File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Broadband duct noise attenuation by a middle-ear mechanism

TitleBroadband duct noise attenuation by a middle-ear mechanism
Authors
KeywordsPhysics
Sound
Issue Date2008
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, 2008, v. 124 n. 4, p. 2516 How to Cite?
AbstractLow‐frequency duct noise is difficult to control passively by any device limited by its total volume due to system stiffness. When a side‐branch device is used cavity air becomes incompressible toward the dc frequency. One way to tackle the relative incompressibility for low to medium frequencies is to introduce acoustic phase difference in the cavity air oscillation which otherwise behaves like the low‐order room acoustics modes. The introduction of a light plate covering the cavity in our previous studies [J. Acoust. Soc. Am. 119 2628–2638 (2006)] does essentially that by enhancing the non‐volume‐displacing modes. Optimization shows that the required stiffness‐to‐mass ratio is much beyond what is available for existing bulk materials. In the present study an alternative device that resembles the ossicular structure of the mammalian middle ear is introduced. The acoustic signal is passed along through a rigid pin which simulates the ossicular bones via its longitudinal motion. Contrasting with the usual flexural waves in plate or membrane structures the bone transmission has almost infinite speed and it creates the phase difference needed to overcome the system stiffness. Theoretical predictions show that the performance of such device is comparable and better than the idealistic plate silencer with interesting comparisons of features. © 2008 Acoustical Society of America
Persistent Identifierhttp://hdl.handle.net/10722/62255
ISSN
2015 Impact Factor: 1.572
2015 SCImago Journal Rankings: 0.938

 

DC FieldValueLanguage
dc.contributor.authorHuang, Len_HK
dc.date.accessioned2010-07-13T03:57:17Z-
dc.date.available2010-07-13T03:57:17Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal of the Acoustical Society of America, 2008, v. 124 n. 4, p. 2516en_HK
dc.identifier.issn0001-4966en_HK
dc.identifier.urihttp://hdl.handle.net/10722/62255-
dc.description.abstractLow‐frequency duct noise is difficult to control passively by any device limited by its total volume due to system stiffness. When a side‐branch device is used cavity air becomes incompressible toward the dc frequency. One way to tackle the relative incompressibility for low to medium frequencies is to introduce acoustic phase difference in the cavity air oscillation which otherwise behaves like the low‐order room acoustics modes. The introduction of a light plate covering the cavity in our previous studies [J. Acoust. Soc. Am. 119 2628–2638 (2006)] does essentially that by enhancing the non‐volume‐displacing modes. Optimization shows that the required stiffness‐to‐mass ratio is much beyond what is available for existing bulk materials. In the present study an alternative device that resembles the ossicular structure of the mammalian middle ear is introduced. The acoustic signal is passed along through a rigid pin which simulates the ossicular bones via its longitudinal motion. Contrasting with the usual flexural waves in plate or membrane structures the bone transmission has almost infinite speed and it creates the phase difference needed to overcome the system stiffness. Theoretical predictions show that the performance of such device is comparable and better than the idealistic plate silencer with interesting comparisons of features. © 2008 Acoustical Society of America-
dc.languageengen_HK
dc.publisherAcoustical Society of America. The Journal's web site is located at http://asa.aip.org/jasa.htmlen_HK
dc.relation.ispartofJournal of the Acoustical Society of America-
dc.rightsJournal of the Acoustical Society of America. Copyright © Acoustical Society of America.-
dc.subjectPhysics-
dc.subjectSound-
dc.titleBroadband duct noise attenuation by a middle-ear mechanismen_HK
dc.typeArticleen_HK
dc.identifier.emailHuang, L: lixi@hku.hken_HK
dc.identifier.authorityHuang, L=rp00119en_HK
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1121/1.4782932-
dc.identifier.hkuros164446en_HK
dc.identifier.volume124-
dc.identifier.issue4-
dc.identifier.spage2516-
dc.identifier.epage2516-
dc.publisher.placeUnited States-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats