JP4866493B2 - Composite damper - Google Patents

Description

  The present invention relates to a composite damper.

  Viscoelastic dampers are speed dependent and have a good balance in the load-bearing relationship with the housing, and have the advantage of less fatigue against repeated loads. It also has the disadvantage that its performance is highly dependent and its performance value is likely to vary depending on the environment.

  On the other hand, hysteretic friction dampers have the advantage of being able to obtain a stable history with low dependency, but on the other hand, they are prone to fatigue against repeated loads and are rigid elements. Therefore, there is a drawback that the response acceleration may be increased.

A composite damper that combines a viscoelastic damper and a friction damper with the above-mentioned advantages and disadvantages, attenuates small vibrations with a viscoelastic damper, and attenuates large vibrations with a friction damper. More are offered.
JP 2006-257664 A

  However, the composite damper as described above has a structure in which a small vibration is attenuated by a viscoelastic damper and a large vibration is attenuated by a friction damper. In relation to the above advantages and disadvantages, It does not form a relationship that compensates for one drawback.

  In the background as described above, the present invention can improve the balance in the load bearing relationship with the housing, reduce fatigue due to repeated loads, and depend on temperature and frequency. It is an object of the present invention to provide a composite damper capable of suppressing the variation in performance value due to the environment while suppressing the property.

The above problem is that the viscoelastic body damper portion absorbs vibration energy by shear deformation of the viscoelastic body due to the relative displacement of the first member and the second member,
A friction damper that absorbs vibration energy by sliding due to relative displacement of the first and second members,
By the relative displacement of the first and second members, absorption of vibration energy due to shear deformation of the viscoelastic body in the viscoelastic damper portion and absorption of vibration energy due to slip in the friction damper portion are performed simultaneously. It is solved by the composite damper characterized by having (1st invention).

  In this composite damper, absorption of vibration energy due to shear deformation of the viscoelastic body in the viscoelastic damper portion and absorption of vibration energy due to slip in the friction damper portion are performed simultaneously by relative displacement of the first and second members. It is made to be. Therefore, by absorbing a part of vibration energy by the friction damper part, the friction damper part compensates for the variation in the performance value due to the environment due to the dependence on temperature and frequency, which is a drawback of the viscoelastic damper, By absorbing a part of the vibration energy by the viscoelastic damper part, the frictional force in the friction damper part can be reduced, and the response acceleration that tends to be high, which is a drawback of the friction damper, and fatigue against repeated loads Is compensated by the viscoelastic damper, which makes it possible to achieve a good balance in the load bearing relationship with the housing, to reduce fatigue due to repeated loads, and to the temperature and frequency It is possible to suppress the dependence of the performance value due to the environment by suppressing the dependency.

  In the first invention, a friction force adjusting mechanism for adjusting a friction force in the friction damper portion may be provided (second invention). In this case, the relative amount of energy absorption due to viscoelasticity and energy absorption due to friction is adjusted by increasing or decreasing the frictional force in the friction damper by the frictional force adjusting mechanism. As a result, the performance of the viscoelastic damper can be pulled out more or the performance of the friction damper can be pulled out more, and the composite damper can have the desired performance. it can. In particular, since a friction damper is employed as the hysteresis damper, it can be realized only by providing a simple friction force adjusting mechanism.

In the second invention, the first member includes a pair of flanges and a web connecting the flanges, and the second member is disposed along the web between the pair of flanges of the first member. A viscoelastic body is interposed between the two members to form a viscoelastic body damper portion,
A screw mechanism as a frictional force adjusting mechanism is passed to a pair of flanges of the first member at a position eccentric to the side from the web, and a friction damper portion is formed by sandwiching the second member between the pair of flanges by the screw mechanism. (3rd invention).

  In this case, a first member having a pair of flanges and a web connecting these flanges is employed, and a viscoelastic body damper portion is interposed between the web and the second member. Since the friction damper portion is formed by sandwiching the second member between the pair of flanges with a screw mechanism, the first and second composite dampers can be configured with a simple structure with a small number of component types. it can.

  Since the composite damper of the present invention is as described above, the load balance with the housing can be improved in balance, and fatigue due to repeated loads can be reduced. It is possible to suppress the variation in performance value due to the environment by suppressing the dependency on the frequency.

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

  In the composite damper of the embodiment shown in FIG. 1, 2 is a first member, 3 is a second member, and the first member 2 includes a pair of flanges 2a and 2a and a web 2b connecting the flanges 2a and 2a. The second member 3 is composed of a pair of rectangular plates 3 a and 3 a and a joint material 3 b, and each of the plates 3 a and 3 a is formed of the first member 2. Between the upper and lower flanges 2a and 2a, both sides of the web 2b are provided so that the plate surface faces the surface of the web 2b, and one end side of the first member 2 is one end side of the plates 3a and 3a. The other end side of the plates 3a, 3a protrudes outward from the other end side of the first member 2, and a joint material 3b is interposed between the plates 3a, 3a on the other end side. 3a, 3a and the joint material 3b It is embodied, and the first member 2 and the second member 3 are made to be able to perform relative displacement in the longitudinal direction of the first member 2.

