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Vibration control and design of composite cantilevers taking into account structural uncertainties and damage

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dc.contributor.authorOh, Donghoonen
dc.contributor.committeechairLibrescu, Liviuen
dc.contributor.committeememberCramer, Mark S.en
dc.contributor.committeememberMeirovitch, Leonarden
dc.contributor.committeememberPlaut, Raymond H.en
dc.contributor.committeememberThangjitham, Suroten
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T21:16:53Zen
dc.date.adate2008-07-28en
dc.date.available2014-03-14T21:16:53Zen
dc.date.issued1993en
dc.date.rdate2008-07-28en
dc.date.sdate2008-07-28en
dc.description.abstractWithin this work a study of the vibrations of laminated composite cantilevers exhibiting structural uncertainties and damage is accomplished. The study is performed within both the Classical Lamination (CLT) and the First-order Transverse Shear Deformation Theories (FSDT). Upon comparing the natural frequencies and mode shapes obtained by both theories, the effects of transverse shear deformation will be emphasized. Other nonclassical effects as e.g. the bending-twist coupling and the warping restraint on the cantilevered structure are also considered. As passive techniques of vibration control, structural tailoring and optimization are implemented. To deal with structural uncertainties, a probabilistic discretization technique for the governing system is developed. Statistical properties of natural frequencies are obtained by means of a second-moment method and a first-order perturbation technique. Structural tailoring is reconsidered to reduce the sensitivity of the dynamic behavior to parameter uncertainties. Next, the damage effect on the structure is considered in the design process. As a result, the problem of the robustness of structures in the presence of damage is addressed. This work also deals with the active feedback control of cantilevered structural systems. An efficient control technique for continuous structures, namely modal control, is adopted and the control gain is obtained by an optimal control law. The comparison of controlled and uncontrolled dynamic responses is made between two models based on CLT and FSDT with emphasis on the influence played by transverse shear deformation and warping restraint.en
dc.description.degreePh. D.en
dc.format.extentxvi, 203 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07282008-142024en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07282008-142024/en
dc.identifier.urihttp://hdl.handle.net/10919/39001en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1993.O4.pdfen
dc.relation.isformatofOCLC# 28529129en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1993.O4en
dc.subject.lcshComposite construction -- Fatigueen
dc.subject.lcshFiber-reinforced ceramicsen
dc.titleVibration control and design of composite cantilevers taking into account structural uncertainties and damageen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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