JP2010174987A - Vibration control device and great wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure damping capacity of required vibration while making a vibration control device body compact. <P>SOLUTION: The vibration control device 1 includes a pair of vibration-damping bodies 10. The pair of vibration-damping bodies 10 are attached to vibration-damping object via a vibration input member 11. The vibration-damping bodies 10 is composed by intersecting a visco-elastic body 14 by a pair of spring members 13 oppositely disposed. In addition, the pair of spring member 13 composing the vibration-damping bodies 10 are coupled by a bolt 12B and a nut 12N at its one end portion T1 side to each other and coupled by a bolt 16B and a nut 16N at its other end portion T2 to each other. The vibration input member 11 is attached to the vibration-damping bodies 10 via the bolt 12B and the nut 12N and then transmits vibration from a wire 100 to the vibration-damping bodies 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration damping device that suppresses vibration of a structure.

  Known countermeasures against cable vibration include fixed fixing dampers and stock bridge dampers, which are widely put into practical use and commercialized. However, these dampers do not have a frequency adjustment function and cannot flexibly cope with the vibration control target frequency. For example, the fixing unit-fixed damper needs to be changed from the structure of the cable fixing unit, and a large-scale construction is required for an existing cable. In addition, since it is installed in the cable fixing unit having a small mode regardless of the vibration mode of the cable to be controlled, the effect of imparting attenuation is small with respect to the scale of the fixing unit fixed damper.

  Since the stock bridge damper has no vibration suppressing function other than absorbing vibration energy by strand friction loss due to bending or twisting of a steel stranded wire, there is a limit in improving the vibration damping effect. The stock bridge damper is highly dependent on the damping effect due to the vibration amplitude of the cable. When the cable vibration amplitude increases, the weight swings greatly and the steel stranded wire is bent violently. For this reason, as for a stock bridge damper, a steel twisted wire tends to get tired.

  As a vibration damping device having a frequency adjustment function, a cantilever leaf spring type dynamic vibration absorber is known. For example, in Patent Document 1, one end of two or more leaf springs arranged at a predetermined interval on a surface perpendicular to the vibration direction to be controlled is fixed with a fixing bracket, and the position is adjusted to the other end of the leaf spring. A weight is fixed as possible, and a viscoelastic body or a viscous body damper is coupled between two leaf springs.

JP 59-110938 A (page 2 lower left column to lower right column)

  The dynamic vibration absorber disclosed in Patent Document 1 has a deformed shape represented by a cantilever theoretical formula. For this reason, in order to improve the vibration damping capability, it is necessary to increase the size of the dynamic vibration absorber, and there is room for improvement in order to make the device compact. It is an object of the present invention to ensure a necessary vibration damping capability while making the vibration damping device main body compact.

  In order to solve the above-described problems and achieve the object, a vibration damping device according to the present invention includes a vibration damping body configured by sandwiching a viscoelastic body between a pair of opposing spring members, A first coupling means for coupling the pair of spring members on one end side of the damping body; a second coupling means for coupling the pair of spring members on the other end side of the damping body; And a vibration input member that is attached to the vibration damping body via one coupling means and transmits vibration from a vibration damping object to the vibration damping body.

  A vibration damping device according to the present invention sandwiches a viscoelastic body between a pair of spring members, and configures the vibration damping body by coupling and fixing both end sides of the pair of spring members. Attach one end of the body to the object to be damped. As a result, the vibration damping device according to the present invention generates a greater damping force of vibration even when the device body is the same material and the same size as the dynamic vibration absorber disclosed in Patent Document 1. Can do. Therefore, when using the same material as the dynamic vibration absorber disclosed in Patent Document 1, the vibration damping device according to the present invention can secure the necessary vibration damping capability while making the device main body more compact.

  As a desirable aspect of the present invention, in the vibration damping device, a weight is preferably provided on the other end side of the vibration damping body. Thereby, the vibration damping device can be easily adjusted to the frequency of the vibration to be suppressed.

  As a desirable mode of the present invention, in the vibration damping device, it is preferable that the weight is attached to the vibration damping body by the second coupling means. Thus, by attaching the weight to the damping body using the second coupling means for coupling the pair of spring members, the number of parts of the damping device can be reduced and the cost can be reduced.

  As a desirable aspect of the present invention, it is preferable that the vibration damping device includes a plurality of vibration damping bodies having different distances from the vibration input member to the weight. Thereby, since each vibrating body can be adjusted so as to suppress vibrations having different frequencies, a plurality of vibrations having different frequencies can be simultaneously suppressed.

