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Frequency-domain subspace identification of nonlinear mechanical systems
Noël, Jean-Philippe; Kerschen, Gaëtan
2013In Proceedings of the 5th International Operational Modal Analysis Conference
 

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Keywords :
Nonlinear system identification; Subspace method; Frequency domain; Space structure
Abstract :
[en] The objective of the present paper is to address the identification of a real-life strongly nonlinear space structure, the EADS-Astrium SmallSat spacecraft. To this end, a new nonlinear subspace identification method formulated in the frequency domain is exploited, referred to as the FNSI method. The frequency response functions of the underlying linear spacecraft and the amplitudes of the nonlinear internal forces are estimated based on a periodic-random data set corrupted by noise. This application is challenging for several reasons, including high modal density, highly non-proportional damping and the non-smooth nature of the nonlinearities.
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 :
Frequency-domain subspace identification of nonlinear mechanical systems
Publication date :
May 2013
Event name :
5th International Operational Modal Analysis Conference
Event place :
Guimarães, Portugal
Event date :
13 - 15 May 2013
Audience :
International
Main work title :
Proceedings of the 5th International Operational Modal Analysis Conference
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
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