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arXiv 1903.06103math.OC
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基于Koopman算子的车辆动力学数据驱动辨识

Data-driven identification of vehicle dynamics using Koopman operator

Vit Cibulka, Tomas Hanis, Martin Hromcik

摘要:

本文介绍了使用Koopman算子的车辆动力学识别的结果。基本思想是使用所谓的基函数将非线性系统(在我们的例子中是汽车)的状态空间转换到高维空间,其中系统动态是线性的。基函数的选取是一个关键问题,如何选取基函数目前还没有一个通用的方法,本文对此进行了讨论。两种不同的方法来选择基函数。第一种方法,基于扩展动态模式分解,在很大程度上依赖于专家基的选择,是完全数据驱动的。第二种方法利用非线性动力学的知识,这是用来构造Koopman算子的特征函数,这些特征函数是已知的,通过定义沿着非线性系统轨迹线性地演化。然后,本征函数被用作预测的基函数。每种方法都给出了一个数值例子,并讨论了该方法对非线性系统的可行性。

英文摘要:

This paper presents the results of identification of vehicle dynamics using the Koopman operator. The basic idea is to transform the state space of a nonlinear system (a car in our case) to a higher-dimensional space, using so-called basis functions, where the system dynamics is linear. The selection of basis functions is crucial and there is no general approach on how to select them, this paper gives some discussion on this topic. Two distinct approaches for selecting the basis functions are presented. The first approach, based on Extended Dynamic Mode Decomposition, relies heavily on expert basis selection and is completely data-driven. The second approach utilizes the knowledge of the nonlinear dynamics, which is used to construct eigenfunctions of the Koopman operator which are known by definition to evolve linearly along the nonlinear system trajectory. The eigenfunctions are then used as basis functions for prediction. Each approach is presented with a numerical example and discussion on the feasibility of the approach for a nonlinear

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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