Model and Optimization of Low-Frequency Sound Absorption Performance of Multilayer Microperforated Panel Absorber

Abstract

Optimization of the low-frequency sound absorption performance of the multilayer microperforated panel (MPP) absorber is favourable to promote its practical application in the noise reduction. Theoretical model of the multilayer MPP absorber was constructed based on the Maa’s theory for the further optimization. For target frequency range of 100-500Hz, parameters of the multilayer MPP absorbers with layer number of 1 to 4 were optimized through the cuckoo search algorithm according to the certain optimization objectives and the constraint conditions. Judging from the achieved optimal structural parameters for the multilayer MPP absorber with the target frequency ranges and the corresponding average sound absorption coefficients, it could be concluded that the parameter optimization was not only effective, but also be quite necessary. Meanwhile, it could be seen that average sound absorption coefficients of the optimal multilayer MPP absorbers decreased gradually along with increase of the layer number from 1 to 4. Through the optimization of structural parameters of the multilayer MPP absorbers, not only the sound absorption performance could be improved, but also the fabrication cost could be reduced. The research results exhibited outstanding low-frequency absorption performance, and it would be favourable to promote their practical applications to reduce the industrial noise in urban area.