JPH0526294A - Dynamic vibration absorbing device - Google Patents

Abstract

PURPOSE:To provide a dynamic vibration reducing device to effectively damp vibration without using a slide guide member, does not need an installation place so much, and reduces the generation of noise occasioned by vibration. CONSTITUTION:A dynamic vibration reducing device 1 comprises plate-form resilient members 2 and 3, arranged facing each other, and a viscoelastic member 4 arranged between plate-form resilient members 2 and 3 so that a shearing stress is generated at the interior along the plate surfaces of the plate-form resilient members 2 and 3 through bending of the plate-form members 2 and 3. Further, a mounting member 11 formed such that the one end is secured to the plate-form resilient members 2 and 3 so that the plate-form members 2 and 3 are supported in a state that the outer peripheral ends of the plate-form resilient members 2 and 3 form a free end and the other end is mounted on a floor 9 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the damping of forcible vibrations due to some cause of structures such as floors, bridges, and the main body of a building, an apartment house or a general house, and the foundation thereof. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device, a so-called dynamic vibration damping device (dynamic damper).

[0002]

2. Description of the Related Art Generally, this type of dynamic vibration absorbing device includes a coil spring member, a weight connected to the coil spring member, and an energy absorbing device for absorbing the vibration energy of the weight.
And a sliding guide member for guiding the original vibration of the weight by preventing the weight from unintentionally swinging during the vibration damping operation.

[0003]

By the way, since the conventional dynamic vibration absorbing device is provided with the sliding guide member for the weight as described above, the guide surface of the sliding guide member for the weight is not sufficiently smooth. Then, the vibration of the weight is transmitted to the structure supporting the sliding guide member via the sliding guide member. This structure is often in general the object that is actually to be damped, so that in the case mentioned above it may give rise to secondary vibrations. Further, when the sliding guide member is provided, the vibration with small acceleration cannot overcome the frictional resistance force between the weight and the sliding guide member,
As a result, in such a vibration, the vibration energy of the weight is directly transmitted to the sliding guide member without being absorbed by the energy absorbing device, and the vibration with a small acceleration generated in the structure is not effectively attenuated. Become. Further, since the conventional dynamic vibration absorber is provided with the sliding guide member as described above, it requires a large installation place and is difficult to apply to the floor of a general house.

In addition, in many cases, noise is generated due to the vibration, but it is difficult for the conventional dynamic vibration absorbing device to effectively eliminate the noise.

The present invention has been made in view of the above points, and it is an object of the present invention to effectively damp the vibration of a structure without using a sliding guide member. It is an object of the present invention to provide a dynamic vibration absorbing device that does not require a lot of space and can reduce noise caused by vibration.

[0006]

According to the present invention, the above object is to provide at least a pair of plate-like elastic members arranged to face each other,
The viscoelastic members arranged between the plate-like elastic members so that shear stress along the plate surface of the plate-like elastic member is internally generated by bending the plate-like elastic member, and the outer peripheral end of the plate-like elastic member is set as a free end. And a pair of plate-like elastic members are supported by the plate-like elastic member, one end of which is fixed to the plate-like elastic member and the other end of which is attached to the vibration source. It

In one preferable example of the present invention, a weight is attached to the plate-like elastic member. By attaching this weight, the cycle of vibrations that can be absorbed by the dynamic vibration absorbing device can be adjusted preferably. Such adjustment can also be performed by plate members sandwiching a pair of plate-like elastic members.

In another preferable example of the present invention, the plate-like elastic member is formed in a disk shape, and one end of the mounting member is fixed to substantially the center of the plate-like elastic member.

Examples of the viscoelastic member in the present invention include urethane-based polymer materials, olefin-based polymer materials, silicon-based polymer materials, and high-damping rubber mixed with asphalt, but other members may also be used. Of course it's good. In the case of a viscoelastic member using rubber, it is preferable to bond this to a plate-shaped elastic member by vulcanization adhesion, but bending of the plate-shaped elastic member causes internal shear stress along the plate surface of the plate-shaped elastic member. Alternatively, the pair of plate-like elastic members and the viscoelastic member may be joined to each other by another joining method. It goes without saying that the combination of the pair of plate-like elastic members and the viscoelastic member may be embodied by so-called damping steel plates.

