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Handling the temperature effect in vibration monitoring / Basseville, Michèle in Journal of engineering mechanics, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 3 (Mars 2010) . - pp. 367-378 Titre : Handling the temperature effect in vibration monitoring : two subspace-based analytical approaches Type de document : texte imprimé Auteurs : Basseville, Michèle, Auteur ; Bourquin, Frédéric, Auteur ; Mevel, Laurent, Auteur Article en page(s) : pp. 367-378 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Vibration  Damage  Assessment  Temperature  effects  Analytical  techniques  Structural  dynamics. Résumé : The dynamics of most civil engineering structures is affected by the ambient temperature. This raises the issue of discriminating changes in modal parameters due to damage from those due to such effects. A statistical parametric damage detection algorithm based on a null space residual associated with output-only subspace identification and a chi2 test built on that residual has been designed by some of the writers. The purpose of this paper is to propose two extensions of this detection method which account for the temperature effect. The first extension uses a thermal model for deriving a temperature-adjusted null space. The second extension exploits the thermal model together with a statistical nuisance rejection technique. Both methods are illustrated on a laboratory test case within a climatic chamber. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&ONLINE=YES&s [...] [article] Handling the temperature effect in vibration monitoring : two subspace-based analytical approaches [texte imprimé] / Basseville, Michèle, Auteur ; Bourquin, Frédéric, Auteur ; Mevel, Laurent, Auteur . - pp. 367-378. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 3 (Mars 2010) . - pp. 367-378 Mots-clés : Vibration  Damage  Assessment  Temperature  effects  Analytical  techniques  Structural  dynamics. Résumé : The dynamics of most civil engineering structures is affected by the ambient temperature. This raises the issue of discriminating changes in modal parameters due to damage from those due to such effects. A statistical parametric damage detection algorithm based on a null space residual associated with output-only subspace identification and a chi2 test built on that residual has been designed by some of the writers. The purpose of this paper is to propose two extensions of this detection method which account for the temperature effect. The first extension uses a thermal model for deriving a temperature-adjusted null space. The second extension exploits the thermal model together with a statistical nuisance rejection technique. Both methods are illustrated on a laboratory test case within a climatic chamber. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&ONLINE=YES&s [...]