Acoustic performance of microperforated panel absorber array subjected to high intensity sound

Microperforated panel (MPP) absorber is a promising fiber-free alternative to the porous materials. It is widely applied in the air-conditioning systems and aircraft engines which are the environments with high sound pressure. The present study focuses on the acoustic properties of the parallel arranged MPP absorber array at high incident sound intensity. A different impedance model instead of the traditional linear impedance model is required such that the effects of jets and vortex rings formed at the exit of orifices on the acoustic properties are taken into account. The absorption performance are investigated by adopting the empirical acoustic impedance model, in which the excitation pressure is considered. The MPP absorber array with different designed geometric parameters are studied. The preliminary results show that a broader frequency range is obtained by the MPP absorber array by comparing with a single MPP absorber. Also, a better acoustic absorption performance is achieved at high sound intensity. Experimental studies are conducted to verify the empirical model for the array of MPP absorber. The prototype is tested under normal incident. The estimated and measured results show good agreement.