Abstract
A breathable trim which compressed felt for light weighting has begun to be used by car. In this study, the panel was excited and assumed that the noise occurred in the compartment that was the closed space where a breathable trim was located. We made a simple model and calculated with an experiment. An acrylic pipe of 150mm in length and in 100mm in diameter was placed the parting strip that there was the hole. This was input the iron plate which it located in the base with a hammer. We measured a sound pressure level with the microphone which it was installed in an iron plate and the other side, made similar FE model and calculated. In addition, it was located the felt which assumed a trim in the hole minute of the parting strip. The felt used Miki model. The experimental results and the calculation results showed good agreement. Furthermore, this paper introduce a calculation result about the change of the sound pressure level when it changed flow resistivity of the felt.
