Fuzzy Adaptive Antidisturbance Control Method for a Class of Lateral Thrust–Aerodynamic Force Composite Hypersonic Flight Vehicles

Abstract

This paper investigates the problem of lateral thrust–aerodynamic force composite control for a class of hypersonic flight vehicles (HFVs) suffering from time-varying actuator failures and associated multisource uncertainty. The dynamic characteristics of the lateral thrust–aerodynamic force composite control system are mathematically transformed into a nonlinear strict-feedback system with matched and mismatched uncertainties. First, since the control gain functions and their boundaries are unknown for each subsystem, the hyperbolic tangent function is introduced to estimate the boundary of the lumped disturbance containing time-varying multisource uncertainties. Second, fuzzy logic systems and corresponding adaptive weight update laws are introduced to compensate the unknown nonlinearities within the system. Furthermore, the reciprocal adaptive laws are designed to mitigate the undesirable effects caused by the unknown time-varying control gain functions. Subsequently, an optimal allocation method is employed to allocate the control inputs to the rudder surfaces of the HFV and optimal control effects are achieved. Finally, the effectiveness and superiority of the proposed method are verified by numerical simulations.