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In this paper, we develop a novel extended state observer (ESO), in terms of tracking error only, for output tracking of a class of multi-input multioutput systems with mismatched uncertainty. A novel ESO is constructed from the nonsmooth function “$\text{fal}$ ” to estimate both uncertainty and state of the system. An ESO-based output feedback controller is then designed to compensate (cancel) the...
In this paper, we investigate the finite-time stabilization of a class of nonlinear systems using output feedback. The system nonlinearities are only assumed to be Holder continuous with output-dependent Hôlder coefficients. A new continuous, finite-time, output-feedback controller design is proposed based on a finite-time observer. The jet engine control model is adopted to demonstrate the effectiveness...
In this paper, the global and semi-global convergence of nonlinear active disturbance rejection control (ADRC) for a class of multi-input multi-output (MIMO) nonlinear systems with large uncertainties that come from both dynamical modeling and external disturbance are proved. A class of linear systems with external disturbance that can be dealt with by ADRC is classified, from which a comparison with...
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