With the development of wind turbine to large-scale and offshore trend, the wind turbine size is becoming increasingly larger. Passive control technique is used to alleviate the increasing loads on the blade for the sake of improve the durability of wind turbine. The ply design of shells considering the coupling effect of bending and torsion is one of the passive control techniques. The bending torsion coupling stiffness is one of the parameters of blade section stiffness matrix. In order to fully understand the influence of each blade stiffness parameter on the aeroelastic responses of wind turbine and to consider the influence of structural characteristics on the aeroelastic responses in blade design, the influences and sensitivity of each stiffness parameter in the 6×6 stiffness matrix of the blade sections on the aeroelastic responses of wind turbine are systematically studied under steady wind condition. The aerodynamic forces in aeroelastic model are calculated by AeroDyn module based on blade element momentum theory and the structural dynamic responses of the blade are calculated using generalized Timoshenko beam theory and geometric exact beam theory. The NREL baseline 5MW wind turbine and blade properties are used in this study, where the diagonal stiffness parameters and non-diagonal stiffness parameters of the matrixes of each blade section are scaled according to certain principles. The results show that the axial stiffness, the flap-wise stiffness and the torsional stiffness in the diagonal are sensitive to the root loads and tip displacement of blade. The flap-wise bending torsion coupling stiffness, the flap-wise shear-torsion coupling stiffness and the edge-wise shear-torsion coupling stiffness in the non-diagonal are also sensitive to the aeroelastic responses. For completeness, the effects of other stiffness parameters on the aeroelastic responses are also analyzed and discussed.

中文翻译：

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叶片截面刚度参数对风力机气动弹性响应影响的敏感性研究

随着风力发电机向大型化和海上化趋势发展，风力发电机的尺寸越来越大。被动控制技术被用来减轻叶片上增加的载荷，以提高风力发电机的耐用性。考虑弯曲和扭转耦合效应的壳体层板设计是一种被动控制技术。弯扭耦合刚度是叶片截面刚度矩阵的参数之一。为充分了解各叶片刚度参数对风力机气动弹性响应的影响，并在叶片设计时考虑结构特性对气动弹性响应的影响，系统研究了稳定风况下叶片截面6×6刚度矩阵中各刚度参数对风力机气动弹性响应的影响和敏感性。气动弹性模型中的气动力基于叶片元动量理论通过AeroDyn模块计算，叶片结构动力响应采用广义Timoshenko梁理论和几何精确梁理论计算。本研究采用NREL基线5MW风电机组和叶片特性，根据一定的原则对每个叶片截面矩阵的对角刚度参数和非对角刚度参数进行缩放。结果表明，轴向刚度，对角线的襟翼刚度和扭转刚度对叶片的根部载荷和叶尖位移敏感。非对角线的襟翼弯曲扭转耦合刚度、襟翼剪切扭转耦合刚度和边缘剪切扭转耦合刚度也对气动弹性响应敏感。为了完整起见，还分析和讨论了其他刚度参数对气动弹性响应的影响。