JP2023084596A - Vibration control structure - Google Patents

Abstract

To provide a vibration control structure having small bending deformation and shear deformation with respect to an axial direction while exhibiting a vibration control effect with respect to the axial direction.SOLUTION: A suspending member 50 is composed of a vibration control member 100, and an upper suspension member 52 and a lower suspension member 53 which are joined to both sides of the vibration control member 100 in an axial direction and coaxially arranged. The axial rigidity of the vibration control member 100 is smaller than the axial rigidity of the upper suspension member 52 and the lower suspension member 53, and the bending rigidity and shear rigidity of the vibration control member 100 are equal to or larger than those of the upper suspension member 52 and the lower suspension member 53.SELECTED DRAWING: Figure 2

Description

The present invention relates to an anti-vibration structure.

Japanese Patent Laid-Open No. 2002-200001 discloses a technique relating to a method of damping and filtering vibration amplitude due to mechanical causes of a structure to be separated. In this prior art, incident vibration coupled with damping is applied to mechanical stresses in a very broad frequency band and amplitude range imparted to the structure by providing damping of the filtered vibratory wave transmitted to the structure. It is characterized by performing wave filtering.

Patent Literature 2 discloses a technique related to a vibration isolating member on which a vibration-generating device such as a press device is placed and capable of reducing the vibration of the device. In this prior art, a device mounting portion on which a device is mounted, a plurality of disc springs interposed between the supporting portion and the device mounting portion and superimposed in the vertical direction, and the plurality of disc springs and a disk spring supporting portion that restrains and supports displacement and deformation in directions other than the vertical direction.

Patent Literature 3 discloses a technique related to a unit cell of an artificial phononic crystal for constructing an artificial phononic metamaterial.

Patent No. 5105875 JP 2013-53720 A JP 2019-522151 A

Vibration-isolating members often exhibit vibration-isolating performance by reducing rigidity in the axial direction using springs or rubber. However, springs and rubber also have low shear stiffness and bending stiffness in the axial direction. Therefore, for example, the horizontal displacement of the ceiling suspended by the anti-vibration member increases during an earthquake.

SUMMARY OF THE INVENTION In view of the above facts, it is an object of the present invention to provide an anti-vibration structure that exerts anti-vibration effects in the axial direction while reducing bending deformation and shear deformation when forces act in bending and shear directions. .

A first aspect is a vibration-isolating structure composed of a vibration-isolating member and support members joined to both sides of the vibration-isolating member in the axial direction and arranged coaxially, wherein is smaller than the axial rigidity of the support member, and the flexural rigidity and shear rigidity of the vibration damper are equal to or greater than the flexural rigidity and shear rigidity of the support member.

In the anti-vibration structure according to the first aspect, with respect to axial vibration between one support member and the other support member, the axial rigidity of the anti-vibration member is greater than the axial rigidity of the support member. Vibration-proof performance can be demonstrated by reducing . In addition, when a force in the bending direction and the shearing direction acts between one supporting member and the other supporting member, the bending rigidity and shearing rigidity of the vibration isolating member differ from the bending rigidity and shearing rigidity of the supporting member. When the stiffness is the same or higher, the bending deformation and the shear deformation are smaller than when the stiffness is less than the same.

Here, "the axial rigidity of the vibration-isolating member is smaller than the axial rigidity of the supporting member" means that the axial rigidity of the vibration-isolating structure composed of the vibration-isolating member and the supporting member It means that the stiffness in the axial direction is less than if the structure were assumed to consist only of supporting members.

Further, "the flexural rigidity and shear rigidity of the vibration-isolating member are equal to or greater than those of the supporting member" means that the flexural rigidity and shear rigidity of the vibration-isolating structure composed of the vibration-isolating member and the supporting member are It means that the bending stiffness and shear stiffness are equal to or higher than those in the case where the vibration isolation structure is assumed to be composed only of supporting members.

When the vibration-isolating structure includes a plurality of vibration-isolating members, the vertical axis of the vibration-isolating members is defined as the axis of the vibration-isolating members when the entirety of the plurality of vibration-isolating members are regarded as one vibration-isolating member.

In a second aspect, the vibration-isolating member includes a cylindrical body having a shaft part inside which is joined to one of the supporting members and connected to the other supporting member, and is spaced apart in the cylindrical body in the axial direction. A vibration-damping structure according to the first aspect, comprising: a plurality of face materials provided with a gap between them, the central portion of which is joined to the shaft portion, and the outer edge portion of which is joined to the inner peripheral surface of the cylindrical body; is.

