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首页> 外文期刊>International journal of non-linear mechanics >Identifying invariant manifold using phase space warping and stochastic interrogation
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Identifying invariant manifold using phase space warping and stochastic interrogation

机译:使用相空间翘曲和随机询问识别不变流形

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Advances in the generalization of invariant manifolds to finite time, experimental (or observational) flows have stimulated many recent developments in the approximation of invariant manifolds and Lagrangian coherent structures. This paper explores the identification of invariant manifold like structures in experimental settings, where knowledge of a flow field is absent, but phase space trajectories can be experimentally measured. Several existing methods for the approximation of these structures modified for application when only unstructured trajectory data is available. We find the recently proposed method, based on the concept of phase space warping, to outperform other methods as data becomes limited and show it to extend the finite-time Lyapunov exponent method. This finding is based on a comparison of methods for various data quantities and in the presence of both measurement and dynamic noise.
机译:不变流形在有限时间,实验(或观测)流的泛化方面的进展刺激了不变流形和拉格朗日相干结构逼近的许多最新发展。本文探讨了在实验环境中没有流场知识但可以通过实验测量相空间轨迹的不变流形结构的识别方法。当只有非结构化轨迹数据可用时,可以修改几种现有的近似这些结构的方法,以供应用。我们发现,基于相空间扭曲的概念,最近提出的方法在数据变得有限的情况下胜过其他方法,并证明了它可以扩展有限时间Lyapunov指数方法。此发现基于对各种数据量的方法的比较,并且同时存在测量噪声和动态噪声。

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