The invention discloses an improved FMEA method based on an interval
intuitionistic fuzzy set and a mixed multi-criterion
decision model. In the first stage, an interval
intuitionistic fuzzy network analysis method is used to determine the weight of risk factors, firstly, the
network structure diagram of risk factors and sub-risk factors is formed, the interval
intuitionistic fuzzy pair comparisonmatrix is constructed and the aggregation degree is calculated, then the local
ranking vector is calculated to obtain the initial super-matrix and weighted super-matrix, and finally the weights of all sub-risk factors are determined. In the second stage, an interval intuitionistic fuzzy comprehensive proportional evaluation method is utilized to determine the risk order of all failure
modes, theset interval intuitionistic fuzzy
risk assessment matrix is constructed for the first time, then the matrix is standardized and weighted to calculate the
total risk and risk degree of each failure mode, and finally the
ranking of all failure
modes is determined. The fuzziness and uncertainty of expert language evaluation is overcome effectively. the hierarchy and interrelation of risk factors areconsidered. Thus, the
risk ranking of failure
modes is more accurate.