In the anti-vibration structure according to the second aspect, against axial vibration between one support member and the other support member, the A plurality of face materials provided at intervals in the axial direction deform out-of-plane in the axial direction, thereby exhibiting anti-vibration performance. In addition, when a force in a bending direction and a shearing direction acts between one support member and the other support member, the outer edge portion becomes a cylindrical body through the shaft portion joined to the other support member. Bending deformation and shear deformation are reduced by the resistance of the face material joined to the .

In a third aspect, the vibration-isolating member is hollowed out so that the rigidity in the axial direction is smaller than that of the supporting member, and the bending rigidity and the shearing rigidity are equal to or higher than those of the supporting member, and have anisotropy in rigidity. The vibration-damping structure according to the first aspect, which is a lightening structure.

In the vibration isolating structure according to the third aspect, with respect to vibration in the axial direction between one supporting member and the other supporting member, the rigidity in the axial direction is hollowed out so as to be smaller than that of the supporting member. The anti-vibration performance is exhibited by the anti-vibration member. In addition, when a force in the bending direction and the shearing direction acts between one supporting member and the other supporting member, the bending rigidity and the shearing rigidity are reduced to be equal to or higher than that of the supporting member. The damping member results in less bending and shear deformation than would be the case with less than equivalent stiffness.

According to the present invention, the vibration isolation structure can reduce bending deformation and shear deformation in the axial direction while exhibiting a vibration isolation effect in the axial direction.

1 is a front view of a suspended ceiling using suspension members according to a first embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view along the axial direction of the vibration isolating member of the hanging member according to the first embodiment of the present invention; It is a perspective view of the vibration-proof member of the suspension member of 1st embodiment of this invention. (A) is a stress distribution diagram of a suspension member of a comparative example, and (B) is a stress distribution diagram of a suspension member of the first embodiment. It is a graph which shows the anti-vibration characteristic of the suspension member of 1st embodiment of this invention. FIG. 5 is a perspective view of a unit that constitutes a vibration isolating member of the suspension member according to the second embodiment of the present invention; FIG. 5 is a perspective view of a structure that constitutes a vibration isolating member of the suspending member according to the second embodiment of the present invention; It is a perspective view of the vibration-proof member of the suspension member of 2nd embodiment of this invention. FIG. 11 is a perspective view of a structure of a first modified example of the second embodiment of the present invention; FIG. 11 is a perspective view of a structure of a second modified example of the second embodiment of the present invention; It is the front view which fixed equipment on the vibration isolator of 3rd embodiment of this invention. FIG. 3 is a plan view schematically showing a vibration isolator according to a third embodiment of the invention; It is a front view of the suspension member using the existing vibration-proof member.

<First embodiment>
A suspending member as an example of the anti-vibration structure of the first embodiment of the present invention will be described. Note that the two orthogonal horizontal directions are the X direction and the Y direction, which are indicated by arrows X and Y, respectively. An arrow Z indicates a vertical direction orthogonal to the X direction and the Y direction as the Z direction. Also, the direction of the vibration isolating member is in a state in which it is used as a hanging member, which will be described later.

[structure]
The structure of the suspension member of this embodiment will be described.

The suspended ceiling 10 shown in FIG. 1 includes suspension members 50 , a T-bar 30 suspended from the slab 20 by the suspension members 50 , and a ceiling material 32 joined to the T-bar 30 . The T-bars 30 are arranged in a grid pattern in plan view. In addition, the structure of the suspended ceiling 10 is an example and is not limited to this.

A suspension member 50 as an example of a vibration isolation structure includes an upper suspension member 52 and a lower suspension member 53 as an example of a support member, and a vibration isolation member 100 . The upper suspending member 52, the lower suspending member 53, and the vibration isolating member 100 have the same vertical axis, that is, are provided coaxially. The axial direction in this embodiment is the vertical direction.

The upper suspending member 52 and the lower suspending member 53 in this embodiment are steel bars having the same thickness. The upper hanging member 52 has its upper end fixed to the slab 20 and its lower end 54 (see FIG. 2) joined to the vibration isolating member 100 . The lower suspension member 53 has an upper end 55 (see FIG. 2) joined to the vibration isolating member 100 and a lower end connected to the T-bar 30 .

