Abstract
This paper presents a comprehensive modeling and control approach for the piezoelectric fast steering mirror (PFSM) to improve motion accuracy in the presence of hysteresis effects. First, a novel Hammerstein model that cascades a pseudo-discrete-time Bouc-Wen (PDTBW) model with linear dynamics (HPDTBWLD) is proposed to model the PFSM system. It is proved that the proposed HPDTBWLD model can be decoupled by pseudorandom binary sequence (PRBS) signal. A three-step data-driven decoupling identification algorithm is detailed. Following that, a composite robust control strategy is proposed by integrating the inverse PDTBW compensator, a disturbance observer (DOB), and a second-order discrete-time terminal sliding mode controller (2-DTSMC). Finally, the decoupling identification and composite control techniques are implemented on a real-time PFSM experimental platform. Comparative results indicate that the proposed control technique is superior to the 2-DTSMC and PI algorithms in terms of tracking accuracy.
Published Version
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