Abstract
The paper describes acoustic characteristics by means of numerical analysis and measurement for the structures of absorptive material with elastic plate. Numerical analysis is carried out by finite difference time domain (FDTD) method. The update equations for the FDTD simulations in the sound filed with absorptive material and elastic plate modeled by the isotropy material are coupled at the boundary of both the mediums. We examine whether stiffness change of the elastic plate affects the transmission loss numerically and experimentally. It is found that acoustic characteristics of the absorptive material with elastic plate change depending upon the stiffness of the plate.
