Improvement of equivalent component approach for reliability analyses of series systems
Improvement of equivalent component approach for reliability analyses of series systems
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DOI：
10.1016/j.strusafe.2017.06.001
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发表时间：
2017-09
影响因子：
5.8
通讯作者：
C. Gong;Wenxing Zhou
中科院分区：
文献类型：
--
作者：
C. Gong;Wenxing Zhou
本文提出了一种改进的等效元件法来评估串联系统的系统可靠性。一个解析表达式推导出评估单位法向量，在一阶可靠性方法的背景下，与等效组件。这提高了在等效分量法中确定系统与等效分量之间的相关系数的计算效率。还提出了一种自适应组合过程，由此在每个组合步骤中组合具有最高相关系数的两个分量。对于具有相等和不等相关元件的串联系统，证明了改进的等效元件法的准确性和效率。最后，通过含10个活性腐蚀缺陷的压力钢管段的系统可靠性分析，说明了改进的等效构件法。
The present study proposes an improved equivalent component approach to evaluate the system reliability of series systems. An analytical expression is derived to evaluate the unit normal vector, in the context of the first-order reliability method, associated with the equivalent component. This improves the computational efficiency for determining the correlation coefficients between the system and equivalent components in the equivalent component approach. An adaptive combining process is also proposed, whereby the two components with the highest correlation coefficient are combined at each combining step. The accuracy and efficiency of the improved equivalent component approach are demonstrated for series systems with equally and unequally correlated components. Finally, the improved equivalent component approach is illustrated through the system reliability analysis of a pressurized steel pipeline segment containing ten active corrosion defects.