Fuzzy criticality assessment of FMECA for the SADA based on modified FWGM algorithm & centroid deffuzzification

In this paper, the fuzzy assessment information is derived for the eight failure modes and relative importance weights of three risk factors by utilizing the interval number matrix multiplying method. Fuzzy Risk Priority Numbers (FRPNs) are defined as Fuzzy Weighted Geometric Mean (FWGM) of the fuzzy ratings for the three risk factors for prioritization of failure modes, and it can be calculated using α-level sets and benchmark adjustment devised search algorithm rather than liner programming (LP). To facilitate the ranking of failure modes, the FRPNs are derived by virtue of a new centroid defuzzification approach based on α-level sets. The fuzzy FMEA approach mentioned above is then illustrated with an application to the Solar Array Drive Assembly. As is illustrated by the numerical example, the proposed FMEA can well capture FMEA team members´ diversity opinions and prioritize failure modes under different types of uncertainties.