• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (23): 108-115.doi: 10.3901/JME.2017.23.108

• 机械动力学 • 上一篇    下一篇


裴世源1, 徐华1,2, 石放辉3   

  1. 1. 西安交通大学现代设计与转子轴承系统教育部重点试验室 西安 710049;
    2. 新疆大学机械工程学院 乌鲁木齐 830046;
    3. General Motors Company, Warren, Michgan, 48090, US
  • 收稿日期:2016-09-14 修回日期:2017-06-05 出版日期:2017-12-05 发布日期:2017-12-05
  • 作者简介:裴世源,男,1983年出生,讲师。主要研究方向为工程摩擦学、润滑理论和多尺度计算。E-mail:peishiyuan@mail.xjtu.edu.cn。
  • 基金资助:

Study on Static Thermo-hydrodynamic Lubrication of Floating Ring Bearing

PEI Shiyuan1, XU Hua1,2, SHI Fanghui3   

  1. 1. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xi'an, 710049;
    2. School of Mechanical Engineering, Xinjiang University, Urumqi, 830046;
    3. General Motors Company, Warren, Michgan, 48090, US
  • Received:2016-09-14 Revised:2017-06-05 Online:2017-12-05 Published:2017-12-05

摘要: 环速比是影响浮环轴承静动特性的关键运行参数,大量试验数据表明浮环轴承环速比与工作转速的呈强烈的非线性关系,而理论对环速比的预测还存在较大偏差,针对该问题,建立了浮环轴承的稳态热流体动力润滑润滑模型,计算了典型工况下轴承的动静特性参数,研究了等温、导热和绝热情况下环速比、温升、功耗和偏心率等关键参数随转速的变化规律,分析了浮环材料对环速比的影响,探讨了传统环速比解析计算公式的适用范围.研究发现:等温模型在大部分转速范围内均严重高估了环速比,而基于导热模型的计算结果与试验结果吻合良好,随着转速的升高,理论和试验结果均显示环速比先急速上升后逐渐下降,在中高转速下内外膜的黏度差异和热变形是环速比快速下降的两个重要因素,同时,使用高热膨胀系数材料的浮环会导致环速比进一步降低.因此,热效应是浮环轴承设计过程中必须要考虑的因素.

关键词: 浮环轴承, 环速比, 热流体动力润滑, 热效应

Abstract: The ring speed ratio largely determines the steady state and dynamic response of a floating ring bearing (FRB). Extensive experiments demonstrate FRB speed ratios have a strong nonlinear relationship with journal rotative speed, but theoretical predictions show significant discrepancies with test data. Aiming at solving this problem, a thermal-hydrodynamic model is established to investigate the lubrication performance of FRB. The state and dynamic performance of FRB under several typical operational conditions are calculated. The relationship between speed ratio and journal rotative speed is investigated under isothermal, conducive and adiabatic conditions. The influence of ring material on the speed ratio is also addressed. Furthermore, the fitness conditions of the classical analytical formula of speed ratio is discussed. The main conclusions are as follows:the isothermal model overestimate the speed ratio significantly under a wide range of rotative speed, whereas the results of conducive thermal model shows a good agreement with existing experiment data. Both the theoretical and experimental results show that the speed ratio increase sharply at low speed, then decrease gradually with further increasing journal rotative speed. The ring speed ratios decrease under moderate and high shaft speed is mainly due to the difference of the lubricant viscosity between inner and outer film and the variation in film clearances owing to thermal growth of the components. Hence, the thermal effect is mandatory for reliable FRB design.

Key words: floating ring bearing, ring speed ratio, thermal effect, thermo-hydrodynamic (THD)