Failure mode analysis on machining center based on possibility theory

Abstract

Aiming at the uncertainty of the expert judgment in the failure mode and effect analysis of machining centers, a failure mode analysis method for the machining centers based on the possibility theory is proposed. To express the uncertainty of the expert judgment, the possibility distribution of the attribute of the judgment is established and the information fusion of the possibility distribution is implemented using the comprehensive analysis method, obtaining the possibility distribution of the influence factor; The values are assigned to the weights using the subjective-objective combination weighting approach which combines the variation coefficient method and the subjective weighting method. And then the possibility values of the RPN are calculated and ranked. A machining center is taken as the example, and the proposed method is applied to analyze the criticality of its failure modes, and the design for reliability promotion is presented according to the ranking of criticality.