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A HYBRID SIMULATION STUDY OF NONLINEAR DECOUPLING CONTROL SYSTEM FOR AIRCRAFT PENETRATION

Chen Yanyang;Sun.Baoting; Hu Zhaofeng(Beijing University of Aeronautics and Astronautics. Dept. of Flight Vehicle Design and Applied Mechanics)  
While an aircraft penetrates at low level by using TF/TA technologies.there appears tohave some nonlinear cross couple between longtudinal and lateral movement.A flight controllaw by combining the nonlinear inverse dynamics theory and the modern optimal control theory can be founded to decouple the coupling motion. This paper mainly deals with the hybridsimulation of this nonlinear decoupling control system. A mathematical model for simulationand the simulation mathod are provided. Some researching results in system's decouplingcontrol of the aircraft flying in atmosphere with and without turbulent disturbance: insystem's capturing the command input and in aircraft flying qualities are presented. The simulation results illustrate that the system can accurately capture the desired three demensionalpenetration trajectary by decoupling control laws and it offers better dynamic characteristicsand flying qualities of the aircraft even encountering the atmosphere disturbance.
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