Structural optimization procedures usually start from a given design topology and vary proportions or boundary shapes to achieve optimality under various constraints. This article presents an 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. This topology is then transformed to a realizable design using computer vision techniques, parameterized, and treated in detail by size and shape optimization. A fully automated process is described for trusses. Examples for two-dimensional solid structures are also discussed.
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