Abstract: In the alignment calculation process for propulsion shafting systems equipped with shaft-mounted generators, the unbalanced magnetic pull (UMP) is often overlooked, leading to deviations and reduced accuracy in the alignment results. To investigate the influence of the UMP of a shaft-mounted generator on the dynamic alignment of a propulsion shafting system, a finite element model for shafting alignment was established based on a simplified modeling principle. Dynamic alignment analyses were conducted under various conditions: without a shaft-mounted generator, with a shaft-mounted generator but without considering UMP, and with a shaft-mounted generator while considering different UMP values. A comparative analysis of the calculation results was performed. The results demonstrate that the UMP of the shaft-mounted generator affects the shaft deflection, stress, and the load on adjacent bearings. The research findings provide valuable guidance and reference for the accurate alignment calculation of propulsion shafting systems equipped with shaft-mounted generators.

Key words: propulsion shafting, dynamic alignment, unbalanced magnetic pull (UMP), shaft-mounted generator, finite element method (FEM)

摘要： 在配置抱轴发电机的推进轴系校中计算中,抱轴发电机不平衡磁拉力这一因素常被忽视,导致轴系校中计算结果偏差、精度降低。为了研究抱轴发电机不平衡磁拉力对推进轴系动态校中的影响,该文基于轴系校中简化原则,采用有限元法建立轴系校中计算模型,分别开展了不带抱轴发电机、带抱轴发电机但不考虑磁拉力、带抱轴发电机且考虑不同磁拉力等工况的轴系动态校中,并对计算结果进行对比分析。结果表明：抱轴发电机不平衡磁拉力对轴系挠度、应力和相邻轴承负荷均有影响。研究成果对安装抱轴发电机的推进轴系精准校中计算具有较好的指导意义和参考价值。

关键词: 推进轴系, 动态校中, 不平衡磁拉力, 抱轴发电机, 有限元法