JP2007187180A - Dynamic vibration absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structurally simple and inexpensively manufacturable dynamic vibration absorber superior in the vibration damping effect, while facilitating arrangement or installation. <P>SOLUTION: This dynamic vibration absorber 20 can be inexpensively manufactured with an extremely simple structure since a triangular vibration plate 21 itself constitutes a vibrator (a mass body and a spring) for damping vibration of a control object. Since a shape of the vibration plate 21 is formed in a triangular shape, even if its three corner parts are restricted by a bolt 22 and nuts 23 and 24, the effective mass ratio can be secured large since a degree of restraining its out-of-plane flexural vibration is smaller than when the vibration plate is a quadrangular shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dynamic vibration absorber that is attached to a vibration suppression object and dampens the vibration suppression object by vibrating at a natural frequency equal to or synchronized with the vibration frequency of the vibration suppression object. The present invention relates to a dynamic vibration absorber that is easy to install or attach and has an excellent vibration damping effect, but has a simple structure and can be manufactured at low cost.

  Conventionally, in order to control the vibration of the vibration control object, (1) a mass body is arranged in a place where the vibration of the vibration control object is large, and the vibration is reduced by the mass effect. The structural rigidity is increased by reinforcing materials such as ribs and stiffeners to reduce the amplitude, or the resonance point is shifted from the normal frequency band. (3) A dynamic vibration absorber made up of a vibrating body consisting of mass and spring and a damping element is controlled. A technique such as attaching to a vibrating object and controlling the vibration by vibration of the vibrating body is used.

Here, as an example of the vibration damping technique (3), the structure of a dynamic vibration absorber described in Patent Document 1 below will be outlined with reference to FIG. The vibration of the surface plate 2 installed on the floor surface of the clean room to be accommodated is controlled in the vertical direction and the front-rear direction (direction perpendicular to the paper surface shown in the figure).
Then, the vibration of the surface plate 2 in the front-rear direction is caused by a first dynamic vibration absorber having a pair of front and rear leaf springs 3a and 3b, a first viscoelastic body 4 and a first mass body 5 suspended from the surface plate 2. And a second dynamic vibration absorber having a pair of upper and lower leaf springs 6, 7, a second viscoelastic body 8, and a second mass body 9 supported by the first mass body 5. The vibration in the vertical direction of the panel 2 is suppressed.

Moreover, when the structure of the dynamic vibration absorber described in the following Patent Document 2 is outlined with reference to FIG. 12, the dynamic vibration absorber 10 is composed of a pair of upper and lower steel plates 11 and 12 extending in parallel with each other in a rectangular shape in plan view. A diaphragm 14 is formed by sandwiching a viscoelastic resin 13, a pair of front and rear weights 15, 15 and a pair of left and right weights 16, 16 are arranged on the upper surface of the diaphragm 14 as shown in the figure, and a support member The structure is attached to the surface of the vibration control object 18 via 17.
Accordingly, when vibration in the vertical direction occurs in the vibration control object 18, the vibration plate 14 vibrates in two out-of-plane bending modes in the front-rear direction and the left-right direction, and the vibration of the vibration suppression object 18 is suppressed.
At this time, the natural frequency of the out-of-plane bending mode in the front-rear direction is determined by the mass of the pair of front and rear weights 15 and 15, and the natural frequency of the out-of-plane bending mode in the left-right direction is determined by the mass of the pair of left and right weights 16, 16. Therefore, the primary and secondary vibrations generated in the vibration control object 18 can be efficiently suppressed.

JP 2000-314441 A JP-A-5-52237

By the way, the dynamic vibration absorber 1 shown in FIG. 11 is attached to the surface plate 2 on which the semiconductor manufacturing apparatus is mounted and absorbs vibrations thereof, and is extremely precise, and thus has a complicated structure and is manufactured. Cost is also high.
Moreover, since it is attached to the joists constituting the bottom surface of the surface plate 2 or the floor of the clean room, it is difficult to additionally install after the clean room is completed and the surface plate 2 is fixed. .

  In addition, the dynamic vibration absorber 10 shown in FIG. 12 forms a diaphragm 14 by sandwiching a viscoelastic resin 13 between a pair of upper and lower steel plates 11, 12, and uses two sets of weights 15, 16 having different masses. Therefore, the structure is complicated and the manufacturing cost is high.

