Abstract
In this paper, the Common Cause Failures (CCFs) we consider are caused by random loads and strength. Unlike the general reliability model for CCF systems, failure modes are regarded as the basic units instead of components. Firstly, the reliability models of typical series systems and parallel systems are developed based on failure mechanism analysis, GLSI model and conditional probability theory. Secondly, the reliability model of a specific series-parallel system subject to two kinds of Common Causes (CCs) is developed based on reliability block diagram. Furthermore, the general modeling procedures of CCF systems subject to two kinds of CCs are presented. Finally, by using Monte-Carlo simulation, a group of data is given to verify the CCF model of the given series-parallel system and the CCF model is compared with the independent-failure model. It can be concluded that the CCF modeling method proposed in this paper is applicable for incomplete CCF systems subject to two-kind common causes.
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