Investigation of a compact acoustic source array for the active control of aircraft engine fan noise

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dc.contributor.authorRosette, Keith Andrewen
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:52:37Zen
dc.date.adate2008-12-30en
dc.date.available2014-03-14T21:52:37Zen
dc.date.issued1994en
dc.date.rdate2008-12-30en
dc.date.sdate2008-12-30en
dc.description.abstractAn array of small, lightweight acoustic sources was investigated to determine how such an arrangement of sources would acoustically interact with a duct similar to that of a turbofan engine inlet. The sources were cylindrically curved aluminum panels excited in vibration by the application of a sinusoidally varying voltage to a piezoceramic actuator bonded to them. The finite element method was used as a design tool to size the panel based on desired vibration characteristics. A boundary element acoustic analysis was used to predict the acoustic output from various arrangements of sources. The central portion of the research was a series of experiments using an array of twelve sources arranged circumferentially in a duct. Measurements of the performance of each source revealed that the performance of the acoustic sources varied from source to source. This variation was assumed to have been caused by differences in the quality of the bond of each of the piezoceramic actuators to the panels. Directivity measurements were made in the far field. Measurements were also taken of the pressure field established in the duct cross-section. Modal decomposition was applied to the data. It was found that the dominant acoustic modes in the duct are those whose cut-on frequencies were near the frequency of excitation.en
dc.description.degreeMaster of Scienceen
dc.format.extentxvi, 193 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-12302008-063020en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12302008-063020/en
dc.identifier.urihttp://hdl.handle.net/10919/46428en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.R674.pdfen
dc.relation.isformatofOCLC# 31155824en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.R674en
dc.subject.lcshAcoustic surface wave devicesen
dc.subject.lcshAirplanes -- Turbofan engines -- Noiseen
dc.subject.lcshFans (Machinery) -- Noiseen
dc.titleInvestigation of a compact acoustic source array for the active control of aircraft engine fan noiseen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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