  However, for example, when a vibration is generated in a building due to the addition of a vibration source due to the modification of an existing building, the building can be installed or installed without remodeling, and the vibration control effect is excellent. In some cases, a low-cost dynamic vibration absorber is required.

  Therefore, an object of the present invention is to provide a dynamic vibration absorber that solves the problems of the above-described conventional technology and that is easy to install or attach and has excellent vibration damping effect, but has a simple structure and can be manufactured at low cost. There is.

The means described in claim 1 for solving the above problem is as follows.
A dynamic vibration absorber attached to a vibration damping object that vibrates and absorbs vibration energy of the vibration damping object when the vibrating body vibrates,
The vibrating body is formed on a triangular diaphragm,
And supporting means for supporting the vibration control object so that the vibration plate can vibrate in the out-of-plane direction by engaging with the three corners of the vibration plate, respectively.
The natural frequency of the out-of-plane vibration is set so as to vibrate in synchronization with the vibration of the vibration control object, having the same natural frequency as the vibration control object. It is a feature.

That is, the dynamic vibration absorber according to claim 1 has a very simple structure and a component because the triangular diaphragm itself constitutes a mass body and a spring for damping the controlled object. Since the number of points is small, it can be manufactured at low cost.
In addition, since the shape of the diaphragm is a triangle, even if the three corners are constrained by the support means, the degree of suppressing out-of-plane bending vibration is smaller than when the diaphragm is a quadrangle. The effective mass ratio as the vibrating body can be increased.
Furthermore, when the object to be damped is the floor surface of the building, depending on the amplitude and acceleration of the generated vibration and the weight of the diaphragm, it is only necessary to place this dynamic vibration absorber on the floor surface. Compared to a dynamic vibration absorber, the labor and time required for installation can be drastically reduced.
In addition, by arranging the dynamic vibration absorbers of the present invention in close proximity to each other, the total amount of vibration damping energy can be increased, so that vibration generated in the vibration damping object can be reliably damped. it can.
The shape of the diaphragm can be an equilateral triangle or an isosceles triangle.
Then, by appropriately setting the length, thickness, and material of each side of the triangular diaphragm, an optimal dynamic vibration absorber can be obtained in accordance with the shape and vibration state of the vibration control object.
Further, what is meant by the term “tuning” described in claim 1 is the same as that used in the specifications of “Patent No. 3246373”, “Patent No. 2552432”, and the like. The details are described in, for example, “6.6 TMD” of “Hiroki Yamaguchi: Structural Vibration and Control: Kyoritsu Publishing: May 20, 1996”.

  According to a second aspect of the present invention, there is provided the dynamic vibration absorber according to the first aspect, wherein the support means is a bolt inserted through insertion holes formed in three corners of the diaphragm. And a pair of nuts that are screwed into these bolts to sandwich the diaphragm.

That is, in the dynamic vibration absorber according to claim 2, the supporting means is constituted by a bolt and a nut, and it is only necessary to penetrate the diaphragm through an insertion hole for inserting the bolt. Can be manufactured at an extremely low cost.
Moreover, since the dimension which the front-end | tip of a volt | bolt protrudes from the surface of a diaphragm can be adjusted freely, the distance between a damping object and a diaphragm can be changed easily.
Thereby, for example, when a convex portion exists on the surface of the vibration control object, the vibration plate can be arranged away from the vibration control object so that the vibration plate does not contact the convex portion. .
On the other hand, when another structure exists so as to face the surface of the object to be damped, the diaphragm is brought close to the object to be damped so that the diaphragm does not contact this structure. Can be arranged.
In addition, a plurality of dynamic vibration absorbers having different distances between the object to be damped and the vibration plate are prepared, and the vibration plate of the dynamic vibration absorber and the bolts of the triangular vibration plate are prevented from interfering with each other. By disposing each corner portion in a shifted manner, a plurality of diaphragms can be arranged in a multilayer structure and installed on the object to be controlled, so that the amount of vibration suppression energy per unit area can be greatly increased. .
Needless to say, a washer or a similar restraining plate can be interposed between each nut and the diaphragm. In this case, the out-of-plane bending stiffness at the corners of the diaphragm is changed by changing the dimensions of the washer or restraint plate, such as the outer diameter and thickness, and the natural frequency of out-of-plane bending vibration generated in the diaphragm is changed. It can also be changed.

  According to a third aspect of the present invention, in the dynamic vibration absorber according to the first or second aspect, the insertion hole has a distance from the corner portion at each of the three corner portions of the diaphragm. It is characterized by being penetrated at a plurality of different positions.

