振動特性の温度依存性を抑制した粘弾性体動吸振器に関する研究

抄録

A viscoelastic material is sometimes applied to the damping element of a dynamic absorber. However, since the dynamic characteristics of a viscoelastic material are temperature dependent, it is considered that the vibration damping performance may deteriorate due to changes in the natural frequency and damping ratio. This paper proposes a structure for a dynamic absorber capable of suppressing the temperature-dependent change in vibratory characteristics. The dynamic absorber is a cantilever type which consists of two plate springs, and a viscoelastic material which is placed between these plate springs. The plate springs are bimetal which have the property of bending in response to temperature change. By means of this structure, the stiffness change of the viscoelastic material due to the temperature dependence is mitigated by the shape change of the viscoelastic material due to the bending of the bimetal. The validity of the proposed structure was confirmed theoretically and also in practice by a vibration test using a shaker.