Robust Adaptive Control for Non-minimum Phase Flexible Air-breathing Hypersonic Vehicles

In this paper, a robust adaptive control scheme is developed for flexible air-breathing hypersonic vehicles (FAHVs) with uncertain parameters and non-minimum phase characteristic. Firstly, the input-output dynamics and internal dynamics of this model are derived. Considering the complicated practical flying environment, a parametric dynamic model of FHAVs is constructed. Then, the ideal internal dynamics(IID), resulting from the non-minimum phase property, are estimated asymptotically via improved system center method. Combined with the sliding mode control theory, a nominal controller is first developed for the nominal FAHVs model. Robust adaptive laws are proposed to update the unknown system parameters. Finally, simulation results demonstrate the effectiveness of the proposed control method.