粒子法Non-smooth DEMを用いた数値解析と可視化実験による粒状体衝撃ダンパの制振メカニズム考察

抄録

This paper describes damping mechanisms of vibration reduction system with granular materials. A granular impact damper has a damping effect by enclosing particles in a container that also serves as the main vibrating part. In this paper, experiments were conducted with different diameters and quantities of particles, and image analysis of the particles inside was performed. The results show that the motion of the particles relative to the container affects the damping and that the damping ratio tends to increase with an increase in the number of particles when the particles are sufficiently small. In addition, a granular impact damper was modeled using a Non-Smooth DEM and numerically analyzed using the same parameters as in the experiment and compared with the experimental results. The results revealed important factors in the numerical analysis, their issues, and discussed a proposal to modify it.