  As a desirable mode of the present invention, in the vibration damping device, it is preferable that the plurality of vibration damping bodies are attached to the same vibration damping object, and vibration is input from the same position of the vibration damping object. As a result, the degree of freedom for mounting the damping device is improved, so even if the location where the damping device can be installed is limited due to the size and shape of the damping object, the damping device can be used as the damping object. Easy to install.

  As a desirable mode of the present invention, it is preferable that the vibration damping device has a plurality of vibration damping bodies, and the directions in which the vibration damping bodies swing are different. Thereby, vibrations in different directions can be suppressed at the same time.

  As a desirable aspect of the present invention, in the vibration damping device, it is preferable that the vibration suppression target is a rope. The rope is more flexible than the columnar or rod-like structure and is easily bent, and therefore, vibration is likely to occur depending on the surrounding environment, and the amplitude of the generated vibration is likely to increase. The vibration damping device according to the present invention generates a large vibration damping force by sandwiching a viscoelastic body between a pair of spring members and coupling and fixing both ends of the pair of spring members. it can. Thereby, the vibration generated in the rope can be effectively suppressed. Moreover, if the vibration damping device of the present invention has the same vibration suppressing ability, the size of the device main body can be made compact, so that the load applied to the rope that is the object of vibration damping can also be reduced.

  In order to solve the above-described problems and achieve the object, a ferris wheel according to the present invention includes a hub, an outer ring that is connected to the hub via a rope and attaches a gondola to the periphery, and the vibration input member includes It has the damping device of any one of Claim 1 to 6 attached to the said rope. Thereby, the vibration of the rope can be effectively suppressed.

  As a desirable aspect of the present invention, in the ferris wheel, the vibration damping device is preferably attached to the outer ring side. As a result, the vibration control device 1 can be attached to the wire at a position closer to the ground, which facilitates the work.

  As a desirable mode of the present invention, in the ferris wheel, the rope is attached so as to be able to swing in one direction with respect to the outer ring and the hub. It is preferably attached so as to swing in a direction orthogonal to the direction to be performed. As a result, only the vibrations in the direction in which the rope cannot swing can be suppressed, so that the number of damping devices attached to one rope can be reduced and the cost can be reduced.

  The present invention can secure the necessary vibration damping capability while making the vibration damping device body compact.

FIG. 1 is an overall view showing a vibration damping device according to the present embodiment. 2 is a view taken in the direction of arrows YY in FIG. 3 is a view taken in the direction of arrows XX in FIG. FIG. 4A is a schematic diagram illustrating bending of the cantilever beam. FIG. 4B is a schematic diagram illustrating the bending in a case where both ends of the beam are fixed and one fixed fulcrum is sunk. FIG. 5 is a schematic diagram illustrating a vibration mode of a vibration control target. FIG. 6 is an overall view showing a vibration damping device according to a first modification of the present embodiment. 7 is a view taken in the direction of arrows YY in FIG. FIG. 8 is an overall view showing a vibration damping device according to a second modification of the present embodiment. FIG. 9 is an overall view showing a vibration damping device according to a third modification of the present embodiment. FIG. 10 is a view of the vibration damping device according to the third modification of the present embodiment from the direction of the arrow Z in FIG. FIG. 11 is a front view of the ferris wheel. 12-1 is explanatory drawing which shows the state which attached the damping device of this embodiment to the wire which comprises a ferris wheel. 12-2 is explanatory drawing which shows the state which attached the damping device of this embodiment to the wire which comprises a ferris wheel.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range.

  The vibration damping device according to the present embodiment sandwiches a viscoelastic body or a viscous body with a pair of spring members (for example, leaf springs), and combines and fixes both ends of the pair of spring members. It is characterized in that a damping body is constructed and one end side of the damping body is attached to a damping object.

  FIG. 1 is an overall view showing a vibration damping device according to the present embodiment. 2 is a view taken in the direction of arrows YY in FIG. 3 is a view taken in the direction of arrows XX in FIG. The vibration damping device 1 is suitable for suppressing the vibration of the rope (wire, rope, single wire, stranded wire, cable, etc.). In this embodiment, the vibration damping target is the wire 100. Note that the vibration suppression target of the vibration damping device 1 is not limited to the rope, and may be a rod-like or columnar structure.

