超磁致微致动器能量耦合转换有限元分析

FEM analysis of magneto-mechanical energy coupling and transformation for GMM actuator

根据超磁致材料(giantmagnetostrictivematerial,GMM)磁-机耦合能量转换的本构关系,采用有限元(FEM)耦合迭代方法,设计了超磁致微致动器,研究了超磁致介质的力学特性(应力、应变)与磁学特性(磁场强度、磁感应).对算法的考察分析表明,不同类型负载下FEM耦合迭代算法均具有良好的收敛性能.将FEM耦合迭代计算的理论结果与实验结果作了比较,两者比较吻合.对不同预压力下器件的响应特性进行了分析,结果表明,在6MPa预压力下,致动器具有较好的线性和较大的应变量,二者取得较好的折中.

Based on the magneto-mechanical energy coupling and transformation of giant magnetostrictive materials （GMM）, the coupled magnetic field and mechanical field were simulated using the coupling iteration （CI） of the finite element method （FEM）. A GMM actuator was designed using CIFEM, then comparison of deformations between the calculated results using CIFEM and those from experimental measurements were shown. The convergence abilities of this CIFEM under different prestress values and different load types were investigated based on the designed actuator. The output deformation properties under different input currents and prestresses were studied. And it was shown that there is good compromise between good linearity and large strain under the prestress of 6 MPa.