Abstract. The actuating precision of a micro-positioning system,
driven by a magnetostrictive actuator, is adversely limited by its
nonlinearities, particularly the output-input hysteresis, which are further
affected by the operating load and input frequency. In this paper, the
output-input properties of a magnetostrictive actuated system are
experimentally characterized considering a wide range of operating
frequencies and loads. The measured data revealed that the hysteresis
behaviour is strongly affected with a change of operating load, and a
modified Prandtl-Ishlinskii model with load-dependent delay is subsequently
formulated to describe the nonlinear characteristics of the magnetostrictive
actuated system in terms of major and minor loop hysteresis, and output
magnitude and phase responses. The proposed model integrates a load-delay
function related to the load mass with the Prandtl-Ishlinskii hysteresis
model so as to fully describe the coupled nonlinear delay effects of the
system output. The validity of the proposed model is demonstrated through
comparisons with the experimental data for a range of operating loads and
frequencies. It is shown that the proposed model can accurately describe the
load-dependent hysteresis effects of the magnetostrictive actuated system up
to certain input frequencies.
Stress-Dependent Hysteresis Modeling and Tracking Control of Giant Magnetostrictive Actuator for Periodic Reference Input