MW级复合材料风电叶片的振动特性与应力分布

针对目前风电叶片有限元模型存在铺层不合理的问题,以某1.5 MW风电叶片为研究对象,利用Solidworks软件生成叶片三维模型;再将其导入大型有限元软件Abaqus中,按照叶片铺层理论进行分区域铺层,生成叶片有限元模型,使其更接近叶片的真实铺层状况;在有限元数值计算中,分析了叶片的振动特性以及在50 m/s的极限风速下的应力分布特征.结果表明,叶片模型在模态、强度、刚度三个方面均满足设计要求,叶片的危险截面位于距叶尖约13处,应力主要分布于叶片展向的13~23处,且主要承载结构为主梁和腹板.

Vibration characteristics and stress distribution of MW grade composite wind turbine blades

In view of the unreasonable lamination in the finite element model of wind turbine blades at present, taking a 1.5 MW wind turbine blade as the research object, Solidworks software is used to generate three-dimensional model of blades, which is then imported into thelarge-scale finite element software Abaqus, and the zonal lamination can be generated according to the theory of blade lamination.The finite element model of the blade is used to make it closer to the true lamination condition of the blade. In the finite element numerical calculation, vibration characteristics of the blades and stress distributions in the blades under the limit wind speed of 50 m/s are analyzed. Our predicted results show that the established blade lamination model meets the design requirements in terms of mode, strength and rigidity. The dangerous section of the blade is located at about 1/3 from the tip of the blade, and the stress is mainly distributed at 1/3~2/3 from the tip of a blade, and the main bearing structure is the main beam and web of a blade.