arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.10864math.NAcs.NA
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基于频域有理代理插值的非侵入式双贪婪参数模型降阶

Non-intrusive double-greedy parametric model reduction by interpolation of frequency-domain rational surrogates

Fabio Nobile, Davide Pradovera

摘要:

提出了一种参数动力系统非侵入代理建模的模型降阶方法。整个参数空间上的降阶模型是通过仅在频率上组合替代项来构建的,该替代项是在少数选定的参数值处构建的。这尤其需要通过求解最优化问题来匹配各个极点。如果频率代理是由一个合适的有理插值策略,频率和参数都可以在一个自适应的方式进行采样。在一般情况下,这会产生不同数量的极点,我们提出的算法解决的情况下,频率代理。此外,我们解释了我们的方法如何可以应用,即使在高维设置,通过采用局部细化稀疏网格在参数空间,以削弱灾难的维数。数值例子用于展示该方法的有效性,并强调其在处理不平衡极点匹配以及大量参数时的一些局限性。

英文摘要:

We propose a model order reduction approach for non-intrusive surrogate modeling of parametric dynamical systems. The reduced model over the whole parameter space is built by combining surrogates in frequency only, built at few selected values of the parameters. This, in particular, requires matching the respective poles by solving an optimization problem. If the frequency surrogates are constructed by a suitable rational interpolation strategy, frequency and parameters can both be sampled in an adaptive fashion. This, in general, yields frequency surrogates with different numbers of poles, a situation addressed by our proposed algorithm. Moreover, we explain how our method can be applied even in high-dimensional settings, by employing locally-refined sparse grids in parameter space to weaken the curse of dimensionality. Numerical examples are used to showcase the effectiveness of the method, and to highlight some of its limitations in dealing with unbalanced pole matching, as well as with a large number of parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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