Abstract: A simplified robust adaptive fuzzy dynamic surface control approach is presented for a general class of strictblockfeedback uncertain nonlinear systems whose uncertainties and disturbances are approximated on line by T-S fuzzy systems. The adjusting mechanism of adaptive parameters is simplified to avoid the determination of too many parameters. All signals in the closed-loop system are proved to be semiglobally uniformly ultimately bounded by the Lyapunov method combined with the small gain approach. As a result, the controller designed by this approach has lower complexity and minimum adaptive parameters to be tuned on line. Herbst maneuver simulation results for a fighter with thrust vector demonstrate the effectiveness and robustness of the proposed control scheme.

Key words: flight control, backstepping approach, dynamic surface control, T-S fuzzy system, small gain approach