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Effects of bend-twist coupling on flutter limits of composite wind turbine blades

机译：弯扭耦合对复合材料风力涡轮机叶片颤动极限的影响

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摘要

The effects of bend-twist coupling on the flutter limits of large composite wind turbine blades are investigated in this work. A mixed, geometrically exact, and nonlinear finite element for anisotropic beams is developed based on Hellinger-Reissner variational principle. The nonlinear beam model is combined with Blade Element Momentum method and an unsteady dynamic stall model to perform flutter analysis of composite blades. A 5-MW composite wind turbine blade with shallow-angled skins is studied, where unbalanced laminates (i.e. ply angle and ply thickness unbalances) are implemented to introduce the bend-twist coupling in the blade through material anisotropy. The results show that with bend-twist coupling due to geometrical nonlinearities, the predicted flutter limits are around 23% lower than the same predicted in linear flutter analysis. The unbalanced skin laminates show no significant influence on the flutter limits of the blade in nonlinear flutter analysis.
机译：在这项工作中，研究了弯扭耦合对大型复合材料风力涡轮机叶片颤振极限的影响。基于Hellinger-Reissner变分原理，开发了一种混合的，几何精确的非线性各向异性梁有限元。非线性梁模型与叶片单元动量法和非稳态动态失速模型相结合，对复合材料叶片进行颤振分析。研究了具有浅角蒙皮的5兆瓦复合材料风力涡轮机叶片，其中采用了不平衡的层压板（即帘布层角度和帘布层厚度不平衡），以通过材料各向异性在叶片中引入弯扭耦合。结果表明，由于几何非线性导致的弯曲扭曲耦合，预测的颤动极限比线性颤动分析中的预测颤动极限低约23％。在非线性颤振分析中，不平衡的蒙皮层压板对叶片的颤振极限没有显着影响。

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  • 来源
    《Composite Structures》 |2018年第5期|317-326|共10页
  • 作者

    Zhou Xiandong; Huang Kefu; Li Zheng;

  • 作者单位

    Peking Univ, Coll Engn, Dept Mech & Engn Sci, Beijing 100871, Peoples R China;

    Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China;

    Peking Univ, Coll Engn, Dept Mech & Engn Sci, Beijing 100871, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Composite blade; Unbalanced laminate; Bend-twist coupling; Flutter;

    机译：复合材料叶片;不平衡层压板;弯曲扭曲耦合;颤振;

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