磁致伸缩作动器的电-磁-机耦合动力特性

Dynamic Characteristics of Electro-Magneto-Mechanical Coupling for Magnetostrictive Actuators

基于磁致伸缩材料的本构关系模型,结合磁致伸缩作动器结构动力学模型建立了可描述磁致伸缩作动器的电-磁-机耦合动力特性的运动方程。方程中考虑了作动器工作时磁致伸缩材料的弹性模量随着应力和磁场的改变而发生的变化,磁致伸缩材料的这种特性使得作动器系统表现出具有时变刚度的参数振动特性。通过对此参数振动方程进行数值求解,得到磁致伸缩作动器的参数频响特性,并研究了激励电流幅值以及作动器负载质量对作动器频响特性的影响。

Based on the nonlinear constructive model for magnetostrictive materials and combined with the structure dynamic model of magnetostrictive actuator, a dynamic equation is established to describe the dynamic characteristics of electro-magneto-mechanical coupling for magnetostrictive actuators, where the change of Young’s modulus of magnetostrictive materials with the magnetic field and the stress level in the operating actuators is considered. The property of nonlinear parametric vibration with time-variant stiffness is presented in the dynamic characteristic of magnetostrictive actuators. By virtue of the numerical solution of the equation, the parametric frequency response characteristics of magnetostrictive actuators are obtained. Simultaneously, the effect of the amplitude of drive current and load mass on the dynamic characteristics of magnetostrictive actuators are investigated.