大功率超磁致伸缩作动器的仿真与试验

Simulation and Experiment of High-Power Giant Magnetostrictive Actuator

分析了结构参数对大功率超磁致伸缩作动器动态性能的影响。为了提高作动器的动态性能,其驱动线圈采用减少匝数、增加线径、大电流驱动的设计方案;选取了超磁致伸缩材料(GMM)棒最佳的预压应力和磁场强度,计算确定了GMM棒的几何参数;建立了以牛顿第二定律为基础的作动器阶跃响应、参数变化的模型,利用MATLAB对其进行了仿真分析。结果表明,GMM棒长度和直径、负载端质量对作动器力和位移输出有重要影响。研究结果可为超磁致伸缩作动器的结构优化与设计提供参考。

The influence of structural parameters on the dynamic performance of high power giant magnetostrictive actuator was analyzed.In order to improve the dynamic performance of the actuator,the design scheme of the driving coil consists of reducing the number of turns,increasing the diameter of the line,and driving a large current,the optimal pre-stress and magnetic intensities of the GMM rod were selected to calculate the geometric parameters of the GMM rod.A mathematical model based on Newton s second law for the step response and parameter variation of the actuator was established and simulated using MATLAB.The results show that the length and diameter of the GMM rod and the mass of the loading terminal have an important influence on the output of actuator s force and displacement.The results of the study provide reference for the structure optimization and design of giant magnetostrictive actuator.