作为船舶推进装置的关键部件，船用转子-轴承系统在恶劣海况下的动力学行为直接关系到推进装置的稳定性和可靠性。以船舶垂荡运动下的转子-轴承系统为研究对象，在非惯性参考系下，基于长轴承理论和Lagrange方程建立了具有平行不对中故障的转子-轴承系统动力学模型。采用数值方法对系统在多种参数下的稳态响应进行了深入计算和分析，并通过转子实验台验证了模拟结果的准确性。结果表明：随着转子转速的提高，转子系统的轴心轨迹呈现出准周期运动与混沌运动交替的特征。垂荡运动加剧了系统的谐波分岔现象，并对转子的稳定性造成了一定程度的削弱。特别是在低转速区间，垂荡运动对转子系统的影响尤为显著，而在高转速区间则相对减弱。此外，平行不对中故障的存在会显著改变系统的轴心轨迹和垂荡运动在转子系统特定方向产生的频率成分。

As a key component of the ship propulsion device, the dynamic behavior of the marine rotor-bearing system under severe sea conditions is directly related to the stability and reliability of the propulsion device. The rotor-bearing system under ship heave motion was taken as the research object. Based on the long bearing theory and Lagrange equation, the dynamic model of the rotor-bearing system with parallel misalignment fault was established in the non-inertial reference system. The steady-state response of the system under various parameters was calculated and analyzed by numerical method, and the accuracy of the simulation results was verified by the rotor test bench. The results show that with the increase of the rotor speed, the axis orbit of the rotor system presents the characteristics of quasi-periodic motion and chaotic motion alternately. Heave motion aggravates the harmonic bifurcation phenomenon of the system and weakens the stability of the rotor to a certain extent. Especially in the low speed range, the influence of heave motion on the rotor system is particularly significant, while it is relatively weakened in the high speed range. In addition, the existence of parallel misalignment faults will significantly change the frequency components generated by the axis trajectory and heaving motion of the system in a specific direction of the rotor system.