Koopman预解式：非线性自治动力系统的Laplace域分析
Koopman Resolvent: A Laplace-Domain Analysis of Nonlinear Autonomous Dynamical Systems
摘要：
我们的研究动机是建立一个拉普拉斯域理论，提供原则和方法来分析和综合系统的非线性动力学。定义为非线性自治动力系统的复合算子半群--Koopman半群及其相关的Koopman生成元--在本研究中起着核心作用。我们介绍的Koopman生成器的预解式，我们称之为Koopman预解式，并提供其三种类型的非线性动力学的谱表征：遍历演化的吸引子，收敛到一个稳定的平衡点，收敛到一个（准）稳定极限环。这表明库普曼预解式提供了这种非线性自治动力学的拉普拉斯域表示。一个计算方面的拉普拉斯域表示也讨论了非平稳库普曼模式的重点。
英文摘要：
The motivation of our research is to establish a Laplace-domain theory that provides principles and methodology to analyze and synthesize systems with nonlinear dynamics. A semigroup of composition operators defined for nonlinear autonomous dynamical systems -- the Koopman semigroup and its associated Koopman generator -- plays a central role in this study. We introduce the resolvent of the Koopman generator, which we call the Koopman resolvent, and provide its spectral characterization for three types of nonlinear dynamics: ergodic evolution on an attractor, convergence to a stable equilibrium point, and convergence to a (quasi-)stable limit cycle. This shows that the Koopman resolvent provides the Laplace-domain representation of such nonlinear autonomous dynamics. A computational aspect of the Laplace-domain representation is also discussed with emphasis on non-stationary Koopman modes.
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