That is, in the dynamic vibration absorber according to claim 3, by selecting which of the plurality of insertion holes penetrating each corner portion of the diaphragm to insert the bolt into the diaphragm, The natural frequency of the generated out-of-plane bending vibration can be changed.
As a result, it is possible to reliably resonate the vibration of the vibration suppression object and the vibration of the diaphragm to absorb the vibration energy and to suppress the vibration suppression object.

  According to a fourth aspect of the present invention, in the dynamic vibration absorber according to the second or third aspect, the base end of the bolt is fixed to the vibration damping object.

That is, in the dynamic vibration absorber according to the fourth aspect, the vibration plate can be firmly supported with respect to the vibration suppression object, so that the vibration generated in the vibration suppression object is reliably transmitted to the vibration plate. The diaphragm can be vibrated.
Also, when the surface to which the diaphragm is attached is tilted with respect to the horizontal plane among the objects to be controlled, when extending vertically, or when facing downward in the vertical direction like the ceiling of a building In addition, the diaphragm can be securely attached.

The means described in claim 5 is the dynamic vibration absorber according to claim 1,
The supporting means is a rod-like member fixed to a corner portion of the diaphragm and extending perpendicularly to the surface of the diaphragm.

  That is, since the dynamic vibration absorber according to claim 5 is composed of a triangular diaphragm and three rod-shaped members, its structure is further simplified and manufactured at a lower cost. Can do.

  According to a sixth aspect of the present invention, in the dynamic vibration absorber according to any one of the first to fifth aspects, the diaphragm is in the vicinity of the corner portion of the dynamic vibration absorber, and the central portion thereof is more than the support means. It is characterized by having a reduced thickness part in the side part.

If the corner portion of the diaphragm is supported by the support means, the out-of-plane bending displacement of the diaphragm at the corner portion is restrained, so that it may be possible to prevent free out-of-plane bending vibration of the diaphragm.
At this time, in the dynamic vibration absorber according to the sixth aspect, a thinned portion is provided in the vicinity of the corner portion of the diaphragm and closer to the center portion of the diaphragm than the support means. Bending rigidity is reduced.
As a result, even if the corners of the diaphragm are constrained by the support means, the free out-of-plane bending vibration of the diaphragm is not disturbed, so that the vibration of the object to be controlled and the vibration of the diaphragm are reliably resonated. Alternatively, it is possible to absorb vibration energy in synchronism and reliably control the object to be controlled.

  According to a seventh aspect of the present invention, in the dynamic vibration absorber according to any of the second to fourth aspects, the support means is fitted on the bolt and makes line contact with both surfaces of the diaphragm. A pair of wedge-shaped members is further provided, and the pair of nuts sandwich the diaphragm via the wedge-shaped members.

That is, the dynamic vibration absorber described in claim 7 has a structure in which each corner portion of the triangular diaphragm is sandwiched and fixed by a pair of wedge-shaped members.
As a result, the degree of obstructing the free out-of-plane bending vibration of the diaphragm is small compared to the case where the corners of the diaphragm are directly sandwiched by a pair of nuts whose flat bottoms are flat. It is possible to reliably resonate or synchronize the vibration and the vibration of the diaphragm so as to absorb vibration energy, and to surely control the object to be controlled.

  According to a eighth aspect of the present invention, the dynamic vibration absorber according to any of the first to seventh aspects further includes an adjustment weight attached to a central portion of the dynamic vibration absorber to adjust the natural frequency of the diaphragm. It is characterized by that.

That is, in the dynamic vibration absorber according to claim 8, the natural frequency of the out-of-plane bending vibration generated in the diaphragm by attaching the adjusting weight to the center of the diaphragm or changing the weight of the adjusting weight to be attached. Can be changed.
Accordingly, it is possible to reliably resonate or synchronize the vibration of the vibration suppression object and the vibration of the diaphragm to absorb the vibration energy, thereby reliably suppressing the vibration of the vibration suppression object.

  As is clear from the above description, according to the present invention, it is possible to provide a dynamic vibration absorber that is easy to install or attach and is excellent in vibration damping effect, yet has a simple structure and can be manufactured at low cost.

  Hereinafter, with reference to FIGS. 1-10, each embodiment of the dynamic vibration damper which concerns on this invention is described in detail. In the following description, the same parts are denoted by the same reference numerals, and redundant description is omitted.

