| Summary: | 碩士 === 國立交通大學 === 工業工程與管理學系 === 99 === The risk priority number (RPN) method is commonly applied in the failure mode and effect analysis (FMEA) to assess the importance of failures. RPN is the mathematical product of the three parameters of a failure mode that is rated between 1 to 10 in terms of its severity (S), occurrence (O), and detection (D), respectively. However, the RPN method has been found with the high reduplicated RPN values, unable to consider the ordered weights of SOD and failed to consider the direct and indirect relationships between the failure modes and causes of failure. This study provides a method that combines the technique for order preference by similarity to ideal solution (TOPSIS) and the method of decision making trial and evaluation laboratory (DEMATEL) to prioritize failures in FMEA. TOPSIS is used to decrease the reoccurrence of the RPN values while DEMATEL is applied to explore the direction and indirection relationship in failure modes and causes of failure and rank the most important order of failure mode indeed. In numerical verification, two FMEA cases are presented to illustrate the effectiveness of the proposed approach. Compared with the conventional RPN method and other methods, the proposed method can resolve abovementioned of RPN ranking issues and give a more appropriate risk assessment than other listed approaches to provide valuable information for the decision makers.
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