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Experimental modal analysis of nonlinear structures using broadband data
Noël, Jean-Philippe; Renson, Ludovic; Grappasonni, Chiara et al.
2015In Proceedings of the International Modal Analysis Conference (IMAC) XXXIII
 

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Keywords :
Nonlinear normal modes; experimental data; broadband excitation; nonlinear system identification; numerical continuation
Abstract :
[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.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Noël, Jean-Philippe ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Renson, Ludovic ;  Université de Liège - ULiège > R&D Direction : Chercheurs ULiège en mobilité
Grappasonni, Chiara ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Kerschen, Gaëtan  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Language :
English
Title :
Experimental modal analysis of nonlinear structures using broadband data
Publication date :
February 2015
Event name :
International Modal Analysis Conference (IMAC) XXXIII
Event organizer :
Society for Experimental Mechanics (SEM)
Event place :
Orlando, United States - Florida
Event date :
du 2 février au 5 février 2015
Audience :
International
Main work title :
Proceedings of the International Modal Analysis Conference (IMAC) XXXIII
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
UE - Union Européenne [BE]
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