极限载荷下风力发电机轮毂损伤分析

Damage analysis of wind turbine hub under random ultimate load

针对传统风力发电机轮毂服役载荷环境的不确定性和多样性,在极限载荷下进行风力发电机轮毂损伤研究和结构优化.首先,按叶片坐标系对轮毂模型施加极限载荷,得到轮毂应力云图,求解轮毂在极限工况下的强度;然后,结合S-N曲线和Miner累积损伤准则对轮毂等效应力进行平均应力修正,求解轮毂表面的损伤变化规律;最后,对轮毂结构进行结构拓扑优化,并对优化后的轮毂进行重新建模和静强度分析.结果表明:结构优化后轮毂质量减少9.2%,满足强度要求,为后续轮毂结构优化提供理论基础.

In view of the uncertainty and diversity of traditional wind turbine hubs load environment,the damage of wind turbine hubs under ultimate load was studied,then the structure was optimized.Specifically,the ultimate load is exerted to the turbine hub according to the blade coordinate system to obtain the strength of the hub under the ultimate working condition,the stress nephogram of hub was obtained and the strength of the hub under the ultimate working condition was solved.Then,for the variational law of the damage on the hub surface,the S-N curve and the Miner cumulative damage criterion were combined to correct the average stress of the equivalent stress of the hub.Finally,the topology structure of the hub was optimized,the optimized hub was remodeled and the static strength analysis was carried out.The results indicated that the optimized hub mass was decreased by 9.2%,which met the strength requirements and provided a theoretical basis for subsequent hub structure optimization.