非线性转子-轴承耦合系统润滑及稳定性分析

为了分析滑动轴承与转子耦合系统的非线性动力学特性,采用全新的变流域流场计算的结构化动网格技术对滑动轴承的瞬态流场进行非稳态计算,提出基于计算流体力学（CFD）的润滑流场与转子动力学之间的弱耦合计算方法,形成转子与滑动轴承的流固耦合计算.讨论不同进油方式与进油压力对滑动轴承润滑流场的影响.数值计算表明,轴颈的涡动中心不仅决定于轴颈的转速和静载荷,而且随涡动幅值或动载荷的增大而升高；随着轴承长径比增大或间隙比减小,轴颈涡动中心上浮,易使转子-轴承系统失稳.

Lubrication and stability analysis of nonlinear rotor-bearing system

The transient oil flow field of journal bearing was calculated by using a new mesh movement approach for variable flow calculation based on structured grid in order to reveal the nonlinear dynamic behaviors of rotor-bearing coupling system. A quasi-coupling calculation method of transient fluid dynamics of oil film in journal bearing and rotor dynamics based on computational fluid dynamics (CFD) was proposed to realize the fluid-structure coupling calculation of rotor and journal bearing. The influences of oil inlet pattern and pressure on flow field of journal bearing were analyzed. The calculation results indicate that the whirling center of the journal relates not only to the rotation speed and static load but also to the vibration amplitude or dynamic load. When increasing the aspect ration or decreasing the clearance ration of journal bearing, the whirling center of the journal is floated upward, which in lead to the instability of rotor-bearing system.