Nonlinear compensation of quadratic behavior in a magnetostrictor material

Christopher Howells; Douglas K. Lindner; Huiyu Zhu; Daniel J. Stilwell

doi:10.1117/12.599869

19 May 2005 Nonlinear compensation of quadratic behavior in a magnetostrictor material

Christopher Howells, Douglas K. Lindner, Huiyu Zhu, Daniel J. Stilwell

Proceedings Volume 5757, Smart Structures and Materials 2005: Modeling, Signal Processing, and Control; (2005) https://doi.org/10.1117/12.599869
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

The constitutive behavior of magnetostrictive materials exhibits many nonlinearities. One of the dominate nonlinearities is the quadratic dependence between the drive current and the transducer displacement. While the transducer can be operated at low drive levels with little distortion, at high drive levels the square law distortion is evident. In this paper we propose a nonlinear feedback loop for the drive amplifier such that the amplifier provides a compensation for this transducer nonlinearity. Thus the combination of the amplifier and the magnetostrictive transducer presents a linear input output relationship to the user. The effectiveness of this nonlinear control is demonstrated in simulation.

Citation Download Citation

Christopher Howells, Douglas K. Lindner, Huiyu Zhu, and Daniel J. Stilwell "Nonlinear compensation of quadratic behavior in a magnetostrictor material", Proc. SPIE 5757, Smart Structures and Materials 2005: Modeling, Signal Processing, and Control, (19 May 2005); https://doi.org/10.1117/12.599869

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