Fan noise reduction from turbofan engines using adaptive Herschel-Quincke tubes

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dc.contributor.assigneeVirginia Tech Intellectual Properties, Inc.en
dc.contributor.inventorBurdisso, Ricardo A.en
dc.contributor.inventorSmith, Jerome Peteren
dc.date.accessed2016-08-19en
dc.date.accessioned2016-08-24T17:54:12Zen
dc.date.available2016-08-24T17:54:12Zen
dc.date.filed1998-09-24en
dc.date.issued2000-09-05en
dc.description.abstractAn array of adaptive or fixed Herschel-Quincke tubes aligned in a circumferential or helical array about an inlet of a turbofan engine. The array of tubes effectively divide the acoustic energy generated by the engine. One of the energy components propagates within the tubes while the other propagates within the engine compartment. At some time certain, the acoustic energy in the tubes is reintroduced into the engine compartment to cancel the acoustic energy remaining in the engine as it propagates from the fan towards the inlet and outlet openings.en
dc.format.mimetypeapplication/pdfen
dc.identifier.applicationnumber9159634en
dc.identifier.patentnumber6112514en
dc.identifier.urihttp://hdl.handle.net/10919/72423en
dc.identifier.urlhttp://pimg-fpiw.uspto.gov/fdd/14/125/061/0.pdfen
dc.language.isoen_USen
dc.publisherUnited States Patent and Trademark Officeen
dc.subject.cpcB64D33/02en
dc.subject.cpcB64D2033/0206en
dc.subject.cpcB64D2033/0286en
dc.subject.cpcF02C7/045en
dc.subject.cpcF04D29/663en
dc.subject.cpcF05D2260/96en
dc.subject.cpcF05D2260/962en
dc.subject.cpcG10K11/175en
dc.subject.cpcY02T50/671en
dc.subject.uspc181/213en
dc.subject.uspcother181/250en
dc.subject.uspcother60/226.1en
dc.titleFan noise reduction from turbofan engines using adaptive Herschel-Quincke tubesen
dc.typePatenten
dc.type.dcmitypeTexten
dc.type.patenttypeutilityen

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