Abstract
Based on the uncertaintyproblem of decision factors in the fault diagnosis and maintenance ofequipment, the fuzzy method and grey theory were introduced. Firstly, fuzzyterms were applied to describe the basic variables (probability of occurrence,severity and detection). Triangular fuzzy number was selected to carry out thequantitative calculation of fuzzy terms and the defuzzification of membershipfunctions. Then the grey correlations of all Failure modes were computed andrisks were ranked, considering the relative importance of decision factors. Thefuel system of marine diesel engine was taken as an example. It is pointed thatalthough the risk priority numbers are equal, if the values or weights ofdecision factors are different, then the risk levels of Failure modes aredifferent as well. The results indicate that the calculation model can identifythe failures of ship equipment more precisely and optimize allocation ofmaintenance resources.
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