基于Preisach模型的磁致伸缩位移传感器迟滞补偿方法

迟滞是磁致伸缩位移传感器测量误差的主要来源之一,减小迟滞可以显著提高传感器的测量精度.根据铁磁材料的磁滞特性分析了位移迟滞的形成过程.针对磁致伸缩位移传感器在短行程中仍存在较大迟滞的问题,将传感器整体视为迟滞系统并通过Preisach模型描述其输入输出关系,然后在此基础上提出了一种软件层面上的迟滞补偿方法,将迟滞曲线分...

A hysteresis compensation method of magnetostrictivedisplacement sensor based on the Preisach model

Hysteresis is one of the main sources of measurement errors for magnetostrictive displacement sensors ( MDS ). Themeasurement accuracy of the sensor can be significantly improved by reducing hysteresis. According to the hysteresis characteristics offerromagnetic materials, the formation process of the displacement hysteresis is analyzed. To address large hysteresis in the short strokeof MDS, the Preisach model is used to describe the input-output relationship of hysteresis system which represents MDS. Then, asoftware compensation method for hysteresis on this basis is proposed, which linearizes the hysteresis curve piecewise to calculate initialiteration value. The search range of convergence value is determined according to the steady-state error. To solve the problem of the largedeviation between the theoretical model and reality within a short distance after the magnetic ring turns, the convergence condition isadjusted near the turning point to improve the accuracy of the compensation method in this area. Experimental results show that themethod requires only a few iterations. After compensation, the hysteresis of MDS is reduced to about 1 / 3 of the original value. Thenonlinearity is also slightly improved. Without changing the existing sensor structure, this method can quickly and effectively reduce thedisplacement hysteresis of the sensor. It provides a new solution for the hysteresis compensation of MDS.