A FBG-Based Robust Damage Identification Approach Considering Environmental and Operational Conditions Effects

Abstract:

This paper researches a robust damage identification system considering the effects of the environmental and operational conditions based on distributed fiber Bragg grating system. Initially a well-verified method is used to identify damage, but the failure result is obtained. The environmental and operational variations causing the false-positive indication are analyzed, such as the temperature, the change of the excitation and the relaxation phenomenon of the sensors. The Hilbert-Huang Transform method is used to decompose the dynamic strain signal into several intrinsic mode function components, the physical meanings of which are discussed. Then the second level component is used as the damage-induced signal component. Lastly the damage index based on the autoregressive model and Mahalanobis distance is constructed to detect and locate damage.

• Periodical: Applied Mechanics and Materials (Volumes 556-562)
• Pages: 3255-3258
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.556-562.3255
• Online since: May 2014
• Authors: Yan Hui Zhang*, Wen Yu Yang
• Keywords: Damage Detection, Damage Location, Fiber Bragg Grating, Hilbert-Huang Transform, Structural Health Monitoring (SHM)

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