杠杆放大式双足压电直线电机的建模及优化设计

Modeling and Optimized Design of Double-feet Piezoelectric Linear Motor Based on the Lever Amplification Mechanism

杠杆放大机构设计对于杠杆放大式双足压电直线电机的性能起决定性作用。该文分析了杠杆放大式双足压电电机的作动机理,建立了基于柔性铰链的杠杆放大机构的动力学模型,对机构放大率进行了理论计算,纵向、横向理论放大率分别为3.12和1.98。利用有限元软件进行仿真分析,理论计算与有限元仿真误差分别为3.1%、14.6%。在此基础上,利用遗传算法对杠杆放大机构柔性铰链结构参数进行优化设计,优化后驱动足纵向、横向位移分别提高了17.6%、8.1%。

The design of the lever amplification mechanism plays a crucial role in the performance of double-feet piezoelectric linear motor based on the lever amplification principle.The actuating mechanism of double-feet piezoelectric linear motor based on the lever amplification mechanism was analyzed and the dynamic model of the lever amplification mechanism based on the flexure hinge is established in this paper.The theoretical amplification ratio is calculated,which are equal to 3.12 and 1.98 in the longitudinal and lateral direction respectively.Moreover,the FEA software was used for simulation analysis.The error between theory calculation and simulating calculation is3.1% and 14.6% respectively.On the basis of the simulation analysis,the design of the structure parameters of flexure hinges in the lever amplification mechanism are carried out by using the genetic algorithm.The displacements of driving foot in the longitudinal and lateral direction are improved by 17.6% and 8.1%respectively after the optimized design.