Remaining Useful Life Prediction of Aircraft Flap Control System with Mode Transition

Abstract

Hybrid system is a dynamic system with mode transition, and the degradation behavior of its components is varied with different operating modes. However, the recent prognosis methodologies treat the degradation of different operating modes as the same and ignore their differences or even do not consider degradation in idle mode. These methods have a significant error on remaining useful life (RUL) prediction of aircraft flap control system, which is a typical hybrid system and also vital for flight safety. In response to this problem, this paper proposes a method based on bond graph, which integrates the mode transition information into global analytical redundancy relations. Here, the mode-dependent fault signature matrix is constructed and different degradation models are identified. Finally, simulation experiments are done, and the RUL prediction value of the proposed method is closer to the preset value than that of the method without considering degradation of the idle mode.