Cavity-backed microperforated panel sound absorbers

Chunqi Wang, Li Cheng, Jie Pan

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The sound absorption and the surface impedance of a micro-perforated panel (MPP) backed by a trapezoid acoustic cavity with varying depth are numerically investigated. The coupled acoustic problem between the MPP and the acoustic cavity is formulated using a modal expansion method, which allows the determination of the acoustic pressure and velocity over the MPP surface. The validity of the solution is examined by comparing the predicted sound absorption curves with existing results provided by literature in a special case where a commonly used MPP absorber is involved. Numerical results based on the verified model reveal that, around the first cavity resonance, the irregular-shaped MPP absorber demonstrates similar sound absorption characteristics as that of a regular one having the same depth. However, the irregular-shaped MPP absorber can achieve a good/moderate sound absorption level in between the first and second resonances, as opposed to conventional MPP absorbers with constant cavity depth for which the sound absorption is usually negligible. Further investigation shows that this phenomenon is caused by the local resonances occurring in the irregular-shaped cavity. This phenomenon can be further explored for improving the acoustic performance of MPP absorbers.
Original languageEnglish
Title of host publication38th International Congress and Exposition on Noise Control Engineering 2009, INTER-NOISE 2009
Pages1004-1012
Number of pages9
Volume2
Publication statusPublished - 1 Dec 2009
Event38th International Congress and Exposition on Noise Control Engineering 2009, INTER-NOISE 2009 - Ottawa, ON, Canada
Duration: 23 Aug 200926 Aug 2009

Conference

Conference38th International Congress and Exposition on Noise Control Engineering 2009, INTER-NOISE 2009
CountryCanada
CityOttawa, ON
Period23/08/0926/08/09

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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