Research On Adaptive Control Of Near Space Morphing Vehicle

Near-space morphing vehicle(NMV)can flight in the near space,which can improve their performance by morphing the wings' configuration to meet the mission requirements.Consequently,the research on the NMV becomes the key point and a hotspot in the field of aeronautics and astronautics as well as the control technology.However,the NMV possesses the characteristics of rapid time-variation,strong nonlinearity,strong coupling,and model uncertainty.Additionally,there are problems of mode switching in the process of changing wings' configuration.Hence,the research on the flight control system of the NMV is a challenging work.In this paper,firstly,combining with the domestic and abroad research data of the NMV,a nonlinear model of the NMV is established,and the state space expression of the NMV is also obtained.Moreover,the change of the vehicle aerodynamic parameters caused by the winglet telescopic is analyzed,which lays the foundation for the research of flight control system.Secondly,considering the parameters uncertainty of the NMV,the state tracking adaptive control method is used to deal with the problem of uncertainty.The adaptive controller is designed using linear state space model.The stability of the adaptive control method is proved theoretically,and simulation results show that the adaptive controller is effective.Thirdly,considering that output tracking adaptive control method has simpler matching condition and stronger robustness to uncertain parameters,so the output tracking adaptive controller is designed.The stability of the output tracking adaptive control method and the boundedness of the adaptive law are theoretically proved.The simulation results show that the proposed method has good control effect and robustness under the parameter uncertainty.Finally,an uncertain linear model with winglets is established.Aiming at the NMV's winglet telescopic mode switching process,the adaptive winglets switching controller based on matrix factorization is designed to realize the smooth switching between different modes.The stability of the winglets switching process is proved theoretically,and the simulation results show that this method has a good control effect and robustness.The research results of this paper provide an advanced design idea and an effective design method for the design of the flight control system of the NMV,especially the mode switching control.