arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2301.06557eess.SYcs.SY
收藏

多项式非线性系统的有限维Koopman形式

Finite Dimensional Koopman Form of Polynomial Nonlinear Systems

Lucian Cristian Iacob, Maarten Schoukens, Roland Tóth

AI总结:

针对多项式非线性系统Koopman表示缺乏构造性理论、近似误差不明确的问题,提出系统化方法计算连续时间下该类系统的有限维Koopman嵌入,可无近似完全表征系统动力学。

摘要:

Koopman框架是一种常用方法,它通过所谓的可观测量函数,经升维过程将有限维非线性系统转化为无限维但线性的模型。尽管算子层面的无限维表示已有丰富理论,但关于如何选择可观测量以实现这些表示的构造性成果仍很少。对于实际应用中极为重要的有限维Koopman表示的可能性,目前尚无构造性理论。因此在实际应用中,人们通常采用基于数据的方法,并临时选择可观测量函数。当截断到有限数量的基时,也无法明确获知引入的近似误差。本文提出一种系统化方法,用于计算一类特定连续时间多项式非线性系统的有限维Koopman嵌入,该嵌入无需近似即可完全表征非线性系统的动力学特性。

英文摘要:

The Koopman framework is a popular approach to transform a finite dimensional nonlinear system into an infinite dimensional, but linear model through a lifting process, using so-called observable functions. While there is an extensive theory on infinite dimensional representations in the operator sense, there are few constructive results on how to select the observables to realize them. When it comes to the possibility of finite Koopman representations, which are highly important form a practical point of view, there is no constructive theory. Hence, in practice, often a data-based method and ad-hoc choice of the observable functions is used. When truncating to a finite number of basis, there is also no clear indication of the introduced approximation error. In this paper, we propose a systematic method to compute the finite dimensional Koopman embedding of a specific class of polynomial nonlinear systems in continuous-time such that, the embedding, without approximation, can fully represent the dynamics of the nonlinear system.

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。

↑