Output-Feedback Controller Based Projective Lag-Synchronization of Uncertain Chaotic Systems in the Presence of Input Nonlinearities

Abstract EN

This paper solves the problem of projective lag-synchronization based on output-feedback control for chaotic drive-response systems with input dead-zone and sector nonlinearities.

This class of the drive-response systems is assumed in Brunovsky form but with unavailable states and unknown dynamics.

To effectively deal with both dead-zone and sector nonlinearities, the proposed controller is designed in a variable-structure framework.

To online learn the uncertain dynamics, adaptive fuzzy systems are used.

And to estimate the unavailable states, a simple synchronization error is constructed.

To prove the stability of the overall closed-loop system (controller, observer, and drive-response system) and to design the adaptation laws, a Lyapunov theory and strictly positive real (SPR) approach are exploited.

Finally, three academic examples are given to show the effectiveness of this proposed lag-synchronization scheme.