Adaptive Event-Triggered Output-Feedback Stabilization for a Class of Uncertain Nonlinear Systems With Unknown Control Coefficients

This article investigates the global stabilization problem for a class of nonlinear systems via adaptive event-triggered output-feedback control. The distinguishing feature of the system mainly lies in the unknown control coefficient, the unknown growth rate (UGR) with polynomial-of-output growth (POG), the external disturbances and the unmeasurable states. In order to handle the above uncertainties, a dynamic high-gain and a high-gain-based observer are introduced. Aiming at reducing the computational costs and saving the communication resources, a dynamic event-triggering mechanism (ETM) is provided. An event-triggered controller based on the observer and the dynamic high-gain is designed by the technique of the backstepping and the method of the universal control. It can ensure global boundedness of all the closed-loop system states, and meanwhile, the Zeno behavior is avoided. A practical example is given to illustrate the correctness of the proposed method.