Novel approaches for reprioritization of failures in FMEA

• Main Authors: Wen, Ta-Chun, 温大君
• Other Authors: Chang, Yung-Chia
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/61917783455696008060

博士 === 國立交通大學 === 工業工程與管理學系 === 100 === Most current risk assessment methods use the failure mode and effects analysis (FMEA) approach to evaluate the risk of failure. Traditionally, FMEA uses the risk priority number (RPN) to evaluate the risk of failure. However, the RPN method has the serious problem, loses some message which the experts provide to have the valued message, and not consider the ordered weight. In order to improve the method of RPN evaluation, this study proposes two novel approaches. One is integrating 2-tuple and the ordered weighted averaging (OWA) operator in FMEA, and another is integrating 2-tuple and the linguistic ordered weighted geometric averaging (LOWGA) operator in FMEA. The main purpose of this study is to effectively resolve the main shortcomings of RPN evaluation to assure product and process robustness. Two cases of the Color Super Twisted Nematic (CSTN) product design and manufacturing that has been drawn from a professional LCD manufacturer in Taiwan to further illustrate the proposed approaches. After comparing the results that was obtained from the proposed methods with two other approaches, it was found that the proposed approaches do not lose of useful message provided by the experts. Moreover, the proposed methods provided a more accurate and reasonable ranking of the risk of failure.