Self-Tuning Fuzzy Control of a Piezoelectric Actuator System

To reduce the nonlinear hysteresis effect, a self-tuning fuzzy controller is designed for a positioning system. First, the Bouc-Wen model is applied to establish the mathematical model of a piezoelectric plant. Then, a PD-like fuzzy controller is designed to overcome the shortcomings of a traditional PI controller for the piezoelectric actuator system. Moreover, a self-tuning fuzzy controller is proposed to adjust the scaling factor of the PD-like fuzzy controller output. Computer simulation demonstrates the self-tuning fuzzy controller possesses the best robustness against external disturbance.