高速轻载工况下滚动轴承打滑失效机理及其抑制方法研究

项目名称： 高速轻载工况下滚动轴承打滑失效机理及其抑制方法研究

项目编号： No.51505361

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 机械、仪表工业

项目作者： 李军宁

作者单位： 西安工业大学

项目金额： 20万元

中文摘要： 高速轻载工况下滚动轴承的打滑失效现象，在航空发动机主轴承等重要应用中时有发生，从而将严重影响整机服役性能。本项目主要围绕高速轻载滚动轴承打滑及其导致的损伤失效机理、以及两者之间的耦合关系展开研究。在计及边缘效应与偏载影响的精细化载荷分布、膜厚计算方法研究基础上，基于拟动力学方法进行高速轻载滚动轴承打滑分析；而针对较小载荷情况，构建引入粘滞阻尼作用影响的动力学模型，分析高速轻载滚动轴承打滑机理。为进一步阐明打滑与失效之间的内在联系与影响机制，研制适用于高速轻载工况的试验系统。结合微接触区温度、膜厚、载荷、转速等多参数实时监测及微观结构与成分分析等方法，试验研究揭示不同滑差率、工况参数、表面形貌参数、偏载等滑差因素耦合作用下滚动轴承打滑失效机理，探索高速滚动轴承打滑失效抑制方法。该研究不仅有助于丰富极端工况下轴承设计理论，而且有望为航空发动机、风机等领域的工程实践提供借鉴意义。

中文关键词： 高速轻载；滚动轴承；打滑；失效；试验研究

英文摘要： Skidding damage of rolling bearings often occurs in rotating machinery under high-speed and light-load conditions, such as the main shaft bearings of aircraft gas turbines, which could eventually affect the service performance of the machine. The skid of high-speed and light-load rolling bearings (HSLLRBs) and its effects on skidding damage are studied in this project. The oil film thickness and load distribution considering the unbalanced loading and edge effect are studied, and then the skidding mechanisms of HSLLRBs are analyzed based on the quasi-dynamic method. Besides, in the condition of the smaller load, the hysteresis and oil-film damping effects are considering, and then the skidding mechanisms of HSLLRBs are analyzed based on the dynamic method. In order to further illustrate the relationship between slip and skidding damage, the skidding damage test rig for the high-speed and light-load conditions is developed. Combined with the real-time monitoring technology of contact temperature, oil film thickness, load, speed and other parameters, and the microstructure and composition analysis methods, the mechanism of skidding damage to a rolling bearing is revealed by changing experimental conditions such as the slip, operating parameters, surface topography, unbalanced loading, so as to obtain the inhibition method for skidding damage of HSLLRBs. The proposed project is expected to enrich the art of the current state of bearing design theory for extreme applications, and also to supply constructive suggestions for the engineering practice in aircraft engine, wind turbine, etc.

英文关键词： high-speed and light-load;rolling bearing;skidding;damage;experimental study