On nonlinear control design for autonomous chaotic systems of integer and fractional orders

In this paper; we address the problem of chaos control for autonomous nonlinear chaotic systems. We use the recursive "backstepping" method of nonlinear control design to derive the nonlinear controllers. The controller effect is to stabilize the output chaotic trajectory by driving it to the nearest equilibrium, point in the basin of attraction. We study two nonlinear chaotic systems: an electronic chaotic oscillator model, and a mechanical chaotic "jerk" model. We demonstrate the robustness of the derived controllers against system order reduction arising from the use of fractional integrators in the system models. Our results are validated via nume ical simulations. (C) 2003 Elsevier- Science Ltd. All rights reserved.