隔振对机械转子-轴承系统振动特性影响

摘要

基于非线性油膜力模型和有限元方法，仿真分析了旋转设备轴系-弹性隔振系统的振动特性。结果表明，弹性隔振能够有效控制振动向基座的传递，但同时会导致设备轴振比刚性安装时明显增大。为避免在弹性隔振工作状态下轴振超标，在转子-轴承系统设计阶段考虑弹性隔振的影响是极有必要的。%Vibration characteristic of a shafting-resilient isolation system is studied numerically based on the nonlinear oil-film force model and finite element method. The results show that although employing the resilient mounting can reduce the vibration transmission to the foundation, it can cause a notable increase of shaft vibration. Thus, the influence of resilient mounting should be considered in design of shafting to avoid overlarge shafting vibration. Finally, some suggestions for rotor-bearing system design are presented.