Abstract
The present work researches on the definition of the load spectra used for offshore wind turbine low SN slope materials’ fatigue design. Uncertainty in the sample sized used to scale fatigue life is analyzed for the tower component. Damage density is investigated for different environmental conditions in order to understand the importance of the different regimes of operation. Damage density is identified to be a heterogeneous function of the loading environmental conditions. In some cases, even for low SN slope materials, most of the damage occurs due to high load ranges. To study on the influence of this heterogeneity, different statistical tail fits are used to compare the influence of accurately defining the tail region on a reference design time (T). Results show that OWT fatigue is highly dependent on the t shorter that T time used to approximate T. This is mainly related to the fact that fatigue design depends not only on scaling stress ranges, but also cycle counts. Effort on the design phase should be applied in the definition of the uncertainty of the load spectra due to the limitation imposed by using low sample sizes to cover the extensive joint distribution of environmental parameters.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Sutherland HJ (1999) On the fatigue analysis of wind turbines. Technical report. Sandia National Labs, Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Lange CH (1999) Probabilistic fatigue methodology and wind turbine reliability. Technical report. Sandia National Labs, Albuquerque, NM, United States
Moriarty PJ, Holley W, Butterfield S (2004) Extrapolation of extreme and fatigue loads using probabilistic methods. National Renewable Energy Lab, Golden, CO (US)
IEC (2005) Wind turbines part 1: Design requirements. Technical report 61400-1, International Electrotechnical Commission, Geneva, Switzerland
IEC (2009) Wind turbines part 3: Design requirements for offshore wind turbines. Technical report 61400-3, International Electrotechnical Commission, Geneva, Switzerland
Jonkman J, Butterfield S, Musial W, Scott G (2009) Definition of a 5-mw reference wind turbine for offshore system development. National Renewable Energy Laboratory, Golden, CO, Technical Report No. NREL/TP-500-38060
Veldkamp HF (2006) Chances in wind energy: a probabilistic approach to wind turbine fatigue design
Teixeira R, O’Connor A, Nogal M, Krishnan N, Nichols J (2017) Analysis of the design of experiments of offshore wind turbine fatigue reliability design with kriging surfaces. Procedia Struct Integr 5:951–958
Embrechts P, Resnick S, Samorodnitsky G (1999) Extreme value theory as a risk management tool. N Am Actuar J 3(2):30–41
Teixeira R, Nogal M, O’Connor A (2018) On the suitability of the generalized Pareto to model extreme waves. J Hydraul Res 56(6):755–770
Acknowledgements
This project has received funding from the European Union Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 642453.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Switzerland AG
About this paper
Cite this paper
Teixeira, R., Nogal, M., O’Connor, A. (2019). On the Calculation of Offshore Wind Turbine Load Spectra for Fatigue Design. In: Correia, J., De Jesus, A., Fernandes, A., Calçada, R. (eds) Mechanical Fatigue of Metals. Structural Integrity, vol 7. Springer, Cham. https://doi.org/10.1007/978-3-030-13980-3_49
Download citation
DOI: https://doi.org/10.1007/978-3-030-13980-3_49
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-13979-7
Online ISBN: 978-3-030-13980-3
eBook Packages: EngineeringEngineering (R0)