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Robust Subspace Identification of a Nonlinear Satellite Using Model Reduction
Dossogne, Tilàn; Noël, Jean-Philippe; Kerschen, Gaëtan
2016In Proceedings of the International Modal Analysis Conference (IMAC) XXXIV
 

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Keywords :
subspace method; nonlinear system identification; satellite; spurious poles; nonsmooth nonlinearities; spacecraft
Abstract :
[en] The frequency-domain nonlinear subspace identification (FNSI) method has recently been successfully applied to large-scale nonlinear structures. One of the key features of FNSI is the nonlinear generalisation of the stabilisation diagram. However, as in linear system identification, the selection of the model order in the diagram is complicated by the presence of spurious poles, resulting from noise and modelling errors. Spurious poles have been shown to strongly perturb the estimation of the nonlinear coefficients. The present paper establishes a constructive procedure to discriminate between spurious and genuine poles. This procedure is derived in modal space and is based on a dominancy index and on model reduction techniques. It is demonstrated on a complete satellite structure possessing nonsmooth nonlinearities and high modal density. Spurious frequency variations in the nonlinear coefficients are proved to be effectively removed, significantly improving the quality of the overall identified model.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Dossogne, Tilàn ;  Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Noël, Jean-Philippe ;  Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Kerschen, Gaëtan  ;  Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Language :
English
Title :
Robust Subspace Identification of a Nonlinear Satellite Using Model Reduction
Publication date :
January 2016
Event name :
International Modal Analysis Conference (IMAC) XXXIV
Event organizer :
Society for Experimental Mechanics (SEM)
Event place :
Orlando, United States - Florida
Event date :
du 25 janvier au 28 janvier 2016
Audience :
International
Main work title :
Proceedings of the International Modal Analysis Conference (IMAC) XXXIV
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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