1 and 2, the rigidity in the axial direction is smaller than the rigidity in the axial direction of the upper suspension member 52 and the lower suspension member 53, and the bending rigidity and shear rigidity are lower than those of the upper suspension member 52 and the lower suspension member 53. It is a member made of synthetic resin that is set to be equal to or greater than the flexural rigidity and shear rigidity of the hanging member 53 .

Here, "the axial rigidity of the vibration isolating member 100 is smaller than the axial rigidity of the upper suspension member 52 and the lower suspension member 53" means that The rigidity in the axial direction of the suspension member 50 to which the vibration isolating member 100 is joined is the same as that of the suspension member 800 (Fig. 4 (A ) is less than the axial stiffness of ).

Further, "the flexural rigidity and shear rigidity of the vibration-isolating member 100 are equal to or higher than those of the upper suspension member 52 and the lower suspension member 53" means that The flexural rigidity and shear rigidity of the entire suspension member 50 to which the vibration-isolating member 100 is joined are lower than that of the suspension member 800 (Fig. 4 ( A) It means that the bending stiffness and shear stiffness are equal to or higher than the stiffness in the axial direction of (see A)).

As shown in FIG. 2, the vibration isolating member 100 of this embodiment includes a tubular body 110, a shaft portion 120, and a face member 130. As shown in FIG. In this embodiment, the cylinder 110 has a cylindrical shape (see FIG. 3) and the shaft portion 120 has a columnar shape, but they are not limited to this. For example, the cylindrical body may be rectangular and the shaft may be prismatic.

The cylindrical body 110 has a cylindrical side wall portion 112 and a ceiling portion 114 . The ceiling portion 114 is formed with a joint portion 140 having a screw hole 142 along the axial direction.

A face member 130 and a shaft portion 120 are provided inside the cylindrical body 110 . The shaft portion 120 is provided axially within the cylindrical body 110, and a screw hole 143 is formed therein along the axial direction.

A plurality of disk-shaped face members 130 are provided inside the cylindrical body 110 at intervals in the axial direction. Further, the shaft portion 120 is joined to the axial center portion of the face member 130 so as to pass therethrough, and the outer edge portion 132 is joined to the inner peripheral surface 112A of the tubular body 110 .

In addition, in FIG. 2, the side wall portion 112, the ceiling portion 114, and the face member 130 of the cylindrical body 110 are illustrated with the same plate thickness, but the thickness is not limited to this. For example, as will be described later, the face member 130 functions as a leaf spring that elastically deforms in the out-of-plane direction (axial direction). may be smaller than

The lower end portion 54 of the upper hanging member 52 is threaded, and is joined to the tubular body 110 of the vibration isolating member 100 by screwing it into the screw hole 142 of the joining portion 140 of the vibration isolating member 100 . Similarly, the upper end portion 55 of the lower hanging member 53 is threaded and is joined to the shaft portion 120 of the vibration isolating member 100 by screwing it into the screw hole 143 of the shaft portion 120 of the vibration isolating member 100 . ing.

Note that the joint structure between the upper suspension member 52 and the lower suspension member 53 and the vibration isolating member 100 is an example and is not limited to this.

The vibration isolating member 100 of this embodiment is made of synthetic resin, and is constructed by integrating a cylinder 110, a shaft portion 120, and a face member 130. As shown in FIG. In addition, although the anti-vibration member 100 of the present embodiment is manufactured by a 3D printer, it is not limited to this. For example, parts having a semicircular shape when viewed in the axial direction may be manufactured and then joined together to integrate.

As described above, the vibration isolating member 100 has an axial rigidity smaller than that of the upper suspension member 52 and the lower suspension member 53, and a bending rigidity and a shear rigidity of the upper suspension member 52 and the lower suspension member 53. For example, the diameter and plate thickness of the cylinder 110, the plate thickness, number of sheets and spacing of the face members 130 are set so as to be equal to or greater than the bending rigidity and shear rigidity of 53.

From another point of view, the vibration isolating member 100 of the present embodiment has axial rigidity smaller than that of the upper suspension member 52 and the lower suspension member 53, and bending rigidity and shear rigidity of the upper suspension member 52 and the lower suspension member 53. It can be said that it is a mechanical metamaterial having an anisotropic stiffness equal to or greater than the bending stiffness and shear stiffness of the suspension member 52 and the lower suspension member 53 .

[Action]
Next, the operation of this embodiment will be described.

First, a suspending member 500 having a vibration isolating member 600, which is an example of a conventional vibration isolating member shown in FIG. 13, will be described.

