Non-linear dynamics of flexible multi-rotor system with a misaligned journal bearing and non-circular cross section of shaft

作者：Li Zi Gang^*; Li Ming

来源：Journal of Vibration Engineering, 2012, 25(1): 68-73.

• Bearing misalignments
• Co-ordinate transformation
• Flexible rotors
• Largest Lyapunov exponent
• Non-circular cross-section
• Non-circular shafts
• Nonlinear dynamic behaviors
• Nonlinear oil film forces

The non-linear dynamic behavior of rotor system with a misaligned journal bearing and non-circular cross section of shaft is analyzed in the present paper. Based on coordinate transformation, the non-linear dynamic model of the rotor system is derived under some assumptions such as the long journal bearings, small misalignment and tiny disk unbalance. Using numerical technique the nonlinear dynamic behaviors, such as steady state response, rotor center orbit, Poincare´section and the largest Lyapunov exponent, are paid more attention. The results show that at low speed besides synchronous components with rotating speed according to unblance there exist multiple and combined frequency components according to misalignment. As the speed increases the bifurcation phenomena, such as periodic motions, chaotic oscillations occur.

• 出版日期2012