  As shown in FIG. 1, the vibration damping device 1 is attached to a wire 100 that is a vibration damping target. The wire 100 is a stranded metal wire, and is used, for example, for connecting a hub and an outer ring of a ferris wheel or a hanger rope for connecting a main cable of a suspension bridge and a bridge girder. The vibration damping device 1 is attached to the wire 100 by sandwiching the wire 100 between the vibration input member 11 attached to the vibration damping body 10 and the fixing jig 3. As described above, the damping body 10 and the wire 100 are connected via the vibration input member 11. The vibration of the wire 100 is input to the damping body 10 via the vibration input member 11. The vibration input member 11 and the vibration damping body 10 are connected by the safety cable 4, and the vibration damping body 10 can be prevented from falling off the vibration input member 11.

  As shown in FIG. 1, in the vibration damping device 1, one damping body 10 is provided on each side of the wire 100, and each damping body 10 is arranged symmetrically with respect to the wire 100. Thus, by arranging the pair of damping bodies 10 on both sides of the wire 100, the balance of the damping device 1 is improved. As a result, since the bending force acting on the attachment portion of the vibration damping device 1 for the wire 100 can be suppressed, a decrease in durability of the wire 100 can be effectively suppressed.

  As shown in FIGS. 2 and 3, the vibration damping device 1 includes a vibration damping body 10, bolts 12B and nuts 12N as first coupling means, bolts 16B and nuts 16N as second coupling means, and vibration input. And a member 11. The damping body 10 is configured by sandwiching a viscoelastic body 14 with a pair of spring members 13 arranged to face each other. The pair of spring members 13 includes a first spring member 13A and a second spring member 13B. In the present embodiment, the first spring member 13A and the second spring member 13B are both leaf springs, and are configured with the same dimensional shape and the same material.

  The viscoelastic body 14 sandwiched between the pair of spring members 13, that is, the first spring member 13 </ b> A and the second spring member 13 </ b> B is bonded to the pair of spring members 13. Thereby, the pair of spring members 13 and the viscoelastic body 14 are integrally deformed. The viscoelastic body 14 is deformed when the damping body 10 is swung by the vibration of the damping target. When the viscoelastic body 14 is deformed, the kinetic energy of vibration is converted into thermal energy, and the damping force of vibration generated by the damping body 10 is generated. The viscoelastic body 14 can be made of a polymer material, resin, elastomer, rubber or the like, but rubber is used in this embodiment. A viscous body may be used instead of the viscoelastic body 14.

  The pair of spring members 13 constituting the damping body 10 are coupled by a bolt 12B and a nut 12N on one end portion side of the damping body 10, that is, one end portion T1 side of the pair of spring members 13, and the other end portion T2. On the side, they are joined by bolts 16B and nuts 16N. In the present embodiment, a plurality of bolts 12B and nuts 12N, bolts 16B and nuts 16N are used.

  In coupling the pair of spring members 13 using the bolts 12B and nuts 12N and the bolts 16B and nuts 16N, in this embodiment, the first spacer 17 and the second spacer 18 are disposed between the pair of spring members 13. . More specifically, on the one end portion T1 side of the pair of spring members 13, the first spring member 13A, the first spacer 17, and the second spring member 13B are fastened with bolts 12B and nuts 12N. On the other end T2 side of the pair of spring members 13, the first spring member 13A, the second spacer 18, and the second spring member 13B are fastened with bolts 16B and nuts 16N.

  The first spacer 17 and the second spacer 18 are provided to suppress local deformation of the viscoelastic body 14 held between the pair of spring members 13. The first spacer 17 and the second spacer 18 hold the viscoelastic body 14 at a predetermined position between the pair of spring members 13 and cause the viscoelastic body 14 to appropriately generate a vibration damping force. The dimensions of the first spacer 17 and the second spacer 18 in the direction from the first spring member 13A toward the second spring member 13B, that is, in the direction perpendicular to the surface of the first spring member 13A or the second spring member 13B are the above directions. The size of the viscoelastic body 14 in FIG. Thereby, local deformation of the viscoelastic body 14 can be suppressed and the viscoelastic body 14 can be reliably held by the pair of spring members 13.

  As described above, the damping body 10 is attached to the wire 100 via the vibration input member 11. As shown in FIG. 3, the vibration input member 11 and the fixing jig 3 are fastened by a mounting bolt 4 </ b> B and a mounting nut 4 </ b> N, and the vibration input member 11 and the fixing jig 3 sandwich the wire 100. The vibration input member 11 and the damping body 10 are fastened by a bolt 12B and a nut 12N which are first coupling means. As a result, the damping body 10 is attached to the vibration input member 11 via the bolt 12B and the nut 12N. With such a configuration, the vibration input member 11 transmits the vibration of the wire 100 to the damping body 10. The pair of spring members 13 are connected by a bolt 12B and a nut 12N on the vibration input side, and are connected by a bolt 16B and a nut 16N on the side opposite to the vibration input side.

