Investigation on the stability of periodic motions of a flexible rotor-bearing system with two unbalanced disks

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• 作者：Chaofeng Li (1)
  Shihua Zhou (1)
  Shijie Jiang (2)
  Hexing Yu (1)
  Bangchun Wen (1)
  
• 关键词：Rotor ; bearing system ; Eccentricity phase ; Stability ; Oil whip
• 刊名：Journal of Mechanical Science and Technology
• 出版年：2014
• 出版时间：July 2014
• 年：2014
• 卷：28
• 期：7
• 页码：2561-2579
• 全文大小：11,550 KB
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• 作者单位：Chaofeng Li (1)
  Shihua Zhou (1)
  Shijie Jiang (2)
  Hexing Yu (1)
  Bangchun Wen (1)
  
  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang, 110819, China
  2. Mechanical & Mining Engineering, University of Queensland, Brisbane, St Lucia, QLD, 4072, Australia
  
• ISSN：1976-3824

文摘

The stability of periodic motion of a rotor-bearing system with two unbalanced disks is analyzed based on a multi-degree of freedom (M-DOF) finite element model. Nonlinear effects of supporting oil-film and inertia distributions as well as shearing effect are taken into account. Focusing on the more realistic FE method to study the stability of nonlinear rotor-bearing system with the influence of the eccentricity phase, the stability calculation of the M-DOF FE model is done by using the combination of Shooting method and Newmark method. Experiments with a rotor-bearing test rig (two disks on a shaft with two bearings) are then performed and results are presented. It is found that typical instability characteristic is successfully produced. Through comparisons between calculated results and measurements, it is shown that the combination of Shooting method and Newmark method in studying the M-DOF rotor-bearing system is useful, especially for the complex rotor-bearing system. In addition, altering eccentricity phase of the two disks can significantly influence instability type and speed. When the two disks are out of phase, the occurring of oil whip is restrained effectively. It is suggested that a careful examination should be made in modeling more complex non-linear rotor-bearing system. Some response curves are shown to compare the beam motions at different load velocities.