衝突系に発生する低周波異常振動に関する研究

（動吸振器の効果に関する解析的検討）

抄録

The occurrence of the low frequency vibration in vibroimpact systems such as vibrating sieve reduces the reliability of the system and precludes normal operation when its amplitude is excessive. For suppressing the low frequency vibration, this paper analytically investigates the effect of a dynamic absorber on vibration characteristics. The system investigated comprises two masses which can move only in the vertical direction under gravity. The lower mass is supported by a spring and subjected to a periodic exciting force, whereas the upper mass bounces freely on the lower mass. The effect of the parameters of a dynamic absorber mounted on the lower mass is examined, showing that there is an optimal set of values for the natural frequency and the damping ratio to prevent the low frequency vibration.