  In the present embodiment, the plate-like member 5 is provided between the bolt 12B and the first spring member 13A. The plate-like member 5 is not necessarily provided, but by providing the plate-like member 5, the fastening force by the bolts 12 </ b> B and the nuts 12 </ b> N is distributed to the vibration damping body 10. The member 11 can be fastened.

  In the present embodiment, the damping body 10 swings in a direction (in the direction of arrow F in FIGS. 2 and 3) parallel to the plane (vibration plane) perpendicular to the plane of the pair of spring members 13 formed of plate springs. Move. As a result, the vibration damping device 1 suppresses vibration in a direction parallel to the vibration surface. The vibration damping device 1 is attached to the wire 100 so that the vibration direction of the wire 100 to be suppressed is in a direction parallel to the vibration surface.

  A weight 15 is provided on the side opposite to the vibration input side of the damping body 10, that is, on the other end portion T 2 side of the damping body 10. By adjusting the mass of the weight 15, the vibration frequency suppressed by the vibration damping body 10 can be adjusted. In addition, when the frequency which the damping body 10 suppresses can be adjusted without providing the weight 15, it is not necessary to provide the weight 15. The weight 15 is attached to the vibration damping body 10 by a bolt 16B and a nut 16N. As described above, since the means for attaching the weight 15 to the damping body 10 is shared by the bolt 16B and the nut 16N that couple the pair of spring members 13, an increase in the number of parts constituting the damping device 1 can be suppressed. Costs can be reduced and the structure can be simplified.

FIG. 4A is a schematic diagram illustrating bending of the cantilever beam. FIG. 4B is a schematic diagram illustrating the bending when both ends of the beam are fixed and one fixed fulcrum is sunk. As shown in FIG. 4A, when the beam B having a length Lb is supported in a cantilever manner, a load P is applied to the free end of the beam B, and the difference between the fixed end K and the free end (of the beam B It is assumed that the bending at both ends is δ. In this case, the shearing force τ1 of the beam B is as shown in Equation (1). On the other hand, when both ends of the beam B (length Lb) shown in FIG. 4-2 are fixed at fixed fulcrums K1 and K2 and one fixed fulcrum K2 is sunk, the difference between the fixed fulcrum K1 and the fixed fulcrum K2 ( It is assumed that the deflection of both ends of the beam B is δ. In this case, the shearing force τ2 of the beam B is as shown in Expression (2). E in the equations (1) and (2) is the Young's modulus of the beam B, and I is the cross-sectional second moment of the beam B.
τ1 = 3 × E × I × δ / Lb ³ (1)
τ2 = 12 × E × I × δ / Lb ³ (2)

  If the material, dimensions, and shape of the beam B are the same in cantilever and fixed at both ends, if the bending at both ends of the beam B is the same, the case of fixed at both ends is 4 compared to the case of cantilever. Double shear force is generated. In the vibration damping device 1, the viscoelastic body 14 constituting the vibration damping body 10 is deformed in proportion to the shearing force generated in the vibration damping body 10, and kinetic energy is converted into heat energy to generate a damping force. Since the damping body 10 holds the viscoelastic body 14 between the pair of spring members 13 and fixes both ends of the pair of spring members 13 together, the deformation of the damping body 10 is caused by the deformation of the beam B. Same as when both ends are fixed. As a result, the shearing force when the damping body 10 is swung and deformed by vibration is the same as when both ends of the beam B are fixed. As a result, the vibration damping device 1 including the vibration damping body 10 has four times the vibration as long as the device body has the same shape, material, and dimensions as compared with the dynamic vibration absorber disclosed in Patent Document 1 described above. A damping force can be generated. This means that if the vibration damping force is the same as that of the dynamic vibration absorber disclosed in Patent Document 1 described above, the vibration damping device 1 can make the device main body more compact than the dynamic vibration absorber. In this manner, the vibration damping device 1 can ensure the necessary vibration damping capability while making the device main body compact. Further, if the vibration damping device 1 has the same ability to suppress vibration, the size can be made smaller than that of the dynamic vibration absorber, so that the load applied to the vibration damping object can also be reduced.

