面向电子系统间歇故障的改进RPN计算框架

针对经典风险优先值(risk priority number,RPN)方法的数学缺陷、要素缺陷和研究对象缺陷,分析了经典RPN方法存在这些缺陷和不足的原因,提出了一种面向电子系统间歇故障的RPN改进计算方法。该方法采用五态Markov模型进行故障致损次数O的估算,采用DEMATEL方法进行故障位置、机理、模式的相关性/影响性分析,采用马氏距离对RPN一次排序结果中的相同序号进行二次排序,较好的解决了经典RPN方法取值不是连续整数、对3个主要要素S、O、D取值的微小变化敏感等问题。最后,采用某海基设备电子系统的间歇故障案例来力证了改进RPN计算框架的有效性,可清晰区分不同间歇故障的危险级且更为客观,取得较好效果。

Improved RPN computing framework facing to intermittent fault of electronic system

Aiming at solving the defects of risk priority number ( RPN) in mathematics, ingredients and research object , classic RPN method is analyzed .And an improved RPN method facing to intermittent fault of electronic system is presented .This method estimates failure times O by five-state Markov mode, the correlation and influence analysis of fault location , mechanism and mode are carried out by DEMATEL method , and the results which have the same sequence number in RPN first sorting are sorted by Mahalanobis distance . This method solves the problems well , for instance, classic RPN value is not a continuous integer , RPN result is sensitive to fractional changes of three key information factor S, O and D.The improved RPN computing model is applied to analyze intermittent fault case of a sea based equipment , which can get objective risks prioritization of different intermittent faults , and a good result is obtained .