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Instantaneous identification of localized non-linearities in steel framed structures

Published online by Cambridge University Press:  15 September 2010

Pierre Argoul ,
Rosario Ceravolo ,
G. V. Demarie  and
D. Sabia
Pierre Argoul
Affiliation:
Université Paris-Est, UR Navier, École des Ponts ParisTech, 6 & 8 avenue Blaise Pascal, Champs-sur-Marne, 77455 Marne-la-Vallée Cedex 2, France
Rosario Ceravolo*
Affiliation:
Dip. Ingegneria Strutturale e Geotecnica, Politecnico di Torino, c. Duca degli Abruzzi 24, 10129 Torino, Italy
G. V. Demarie
Affiliation:
Dip. Ingegneria Strutturale e Geotecnica, Politecnico di Torino, c. Duca degli Abruzzi 24, 10129 Torino, Italy
D. Sabia
Affiliation:
Dip. Ingegneria Strutturale e Geotecnica, Politecnico di Torino, c. Duca degli Abruzzi 24, 10129 Torino, Italy
*
a Corresponding author: rosario.ceravolo@polito.it
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Abstract

This paper discusses the characteristics of time-frequency estimators to be used in the identification of systems with localized non-linearities. The common idea underlying this research is that, for certain classes of structural response signals, the availability of a limited number of experimental data can be partially obviated by taking into account the “localisation” in time of the frequency components of the signals. Time-frequency techniques for structural identification are reported that extend the definition of instantaneous time-frequency estimators and Gabor instantaneous estimators were extracted from non-stationary vibration signals. In order to foresee their validity on the basis of measured data, methods were applied to seismic responses obtained from numerical tests conducted on steel frames. The results obtained made it possible to evaluate the characteristics of time-frequency identification techniques as well as their efficiency when applied to non-linear structures.

Keywords

Non-linear identificationVolterra seriesframed structuressteel structuresinstantaneous frequencytime-frequency analysisIdentification non-linéairesérie de Volterrastructures portiquesstructures métalliquesfréquence instantanéeanalyse temps-fréquence
Type
Research Article
Information
Mechanics & Industry , Volume 11 , Issue 2 , March 2010 , pp. 105 - 116
Copyright
© AFM, EDP Sciences 2010

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