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Sensitivity analysis methods for reliability problems

机译:可靠性问题的灵敏度分析方法

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In reliability problems an important aspect is the study of the influence of parameter changes on the target reliability which is often more an operational value. Since in complex problems such quantities have to be computed often, efficient methods for doing this are desirable. Here some methods for sensitivity analysis are outlined. For a FORM/SORM analysis it is possible to get sensitivity measures from the Lagrange multiplier at the beta point. This allows simple estimates for the sensitivities with respect to parameters without additional computations. In the general case the partial derivatives and sensitivities of the failure probability with respect to parameters are given by surface integrals over the limit state surface. Such integrals can be transformed into domain integrals over the safe domain using the divergence theorem (Gauss-Ostrogradsky theorem). By modifying the integrands in a suitable way, it is possible to modify the integration domains such that the integrals can be estimated in a more efficient way.
机译:在可靠性问题中,重要的方面是研究参数变化对目标可靠性的影响,而目标可靠性通常更多是操作价值。由于在复杂的问题中必须经常计算这样的数量,因此需要有效的方法来执行此操作。这里概述了一些灵敏度分析方法。对于FORM / SORM分析,可以从Beta点处的Lagrange乘数获得灵敏度度量。这允许相对于参数的灵敏度的简单估计,而无需额外的计算。在一般情况下,失效概率相对于参数的偏导数和灵敏度由极限状态曲面上的曲面积分给出。可以使用散度定理(高斯-奥斯特格拉格斯基定理)将此类积分转换为安全域上的域积分。通过以合适的方式修改积分,可以修改积分域,使得可以以更有效的方式估计积分。

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