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Article: Oblique incidence sound absorption of parallel arrangement of multiple micro-perforated panel absorbers in a periodic pattern

TitleOblique incidence sound absorption of parallel arrangement of multiple micro-perforated panel absorbers in a periodic pattern
Authors
Issue Date2014
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jsvi
Citation
Journal of Sound and Vibration, 2014, v. 333 n. 25, p. 6828-6842 How to Cite?
AbstractThe sound absorption performance of a micro-perforated panel (MPP) absorber array at oblique incidence and in diffuse field is investigated both numerically and experimentally. The basic module of the MPP absorber array consists of four parallel-arranged MPP absorbers with different cavity depths, and the whole MPP absorber array is created by arranging the basic modules in a periodically repeating pattern. Results show that the influence of incidence angle mainly lies in two aspects. First, the parallel absorption mechanism breaks down at lower frequencies at oblique incidence than at normal incidence due to the non-compactness of the resonating MPP absorber, which becomes non-compact if the time delay of incident wave across it is comparable to or larger than π/2. Second, the equivalent acoustic impedance of the MPP varies with respect to incidence angle which in turn changes the sound absorption performance of the MPP absorber array. Influence of the azimuthal angle is insignificant. Because of mutual influence among the member MPP absorbers, the normal incidence sound absorption of the MPP absorber array can be noticeably different from that of the basic module tested in impedance tube. The measured sound absorption coefficients of a prototype specimen in reverberation room compare well with the numerical predictions. The extra sound absorption due to diffraction of sound at the free edges of test specimen is the most efficient around 500 Hz.
Persistent Identifierhttp://hdl.handle.net/10722/203032
ISSN
2015 Impact Factor: 2.107
2015 SCImago Journal Rankings: 1.494

 

DC FieldValueLanguage
dc.contributor.authorWang, C-
dc.contributor.authorHuang, L-
dc.contributor.authorZhang, Y-
dc.date.accessioned2014-09-19T11:08:13Z-
dc.date.available2014-09-19T11:08:13Z-
dc.date.issued2014-
dc.identifier.citationJournal of Sound and Vibration, 2014, v. 333 n. 25, p. 6828-6842-
dc.identifier.issn0022-460X-
dc.identifier.urihttp://hdl.handle.net/10722/203032-
dc.description.abstractThe sound absorption performance of a micro-perforated panel (MPP) absorber array at oblique incidence and in diffuse field is investigated both numerically and experimentally. The basic module of the MPP absorber array consists of four parallel-arranged MPP absorbers with different cavity depths, and the whole MPP absorber array is created by arranging the basic modules in a periodically repeating pattern. Results show that the influence of incidence angle mainly lies in two aspects. First, the parallel absorption mechanism breaks down at lower frequencies at oblique incidence than at normal incidence due to the non-compactness of the resonating MPP absorber, which becomes non-compact if the time delay of incident wave across it is comparable to or larger than π/2. Second, the equivalent acoustic impedance of the MPP varies with respect to incidence angle which in turn changes the sound absorption performance of the MPP absorber array. Influence of the azimuthal angle is insignificant. Because of mutual influence among the member MPP absorbers, the normal incidence sound absorption of the MPP absorber array can be noticeably different from that of the basic module tested in impedance tube. The measured sound absorption coefficients of a prototype specimen in reverberation room compare well with the numerical predictions. The extra sound absorption due to diffraction of sound at the free edges of test specimen is the most efficient around 500 Hz.-
dc.languageeng-
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jsvi-
dc.relation.ispartofJournal of Sound and Vibration-
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Sound and Vibration. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Sound and Vibration, 2014, v. 333 n. 25, p. 6828-6842. DOI: 10.1016/j.jsv.2014.08.009-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleOblique incidence sound absorption of parallel arrangement of multiple micro-perforated panel absorbers in a periodic pattern-
dc.typeArticle-
dc.identifier.emailWang, C: cqwang@hku.hk-
dc.identifier.emailHuang, L: lixi@hku.hk-
dc.identifier.emailZhang, Y: yumin@hku.hk-
dc.identifier.authorityHuang, L=rp00119en_US
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.jsv.2014.08.009-
dc.identifier.hkuros239520-
dc.identifier.volume333-
dc.identifier.issue25-
dc.identifier.spage6828-
dc.identifier.epage6842-
dc.publisher.placeUnited Kingdom-

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