【摘要】 超磁致伸缩执行器工作时超磁致伸缩材料的磁导率会随着应力变化而变化,并存在磁滞损失和涡流损失等非线性问题,同时磁场、电场、温度场及机械应力场之间存在耦合.建立了超磁致伸缩执行器电场、磁场和机械应力场3场耦合的三维非线性动态有限元模型,考虑了超磁致伸缩执行器Terfenol-D棒质量、预压应力、偏置磁场、磁滞和涡流损失.使用Jile-Autherton磁化模型计算磁滞损失,在商业有限元软件FEMLAB中实现了有限元模型.模型仿真结果和实验结果相一致,验证了所建立模型的正确性.更多还原

【Abstract】 The permeability of giant magnetostrictive material varies with the changing applied stress when giant magnetostrictive actuator(GMA) works.The nonlinearity due to the losses of magnetic hysteresis and eddy current and the interaction of the magnetic field,electric field,thermal field and mechanical stress field should be considered in construction of a dynamic model for GMA.This work presented a three-dimensional nonlinear dynamic multi-field coupled model of GMA,taking the mass of Terfenol-D rod,pre-stress,biased field,losses of magnetic hysteresis and eddy current into consideration.The loss of magnetic hysteresis was calculated using Jile-Autherton magnetization model.The commercial finite element software FEMLAB was used to implement the presented model.The simulation results coincided with the experimental results,which validated the model.更多还原