Evaluating the risk of failure using the fuzzy OWA and DEMATEL method

Authors:
Kuei-Hu Chang;Ching-Hsue Cheng
Affiliations:
Department of Management Sciences, R.O.C. Military Academy, Kaohsiung, Taiwan 830;Department of Information Management, National Yunlin University of Science and Technology, Yunlin, Taiwan 640
Venue:
Journal of Intelligent Manufacturing
Year:
2011

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Abstract

Most current risk assessment methods use the risk priority number (RPN) value to evaluate the risk of failure. However, traditional RPN methodology has been criticized to have several shortcomings. Therefore, an efficient, simplified algorithm to evaluate the orderings of risk for failure problems is proposed in this paper, which utilizes fuzzy ordered weighted averaging (OWA) and the decision making trial and evaluation laboratory (DEMATEL) approach to rank the risk of failure. The proposed approach resolves some of the shortcomings of the traditional RPN method. In numerical verification, a failure mode and effects analysis (FMEA) of the thin film transistor liquid crystal display (TFT-LCD) product is presented to further illustrate the proposed approach. The results show that the proposed approach can reduce duplicated RPN numbers and get a more accurate, reasonable risk assessment. As a result, the stability of product and process can be assured.