Fault isolation and adaptive reconfiguration design for fault tolerance flight control system

The key technology of fault tolerance control is online fault isolation and reconfiguration. Combined the advantage of multiple models adaptive and optimal control, a method of optimal multiple models adaptive linear quadric regulator-based fault tolerance flight control system is presented. The method is based on multiple identification models and model-follow adaptive techniques. Firstly, according to the failure model of actuator, a series of parallel linear quadric-based identification models are set up for corresponding to each failure, and then the optimal model-follow linear quadric regulator is designed for corresponding to each model. Finally, in the light of the multiple model tuning and control, online fault isolation and reconfiguration is achieved in flight control system. The scheme is illustrated through simulations applying a lateral motion of an aircraft. The simulation results show that an aircraft has good dynamic performance in the presence of control surface failures.