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Simultaneous analysis and designOptimization techniques are increasingly being used for performing nonlinear structural analysis. The development of element by element (EBE) preconditioned conjugate gradient (CG) techniques is expected to extend this trend to linear analysis. Under these circumstances the structural design problem can be viewed as a nested optimization problem. There are computational benefits to treating this nested problem as a large single optimization problem. The response variables (such as displacements) and the structural parameters are all treated as design variables in a unified formulation which performs simultaneously the design and analysis. Two examples are used for demonstration. A seventy-two bar truss is optimized subject to linear stress constraints and a wing box structure is optimized subject to nonlinear collapse constraints. Both examples show substantial computational savings with the unified approach as compared to the traditional nested approach.
Document ID
19850056843
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Haftka, R. T.
(Virginia Polytechnic Institute and State University Blacksburg, VA, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1985
Publication Information
Publication: AIAA Journal
Volume: 23
ISSN: 0001-1452
Subject Category
Structural Mechanics
Accession Number
85A38994
Funding Number(s)
CONTRACT_GRANT: NAG1-168
Distribution Limits
Public
Copyright
Other

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