Continuous PID-SMC based on improved EHGO for robot manipulators with limited state measurements

Abstract This paper focuses on the robust output feedback tracking control for n-DOF (degree-of-freedom) robot manipulators with limited state measurements. An improved extended high-gain observer (EHGO) is designed to estimate the unavailable states as well as the system uncertainty and disturbance. A novel control framework combining the improved EHGO and continuous PID-sliding mode controller (PID-SMC) is proposed. The Lyapunov approach is used to prove the effectiveness of the EHGO. Moreover, the stability and convergence of the closed-loop system are confirmed through the singular perturbation theory. Numerical simulation and experimental results are presented to show the performance of the proposed control scheme.

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