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整机产品失效机理危害度定量分析方法

, PP. 1208-1211

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Abstract:

针对整机产品失效机理多而复杂、失效数据少、主失效机理分析为定性方法的现状,提出了一种基于Bayes的失效机理危害度定量分析方法.首先利用Dirichlet分布描述产品的先验信息,结合现场失效数据确定失效频率的Bayes后验分布函数,然后通过Slice抽样方法获得失效频率的满条件分布,进而利用Gibbs抽样得到其Bayes估计,从而实现了各失效机理的定量分析.最后在某型光纤连接器失效机理已分析清楚的前提下,分别用FMMEA(FailureModes,MechanismsandEffectsAnalysis)及Bayes方法确定了其主失效机理,结果表明基于Bayes的失效机理危害度定量分析方法考虑了现场未出现的失效机理危害度,其确定的主失效机理比FMMEA结果更具有可信度.

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