet holder 42b Second magnet holder 43a, 43b Magnet 44 volts 45 Nut D. Vibration control device (vibration control means) D1 vibrating body D2 tension coil spring D2a First tension coil spring D2b Second tension coil spring D3 Locking member D3a First locking member D3b Second locking member D4 Swing angle control member S Structure to be controlled

Claims

1. A vibration-controlled structure constructed horizontally and having a predetermined natural frequency (f); a vibration control means that is installed on the target structure, is capable of vibrating in a direction intersecting the vibration direction of the target structure, and has a natural frequency (f / 2) that is half the natural frequency (f) of the target structure, The vibration damping means is a vibrating body including an arm portion that is installed upright on the upper surface of the vibration-damping target structure and that can vibrate laterally around a pivot shaft provided on the vibration-damping target structure side as a fulcrum, and a mass body that is attached to the arm portion at the center of gravity; a first tension coil spring and a second tension coil spring, one ends of which are engaged with the arm portion in a direction coinciding with the vibration plane of the arm portion and at positions opposite to each other across the arm portion, the first tension coil spring and the second tension coil spring having the same spring constant; a first locking member and a second locking member that lock the other ends of the first tension coil spring and the second tension coil spring, respectively, to hold the vibrating body in an upright state; a magnet disposed on the arm portion such that the direction of magnetic flux is oriented in the vibration direction of the arm portion; a first magnet holder and a second magnet holder, which are respectively installed in a direction coinciding with the vibration plane of the arm portion and at positions opposite to each other with the arm portion in between, and which hold a magnet such that magnetic poles facing the magnet of the arm portion are of the same polarity, thereby regulating the vibration amplitude of the arm portion by the repulsion of the magnets; a distance between a locking position of the arm portion of the first tension coil spring and a locking position of the first locking member is set to be equal to a distance between a locking position of the arm portion of the second tension coil spring and a locking position of the second locking member, The distance between the magnet of the arm portion and the magnet of the first magnet holder, and the distance between the magnet of the arm portion and the magnet of the second magnet holder are arranged at equal intervals when the arm portion is perpendicular to the installation surface of the target vibration-damping structure. A vibration damping mechanism characterized by:

2. The target structure to be damped is a beam-like or board-like structure extending horizontally, the vibration damping means is installed on the upper surface of the vibration-damping target structure to suppress vertical vibration of the vibration-damping target structure; 2. The vibration damping mechanism according to claim 1.

3. The target structure to be damped has a double-supported structure supported at both ends, The vibration damping means is arranged such that the arm portion is installed at a center position between support positions at both ends of the target structure.

3. The vibration damping mechanism according to claim 2.

4. The target structure to be damped has a cantilever structure supported only at one end, The vibration damping means is installed at a free end opposite to the one end of the vibration damping target structure.

3. The vibration damping mechanism according to claim 2.

5. the vibration-damping target structure is a tower-like structure, the vibration control means is installed facing upward on the horizontal surface of the vibration control target structure to suppress horizontal vibration of the vibration control target structure; 2. The vibration damping mechanism according to claim 1.

6. The vibration control means is installed on the top of the target structure.

6. The vibration damping mechanism according to claim 5.

7. A vibration-damping target structure constructed in the vertical direction and having a predetermined natural frequency (f); a vibration control means that is installed on the target structure, is capable of vibrating in a direction intersecting the vibration direction of the target structure, and has a natural frequency (f / 2) that is half the natural frequency (f) of the target structure, The vibration damping means is a vibrating body including an arm portion that is installed horizontally on a side surface of the target structure and that can vibrate vertically or horizontally around a pivot shaft provided on the target structure side as a fulcrum, and a mass body that is attached to the arm portion at the center of gravity; a first tension coil spring and a second tension coil spring, one ends of which are engaged with the arm portion in a direction coinciding with the vibration plane of the arm portion and at positions opposite to each other across the arm portion, the first tension coil spring and the second tension coil spring having the same spring constant; a first locking member and a second locking member that lock the other ends of the first tension coil spring and the second tension coil spring, respectively, to hold the vibrating body horizontally; a magnet disposed on the arm portion such that the direction of magnetic flux is oriented in the vibration direction of the arm portion; a first magnet holder and a second magnet holder, which are respectively installed in a direction coinciding with the vibration plane of the arm portion and at positions opposite to each other with the arm portion in between, and which hold a magnet such that magnetic poles facing the magnet of the arm portion are of the same polarity, thereby regulating the vibration amplitude of the arm portion by the repulsion of the magnets; a distance between a locking position of the arm portion of the first tension coil spring and a locking position of the first locking member is set to be equal to a distance between a locking position of the arm portion of the second tension coil spring and a locking position of the second locking member, The distance between the magnet of the arm portion and the magnet of the first magnet holder, and the distance between the magnet of the arm portion and the magnet of the second magnet holder are arranged at equal intervals when the arm portion is perpendicular to the installation surface of the target vibration-damping structure. A vibration damping mechanism characterized by:

8. the vibration-damping target structure is a tower-like structure, the vibration damping means is installed on a side surface of the target structure to be damped and suppresses horizontal vibration or vertical vibration of the target structure; 8. The vibration damping mechanism according to claim 7.

9. The vibration control means is installed on the upper side surface of the vibration control target structure.

9. The vibration damping mechanism according to claim 8.

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