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Shock and Vibration
Volume 2014, Article ID 409298, 8 pages
Research Article

A New Criterion for the Stabilization Diagram Used with Stochastic Subspace Identification Methods: An Application to an Aircraft Skeleton

1High Institute of Technological Studies of Kairouan, Campus Universitaire Raccada, 3100 Kairouan, Tunisia
2High Institute of Applied Sciences and Technologies of Sousse, University of Sousse, Cité Taffala (Ibn Khaldoun), 4003 Sousse, Tunisia

Received 5 July 2012; Accepted 20 November 2012; Published 17 March 2014

Academic Editor: Sami El-Borgi

Copyright © 2014 E. Mrabet et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The modal parameters of a structure that is estimated from ambient vibration measurements are always subject to bias and variance errors. Accordingly the concept of the stabilization diagram is introduced to help users identify the correct model. One of the most important problems using this diagram is the appearance of spurious modes that should be discriminated to simplify modes selections. This study presents a new stabilization criterion obtained through a novel numerical implementation of the stabilization diagram and the discussion of model validation employing the power spectral density. As an application, an aircraft skeleton is used.