基于ANSYS的大型复合材料风力机叶片结构分析

Structural Analysis of Large-scale Composite Wind Turbine Blade Based on ANSYS

基于ANSYS软件,对某款应用于GL3A风场的1500kW大型复合材料风力机叶片进行了结构分析。分析结果表明:该叶片的振型以一阶挥舞和一阶摆振为主,其频率分别为0.86Hz和1.59Hz;在极限挥舞载荷作用下,该叶片有限元模型计算得到的叶尖挠度为8.445m,而该叶片全尺寸静力试验得到的极限挥舞载荷作用下的叶尖挠度为8.12m,计算值与试验值的误差只有3.8%;另外,该叶片的最大计算拉应力和压应力分别为228MPa和201MPa,而该叶片玻纤/环氧复合材料实测拉伸强度和实测压缩失稳强度分别为720MPa和380MPa,其计算最大应力只有对应实测极限强度的31.7%和52.9%。

Based on the ANSYS software, the structttral analysis of a kind of 1500kW large-scale composite wind turbine blade which applied in GL3A wind farm was carried out. The analysis restdts show that the vibration modes of this blade are mainly presented as first tlapwise mode and first edgewise mode, the frequencies of the vibration are respectively 0.86Hz and 1.59Hz. At the action of ultimate flapwise loads, the FEM analysis results show that the blade tip deformation is 8.445m, while the blade tip defomaation of the full scale blade under static test is 8.12m, so the deviation between the calculated and tested value of the blade tip deformation is only 3.8%. Moreover, the calculated maximum tensile stress and the compressive stress are 228MPa and 201MPa, while the teated tensile strength and compressive buckling strength of the glass-fiber/epoxy composite are 720MPa and 380MPa, respectively. Consequently, the percentages of the calculated maximum stress and the tested ultimate strength are respectively 31.7% and 52.9%.