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Title: AN IMPROVED FMEA METHODOLOGY
Author: KARAZAITRI, C; KELLER, AZ; BARODY, I; FLEMING, PV
Abstract: This paper deals with the application and use of process and design FMEA in the British rail and automotive industries. Guidelines from BS.5760 (Part 3) (Ref. 6), which have wide use in the UK, are reviewed, and associated problem areas discussed. These guidelines are based on Risk Priority Numbers (RPN's) which are calculated for every recorded cause of failure by multiplying severity, occurrence, and detection ratings. A deficiency that exists however in these guidelines is that they do not address themselves to the computation of RPN's for all modes of failure for each item and module of the system of interest to the analyst. A methodology based on probability theory is developed to calculate RPN's for every recorded failure cause. The probabilistic approach presented is extended to calculate Priority Indices for every recorded failure mode (FMPI), component (CPI) and finally for the total system (SPI). In this way, all calculated indices can be systematically compared on a rational basis as they are expressed in terms of a common probabilistic scale. The methodology presented also introduces a new idea of Ordered Matrix FMEA where all qualitative and quantitative information recorded is stored in a pictorial and convenient way. The probabilistic and matrix approaches have been incorporated in a computer program implemented on an IBM PC. The program developed is used to identify efficiently all potential causes of failure. An illustrative example of the use of the above method is given.
Source: PROCEEDINGS ANNUAL RELIABILITY AND MAINTAINABILITY SYMPOSIUM
Publication Year: 1991
Volume:
Issue nr: SYM
Pages: 248 - 252
Science Code: Engineering, Multidisciplinary; Engineering, Industrial
Tags: RAIL AND AUTOMOTIVE INDUSTRY; FMECA; RISK PRIORITY NUMBER; MATRIX FMEA
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