超磁致伸缩换能器的磁滞非线性动力学仿真

在超磁致伸缩材料输出端位移假设的基础上，建立了以输出顶杆为研究对 象、考虑材料内部磁滞非线性及预压弹簧特性的超磁致伸缩换能器非线性动力学模 型; 并将Simulink仿真系统应用到超磁致伸缩换能器系统动力学仿真中. 仿真结果表 明: 换能器模型系统为稳定周期运动系统，并具有滞回非线性特性；弹簧非线性项中的平方 项是影响换能器模型系统的主要因素. 经验证，数值计算结果与文献给出的试验测试结果吻 合较好.

NONLINEAR DYNAMIC CHARACTERISTICS CAUSED BY HYSTERESIS OF THE GIANT MAGNETOSTRICTIVE TRANSDUCER

Based on the assumptions of the output displacement of the giant magnetostrictive material, a nonlinear dynamic model for the giant magnetostrictive transducer is built, in which the output mandril is used as the main parameter and the nonlinear hysteresis inside the giant magnetostrictive material and the prestressed spring characteristics are considered at the same time. The Simulink system is used in the dynamic simulation process of the giant magnetostrictive transducer system. The dynamic simulation results indicate that the transducer system is in a stable period movement with non-linear hysteresis characteristics. The numerical results obtained in this paper agree well with the experiment results in literature. The results also show that the square term in the relation for the nonlinear spring is the main factor that influences the transducer system model.