Study on Vibration Reduction System with Granular Materials

(Study of the damping mechanism based on the vibration energy)

Abstract

We have studied the damping mechanism of a granular material damping system applied to reducing vibration in structures that have a high natural frequency and small vibration displacement. In this report, we considered the damping mechanism based on the vibration energy. We calculated the movement of the all granular materials and the container, the work by the collision, and the work by the friction. We compared them to container displacement. As a result, we obtained the conclusion as follows. The work by the collision between the granular materials and the container has a big influence on the damping mechanism when the total mass of granular material is small. On the other hand the influence of the work by the friction is increased in accordance with increase of the total mass of granular material.