通过分析超磁致伸缩材料磁畴在外加磁场作用下的运动规律,建立了超磁致伸缩执行器基于磁化机理的磁滞模型.该模型结合执行器的工作条件,充分考虑了材料的非线性和滞回特性.模型包括磁致伸缩和磁化两个子模型,磁致伸缩模型描述了材料应变λ跟磁化强度M之间的关系;磁化模型描述了有效磁场H_(eff)、无磁滞磁化M_(an)、可逆磁化M_(rev)、不可逆磁化M_(irr)、总磁化强度M之间的关系.通过对实验测试结果进行分析,验证了模型能准确描述输入电流I与输出应变λ之间的关系.
Based upon an analysis of the motion law of giant magnetostrictive material magnetic domain under magnetic field, a hysteresis model of magnetization-based for a giant magnetostrictive actuator is established. The model incorporates operating conditions of the actuator and fully considers nonlinear and hysteresis characteristics of the material. It includes two sub-models: magnetostriction and magnetization. The relationship between the strain λ and the magnetization M is illustrated in the magnetostriction model. The magnetization model describes the relationships amongst the effective field H_(eff), the anhysteretic magnetization M_(an), the reversible magnetization M_(rev), the irreversible magnetization M_(irr) and the total magnetization M, The model is proved to be able to describe the relation accurately between the input current I and the output strain λ by analyzing the experimental result.
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