調整機構を有する動吸振器の特性

抄録

One of effective ways to suppress vibration of a mechanical system is using a dynamic vibration absorber. The dynamic vibration absorber consists of a mass, a spring and a damper. The optimal tuning of natural frequency and damping ratio of the dynamic vibration absorber is required to suppress vibration. So, to add an adjustable mechanism of stiffness and damping of the dynamic vibration absorber becomes easy to tune. This paper proposes a new design method of an adjustable dynamic vibration absorber consisted of an adjustable mechanism of stiffness and damping. The adjustable mechanism of stiffness consisted of an arm, coil springs and a rotatable spring holder. Restoring force of coil springs was changed by rotating the spring holder. The adjustable mechanism of damping consisted of a copper plate, magnets and a linkage. Damping was changed by rotating the driving link. We made the proposed adjustable dynamic vibration absorber and verified whether the proposed adjustable mechanism is valid by experiments. In addition, we study the effect of mass of base, spring and damping in a dynamic vibration absorber on vibration control characteristics. We found the optimal tuning in consideration of that mass and confirmed the effect of the optimal tuning in consideration of that mass by experiment.