Wen-Fang Xie

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—In this paper, a novel sliding-mode-observer-based adaptive controller is developed for the servo actuators with friction. The LuGre dynamic friction model is adopted for adaptive friction compensation. A sliding-mode observer is proposed to estimate the internal friction state of LuGre model. Based on the estimated friction state, adaptation laws are(More)
— Smart actuators such as magnetorestrictive actuators, shape memory alloy (SMA) actuators, and piezoceramic actuators exhibit different hysteresis loops. In this paper, a generalized Prandtl-Ishlinskii model is utilized for modeling and compensation of hysteresis nonlinearities in smart actuators. In the formulated model, a generalized play operator(More)
In this paper, a sliding mode control algorithm is developed to synthesize nonlinear control system for aircraft systems with actuator faults. Two design parameters are used to deal with uncertainty caused by actuator faults and uncertainty in system dynamics separately. An adaptive algorithm is developed to accomodate these uncertainties without knowing(More)