针对风电叶片叶根连接有限元建模方法进行研究,主要通过对比工程算法、整体有限元模型与1/N有限元模型的结果进行分析验证.首先对叶根钻孔连接采用工程算法进行理论计算,得到了螺栓的理论应力.接着分别建立整体模型与1/N模型,并对模型进行加载计算得到螺栓的有限元应力.通过对比发现,有限元与理论结果的偏差较小,从而证明两种建模方法都是可行的.采用整体模型计算与实际最为接近,但采用1/N模型更能减少工作量,提高效率.
Different finite element modeling approaches of root connection for wind turbine blades were studied in this paper.The computed results of the stress level in the connection bolts obtained by two different modeling methods,namely the full-scaled and 1/N scaled FE models,were compared with the results calculated by the theoretical analysis.Hence the theoretical results were calculated first and then the full-scaled and 1/N scaled FE model were modeled and analyzed.The comparison shows that the difference between the theoretical results and the two FEM results is very small,illustrating that both of the two modeling approaches are acceptable in terms of obtaining reasonable results.Further study also shows that the full-scaled model is closer to the reality,but setting up the 1/N scaled model requires less modeling work and is therefore more efficient.
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