Articles | Volume 2, issue 2
Brief communication
12 Sep 2017
Brief communication |  | 12 Sep 2017

Brief communication: Structural monitoring for lifetime extension of offshore wind monopiles: can strain measurements at one level tell us everything?

Lisa Ziegler, Ursula Smolka, Nicolai Cosack, and Michael Muskulus

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Cited articles

Cosack, N.: Fatigue load monitoring with standard wind turbine signals, PhD thesis, Universität Stuttgart, Germany, 2011.
Devriendt, C., Weijtjens, W., El-Kafafy, M., and De Sitter, G.: Monitoring resonant frequencies and damping values of an offshore wind turbine in parked conditions, IET Renew. Power Gen., 8, 433–441, 2014.
DNVGL: Fatigue design of offshore steel structures, Recommended practice RP-C203, 2016.
Ersdal, G. and Hörnlund, E.: Assessment of offshore structures for life extension, In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering, American Society of Mechanical Engineers, 2008.
Fallais, D. J. M., Voormeeren, S., and Lourens, E.: Vibration-based Identification of Hydrodynamic Loads and System Parameters for Offshore Wind Turbine Support Structures, Energy Procedia, 94, 191–198,, 2016.
Short summary
The first larger offshore wind farms are reaching a mature age. Operators have to take actions for monitoring now in order to have accurate knowledge on structural reserves later. This knowledge is important to make decisions on lifetime extension. Many offshore wind turbines have one set of strain gauges already installed at the transition piece. We present a simple and robust method to extrapolate these measurements to other locations of the monopile without need of additional instrumentation.