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Subspace-based identification of a distributed nonlinearity in time and frequency domains
Anastasio, Dario; Marchesiello, Stefano; Noël, Jean-Philippe et al.
2019In Proceedings of the International Modal Analysis Conference (IMAC) XXXV
 

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Keywords :
Nonlinear system identification; Subspace identification; Distributed nonlinearity; Geometric nonlinearity; Nonlinear beam
Abstract :
[en] Nonlinear system identification has become of great interest during the last decades. However, a common and shared framework is not present yet, and the identification may be challenging, especially when real engineering structures are considered with strong nonlinearities. Subspace methods have proved to be effective when dealing with local nonlinearities, both in time domain (TNSI method) and in frequency domain (FNSI method). This study reports an improvement for both methods, as a first attempt to account for distributed nonlinearities, which is still an open question in the research community. A numerical beam under moderately large oscillations that exhibits geometric nonlinearity is considered. The object of the identification process is to exploit its behavior through the correct identification of the parameters that define the nonlinearity. Results show a high level of confidence between the two methods, and suggest that a more complete analysis of distributed nonlinear phenomena can be conducted based on these approaches.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Anastasio, Dario;  Politecnico di Torino
Marchesiello, Stefano;  Politecnico di Torino
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 :
Subspace-based identification of a distributed nonlinearity in time and frequency domains
Publication date :
2019
Event name :
International Modal Analysis Conference (IMAC) XXXVI
Event organizer :
Society for Experimental Mechanics (SEM)
Event place :
Orlando, United States - Florida
Event date :
du 12 février au 15 février 2018
Audience :
International
Main work title :
Proceedings of the International Modal Analysis Conference (IMAC) XXXV
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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