滑动轴承中非线性油膜力引起转子的涡动研究

A Study on Rotor Whirl Due to Nonlinear Oil-Film Forces in Journal Bearing System

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、转子中心振幅及涡动频率提出了相对的简单计算方法.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.因此,虽然润滑油的粘性本身就对振动有阻尼作用,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.在所建立的方程中使压粘系数等于零时,其结果与经典方法计算所得的结果符合度甚好.

This paper presents an analysis of the rotor whirl due to nonlinear oilfilm forces considering pressureviscosity effect in short journal bearing, after the loss of stability of rotorshort bearing system.The investigation shows a relatively easy calculation method to determine the whirl frequency and predicts variation law in whirl amplitude with rotational speed .