Reference : Experimental modal analysis of nonlinear structures using broadband data
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Aerospace & aeronautics engineering
http://hdl.handle.net/2268/173584
Experimental modal analysis of nonlinear structures using broadband data
English
Noël, Jean-Philippe mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux >]
Renson, Ludovic [Université de Liège - ULg > > R&D Direction : Chercheurs ULg en mobilité >]
Grappasonni, Chiara [Université de Liège - ULg > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux >]
Kerschen, Gaëtan mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux >]
Feb-2015
Proceedings of the International Modal Analysis Conference (IMAC) XXXIII
No
No
International
International Modal Analysis Conference (IMAC) XXXIII
du 2 février au 5 février 2015
Society for Experimental Mechanics (SEM)
Orlando
FL
[en] Nonlinear normal modes ; experimental data ; broadband excitation ; nonlinear system identification ; numerical continuation
[en] The objective of the present paper is to develop a rigorous identification methodology of nonlinear normal modes (NNMs) of engineering structures. This is achieved by processing experimental measurements collected under broadband forcing. The use of such a type of forcing signal allows to excite multiple NNMs simultaneously and, in turn, to save testing time. A two-step methodology integrating nonlinear system identification and numerical continuation of periodic solutions is proposed for the extraction of the individual NNMs from broadband input and output data. It is demonstrated using a numerical cantilever beam possessing a cubic nonlinearity at its free end. The proposed methodology can be viewed as a nonlinear generalization of the phase separation techniques routinely utilized for experimental modal analysis of linear structures. The paper ends with a comparison between this new nonlinear phase separation technique and a previously-developed nonlinear phase resonance method.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Union Européenne = European Union - UE = EU
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/173584

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