In the present invention, it is sufficient that at least one combination of the plate-like elastic member and the viscoelastic member is attached to the structure through at least one attaching member.
Therefore, according to the present invention, for example, the mounting member may be provided with a combination of a plurality of pairs of plate-like elastic members and viscoelastic members, and in this case, each of the plurality of natural vibration periods of the structure is It is advisable to form each set of a combination of a pair of plate-like elastic members and a viscoelastic member so as to be responsible for damping. By the way, the example of the above combination is a three-layer structure consisting of a pair of plate-like elastic members and viscoelastic members, for example, three or more layers by alternately arranging the plate-like elastic members and viscoelastic member members, That is, it goes without saying that it may be a combination of a multi-layer plate elastic member and a viscoelastic member. In other words, according to the present invention, at least a pair of plate-like elastic members arranged to face each other and a viscoelastic member arranged between the plate-like elastic members may be provided.

In the present invention, as described above, it is preferable that the plate-like elastic member is formed into a disc shape, but the shape is not particularly limited to this, and various shapes such as square, rectangle and ellipse are possible. Good. And the viscoelastic member does not need to be arranged over the entire space between the plate-like elastic members,
It may be arranged in a distributed manner. Further, the weights provided for adjusting the vibration cycle for absorbing the vibration do not necessarily have to be arranged at the peripheral portion of the plate-like elastic member or over the entire peripheral portion, and may be dispersed, and in some cases other than the peripheral portion. It may be arranged and provided in the.

When the dynamic vibration absorbing device of the present invention has a more effective sound absorbing effect, a sound absorbing material such as felt may be attached to the surface of the plate-like elastic member facing the floor or the like, or The surface of the elastic member may be an uneven sound absorbing surface.

[0013]

The dynamic vibration absorbing device of the present invention is attached to a structure, for example, a floor of a house, through a mounting member. Then, when the floor of the house is vibrated by, for example, walking of a person, this vibration is transmitted to a combination body of a pair of plate-like elastic members and a viscoelastic member, which are arranged opposite to each other, through one end of the mounting member. With the fulcrum as a fulcrum, the free ends of the pair of plate-like elastic members vibrate with the phase shifted by about 90 ° with respect to the natural frequency of the floor. Due to the bending of the plate-shaped elastic member caused by this vibration, shear stress is generated inside the viscoelastic member along the plate surface of the plate-shaped elastic member, and viscous shear stress of the viscoelastic member generates vibration energy as much as possible. It decays quickly. Further, due to the viscous shear stress of the viscoelastic member, the vibration of the plate-like elastic member is quickly attenuated after the vibration of the floor is suppressed.

The present invention will be described below based on preferred embodiments shown in the drawings. This will make the above invention and other inventions clear. The present invention is not limited to these specific examples.

[0015]

SPECIFIC EXAMPLE In FIG. 1, a dynamic vibration absorbing device 1 of the present example comprises a pair of plate-like elastic members 2 and 3 arranged to face each other, and a viscoelastic member arranged between the plate-like elastic members 2 and 3. 4 and one end 6 is fixed to the plate-like elastic members 2 and 3 via a nut 7 so as to support the pair of plate-like elastic members 2 and 3 with the outer peripheral ends 5 of the plate-like elastic members 2 and 3 being free ends. The other end 8 is provided with a mounting member 11 mounted on a lower surface 10 of a floor 9 of a house, for example, as a structure.

Plate-like elastic members 2 and 3 and viscoelastic member 4
Is formed in a disk shape in this example, and
One end 6 is fixed to the central portion (fulcrum) of the disk-shaped plate-shaped elastic members 2 and 3. The thickness t of each of the plate-like elastic members 2 and 3, the distance from the fulcrum to the free end, that is, the radius r, is the cycle of the vibration to be absorbed, that is, the natural vibration of the floor 9 to which the main vibration absorbing device 1 is applied. The phase is set to be shifted by 90 ° with respect to the cycle, and as an example, a thickness of 3 mm, a radius of 250 mm, and a mass of 4.6 kg can be exemplified.

