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Abstract: Through analysis the effects of deviation of the component
strength and the common environment load to each failure mode in
redundant structural systems, the mechanism of common cause failures
when all components strength variables are independent is illustrated.
As a kind of dependent failures, the basic root cause of common cause
failures is discussed in detail. Using the results of JC method, the
multiplicity failure probability of systems can be expressed
approximately by component individual failure probability and 2-class
union failure probability. An approximate approach to failures
probability estimation is developed. By means of the new model derived
from environment load-component property analysis, common cause failures
probability of r-out-of-n: g systems can be easily evaluated. An example
is given to show availability and effectiveness of the method. The
results of calculation and Monte Carlo simulation are in good conformity
to each other.
Key words: Common cause failure Structural system Reliability
Failure-dependency JC method
CLC No: TH122 TB114.3
国家自然科学基金资助项目(50275025).
Received 20040929, received in revised form 20050112
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