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Technology and Engineering
- ISSN: 2333-2581
- Modern Environmental Science and Engineering
Multi-objective Optimization of a Linear Flexure-Based Mechanism Using Pseudo Rigid-Body Diagram Analysis and FEA-Based Response Surface Methodology
Khien-Van Nguyen1,2, Hoang-Huy Pham3, and Huy-Tuan Pham1
1. Faculty of Mechanical Engineering, HCM City University of Technology and Education, Vietnam
2. Vocational and Technical College of Nam Sai Gon, Vietnam
3. Faculty of Mechanical Engineering, HCM City University of Technology, Vietnam
Abstract: This paper presents the optimization design of a linear flexure-based mechanism (LFBM). The design process includes three phases: (1) building a Pseudo Rigid-Body (PRB) model for the mechanism (2) converting the PRB diagram into a compliant mechanism (CM) model, and (3) optimizing the CM model using the Response Surface Methodology. In the design of the LFBM, circular flexure hinges are used to provide accurate linear movement and large displacement. The circular flexure hinges are combined with rigid links to synthesize lever mechanisms and parallelogram mechanisms to gain large magnification, increase rigidity and decrease parasitic motion. The PRB diagram analysis method and surface response methodology based on finite element analysis (FEA) are used to solve the multi-objective optimization. The objectives of the optimization are to improve the static characteristics as well as the dynamics of the linear motion mechanism. FEA-based experiments are conducted to evaluate the validity of the model. The analysis and simulation results show that the operational range of the LFBM is larger than 200 μm, and the first-order natural frequency is above 350 Hz.
Key words: flexure mechanism, pseudo rigid-body diagram, response surface methodology, ANOVA
