A broadband passive-active sound absorption system

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dc.contributorVirginia Tech. Department of Mechanical Engineering. Vibration and Acoustics Laboratoriesen
dc.contributor.authorSmith, Jerome P.en
dc.contributor.authorJohnson, Brody D.en
dc.contributor.authorBurdisso, Ricardo A.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessed2015-05-12en
dc.date.accessioned2015-05-27T19:50:21Zen
dc.date.available2015-05-27T19:50:21Zen
dc.date.issued1999-11-01en
dc.description.abstractIn recent years, hybrid absorption systems have been implemented which achieve high sound absorption over a broad frequency range. This work is an experimental study of a broadband hybrid absorption system which is comprised of a layer of sound-absorbing material (the passive component) positioned at a distance from a movable wall (the active component) inside an impedance tube. The movable wall is used to impose desired boundary conditions in the cavity behind the passive layer, thereby increasing the absorption of the system at frequencies where the passive material is not independently effective. Both pressure-release (i.e., minimizing the pressure at the back surface of the layer) and impedance-matching (i.e., minimizing the reflected wave from the layer) boundary conditions are studied. The performance of the hybrid system for these two boundary conditions is compared for broadband disturbances over a frequency range of 100-1000 Hz. The unmodified passive system showed absorption coefficients greater than 0.7 only above 500 Hz, while the impedance-matching condition yielded absorption coefficients of 0.8 to 1.0 over the 100-1000-Hz range. The impedance-matching condition provided significantly better absorption than that achieved with the pressure-release condition. The sensitivity of these control approaches to system parameters is also investigated.en
dc.format.extent7 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSmith, J. P., Johnson, B. D., & Burdisso, R. A. (1999). A broadband passive-active sound absorption system. Journal of the Acoustical Society of America, 106(5), 2646-2652. doi: 10.1121/1.428094en
dc.identifier.doihttps://doi.org/10.1121/1.428094en
dc.identifier.issn0001-4966en
dc.identifier.urihttp://hdl.handle.net/10919/52671en
dc.identifier.urlhttp://scitation.aip.org/content/asa/journal/jasa/106/5/10.1121/1.428094en
dc.language.isoen_USen
dc.publisherAcoustical Society of Americaen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAcoustic absorptionen
dc.subjectBoundary value problemsen
dc.subjectAbsorption coefficienten
dc.subjectControl systemsen
dc.titleA broadband passive-active sound absorption systemen
dc.title.serialJournal of the Acoustical Society of Americaen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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