风电叶片延长节结构胶疲劳有限元分析方法研究

Fatigue finite element analysis method research of wind turbine extending bladed structural adhesive

风电叶片延长是在低风速区提高风力发电机年发电量最有效的方法,目前普遍采用结构胶粘接的方式实现叶片与延长节的连接,其疲劳性能决定了延长节运行的稳定性,高效准确的疲劳分析方法对工程应用尤为重要。为此,通过有限元方法,分别建立了全尺寸壳单元、叶尖局部实体单元和全尺寸壳与实体单元结合模型。研究结果表明,应变等效剪切应力的方法偏于保守,而壳与实体单元结合模型方法是一种相对高效准确的风电叶片延长节结构胶疲劳强度分析方法。基于此方法计算了某实际运行风电叶片延长节结构胶的疲劳强度,满足GL标准要求。

The extending blades of wind turbine is the most effective way to improve the annual power generation in low speed wind. At present, the connection of the blades and extension is generally achieved by structural adhesive. The fatigue performance determines the stability of extending blades, and an efficient and accurate analysis method is especially important for engineering application. To this end, the shell element, the solid element, the shell & solid element model are built by the finite element method. The results show that the strain equivalent shear stress method is conservative, and the shell & solid element model is a relatively efficient and exact method for analyzing wind turbine blades extension structural adhesive fatigue strength. Based on this method, the fatigue strength of wind turbine blades extension structural adhesive is satisfied with GL 2010.