A method of fault diagnosis and flight envelop assessment for flight control systems

To improve the controllability of an aircraft in the presence of control surface damage, a method of fault diagnosis and flight envelop assessment is proposed in this paper. Firstly, it is considered that the control surface damage could cause the aerodynamic parameter change, so the damage model is built. Then, based on the recursive least square method, the aerodynamic parameters are identified in online. Finally, based on identification parameters, the online fault diagnosis is processed by remains decision technology, at the same time the flight envelop is assessed accurately. The simulation results show the fault diagnosis and envelop assessment is achieved.