• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2022, Vol. 58 ›› Issue (5): 87-97.doi: 10.3901/JME.2022.05.87

• 机械动力学 • 上一篇    下一篇

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双转子系统中介轴承的动载荷及其对轴承温度的影响

高朋1,2, 侯磊1, 陈予恕1   

  1. 1. 哈尔滨工业大学航天学院 哈尔滨 150001;
    2. 南京理工大学智能制造学院 南京 210094
  • 收稿日期:2020-07-07 修回日期:2021-12-05 出版日期:2022-03-05 发布日期:2022-04-28
  • 通讯作者: 侯磊(通信作者),男,1987年出生,博士,教授。主要研究方向为航空发动机转子系统非线性动力学。E-mail:houlei@hit.edu.cn E-mail:houlei@hit.edu.cn
  • 作者简介:高朋,男,1991年出生,博士研究生。主要研究方向为航空发动机转子系统非线性动力学。E-mail:gaopeng_hit@126.com
  • 基金资助:
    国家科技重大专项(2017-IV-0008-0045);国家自然科学基金(11972129&11602070);辽宁省科技厅博士启动基金(2019BS182)资助项目。

Dynamic Load of the Inter-Shaft Bearing and Its Influence on Bearing’s Temperature

GAO Peng1,2, HOU Lei1, CHEN Yu-shu1   

  1. 1. School of Astronautics, Harbin Institute of Technology, Harbin 150001;
    2. School of Intelligent Manufacturing, Nanjing University of Science and Technology, Nanjing 210094
  • Received:2020-07-07 Revised:2021-12-05 Online:2022-03-05 Published:2022-04-28

摘要: 通过结合传热学和非线性动力学,探讨了航空发动机双转子系统中介轴承在动载荷作用下的热行为。通过双转子系统动力学响应计算获得中介轴承动载荷,将其代入Palmgren经验公式,得到中介轴承的载荷摩擦热和黏度摩擦热,从而建立中介轴承在动载荷作用下的瞬态热传递模型。通过数值计算得到中介轴承各部位的瞬态温度,发现滚子温度最高,外圈温度最低,且温升速率逐渐衰减为零。进一步分析转速、润滑剂运动黏度和环境温度对中介轴承温度和摩擦热的影响,结果表明,中介轴承温度和总摩擦热在双转子系统共振区内骤增并形成两个峰值,在系统非共振区内则逐渐增大;在共振区内,载荷摩擦热起决定作用,在非共振区内,黏度摩擦热起决定作用;润滑剂运动黏度会显著影响黏度摩擦热,从而影响总摩擦热以及中介轴承温度,而环境温度只影响中介轴承温度。中介轴承动载荷能够在一定程度上体现双转子系统的动力学特性,因此,双转子系统的动力学特性对轴承的热行为有着至关重要的影响,在轴承设计中应予以考虑。

关键词: 双转子系统, 中介轴承, 动载荷, 摩擦热, 热传递

Abstract: Thermal behaviors of the inter-shaft bearing under the dynamic load in aero-engine dual-rotor system are investigated by combining heat transfer and nonlinear dynamics. The dynamic load of the inter-shaft bearing is obtained based on dynamic responses of the dual-rotor system. Then substitute into Palmgren’s empirical formula to estimate the load friction heat and the viscosity friction heat of the inter-shaft bearing, based on which, an transient heat transfer model under the dynamic load of the inter-shaft bearing is presented. The temperature evolutions of the inter-shaft bearing are obtained by numerical calculation. It is found that the temperature of rollers is the highest while the temperature of outer ring is the lowest, and the rise rate of temperatures are the highest at first, then gradually decreases to zero. Furthermore, the effects of rotation speed, lubricant viscosity and ambient temperature on temperatures and friction heat of the inter-shaft bearing are analyzed afterwards. The results show that temperatures and the total friction heat of the inter-shaft bearing increase sharply and form two peaks in resonance zones of the dual-rotor system, while increase gradually in non-resonance zones of the system. In resonance zones, the load friction heat plays a decisive role; in non-resonance zones, the viscosity friction heat plays a decisive role. The lubricant viscosity has a significantly influence on the viscosity friction heat, thus it also affects the total friction heat and temperatures of the inter-shaft bearing. The ambient temperature only affects temperatures of the inter-shaft bearing. The dynamic load of the inter-shaft bearing can reflect the dynamic characteristics of the dual-rotor system to a certain extent. Therefore, the dynamic characteristics of the dual-rotor system have a significant influence on thermal behaviors of the bearing, which should be considered in the bearing design.

Key words: dual-rotor system, inter-shaft bearing, dynamic load, friction heat, heat transfer

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