TRAX: An approach for the time rational analysis of complex dynamic systems

TRAX: An approach for the time rational analysis of complex dynamic systems
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TRAX:复杂动态系统的时间理性分析方法

DOI:
10.1002/nme.4841
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发表时间:
2015
影响因子:
2.9
通讯作者:
Lecomte C
Lecomte C
中科院分区:
工程技术3区
文献类型:
--
作者:
Lecomte C

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本文介绍了一种理论和算法的简化模型的方法,以有效地评估复杂的动态系统的时间响应。所提出的方法结合了四个主要组成部分:频域中系统传递函数平均值的解析表达式,这些精确表达式的精确和收敛的有理近似,通过有理Krylov子空间中的模型降阶和仅在几个频率点的半解析插值来精确评估这些近似。由此产生的算法原则,以评估一个特定的系统的时间响应是相对简单的:首先评估系统的响应与轻微的附加阻尼在几个频率,然后项目或减少这些响应所跨越的子空间中的系统。简化模型的时间响应隐含地提供了对原系统的精确评估。研究了降阶模型的性质和所提出方法的精度,并讨论了该方法在复杂矩阵系统中的应用。虽然理论和数值算法是在一个矩阵的上下文中提出的,但它们也可以在连续函数上下文中转置。版权所有© 2015约翰威利父子有限公司.
This paper introduces a theoretical and algorithmic reduced model approach to efficiently evaluate time responses of complex dynamic systems. The proposed approach combines four main components: analytical expressions of the average of the system's transfer functions in the frequency domain, precise and convergent rational approximations of these exact expressions, exact evaluation of these approximations through model reduction in rational Krylov subspaces and semi‐analytical interpolation at just a few frequency points. The resulting algorithmic principles to evaluate the time response of a particular system are relatively straightforward: one first evaluates the response of the system with slight additional damping at a few frequencies and one then projects or reduces the system in the subspace spanned by these responses. The time response of the reduced model implicitly provides a precise evaluation of that of the original system. The properties of the reduced models and the precision of the proposed approach are studied, and applications on complex matrix systems are presented and discussed. While the theory and numerical algorithms are presented in a matrix context, they are also transposable in a continuous functional context. Copyright © 2015 John Wiley & Sons, Ltd.
用于特征值计算和模型简化的有理 Krylov 算法
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