基于Abaqus的风力叶片屈曲数值分析与模拟

Numerical Analysis and Simulation of Wind Blade Buckling Based on Abaqus

随着风电叶片长度的不断增加,屈曲稳定性验证成为校核叶片可靠性的关键工作。本研究通过观察某90 m级叶片挥舞工况,基于Abaqus有限元软件,探索应用线性特征值及非线性Riks 2种方法对叶片屈曲进行对比分析。分析结果表明,特征值方法得到的屈曲因子为1.978,Riks方法得到的屈曲因子为1.653,均满足IEC61400-5标准,证明了该叶片的可靠性;同时,采用Riks方法可考虑叶片制造误差及几何非线性,能够准确地预测出叶片局部屈曲的位置,可推广于叶片结构校核工作中。

With the increasing length of the wind turbine blade,the buckling stability verification becomes the key work to calibrate the reliability of the blade.This paper takes a 90m-class blade waving condition as the research object.It explores the application of linear eigenvalue and nonlinear Riks two methods to compare and analyze the blade buckling based on Abaqus finite element software.The analysis results show that the buckling factor obtained by the eigenvalue method is 1.978,while the bucking factor obtained by the Riks method is 1.653,both of which satisfy the IEC61400-5 standard.The reliability of the blade design was proved.Meanwhile,the Riks method can take into account the manufacturing error and geometric nonlinearity of the blade and accurately predict the position of the blade's local buckling,which can be popularized in the structural calibration of the blade.