The viscoelastic member 4 of this embodiment is made of a thin rubber member, and both surfaces 12 and 13 thereof are firmly bonded to the plate-shaped elastic members 2 and 3 by vulcanization adhesion. As a result of the viscoelastic member 4 being strongly and rigidly bonded to the plate-like elastic members 2 and 3, the bending of the plate-like elastic members 2 and 3 causes viscous shear stress along the plate surface of the plate-like elastic member, that is, It is generated inside the viscoelastic member 4 along the direction A.

In this example, the mounting member 11 is a rod-shaped portion having a reduced diameter portion 14, in other words, a columnar portion 15, a base portion 16 connected to the columnar portion 15, and a tip end of the columnar portion 15. And the through holes 18 and 19 of the plate-like elastic members 2 and 3 and the viscoelastic member 4 respectively.
And 20 are arranged, and the nut 7 is screwed onto the external thread portion 17, whereby the plate-like elastic members 2 and 3 and the viscoelastic member 4 are firmly fixed to the one end 6 of the mounting member 11. The base 16 is fixed to the floor 9 via screws 21 etc., and thus the mounting member 11 is attached to the floor 9 at the other end 8.
Is attached to the lower surface 10 of the. In addition, the floor 9 generally does not have only one natural vibration period but has a plurality of vibration modes. Therefore, the dynamic vibration absorbing device 1 of the present example formed in this way has a vibration mode of the vibration mode to be absorbed. It is placed on the floor 9 where the belly occurs.

The operation will be described below. When a vibration in the B direction is generated on the floor 9 due to a person walking or the like, this vibration is transmitted to the plate-like elastic members 2 and 3 via the mounting member 11, and the plate-like elastic member 2 is then transmitted. 2 and 3 vibrate with one end 6 of the mounting member 11 serving as a fulcrum with a phase shift of 90 ° in the C direction, as shown in FIG.
This vibration causes bending of the plate-shaped elastic members 2 and 3. By this bending of the plate-like elastic members 2 and 3, viscous shear stress is generated inside the viscoelastic member 4 along the plate surfaces of the plate-like elastic members 2 and 3, that is, along the A direction, and Due to the generation of the shear stress, the vibration energy of the plate-like elastic members 2 and 3, and eventually the vibration energy of the floor 9, is attenuated as quickly as possible, and as a result, the vibration of the floor 9 is immediately eliminated.

The disk-shaped plate-like elastic member 2 as in this example is used.
In the case of using, the disk-shaped plate-like elastic member 2 functions as a reflection plate for the vibration sound generated on the floor 9, so that the sound insulation effect can be expected. In addition, the phase of the sound generated as a result of the vibration generated on the floor 9 and the phase of the sound generated as a result of the vibration of the plate-shaped elastic members 2 and 3 are opposite to each other at a position away from the dynamic vibration absorbing device 1. When the distance L between the plate-like elastic member 2 and the plate-like elastic member 2 is set, in other words, when the length of the mounting member 11 is selected, the dynamic vibration-damping device 1 also has a sound deadening function. The vibration noise of can be effectively reduced.

By the way, in the dynamic vibration absorbing device 1 of the above example, the thickness, the radius r, of the plate-like elastic members 2 and 3 and the viscoelastic member 4,
According to the vibration mode to be absorbed due to the mass or the like, in addition to these, as shown in FIGS. 3 and 4, annular weights 41 and 42 are attached to the outer peripheral end 5 of the plate-like elastic members 2 and 3. Therefore, the dynamic vibration absorbing device 50 may be configured so as to be adjusted to operate in the vibration mode in which the vibration is about to be absorbed.

As shown in FIGS. 5 and 6, according to the present invention, the plate-like elastic members 2 and 3 and the viscoelastic member 4 may be a dynamic vibration absorbing device 64 having fan-shaped cavities 61, 62 and 63. In the dynamic vibration absorbing device 64 in which the cavities 61, 62 and 63 are formed, the effective vibration mass is increased, which may be preferable. It should be noted that, without providing such cavities 61, 62 and 63 in all of the plate-like elastic members 2 and 3 and the viscoelastic member 4, for example, only one of the plate-like elastic members 2 and 3 or the viscoelastic member 4 is provided. You may make it provide such a vacant space.

