不同润滑油黏度对碰摩转子-轴承系统动力学行为的影响

在考虑非线性油膜力的基础上,建立了具有碰摩故障的转子 轴承系统的动力学模型·用Runge Kutta法详细分析了该转子 轴承系统的碰摩故障特性,发现了由倍周期分岔进入混沌运动、阵发混沌等多种进入混沌运动的道路.并深入研究了改变轴承润滑油黏度对具有碰摩故障的转子 轴承系统的动力学行为的影响,发现随着轴承润滑油黏度的降低,转子响应在二倍临界角速度以上的混沌区域扩大了,但是润滑油黏度的降低对转子系统在亚临界区域的运动状态影响不大·该结果为碰摩转子 轴承系统的安全运行和故障诊断提供了依据和参考·

Viscosity Effect of Different Lubricants on Dynamic Behavior of Rubbed/Impacted Rotor-Bearing System

Considering the nonlinear oil-film force and oil lubricant viscosity, a dynamic model was set up for a rotor-bearing system with rub-impact faults. Its characteristics of rub-impact faults was analyzed by Runge-Kutta numeral simulation. Some ways to chaos was found, such as the motion of double periodic bifurcation and intermittent motion. Furthermore, the influence of changing the viscosity of oil in bearings on the dynamic behavior of a rotor-bearing system with rub-impact fault was investigated. The results show that when the angular speed of rotating rotor exceeds the double critical angular speed the rotor's responsivity is improved in the chaotic region with the decrease of oil viscosity. However, the reduction of oil viscosity affect its dynamic behavior much less if the rotor motion is in the region of sub-critical angular speed. The results provide a reference basis for the safe operation and the failure diagnosis of a rotor-bearing system with rub-impact faults.