1st Embodiment First, with reference to FIGS. 1-4, the dynamic vibration damper of 1st Embodiment is demonstrated.

The dynamic vibration absorber 20 of the first embodiment shown in FIG. 1 and FIG. 2 is attached to a vibration suppression object and vibrates at a natural frequency equal to the vibration frequency of the vibration suppression object or at an optimum tuning frequency. A dynamic vibration absorber that dampens an object to be damped by vibrating, and having a regular triangular diaphragm 21 whose natural frequency is set so as to resonate or synchronize with the frequency of the object to be damped; Supporting means for supporting the diaphragm on the object to be controlled so that the diaphragm 21 vibrates out of plane with respect to the vibration direction of the object to be controlled, and engaging each of the three corners of the diaphragm. I have.
The supporting means includes bolts 22 respectively inserted into insertion holes (not shown) penetrating through the three corners of the diaphragm 21, and screwed into these bolts 22 to attach the diaphragm 21. It is comprised from a pair of nuts 23 and 24 to clamp.

The diaphragm 21 can be most commonly manufactured from a thick steel plate, but other metal materials such as aluminum, copper and brass, or a polymer material such as polycarbonate and polyethylene in accordance with the characteristics of the object to be damped. It can also be a thin plate manufactured from
Further, as shown in FIG. 2, the natural frequency is a vibration suppression target by changing the values of the thickness dimension T, the side length L, and the distance S between the hole through which the bolt 22 is inserted and the corner portion. It is possible to match the resonance frequency with the object.
And since the diaphragm 21 can be easily manufactured by cutting out from the raw material plate material, the manufacturing cost can be reduced.

  Further, the support means is composed of the bolt 22 and the nuts 23 and 24, and only has to be provided in the diaphragm 21 with an insertion hole (not shown) through which the bolt 22 is inserted. Can be manufactured.

That is, the dynamic vibration absorber 20 of the first embodiment has an extremely simple structure because the equilateral triangular diaphragm 21 itself constitutes an additional mass and a spring for damping the controlled object. And since the number of parts is small, it can be manufactured at low cost.
Moreover, since the shape of the diaphragm 21 is an equilateral triangle, even if the three corners are constrained by the bolts 22 and the nuts 23 and 24, the out-of-plane bending vibration is suppressed as compared with the case of the quadrangular shape. The degree is small.

Moreover, since the value of the dimension C by which the bolt 22 projects downward from the lower surface of the diaphragm 21 can be freely adjusted, the distance between the surface of the vibration control object and the diaphragm 21 can be easily changed. Can do.
Accordingly, as shown in FIG. 2A, for example, when the convex portion B1 is present on the surface of the vibration suppression target, the diaphragm 21 is prevented from contacting the convex portion B1. 21 can be spaced apart from the object to be controlled.
On the contrary, when another structure B2 exists above the object to be damped, the diaphragm 21 is brought close to the object to be damped so that the diaphragm 21 does not contact the structure B2. Can be arranged.

In addition, when the object to be controlled is the floor surface of the building, it is only necessary to place the dynamic vibration absorber 20 on the floor surface, and the time and effort required for installation compared to the conventional dynamic vibration absorber are reduced. It can be extremely reduced.
In addition, as shown in FIG. 3, the vibration damping energy amount per unit floor area can be increased by arranging the dynamic vibration absorbers 20 of the first embodiment close to each other in parallel. The vibration generated on the floor surface can be reliably suppressed.

Further, as shown in FIG. 4, three types of dynamic vibration absorbers 20A, 20B, and 20C having different values of the dimension C from which the bolt 22 protrudes downward from the lower surface of the diaphragm 21 are prepared, and these dynamic vibration absorbers are prepared. The corners of each diaphragm 21 can be arranged so as to be shifted so that the twenty diaphragms 21 and the bolts 22a, 22b, 22c do not interfere with each other.
Thereby, since the plurality of diaphragms 21 can be arranged in a multilayer structure and installed on the floor surface of the building, vibration generated on the floor surface can be reduced by significantly increasing the amount of vibration suppression energy per unit floor area. The vibration can be reliably controlled.

Second Embodiment Next, a dynamic vibration absorber according to a second embodiment will be described with reference to FIG.

  The dynamic vibration absorber 30 of the second embodiment shown in FIG. 5 is provided with a number of insertion holes through which the bolts 22 are inserted and the vibration absorber 20 of the first embodiment described above. The difference is that an adjustment weight 32 for adjusting the natural frequency of the plate 31 is provided.

