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Nonlinear modal analysis of the SmallSat spacecraft
Renson, Ludovic; Kerschen, Gaëtan; Newerla, Alfred
2012In Proceedings of the SEM IMAC XXX Conference
 

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Keywords :
Nonlinear Dynamics; Modal Analysis; Nonlinear Normal Modes; Space Structure
Abstract :
[en] Non-linear elements are present in practically all spacecraft structures. The assumption of a (quasi-)linear structure is nevertheless adequate for structural analyses and design verification purposes in those cases where these structural non-linearities are relatively weak or not substantially activated by the mechanical environments encountered during the launch or during ground testing. However, when significant non-linear effects in spacecraft structures are no longer negligible then linear modal analysis will not be able to handle non-linear dynamical phenomena in an adequate manner: the development of a non-linear analogue of linear modal analysis becomes an urgent and important issue. The objective of this paper is to show that nonlinear normal modes (NNMs) represent a useful and practical tool in this context. A full-scale spacecraft structure is considered and is modeled using the finite element method. Its NNMs are computed using advanced numerical algorithms, and the resulting dynamics is then carefully analyzed. Nonlinear phenomena with no linear counterpart including nonlinear modal interactions are also highlighted.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Renson, Ludovic ;  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
Newerla, Alfred;  European Space Agency (ESTEC)
Language :
English
Title :
Nonlinear modal analysis of the SmallSat spacecraft
Publication date :
2012
Event name :
International Modal Analysis Conference (IMAC) XXX
Event organizer :
Society for Experimental Mechanics (SEM)
Event place :
Jacksonville, United States - Florida
Event date :
January 2012
Audience :
International
Main work title :
Proceedings of the SEM IMAC XXX Conference
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
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since 20 January 2012

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