兆瓦级风力发电机组主轴优化设计

Research about structure optimization on main shaft of MW wind turbine

主轴作为风力发电机组传动链系统中的核心部件,其结构强度对整个机组的安全、稳定运行有着至关重要的影响。针对某4 MW双馈式风力发电机组主轴,根据其结构形式和载荷传递特点,利用参数化建模语言,以仅受压属性的杆单元模拟主轴轴承滚子,建立了有限元分析模型。依据GL2010认证规范,推导出考虑主轴平均应力效应的S-N曲线,并根据轮毂中心处的极限工况载荷与疲劳时序载荷,进行主轴静强度和疲劳损伤计算,结果显示主轴的静强度满足设计要求,疲劳强度需要优化提升,针对上述结果从结构刚度协调性和表面粗糙度两方面进行优化设计研究,最终,在保证主轴满足强度要求的同时,重量降低了约2.23%,实现了轻量化设计。

The main shaft is one of the most important parts of the drive chain system,and the structural strength has a critical impact on the safety and stability of the wind turbine.According to the structure and load transmission characteristics,the FEA model of the main shaft for a 4 MW doubly-fed wind turbine was established by using the parametric modeling language to simulate the roller of main bearing with only compression attribute of the link element.The S-N curves,which reflecting the effect of mean stress,was derived according to GL 2010 certification standards.With the ultimate load and fatigue time series load,the static strength and fatigue damage were calculated,and the results showed that the static strength meets the design requirements and the fatigue strength need to be improved.With the study on stress concentration and surface condition,which are two main factors for fatigue damage,the main shaft optimization scheme which combines stiffness compatibility and surface roughness was finally obtained,and the strength design meets the requirements and the lightweight design was realized,with the weight of the main shaft was reduced about 2.23%.