Abstract
In this paper, an optimality condition for a sound pressure minimization in an enclosure is considered. The sound pressure in a frequency domain is expressed in scalar product of a structural frequency response function (FRF) and an acoustic FRF. Therefore, the optimality condition is that the sound pressure is zero when structural and acoustic FRF are orthogonal or zero. And to reduce the sound pressure, it is needed to reduce amplitude of the structural and acoustic FRF or a cosine between them. From this viewpoint, a contour plot which shows optimal state of the sound pressure minimization is introduced. And a novel optimization approach based on the optimality condition is proposed.
