A novel surrogate for extremes of random functions
A novel surrogate for extremes of random functions
复制标题
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.
中科院分区:
文献类型:
--
作者:
Xu, Hui;Grigoriu, Mircea D.;Gurley, Kurtis R.
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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