On the use of mode shape curvatures for damage localization under varying environmental conditions
Open access
Date
2018-04Type
- Journal Article
Abstract
A novel damage localization method is introduced in this study, which exploits mode shape curvatures as damage features, while accounting for operational variability. The developed framework operates in an output-only regime,that is, it does not assume availability of records from the influencing environmental/operational quantities but rather from response quantities alone. The introduced tool comprises 3 stages pertaining to training, validation, and diagnostics. During the training stage, a representation of the healthy, or baseline, structural state is acquired over varying operational conditions. A data matrix is formulated, whose individual columns correspond to mode shape curvatures at distinct operational conditions, and principal component analysis (PCA) is applied for extraction of the imprints of separate operational sources on these curvatures. To this end, a residual matrix between the original and the PCA mapped data is formed serving for statistical characterization of each mode. Subsequently, during the validation and diagnostics stages, the mode shape curvature matrices for the currently inspected structural state are assembled and the same PCA mapping is enforced. A typical hypothesis test and a corresponding damage index are then adopted in order to firstly detect damage, and to secondly localize damage, should this exist. The implementation of the proposed method in 2 numerical case studies confirms its effectiveness and the encouraging results suggest further investigation on operating structural systems. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000237582Publication status
publishedExternal links
Journal / series
Structural Control and Health MonitoringVolume
Pages / Article No.
Publisher
WileySubject
damage detection and localization; environmental and operational variability; mode shape curvature; principal component analysis; structural health monitoringOrganisational unit
03890 - Chatzi, Eleni / Chatzi, Eleni
Notes
Funded by Albert Lück foundationMore
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