摘要
以某国产660 MW超临界汽轮发电机组轴系为对象,重点计算和讨论了轴系特定结构(如阶梯轴、整锻轮盘)的扭转刚度及其对扭振特性的影响。首先推导了阶梯轴不参与完全变形材料长度λ的计算公式,确定了λ的取值范围在0～0.125d1之间,进而提出转轴直径突变处不参与完全变形材料的刚度模化方法,将整锻轮盘和阶梯轴的处理统一起来。对某国产660 MW汽轮发电机组轴系的计算结果表明,采用本文推导的公式和模化方法来处理轴系结构所得到的扭振频率与用经验方法得到的结果吻合。这种算法的特点是便于计算机编程,可保证计算精度。
With a domestically-made 660 MW supercritical steam turbine generator unit serving as an object of study,the torsion rigidity of shafting specific structures(such as stepped shaft,wholly-wrought wheel disks) and its effect on torsion vibration were calculated and discussed as a major focus.The formulae for calculating the material length λ in the stepped shaft not involved in the complete distortion was first derived with the λ value being determined in a range from 0 to 0.125 d1.Then,a rigidity modeling method was presented for the material not involved in the complete distortion where there is an abrupt change in shaft diameter,unifying the treatment of the wholly-wrought rotor and stepped shaft.The calculation results of the shafting of a domestically-made 660 MW turbo-generator unit in a power plant indicate that the torsional vibration frequency obtained as a result of treating the shafting structure by using the derived formulae and modeling method under discussion is in good agreement with the result of empirical methods.The algorithm involved is characterized by its convenience for computer programming and assurance of a high calculation accuracy.
出处
《热能动力工程》
CAS
CSCD
北大核心
2007年第2期146-148,共3页
Journal of Engineering for Thermal Energy and Power
关键词
汽轮发电机组
阶梯轴
整锻轮盘
刚度
扭振
turbo-generator unit,stepped shaft,wholly-wrought wheel disk,rigidity,torsional vibration
