Modeling Analysis and Control of Nonlinear Aeroelastic Systems

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dc.contributor.authorBichiou, Youssefen
dc.contributor.committeechairHajj, Muhammad R.en
dc.contributor.committeememberRagab, Saad A.en
dc.contributor.committeememberDe Vita, Raffaellaen
dc.contributor.committeememberPatil, Mayuresh J.en
dc.contributor.committeememberAl-Haik, Marwanen
dc.contributor.departmentEngineering Science and Mechanicsen
dc.date.accessioned2016-07-09T06:00:19Zen
dc.date.available2016-07-09T06:00:19Zen
dc.date.issued2015-01-15en
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
dc.description.degreePh. D.en
dc.format.mediumETDen
dc.identifier.othervt_gsexam:3997en
dc.identifier.urihttp://hdl.handle.net/10919/71760en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectNonlinear Dynamicsen
dc.subjectNormal Formen
dc.subjectHopf Bifurcationen
dc.subjectUnsteady Aerodynamicsen
dc.subjectQuasi-steady Aerodynamicsen
dc.subjectUnsteady Vortex Lattice Methoden
dc.subjectControlen
dc.subjectWind Energyen
dc.subjectWind Turbine Bladesen
dc.titleModeling Analysis and Control of Nonlinear Aeroelastic Systemsen
dc.typeDissertationen
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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