具有轴承不对中的多跨柔性转子系统非线性动力学研究

主要研究了具有不对中轴承支承的柔性多转子耦合系统的动力学建模和非线性动力学行为.首先在短轴承假设、小轴承的不对中量和圆盘不平衡量等几个基本假设条件下,考虑了转子的柔度、不对中轴承的非线性油膜力和圆盘的不平衡等因素后,建立了一个具有轴承不对中的10自由度多跨转子系统非线性动力学模型；最后采用数值方法研究了系统的非线性动力...

Nonlinear dynamics of flexible multi-rotor system supported on misaligned journal bearing

The dynamic modeling of a flexible rotor system supported on misaligned journal bearing was dis- cussed and its nonlinear dynamics was studied. Under some assumptions such as short journal bearing, small bearing misalignment and tiny unbalance, first, a dynamic model with ten degrees of freedom was established after considering the flexibility of shaft and misalignment of bearing and unbalance of disk. And then the non-linear dynamic characteristics of the rotor-bearing system were analyzed by numerical method. The result shows that at low speed the steady-state responses of the rotor are synchronous with the rotating speed, and as the speed increases there exists the vibration components of integer multiple frequencies in displacement responses, at higher speed the displacement response becomes synchronous with the speed again.