Numerical simulation of vibroacoustic damping by granular materials

Recently, many efforts related to vibration reduction of plate vibration using granular materials can be seen. In this paper, a simulation method of the damping effect of bending vibration of the plate by granular material combining following two kinds of methods was proposed. One is the discrete element method (DEM) which simulate the motion of the granular material. The other is the finite-difference time-domain (FDTD) method which simulate the vibration of the thin plate. By using this coupling method, influence of the granular material on the plate vibration was investigated. Validity of the proposed method was confirmed by comparison between the results of the calculation and the model experiment.