Study on fatigue life of bend-twist coupling wind turbine blade based on anisotropic beam model and stress-based fatigue analysis method
Study on fatigue life of bend-twist coupling wind turbine blade based on anisotropic beam model and stress-based fatigue analysis method
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DOI：
10.1016/j.compstruct.2018.10.032
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发表时间：
2019-01-15
影响因子：
6.3
通讯作者：
Geiger, Paul
中科院分区：
文献类型：
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作者：
Meng, Hang;Lien, Fue-Sang;Geiger, Paul
弯扭耦合（BTC），也称为气动弹性剪裁或被动变桨距控制方法，常用于降低风力涡轮机叶片的疲劳载荷。使用BTC时，叶片可以在弯曲时扭曲，这在负载突然增加时由于攻角减小而减小了气动力。在本研究中，基于应力的方法被用来研究在不同的尾流条件下由于BTC效应引起的疲劳载荷。开始，气动弹性模拟采用一维各向异性梁模型。然后对NREL 5 MW风力涡轮机叶片进行了不同纤维取向的静力和模态分析，以验证各向异性梁模型的正确性。最后，利用DTU BECAS软件重建了每个截面上每个单元的应力历史。分析了不同尾流条件下，各截面不同材料的疲劳寿命。结果表明，NREL 5 MW涡轮机叶片的疲劳寿命预测值（26.0187年）与设计寿命（20年）非常接近。疲劳效应对涡轮机叶片的寿命有一定影响，这种影响受风轮机布置方式的影响，并可通过BTC效应得到缓解。
Bend-twist coupling (BTC), also called aeroelastic tailoring or passive pitch control method, is often utilized to reduce the fatigue loading on wind turbine blades. With BTC, the blade can twist as it bends, this alleviates the aerodynamic force due to the decrease in the angle of attack when the load is increased suddenly. In this research, the stress-based method is employed to investigate the fatigue load due to the BTC effect under different wake conditions. To begin with, the one-dimensional anisotropic beam model is adopted in aeroelastic simulation. Next the static and modal analyses for the NREL 5 MW wind turbine blade with different fiber orientations are performed to verify the anisotropic beam model. Finally, the stress history of each element on each cross section is reconstructed using DTU BECAS. The fatigue life of different materials in each cross section under different wake conditions has been analysed. The results show that the predicted fatigue life of NREL 5 MW wind turbine blade (26.0187 years) is very close to the design life (20 years). The fatigue effect has an impact on the life of wind turbine blades, which can be affected by the layout of wind turbines and alleviated by BTC effect.