油液激励转子不稳定性的计算机仿真

Modeling of a Fluid-Induced Rotor Instability

基于Muszynska的理论,介绍了一种新的轴颈轴承转子振动的计算机仿真方法。转动过程中,轴颈轴承的转子依靠滑油油膜形成的油楔保持平衡,轴承受力可描述为旋转的弹簧阻尼系统。以轴心线为原点的复坐标系描述转子的运动,位置矢量的实部表示转子X方向的位移,虚部表示垂直方向的位移,即Y轴方向,运动方程为时间的复变量函数,方程参数亦为复数。描述了如何利用Simulink进行转子系统的计算机仿真,不同步干扰力的作用下转子运动的不稳定性及其振动模式。利用Simulink进行的转子系统的仿真进一步证实了Muszynska模型,仿真结果与具体的实验结果一致。

The paper deals with simulation of the rotor vibration in a journal bearing. The rotor is maintained in equilibrium during rotation by a fluid pressure wedge created by an oil film. These bearing forces can be modeled as a rotating spring and damper system. The rotor motion is described by complex coordinates of the rotor centerline. The real part of the position vector is a rotor displacement in the X - direction while the imaginary part is a displacement in the perpendicular direction, as we say in the Y - direction. The equation of motion is containing complex variables as a function of time. Equation parameters are complex quantities as well. The paper demonstrates how to solve such an equation using Simuling.