Experimental Characterization and Modeling of Dynamic Hysteresis for Magnetostrictive Actuator

In this article, we present the novel approaches of characterizing and modeling the dynamic hystereses for magnetostrictive actuator. The output vs. input loops of the actuator exhibit dynamic hystereses with the different frequencies and amplitudes of sinusoidal currents. Experimental characterization of the dynamic hysteresis of the magnetostrictive actuator is conducted. Three indexes are quantitatively defined, i.e., loop relative width, loop asymmetry degree, and output nonlinearity degree. The polynomial-modified Prandtl-Ishlinskii (PMPI) and adaptive infinite impulse response (IIR) integrated modeling approach is proposed to perform the dynamic hysteresis identification. Therein, the PMPI model is utilized to describe the hysteresis, while the dynamics is modeled via the IIR model. The parameters of PMPI and IIR model are acquired by the data-fitting and recursive least squares (RLS) algorithm respectively. Experimental characterization results show that the magnetostrictive dynamic hysteresis possesses strong nonlinear and asymmetry. Comparison of theoretical modeling and measurement results demonstrates that the PMPI and adaptive IIR integrated model is effective to describe dynamic hysteresis of the magneostrictive actuator.