A diagnosis method for aeroengine's wear fault based on extension relevancy function

By reserching the causes and forms of aeroengine's wear faults, the relation aeroengine's wear fault messages and extension theory were discovered. Extension set theory was applied to research the aeroengine's wear faults from the qualitative and quantitative aspect. An extension diagnosis method which can judge the type and degree of aeroengine's wear fault was established in the same time. The practical of this diagnosis method were validated by making the metal elements in aeroengine's oil as the character parameters of wear fault.