Journal of Korean Society for Quality Management (품질경영학회지)

Korean Society for Quality Management (한국품질경영학회)
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Risk Evaluation Based on the Hierarchical Time Delay Model in FMEA

FMEA에서 계층적 시간 지연 모형에 근거한 위험평가

  • Jang, Hyeon Ae (Busan Innovation Center for Quality) ;
  • Lee, Min Koo (Department of Information and Statistics, Chungnam National University) ;
  • Hong, Sung Hoon (Department of Industrial and Information Systems Engineering, Chonbuk National University) ;
  • Kwon, Hyuck Moo (Division of Systems Management and Engineering, Pukyong National University)
  • 장현애 (부산품질혁신센터) ;
  • 이민구 (충남대학교 정보통계학과) ;
  • 홍성훈 (전북대학교 산업정보시스템공학과) ;
  • 권혁무 (부경대학교 시스템경영공학부)
  • Received : 2016.03.18
  • Accepted : 2016.05.02
  • Published : 2016.06.30
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Abstract

Purpose: This paper suggests a hierarchical time delay model to evaluate failure risks in FMEA(failure modes and effects analysis). In place of the conventional RPN(risk priority number), a more reasonable and objective risk metric is proposed under hierarchical failure cause structure considering time delay between a failure mode and its causes. Methods: The structure of failure modes and their corresponding causes are analyzed together with the time gaps between occurrences of causes and failures. Assuming the severity of a failure depends on the length of the delayed time for corrective action, a severity model is developed. Using the expected severity, a risk priority metric is defined. Results: For linear and quadratic types of severity, nice forms of expected severity are derived and a meaningful metric for risk evaluation is defined. Conclusion: The suggested REM(risk evaluation metric) provides a more reasonable and objective risk measure than the conventional RPN for FMEA.

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References

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