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integrated topology and shape optimization in structural designStructural optimization procedures usually start from a given design topology and vary its proportions or boundary shapes to achieve optimality under various constraints. Two different categories of structural optimization are distinguished in the literature, namely sizing and shape optimization. A major restriction in both cases is that the design topology is considered fixed and given. Questions concerning the general layout of a design (such as whether a truss or a solid structure should be used) as well as more detailed topology features (e.g., the number and connectivities of bars in a truss or the number of holes in a solid) have to be resolved by design experience before formulating the structural optimization model. Design quality of an optimized structure still depends strongly on engineering intuition. This article presents a novel approach for initiating formal structural optimization at an earlier stage, where the design topology is rigorously generated in addition to selecting shape and size dimensions. A three-phase design process is discussed: an optimal initial topology is created by a homogenization method as a gray level image, which is then transformed to a realizable design using computer vision techniques; this design is then parameterized and treated in detail by sizing and shape optimization. A fully automated process is described for trusses. Optimization of two dimensional solid structures is also discussed. Several application-oriented examples illustrate the usefulness of the proposed methodology.
Document ID
19940004700
Document Type
Conference Paper
Authors
Bremicker, M.
(Michigan Univ. Ann Arbor, MI, United States)
Chirehdast, M.
(Michigan Univ. Ann Arbor, MI, United States)
Kikuchi, N.
(Michigan Univ. Ann Arbor, MI, United States)
Papalambros, P. Y.
(Michigan Univ. Ann Arbor, MI, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1990
Publication Information
Publication: NASA. Langley Research Center, The Third Air Force(NASA Symposium on Recent Advances in Multidisciplinary Analysis and Optimization
Subject Category
STRUCTURAL MECHANICS
Funding Number(s)
CONTRACT_GRANT: NSF DDM-89-17430
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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