  The viscoelastic bodies 4 and 4 are interposed between the web 2b of the first member 2 and the plates 3a and 3a of the second member 3 to form the viscoelastic body damper portions 5 and 5, and the first member 2 and the second member 3 are subjected to relative displacement in the length direction of the first member 2 by vibration as shown in FIG. It is designed to absorb energy.

  Further, the width dimension of each plate 3a, 3a of the second member 3 is designed such that these plates 3a, 3a are close to or in contact with the pair of flanges 2a, 2a of the first member 2. The facing surface portions are formed on a sliding surface (not shown) made of PTFE or the like. The pair of flanges 2a, 2a of the first member 2 is provided with bolts 6 at positions offset from the web 2b laterally and outside the plates 3a, 3a of the second member 3. Then, the bolt 6 is tightened and the pair of flanges 2a, 2a are put between the plates 3a, 3a, whereby the friction damper portions 7 are formed, and the first member 2, the second member 3, However, when relative displacement is performed in the length direction of the first member 2 by vibration, shear deformation of the viscoelastic bodies 4 and 4 and the pair of the plates 3a and 3a are paired as shown in FIGS. The friction with the flanges 2a and 2a is performed at the same time, and the vibration energy is absorbed by the friction damper portion 7 and the viscoelastic damper portion 5.

  The bolts 6 are arranged in a plurality of rows at predetermined intervals in the length direction of the first member 2 on both sides of the web 2b of the first member 2, and the tightening degree of each bolt 6 is adjusted. Thus, the frictional force in each friction damper portion 7 can be adjusted. These bolts 6 ... constitute a screw mechanism as a frictional force adjusting mechanism.

  In the composite damper 1 described above, when the first member 2 and the second member 3 are relatively displaced in the length direction of the first member 2 by vibration, shear deformation of the viscoelastic bodies 4 and 4 is caused. Since the friction between the plates 3a and 3a and the pair of flanges 2a and 2a is performed at the same time, the vibration energy is absorbed by the friction damper portion 7 and the viscoelastic damper portion 5. The friction damper portion 7 compensates for the variation in performance value due to the environment depending on the temperature and frequency, which is a drawback of the viscoelastic damper, by absorbing a part of the vibration energy by the friction damper portion 7, The viscoelastic body damper part 5 absorbs a part of the vibration energy, so that the frictional force in the friction damper part 7 can be reduced, and the response acceleration and repetitiveness, which are the drawbacks of the friction damper, are easily increased. The viscoelastic damper 5 compensates for fatigue against the load, which can improve the balance in the load bearing relationship with the housing, reduce the fatigue against repeated loads, and And variations in performance values due to the environment can be suppressed by suppressing the dependence on frequency.

  Since the bolts 6 can adjust the frictional force in the friction damper portions 7 to be increased or decreased by the bolts 6... The relative amount of energy absorption can be adjusted, so that the performance of the viscoelastic damper can be pulled out more or the performance of the friction damper can be pulled out more. The composite damper can have a desired performance. In particular, by adopting a friction damper as the hysteresis damper, it can be realized only by providing a simple friction force adjusting mechanism using bolts 6.

  In the present embodiment, an H-shaped steel including a pair of flanges 2a and 2a and a web 2b connecting the flanges 2a and 2a is adopted as the first member, and the web 2b and the plate 3a of the second member 3 are used. , 3a, viscoelastic bodies 4 and 4 are interposed to form a viscoelastic body damper portion 5, and plates 6a, 3a are sandwiched between the flanges 2a, 2a by bolts 6 ... Since the structure is formed, the composite damper can be configured with a simple structure with a small number of component types.

  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 third invention, the specific form of the second member is not limited, and in the first and second inventions, the specific form of the first member and the second member is not limited. If absorption of vibration energy due to shear deformation of the viscoelastic body in the viscoelastic damper portion and absorption of vibration energy due to slip in the friction damper portion are performed simultaneously by relative displacement of the second member Good. The relative displacement of the first and second members is not limited to linear relative displacement, and may be relative displacement in the rotational direction.

1 shows a composite damper according to an embodiment, in which FIG. (A) is a front view, FIG. (B) is a cross-sectional view taken along the line II of FIG. (A), and FIG. (C) is II-II of FIG. FIG. The operation state of the composite damper is shown, in which FIG. (A) is a sectional plan view and (b) is a front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Composite damper 2 ... 1st member 2a ... Flange 2b ... Web 3 ... 2nd member 3a ... Plate 4 ... Viscoelastic body 5 ... Viscoelastic body damper part 6 ... Bolt (screw mechanism, frictional force adjustment mechanism)
7. Friction damper part

Claims (1)

A second member is disposed along the web between the pair of flanges of the first member comprising a pair of flanges and a web connecting the flanges;
  While a viscoelastic body is interposed between the web and the second member to form a viscoelastic damper portion,
  Friction damper that adjusts the frictional force by passing a screw mechanism between the pair of flanges in a position eccentric to the side from the web and allowing the second member to be sandwiched between the pair of flanges by the screw mechanism Part is formed,
  By causing the first member and the second member to be relatively displaced in a direction along the web and perpendicular to a direction connecting the pair of flanges, the viscoelastic body in the viscoelastic damper portion A composite damper characterized in that absorption of vibration energy due to shear deformation and absorption of vibration energy due to sliding between a pair of flanges and a second member in the friction damper portion are performed simultaneously.

Images