Abstract
We have to avoid the noise of the vehicle to be better safety and comforts. Therefore we often use structures which have a porous material sandwiched between a cover plate and a base plate. We deal with vibration properties of this structures using FEM and MSKE method proposed by Yamaguchi. In this report, we find out the characteristics of vibration transmission from the flat base plate to the cover plate which have inclination. We compute the responses excited not only at a point on the surface of the base plate but also all points on the surface of the base plate. When the cover plate have inclination, the porous material has the thin part and the thick part. In the thin part, the vibration transmission from the flat base plate to the cover plate is large. And in the thick part, elasticity of internal air at is lower and the vibration transmission amount is a little. When the base plate is excited from all the points on the surface, influences the thin part is large. Therefore the vibration transmission increases from the flat base plate to the cover plate which have inclination.