In addition to the insertion hole through which the bolt 22 is actually inserted, the diaphragm 31 includes two insertion holes 31a and 31b having different values of the dimension S from the corner (see FIG. 2B). Each corner is penetrated.
Thereby, the natural frequency of the out-of-plane bending vibration generated in the diaphragm 31 can be changed by selecting which of the three insertion holes penetrating each corner is to be inserted into the bolt 22. it can.

The adjustment weight 32 disposed at the center of the diaphragm 31 is detachable from the diaphragm 31 by a bolt 33.
As a result, the adjustment weight 32 having a different weight can be easily attached to the center of the diaphragm 31, and therefore the natural frequency of the out-of-plane bending vibration generated in the diaphragm 31 is optimally adjusted according to the object to be damped. Can do.

  That is, in the dynamic vibration absorber 30 of the second embodiment, after the diaphragm 31 is manufactured by changing the insertion hole through which the bolt 22 is inserted or by changing the weight of the adjustment weight 32, the out-of-plane bending thereof is performed. Since the natural frequency of the vibration can be changed, the vibration of the object to be controlled and the vibration of the diaphragm 31 are reliably resonated or tuned to absorb vibration energy, and the object to be controlled is reliably controlled. It becomes possible.

3rd Embodiment Next, with reference to FIG. 6 (A) and FIG. 7, the dynamic vibration damper of 3rd Embodiment is demonstrated.

The shape of the diaphragms 21 and 31 in the first and second embodiments described above was a perfect equilateral triangle.
On the other hand, the diaphragm 41 in the dynamic vibration absorber 40 of the third embodiment is a part of the corner portions 41a, 41b, 41a, 41b, from the raw material plate material as shown in FIG. 41c is cut out.
As shown in FIG. 7, three rod-like members 42 a, 42 b, 42 c are fixed to the corners of the vibration plate 41 by welding to constitute support means for supporting the vibration plate 41. Yes.

  That is, the dynamic vibration absorber 40 according to the third embodiment is configured by the substantially triangular diaphragm 41 and the three rod-like members 42a, 42b, and 42c. It can be manufactured at a lower cost.

4th Embodiment Next, with reference to FIG. 6 (B) and FIG. 8, the dynamic vibration damper of 4th Embodiment is demonstrated.

The shape of the diaphragms 21 and 31 in the first and second embodiments described above was a perfect equilateral triangle.
On the other hand, as shown in FIG. 6B, the diaphragm 51 in the dynamic vibration absorber 50 of the fourth embodiment has rectangular extension portions 52a, 52b, and 52c at the corners of the regular triangle. It is added.
Bolt insertion holes 53a, 53b, and 53c are respectively provided through these extended portions 52a, 52b, and 52c.

Further, in the dynamic vibration absorber 50 of the fourth embodiment, as shown in FIG. 8, the base end of the dynamic vibration absorber 50 is screwed or planted on the surface of the vibration control object B and is upright. The two diaphragms 51A and 51B are integrally supported.
More specifically, after the lower nut 55 is screwed onto the bolt 54, the insertion hole 53a of one diaphragm 51A and the bolt 54 are aligned, and the extended portion 52a is placed on the lower nut 55. Then, an annular spacer 56 is externally fitted to the bolt 54 and stacked on the diaphragm 51A. Further, the insertion hole 53b of the other diaphragm 51B and the bolt 54 are aligned, and the extended portion 52b is placed on the spacer 56. Finally, the upper nut 57 is screwed onto the bolt 54 and finally tightened together.
The structure for supporting the other corners of the two diaphragms 51A and 51B is exactly the same.

That is, in the dynamic vibration absorber 50 of the fourth embodiment, the base ends of the bolts 54 for supporting the corner portions of the pair of diaphragms 51A and 51B on the object to be damped are the vibration object B. It is fixed by screwing or being implanted on the surface.
As a result, the pair of diaphragms 51A and 51B can be firmly supported with respect to the object to be controlled, so that the vibration generated in the object to be controlled is reliably transmitted to each diaphragm to resonate the diaphragm. Or it can be tuned.
Moreover, when the surface which attaches a pair of diaphragm 51A, 51B among the vibration suppression objects is inclined with respect to a horizontal surface, or when it extends in the vertical direction, the vertical direction as in the ceiling surface of a building is further provided. Even when facing downward, these diaphragms can be securely attached to 51A and 51B.