A conventional vibration isolating member 600 in this example includes a steel frame portion 610 and a rubber portion 620 . The frame portion 610 has a structure in which a plate material is molded into a rectangular frame shape, and through holes 614 and 615 are formed in a ceiling portion 612 and a bottom portion 613, respectively. A rubber portion 620 is provided on the bottom portion 613 of the frame portion 610 . A through hole 622 is also formed in the rubber portion 620 .

The lower end portion 54 of the upper hanging member 52 is inserted through the through hole 614 of the ceiling portion 612 of the frame portion 610 and fastened with a nut 700 . The upper end portion 55 of the lower hanging member 53 is inserted through the through holes 615 and 622 of the bottom surface portion 613 of the frame portion 610 and the rubber portion 620 and fixed by the nut 700 .

The rubber portion 620 of the anti-vibration member 600 of the suspension member 500 configured as described above has less rigidity in the axial direction than the upper suspension member 52 and the lower suspension member 53 and is elastically deformed in the axial direction. Therefore, the axial vibration transmitted between the slab 20 (see FIG. 1) and the ceiling material 32 (see FIG. 1) through the hanging member 500 is reduced by elastic deformation of the rubber portion 620 in the axial direction. do.

On the other hand, the rubber portion 620 has smaller shear rigidity and bending rigidity in the axial direction than the upper suspension member 52 and the lower suspension member 53, and is elastically deformed in the shear direction (horizontal direction) and bending direction. Therefore, as shown in FIG. 13B, during an earthquake, the displacement of the lower suspension member 53 in the horizontal direction and the bending direction with respect to the axial direction is large, and the lateral shaking of the ceiling member 32 (see FIG. 1) is large. It should be noted that FIG. 13B shows the displacement larger than the actual one for easy understanding.

On the other hand, the vibration isolating member 100 of the suspension member 50 of the present embodiment shown in FIGS. The flexural rigidity and shear rigidity are set to be equal to or greater than those of the upper suspension member 52 and the lower suspension member 53 .

Therefore, vibration in the axial direction transmitted between the slab 20 (see FIG. 1) and the ceiling material 32 (see FIG. 1) through the suspending member 50 is reduced by the anti-vibration member 100. FIG. Specifically, a plurality of face members 130 provided at intervals in the axial direction of the vibration isolating member 100 are elastically deformed in the axial direction (out-of-plane direction), thereby reducing vibration in the axial direction.

On the other hand, the bending rigidity and shear rigidity of the vibration isolating member 100 are set to be equal to or greater than those of the upper suspension members 52 and the lower suspension members 53 . Therefore, in the event of an earthquake, the displacement of the lower suspension member 53 in the horizontal direction and the bending direction with respect to the axial direction is small, so that the lateral vibration of the ceiling member 32 (see FIG. 1) is reduced. Specifically, the face member 130, to which the shaft portion 120 joined to the lower hanging member 53 is joined to the central portion, serves as a horizontal resistance element, thereby reducing the horizontal displacement of the shaft portion 120. . Further, since the upper end portion and the lower end portion of the shaft portion 120 of the vibration isolating member 100 are fixed by the face member 130, displacement of the shaft portion 120 in the bending direction is reduced.

[experiment]
Next, experiments on the bending rigidity of the hanging member 50 of the present embodiment and the anti-vibration effect against vibration in the axial direction will be described.

FIG. 4A shows a suspension member 800 of a comparative example, and FIG. 4B shows a suspension member 50 using the vibration isolating member 100 of this embodiment manufactured by a 3D printer.

A suspension member 800 of a comparative example shown in FIG. 4A is composed only of the same steel bar material as the upper suspension member 52 and the lower suspension member 53 . The overall axial length of the suspension member 800 of the comparative example is the same as the overall length of the axial direction of the suspension member 50 of the present embodiment.

FIG. 4A shows the stress distribution and the amount of deformation L1 when the upper end portion of the suspension member (bar member) 800 of the comparative example is fixed and the lower end portion is horizontally loaded. FIG. 4B shows the stress distribution and the amount of deformation L2 when the upper end of the suspension member 50 of this embodiment is fixed and the lower end is horizontally loaded. Note that the denser the dots, the greater the stress. As can be seen from this figure, the stress distribution and deformation amount L1 of the suspension member 800 of the comparative example and the stress distribution and deformation amount L2 of the suspension member 50 of this embodiment are the same.

