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arXiv 2202.09501math.DS
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用于动力系统的自适应谱 Koopman 方法

The Adaptive Spectral Koopman Method for Dynamical Systems

Bian Li, Yi-An Ma, J. Nathan Kutz, Xiu Yang

AI总结:

本文提出无网格的自适应谱 Koopman(ASK)方法,结合谱配置与 Koopman 算子特征对近似求解非线性自治动力系统,并在一维至三维实验中验证其高精度与灵活性。

摘要:

动力系统在力学、电气工程、化学等领域有着广泛应用。在本工作中,我们提出自适应谱 Koopman(adaptive spectral Koopman,ASK)方法,用于求解非线性自治动力系统。这一新颖数值方法利用谱配置(即伪谱)方法和 Koopman 算子的性质来获得动力系统的解。具体而言,该解被表示为 Koopman 算子的特征函数与特征值之乘积的线性组合,而这些特征对由谱方法近似。与 Euler 格式和 Runge–Kutta 格式等传统时间演化算法不同,ASK 是无网格的,因此在评估解时更加灵活。数值实验证明,ASK 在求解一维、二维和三维动力系统时具有高精度。

英文摘要:

Dynamical systems have a wide range of applications in mechanics, electrical engineering, chemistry, and so on. In this work, we propose the adaptive spectral Koopman (ASK) method to solve nonlinear autonomous dynamical systems. This novel numerical method leverages the spectral-collocation (i.e., pseudo-spectral) method and properties of the Koopman operator to obtain the solution of a dynamical system. Specifically, this solution is represented as a linear combination of the multiplication of Koopman operator's eigenfunctions and eigenvalues, and these eigenpairs are approximated by the spectral method. Unlike conventional time evolution algorithms such as Euler's scheme and the Runge-Kutta scheme, ASK is mesh-free, and hence is more flexible when evaluating the solution. Numerical experiments demonstrate high accuracy of ASK for solving one-, two- and three-dimensional dynamical systems.

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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