Output feedback control of uncertain nonlinear systems

This paper concerns the nonlinear observer-based control design, which is m ainly based on Fliess(1) linearization and parametrized transformation for uncertain nonlinear processes. The proposed control scheme allows us to adj ust the rate of tracking and the decay of observer error for regulating the system output. Through the valid selection of tuning parameters of the out put feedback controller, the bounded output tracking is achieved and its tu ning scheme is robust against model uncertainties. The effectiveness of our design method is demonstrated by a simulation example of the control of an exothermic CSTR with multiple steady states. Under significant observer-in itialization errors and unstable operating conditions of designs, the satis factory output regulation and disturbance rejection are obtained.