【摘要】 通过系统层的载荷-强度干涉分析,展示了零件可靠度(或失效概率)的属性、精细结构及其与载荷／强度分布特性之间的关系,分析了传统的零件可靠性干涉分析过程中发生的系统可靠性信息损失问题以及无法通过传统的零件可靠度参数构建一般系统(具有失效相关性的非独立失效系统)可靠性模型的原因。从数学原理方面探讨了载荷-强度作用机制和冗余系统存在“共因失效”这种失效相关性的原因和建立冗余系统共因失效概率模型的方法。最后,建立了能根据系统的有限失效数据预测系统任意阶失效概率的离散化的系统失效概率模型。更多还原

【Abstract】 Through a thoroughly analysis to system-level load-strength interference relationship, the problems of information loss in the process of conventional component reliability analysis and modeling are discussed, as well as the reason why it is impossible to construct dependent system reliability model simply by means of component reliability parameter. Further more, the mechanism of common cause failure (CCF) of k/n(F) system is discussed. It is shown that the randomness of environment load is the "root cause" of common cause failures. CCF involves concepts, such as "root cause" and "coupling mechanism" which are interpreted mathematically from the viewpoint of random environment load bringing about failure dependency. Opinions about "inherent dependency", "additional dependency", "absolute CCF" and "relative CCF" are presented and discussed. At last, an approach is presented to develop discrete common cause failure probabilities model based on the loadstrength interference analysis of system-level.更多还原