Abstract:

As the flight envelop of near-space vehicle (NSV) is extremely large, the system may have strong nonlinearity and fast time-variability, especially when the velocity is hypersonic. Meanwhile, because of the airframe/engine integrated design, the aerodynamic and the propulsion have strong coupling. Both are big challenges for the controller design. Considering the flight task of NSV, the aerodynamic model and the engine system are analyzed first. Then the integrated aerodynamic/engine control model for hypersonic longitudinal motion of NSV is also studied and transformed into an affine nonlinear system using the inputoutput feedback linearization method. After that, for a class of uncertain nonlinear systems, a GPC (generalized predictive control) strategy based on sliding-mode surface is derived and an adaptive law is proposed to eliminate the systems’ uncertainty using the universal approximation of T-S fuzzy system, then the control character of this method is analyzed via Lyapunov method. Finally, this strategy is used as an integrated flight/propulsion control law for the longitudinal motion of NSV, and the result of simulation experiment shows the effectiveness of fuzzy adaptive GPC.