Kernel Methods for the Approximation of the Eigenfunctions of the Koopman Operator

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Dades bibliogràfiques
Publicat a:	arXiv.org (Dec 21, 2024), p. n/a
Autor principal:	Lee, Jonghyeon
Altres autors:	Hamzi, Boumediene, Hou, Boya, Owhadi, Houman, Santin, Gabriele, Vaidya, Umesh
Publicat:	Cornell University Library, arXiv.org
Matèries:	Eigenvalues Linearization Partial differential equations Continuous spectra Operators (mathematics) Equilibrium System dynamics Algorithms Nonlinear systems Dynamical systems Nonlinear dynamics Eigenvectors
Accés en línia:	Citation/Abstract Full text outside of ProQuest
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Descripció
Resum:	The Koopman operator provides a linear framework to study nonlinear dynamical systems. Its spectra offer valuable insights into system dynamics, but the operator can exhibit both discrete and continuous spectra, complicating direct computations. In this paper, we introduce a kernel-based method to construct the principal eigenfunctions of the Koopman operator without explicitly computing the operator itself. These principal eigenfunctions are associated with the equilibrium dynamics, and their eigenvalues match those of the linearization of the nonlinear system at the equilibrium point. We exploit the structure of the principal eigenfunctions by decomposing them into linear and nonlinear components. The linear part corresponds to the left eigenvector of the system's linearization at the equilibrium, while the nonlinear part is obtained by solving a partial differential equation (PDE) using kernel methods. Our approach avoids common issues such as spectral pollution and spurious eigenvalues, which can arise in previous methods. We demonstrate the effectiveness of our algorithm through numerical examples.
ISSN:	2331-8422
Font:	Engineering Database