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Features for damage detection with insensitivity to environmental and operational variations

Cross, Elizabeth and Manson, Graham and Worden, Keith and Pierce, Stephen (2012) Features for damage detection with insensitivity to environmental and operational variations. Proceedings A: Mathematical, Physical and Engineering Sciences. ISSN 1364-5021 (In Press)

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Abstract

This paper explores and compares the application of three different approaches to the data normalization problem in structural health monitoring (SHM), which concerns the removal of confounding trends induced by varying operational conditions from a measured structural response that correlates with damage. The methodologies for singling out or creating damage-sensitive features that are insensitive to environmental influences explored here include cointegration, outlier analysis and an approach relying on principal component analysis. The application of cointegration is a new idea for SHM from the field of econometrics, and this is the first work in which it has been comprehensively applied to an SHM problem. Results when applying cointegration are compared with results from the more familiar outlier analysis and an approach that uses minor principal components. The ability of these methods for removing the effects of environmental/operational variations from damage-sensitive features is demonstrated and compared with benchmark data from the Brite-Euram project DAMASCOS (BE97 4213), which was collected from a Lamb-wave inspection of a composite panel subject to temperature variations in an environmental chamber.

Item type: Article
ID code: 41881
Keywords: damage detection , insensitivity, environmental variations, operational variations, Electrical engineering. Electronics Nuclear engineering, Physics and Astronomy(all), Engineering(all), Mathematics(all)
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Technology and Innovation Centre > Sensors and Asset Management
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Depositing user: Pure Administrator
Date Deposited: 02 Nov 2012 05:46
Last modified: 27 Mar 2014 10:37
URI: http://strathprints.strath.ac.uk/id/eprint/41881

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