Further, as shown in FIG. 7, a pair of rigid plate members 71 and 7 having a desired diameter inserted into the mounting member 11 are attached.
The plate-like elastic members 2 and 3 and the viscoelastic member 4 may be firmly sandwiched by 2 to form the dynamic vibration absorbing device 73. By using the pair of plate members 71 and 72 in this manner, the free end from the fulcrum can be formed. Adjust the distance to the dynamic vibration absorber 7
It is possible to adjust the cycle of vibrations that can be absorbed by 3.

In the above example, one set of the combination of the plate-like elastic members 2 and 3 and the viscoelastic member 4 is mounted on the mounting member 11, but as shown in FIG. The dynamic vibration absorbing device 83 may be formed by mounting three sets of a combination body including the elastic members 2 and 3 and the viscoelastic member 4 on the mounting member 11 with the spacers 81 and 82 at intervals. According to this example, one dynamic vibration absorbing device 83 can attenuate the vibrations having different natural vibration periods all at once. In the dynamic vibration absorbing device 83, the plate-shaped elastic member 2
And 3 and the viscoelastic member 4 are made to have different diameters so as to damp vibrations of a plurality of different natural vibration periods, but instead of this, a combination of the plate-like elastic members 2 and 3 and the viscoelastic member 4 is used. In the three sets, the thickness or the mass thereof may be changed, or the weights 41 and 42 or the plate members 71 and 72 described above may be provided so that vibrations of a plurality of different natural vibration periods are damped by one dynamic vibration absorbing device. It's good.

Further, as shown in FIG. 9, a plurality of slits 91 extending in the radial direction may be formed in each of the plate-like elastic members 2 and 3 and the viscoelastic member 4 to form the dynamic vibration absorbing device 92. By doing so, the natural frequency can be adjusted.

[0026]

As described above, according to the present invention, the viscoelastic member is internally bent by bending the plate-shaped elastic member due to the vibration on the free end side of the pair of plate-shaped elastic members having one end of the mounting member as a fulcrum. A shearing stress is generated along the plate surface of the plate-like elastic member, and the vibrational energy is attenuated as quickly as possible by the shearing stress of the viscoelastic member. The vibration can be effectively damped, and in addition, it does not require much installation space and, in some cases, the noise accompanying the vibration can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a preferred embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the specific example shown in FIG.

FIG. 3 is a side view of another preferred embodiment of the present invention.

FIG. 4 is a bottom view of the specific example shown in FIG.

FIG. 5 is a bottom view of still another preferred embodiment of the present invention.

6 is a sectional view taken along line VI-VI of the specific example shown in FIG.

FIG. 7 is a side view of a fourth preferred embodiment of the present invention.

FIG. 8 is a side view of the fifth preferred embodiment of the present invention.

FIG. 9 is a bottom view of the sixth preferred embodiment of the present invention.

[Explanation of symbols]

1 Dynamic vibration absorber 2 Plate-shaped elastic member 3 Plate-shaped elastic members 4 Viscoelastic member 9 floors 11 Mounting member

Claims (4)

[Claims] 1. Between at least a pair of plate-like elastic members arranged to face each other, and between the plate-like elastic members so that shear stress along the plate surface of the plate-like elastic member is internally generated by bending of the plate-like elastic members. One end is fixed to the plate-like elastic member and the other end is attached to the vibration source so that the viscoelastic member arranged and the pair of plate-like elastic members are supported with the outer peripheral end of the plate-like elastic member as a free end. And a mounting member formed so as to be formed. 2. The dynamic vibration absorbing device according to claim 1, wherein a weight that adjusts a cycle of vibration to be absorbed is attached to the plate-like elastic member. 3. The dynamic vibration absorbing device according to claim 1, wherein the plate-shaped elastic member is formed in a disk shape, and one end of the mounting member is fixed to substantially the center of the plate-shaped elastic member. 4. The pair of plate-shaped elastic members are sandwiched by plate members that adjust the cycle of vibrations to be absorbed.
The dynamic vibration absorbing device according to any one of 1.