It should be noted that experiments were conducted with horizontal loads ranging from 0 to 10 N. In all cases, the stress distribution and deformation amount of the suspension member 50 of the present embodiment were equal to or greater than those of the suspension member 800 of the comparative example. .

From this, it can be seen that the vibration isolating member 100 has bending rigidity and shear rigidity equal to or greater than those of the upper suspension member 52 and the lower suspension member 53 .

FIG. 5 is a graph showing the results of a vibration test performed by fixing the upper end of the hanging member 50 using the anti-vibration member 100 manufactured by a 3D printer and hanging a weight of 10 kg from the lower end. Specifically, a graph of the result of measuring the ratio of the magnitude of vibration input from the upper suspension member 52 to the vibration isolation member 100 and the magnitude of vibration transmitted from the vibration isolation member 100 to the lower suspension member 53. is.

From this graph, it can be read that there is one clear peak and that the magnitude of vibration is reduced in a frequency band higher than the frequency at which the peak occurs. , it can be seen that the ideal anti-vibration characteristics of a single-mass point system are exhibited.

From this, it can be seen that the anti-vibration member 100 has a high anti-vibration effect against vibration in the axial direction.

<Second embodiment>
A suspending member as an example of the anti-vibration structure of the second embodiment of the present invention will be described. The same reference numerals are given to the same members as in the first embodiment, and overlapping explanations are omitted or simplified.

[structure]
The structure of the suspension member of this embodiment will be described. Note that the components other than the vibration-isolating member are the same as those of the first embodiment, so the vibration-isolating member will be mainly described.

The vibration isolating member 200 that constitutes the suspension member 60 of this embodiment shown in FIG. It is a member made of resin that is set to have bending rigidity and shear rigidity equal to or higher than those of the upper suspension member 52 and the lower suspension member 53 .

The vibration isolating member 200 of this embodiment is composed of a plurality of units 210 (see FIG. 6). A unit 210 shown in FIG. 6 includes a pair of substantially rectangular first plates 212 arranged to face each other in the axial direction, and side portions 214A, 214B, 214C, and 214D of the pair of first plates 212. and a second plate 220 curved in the outboard direction of the joint surface. Note that the side portions 214A, 214B, 214C, and 214D are simply referred to as the side portion 214 when the description is made without distinguishing them.

The first plate 212 has a plate-like shape in which the corners of a square in plan view are cut into arcs, and the plate thickness direction is the axial direction. The thickness direction of the second plate 220 is the X direction or the Y direction, and is curved in the out-of-plane direction toward the central portion of the first plate 212 in plan view. Note that the corners of the first plate 212 may not be cut in an arc shape. For example, the corners of the first plate 212 may be straight cut, or may be truly rectangular with no cut. Also, the first plate 212 does not have to be square in plan view, and may have a rectangular shape.

As shown in FIG. 7, the units 210 are arranged in the X direction and the Y direction perpendicular to the axial direction, and the side portions 214 (see FIG. 6) of adjacent first plates 212 are joined to each other. Specifically, the side portion 214A and the side portion 214C shown in FIG. 6 are joined, and the side portion 214C and the side portion 214D are joined. A structure 250 in which the units 210 shown in FIG. 7 are arranged in the X direction and the Y direction.

The first plate 212 (see FIG. 6) forming the upper surface 252 and the first plate 212 (see FIG. 6) forming the lower surface 254 of the structure 250 in which the plurality of units 210 of FIG. , the upper fixing portion 260 and the lower fixing portion 270 are joined together.

As shown in FIG. 8, the upper fixing portion 260 has a rectangular plate shape in plan view, and is provided with an upper joining portion 262 having a screw hole (not shown) formed on the axis. Similarly, the lower fixing portion 270 has a rectangular plate shape in plan view, and is provided with a lower joint portion 272 having a screw hole (not shown) formed on the axis.

The vibration isolating member 200 of the present embodiment is integrated with a structure 250 composed of a plurality of units 210, an upper fixing portion 260 and a lower fixing portion 270, and is manufactured entirely by a 3D printer. It is not limited to this. For example, the structure 250 composed of the units 210 may be manufactured by a 3D printer, and the upper fixing part 260 and the lower fixing part 270 may be manufactured by molding and joined. Alternatively, only the unit 210 may be manufactured by a 3D printer, and these may be arranged and joined to form the structure 250 . Moreover, the unit 210 may also be manufactured by a method other than a 3D printer.

