A New Approach For Prioritization Of Failure Modes In Design Fmea Using Anova

Sellappan Narayanagounder · Karuppusami Gurusami

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Risk and Safety Analysis Reliability and Maintenance Optimization Management Systems and Quality Improvement

Abstract

The traditional Failure Mode and Effects Analysis (FMEA) uses Risk Priority Number (RPN) to evaluate the risk level of a component or process. The RPN index is determined by calculating the product of severity, occurrence and detection indexes. The most critically debated disadvantage of this approach is that various sets of these three indexes may produce an identical value of RPN. This research paper seeks to address the drawbacks in traditional FMEA and to propose a new approach to overcome these shortcomings. The Risk Priority Code (RPC) is used to prioritize failure modes, when two or more failure modes have the same RPN. A new method is proposed to prioritize failure modes, when there is a disagreement in ranking scale for severity, occurrence and detection. An Analysis of Variance (ANOVA) is used to compare means of RPN values. SPSS (Statistical Package for the Social Sciences) statistical analysis package is used to analyze the data. The results presented are based on two case studies. It is found that the proposed new methodology/approach resolves the limitations of traditional FMEA approach.

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References

2007Risk evaluation in failure mode and effects analysis using fuzzy weighted geometric mean 2003Modified failure mode and effects analysis using approximate reasoning 2005Reprioritization of failures in a system failure mode and effects analysis by decision making trial and evaluation laboratory technique 2001Modified approach for prioritization of failures in a system failure mode and effects analysis 2001A new approach for evaluation of risk priorities of failure modes in FMEA 1996Knowledge-based support of system analysis for the analysis of Failure modes and effects

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