開口部を有する空洞内の吸音材適正配置による放射音抑制

抄録

This paper describes a method of controlling the noise emitted from the 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 possible to effectively suppress noise by arrangement of the acoustic absorbing material at the position of the particle velocity with largest amplitude. Experimental results also show the same tendency. It is necessary to design absorber locations when the acoustic absorbing materials with smaller volume in the enclosure are used.