文档介绍：
Multi-hierarchical Functional Directed Graph Modeling
Method for Aircraft System Fault Diagnosis#
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SU Yan, LIU Pengpeng*
(College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, 210016)
Abstract: In order to e the ings or insufficiency of analysis methods individually
based on graph theory or quantitative analysis method, semi-quantitative fault diagnosis method based
on graph theory and fuzzy bined with functional fault analysis (FFA) theories and Failure
Mode and Effects Analysis(FMEA) is studied. And a multi-hierarchical functional directed graph
modeling method is proposed for aircraft system fault diagnosis. Nacelle Anti-Ice subsystem of an aero
engine is taken as a specific application to present the detailed MHFDG modeling method.
Key words: System modeling; Aircraft system; Fault diagnosis; Graph theory; Function Fault Analysis
0 Introduction
Hybrid system is a class plex system which has continuous dynamic characteristic,
discrete dynamics characteristic, or the interaction of above two dynamic characteristics. In
real world, plex systems have above mixed characteristics and are hybrid systems[1].
Among the positions of hybrid systems, there are some qualitative, quantitative or
logical relationships which depend on the system structure, function and behavior[2]. Analysis
method based on graph th