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Article: Sound absorption of a micro-perforated panel backed by an irregular-shaped cavity

TitleSound absorption of a micro-perforated panel backed by an irregular-shaped cavity
Authors
Issue Date2010
PublisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.html
Citation
Journal of the Acoustical Society of America, 2010, v. 127 n. 1, p. 238-246 How to Cite?
AbstractIn the pursuit of more effective noise control devices, the cavity backed micro-perforated panel absorber (CBMPPA) is developed in this study. A CBMPPA differs from the conventional micro-perforated panel (MPP) absorber in that the MPP is backed by a trapezoidal cavity, which allows more effective vibroacoustic coupling between the MPP and the cavity. A two-dimensional theoretical model is established and tested both numerically and experimentally. Based on the verified theoretical model, sound absorption performance of a trapezoidal CBMPPA is investigated numerically. Results show that the shape of the backing cavity can significantly alter the sound absorption mechanisms and frequency distribution of overall sound absorption coefficient of the absorber. Further analyses show that acoustic modes that are initially decoupled from the MPP in the rectangular configuration are coupled with the air motion in the MPP, which accounts for the change in absorption pattern of the trapezoidal CBMPPA. By the same token, it also provides the flexibility for tuning the effective absorption range of the absorber. Due to the varying impedance matching conditions, the absorption performance of the trapezoidal CBMPPA exhibits obvious local characteristics over the MPP surface, which contrasts with the spatially uniform absorption in the conventional MPP absorber.
Persistent Identifierhttp://hdl.handle.net/10722/224776
ISSN
2015 Impact Factor: 1.572
2015 SCImago Journal Rankings: 0.938

 

DC FieldValueLanguage
dc.contributor.authorWang, C-
dc.contributor.authorCheng, L-
dc.contributor.authorPan, J-
dc.contributor.authorYu, G-
dc.date.accessioned2016-04-14T08:28:44Z-
dc.date.available2016-04-14T08:28:44Z-
dc.date.issued2010-
dc.identifier.citationJournal of the Acoustical Society of America, 2010, v. 127 n. 1, p. 238-246-
dc.identifier.issn0001-4966-
dc.identifier.urihttp://hdl.handle.net/10722/224776-
dc.description.abstractIn the pursuit of more effective noise control devices, the cavity backed micro-perforated panel absorber (CBMPPA) is developed in this study. A CBMPPA differs from the conventional micro-perforated panel (MPP) absorber in that the MPP is backed by a trapezoidal cavity, which allows more effective vibroacoustic coupling between the MPP and the cavity. A two-dimensional theoretical model is established and tested both numerically and experimentally. Based on the verified theoretical model, sound absorption performance of a trapezoidal CBMPPA is investigated numerically. Results show that the shape of the backing cavity can significantly alter the sound absorption mechanisms and frequency distribution of overall sound absorption coefficient of the absorber. Further analyses show that acoustic modes that are initially decoupled from the MPP in the rectangular configuration are coupled with the air motion in the MPP, which accounts for the change in absorption pattern of the trapezoidal CBMPPA. By the same token, it also provides the flexibility for tuning the effective absorption range of the absorber. Due to the varying impedance matching conditions, the absorption performance of the trapezoidal CBMPPA exhibits obvious local characteristics over the MPP surface, which contrasts with the spatially uniform absorption in the conventional MPP absorber.-
dc.languageeng-
dc.publisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.html-
dc.relation.ispartofJournal of the Acoustical Society of America-
dc.rightsJournal of the Acoustical Society of America. Copyright © Acoustical Society of America.-
dc.rightsAfter publication by ASA : Copyright (year) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. along with the following message: The following article appeared in (citation of published article) and may be found at (URL/link for published article abstract). Prior to publication by ASA, the notice should state: The following article has been submitted to/accepted by [Name of Journal]. After it is published, it will be found at (URL/link to the entry page of the journal. For JASA: http://scitation.aip.org/JASA; for JASA Express Letters: http://scitation.aip.org/JASA-EL; for Proceedings of Meetings on Acoustics: http://scitation.aip.org/POMA.-
dc.titleSound absorption of a micro-perforated panel backed by an irregular-shaped cavity-
dc.typeArticle-
dc.identifier.emailWang, C: chunqiwang@yahoo.com.cn-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1121/1.3257590-
dc.identifier.pmid20058969-
dc.identifier.hkuros180488-
dc.identifier.volume127-
dc.identifier.issue1-
dc.identifier.spage238-
dc.identifier.epage246-
dc.publisher.placeUnited States-

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