Research on Hammerstein Modeling of a Giant Magnetostrictive Actuator

The giant magnetostrictive actuator (GMA) is an intelligent actuator that utilizes magnetostrictive material as its core, renowned for its exceptional performance, making it extensively employed across various industries. Therefore, the modeling of hysteresis nonlinearity has been the focus of this field. The asymmetric PrandtI-Ishlinskii (PI) model, based on the Hammerstein structure, is employed to represent the nonlinear links within the system. Additionally, for capturing dynamic links in the Hammerstein structure, particularly those associated with high frequency signals, a second-order transfer function is utilized. Determine the model coefficients using the system toolbox. Finally, the developed dynamic rate-dependent hysteresis model is validated by an experimental platform. It is concluded that the asymmetric PI model with Hammerstein structure has higher accuracy, especially for larger frequency excitation signals.