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In-orbit vibration testing of spacecraft structures
Poncelet, Fabien; Kerschen, Gaëtan; Golinval, Jean-Claude
2008In International Conference on Noise and Vibration Engineering, Leuven, 2008
 

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Keywords :
In-orbit modal testing; spacecraft structures; modal analysis; Blind Source Separation
Abstract :
[en] In-orbit modal testing can be an interesting tool for the monitoring of spacecraft structures. In these applications, it is impossible to measure or to control the excitation resulting, for instance, from an impact with a small asteroid or from the working engines. Consequently the only realistic methodology must be an outputonly modal analysis, also called Operational Modal Analysis (OMA). This paper proposes another way of doing OMA where the post-processing (i.e. the physical modal parameter extraction) is simplified and automated. The methodology uses the Blind Source Separation (BSS) techniques which attempt to recover the source signals only from their observed mixtures. In case of structural dynamic responses, the source signals and the mixing matrix are equivalent to the modal coordinates and the mode matrix, respectively. The paper describes the complete methodology including the post-processing, and its feasibility is demonstrated using a numerical application modeling a truss satellite with the FE method.
Disciplines :
Space science, astronomy & astrophysics
Aerospace & aeronautics engineering
Mechanical engineering
Mathematics
Physics
Author, co-author :
Poncelet, Fabien ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Kerschen, Gaëtan  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Golinval, Jean-Claude  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Language :
English
Title :
In-orbit vibration testing of spacecraft structures
Publication date :
2008
Event name :
International Conference on noise and vibration Engineering
Event place :
Leuven, Belgium
Audience :
International
Main work title :
International Conference on Noise and Vibration Engineering, Leuven, 2008
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