Continuum topology optimization for monolithic compliant mechanisms of micro-actuators
- 8 Downloads
A multi-objective scheme for structural topology optimization of distributed compliant mechanisms of micro-actuators in MEMS condition is presented in this work, in which mechanical flexibility and structural stiffness are both considered as objective functions. The compliant micro-mechanism developed in this way can not only provide sufficient output work but also have sufficient rigidity to resist reaction forces and maintain its shape when holding the work-piece. A density filtering approach is also proposed to eliminate numerical instabilities such as checkerboards, mesh-dependency and one-node connected hinges occurring in resulting mechanisms. SIMP is used as the interpolation scheme to indicate the dependence of material modulus on element-regularized densities. The sequential convex programming method, such as the method of moving asymptotes (MMA), is used to solve the optimization problem. The validation of the presented methodologies is demonstrated by a typical numerical example.
Key wordsstructural optimization topology optimization compliant mechanisms microactuators filtering approach convex programming
Unable to display preview. Download preview PDF.
- Ananthasuresh, G.K., Kota, S. and Gianchandani, Y., A methodical approach to the design of compliant micro-mechanisms. In Solid-State Sensor and Actuator Workshop, 189–192, 1994.Google Scholar
- Howell, L.L., Compliant Mechanisms, John Wiley &Sons, Inc., New York, 2001.Google Scholar
- Mei, Y.L. and Wang, X.M., A level set method for microstructure design of composite materials, Acta Mechanica Solida Sinica, Vol.17, No.3, 2004, 239–250.Google Scholar
- Luo, Z., Chen, L.P. and Zhang, Y.Q. et al., Multi-stiffness topological optimization for continuum structures with multiple loading cases and a duplicate filtering method, Acta Mechanica Solida Sinica, 2005, Vol.26 No.1, 29–36 (in Chinese).Google Scholar