Abstract
Nowadays, piezo-actuated fast tool servo (FTS) is very promising for assisting the diamond turning of microstructured surfaces. Topology optimization is effective for the structure and dimension integrated design of compliant mechanisms for the FTS. In this study, the velocity field level set (VFLS) method is employed to achieve the desired performance for the FTS. A two-stage optimization strategy is proposed to improve the convergence stability and modeling accuracy for the VFLS, which combines a gradual constraint relaxation in the first stage and the gradual weak material removal in the second stage. Furthermore, a comparative study with and without the two-stage strategy is conducted to optimize two examples with different objectives and multiple constraints. The optimized results with verification by finite element simulations well demonstrate the superiority of the proposed two-stage VFLS-based topology optimization.
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