基于Preisach磁滞理论的超磁致伸缩驱动器建模

Modeling of Giant Magnetostrictive Actuator Based on Preisach Theory

超磁致伸缩驱动器具有响应快、输出应变大、机电转化效率高等优点,但因受超磁致伸缩材料内在的磁滞效应与磁-机耦合效应等因素影响,导致其输出位移存在较大滞环,大大降低了驱动器的输出位移精度,也影响了该材料及其致动器更广泛的应用。为了有效地设计和使用超磁致伸缩驱动器,需要建立准确描述其磁滞非线性的数学模型。在经典Preisach模型的基础上建立了超磁致伸缩驱动器的Preisach磁滞数值模型,并通过对Preisach限制三角形的离散划分,依赖大量实验数据辨识了该模型的参数,并进行了超磁致伸缩驱动器磁滞输出实验研究。实验结果表明:该Preisach磁滞模型能较好地描述准静态下超磁致伸缩驱动器的磁滞现象,对指导超磁致伸缩驱动器位移精度的提高具有一定意义。

The giant magnetostrictive actuator （GMA） has some advantages, such as fast response, large magnetostrictive strain, high eleetromeehanical transformation efficiency and so on. However, the GMA exhibites nonlinear characteristics of magneticelastic coupling and frequency-dependent hysteresis, which severely hinders the accuracy of GMA＇ s output displacement as well as its further applications. In order to design and use the GMA effectively, a suitable hysteresis nonlinearity model should be established. A Preisach-based numerical model for describing the nolinear hysteresis of GMA was derived on the study of the classic Preisach model, and the Preisaeh restrict plane was discretized into Levels uniformly, and a lot Of experiment data were carried to identify the parameters of Preisach-based numerical model. The results reveal that the hysteresis nolinear model can well describe the practical situation. It has guiding significance for improving the positioning precision of GMA.