A rigorous phase separation method for testing nonlinear structures

Noël, Jean-Philippe; Renson, Ludovic; Grappasonni, Chiara; Kerschen, Gaëtan

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A rigorous phase separation method for testing nonlinear structures

Noël, Jean-Philippe; Renson, Ludovic; Grappasonni, Chiara et al.

2014 • In Proceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering

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https://hdl.handle.net/2268/173388

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Keywords :

Nonlinear phase separation; Nonlinear subspace identification; Numerical continuation

Abstract :

[en] The objective of the present paper is to develop a rigorous identification methodology of nonlinear normal modes (NNMs) of engineering structures. This is achieved by processing experimental measurements collected under broadband forcing. The use of such a type of forcing signal allows to excite multiple NNMs simultaneously and, in turn, to save testing time. A two-step methodology integrating nonlinear system identification and numerical continuation of periodic solutions is proposed for the extraction of the individual NNMs from broadband input and output data. It is demonstrated using a numerical cantilever beam possessing a cubic nonlinearity at its free end. The proposed methodology can be viewed as a nonlinear generalization of the phase separation techniques routinely utilized for experimental modal analysis of linear structures.

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

Renson, Ludovic ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux

Grappasonni, Chiara ; 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 :

A rigorous phase separation method for testing nonlinear structures

Publication date :

September 2014

Event name :

ISMA 2014 - International Conference on Noise and Vibration Engineering

Event place :

Leuven, Belgium

Event date :

15 September - 17 September 2014

Audience :

International

Main work title :

Proceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering

Funders :

FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture

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since 26 October 2014

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