基于特征参数的DCA-LET结构设计与性能分析

Structure Design and Performance Analysis of DCA-LET Based on Characteristic Parameters

设计了一种基于双C型结构的柔性铰链,称为DCA-LET柔性铰链。定义了影响该柔性铰链性能的特征参数,通过对8组不同特征参数实例的仿真分析,拟合了特征参数与等效弹簧刚度之间的关系,推导了基于该铰链特征参数的等效弹簧刚度的理论计算公式并且引入了修正系数。通过3组实例的理论计算和有限元仿真分析,验证了理论计算公式以及修正系数的正确性。通过对比3组不同特征参数的DCA-LET柔性铰链与内LET柔性铰链的弯曲性能与抗拉性能,得出控制特征参数能够控制该柔性铰链的弯曲性能,同时保证其抗拉压性能并没有明显下降。

LEMs achieve the movement and force transmission through flexure hinges,so it is very important to design flexure hinges. A new type of flexure hinge based on double C-type structure was proposed,named as DCA-LET flexure hinge. The characteristic parameters influencing the performance of the flexure hinge were defined. Based on the simulation analysis of eight examples of different characteristic parameters,the fitting curve of the relationship between the characteristic parameters and the simulation values of the equivalent stiffness was obtained. The theoretical formula of equivalent spring stiffness based on the characteristic parameters of the hinge was deduced and the correction factor was introduced. The correctness of theoretical calculation formula and correction factor was verified by theoretical calculation and finite element simulation of three examples. The bending and tensile properties of three DCA-LET flexure hinges with different characteristic parameters and inside LET flexure hinge were compared,and the results showed that the DCA-LET flexure hinge had better overall performance than the LET flexure hinge. The characteristic parameters can control the bending performance of DCALET hinge,and its tensile and compression properties had no significant decrease,which provided an effective method for the design of the flexure hinges.