Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43824
Title: Sound absorption of microperforated panels inside compact acoustic enclosures
Authors: Yang, C
Cheng, L 
Issue Date: 2016
Publisher: Academic Press
Source: Journal of sound and vibration, 2016, v. 360, 12646, p. 140-155 How to cite?
Journal: Journal of sound and vibration 
Abstract: This paper investigates the sound absorption effect of microperforated panels (MPPs) in small-scale enclosures, an effort stemming from the recent interests in using MPPs for noise control in compact mechanical systems. Two typical MPP backing cavity configurations (an empty backing cavity and a honeycomb backing structure) are studied. Although both configurations provide basically the same sound absorption curves from standard impedance tube measurements, their in situ sound absorption properties, when placed inside a small enclosure, are drastically different. This phenomenon is explained using a simple system model based on modal analyses. It is shown that the accurate prediction of the in situ sound absorption of the MPPs inside compact acoustic enclosures requires meticulous consideration of the configuration of the backing cavity and its coupling with the enclosure in front. The MPP structure should be treated as part of the entire system, rather than an absorption boundary characterized by the surface impedance, calculated or measured in simple acoustic environment. Considering the spatial matching between the acoustic fields across the MPP, the possibility of attenuating particular enclosure resonances by partially covering the enclosure wall with a properly designed MPP structure is also demonstrated.
URI: http://hdl.handle.net/10397/43824
ISSN: 0022-460X
EISSN: 1095-8568
DOI: 10.1016/j.jsv.2015.09.024
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