摘要
研究了短轴承考虑压粘效应油膜力引起的转子涡动 ,为转子失稳后轴颈中心振幅、转子振幅及涡动频率提出了计算方法。算例表明 :当轴承相对间隙值保持定值时 ,轴颈中心的振幅 ,转子中心的振幅 ,涡动频率均较没有考虑压粘效应时相应值低。这说明虽然润滑油的粘性对振动有阻尼作用 ,但是 ,考虑压粘效应会使阻尼作用增大 ,从而使振幅衰减 ,特别是使转子中心的振幅有较大的衰减。这些在轴承 转子体系设计时是应该考虑的。在所建立的方程中使压粘系数等于零时 ,退化成不考虑压粘效应的情况 。
This paper presents an analysis of the rotor whirl due to nonlinear oil-film forces considering pressure viscosity effect in short bearing. We give a simple iterative calculation-method to determine the whirl frequency and to predict the variation law in whirl amplitude with rotational speed of journal after loss of stability of rotor-short bearing system. Numerical example is is given, the results show that due to pressure viscosity effect, the amplitude of journal center, the amplitude of rotor center, and whirl frequency are smaller than those in classical theory. This shows that though the viscosity of lubricating oil has damping for vibrating, but pressure viscosity effect can make damping increase, so it makes amplitude attenuate, especially makes the amplitude of rotor center attenuate considerably if pressure viscosity effect is considered. The attenuation of rotor amplitude can reach 20%, it should be considered in rotor-bearing system design.
出处
《机械科学与技术》
CSCD
北大核心
2004年第5期546-548,共3页
Mechanical Science and Technology for Aerospace Engineering
基金
武汉科技大学机械传动与制造工程湖北省重点实验室基金项目资助
关键词
转子短轴承体系
压粘效应
非线性油膜力
涡动
Rotor-short bearing system
Pressure-viscosity effect
Nonlinear oil-film forces
Whirls
