风力机复合材料柔性叶片的颤振分析  

Flutter analysis of composite flexible wind turbine blades

作　　者：任勇生[1] 杜向红[1] 杨树莲[2] 

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266510 [2]山东工商学院,山东烟台264005

出　　处：《振动与冲击》2011年第9期64-69,128,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(10972124);山东省自然科学基金(Y2006F37);山东省教育厅科技计划(J08LB04)资助项目

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。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 momentum（BEM） theory and quasi-steady airfoil aerodynamics.The Galerkin＇s method was employed in order to solve the coupled differential equations.Aeroelastic stability was investigated through eigenvalue analysis.Numerical results were obtained for the blades with circumferentially antisymmetric stiffness（CAS） configuration.The effects of the fiber orientation,pretwist angle and inflow on blade aeroelastic stability were investigated.

关 键 词：气动弹性 复合材料 薄壁梁 风力机叶片 预扭转角 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]