Active control of sound radiation from fluid loaded plates

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dc.contributor.authorGu, Yien
dc.contributor.committeechairFuller, Christopher R.en
dc.contributor.committeememberRobertshaw, Harry H.en
dc.contributor.committeememberBurdisso, Ricardo A.en
dc.contributor.committeememberSingh, Mahendra P.en
dc.contributor.committeememberMahan, James Roberten
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:21:16Zen
dc.date.adate2005-10-14en
dc.date.available2014-03-14T21:21:16Zen
dc.date.issued1992-10-15en
dc.date.rdate2005-10-14en
dc.date.sdate2005-10-14en
dc.description.abstractActive control of sound radiation due to subsonic wave scattering from an infinite or a finite fluid-loaded plate excited below the critical frequency is analytically studied. The disturbance is caused by a flexural wave in an infinite plate, or by a point force on a finite plate at subsonic frequencies. The wave scattering is caused by discontinuities on the plate or by the boundary conditions. A feed-forward control approach is applied by implementing either point/line forces or piezoelectric actuators on the plate. The amplitude and phase of control forces are determined by the optimal solution of a cost function which minimizes the far-field radiated acoustic power over a prescribed surface in the half space of the fluid field. The results show that for subsonic excitations, high global reduction in radiated pressure is possible with properly located active control forces. The number and location of control forces employed in order to obtain high control performance are related to the excitation frequency. The far-field sound radiation directivity pattern, the modal amplitudes of the plate vibration, the plate vibration autospectrum in the wave number domain, and the near-field intensity distribution are extensively studied in order to uncover the mechanisms of control.en
dc.description.degreePh. D.en
dc.format.extentxxiv, 269 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10142005-103121en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10142005-103121/en
dc.identifier.urihttp://hdl.handle.net/10919/39888en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1992.G83.pdfen
dc.relation.isformatofOCLC# 27697045en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1992.G83en
dc.subject.lcshNoise controlen
dc.subject.lcshPlates (Engineering) -- Noiseen
dc.titleActive control of sound radiation from fluid loaded platesen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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