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<p>The lubrication performance of bearings under frequent start-stop conditions is crucial for the stability and service life of the bearing system. To investigate the interaction mechanism between transient mixed lubrication characteristics and dynamic response during start-up, a tribo-dynamic coupling model is established, considering misalignment, wear, and rotor imbalance. Furthermore, surface contact and surface elastic deformation are introduced into the dynamic system. Numerical solutions are solved using finite difference method and Newmark-<i>β</i> method. The effects of operating and bearing parameters on the tribological properties of the bearing system are discussed. Findings indicate that misalignment alters the pressure distribution and increases bearing force before rotor lift-off, while the unbalance force affects the lubrication characteristics in the hydrodynamic lubrication stage. Additionally, rotor imbalance, misalignment, surface roughness and acceleration time significantly alter the wear properties.</p>

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Transient mixed lubrication analysis of the hydrodynamic bearing-rotor system during start-up considering misalignment and wear

  • 期刊论文

  • 发表日期：

    2025年4月6日

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  • Gang Wang,
  • Xuewei Zhao,
  • Yi Zhang,
  • Changlin Li,
  • Jianjun Du

摘要

The lubrication performance of bearings under frequent start-stop conditions is crucial for the stability and service life of the bearing system. To investigate the interaction mechanism between transient mixed lubrication characteristics and dynamic response during start-up, a tribo-dynamic coupling model is established, considering misalignment, wear, and rotor imbalance. Furthermore, surface contact and surface elastic deformation are introduced into the dynamic system. Numerical solutions are solved using finite difference method and Newmark-β method. The effects of operating and bearing parameters on the tribological properties of the bearing system are discussed. Findings indicate that misalignment alters the pressure distribution and increases bearing force before rotor lift-off, while the unbalance force affects the lubrication characteristics in the hydrodynamic lubrication stage. Additionally, rotor imbalance, misalignment, surface roughness and acceleration time significantly alter the wear properties.