偏置优化对Terfenol-D致动器性能的影响

Effects of Bias Optimization on the Performances of a Terfenol-D Actuator

从分析Terfenol-D材料的磁致伸缩机理出发,引申出预应力和偏置磁场是影响超磁致伸缩致动器性能的重要因素。零偏置磁场驱动下不同预应力对致动器位移输出影响的实验和零预应力下两种偏置磁场对致动器输出性能的比较实验,验证了合理选择预应力和偏置磁场可有效地改善致动器性能的论点。预应力和磁偏置的实验矩阵确定了不同预应力对应的优化偏置磁场,实际设计中需根据致动器要求确定优化的偏置条件。

This paper pointed out that prestress and magnetic bias were important factors to impact the performances of actuators, according to the theory of magnetorstriction. From the experiments of different prestresses without magnetic bias and different magnetic biases without prestress, it was deduced that the actuator output can be improved significantly by appropriate prestress and magnetic bias. The optimized magnetic biases corresponding to different prestresses were ascertained through the experimental matrix. The optimized prestress and magnetic bias should be defined depen ding on the performance demands of actuators in the actual actuator design.