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Vibration‐based damage localization with load vectors under temperature changes
Author(s) -
Bhuyan Md Delwar Hossain,
Gautier Guillaume,
Le Touz Nicolas,
Döhler Michael,
Hille Falk,
Dumoulin Jean,
Mevel Laurent
Publication year - 2019
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.2439
Subject(s) - finite element method , sensitivity (control systems) , modal , vibration , state vector , basis (linear algebra) , modal analysis , structural engineering , field (mathematics) , beam (structure) , control theory (sociology) , computer science , engineering , mathematics , materials science , acoustics , physics , electronic engineering , artificial intelligence , geometry , control (management) , classical mechanics , polymer chemistry , pure mathematics
Summary Damage detection and localization in civil or mechanical structures is a subject of active development and research. A few vibration‐based methods have been developed so far, requiring, for example, modal parameter estimates in the reference and damaged states of the investigated structure, and for localization in addition a finite element model. For structures in operation, temperature has been shown to be a major nuisance to the efficiency of such methods because the modal parameters are varying not only with damage but also due to temperature variations. For detection, a few rejection approaches have been developed. Besides the increased complexity, environmental variation is hardly taken into account in localization approaches. In this paper, we propose a sensitivity‐based correction of the identified modal parameters in the damaged state with respect to the temperature field in the reference state, on the basis of a sensitivity analysis with respect to temperature dependent parameters of the finite element model in the reference state. The approach is then applied to the stochastic dynamic damage locating vector method, where its improved performance under nonuniform temperature variations is shown in a numerical application on a beam.