风力机叶片根部孔缺陷应力分析

大型风力发电机的叶片几乎都是复合材料加工而成,由于各种原因,叶片在加工过程可能会出现各种质量问题。以1.5MW根部T型螺栓孔打孔损伤叶片为例,应用ANSYS软件建立了叶片根部与T型螺栓的有限元模型。对其根部和T型连接螺栓进行了受力分析,并分别比较了正常结构和损伤结构两种情况下叶片根部T型螺栓孔和螺栓的应力。计算结果表明,叶片根部缺陷孔应力还处在可接受范围内,对T型螺栓的受力也影响不大,受损叶片可通过进一步补强后正常使用。

Stress analysis for blade root of wind turbine

Blades of large wind turbine are almost made from composite material,for various reasons,many kinds of quality problems may appear in the blades processing.A 1.5MW wind turbine blade with a damaged hole at root was taken as an example,and a FE model for blade root of wind turbine and T-bolts was established by ANSYS.Then the stress of the root and T-bolts were analyzed,and the stress of the root T-bolt holes and bolts were compared under the condition of the normal structure and the damaged structure respectively.The results show that the stress of the T-bolt hole in the damaged blade root is still within the acceptable stress range,which effect of the damaged hole on T-bolt’s stress is little.Thus the damaged blade might be used normally after being reinforced further.