Study on the Rotation Effect on the Modal Performance of Wind Turbine Blades

Yewen Chen, Shuni Zhou, Chang Cai, Weilong Wang, Yuheng Hao, Teng Zhou, Xinbao Wang and Qingan Li
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Yewen Chen: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Shuni Zhou: GuangDong HaiZhuang Offshore WindPower Research Center Co., Ltd., Zhanjiang 524100, China
Chang Cai: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Weilong Wang: GuangDong HaiZhuang Offshore WindPower Research Center Co., Ltd., Zhanjiang 524100, China
Yuheng Hao: GuangDong HaiZhuang Offshore WindPower Research Center Co., Ltd., Zhanjiang 524100, China
Teng Zhou: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Xinbao Wang: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Qingan Li: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2023, vol. 16, issue 3, 1-11

Abstract: With the large-scale development of wind turbines, large flexible blades bear heavier loads. In the actual rotating work of blades, the coupling of structural deformation and motion produces a dynamic stiffening effect and spin softening effect, which affects the dynamic characteristics of blades. In this study, the finite element method is used to model the NREL 5MW blade, and the dynamic stiffening and spin softening effects are investigated using the modal analysis. The influence of rotating effects on the blade’s natural frequency is revealed. It is concluded that the effect of dynamic stiffening is more significant than that of spin softening, and the comprehensive result of the two effects is not simply the superposition of them but presents obvious nonlinearity.

Keywords: wind turbine blades; dynamic stiffening; spin softening; modal analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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