  The damping device 1 adjusts the mass of the weight 15 provided on the damping body 10, the length L (FIG. 2) of the portion where the damping body 10 swings, and the volume of the viscoelastic body 14. The vibration frequency to be suppressed by the vibration device 1 can be changed, and the additional attenuation can also be changed. The damping device 1 has a simple structure, and the design of the mass of the weight 15 and the length L of the portion where the damping body 10 swings can be easily changed. In particular, since the weight 15 is fixed to the damping body 10 with bolts 16B and nuts 16N, the weight 15 can be easily replaced even after the damping device 1 is attached to the damping target. As a result, even after the vibration damping device 1 is attached to the vibration damping target, the frequency of the vibration to be suppressed by the vibration damping device 1 can be easily changed. As a result, by using the vibration damping device 1, even after a vibration problem occurs, the countermeasure can be easily realized.

  FIG. 5 is a schematic diagram illustrating a vibration mode of a vibration control target. The wire 100 to be controlled is fixed at the fixed ends FA and FB. The length between the fixed ends FA and FB, that is, the length of the vibrating portion of the wire 100 is Lw. In FIG. 5, f <b> 1 is a secondary vibration of the wire 100, f <b> 2 is a tertiary vibration of the wire 100, and f <b> 3 is a fourth-order vibration of the wire 100. The vibration damping device 1 is preferably attached to a portion where the wire 100 vibrates most, that is, a portion of the vibration belly. For example, when it is desired to suppress the third-order vibration of the wire 100, it is preferable to attach the vibration damping device 1 to the position of Lw2, and when to suppress the fourth-order vibration of the wire 100, it is preferable to attach the vibration damping device 1 to the position of Lw1. In this way, the vibration of the wire 100 can be effectively suppressed.

  FIG. 6 is an overall view showing a vibration damping device according to a first modification of the present embodiment. 7 is a view taken in the direction of arrows YY in FIG. The vibration damping device 1a according to the present modification has the same configuration as that of the vibration damping device 1 described above, but a plurality of vibration damping bodies (first vibration damping bodies) having different distances from the vibration input member 11 to the weights 15a1 and 15a2. The vibration damping device 1a is attached to the wire 100 by sandwiching the wire 100 between the vibration input member 11 and the fixing jig 3, as shown in FIG. 6 and 7, a first damping body 10a1 and a second damping body 10a2 are attached to the vibration input member 11 by bolts 12B and nuts 12N as first coupling means.

  The first damping body 10a1 has one end T11 side of the pair of spring members 13a1 (first spring member 13A1 and second spring member 13B1), that is, the vibration input member 11 side (vibration input side), the bolt 12B and the nut. Combined and fixed by 12N. Further, the other end T12 side of the first damping body 10a1 is coupled and fixed by a bolt 16B and a nut 16N which are second fastening means. Further, the first viscoelastic body 14a1 is sandwiched between the pair of spring members 13a1.

  Similarly, the second damping body 10a2 has a pair of spring members 13a2 (first spring member 13A2 and second spring member 13B2) at one end T21 side, that is, the vibration input member 11 side (vibration input side) is a bolt. 12B and nut 12N are connected and fixed. Further, the other end T22 side of the second damping body 10a2 is coupled and fixed by a bolt 16B and a nut 16N which are second fastening means. Further, the second viscoelastic body 14a2 is sandwiched between the pair of spring members 13a2.

  With such a configuration, the weight 15a1 provided on the other end T12 side of the first damping body 10a1 and the weight 15a2 provided on the other end T22 side of the second damping body 10a2 are the vibration input member 11. Are arranged in directions opposite to each other. Similarly to the above-described vibration damping device 1, the vibration damping device 1a includes two first vibration damping bodies 10a1 and two second vibration damping bodies 10a2 arranged on both sides of the wire 100, respectively. Thereby, since the balance of the vibration damping device 1a is improved, the bending force acting on the wire 100 can be suppressed, and the durability of the wire 100 can be effectively suppressed.

  In this modification, the spring member 13A1 constituting the first damping body 10a1 is configured integrally with the spring member 13A2 constituting the second damping body 10a2. Similarly, the spring member 13B1 constituting the first vibration damping body 10a1 is formed integrally with the spring member 13B2 constituting the second vibration damping body 10a2. Thereby, the number of parts constituting the vibration damping device 1a can be reduced. In addition, you may comprise the 1st damping body 10a1 and the 2nd damping body 10a2 separately, respectively. Further, since the spring member 13A1 and the spring member 13A2 are integrally formed and the spring member 13B1 and the spring member 13B2 are integrally formed, one end T11 of the pair of spring members 13a1 and one end T21 of the pair of spring members 13a2 are These are virtual end portions in the case where there is no second damping body 10a2 and no first damping body 10a1, respectively.

