EFFECTS OF THE PANEL AND HELMHOLTZ RESONANCES ON A MICRO-PERFORATED ABSORBER

In this study, the absorption of an absorber, which considers the three effects, microperforation, panel resonance and Helmholtz resonator, is investigated. The theory developed for the micro-perforated absorber is based on that the impedances of the three effects are in parallel and connected to that of the air cavity in series. In previous studies, these three effects were not considered simultaneously for acoustic absorber. It can be concluded from the theoretical and experimental results that the panel and Helmholtz resonances can enhance the absorption bandwidth of a micro-perforated absorber.