风力机复合材料柔性叶片的颤振分析

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (9) : 64-69.

论文

风力机复合材料柔性叶片的颤振分析

任勇生1; 杜向红1; 杨树莲2

作者信息 +

Flutter analysis of composite flexible wind turbine blades

Ren Yong-sheng1; Du Xiang-hong1; Yang Shu-lian2

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摘要

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。

Abstract

Wind turbine blades are flexible structures that can often be modeled as anisotropic composite thin-walled beams, exhibiting bending-twist coupling. The equations of motion for a single wind turbine blade are derived using Hamilton’s principle and a variational-asymptotical method(VAM). The structural model includes anisotropy, warping function, centrifugal loads, precone and pretwist angle. The aerodynamic loads are determined based on blade element momentum (BEM) theory and quasi-steady airfoil aerodynamics. The Galerkin’s method is employed in order to solve the coupled differential equations. Aeroelastic stability is investigated through eigenvalue analysis. Numerical results are obtained for the blades with Circumferentially Antisymmetric Stiffness (CAS) configuration, the effects of the fiber orientation, pretwist angle and inflow on blade aeroelastic stability are investigated.

Key words

Aeroelastic / composite / thin-walled beams / wind turbine blade / pretwist and precone angle

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任勇生;杜向红;杨树莲. 风力机复合材料柔性叶片的颤振分析[J]. 振动与冲击, 2011, 30(9): 64-69

Ren Yong-sheng;Du Xiang-hong;Yang Shu-lian . Flutter analysis of composite flexible wind turbine blades[J]. Journal of Vibration and Shock, 2011, 30(9): 64-69