Fixed-Time Adaptive Fuzzy Tracking Control for Longitudinal Dynamic Model of Hypersonic Vehicles with Nonlinear Parametrization

This paper studies an adaptive fixed-time output tracking control problem for nonlinearly parametrized hypersonic vehicles. To deal with unknown nonlinearly parametrized dynamics, fuzzy logic systems (FLSs) are used to approximate these nonlinear terms. An adaptive fuzzy control scheme is developed by using a backstepping control method, which ensures that the closed-loop signals are globally ultimately bounded and the tracking errors converge into a small neighborhood of origin within fixed time. Simulation results demonstrate the effectiveness of the proposed control scheme.