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Wind and Structures
  Volume 29, Number 6, December 2019, pages 431-440

Influence of structure coupling effect on damping coefficient of offshore wind turbine blades
Jianping Zhang, Zhen Gong, Haolin Li, Mingqiang Wang, Zhiwei Zhang and Fengfeng Shi

    The aim of this study was to explore the influence of structure coupling effect on structural damping of blade based on the blade vibration characteristic. For this purpose, the scaled blade model of NREL 5 MW offshore wind turbine was processed and employed in the wind tunnel test to validate the reliability of theoretical and numerical models. The attenuation curves of maximum displacement and the varying curves of equivalent damping coefficient of the blade under the rated condition were respectively compared and analyzed by constructing single blade model and whole machine model. The attenuation law of blade dynamic response was obtained and the structure coupling effect was proved to exert a significant influence on the equivalent damping coefficient. The results indicate that the attenuation trend of the maximum displacement response curve of the single blade varies more obviously with the increase of elastic modulus as compared to that under the structure coupling effect. In contrast to the single blade model, the varying curve of equivalent damping coefficient with the period is relatively steep for the whole machine model. The findings are of great significance to guide the structure design and material selection for wind turbine blades.
Key Words
    offshore wind turbines; damping coefficient; structure coupling effect; wind tunnel test; elastic modulus
Jianping Zhang and Haolin Li: School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Zhen Gong, Mingqiang Wang and Fengfeng Shi: College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Zhiwei Zhang: Shanghai Green Environmental Protection Energy Co., Ltd, Shanghai 200433, China

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