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dc.contributor.authorLiu, Shaobinen_US
dc.date.accessioned2013-06-29T08:00:17Z
dc.date.available2013-06-29T08:00:17Z
dc.date.issued2013-06-28en_US
dc.identifier.othervt_gsexam:1344en_US
dc.identifier.urihttp://hdl.handle.net/10919/23282
dc.description.abstractIn this dissertation, a continuum sensitivity method is developed for efficient and accurate computation of design derivatives for nonlinear aeroelastic structures subject to transient
aerodynamic loads. The continuum sensitivity equations (CSE) are a set of linear partial
differential equations (PDEs) obtained by differentiating the original governing equations of
the physical system. The linear CSEs may be solved by using the same numerical method
used for the original analysis problem. The material (total) derivative, the local (partial)
derivative, and their relationship is introduced for shape sensitivity analysis. The CSEs are
often posed in terms of local derivatives (local form) for fluid applications and in terms of total
derivatives (total form) for structural applications. The local form CSE avoids computing
mesh sensitivity throughout the domain, as required by discrete analytic sensitivity methods.
The application of local form CSEs to built-up structures is investigated. The difficulty
of implementing local form CSEs for built-up structures due to the discontinuity of local
sensitivity variables is pointed out and a special treatment is introduced. The application
of the local form and the total form CSE methods to aeroelastic problems are compared.
Their advantages and disadvantages are discussed, based on their derivations, efficiency,
and accuracy. Under certain conditions, the total form continuum method is shown to be
equivalent to the analytic discrete method, after discretization, for systems governed by a
general second-order PDE. The advantage of the continuum sensitivity method is that less
information of the source code of the analysis solver is required. Verification examples are
solved for shape sensitivity of elastic, fluid and aeroelastic problems.
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.subjectContinuum Sensitivityen_US
dc.subjectShape Sensitivityen_US
dc.subjectAeroelasticityen_US
dc.subjectOptimizationen_US
dc.subjectFluid-structure interactionen_US
dc.titleContinuum Sensitivity Method for Nonlinear Dynamic Aeroelasticityen_US
dc.typeDissertationen_US
dc.contributor.departmentAerospace and Ocean Engineeringen_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.disciplineAerospace Engineeringen_US
dc.contributor.committeechairCanfield, Robert Arthuren_US
dc.contributor.committeememberHajj, Muhammad R.en_US
dc.contributor.committeememberKapania, Rakesh K.en_US
dc.contributor.committeememberRoy, Christopher Johnen_US
dc.contributor.committeememberPatil, Mayuresh J.en_US


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