高速滚动轴承多因素耦合动态润滑膜热失稳研究

项目名称： 高速滚动轴承多因素耦合动态润滑膜热失稳研究

项目编号： No.51475250

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 刘晓玲

作者单位： 青岛理工大学

项目金额： 85万元

中文摘要： 随着航空发动机等高速机械的发展，滚动轴承因发热产生的问题愈来愈严重。在高速高温条件下不仅弹流润滑膜失效和表面损伤多发，且其润滑行为偏离经典弹流润滑理论。目前对轴承温度场的研究尚未与弹流润滑膜的热失稳相联系，油膜热失稳的研究尚未系统展开，而轴承热弹流润滑的研究多假定轴承组件与润滑膜的边界温度相同，而未考虑多因素耦合条件下高速滚动轴承动态油膜的热失稳问题。 本研究拟通过实验手段和数值模拟，1) 研制滚动轴承温度测量系统；2) 建立滚动轴承热分析模型；3) 建立多因素耦合的动态润滑膜热失稳模型；4) 综合考虑润滑剂流变特性、表面微观特性、润滑剂供给和动态特性等因素对油膜热失稳的影响；5) 给出表面润滑膜破裂和组件温度的关系，确定油膜破坏的临界温度，为油膜的热失稳提供判据。本项目首次将滚动轴承温度场与动态油膜的热失稳研究相结合，可为高速滚动轴承的失效分析提供基础数据，提高其润滑性能。

中文关键词： 热失稳；润滑膜；温度场；多因素耦合

英文摘要： With the development of high-speed machinery such as aircraft engine, etc., problems due to thermal generation in bearings become more and more severe. Under the condition of high speed and high temperature, not only failure of elastohydrodynamic lubrication (EHL) and surface damage occur frequently, but also the lubricating property deviates from the classical EHL theory. At present, study on the temperature field of rolling bearings has yet not combined with the thermal instability of EHL film, and an investigation on the thermal instability of oil film has not been carried out systematically; whereas most research on EHL of bearings assumed that the boundary temperature of the bearing assembly was the same as that of the lubricating film, and problems of the thermal instability of dynamic film coupled with multi-factors in high-speed rolling bearings have not been considered. This proposal is proposed by means of experiment and numerical simulation, including: 1) To develop a measuring system for the temperature field of bearings; 2) To set up a model of thermal analysis for bearings; 3) To build a thermal instability model of dynamic film incorporating multi-factors; 4) To overall consider effects of the rheological property of the lubricant, surface micro-characteristic, the supply of the lubricant, and dynamic behaviour, etc. on the thermal instability of the film; 5) To present a relationship between the film rupture and the temperature, to determine the critical temperature for film rupture, and to provide criteria for thermal instability of the film. Upon success of this project, realistic temperature field of bearings will combined with thermal instability of film for the first time, useful data will be provided for failure analysis in high-speed rolling bearings, and improve their lubricating performance.

英文关键词： thermal instability;lubricating film;tempearture field;multi-factors coupled