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dc.contributor.authorBichiou, Youssefen_US
dc.date.accessioned2016-07-09T06:00:19Z
dc.date.available2016-07-09T06:00:19Z
dc.date.issued2015-01-15en_US
dc.identifier.othervt_gsexam:3997en_US
dc.identifier.urihttp://hdl.handle.net/10919/71760
dc.description.abstractAirplane wings, turbine blades and other structures subjected to air or water flows, can undergo motions depending on their flexibility. As such, the performance of these systems depends strongly on their geometry and material properties. Of particular importance is the contribution of different nonlinear aspects. These aspects can be of two types: aerodynamic and structural. Examples of aerodynamic aspects include but are not lomited to flow separation and wake effects. Examples of structural aspects include but not limited to large deformations (geometric nonlinearities), concentrated masses or elements (inertial nonlinearities) and freeplay. In some systems, and depending on the parameters, the nonlinearities can cause multiple solutions. Determining the effects of nonlinearities of an aeroelastic system on its response is crucial. In this dissertation, different aeroelastic configurations where nonlinear aspects may have significant effects on their performance are considered. These configurations include: the effects of the wake on the flutter speed of a wing placed under different angles of attack, the impacts of the wing rotation as well as the aerodynamic and structural nonlinearities on the flutter speed of a rotating blade, and the effects of the recently proposed nonlinear energy sink on the flutter and ensuing limit cycle oscillations of airfoils and wings. For the modeling and analysis of these systems, we use models with different levels of fidelity as required to achieve the stated goals. We also use nonlinear dynamic analysis tools such as the normal form to determine specific effects of nonlinearities on the type of instability.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectNonlinear Dynamicsen_US
dc.subjectNormal Formen_US
dc.subjectHopf Bifurcationen_US
dc.subjectUnsteady Aerodynamicsen_US
dc.subjectQuasi-steady Aerodynamicsen_US
dc.subjectUnsteady Vortex Lattice Methoden_US
dc.subjectControlen_US
dc.subjectWind Energyen_US
dc.subjectWind Turbine Bladesen_US
dc.titleModeling Analysis and Control of Nonlinear Aeroelastic Systemsen_US
dc.typeDissertationen_US
dc.contributor.departmentEngineering Science and Mechanicsen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEngineering Mechanicsen_US
dc.contributor.committeechairHajj, Muhammad R.en_US
dc.contributor.committeememberRagab, Saad A.en_US
dc.contributor.committeememberDe Vita, Raffaellaen_US
dc.contributor.committeememberPatil, Mayuresh J.en_US
dc.contributor.committeememberAl-Haik, Marwanen_US


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