To solve the problem of insufficient constant-force stroke of the compliant constant force mechanism (CFM), a FEA-based optimization method based on structural parameters is proposed in this paper. Firstly, a flexure-based constant force module (FBCFM) combined with a Z-shaped beam and a bi-stable beam is designed. By analyzing the force-displacement relationship of the two kind beams, the architectural parameters related to the constant force characteristic of the FBCFM are derived. Then, the initial constant-force stroke with 2.2 mm and output constant force with 13.8 N of the FBCFM are obtained by experimental studies. Furthermore, to explore the parametric effects for the designed FBCFM, parametric evaluation is conducted via MATLAB. Finally, the optimal solution set of architecture parameters is obtained with FEA-based optimization method. Through experimental verification, the constant-force stroke of the optimized FBCFM is 4.5 mm with constant force 8.5 N. The optimization results show the effectiveness and feasibility of the proposed FEA-based optimization method.

针对柔性恒力机构（CFM）恒力行程不足的问题，提出了一种基于结构参数的有限元优化方法。首先，设计了一个结合Z形梁和双稳态梁的基于弯曲的恒力模块（FBCFM）。通过分析两种梁的力位移关系，推导出与FBCFM恒力特性相关的建筑参数。然后，通过实验研究获得了 FBCFM 的 2.2 mm 初始恒力冲程和 13.8 N 输出恒力。此外，为了探索设计的 FBCFM 的参数效应，通过 MATLAB 进行参数评估。最后，通过基于有限元分析的优化方法得到架构参数的最优解集。