Nonlinear system identification; Nonlinearity characterisation; Low-order piecewise polynomials
Abstract :
[en] The present paper addresses the problem of characterising structural nonlinearities in view of system identification. A low-order local modelling strategy is proposed and encapsulated in a recently-introduced frequency-domain nonlinear subspace method for the estimation of model parameters. The complete methodology is first demonstrated using two academic examples, namely a Duffing oscillator and a five-degree-of-freedom system comprising two nonlinearities. The identification of an experimental beam involving nonlinear geometrical behaviour is finally addressed.
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
Kerschen, Gaëtan ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Language :
English
Title :
Low-order local modelling of structural nonlinearities
Publication date :
July 2012
Event name :
XVIIIth Symposium on Vibrations, shocks and noise (VCB 2012)
Event place :
Paris, France
Event date :
du 3 au 5 juillet 2012
Audience :
International
Main work title :
Proceedings of the XVIIIth Symposium on Vibrations, shocks and noise (VCB 2012)
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
