Abstract
This study addresses validity of generating a vibration-free state in the designated area of a target plate for sound power reduction. The sound occurs from vibration on structure, hence, sufficient attenuation of acoustic power is assumed to be achieved by producing vibration-free state in the structure. In this study, the progressive wave control is employed to produce almost vibration-free state where some sound reduction can be expected. First, considering a simply supported, thin, lossless, steel rectangular plate, the solution of wave element is derived and sound power emitting from a target structure into free space in the case is defined. Next, the methodology of blocking the progressive wave is proposed. Then, finally, numerical simulation is conducted to confirm the produced quiet zone on the plate using the wave control method and to clarify the performance for suppression of the sound power.
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