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Author: KARAZAITRI, C; KELLER, AZ; FLEMING, PV
Abstract: A methodology combining the benefits of matrix FMEA and the Risk Priority Number (RPN) technique is presented in this paper. The matrix approach is improved to provide an organised and traceable analysis from the piece part failure mode through all indenture levels to system level failure effects. Firstly, a single synthesized matrix capable of modeling an entire system and storing all individual item matrices in a compact and efficient manner is developed. Secondly, the methodology, presented in an earlier paper, based on the probabilistic combination of RPNs is improved further. The RPN methodology is widely used in British and European rail and automotive industries. An RPN is calculated for every cause of failure by multiplying together Severity, Occurrence and Detection ratings (values between 1 and 10). The probabilistic approach is used to calculate Local and Global Priority Indices which reflect the importance of an event relating to the indenture level under consideration and to the entire system respectively. The matrix and the Priority Indices calculations have been incorporated in a computer program implemented on an IBM PC. One of the main features of the program is an interactive and intelligent browsing facility whereby an event can be traced horizontally or vertically from piece parts to system level and vice versa. The browsing facility can be used as a tool for identifying different levels of ambiguity for fault isolation, developing maintenance diagnostic charts and procedures and formulating replacement level criteria. The methodology presented is demonstrated by application to an illustrative example.
Source: PROCEEDINGS ANNUAL RELIABILITY AND MAINTAINABILITY SYMPOSIUM
Publication Year: 1992
Volume:
Issue nr: SYM
Pages: 414 - 421
Science Code: Engineering, Multidisciplinary; Engineering, Industrial
Tags: RAIL AND AUTOMOTIVE INDUSTRY; FMEA; RISK PRIORITY NUMBER; MATRIX FMEA; LOCAL AND GLOBAL PRIORITY INDEXES