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失效排序及纠正方法是可靠性研究的重要内容,针对传统失效模式和影响分析(FMEA)中风险优先数(RPN)排序方法的准确性差、灵敏度低以及RPN数值的离散性、重复性等缺陷,从减少主观因素干扰,提高优先数可信度的角度,建立一种改进方法—基于经济损失的RPN排序方法(ERPN)。首先确定某潜在失效情景的严重度,再确定其初始事件发生的概率P以及由失效导致的经济损失E,用P和E的乘积作为ERPN值。将该改进方法用于某厂珍珠岩吸声板生产线的冲压工艺的失效分析,并用发明问题解决理论(TRIZ)对失效模式进行分类和纠正。结果表明,ERPN方法在解决工程实际问题上是可行、有效的。
In order to solve the problems of poor accuracy, low sensitivity and discreteness and repeatability of RPN values in traditional failure mode and impact analysis (FMEA), the method of sorting and correcting failures is an important part of reliability research. From the perspective of reducing the interference of subjective factors and increasing the credibility of the priority number, an improved method, RPN Ranking Based on Economic Loss (ERPN), is established. First determine the severity of a potential failure scenario, and then determine the probability of its initial event P and economic losses caused by failure E, P and E as the product of the ERPN value. The improved method was applied to the failure analysis of the stamping process of perlite sound-absorbing board production line of a factory, and the failure mode was classified and corrected by the invention of problem solving theory (TRIZ). The results show that the ERPN method is feasible and effective in solving practical engineering problems.