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<p>To investigate the effect of surface roughness with different distributing orientations on dynamic characteristics of lubricant film including stiffness and damping coefficients, and stability parameters for hydrodynamic/static hybrid bearing-rotor system. Christensen’s stochastic theory was used to develop the average Reynolds equations and energy equations for hybrid bearing with longitudinal, transverse, and isotropic roughness, respectively, and the Boussinesq integral is utilized to obtain the elastic deformation of bearing housing based on elastic semi-finite space. The finite element method and finite difference method were used to solve the Reynolds equation and energy equation, respectively. The variation of stiffness, damping coefficients, and critical rotor mass with surface roughness were described. The calculated film pressure was compared with the published literature to validate the models. The analysis results indicated that the stiffness and direct damping coefficients climb with the increase in transverse surface roughness significantly, and the maximum increase percentage reaches 52.49%. Both longitudinal and transverse roughness can increase the equivalent stiffness and critical rotor mass when roughness <i>Ra</i> is less than 5.09&#xa0;m, note that it increases by 55.65% higher than the smooth surface at <i>Ra</i> = 7.34&#xa0;m of transverse roughness. Nevertheless, increasing the isotropic surface roughness will impair the damping performance of the oil film and the stability of rotor system. This stochastic lubrication model is coupled with elastic deformation equations to reveal the thermos-elastohydrodynamic lubrication mechanism of hybrid bearing with different types of surface roughness and provide the analysis data that is closer to actual operating conditions.</p>

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On the dynamic and stability behavior of hydrodynamic/static hybrid bearing with different types of surface roughness

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Shuai Yang,
  • Jinzhao Chen,
  • Shusen Zhao,
  • Xiaopeng Wang,
  • Shuanghui Xi

摘要

To investigate the effect of surface roughness with different distributing orientations on dynamic characteristics of lubricant film including stiffness and damping coefficients, and stability parameters for hydrodynamic/static hybrid bearing-rotor system. Christensen’s stochastic theory was used to develop the average Reynolds equations and energy equations for hybrid bearing with longitudinal, transverse, and isotropic roughness, respectively, and the Boussinesq integral is utilized to obtain the elastic deformation of bearing housing based on elastic semi-finite space. The finite element method and finite difference method were used to solve the Reynolds equation and energy equation, respectively. The variation of stiffness, damping coefficients, and critical rotor mass with surface roughness were described. The calculated film pressure was compared with the published literature to validate the models. The analysis results indicated that the stiffness and direct damping coefficients climb with the increase in transverse surface roughness significantly, and the maximum increase percentage reaches 52.49%. Both longitudinal and transverse roughness can increase the equivalent stiffness and critical rotor mass when roughness Ra is less than 5.09 m, note that it increases by 55.65% higher than the smooth surface at Ra = 7.34 m of transverse roughness. Nevertheless, increasing the isotropic surface roughness will impair the damping performance of the oil film and the stability of rotor system. This stochastic lubrication model is coupled with elastic deformation equations to reveal the thermos-elastohydrodynamic lubrication mechanism of hybrid bearing with different types of surface roughness and provide the analysis data that is closer to actual operating conditions.