Reference : Subspace and nonlinear-normal-modes-based identification of a beam with softening-har...
Scientific congresses and symposiums : Paper published in a book
Engineering, computing & technology : Aerospace & aeronautics engineering
http://hdl.handle.net/2268/157965
Subspace and nonlinear-normal-modes-based identification of a beam with softening-hardening behaviour
English
Grappasonni, Chiara mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux >]
Noël, Jean-Philippe mailto [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-2014
Proceedings of the International Modal Analysis Conference (IMAC) XXXII
No
No
International
XXXII IMAC Conference & Exposition On Structural Dynamics
from 03-02-2014 to 06-02-2014
Society for Experimental Mechanics
Orlando
FL
[en] nonlinear system identification ; subspace identification ; experimental test ; softening hardening behaviour ; nonlinear normal modes
[en] The capability to reproduce and predict with high accuracy the behaviour of a real system is a fundamental task of numerical models. In nonlinear structural dynamics, additional parameters compared to classical linear modelling, which include the nonlinear coefficient and the mathematical form of the nonlinearity, need to be identified to bring the numerical predictions in good agreement with the experimental observations. In this context, the present paper presents a method for the identification of an experimental cantilever beam with a geometrically nonlinear thin beam clamped with a prestress, hence giving rise to a softening-hardening nonlinearity. A novel nonlinear subspace identification method formulated in the frequency domain is first exploited to estimate the nonlinear parameters of the real structure together with the underlying linear system directly from the experimental tests. Then a finite element model, built from the estimated parameters, is used to compute the backbone of the first nonlinear normal mode motion. These numerical evaluations are compared to a nonlinear normal modes-based identification of the structure using system responses to stepped sine excitation at different forcing levels.
Union Européenne = European Union - UE = EU ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
ERC Starting Grant NoVib 307265
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/157965

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