Abstract
The rammer is used in order to firm the ground. Then the vibration of its handle causes the poor circulation to the hand, and lead to the Raynaud's disease. We consider attaching the multi-particle collision damper in the rammer to attenuate the vibration of the handle. Vertical vibration and the torsional vibration are generated on the handle. Since the handle rotated by the movement of rammer, we focused to the torsional vibration. In this study, the characteristic of this damper to torsional vibration examined through experiments and simulation. A number of particles were put in the cylindrical vessel. In addition, the division plate was installed to colliding the particles. As a result, it turned out that the torsional vibration decreases if the particle of a suitable particle diameter and filling ration of particle for the vessel was filled.
