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arXiv 2602.14537math.OCcs.SYeess.SY
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关于受控非线性系统Koopman线性嵌入存在的存在性

On the Existence of Koopman Linear Embeddings for Controlled Nonlinear Systems

Contextual Robotics Institute, UC San Diego(加州大学圣地亚哥分校情境机器人研究所);Department of Computing and Mathematical Sciences, California Institute of Technology(加州理工学院计算与数学科学系)

Xu Shang, Masih Haseli, Jorge Cortés, Yang Zheng

AI总结:

本文研究了受控非线性系统Koopman线性嵌入存在的条件,提出CAP结构作为必要条件,并通过符号程序判断系统是否具备该结构以区分近似误差来源。

摘要:

Koopman线性表示已成为非线性系统控制设计中的一种流行工具,但仍然不清楚这种表示何时是精确的。在本文中,我们建立了受控非线性系统是否具有精确有限维Koopman线性表示的充分必要条件,我们称之为Koopman线性嵌入。我们证明,此类系统必须能够转换为一种特殊的受控仿射保持(CAP)结构,这强制了状态对控制输入的仿射依赖,并将所有非线性部分隔离到一个自主子系统中。我们进一步证明,该自主子系统本身必须具有有限维的Koopman线性模型,并且具有足够丰富的Koopman不变子空间。最后,我们介绍了一种符号程序来确定给定的受控非线性系统是否具有CAP结构,从而阐明Koopman近似误差是来自系统动态本身还是来自提升函数的选择。

英文摘要:

Koopman linear representations have become a popular tool for control design of nonlinear systems, yet it remains unclear when such representations are exact. In this paper, we establish sufficient and necessary conditions under which a controlled nonlinear system admits an exact finite-dimensional Koopman linear representation, which we term Koopman linear embedding. We show that such a system must be transformable into a special control-affine preserved (CAP) structure, which enforces affine dependence of the state on the control input and isolates all nonlinearities into an autonomous subsystem. We further prove that this autonomous subsystem must itself admit a finite-dimensional Koopman linear model with a sufficiently-rich Koopman invariant subspace. Finally, we introduce a symbolic procedure to determine whether a given controlled nonlinear system admits the CAP structure, thereby elucidating whether Koopman approximation errors arise from intrinsic system dynamics or from the choice of lifting functions.

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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