Distribution and Influence of Optimal Structural Parameters to Low-frequency Sound Absorption Property of the Microperforated Panel Absorber

Abstract

Noise pollution is a global problem, no matter in developed or developing countries, which makes the noise reduction one research focus all over the world. microperforated panel (MPP) absorber is supposed as a potential and practical candidate for effective noise reduction, particularly in the urban area. Influence of the optimal structural parameters to low-frequency sound absorption performance of the MPP absorber are studied in this research. The theoretical sound absorption model provides the foundation for the further analysis, and the cuckoo search algorithm is treated as the technique support. Influences of the optimal structural parameters for thin/normal/thick MPP absorbers are studied by the combination of theoretical modeling and cuckoo search optimization with the total thickness of the MPP absorber ranging from 10 mm to 60 mm with the interval of 10 mm, from which it can be concluded that the major influent factor is total thickness of the MPP absorber. For a given total thickness of the MPP absorber, no matter what thickness of the panel is, it can always achieve appropriate structural parameters by optimization to obtain similar best sound absorption performance, which will be favorable to design and develop practical MPP absorbers.