Accession Number:
ADA439786
Title:
Control of Hysteresis: Theory and Experimental Results
Descriptive Note:
Technical rept.
Corporate Author:
MARYLAND UNIV COLLEGE PARK INST FOR SYSTEMS RESEARCH
Personal Author(s):
Report Date:
2001-01-01
Pagination or Media Count:
14.0
Abstract:
Hysteresis in smart materials hinders the wider applicability of such materials in actuators. In this paper, a systematic approach for coping with hysteresis is presented. The method is illustrated through the example of controlling a commercially available magnetostrictive actuator. We utilize the low-dimensional model for the magnetostrictive actuator that was developed in earlier work. For low frequency inputs, the model approximates to a rate-independent hysteresis operator, with current as its input and magnetization as its output. Magnetostrictive strain is proportional to the square of the magnetization. In this paper, we use a classical Preisach operator for the rate-independent hysteresis operator. In this paper, we present the results of experiments conducted on a commercial magnetostrictive actuator, the purpose of which was the control of the displacementstrain output. A constrained least-squares algorithm is employed to identify a discrete approximation to the Preisach measure. We then discuss a nonlinear inversion algorithm for the resulting Preisach operator, based on the theory of strictly-increasing operators. This algorithm yields a control input signal to produce a desired magnetostrictive response. The effectiveness of the inversion scheme is demonstrated via an open-loop trajectory tracking experiment.
Descriptors:
Subject Categories:
- Numerical Mathematics
- Electricity and Magnetism