Precise position control of giant magnetostrictive smart structures with stress-depedent hysteresis

Giant Magnetostrictive Actuator (GMA) has been used in Giant Magnetostrictive Smart Structures (GMSS) for precise position, active vibration control with characteristics of high force and large displacement. Hysteresis nonlinearity is main drawback of GMA, which causes undesirable inaccuracies, oscillations, even instability to systems and restricts its potential application. Specially, Stress-Dependent hysteresis is encountered in Giant Magnetostrictive Actuator (GMA), which means that the hysteresis nonlinearity of GMA depends on the stress applied on GMA. A control scheme consists of an adaptive inverse control based on Stress-Dependent Prandtl-Ishlinskii (SDPI) hysteresis model and a Single Neuron PID control for precise position of GMSS with Stress-Dependent Hysteresis. Simulation results show the scheme extremely improves the dynamic quality of GMSS.