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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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On the long-term stability of normal condition for damage detection in a composite panel

Manson, G. and Pierce, S.G. and Worden, K. (2001) On the long-term stability of normal condition for damage detection in a composite panel. Key Engineering Materials, 204. pp. 359-369. ISSN 1013-9826

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Abstract

Novelty detection provides an effective strategy for carrying out the lowest level of damage identification. The idea is to create a model of normal condition based on data measured when the system is known to be undamaged and then examine subsequent data to see if there are statistically significant deviations from normality. Problems arise with this approach if the normal condition data varies with the environmental conditions. If the object is simply to detect significant change, variation between different normal conditions with differing environments must be factored out. The current paper examines the problem of environmental change for the situation where a composite panel is monitored for damage under changing conditions of humidity. A previous investigation was concerned with variation in temperature and, for the purpose of comparison, a set of temperature cycling tests was included at the end of the humidity experiment. The features used for detection are measurements of Lamb wave profiles and the detection method is outlier analysis. The exercise is carried out experimentally and the controlled conditions are provided by an environmental chamber.