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Effects of Second-Order Difference-Frequency Wave Forces on Floating Wind Turbine Under Survival Condition

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Abstract

In this paper, the effects of second-order difference-frequency wave forces on the global motion of an offshore wind turbine system with a large displacement under the survival condition are studied. In this case, the hydrodynamic force is the main force because the blades are feathered to reduce the lifting force. The first-order hydrodynamic forces are calculated by WADAM, while the second-order wave forces are calculated by a customized MATLAB module. Then the hydrodynamic coefficients are transferred to the wind turbine analytical code FAST. Through the comparisons of dynamic responses between the first- and second-order numerical models, it is found that the second-order wave forces significantly influence the motion of floating wind turbine under the survival condition. Moreover, neglecting the second-order force significantly underestimates the tension forces in the mooring lines.

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Acknowledgements

This study was supported by National Natural Science Foundation of China (No. 51479134), Fund for Creative Research Groups (No. 51321065).

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Authors and Affiliations

  1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300354, China

    Jiawen Li, Yougang Tang, Xiaoqi Qu & Jiawei Zhai

  2. Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA, 94720-1740, USA

    Yichen Jiang

Authors
  1. Jiawen Li
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  2. Yichen Jiang
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  3. Yougang Tang
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  4. Xiaoqi Qu
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  5. Jiawei Zhai
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Correspondence to Yougang Tang.

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Li, J., Jiang, Y., Tang, Y. et al. Effects of Second-Order Difference-Frequency Wave Forces on Floating Wind Turbine Under Survival Condition. Trans. Tianjin Univ. 23, 130–137 (2017). https://doi.org/10.1007/s12209-017-0037-2

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  • DOI: https://doi.org/10.1007/s12209-017-0037-2

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