Abstract
Shape Memory Alloy (SMA) actuators have broad application prospects in many fields, but due to the nonlinearity of inherent hysteresis of SMA, the precise position control has become the biggest obstacle for the wide application of SMA actuators in the fields of smart structures. Therefore, research on the control technology of push-pull type SMA actuators is rather important for extending the application of SMA actuators. A thermomechanical hysteresis model of push-pull type SMA actuators based on the one-dimensional constitutive laws developed by Tanaka-Liang et al. is presented. The Fuzzy-PID composite controller and the adaptive Fuzzy-tuned-PID controller are applied to the control of nonlinear hysteresis of push-pull type SMA actuators system. The movement characteristic and the control effect of push-pull type SMA actuators are simulated and the advantages and disadvantages of different controllers are analyzed. The results of simulation and analysis provide theoretical reference for the precise control of push-pull type SMA actuator systems.
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