Hysteresis In Magnetostrictive Actuator Research Articles

Intelligent Modeling for Rate-Dependent Hysteresis Nonlinearity in Magnetostrictive Actuator

Rate-dependent hysteresis existing in the magnetostrictive actuator usually causes undesirable inaccuracies or oscillations and even instability of the controlled system. So an intelligent modeling method, which is based on modified online least squares support vector machines (MOLS-SVM), is proposed in this paper to describe the rate-dependent hysteresis in magnetostrictive actuator. The model is fast and does not require tremendous computational efforts. The data measured in the experiment are used for modeling. The results obtained by using the proposed model are in good agreement with experimental results.

Modeling and control of hysteresis in magnetostrictive actuators

A novel dynamic model is proposed for the hysteresis in magnetostrictive actuators by coupling a Preisach operator to an ordinary differential equation, and a parameter identification method is described. An efficient inversion algorithm for a class of Preisach operators with piecewise uniform density functions is then introduced, based upon which an inverse control scheme for the dynamic hysteresis model is presented. Finally the inversion error is quantified and l 1 control theory is applied to improve the robustness of inverse compensation. Simulation and experimental results based on a Terfenol-D actuator are provided.