Abstract
This study presents the generation of a quiet space in a rectangular cavity based on active wave control,demonstrating the validity of the proposed method from an experimental point of view.Firstly,a wave solution of a rectangular cavity is derived.This is followed by the derivation of wave filtering equation which is used for constructing wave filters.It is found from the equation that the wave filter mainly consists of modal filters and wave decomposition filters.Then,the limitation of the past method is pointed out,the improved methodology of the filter implementation presented.In the proposed method,the wave decomposition is conduction only in the frequency range slightly higher than a cut-on frequency.In the frequency range where the wave decomposition is not conducted,the average of the sound pressure is suppressed.Such methodology leads to the global noise suppression in the target space since progressive waves do not propagates under the cut-on frequency.Finally,experiment on the generation of a quiet space using the proposed wave filters is carried out,demonstrating that a quiet space is realized by the proposed method.
