Structural optimization for control of stiffened laminated composite plates using nonlinear mixed integer programming

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dc.contributor.authorMesquita, Luis Clementeen
dc.contributor.committeechairKamat, Manchar P.en
dc.contributor.committeememberHaftka, Raphael T.en
dc.contributor.committeememberSingh, Mahendra P.en
dc.contributor.committeememberMeirovitch, Leonarden
dc.contributor.committeememberHallauer, William L.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2015-05-14T16:36:11Zen
dc.date.available2015-05-14T16:36:11Zen
dc.date.issued1985en
dc.description.abstractThe effect of structural optimization on control of stiffened laminated composite structures is considered. The structural optimization considered here, is the maximization of structural frequencies of the structure subject to maximum weight and frequency separation constraints and an upper bound on weight. The number of plies with a given orientation and the stiffener areas form the two sets of design variables. As the number of plies is restricted to integer values, the optimization problem considered belongs to the class of nonlinear mixed integer problems (NMIP). Several efficiency measures are proposed to reduce the computational cost for solution of the optimization problem. Savings in computer time due to each of the measures is discussed. The control problem is solved using the independent modal space control technique. This technique greatly simplifies the evaluation of the sensitivity of the performance index with respect to the individual frequencies. The effect of different optimization schemes on the control performance is considered. To reduce the probability, that conclusions drawn from numerical results, are purely coincidental, a large number of cases has been studied. It has been concluded that sufficient improvement in control performance can be achieved through structural optimization.en
dc.description.degreePh. D.en
dc.format.extentxi, 137 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/52309en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 13174919en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1985.M478en
dc.subject.lcshStructural analysis (Engineering) -- Mathematicsen
dc.subject.lcshPlates (Engineering) -- Design -- Data processingen
dc.subject.lcshInteger programmingen
dc.titleStructural optimization for control of stiffened laminated composite plates using nonlinear mixed integer programmingen
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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