摘要
采用新的短轴承非稳态油膜力公式和非稳态油膜轴承 -转子系统碰摩的刚性约束非光滑模型 ,通过数值模拟 ,得到了该系统随转动角频率及油膜特性参数变化发生碰摩的分岔和混沌特性 ,并与稳态油膜力模型进行比较。数值模拟结果表明 :该系统会在临界转速附近的主共振区和超临界转速的油膜振荡区内分别存在碰摩现象 ,但当超临界转速足够高时碰摩会消失。此外 ,在高转速时增大油膜粘性可能防止碰摩产生。本文指出新的非稳态非线性油膜力模型呈现一些与以往稳态模型不同的特性 ,并具有工程实际意义。
A rubbing bearing rotor system with rigid constraints are analysed by using a new analytic formula of unsteady oil film forces. The bifurcation and chaotic behavior of the rubbing rotor system varying with the rotation angular frequency and the oil film characteristic parameter are obtained through numerical simulations. It is found that there may be two rubbing regions which are located either near the critical rotation speed or inside the supercritical speed region, and rubbing disappears at sufficiently high supercritical rotation speeds. Moreover, increasing the viscoasity of the oil film can prevent the rotor from rubbing for high rotation speeds. The numerical simulation results are compared with that given by the model of steady oil film force in order to show the availability of the new unsteady one.
出处
《振动工程学报》
EI
CSCD
北大核心
2002年第1期68-73,共6页
Journal of Vibration Engineering
基金
国家自然科学基金 (编号 :19990 5 10 10 172 0 11)
航空基础科学基金 (编号 :98B5 112 5 )资助项目
