Acoustic performance of a plate with varying perforations

摘要

A theoretical study of a plate with varying perforations is presented in this paper. The Bloch wave theory and the transfer matrix method are used to investigate the acoustic performance of the plate. It is found that different from the original attenuation characteristic of the plate with periodic perforations that brought about by structural periodicity, the varying perforations provides a unique structure performance. All of the results predicted by the theory fit well with a numerical simulation using a finite element method. As a result, the proposed structure may have a potential application in duct noise control under careful parameter design.