  The distance from the vibration input member 11 to the weight 15a1 of the first damping body 10a1, that is, the length L1 of the portion where the first damping body 10a1 swings, and the weight of the second damping body 10a2 from the vibration input member 11 It is different from the distance to 15a2, that is, the length L2 of the portion where the second damping body 10a2 swings. Accordingly, the frequency of vibration suppressed by the first damping body 10a1 is different from the frequency of vibration suppressed by the second damping body 10a2. Thus, vibrations with different frequencies can be suppressed by the single vibration damping device 1a.

  In the damping device 1a, the vibration of the wire 100 is input from the common vibration input member 11 to the first damping body 10a1 and the second damping body 10a2. Therefore, the vibration damping device 1a is attached to one place of the wire 100. That is, the first damping body 10a1 and the second damping body 10a2 are attached to the same damping object, and vibration is input from the same position of the damping object. Thereby, even when the location where the vibration damping device 1a can be attached is restricted due to restrictions on the shape and size of the vibration damping object, the vibration damping device 1a can be attached to the vibration damping object relatively easily.

  For example, let us consider a case in which the third vibration of the wire 100 shown in FIG. 5 is suppressed by the first vibration damper 10a1 of the vibration damping device 1a and the fourth vibration is suppressed by the second vibration damper 10a2. In this case, it is preferable that the vibration damping device 1a is attached to a portion close to the antinodes of both vibrations, that is, between Lw1 and Lw2 in the example shown in FIG. Thereby, the vibration of a different frequency can be effectively suppressed with one damping device 1a.

  FIG. 8 is an overall view showing a vibration damping device according to a second modification of the present embodiment. The vibration damping device 1b is different from the first modification in that it includes a plurality of first vibration damping bodies 10b1 and second vibration damping bodies 10b2 having different distances L1 and L2 from the vibration input members 11b1 and 11b2 to the weights 15b1 and 15b2. It is the same. On the other hand, the present modification is different in that the first damping body 10b1 and the second damping body 10b2 are configured separately. That is, the first vibration damping body 10b1 and the second vibration damping body 10b2 do not share the vibration input members 11b1 and 11b2, respectively.

  For example, consider a case where the first vibration damping body 10b1 of the vibration damping device 1b suppresses the third-order vibration of the wire 100 shown in FIG. 5, and the second vibration damping body 10b2 suppresses the fourth-order vibration. In this case, the first damping body 10b1 is attached to the antinode portion of the tertiary vibration, Lw2 in the example shown in FIG. 5, and the second damping body 10b2 is attached to the antinode portion of the fourth vibration, FIG. In the example shown, it is attached to Lw1. Thereby, the vibration damping ability of the first damping body 10b1 and the vibration damping ability of the second damping body 10b2 set for the respective frequencies can be most effectively exhibited. And the vibration of a different frequency can be suppressed effectively.

  FIG. 9 is an overall view showing a vibration damping device according to a third modification of the present embodiment. FIG. 10 is a view of the vibration damping device according to the third modification of the present embodiment from the direction of the arrow Z in FIG. This damping device 1c is similar to the damping device 1 described above, but has a plurality of damping bodies 10c1, 10c2, and is characterized in that the swinging directions of the damping bodies 10c1, 10c2 are different. is there.

  As shown in FIGS. 9 and 10, the vibration damping device 1 c includes a total of four vibration damping bodies (first vibration damping bodies) 10 c 1 and two vibration damping bodies (second vibration damping bodies) 10 c 2. It has a vibration damping body. The two first damping bodies 10c1 are arranged symmetrically on both sides of the wire 100, respectively. Similarly, the two second damping bodies 10c2 are arranged symmetrically on both sides of the wire 100, respectively. The two first damping bodies 10c1 and the two second damping bodies 10c2 are attached to the vibration input member 11, respectively.

  Two vibration input members 11 are attached to the arcuate attachment jigs 3c1 and 3c2. The attachment jigs 3c1 and 3c2 are coupled by, for example, bolts and nuts that are fastening means. By sandwiching the wire 100 with the two mounting jigs 3c1 and 3c2, the two first damping bodies 10c1 and the two first damping bodies 10c1 are connected via the vibration input member 11 attached to the mounting jigs 3c1 and 3c2. 2 damping body 10c2 is attached to the wire. The vibration of the wire 100 is input to the two first damping bodies 10c1 and the two second damping bodies 10c2 via the attachment jigs 3c1, 3c2 and the vibration input member 11.

