Study on damping performance for granular damper using fine particles

The granular damper enables damping of vibration by enclosing a plurality of particles in the structure. The vibration damping principle of the granular damper is the dissipation of energy due to friction between particles. Since this damper is easy to install, it has been applied research as a vibration control structure for various machines. In order to ensure vibration damping performance and perform design, it is necessary to predict the frictional force between particles and the collision force with a container by simulation. The purpose of this research is to propose the evaluation method of the vibration damping performance of the granular damper and the prediction method by the discretized element method using the fine particles with the basic particle diameter of 100 m or less. As for the experimental method, various evaluations have been made possible by a simple test method in which fine particles are enclosed in a metal plate. With this test method, we succeeded in obtaining a good damping effect even with a granular damper with a particle size of 100 m or less, and finding the control factors necessary for design.