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Output feedback stabilization of systems with non-linear actuators

An output feedback controller is developed to provide stabilization for feedback-linearizable systems with asymptotically-stable non-linear actuators. The controller consists of a globally-bounded state feedback and a high-gain observer. It is established that if the actuator dynamics are sufficiently fast, then the developed output feedback controller will stabilize the origin of the closed-loop system regardless of how fast the observer is. A simulation example is included to illustrate the developed theory.