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Proceedings Paper

Nonlinear compensation of quadratic behavior in a magnetostrictor material
Author(s): Christopher Howells; Douglas K. Lindner; Huiyu Zhu; Daniel J. Stilwell
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Paper 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.

Paper Details

Date Published: 19 May 2005
PDF: 9 pages
Proc. SPIE 5757, Smart Structures and Materials 2005: Modeling, Signal Processing, and Control, (19 May 2005); doi: 10.1117/12.599869
Show Author Affiliations
Christopher Howells, Virginia Tech (United States)
Douglas K. Lindner, Virginia Tech (United States)
Huiyu Zhu, Virginia Tech (United States)
Daniel J. Stilwell, Virginia Tech (United States)

Published in SPIE Proceedings Vol. 5757:
Smart Structures and Materials 2005: Modeling, Signal Processing, and Control
Ralph C. Smith, Editor(s)

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