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FBG sensors and signal-based detection method for failure detection of an offshore wind turbine grouted connection

: Müller, N.; Kraemer, P.; Leduc, D.; Schoefs, F.

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International journal of offshore and polar engineering 29 (2019), No.1, pp.1-7
ISSN: 1053-5381
Journal Article, Electronic Publication
Fraunhofer IWES ()

A fatigue test has been conducted on a large-scale offshore wind turbine grouted connection specimen at the Leibniz University of Hannover. For detecting damages in the grouted joint, a structural health monitoring (SHM) system based on fiber optic sensor-type fiber Bragg grating (FBG) has been implemented. By extracting the features of the FBG signal responses using the Wigner–Ville distribution (WVD) and one of its marginal properties, the energy spectral density (ESD), it is possible to detect the occurrence and the global severity of the damage. Some information about the local severity of the damage has also been obtained.