Impact damper with granular materials applied to self-induced vibration

摘要

A simple yet efficient shot impact damper consists of a bed of granular materials in a container mounted on a primary vibrating system. We have studied the performance of the shot impact damper which is applied to some kinds of vibrating systems subjected to harmonic excitations. This study clarifies the damping performance of the damper when applied to the self-induced vibration system with bilinear characteristics of friction force. The periodic motion of the self-excited vibration accompanied by the impact of the damper mass is determined by theoretical analysis as well as numerical simulation studies which utilize the Willson-θ method. The damping performances are obtained in terms of the damper parameters and self-excitations. The results show that heavier damper mass provides greater damping effect on the fully built-up vibrations, and that a lighter mass is effective at the onset of the vibration. Finally, we determined the optimum clearances under which the response amplitudes are reduced to a minimum for suppressing the vibrations.