  As shown in FIG. 10, the vibration damping device 1c includes a direction in which the first vibration damping body 10c1 swings (direction of arrow F1 in FIG. 10) and a direction in which the second vibration damping body 10c2 swings (arrow in FIG. 10). F2 direction). More specifically, the direction in which the first damping body 10c1 swings is orthogonal to the direction in which the second damping body 10c2 swings. By doing in this way, the damping device 1c can suppress simultaneously the vibration of the wire 100 which is a damping body name in the different direction. The angle formed between the direction in which the first damping body 10c1 swings and the direction in which the second damping body 10c2 swings is not limited to 90 degrees, and is set as appropriate according to the direction of vibration to be suppressed. It is preferable to do.

  As shown in FIG. 9, in the vibration damping device 1c, the weight 15c1 attached to the first vibration damping body 10c1 and the weight 15c2 attached to the second vibration damping body 10c2 are both relative to the vibration input member 11. Arranged in the same direction. However, the arrangement of the first damping body 10c1 and the second damping body 10c2 is not limited to this, and the first damping body 10c1 and the second damping body 10c2 are arranged with respect to the vibration input member 11. The weight 15c1 and the weight 15c2 may be arranged in opposite directions. In this way, since the buffering between the first damping body 10c1 and the second damping body 10c2 can be avoided, the vibration of the wire 100 can be more reliably suppressed even when the amplitude of the wire 100 increases.

(Application example)
FIG. 11 is a front view of the ferris wheel. FIGS. 12A and 12B are explanatory diagrams illustrating a state in which the vibration damping device of the present embodiment is attached to a wire constituting the ferris wheel. 12-2 shows a state where the vibration damping device 1 and the like shown in FIG. 12-1 are viewed from a position rotated 90 degrees around the wire 100 shown in FIG. 12-1. In the following description, an example in which the above-described vibration damping device 1 is applied to the ferris wheel 200 is shown, but other vibration damping devices 1a, 1b, and the like may be applied.

  A ferris wheel 200 shown in FIG. 11 includes a hub 203 that rotates around a rotation axis Zr, and an outer ring 202 that is connected to the hub 203 via a wire (wire) 100 and attaches a gondola 204 to the periphery. The vibration damping device 1 is attached to each wire 100. As shown in FIG. 12A, the vibration damping device 1 is attached to the wire 100 so that the two vibration damping bodies 10 are arranged symmetrically on both sides of the wire 100.

  In the present embodiment, the wire 100 has a first bracket 101 attached to the outer ring 202 side and a second bracket 102 attached to the hub 203 side. The outer ring 202 is provided with an outer ring side wire mounting seat 202B, and the hub 203 is provided with a hub side wire mounting seat 203B. The first bracket 101 is pin-coupled to the outer ring side wire mounting seat 202B and is attached so as to be able to swing around the axis Z1. The second bracket 102 is pin-coupled to the hub-side wire mounting seat 203B and is attached so as to be able to swing around the axis Z2.

  With such a configuration, the wire 100 is configured to be able to swing in a direction parallel to a plane orthogonal to the first axis Z1 and the second axis Z2 (the arrow Fw direction in FIG. 12-1). On the other hand, the wire 100 cannot swing in a direction parallel to the first axis Z1 and the second axis Z2 (the direction of the arrow Fd in FIG. 12-2). That is, the wire 100 is attached to the outer ring 202 and the hub 203 so as to swing in one direction.

  With such a configuration, when the wire 100 vibrates in a direction in which the wire 100 can swing, the first bracket 101 swings around the first axis Z1 at the attachment portion between the wire 100, the outer ring 202, and the hub 203. Then, the second bracket 102 swings around the second axis Z2. As a result, even when the wire 100 itself vibrates in the direction in which the wire 100 can swing, the movement is allowed at the attachment portion of the wire 100, the outer ring 202, and the hub 203, so that an excessive force is applied to the attachment portion. Is not input, and a decrease in durability of the mounting portion is suppressed.

  However, when the wire 100 itself vibrates in a direction in which the wire 100 cannot swing, between the first bracket 101 and the outer ring side wire mounting seat 202B and between the second bracket 102 and the hub side wire mounting seat 203B, Swing is not allowed. For this reason, if the wire 100 vibrates in a direction in which the wire 100 cannot swing, an excessive force may be input to the attachment portion between the wire 100 and the outer ring 202 and the hub 203.

