The effect of parameter uncertainty on achieved safety integrity of safety system
The effect of parameter uncertainty on achieved safety integrity of safety system
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DOI：
10.1016/j.ress.2011.10.015
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发表时间：
2012-03
期刊：
影响因子：
--
通讯作者：
Ming Xu;Tao Chen;Xianhui Yang
中科院分区：
文献类型：
--
作者：
Ming Xu;Tao Chen;Xianhui Yang
本文介绍了安全相关不确定度的概念和安全相关不确定度的测量方法。SR不确定性关注的是参数不确定性对系统不安全不确定性的影响（根据实现安全完整性水平来定义），这与对系统整体不确定性的影响直接相反。讨论了SR不确定度的性质，强调了SR不确定度在安全系统分析中的意义。传统的全局敏感性分析（GSA）处理整体不确定性是不合适的，当SR不确定性感兴趣。我们提出并讨论了测量SR不确定度的四种方法。通过与GSA的比较，验证了所提方法的有效性。
This paper introduces the concept of safety-related (SR) uncertainty and the methodology to measure SR uncertainty. SR uncertainty is concerned with the effect of parameter uncertainty on the uncertainty of system unsafety (defined with respect to achieve safety integrity level), which is in direct contrast to the effect on overall system uncertainty. The properties of SR uncertainty are discussed and its significance in analyzing safety systems is highlighted. The conventional global sensitivity analysis (GSA) to handle overall uncertainty is inappropriate when SR uncertainty is of interest. We present and discuss four methods to measure SR uncertainty. Three examples are used to demonstrate the effectiveness of the proposed methods in comparison with GSA.