arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.11139math.NAcs.NA
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误差估计和不确定度量化首次达到门限值

Error estimation and uncertainty quantification for first time to a threshold value

Jehanzeb H. Chaudhry, Donald Estep, Zachary Stevens, Simon J. Tavener

摘要:

经典的微分方程后验误差分析将误差量化为一个感兴趣的量(QoI),它表示为解的一个有界线性泛函。在这项工作中,我们认为后验误差估计的数量的利益,不能以这种方式表示,即在第一次越过阈值的时间。我们推导出两种表示这样的错误,并使用基于伴随的后验方法来估计未知的条款,出现在我们的代表。第一种表示是基于使用泰勒定理的线性化。第二种表示是通过实现标准的求根技术。我们提供了几个例子,证明了方法的准确性。然后,我们将这些误差估计嵌入到一个框架内,当微分方程的参数不确定时,提供累积分布函数的误差界。

英文摘要:

Classical a posteriori error analysis for differential equations quantifies the error in a Quantity of Interest (QoI) which is represented as a bounded linear functional of the solution. In this work we consider a posteriori error estimates of a quantity of interest that cannot be represented in this fashion, namely the time at which a threshold is crossed for the first time. We derive two representations for such errors and use an adjoint-based a posteriori approach to estimate unknown terms that appear in our representation. The first representation is based on linearizations using Taylor's Theorem. The second representation is obtained by implementing standard root-finding techniques. We provide several examples which demonstrate the accuracy of the methods. We then embed these error estimates within a framework to provide error bounds on a cumulative distribution function when parameters of the differential equations are uncertain.

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