As shown in FIG. 8, the upper hanging member 52 is prevented by screwing the threaded lower end portion 54 into a screw hole (not shown) of the upper joint portion 262 of the upper fixing portion 260 of the anti-vibration member 200 . It is joined with the vibration member 200 . Similarly, the threaded upper end 55 of the lower hanging member 53 is screwed into a screw hole (not shown) of the lower joint portion 272 of the lower fixing portion 270 of the vibration isolating member 200, thereby providing vibration isolation. It is joined with member 200 .

Here, in the single unit 210 shown in FIG. 6, the rigidity is low with respect to deformation in the axial direction (vertical direction) because the curved second plate 220 is elastically deformed in the out-of-plane direction. In addition, the unit 210 has high rigidity because the second plate 220 having a plate thickness direction that is perpendicular to the shear direction resists deformation in the shear direction. For example, the second plate 220 that connects the upper and lower side portions 214C and the upper and lower side portions 214A resists shear deformation in the X direction.

Since the second plate 220 is elastically deformed with respect to the deformation of the unit 210 in the bending direction, the rigidity is small. For example, in the case of rotation around the Y-axis in FIG. 6, the second plate 220 that connects the upper and lower sides 214B and the second plate 220 that connects the upper and lower sides 214D are elastically deformed, so the bending rigidity is not large.

In the structure 250 in which a plurality of units 210 are arranged, the axial stiffness and shear stiffness are equal to the number of the arranged units 210 . On the other hand, with respect to bending rigidity, since resistance in the bending direction increases as the distance from the bending moment axis increases, the bending rigidity has a rigidity equal to or greater than the number of units. Therefore, the more units 210 are arranged, the greater the difference between the rigidity in the axial direction and the rigidity in the bending direction of the structural body 250 . That is, the structure 250 has low rigidity only in the axial direction.

Therefore, by adjusting the size and thickness of the first plate 212 and the second plate 220 of the unit 210 and the number of the units 210 arranged, the rigidity in the axial direction can be adjusted to the axis of the upper suspension member 52 and the lower suspension member 53. It is smaller than the directional rigidity, and can be set so that the bending rigidity and shear rigidity are equal to or greater than the bending rigidity and shear rigidity of the upper suspension member 52 and the lower suspension member 53 .

From another point of view, the vibration isolating member 200, the structural body 250, and the unit 210 are hollow structures in which the upper and lower first plates 212 and the four curved second plates 220 are hollow. Therefore, the vibration isolating member 200 has an axial rigidity smaller than that of the upper suspension member 52 and the lower suspension member 53, and a bending rigidity and a shear rigidity equal to or higher than those of the upper suspension member 52 and the lower suspension member 53. It can be said that it is a lightening structure having anisotropy in rigidity.

Alternatively, the vibration isolating member 200 has an axial rigidity smaller than that of the upper suspension member 52 and the lower suspension member 53, and a bending rigidity and a shear rigidity that are greater than the bending rigidity of the upper suspension member 52 and the lower suspension member 53. It can be said that it is a mechanical metamaterial with anisotropy in stiffness that is equal to or greater than the stiffness and shear stiffness.

[Action]
Next, the operation of this embodiment will be described.

As in the first embodiment, the vibration isolation member 200 of the suspension member 60 of this embodiment shown in FIG. 8 has axial rigidity smaller than that of the upper suspension member 52 and the lower suspension member 53. The flexural rigidity and shear rigidity are set to be equal to or greater than those of the upper suspension member 52 and the lower suspension member 53 .

Therefore, vibration in the axial direction transmitted between the slab 20 (see FIG. 1) and the ceiling material 32 (see FIG. 1) through the suspending member 60 is reduced by the anti-vibration member 200. FIG. Specifically, the elastic deformation of the curved second plate 220 of the unit 210 of the anti-vibration member 200 reduces vibration in the axial direction.

On the other hand, the bending rigidity and shear rigidity of the vibration isolating member 200 are set to be equal to or greater than those of the upper suspension member 52 and the lower suspension member 53 . Therefore, in the event of an earthquake, the displacement of the lower suspension member 53 in the horizontal direction and the bending direction with respect to the axial direction is small, so that the lateral vibration of the ceiling member 32 (see FIG. 1) is reduced.

[Modification]
A modification of the structure of the second embodiment will be described.

In the above embodiment, the plurality of units 210 are arranged side by side in the X direction and the Y direction, but are not limited to this. Two or more units 210 may be joined to provide the required axial stiffness, bending stiffness and shear stiffness. Therefore, next, another example will be described as a modified example.

