Risk evaluation in failure mode and effects analysis with extended VIKOR method under fuzzy environment

  • Authors:

  • Hu-Chen Liu;Long Liu;Nan Liu;Ling-Xiang Mao

  • Affiliations:

  • Department of Industrial Engineering and Management, Tokyo Institute of Technology, Tokyo 152-8552, Japan;College of Design and Innovation, Tongji University, Shanghai 200092, PR China;School of Management, Chongqing Jiaotong University, Chongqing 400074, PR China;School of Information Management, Nanjing University, Nanjing 210093, PR China

  • Venue:
  • Expert Systems with Applications: An International Journal
  • Year:
  • 2012

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Abstract

Failure mode and effects analysis (FMEA) is a widely used risk assessment tool for defining, identifying, and eliminating potential failures or problems in products, process, designs, and services. In traditional FMEA, the risk priorities of failure modes are determined by using risk priority numbers (RPNs), which can be obtained by multiplying the scores of risk factors like occurrence (O), severity (S), and detection (D). However, the crisp RPN method has been criticized to have several deficiencies. In this paper, linguistic variables, expressed in trapezoidal or triangular fuzzy numbers, are used to assess the ratings and weights for the risk factors O, S, and D. For selecting the most serious failure modes, the extended VIKOR method is used to determine risk priorities of the failure modes that have been identified. As a result, a fuzzy FMEA based on fuzzy set theory and VIKOR method is proposed for prioritization of failure modes, specifically intended to address some limitations of the traditional FMEA. A case study, which assesses the risk of general anesthesia process, is presented to demonstrate the application of the proposed model under fuzzy environment.