Abstract
This paper describes a method of controlling the noise emitted from opening of an enclosure by appropriately arranging absorbing materials. There are two steps in the method. First, the sound pressure and acoustic particle velocity in the enclosure are calculated by FDTD numerical simulation. Next, we examine the arrangement of the acoustic absorbing materials to decrease the acoustic power of the emitted sound from the opening based on the numerical results. Numerical results show that it is necessary to design absorber locations when the acoustic absorbing materials with small volume in the enclosure are used.