(first modification)
As shown in FIG. 9, in the structure 255 of the first modified example, the units 210 are arranged in a lattice along the X direction and the Y direction and joined together. Furthermore, the units 210 are stacked only in rows along the X direction.

(Second modification)
As shown in FIG. 10, in the structure 257 of the second modified example, the units 210 are arranged in the X direction and the Y direction and laminated in the Z direction and joined. From another point of view, the structure 250 is stacked in the Z direction.

<Third embodiment>
A vibration isolation device 70 as an example of a vibration isolation structure according to a third embodiment of the present invention will be described.

[structure]
As shown in FIG. 11 , equipment 82 such as a motor, which is a source of vibration, is fixed on a vibration isolator 70 installed on the slab 80 .

The vibration isolation device 70 is composed of a plurality of vibration isolation members 300 , bolts 74 , an upper mount 72 and a lower mount 73 . The plurality of vibration isolating members 300 are provided so that their vertical axes coincide with the vertical axes G (see FIG. 12) of the upper mount 72 and the lower mount 73, that is, coaxially.

As will be described later, the anti-vibration members 300 are arranged at the corners of the rectangle in plan view. The “vertical axis of the plurality of vibration isolating members 300” is the center position of the rectangle. From another point of view, the axis G of the plurality of vibration-isolating members 300 is the axis in the vertical direction when the plurality of vibration-isolating members 300 are regarded as one vibration-isolating member.

The upper mount frame 72 and the lower mount frame 73 are each constructed by assembling steel frames in a rectangular frame shape in a plan view (see also FIG. 12). A vibration isolating member 300 is provided between corners of the rectangular frame-shaped upper frame 72 and lower frame 73 .

The vibration isolating member 300 of the present embodiment has a configuration in which an upper fixing portion 360 and a lower fixing portion 370 are provided above and below the structure 257 (see FIG. 10) of the second modified example of the second embodiment. . The upper fixing portion 360 is a plate-like member that is rectangular in plan view, and screw holes (not shown) are formed at each corner. Similarly, the lower fixing portion 370 is a plate-like member that is rectangular in plan view, and screw holes (not shown) are formed at each corner.

The upper frame 72 is joined to the vibration isolating member 300 by screwing bolts 74 into screw holes (not shown) at the corners of the upper fixing portion 360 of the vibration isolating member 300 . Similarly, the lower frame 73 is joined to the vibration isolating member 300 by screwing bolts 74 into screw holes (not shown) at the corners of the lower fixing portion 370 of the vibration isolating member 300 .

In addition, the rigidity in the axial direction of the plurality of vibration-isolating members 300 as a whole is smaller than the rigidity in the axial direction of the upper frame 72 and the lower frame 73 including the bolts 74, and the bending rigidity and the shear rigidity are lower than the rigidity in the axial direction of the upper frame including the bolts 74. It can be set to be equal to or greater than the bending stiffness and shear stiffness of 72 and lower frame 73 .

Here, "the axial rigidity of the entire plurality of vibration-isolating members 300 is smaller than the axial rigidity of the upper mount 72 and the lower mount 73 including the bolts 74" means that the upper mount 72 and the lower mount 73 The axial rigidity of the vibration isolator 70 as a whole, in which a plurality of vibration isolating members 300 are joined with bolts 74, is the same as that of the upper pedestal 72 and the lower pedestal 73. It means that the stiffness in the axial direction is less than when it is bonded.

Further, "the flexural rigidity and the shear rigidity of the entire plurality of vibration-isolating members 300 are equal to or greater than the flexural rigidity and the shear rigidity of the upper mount 72 and the lower mount 73 including the bolts 74" means that the upper mount 72 and the lower mount 73 The flexural rigidity and shear rigidity of the entire vibration isolator 70 in which a plurality of vibration isolating members 300 are joined with bolts 74 between and the same mount as the upper mount 72 and the lower mount 73 are sandwiched between these bolts. It means that the bending stiffness and shear stiffness in the case of being joined at 74 are equal to or greater than the stiffness in the axial direction. In this case, the flexural rigidity and the shear rigidity are the joint portion of the bolt 74 where they are the smallest.

[Action]
Next, the operation of this embodiment will be described.

The plurality of vibration isolating members 300 of the vibration isolating device 70 of this embodiment shown in FIG. The shear stiffness is set to be equal to or greater than the bending stiffness and shear stiffness of the upper frame 72 and the lower frame 73 including the bolts 74 .

