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Wind and Structures Volume 25, Number 6, December 2017 , pages 569-588 DOI: https://doi.org/10.12989/was.2017.25.6.569 |
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Assembly strategies of wind turbine towers for minimum fatigue damage |
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Cristina Nunez-Casado, Oscar Lopez-Garcia, Enrique Gomez de las Heras, Alvaro Cuerva-Tejero and Cristobal Gallego-Castillo
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| Abstract | ||
| The aim of this paper is to present a method to obtain the dynamic response of a wind turbine tower in time domain by means of the generation of time series and to estimate the associated fatigue damage by means of a Rainflow counting algorithm. The proposed method is based on assuming the vortex shedding is a bidimensional phenomena and on following a classical modal superposition method to obtain the structure dynamic response. Four di erent wind turbine tower geometric con gurations have been analyzed in a range of usual wind velocities and covering extreme wind velocities. The obtained results have shown that, depending on the turbulence intensity and the mean wind velocity, there are tower geometric con gurations more advantageous from the fatigue load standpoint. Consequently, the presented model can be utilized to de ne assembly strategies oriented to fatigue damage minimization. | ||
| Key Words | ||
| vortex shedding; fatigue damage; wind turbine towers; assembly process; rainflow | ||
| Address | ||
| Cristina Nunez-Casado, Oscar Lopez-Garcia, Alvaro Cuerva-Tejero and Cristobal Gallego-Castillo: Departamento de Aeronaves y Vehiculos Espaciales, ETSIAE, Universidad Politecnica de Madrid, Spain Enrique Gomez de las Heras: Siemens Gamesa Renewable Energy | ||