FMEA에서 고장 심각도의 탐지시간에 따른 위험성 평가 = Risk Evaluation in FMEA when the Failure Severity Depends on the Detection Time

다국어 초록 (Multilingual Abstract)

The FMEA is a widely used technique to pre-evaluate and avoid risks due to potential failures for developing an improved design. The conventional FMEA does not consider the possible time gap between occurrence and detection of failure cause. When a failure cause is detected and corrected before the failure itself occurs, there will be no other effect except the correction cost. But, if its cause is detected after the failure actually occurs, its effects will become more severe depending on the duration of the uncorrected failure. Taking this situation into account, a risk metric is developed as an alternative to the RPN of the conventional FMEA. The severity of a failure effect is first modeled as linear and quadratic severity functions of undetected failure time duration. Assuming exponential probability distribution for occurrence and detection time of failures and causes, the expected severity is derived for each failure cause. A new risk metric REM is defined as the product of a failure cause occurrence rate and the expected severity of its corresponding failure. A numerical example and some discussions are provided for illustration.

참고문헌 (Reference)

1 S. J. Rhee, "Using cost based FMEA to enhance reliability and serviceability" 17 : 179-188, 2003

2 M. Abdelgawad, "Risk management in the construction industry using combined Fuzzy FMEA and Fuzzy AHP" 136 : 1028-1036, 2010

3 H. Liu, "Risk evaluation approaches in failure mode and effects analysis : A literature review" 40 : 828-838, 2013

4 권혁무, "Risk Evaluation Based on the Time Dependent Expected Loss Model in FMEA" 한국안전학회 26 (26): 104-110, 2011

5 H. Zhang, "Model-based functional safety analysis method for automotive embedded system application" Dalian 13-15, 2010

6 M. Kumru, "Fuzzy FMEA application to improve purchasing process in a public hospital" 13 (13): 721-733, 2013

7 H. C. Liu, "Failure mode and effects analysis using intuitionistic fuzzy hybrid weighted Euclidean distance operator" 45 (45): 2012-2030, 2014

8 H. C. Liu, "Failure mode and effects analysis using D numbers and grey relational projection method" 41 : 4670-4679, 2014

9 Ford Design Institute, "FMEA HANDBOOK, VERSION 4.1"

10 H. C. Liu, "Evaluating the risk of failure modes with extended MULTIMOORA method under fuzzy environment" 34 : 168-177, 2014

11 권혁무, "An Expected Loss Model for FMEA under Periodic Monitoring of Failure Causes" 대한산업공학회 39 (39): 143-148, 2013

12 백명식, "ASIL에 기초하여 수정된 안전시스템 FMEA 위험평가척도" 한국품질경영학회 42 (42): 543-562, 2014