Hierarchical optimization for topology design of multi-material compliant mechanisms |
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Authors: | N F Wang K Hu X M Zhang |
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Affiliation: | School of Mechanical and Automobile Engineering, South China University of Technology, Guangzhou, Guangdong, PR China |
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Abstract: | Multi-material topology optimization enables potential design possibilities in the multiphysics and structural designing fields. In this article, a bi-level hierarchical optimization method is introduced to address the multi-material design of compliant mechanisms. The hierarchical optimization develops decomposition approaches allowing the original complex multi-material optimization problem to be reduced to set of low-order single-material optimization sub-problems. The solution of the complex multi-material problem is found as a vector of the single-material sub-problems solutions. All the local sub-problems are solved with the solid isotropic material with penalization method independently, and a stiffness spreading technique is worked out to coordinate components of the global solution of the original problem. Several numerical examples are presented to demonstrate the validity of this method. |
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Keywords: | Topology optimization genetic algorithm structural optimization compliant mechanism |
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