超磁致伸缩驱动器磁滞非线性数值模拟研究∗

摘要

Aiming at the phenomenon on the hysteresis nonlinearity of giant magnetostrictive actuator (GMA), based on the classical Jiles-Atherton model,a hysteresis nonlinear model is establised containing bias magnetic field intensity and preloading stress of GMA.The law of GMA magnetization curves and magnetostrictive strain curves are obtained respectively about bias magnetic field intensity and preloading stress by numerical simula-tion analysis.Analysis results show that magnetization curve and magnetostrictive strain curve are influenced greatly by the bias magnetic field intensity at shape,and that the linear range of the magnetization curve can be changed and the frequency doubling effect of magnetostrictive strain curve can be restrained or eliminated by ad-j usting the size of the bias magnetic field intensity,and that the magnetization curve and magnetostrictive strain curve shape are affected by preloading stress,and that with the increase of preloading stress,the rate of change of magnetization curve and magnetostrictive strain curve are increasing and the amplitude were reduced slowly. The hysteresis nonlinearity model is reasonable beacuse these conclusions are consistent with the experiments.%针对超磁致伸缩驱动器(giant magnetostrictive actuator,GMA)具有磁滞非线性现象,以经典 Jiles-Atherton模型为基础,建立了包含偏置磁场强度和预压应力的 GMA 磁滞非线性模型,进行了数值仿真分析,得到了偏置磁场强度和预压应力对 GMA 磁化强度曲线和磁致伸缩应变曲线的影响规律。结果表明,偏置磁场强度对磁化强度曲线和磁致伸缩应变曲线的形状影响较大,调整偏置磁场强度的大小,可改变磁化强度曲线的线性区间,并能抑制或消除磁致伸缩应变曲线的倍频效应；预压应力对磁化强度曲线和磁致伸缩应变曲线的形状影响较小,施加不同的预压应力,可改变磁化强度曲线和磁致伸缩应变曲线的变化率。这与现有试验得到的结论相吻合,验证了所建磁滞非线性模型的合理性。