Fault criticality evaluation of metro door based on modified FME A

Door system is a key subsystem of metro train, whose reliability is directly related to the safety of passengers. The Failure mode and effects analysis (FMEA) method based on fuzzy Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) is proposed to evaluate metro door fault criticality. Firstly, the traditional FMEA is used to conduct fuzzy evaluation on risk factors of each failure mode and to obtain weighted decision matrix. Then, the closeness coefficient of each failure mode is obtained by the weighted decision matrix. Finally, the ranking of failure mode of metro door is obtained by referring to the value of relative closeness to the ideal solution. The experiment results show that three failure modes including `Disability of EDCU´, `Nut component wears out´ and `Limit switch Slwears out´ have greater damage on door than other failure modes.