Abstract:

To overcome the shortcomings of the traditional risk priority number(RPN) method, an evaluation method with multi-assignments was proposed based on the multi-expert evaluation. The expert weight was assigned by an abjective weight measure. The interval RPNs were sorted using the distance measure based on the idea of the technique for order preference by similarity to an ideal solution(TOPSIS). As an example, the RPNs of the fauer modes of 3 critical components of a certain type of machining center were calculated and sorted by the proposed method, and the weak links of reliability were found. The method can also be used to analyze the RPN of the complete machine.

Key words: machine tool, machining center, group decision-making, expert weight, interval number, risk priority number(RPN)