Abstract: A classical frequency-domain lumped parameter multi-particle model is adopted to obtain the time domain transient torsional vibration response of electric propulsion shafting subjected to ice impacts. Based on this model，the key technologies and influencing factors such as calculation method，speed drop of shafting，excitation and damping of the system were researched，and the flow of transient torsional vibration calculation in the time domain of electric propulsion shafting under ice impacts was put forward. Moreover，taking the electric propulsion shafting of a certain polar carrier as the research object，the transient torsional vibration of the shaft line in this ship was calculated. And the speed drop and dynamic response of the shafting under ice impacts was obtained. The simulation results show that the relative difference of maximum shear stress amplitude at 2# intermediate shaft between this result and the foreign research is 1.0%. The calculation method and the correctness of the program were verified by the simulation，thus providing engineering reference for the time domain transient torsional vibration calculation of electric propulsion shafting in ice area.

Key words: Propulsion shafting；Transient torsional vibration；Ice load；Electric propulsion

摘要： 为获得船舶电力推进轴系在冰载荷冲击作用下的时域瞬态扭转振动响应，采用经典的频域集总参数多质点模型，基于该模型对电力推进轴系时域瞬态扭振计算中的计算方法、轴系转速降、激励、阻尼等关键技术及影响因素进行研究，提出冰载荷冲击作用下电力推进轴系时域瞬态扭振计算的流程。以极地运输船电力推进轴系为研究对象，对该船推进轴系进行时域瞬态扭振计算，获得推进轴系在冰载荷冲击作用下的轴系转速降及动态响应。实例仿真结果表明，2#中间轴最大应力幅值与国外计算报告的相对误差为1.0%，验证了计算方法及程序的正确性。

关键词: 推进轴系；瞬态扭振；冰载荷；电力推进