风力机复合材料柔性叶片的颤振分析

将风力机叶片简化为薄壁复合材料封闭截面弯扭耦合变形梁，基于Hamilton原理并结合变分渐进法（VAM），建立风力机叶片的气动弹性力学模型。结构模型包括材料各向异性，截面翘曲，离心载荷，科里奥利加速度，以及预锥角和预扭转角的影响。气动载荷采用叶素动量理论和准定常气动力理论进行描述。将位移按广义坐标进行模态展开，采用Galerkin法导出系统的质量、刚度和阻尼矩阵，采用特征值技术进行叶片颤振性能的数值求解。针对周向反对称刚度配置（CAS）叶片进行数值近似计算，揭示了入流比、预扭转角和纤维铺层角等参数对风力机叶片颤振性能的影响。

Flutter analysis of composite flexible wind turbine blades

Wind turbine blades are flexible structures that can usually be modeled as anisotropic composite thin-walled beams,exhibiting bending-twist coupling.The equations of motion of a single wind turbine blade were derived by using Hamilton's principle combined with variational-asymptotical method(VAM).In the structural model,the influences of anisotropy,warping function,centrifugal loads,precone and pretwist angle were all taken into account.The aerodynamic loads were determined based on the blade element moment...