Therefore, vibration in the axial direction (vertical direction) transmitted from the equipment 82 to the slab 80 via the vibration isolator 70 is reduced by the vibration isolator 300 . Specifically, the elastic deformation of the curved second plate 220 of the unit 210 of the anti-vibration member 300 reduces vibration in the axial direction.

On the other hand, the bending rigidity and shear rigidity of the vibration isolating member 300 are set to be equal to or greater than those of the upper frame 72 and the lower frame 73 including the bolts 74 . Therefore, in the event of an earthquake, horizontal and bending displacements of the lower suspension members 53 with respect to the axial direction are small, so that the equipment 82 does not sway laterally.

<Others>
It should be noted that the present invention is not limited to the above embodiments.

For example, in the anti-vibration members 100, 200, and 300 of the above-described embodiments, the rigidity in the axial direction is reduced by a member that elastically deforms in the axial direction (the face member 130 or the second plate 220), but the present invention is not limited to this. For example, the anti-vibration member is a thinned structure having an anisotropic rigidity in which the cross section of the member that bears the bending force and shear force is large and the cross section of the member that bears the force in the axial direction is reduced. There may be. Alternatively, the anti-vibration member may be a thinned structure having an anisotropic rigidity obtained by thinning a virtual solid body so that the axial rigidity becomes smaller than the bending rigidity and the shearing rigidity become smaller.

Further, for example, the vibration-isolating members 100, 200, and 300 of the above-described embodiments use mechanical metamaterial technology, but the present invention is not limited to this. For example, the anti-vibration member may use topology optimization techniques or other techniques. The point is that the vibration-isolating member has an axial rigidity smaller than that of the support member, and a bending rigidity and a shear rigidity equal to or higher than those of the support member.

Further, for example, the vibration-isolating members 100, 200, and 300 of the above-described embodiments are made of synthetic resin, but are not limited to this. For example, it may be a metal anti-vibration member.

Further, for example, in the embodiments, the vibration-isolating member is used for a suspended ceiling and a vibration-isolating device for equipment, but the present invention is not limited to this. For example, a vibration isolation member may be used to suppress rolling of the soundproof room. Specifically, a vibration isolation member may be provided between the wall of the outer room and the wall of the inner room of the nested structure.

In addition, when each rigidity of the supporting member joined to one and the other axial direction of the vibration isolating member is different, the rigidity of the smaller one is adopted.

Further, for example, the vibration-isolating members 100, 200, and 300 of the above-described embodiments are made of synthetic resin, but are not limited to this. For example, it may be a metal anti-vibration member.

Furthermore, various aspects can be implemented without departing from the gist of the present invention. A plurality of embodiments, modifications, and the like can be appropriately combined and implemented.

50 Suspension member (an example of anti-vibration structure)
52 Upper suspension member (an example of a support member)
53 lower hanging member (an example of a supporting member)
60 Suspension member (an example of anti-vibration structure)
70 anti-vibration device (an example of anti-vibration structure)
72 upper mount (an example of a support member)
73 Lower mount (an example of a support member)
74 bolt (an example of a support member)
REFERENCE SIGNS LIST 100 anti-vibration member 110 cylindrical body 112A inner peripheral surface 120 shaft portion 130 face member 132 outer edge portion 200 anti-vibration member 210 unit 212 first plate 220 second plate 250 structure 255 structure 257 structure 300 anti-vibration member

Claims (3)

A vibration-isolating structure comprising a vibration-isolating member and supporting members joined to both axial sides of the vibration-isolating member and arranged coaxially,
the rigidity in the axial direction of the vibration isolating member is smaller than the rigidity in the axial direction of the supporting member;
The flexural rigidity and shear rigidity of the vibration-isolating member are equal to or greater than the flexural rigidity and shear rigidity of the support member.
Anti-vibration structure. The anti-vibration member is
a cylindrical body having therein a shaft portion joined to one of the support members and connected to the other support member;
a plurality of face members provided in the cylindrical body at intervals in the axial direction, the central portion of which is joined to the shaft portion and the outer edge portion of which is joined to the inner peripheral surface of the cylindrical body;
have,
The vibration isolation structure according to claim 1. The anti-vibration member is a lightened structure having rigidity anisotropy, which is hollowed out so that the rigidity in the axial direction is smaller than that of the support member, and the bending rigidity and shear rigidity are equal to or higher than those of the support member. be,
The vibration isolation structure according to claim 1.

Images