Furthermore, in the dynamic vibration absorber 50 of the fourth embodiment, bolts 54, nuts 55, 57 and spacers 52a, 52b, 52c respectively extending at the corners of the pair of diaphragms 51A, 51B are provided. The structure is supported by 56.
Accordingly, since the out-of-plane bending displacement of the triangular main body portion of each of the vibration plates 51A and 51B is not restrained, the degree of hindering the out-of-plane bending vibration generated in these main body portions is reduced, and the vibration suppression object and Each diaphragm 51A, 51B can be reliably resonated or tuned.

Fifth Embodiment Next, a dynamic vibration absorber according to a fifth embodiment will be described with reference to FIG.

  The dynamic vibration absorber 60 of the fifth embodiment is different from the dynamic vibration absorber 50 of the fourth embodiment described above in that a pair of diaphragms 51A and 51B are provided with thinned portions 61 and 61 in the vicinity of the corners, respectively. It is different in having it.

More specifically, as shown in FIG. 9, the thinned portions 61 and 61 are formed by concave grooves 61a and 61b that are recessed on the upper and lower surfaces of the diaphragms 51A and 51B and extend in parallel to each other. The bending rigidity of this part is lowered.
The concave grooves 61a and 61b extend in a direction perpendicular to the straight line D that bisects the angle formed by the two sides constituting the corners of the substantially triangular diaphragms 51A and 51B. .

That is, in the dynamic vibration absorber 60 of the fifth embodiment, each of the diaphragms 51A and 51B is in the vicinity of the corner and is supported by the bolt 54, the nuts 55 and 57, and the spacer 56. Also has thinning portions 61A and 61B at positions closer to the center.
Accordingly, free out-of-plane bending vibrations of the triangular main body portions of the diaphragms 51A and 51B are not disturbed, so that the vibration of the vibration control object and the diaphragms 51A and 51B are reliably resonated or tuned. Thus, the vibration energy can be absorbed and the object to be controlled can be reliably controlled.

6th Embodiment Next, with reference to FIG. 10, the dynamic vibration damper of 6th Embodiment is demonstrated.

  The dynamic vibration absorber 70 of the sixth embodiment is different from the dynamic vibration absorber 60 of the fifth embodiment described above in the structure for supporting the corners of the diaphragm 71.

More specifically, the diaphragm 71 shown in FIG. 10 has a rectangular extension 72 added to the corner thereof, just like the diaphragm 51 shown in FIG. 6B. The extending portion 72 is provided with an insertion hole 73a through which the bolt 54 is inserted.
Further, on the upper surface and the lower surface of the extended portion 72, concave grooves 73 b and 73 c that extend perpendicularly to a straight line D that bisects the angle formed by the two sides constituting the corner portion of the substantially triangular diaphragm 71. Are recessed.
Note that the cross-sectional shapes of the concave grooves 73b and 73c are V-shaped with a large opening angle.

Further, a pair of upper and lower wedge-shaped members 74 and 75 having convex corner portions that are in line contact with the concave corner portions in the concave grooves 73b and 73c are fitted on the bolts 54 that support the vibration plate 71, respectively.
The upper and lower nuts 55 and 57 screwed to the bolt 54 sandwich the extending portion 72 of the diaphragm 71 via the wedge-shaped members 74 and 75.

That is, the dynamic vibration absorber 70 of the sixth embodiment has a structure in which each corner portion of the substantially triangular diaphragm 71 is sandwiched and fixed by the pair of wedge-shaped members 74 and 75.
Thereby, compared with the case where the corners of the diaphragm 71 are directly sandwiched by the pair of nuts 55 and 57 whose bottom surfaces are flat, the degree of preventing free out-of-plane bending vibration of the diaphragm 71 is small. It is possible to reliably resonate or synchronize the vibration of the vibration suppression object B and the vibration of the vibration plate 71 to absorb the vibration energy and reliably control the vibration suppression object B.

As mentioned above, although each embodiment of the dynamic vibration damper which concerns on this invention was described in detail, it cannot be overemphasized that this invention is not limited by embodiment mentioned above and a various change is possible.
For example, the diaphragm in each of the embodiments described above is manufactured from a single raw material such as a thick steel plate.
On the other hand, it goes without saying that the diaphragm can be manufactured from a material such as a vibration-damping steel sheet in which a viscoelastic resin is sandwiched between the prior arts described with reference to FIG. In this case, since the diaphragm vibrates with appropriate attenuation, it is possible to obtain a dynamic vibration absorption effect based on the optimum tuning theory.

