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Abstract: In the presented model, logic relationship of system is
constructed and reliability expression of system is obtained with fault
tree or block-diagram before considering common cause failure. Then
replacing the reliability expression with a new one which includes the
effects of common cause failure. To represent common cause failure, the
elements are subject to failure by Poisson failure processes that govern
simultaneous failure of a specific subset of the elements. The method
for calculating the reliability of system requires that a procedure
exists for determining system reliability from element reliabilities
under the statistically-independent-component assumption. Several
examples including typical series system, parallel system and
series-parallel system are given to explain how to use the model, and
the results are compared with the system reliabilities not considering
common cause failures. The results are consistent with the traditional
qualitative analysis, which shows the validity of the model.
Key words: Common cause failure System reliability
Failure-dependence Reliability Reliability model
CLC No: TH122
TB114.3
国家自然科学基金资助项目(50275025).
Received 20040317, received in revised form 20040821
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