椭圆导角混合柔性铰链的设计计算与性能分析

为满足柔顺机构的大柔度要求,设计了一类新型椭圆导角混合柔性铰链.首先,以卡氏第二定理为基础推导了柔度和回转精度的计算公式,在参数的极限条件下,椭圆导角结构演化出其他三种铰链形式:直圆导角、椭圆直圆和直圆柔性铰链,使得多种柔性铰链的柔度和回转精度的计算公式合并在一组方程中,通过有限元分析验证了计算公式的正确性.其次,讨论...

Design Calculation and Performance Analysis of Elliptical Corner-filleted Hybrid Flexure Hinges#br#

 In order to meet the large compliance requirements of compliant mechanisms, a new type of elliptical corner-filleted flexure hinge was designed. Firstly, the formulas of compliance and rotation accuracy were derived on the basis of the Castiglianos second theorem. Under the limit condition of parameters, the structure of elliptical corner-filleted evolved into three other hinge forms: right circular corner-filleted, elliptical right circular and right circular flexure hinge. The calculation formulas of compliance and rotation accuracy of various flexure hinges were combined in a set of equations. The correctness of the calculation formula was verified by the finite element analysis. Secondly, the influence trend of structural parameters on compliance, rotation accuracy and compliance accuracy ratio was discussed. The analysis results show that compliance and rotation accuracy have the opposite trend with the change of parameters, and reducing the minimum thickness is the best way to improve compliance. Then, the performances of four kinds of flexure hinges were compared. The results show that the elliptical corner-filleted hybrid flexure hinge has the maximum compliance but low rotation accuracy, while the right circular flexure hinge has the high rotation accuracy and superior comprehensive performance, but the minimum compliance. Finally, the examples of the elliptical corner-filleted and the right circular flexure hinge were applied and analyzed. The analysis results show that the novel flexure hinge has significant advantages in rotation range and stress level.