JP2009127827A - Viscoelastic damper using friction damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a viscoelastic damper for effectively damping vibration when its amplitude is smaller and even when greater. <P>SOLUTION: The viscoelastic damper 1 is provided for giving shearing deformation to a viscoelastic layer 4 with vibration to absorb vibration energy. It comprises a combination of friction dampers 5, 6. The friction dampers 5, 6 have friction operation in linkage with the shearing deformation operation of the viscoelastic layer 4 to absorb vibration energy. Their friction force is smaller as a distance from an original point position is longer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a viscoelastic damper using a friction damper.

2. Description of the Related Art Various types of damping means used in buildings and the like using a viscoelastic damper made to absorb vibration energy by causing a viscoelastic body to undergo shear deformation by vibration have been provided.
JP 2006-152788 A JP 2006-283374 A

  However, the viscoelastic damper can obtain a large damping force during a large vibration with a large amplitude, but has a characteristic that only a small damping force can be obtained during a small vibration with a small amplitude because the history of the load-deformation relationship is small. Therefore, if it is configured so that a large damping force can be obtained at the time of a small vibration with a small amplitude, the damping force at the time of a large vibration with a large amplitude becomes too large, which causes damage and destruction of peripheral members. There is a problem.

  In view of the above-mentioned problems, the present invention can effectively attenuate the vibration at the time of a small vibration with a small amplitude, but can also effectively attenuate the vibration at the time of a large vibration with a large amplitude. An object is to provide a viscoelastic damper.

In the viscoelastic damper made to absorb vibration energy by causing the viscoelastic body to undergo shear deformation by vibration,
Friction damper is combined,
The friction damper absorbs vibration energy by performing a friction operation in conjunction with the shear deformation operation of the viscoelastic body, and the friction force decreases as the distance from the origin position increases. This is solved by a viscoelastic damper using a friction damper, characterized in that it is configured as follows.

  In this damper, the damping force that is insufficient only by shear deformation of the viscoelastic body during small vibrations with small amplitude is increased by the frictional force of the friction damper, and that vibration is effectively damped during small vibrations with small amplitude. Can do.

  In addition, it is not necessary to configure the viscoelastic body so that a large damping force can be obtained at the time of a small vibration with a small amplitude, and the frictional force due to the friction damper is reduced at the time of a large vibration with a large amplitude. The vibration can be effectively damped even during a large vibration with a large amplitude.

  Since the viscoelastic damper according to the present invention is as described above, the vibration can be effectively damped at the time of a small vibration with a small amplitude, but the vibration is effectively also at the time of a large vibration with a large amplitude. Can be attenuated.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  In the viscoelastic damper 1 according to the first embodiment shown in FIGS. 1 and 2, 2 is an upper plate, 3 and 3 are lower plates, the upper plate 2 is disposed between the lower plates 3 and 3, and the plate When the upper and lower plates 2 and 3 and 3 are displaced in the left-right direction by vibration such as an earthquake, the viscoelastic layer 4 and 4 are subjected to shear deformation to absorb vibration energy and attenuate vibration.

  The viscoelastic damper 1 is combined with a friction damper. That is, in the overlapping portion between the upper and lower plates 2 and 3, the friction materials 5 and 5 are attached to the central portion in the left and right direction on the lower plate 3 side on both the upper and lower sides sandwiching the viscoelastic body layer 4, and the upper plate Friction surfaces 6, 6 extending in the left-right direction are provided on the side 2, and when the upper plate 2 and the lower plates 3, 3 are displaced relative to each other in the left-right direction by vibration, The surface 6 is rubbed to perform a frictional operation, and absorbs vibration energy.

  In this friction damper, in this embodiment, as shown in FIG. 1 (c), the friction surface 6 has a central portion 6a or an intermediate portion in the left-right direction formed as a friction surface having a large friction coefficient. Both side portions 6b and 6b sandwiching the central portion 6a are formed on a friction surface having a smaller friction coefficient, so that the frictional force decreases as the distance from the origin position increases.

  With such a configuration, as shown in FIGS. 2 (A-1) and (A-2), at the time of a small vibration with a small amplitude, a damping force that is insufficient only due to the shear deformation of the viscoelastic body layers 4 and 4 is reduced. As shown in FIGS. 2 (B-1) and (B-2), the frictional force generated by the frictional damper mechanism units 5 and 6 is increased during a large vibration with a large amplitude, as shown in FIGS. It becomes small and it is prevented that the damping force by the viscoelastic body layers 4 and 4 and the friction damper mechanism parts 5 and 6 becomes excessive, and thereby the vibration is effectively damped at the time of a small vibration with a small amplitude. In addition, the vibration can be effectively damped even during a large vibration with a large amplitude.

  In the viscoelastic damper 1 using the friction damper according to the second embodiment shown in FIG. 3, the friction coefficient of the friction surface 6 is constant in the left-right direction, but as shown in FIG. 6c or both side portions 6d and 6d sandwiching the intermediate portion are inclined so as to weaken the pressing force with the friction material 5, and as the distance from the origin position increases accordingly. The configuration is such that the frictional force is small, and the others are the same as in the first embodiment.

  Also in this case, at the time of a small vibration with a small amplitude, the damping force that is insufficient only by the shear deformation of the viscoelastic layers 4 and 4 is increased by the frictional force by the friction damper mechanisms 5 and 6, and the large amplitude with a large amplitude. At the time of vibration, the frictional force by the friction damper mechanism parts 5 and 6 is reduced, and the damping force by the viscoelastic body layers 4 and 4 and the friction damper mechanism parts 5 and 6 is prevented from being excessive, and the amplitude is small. The vibration can be effectively attenuated when the vibration is small, and the vibration can be effectively attenuated even when the vibration is large and has a large amplitude.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, a case where a friction damper mechanism portion composed of the friction material 5 having a specific structure and the friction surface 6 is adopted and combined with the viscoelastic damper 1 having the specific structure is shown. However, the friction damper, in essence, is designed to absorb frictional energy by performing frictional motion in conjunction with the shear deformation motion of the viscoelastic body, and as the distance from the origin position increases. As long as the frictional force is configured to be small, friction dampers of various structural forms may be adopted, and there is no restriction on the structural form of the viscoelastic damper to be applied, and it is not incorporated into the viscoelastic damper. A combined structure may also be used.

FIG. 1 shows a viscoelastic damper using a friction damper according to a first embodiment, in which FIG. (A) is a side view, FIG. (B) is a front view, and FIG. (C) is a front view of an upper plate. FIGS. (A-1), (I-2), (B-1), and (B-2) are explanatory views showing the operating state of the viscoelastic damper. FIG. 2 shows a viscoelastic damper using a friction damper according to a second embodiment, in which FIG. (A) is a side view, FIG. (B) is a front view, FIG. (C) is a front view of an upper plate, and FIG. It is II sectional view taken on the line of figure (C).

Explanation of symbols

1 ... Viscoelastic damper using friction damper 4 ... Viscoelastic layer (Viscoelastic body)
5. Friction material (friction damper mechanism)
6. Friction surface (friction damper mechanism)

Claims (1)

In a viscoelastic damper made to absorb vibration energy by causing shear deformation of the viscoelastic body by vibration,
Friction damper is combined,
The friction damper absorbs vibration energy by performing a friction operation in conjunction with the shear deformation operation of the viscoelastic body, and the friction force decreases as the distance from the origin position increases. A viscoelastic damper using a friction damper, characterized in that it is configured as follows.

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