The whole perspective view which shows the dynamic vibration damper of 1st Embodiment. The whole side view (A) and whole top view (B) which show the dynamic vibration damper shown in FIG. The perspective view which shows the state which arranged the dynamic vibration absorber of 1st Embodiment in parallel on the floor surface of a building. The perspective view which shows the state which laminated | stacked the dynamic vibration damper of 1st Embodiment, and was installed on the floor surface of a building. The whole perspective view which shows the dynamic vibration damper of 2nd Embodiment. The top view (A) which shows the modification of a diaphragm, and the top view (B) which shows the other modification of a diaphragm. The whole perspective view which shows the dynamic vibration damper of 3rd Embodiment. The principal part enlarged plan view (A) and principal part enlarged side view (B) which show the dynamic vibration damper of 4th Embodiment. The principal part enlarged plan view (A) and principal part enlarged side view (B) which show the dynamic vibration damper of 5th Embodiment. The principal part enlarged plan view (A) and principal part enlarged side view (B) which show the dynamic vibration damper of 6th Embodiment. The figure which shows the dynamic vibration damper described in Unexamined-Japanese-Patent No. 2000-314441. The figure which shows the dynamic vibration damper described in Unexamined-Japanese-Patent No. 5-52237.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dynamic vibration absorber described in Unexamined-Japanese-Patent No. 2000-314441 10 Dynamic vibration absorber described in Unexamined-Japanese-Patent No. 5-52237 20 Dynamic vibration absorber of 1st Embodiment 21 Diaphragm 22 Bolt 23, 24 Nut 30 Dynamic Absorber of Second Embodiment 31 Diaphragm 32 Adjusting Weight 33 Bolt 40 Dynamic Absorber of Third Embodiment 41 Vibrating Plate 42 Bar-Shaped Member 50 Dynamic Absorber of Fourth Embodiment 51 Vibrating Plate 52a, 52b, 52c Extension Installation portion 53a, 53b, 53c Bolt insertion hole 54 Bolt 55, 57 Nut 56 Spacer 60 Dynamic vibration absorber of the fifth embodiment 61 Thinning portion 61a, 61b Concave groove 70 Dynamic vibration absorber of the sixth embodiment 71 Diaphragm 72 Extension Installation part 73a Insertion hole 73b, 73c V-groove 74, 75 Wedge-shaped member

Claims (8)

A dynamic vibration absorber attached to a vibration damping object that vibrates and absorbs vibration energy of the vibration damping object when the vibrating body vibrates,
The vibrating body is formed on a triangular diaphragm,
And supporting means for supporting the vibration control object so that the vibration plate can vibrate in the out-of-plane direction by engaging with the three corners of the vibration plate, respectively.
The natural frequency of the out-of-plane vibration is set so as to vibrate in synchronization with the vibration of the vibration control object, having the same natural frequency as the vibration control object. Characteristic dynamic vibration absorber. The support means is
Bolts respectively inserted through insertion holes penetrating the three corners of the diaphragm;
A pair of nuts that are screwed into these bolts and sandwich the diaphragm,
The dynamic vibration absorber according to claim 1, wherein:   3. The dynamic vibration absorber according to claim 2, wherein each of the three through-holes of the diaphragm is provided with a plurality of insertion holes at a plurality of positions at different distances from the corners. .   The dynamic vibration absorber according to claim 2 or 3, wherein a base end of the bolt is fixed to an object to be controlled.   2. The dynamic vibration absorber according to claim 1, wherein the support means is a rod-like member fixed to a corner portion of the diaphragm and extending perpendicularly to the surface of the diaphragm.   6. The diaphragm according to claim 1, further comprising a thinned portion in the vicinity of the corner portion of the diaphragm and closer to the center portion than the support means. Dynamic vibration absorber. The support means further includes a pair of wedge-shaped members that are fitted onto the bolts and are in line contact with both surfaces of the diaphragm,
The dynamic vibration absorber according to any one of claims 2 to 4, wherein the pair of nuts sandwich the diaphragm via the wedge-shaped members.   The dynamic vibration absorber according to any one of claims 1 to 7, further comprising an adjustment weight attached to a central portion thereof for adjusting a natural frequency of the diaphragm.

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