Statistical evaluation of characteristic SDDLV-induced stress resultants to discriminate between undamaged and damaged elements

Lasse Majgaard Hansen, Rasmus Johan Johansen, Martin Dalgaard Ulriksen, D. Tcherniak, Lars Damkilde

Research output: Contribution to journalConference article in JournalResearchpeer-review

2 Citations (Scopus)

Abstract

The stochastic dynamic damage location vector (SDDLV) method utilizes the vectors from the kernel of a damaged-induced transfer function matrix change to localize damages in a structure. The kernel vectors associated with the lowest singular values are converted into static pseudo-loads and applied alternately to an undamaged reference model with known stiffness matrix, hereby, theoretically, yielding characteristic stress resultants approaching zero in the damaged elements. At present, the discrimination between potentially damaged elements and undamaged ones is typically conducted on the basis of modified characteristic stress resultants, which are compared to a pre-defined tolerance value, without any thorough statistical evaluation. In the present paper, it is tested whether three widely-used statistical pattern-recognition-based damage-detection methods can provide an effective statistical evaluation of the characteristic stress resultants, hence facilitating general discrimination between damaged and undamaged elements. The three detection methods in question enable outlier analysis on the basis of, respectively, Euclidian distance, Hotelling’s statistics, and Mahalanobis distance. The study of the applicability of these methods is based on experimentally obtained accelerations of a cantilevered residential-sized wind turbine blade subjected to an unmeasured multi-impulse load. The characteristic stress resultants are derived by applying the static pseudo-loads to a representative finite element (FE) model of the actual blade.
Original languageEnglish
Book seriesJournal of Physics: Conference Series (Online)
Volume628
Issue number1
Pages (from-to)1-8
Number of pages8
ISSN1742-6596
DOIs
Publication statusPublished - 2015
EventInternational Conference on Damage Assessment of Structures - Ghent University, Ghent, Belgium
Duration: 24 Aug 201526 Aug 2015
Conference number: 11

Conference

ConferenceInternational Conference on Damage Assessment of Structures
Number11
LocationGhent University
CountryBelgium
CityGhent
Period24/08/201526/08/2015

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