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Article: Theory of reactive control of low-frequency duct noise

TitleTheory of reactive control of low-frequency duct noise
Authors
Issue Date2000
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jsvi
Citation
Journal Of Sound And Vibration, 2000, v. 238 n. 4, p. 575-594 How to Cite?
AbstractA theoretical prediction is undertaken for low-frequency duct noise control by a compact reactive muffler. The muffler achieves a pressure-release condition over a broad frequency band (from near zero to the first cut-on frequency of the duct) by four flush-mounted pistons, one on each duct wall, with a structure to fluid mass ratio of the order of unity. The concept of a magnetic device is introduced to allow the stiffness of the system to be made sufficiently small, leading to a high transmission loss near the DC frequency. Interactions among the pistons yield negative virtual mass which neutralizes the structural inertia. The inertia neutralization is nearly perfect over a wide frequency band, so that the high transmission loss extends to the first cut-on frequency of the duct. The near-field analysis reveals that the negative virtual mass derives from the plane wave mode of sound radiation due to the mirror effect of the opposite duct wall, an effect which can be maximized by the pairing of pistons on the two opposing walls. For relatively heavy pistons a minimum transmission loss of 14 dB may be obtained for plane waves, while that of relatively compact and light pistons could exceed 30 dB. The effects of residual system stiffness required by the system stability, and of structural damping are shown to be insignificant except for a narrow band near the DC frequency.
Persistent Identifierhttp://hdl.handle.net/10722/156565
ISSN
2015 Impact Factor: 2.107
2015 SCImago Journal Rankings: 1.494
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHuang, Len_US
dc.date.accessioned2012-08-08T08:43:00Z-
dc.date.available2012-08-08T08:43:00Z-
dc.date.issued2000en_US
dc.identifier.citationJournal Of Sound And Vibration, 2000, v. 238 n. 4, p. 575-594en_US
dc.identifier.issn0022-460Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/156565-
dc.description.abstractA theoretical prediction is undertaken for low-frequency duct noise control by a compact reactive muffler. The muffler achieves a pressure-release condition over a broad frequency band (from near zero to the first cut-on frequency of the duct) by four flush-mounted pistons, one on each duct wall, with a structure to fluid mass ratio of the order of unity. The concept of a magnetic device is introduced to allow the stiffness of the system to be made sufficiently small, leading to a high transmission loss near the DC frequency. Interactions among the pistons yield negative virtual mass which neutralizes the structural inertia. The inertia neutralization is nearly perfect over a wide frequency band, so that the high transmission loss extends to the first cut-on frequency of the duct. The near-field analysis reveals that the negative virtual mass derives from the plane wave mode of sound radiation due to the mirror effect of the opposite duct wall, an effect which can be maximized by the pairing of pistons on the two opposing walls. For relatively heavy pistons a minimum transmission loss of 14 dB may be obtained for plane waves, while that of relatively compact and light pistons could exceed 30 dB. The effects of residual system stiffness required by the system stability, and of structural damping are shown to be insignificant except for a narrow band near the DC frequency.en_US
dc.languageengen_US
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jsvien_US
dc.relation.ispartofJournal of Sound and Vibrationen_US
dc.titleTheory of reactive control of low-frequency duct noiseen_US
dc.typeArticleen_US
dc.identifier.emailHuang, L:lixi@hku.hken_US
dc.identifier.authorityHuang, L=rp00119en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1006/jsvi.2000.3090en_US
dc.identifier.scopuseid_2-s2.0-0034506224en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034506224&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume238en_US
dc.identifier.issue4en_US
dc.identifier.spage575en_US
dc.identifier.epage594en_US
dc.identifier.isiWOS:000165718500002-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridHuang, L=7404735514en_US

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