中文摘要：

船体变形是影响船舶推进轴系振动的一个重要因素，但目前对于轴系横向振动的研究都是在基于船体为刚性体，不发生变形的前提下进行。针对某散货船，采用有限元法建立了船体变形下，轴系中心线垂向相对变形对轴系横向振动影响的计算方法和流程。结果表明：船体在不同工况下，轴系中心线垂向相对变形对轴系横向振动固有频率有着显著的影响。

英文摘要：

The hull deformation is one of the most important factors influencing on propulsion shafting vibration. However the current research on shafting lateral vibration is based on the hull as rigid body without deformation. Taking bulk carrier as a calculation example, the paper presents the calculation procedure and methods for shafting lateral vibration by FEM, which takes shafting center line vertical relative deformation into consideration. The result shows that under different conditions, shafting center line vertical relative deformation makes significant influence on shafting lateral vibration natural frequency.