Study on Oil Film Characteristic of Sliding Bearing based on SDT Roundness Error Model

Zhenyu Chen; Wubin Xu; Bing Li

doi:10.16578/j.issn.1004.2539.2022.04.006

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Study on Oil Film Characteristic of Sliding Bearing based on SDT Roundness Error Model

Theory·Reserach | 更新时间：2022-09-25

- Study on Oil Film Characteristic of Sliding Bearing based on SDT Roundness Error Model
- Journal of Mechanical Transmission Vol. 46, Issue 4, Pages: 42-47(2022)
- 作者机构：
  
  1.广西科技大学机械与汽车工程学院，广西柳州 545006
  2.广西土方机械协同创新中心，广西柳州 545006
- 作者简介：
- 基金信息：
- DOI：10.16578/j.issn.1004.2539.2022.04.006
  CLC：
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陈振宇,徐武彬,李冰.基于SDT圆度误差模型下滑动轴承油膜特性的研究[J].机械传动,2022,46(04):42-47.

Chen Zhenyu,Xu Wubin,Li Bing.Study on Oil Film Characteristic of Sliding Bearing based on SDT Roundness Error Model[J].Journal of Mechanical Transmission,2022,46(04):42-47.
陈振宇,徐武彬,李冰.基于SDT圆度误差模型下滑动轴承油膜特性的研究[J].机械传动,2022,46(04):42-47. DOI： 10.16578/j.issn.1004.2539.2022.04.006.

Chen Zhenyu,Xu Wubin,Li Bing.Study on Oil Film Characteristic of Sliding Bearing based on SDT Roundness Error Model[J].Journal of Mechanical Transmission,2022,46(04):42-47. DOI： 10.16578/j.issn.1004.2539.2022.04.006.

摘要

建立了轴颈存在圆度误差的滑动轴承转子系统动力学模型，基于小位移旋量（Small displacement theory，SDT）理论导出了新的广义圆度误差方程，并在Swift-Stieber边界条件下对雷诺方程进行数值求解，着重分析了基于SDT表征的圆度误差旋量参数,d,x,对滑动轴承油膜压力、承载能力、临界转速以及稳定性的影响。研究结果表明，圆度误差旋量参数会改变最大油膜压力，而且油膜压力会随着旋量参数的增大而增大；此外，轴颈圆度误差的存在会在一定程度上有利于滑动轴承转子系统的承载能力及稳定性，且随着圆度误差旋量参数的增大，其促进作用更加明显；其中，当偏心率,ε,<,0.8时，轴颈圆度误差对系统承载能力的影响更加明显，当Sommerfeld数,S,>,0.6时，轴颈圆度误差对稳定性的影响较小；同时，系统的临界转速也会随着旋量参数的增大而增大，特别是在偏心率,ε,>,0.6时，增大现象更加明显。

Abstract

A dynamic model of journal bearing rotor system with roundness error is established，and a new generalized roundness error equation is derived based on the small displacement theory （SDT）. The Reynolds equation is solved numerically under the Swift-Stieber boundary conditions，and the influence of the spin parameter of roundness error ,d,x,，which is characterized by SDT，on the oil film pressure，bearing capacity，critical speed and stability of sliding bearing is analyzed emphatically. The results show that the maximum oil film pressure is changed by the spin parameter of roundness error， and the oil film pressure increases with the increase of the spin parameter； in addition， the existence of journal roundness error is beneficial to the bearing capacity and stability of sliding bearing rotor system to a certain extent； among them，when eccentricity ,ε,<,0.8， the influence of journal roundness error on the bearing capacity of the system is more obvious，and when Sommerfeld number ,S,>,0.6， the influence of journal roundness error on the stability is less； at the same time，the critical speed of the system will increase with the increase of screw parameter，especially when eccentricity ,ε,>,0.6.

关键词

小位移旋量理论（SDT）滑动轴承圆度误差油膜特性

Keywords

Small displacement theory（SDT）Sliding bearingRoundness errorOil film characteristic

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