超磁致伸缩致动器的磁-机械强耦合模型

稀土一铁超磁致伸缩材料作为一种新型功能材料，其应用越来越受到人们的关注。为了有效地设计、开发超磁致伸缩材料的器件，必须建立材料器件的输入输出模型。利用能量变分原理，针对研制的超磁致伸缩致动器，建立了系统的磁一机械强耦合模型，并应用有限元法计算了致动器的输入电流与输出位移的关系曲线。计算值与实验值比较吻合，表明所建立的模型能够反映致动器的输入输出关系，模型对于设计超磁致伸缩器件、优化设计方案具有重要意义。

MAGNETO-MECHANICAL STRONG COUPLED MODEL FOR A GIANT MAGNETOSTRICTIVE ACTUATOR

The rare-earth iron giant magnetostrictive materials present more and more applications as a new type functional materials. In order to design magnetostrictive actuators, modelling of the input current dependence of output displacement for the actuator is necessary. Magneto-mechanical strong coupled model for a giant magnetostrictive actuator was founded based on the energy functional. The input current dependence of output displacement for the actuator was calculated by means of the finite element method. Comparison between the calculating result and experimental result for the actuator was carried out and it was found that they were in agreement well. This indicates that the model can express the relation between the input current and the output displacement. Therefore it is important to design a giant magnetostrictive actuator.