Combined Longitudinal and Lateral/Directional Maneuvers of a Generic F-16A Using Multiple-Time-Scale Control
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2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All right reserved. This paper develops a slow state tracking nonlinear control law for a nonlinear six-degree-of-freedom aircraft commanded to perform a large-amplitude combined longitudinal and lateral/directional maneuver. Controller development is based on the slow and fast dynamics of aircraft states, and the slow and fast actuator dynamics. The control law is designed using the sequential approach over four different time-scales: one time-scale each for the slow states, slow actuator, fast states and fast actuators. The slow states to be tracked are chosen in a way that helps avoid the coupling between the manifold of the fast states and that of the slow actuator in the slowest time-scale. The design ensures Lyapunov stability of the reduced subsystems. The selection of controller gains dictates the rate at which the tracking error for each commanded slow state goes to zero, and the rates at which the slow actuator, fast states and fast actuators go to their respective manifolds. Results presented in the paper for a generic nonlinear F-16A commanded to perform combined turning and pitching maneuvers demonstrate that the approach enables throttle to be effectively used as a slow control that modulates velocity. All of the other commanded states are tracked well, and all states and controls remain bounded within control position limits.
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2018 AIAA Guidance, Navigation, and Control Conference
