Extended state observer-based adaptive prescribed performance control for a class of nonlinear systems with full-state constraints and uncertainties

In this paper, an extended state observer-based adaptive prescribed performance control technique is proposed for a class of nonlinear systems with full-state constraints and uncertainties. An extraordinary feature is that not only the control problem of prescribed performance tracking and full-state constraints are solved simultaneously, but also the parametric uncertainties and disturbances are considered, which will make it difficult to design a stable controller. For this purpose, the extended state observer and adaptive technique are integrated to obtain estimations of disturbances and parameters. Then, based on the combination of prescribed performance and barrier Lyapunov function, a novel backstepping control scheme is developed with feedforward compensation of parameters and disturbances to ensure that the tracking error is kept within a specified prescribed performance bound without violation of full states at all times. Moreover, the boundedness of all signals in the closed-loop system is proved and asymptotic tracking can be realized if the disturbances are time-invariant. Finally, two simulation examples are performed to highlight the efficiency of the proposed approach.

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