超磁致伸缩致动器动态线性模型及实验验证

Dynamic Linearity Model and Experiment for a Giant Magnetostrictive Actuator

在电磁学原理和机械振动原理的基础上,通过分析致动器的Terfenol-D棒、弹簧和输出顶杆的机械阻抗,建立了致动器的动态线性模型,该模型描述了输出位移和输入电流间的关系。应用该模型对致动器的输出位移进行计算,计算结果与实验结果比较发现,在频率范围0～2200Hz区间内,可以采用该模型描述致动器在不同频率交流磁场作用下的输出位移特性,通过实验验证了模型的正确性和实用性。研究结果对于致动器的设计、优化与应用奠定了基础。

A dynamic linearity model of the giant magnetostrictive actuator has been founded, based on the electro-magnetic theory and mechanical vibration principle. The model quantifies the relation between output displacement and input current by analyzing mechanical ＂impedance of the Terfenol-D rod, spring and output shaft for the actuator. The output displacement for the actuator has been calculated and it is found that the dynamic linearity model can describe the output displacement characteristic for the actuator under the frequency from 0Hz to 2200Hz. The experimental results have confirmed the model＇s validity and practicability, and the model can provide the groundwork for the design and optimum of actuators.