Show simple item record

dc.contributor.authorFaris, Waleed Fekryen_US
dc.date.accessioned2011-08-22T18:53:11Z
dc.date.available2011-08-22T18:53:11Z
dc.date.issued2003-12-16en_US
dc.identifier.otheretd-01142004-134524en_US
dc.identifier.urihttp://hdl.handle.net/10919/11100
dc.description.abstractThe nonlinear static and dynamic response of circular and annular plates under electrostatic, thermal, and combined loading is investigated. The main motivation for the study of these phenomena is providing fundamental insights into the mechanics of micro-electro-mechanical-systems (MEMS). MEMS devices are usually miniaturization of the corresponding macro-scale devices. The basic mechanics of the components of many MEMS devices can be modeled using conventional structural theories. Some of the most used and actively researched MEMS devices- namely pressure sensors and micropumps- use circular or annular diaphragms as principle components. The actuation and sensing principles of these devices are usually electrostatic in nature. Most MEMS devices are required to operate under wide environmental conditions, thus, a study of thermal effects on the performance of these devices is a major design consideration. There exists a wide arsenal of analytic, semi-analytic, and numerical tools for nonlinear analysis of continuous systems. The present work uses different tools for the analysis of different types of problems. The selection of the analysis tools is guided by two principles. The first consideration is that the analysis should reveal the fundamental mechanics and dynamics of the problem rather than simply generating numerical data. The second consideration is numerical efficiency. Guided by the same principles, the basic structural model adopted in this work is the von-Karman plate model. This model captures the basic nonlinear phenomena in the plate with minimal complexity in the equations of motion, thus providing a balance between simplicity and accuracy. We address a wide array of problems for a variety of loading and boundary conditions. We start by analyzing annular plates under static electrostatic loading including the variation of the plate natural frequencies with the applied voltage. We also analyze parametric resonances in plates subjected to sinusoidally varying thermal loads. We investigate the prebuckling and postbuckling static thermal response and the corresponding variation of the natural frequencies. Finally, we close by investigating the problem of a circular plate under a combination of thermal and electrostatic loading. The results of this investigation demonstrate the importance of including nonlinear phenomena in the modeling of MEMS devices both for correct quantitative predictions and for qualitative description of operations.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartthesis.pdfen_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.subjectThermalen_US
dc.subjectElectricalen_US
dc.subjectAnnular Platesen_US
dc.subjectMEMSen_US
dc.subjectCircualr Platesen_US
dc.subjectNonlinaer Dymnamicsen_US
dc.titleNonlinear Dynamics of Annular and Circular Plates Under Thermal and Electrical Loadingsen_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 Science and Mechanicsen_US
dc.contributor.committeechairNayfeh, Ali H.en_US
dc.contributor.committeememberWicks, Alfred L.en_US
dc.contributor.committeememberKohler, Werner E.en_US
dc.contributor.committeememberLibrescu, Liviuen_US
dc.contributor.committeememberRagab, Saad A.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01142004-134524en_US
dc.date.sdate2004-01-14en_US
dc.date.rdate2005-01-27
dc.date.adate2004-01-27en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record