The rotor-bearing-housing system is widely used in rotating machines, which influences the performance of the whole machine. Considering the distribution of rotor mass, the rotor-bearing-housing system with local defect in the outer ring is modeled based on the energy method. In order to make the model agree well with the experimental results, a new rotor mass distribution method was introduced in the modeling process. The simulated vibration signal was obtained by solving the dynamic equations with the Runge-Kutta method. The vibration responses of rotor-bearing-housing system under different distributed disks at both drive end and fan end are simulated. In the simulation results, the outer ring fault signal at the drive end and the vibration signal at the fan end are compared with the experimental signals to discuss the influence of rotor mass distribution on the vibration response of the bearing at both ends of the system. The results show that the simulation signal generated by the dynamic model of the rotor-bearing-housing system with a more uniform rotor mass distribution is more consistent with the experimental signal. The vibration response of the faulty bearing at drive end is compared at different defect sizes, and the variation trend of the amplitude of their characteristic frequency is obtained. This method is helpful for structural optimization and fault diagnosis of the rotor-bearing-housing system.

转子轴承壳体系统广泛用于旋转机械中，这会影响整个机械的性能。考虑到转子质量的分布，基于能量法对外圈局部有缺陷的转子轴承壳体系统进行了建模。为了使模型与实验结果吻合，在建模过程中引入了一种新的转子质量分布方法。通过使用Runge-Kutta方法求解动力学方程，获得了模拟的振动信号。模拟了在驱动端和风扇端不同分布盘的情况下转子轴承壳体系统的振动响应。在模拟结果中 将驱动端的外圈故障信号和风扇端的振动信号与实验信号进行比较，讨论转子质量分布对系统两端轴承振动响应的影响。结果表明，由转子轴承壳体系统动力学模型产生的仿真信号具有更均匀的转子质量分布，与实验信号更加吻合。比较了在不同缺陷尺寸下驱动端故障轴承的振动响应，并获得了其特征频率振幅的变化趋势。该方法有助于转子轴承壳体系统的结构优化和故障诊断。结果表明，由转子轴承壳体系统动力学模型产生的仿真信号具有更均匀的转子质量分布，与实验信号更加吻合。比较了在不同缺陷尺寸下驱动端故障轴承的振动响应，并获得了其特征频率振幅的变化趋势。该方法有助于转子轴承壳体系统的结构优化和故障诊断。结果表明，由转子-轴承-壳体系统动力学模型产生的转子质量分布更均匀的仿真信号与实验信号更加吻合。比较了在不同缺陷尺寸下驱动端故障轴承的振动响应，并获得了其特征频率振幅的变化趋势。该方法有助于转子轴承壳体系统的结构优化和故障诊断。