Influence of Wind Induced Fatigue Damage in the Reliability of Wind Turbines

Authors: Emilio A. Berny-Brandt, Sonia E. Ruiz

Abstract:

Steel tubular towers serving as support structures for large wind turbines are subjected to several hundred million stress cycles caused by the turbulent nature of the wind. This causes highcycle fatigue, which could govern the design of the tower. Maintaining the support structure after the wind turbines reach its typical 20-year design life has become a common practice; however, quantifying the changes in the reliability on the tower is not usual. In this paper the effect of fatigue damage in the wind turbine structure is studied whit the use of fracture mechanics, and a method to estimate the reliability over time of the structure is proposed. A representative wind turbine located in Oaxaca, Mexico is then studied. It is found that the system reliability is significantly affected by the accumulation of fatigue damage. 

Keywords: Crack growth, fatigue, Monte Carlo simulation, structural reliability, wind turbines

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1100831

References:

[1] J. D. Holmes, Wind loading of structures. 2007, pp. 1–28, 50–73.
[2] T. Burton, N. Jenkins, D. Sharpe, and E. Bossanyi, Wind Energy Handbook (Google eBook). 2011, pp. 11–38.
[3] IEC-61400-1, “Wind Turbines - Part 1: Design Requirements,” 2005.
[4] ESDU, “Characteristics of atmospheric turbulence near the ground Part III : variations in space and time for strong winds ( neutral atmosphere ),” no. October 1986, 2001.
[5] G. Solari, “Turbulence Modeling for Gust Loading,” Journal of Structural Engineering, vol. 113, no. 7. pp. 1550–1569, 1987.
[6] P. S. Veers, “Three-Dimensional Wind Simulation,” pp. 1–36, 1988.
[7] W. a Timmer, “Aerodynamic characteristics of wind turbine blade airfoils at high angles-of-attack,” TORQUE 2010 Sci. Mak. Torque from Wind, no. 1, pp. 71–78, 2010.
[8] M. A. Miner, “Cumulative damage in fatigue,” J. Appl. Mech., vol. 12, no. 3, pp. 159–164, 1945.
[9] P. C. Paris and F. Erdogan, “A critical analysis of crack propagation laws,” J. Basic Eng., vol. 85, pp. 528–534, 1963.
[10] a A. Næss, “Fatigue Handbook,” Offshore Steel Struct. TAPIR, vol. 224, 1985.
[11] K. H. Lee and D. V Rosowsky, “Fragility curves for woodframe structures subjected to lateral wind loads,” vol. 9, no. 3, pp. 217–230, 2006.
[12] F. Jalayer and C. A. Cornell, “A Technical Framework for ProbabilityBased Demand and Capacity Factor Design ( DCFD ) Seismic Formats A Technical Framework for Probability-Based Demand and Capacity Factor Design ( DCFD ) Seismic Formats,” Engineering, 2003.
[13] J. Jonkman, S. Butterfield, W. Musial, and G. Scott, “Definition of a 5- MW reference wind turbine for offshore system development,” Contract, no. February, pp. 1–75, 2009.
[14] C. Lindenburg, D. Winkelaar, and E. L. Van Der Hooft, “DOWEC 6 MW PRE-DESIGN Aero-elastic modelling of the DOWEC 6 MW predesign in PHATAS Acknowledgement / Preface,” no. September, pp. 1– 46, 2003.
[15] K. S. Hansen, K. Ole, and H. Pedersen, “Online wind turbine measurement laboratory.,” Main, no. March, pp. 1–8, 2006.
[16] O. a. Jaramillo and M. a. Borja, “Wind speed analysis in La Ventosa, Mexico: A bimodal probability distribution case,” Renew. Energy, vol. 29, pp. 1613–1630, 2004.
[17] W. B. Dong, Z. Gao, and T. Moan, “Fatigue reliability analysis of jacket-type offshore wind turbine considering inspection and repair Abstract :
[18] Bs-7910, “Guide to methods for assessing the acceptability of flaws in metallic structures,” BSI Stand. Publ., vol. 3, p. 306, 2005.