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Output-Only Modal Analysis of an Internal Unreachable Module Embedded in a Space Electronic Equipment

[+] Author Affiliations
Lassaad Ben Fekih, Georges Kouroussis, David Wattiaux, Olivier Verlinden

University of Mons, Mons, Belgium

Christophe De Fruytier

Thales Alenia Space ETCA, Mont-sur-Marchienne, Belgium

Paper No. ESDA2012-82184, pp. 695-704; 10 pages
  • ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis
  • Volume 1: Advanced Computational Mechanics; Advanced Simulation-Based Engineering Sciences; Virtual and Augmented Reality; Applied Solid Mechanics and Material Processing; Dynamical Systems and Control
  • Nantes, France, July 2–4, 2012
  • Conference Sponsors: International
  • ISBN: 978-0-7918-4484-7
  • Copyright © 2012 by ASME


An approach is proposed to identify the modal properties of a subsystem made up of an arbitrary chosen inner module of embedded space equipment. An experimental modal analysis was carried out along the equipment transverse direction with references taken onto its outer housing. In parallel, a numerical model using the finite element (FE) method was developed to correlate with the measured results. A static Guyan reduction has led to a set of master degrees of freedom in which the experimental mode shapes were expanded. An updating technique consisting in minimizing the dynamic residual induced by the FE model and the measurements has been investigated. A last verification has consisted in solving the numeric model composed of the new mass and stiffness matrices obtained by means of a minimization of the error in the constitutive equation method.

Copyright © 2012 by ASME



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