Active control of a coupled plate-cylinder system

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dc.contributor.authorToffin, Ericen
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:38:38Zen
dc.date.adate2009-06-16en
dc.date.available2014-03-14T21:38:38Zen
dc.date.issued1994en
dc.date.rdate2009-06-16en
dc.date.sdate2009-06-16en
dc.description.abstractAn analytical expression for the sound pressure radiated into the far-field by a coupled plate-cylinder system is derived. The system is composed of a rigid plate mounted inside a finite length simply-supported cylindrical shell via a fixed number of active-passive mounts. A harmonic point-force disturbance is applied to the plate. Various active control approaches are applied to minimize the acoustic pressure radiated by the coupled system. The Active Structural Acoustic Control (ASAC) approaches include the control of the acoustic pressure in one or several directions of radiation, the control of the total radiated power, the control of the power radiated in a sector and the control of selected components associated with circumferential cylinder modes. The Active Vibration Control (AVC) approach is the control of the radial vibration at the points of attachment of the mounts on the cylinder. Numerical calculations show that the radiated pressure can be controlled using active-passive mounts for all these approaches. However, comparisons in terms of control efficiency and control effort show that ASAC yield better results than AVC. Moreover, ASAC enables directional control of sound and AVC does not. Opposed and parallel active-passive mount configurations are compared. The results show that the first arrangement requires much larger control forces on-resonance, but the two methods show similar performance off-resonance.en
dc.description.degreeMaster of Scienceen
dc.format.extentxix, 214 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-06162009-063337en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06162009-063337/en
dc.identifier.urihttp://hdl.handle.net/10919/43338en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.T644.pdfen
dc.relation.isformatofOCLC# 30830583en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.T644en
dc.subject.lcshCylinders -- Vibrationen
dc.subject.lcshNoise controlen
dc.subject.lcshSound pressureen
dc.titleActive control of a coupled plate-cylinder systemen
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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