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• W2054754585 abstract "Engineering features are regular and simple shape units containing specific engineering significance. It is useful to combine feature design with structural optimization. This paper presents a generic method to design engineering features for level set based structural optimization. A Constructive Solid Geometry based Level Sets (CSGLS) description is proposed to represent a structure based on two types of basic entities: a level set model containing either a feature shape or a freeform boundary. By treating both entities implicitly and homogeneously, the optimal design of engineering features and freeform boundary are unified under the level set framework. For feature models, constrained affine transformations coupled with an accurate particle level set updating scheme are utilized to preserve feature characteristics, where the design velocity approximates continuous shape variation via a least squares fitting. Meanwhile, freeform models undergo a standard shape and topology optimization using a semi-Lagrangian level set scheme. With this method, various feature requirements can be translated into a CSGLS model, and the constrained motion provides flexible mechanisms to design features at different stages of the model tree. As a result, a truly optimal structure with engineering features can be created in a convenient way. Several numerical examples are provided to demonstrate the applicability and potential of this method." @default.
• W2054754585 created "2016-06-24" @default.
• W2054754585 creator A5068828641 @default.
• W2054754585 creator A5084400088 @default.
• W2054754585 date "2013-12-01" @default.
• W2054754585 modified "2023-09-26" @default.
• W2054754585 title "Engineering feature design for level set based structural optimization" @default.
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• W2054754585 doi "https://doi.org/10.1016/j.cad.2013.06.016" @default.
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