Event-triggered practical finite-time output feedback stabilization of a class of uncertain nonlinear systems

This paper studies the event-triggered practical finite-time output feedback stabilization problem for a class of uncertain nonlinear systems with unknown control gains. First, a reduced-dimensional observer is employed to implement the reconstruction of the unavailable states. Furthermore, a novel event-triggered output feedback control strategy is proposed based on the idea of backstepping design and sign function techniques. It is shown that the practical finite-time stability of the closed-loop systems is ensured by Lyapunov analysis and related stability criterion. Compared with the existing methods, the main advantage of this strategy is that the observer errors and event-trigger errors can be processed simultaneously to achieve the practical finite-time stability. Finally, an example is adopted to demonstrate the validity of the proposed scheme.