A weight restricted DEA model for FMEA risk prioritization
Garcia, Pauli Adriano de A.; Leal Junior, Ilton Curty; Oliveira, Murilo Alvarenga
http://dx.doi.org/10.1590/S0103-65132012005000092
Prod, vol.23, n3, p.500-507, 2013
Abstract
In this paper we present a linear programming (LP) approach to risk prioritization in failure mode and effects analysis (FMEA). The LP is a data envelopment analysis (DEA)-based model considering weight restriction. In a FMEA, we commonly consider three criteria to prioritize the failure modes, occurrence, severity and detectability. These criteria are in an ordinal scale commonly varying from 1 to 10, higher the figure worse the result. Considering the values established for each criteria, in traditional FMEA one adopts a Risk Priority Number, calculated considering the product of criteria, which has been very criticized due to its shortcoming. Through the proposed approach a frontier is established considering the less critical failure modes. Considering this frontier, one can establish how much each failure mode must be improved to become relatively acceptable. A simplified case concerning an AFWS of a two loops PWR power plant is presented to shows the applicability of the proposed approach.
Keywords
FMEA. Risk priority number. DEA. Weight restriction
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