A novel surrogate for extremes of random functions

A novel surrogate for extremes of random functions
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随机函数极值的新颖替代

DOI:
10.1016/j.ress.2023.109493
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发表时间:
2023
影响因子:
8.1
通讯作者:
Gurley, Kurtis R.
Gurley, Kurtis R.
中科院分区:
工程技术1区
文献类型:
--
作者:
Xu, Hui;Grigoriu, Mircea D.;Gurley, Kurtis R.

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随机问题的数值解需要通过有限维(FD)模型在其定义中表示随机函数,即,时间的确定性函数和随机变量的有限集合。通常用多项式混沌(PC)模型来表示这些FD代理的系数。我们提出了一种新的模型,称为多项式混沌平移(PCT)模型,它完全匹配的FD系数的边缘分布和近似的依赖。基于PC和PCT的FD模型是为一组测试用例和在佛罗里达大学边界层风洞设施记录的风压时间序列构建的。基于PCT的模型准确地捕获FD系数和目标时间序列的极值的联合分布,而基于PC的FD模型不具有这种能力。
Numerical solutions of stochastic problems require the representation of random functions in their definitions by finite dimensional (FD) models, i.e., deterministic functions of time and finite sets of random variables. It is common to represent the coefficients of these FD surrogates by polynomial chaos (PC) models. We propose a novel model, referred to as the polynomial chaos translation (PCT) model, which matches exactly the marginal distributions of the FD coefficients and approximately their dependence. PC- and PCT-based FD models are constructed for a set of test cases and a wind pressure time series recorded at the boundary layer wind tunnel facility at the University of Florida. The PCT-based models capture the joint distributions of the FD coefficients and the extremes of target times series accurately while PC-based FD models do not have this capability.
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