抄録
This study is concerned with active control of sound in a cavity using power mode theory. First, orthogonal contributions in terms of error criterion, the acoustic potential energy in a cavity, are derived for attenuation of sound. The orthogonal contributions here are referred to as "power modes". The power modes have eigenvalues and eigenvector. Both of the numerical simulation and an experiment are operated to support the validity of power mode theory. A rigid walled rectangular cavity with one flexible rectangular panel is used as a model. Through an experimental investigation practical implementation of this technique are examined and discussed.
