A Fault Diagnosis Reasoning Method Based On Comprehensive Failure Propagation Model

A fault diagnosis reasoning method based on the comprehensive failure propagation model are proposed for fault diagnosis of complex dynamic systems such as avionics systems. The method considers the logic operation of the fault effects, the divergence and convergence of the propagation path, and the constraints on the propagation time. The method takes alarm events of the system as input, performs logic analysis, time calculation and constraint judgment to generate or update inferences. Inferences are the data structures of the diagnostic process, containing system failure location and, to some extent, fault impact prediction. Through the evaluation of candidate inferences, the most reasonable fault diagnosis inference is provided to user and maintenance personnel. Simulation verification of the proposed method is carried out based on the comprehensive failure propagation model of a typical avionics integrated display system.