Article (Scientific journals)
A spectral characterization of nonlinear normal modes
Cirillo, G. I.; Mauroy, A.; Renson, Ludovic et al.
2016In Journal of Sound and Vibration, 377, p. 284-301
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Keywords :
Characterization; Invariant manifolds; Koopman operator; Nonlinear normal modes; Parametrization; Spectral; Degrees of freedom (mechanics); Eigenvalues and eigenfunctions; Phase space methods; Parametrizations; Spectrum analyzers
Abstract :
[en] This paper explores the relationship that exists between nonlinear normal modes (NNMs) defined as invariant manifolds in phase space and the spectral expansion of the Koopman operator. Specifically, we demonstrate that NNMs correspond to zero level sets of specific eigenfunctions of the Koopman operator. Thanks to this direct connection, a new, global parametrization of the invariant manifolds is established. Unlike the classical parametrization using a pair of state-space variables, this parametrization remains valid whenever the invariant manifold undergoes folding, which extends the computation of NNMs to regimes of greater energy. The proposed ideas are illustrated using a two-degree-of-freedom system with cubic nonlinearity. © 2016 Elsevier Ltd
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Cirillo, G. I.;  Control Group, Department of Engineering, University of Cambridge, Cambridge, United Kingdom
Mauroy, A.;  Systems and Modeling Research Group, Department of Electrical Engineering and Computer Science, University of Liège, Liège, Belgium
Renson, Ludovic 
Kerschen, Gaëtan  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Sepulchre, Rodolphe ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Systèmes et modélisation
Language :
English
Title :
A spectral characterization of nonlinear normal modes
Publication date :
2016
Journal title :
Journal of Sound and Vibration
ISSN :
0022-460X
eISSN :
1095-8568
Publisher :
Academic Press
Volume :
377
Pages :
284-301
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 November 2017

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