  Therefore, in the present embodiment, the vibration control device 1 suppresses vibration in a direction in which the wire 100 cannot swing. Specifically, the damping device 1 is adjusted so that the damping body 10 included in the damping device 1 swings in a direction in which the wire 100 cannot swing, that is, in a direction orthogonal to the direction in which the wire 100 swings. Attach to wire 100. As a result, the vibration control device 1 suppresses vibration in a direction in which the wire 100 cannot swing, so that the force input to the attachment portion between the wire 100, the outer ring 202, and the hub 203 is suppressed, and the durability of the attachment portion is reduced. Reduction can be suppressed. Further, since only the vibration in the direction in which the wire 100 cannot swing is suppressed, the number of damping devices 1 attached to one wire 100 can be reduced, and the cost can be reduced. Here, the vibration damping device 1 is preferably attached to the outer ring 202 side of the wire 100. As a result, the vibration control device 1 can be attached to the wire at a position closer to the ground, which facilitates the work.

  The ferris wheel 200 to which the vibration damping device 1 is applied is a system in which the hub 203 and the outer ring 202 are connected by the wire 100, but the inner ring and the outer ring are connected by using the spokes for compression and tension and the wires for tension. The vibration damping device 1 can be applied even to a ferris wheel of the type. Further, the vibration control device 1 and the like can be applied not only to a ferris wheel but also to an illumination column, a traffic sign post, an electric wire, and the like.

  In particular, since the vibration damping device 1 and the like have a simple structure, it is easy to design in accordance with the frequency and direction of vibration to be suppressed. For this reason, even if a vibration problem occurs after constructing a structure such as a ferris wheel, a bridge, or a traffic sign, the individual measures can be easily and quickly realized by using the vibration control device 1 or the like. There are advantages. Further, since the vibration damping device 1 or the like uses the vibration damping body 10 or the like having a structure in which a viscoelastic body is sandwiched between a pair of spring members and both ends are fixed, the vibration damping device 1 or the like has a large vibration damping capability. Large deformation is unlikely to occur in the body 10 or the like. For this reason, it is possible to reduce the risk of fatigue of the steel stranded wire without being able to follow the large deformation found in the stock bridge damper.

  As described above, the vibration damping device and the ferris wheel according to the present invention are useful for securing the necessary vibration damping capability while making the device main body compact.

1, 1a, 1b, 1c Damping device 3 Fixing jig 3c1, 3c2 Mounting jig 4 Safety cable 4B, 12B, 16B Mounting bolt 4N, 12N, 16N Mounting nut 5 Plate member 10 Damping body 10a1, 10b1 First Damping body 10a2, 10b2 Second damping body 10c1 First damping body (damping body)
10c2 Second damping body (damping body)
11, 11b1 Vibration input member 13, 13a1, 13a2 A pair of spring members 13A, 13A1, 13A2 First spring member 13B, 13B1, 13B2 Second spring member 14, 14a1, 14a2 Viscoelastic body 15, 13a1, 15a1, 15a2, 15b1 , 15b2, 15c1, 15c2 Weight 17 First spacer 18 Second spacer 100 Wire 101 First bracket 102 Second bracket 200 Ferris wheel 201 Rotating wheel 202 Outer ring 202B Outer ring side wire mounting seat 203 Hub 203B Hub side wire mounting seat 204 gondola

Claims (10)

A damping body configured by sandwiching a viscoelastic body with a pair of spring members disposed opposite to each other;
First coupling means for coupling the pair of spring members on one end side of the vibration damping body;
Second coupling means for coupling the pair of spring members to each other on the other end side of the damping body;
A vibration input member that is attached to the vibration damping body via the first coupling means and transmits vibration from a vibration damping target to the vibration damping body;
A vibration damping device comprising:   The damping device according to claim 1, wherein a weight is provided on the other end portion side of the damping body.   The damping device according to claim 2, wherein the weight is attached to the damping body by the second coupling means.   The damping device according to claim 2 or 3, comprising a plurality of damping bodies having different distances from a vibration input member to the weight.   The vibration control device according to claim 4, wherein the plurality of vibration control bodies are attached to the same vibration control object, and vibration is input from the same position of the vibration control object.   6. The vibration damping device according to claim 1, wherein the vibration damping device includes a plurality of the vibration damping bodies, and each of the vibration damping bodies has a different swinging direction.   The damping device according to any one of claims 1 to 6, wherein the damping target is a cable. A hub,
An outer ring connected to the hub via a rope and attaching a gondola around,
The vibration damping device according to any one of claims 1 to 6, wherein the vibration input member is attached to the rope.
Ferris wheel characterized by having.   The ferris wheel according to claim 8, wherein the vibration damping device is attached to the outer ring side. The rope is attached so that it can swing in one direction with respect to the outer ring and the hub,
The ferris wheel according to claim 8 or 9, wherein the vibration control device is attached so as to swing in a direction orthogonal to a direction in which the rope swings.

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