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SHM of floating offshore wind turbines - challenges and first solutions

: Friedmann, H.; Ebert, C.; Krämer, P.; Frankenstein, B.; Schubert, L.

Boller, Christian (Ed.) ; Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. -DGZfP-, Berlin; Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren -IZFP-, Saarbrücken:
Structural health monitoring 2012. Sixth European Workshop on Structural Health Monitoring. Proceedings. Vol.2 : 1st European Conference of the Prognostics and Health Management (PHM) Society, held at Dresden, Germany, July 3-6, 2012
Berlin: DGZfP, 2012 (DGZfP-Berichtsbände 135)
ISBN: 978-3-940283-41-2
European Workshop on Structural Health Monitoring (EWSHM) <6, 2012, Dresden>
Prognostics and Health Management Society (PHM European Conference) <1, 2012, Dresden>
Conference Paper
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

The paper presents an integrated SHM-system for floater, moorings, tower, nacelle and rotor blades. Its core is based on a multivariate SHM-system for rotor blades with three different measuring techniques accompanied by appropriate signal processing approaches:
- Acoustic Emission (AE) is used for identification of relative small damages at the whole blade, e.g. bursts of fibres, cracks of bonding, hits of hail and the localization of damages.
- Acousto Ultrasonics (AU) provides information about relative small to big damages on the transfer path between emitter and receiver of guided waves (cracks, delamination, damages of the surface).
- Operational Modal Analysis (OMA) gives information about large structural modifications e.g. changes of global stiffness, mass and damping ratios in the whole blade.
The most important feature of an SHM-system, however, is not the sensor network, but the analysis capability and the decision support system reducing and interpreting measured data. The instrumentation plan of a floating wind turbine off the coast of Spain is presented.