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State estimation in structural systems with model uncertainties / Eric M. Hernandez in Journal of engineering mechanics, Vol. 134 N°3 (Mars 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 N°3 (Mars 2008) . - pp.252–257. Titre : State estimation in structural systems with model uncertainties Type de document : texte imprimé Auteurs : Eric M. Hernandez, Auteur ; Dionisio Bernal, Auteur Année de publication : 2008 Article en page(s) : pp.252–257. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Filters  Estimation  Structural  behavior  Earthquake  engineering  Measurement Résumé : This paper presents an observer designed under the assumption that differences between predicted and measured outputs arise from discrepancies between the real structural system and the nominal model used to represent it. The observer gain is independent of the assumed model error parametrization and proves to be the transpose of the state to output matrix of a state space formulation. The estimated state with the proposed observer is shown to be identical to that obtained by exciting the nominal model with the known input while adjusting the measured portion of the state to match the measurements at the start of every step. Numerical experiments suggest that the proposed observer can provide state estimates that are substantially more accurate than results predicted by projecting the measurements in a truncated modal space. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A3%2825 [...] [article] State estimation in structural systems with model uncertainties [texte imprimé] / Eric M. Hernandez, Auteur ; Dionisio Bernal, Auteur . - 2008 . - pp.252–257. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 N°3 (Mars 2008) . - pp.252–257. Mots-clés : Filters  Estimation  Structural  behavior  Earthquake  engineering  Measurement Résumé : This paper presents an observer designed under the assumption that differences between predicted and measured outputs arise from discrepancies between the real structural system and the nominal model used to represent it. The observer gain is independent of the assumed model error parametrization and proves to be the transpose of the state to output matrix of a state space formulation. The estimated state with the proposed observer is shown to be identical to that obtained by exciting the nominal model with the known input while adjusting the measured portion of the state to match the measurements at the start of every step. Numerical experiments suggest that the proposed observer can provide state estimates that are substantially more accurate than results predicted by projecting the measurements in a truncated modal space. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A3%2825 [...]