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- 2016
平面柔性铰链机构的柔度计算方法
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Abstract:
作为一种高精度的微动机构, 柔性铰链机构已经在多个工业领域得到应用。该文针对平面柔性铰链机构, 对机构设计中柔度计算方法进行了研究。在分析了一般柔性铰链的柔度计算方法的基础上, 利用虚功原理, 推导出单个铰链的变形/受力相较于整个机构的变形/受力的关系; 利用矩阵分析方法, 结合串联机构和并联机构的单元与终端的变形/受力的互逆形式的传递规律, 分别获得了简洁的串并联柔性铰链机构的柔度计算公式。针对3种典型的串并联柔性铰链机构, 进行了柔度计算和不同机构参数与各方向柔度关系的分析, 并利用经典的有限元法进行了对比仿真实验。实验结果表明: 该方法的计算结果与有限元法最大相差7%, 平均相差3%。这表明该方法能够为平面柔性铰链机构的设计和结构优化提供参考。
Abstract：Flexure-based mechanisms are widely used in industry as highly precise micro-motion mechanisms. This paper presents a compliance calculation method for planar flexure-based mechanisms. The compliance of flexure hinges is used to relate the deformations to the loads on flexure member with the end-effector motion obtained using the virtual work principle. Then, a matrix method is used to derive concise compliance equations for serial and parallel flexure mechanisms. The compliance and the relationship between the compliance terms and variable geometric parameters are analyzed for three typical flexure-based mechanisms. The model results compare well with finite element method (FEM) predictions with a maximum difference of 7% and an average difference of 3%. This method provides theoretical and technical support for the design and optimization of flexure-based mechanisms.
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