柔性支承下高速球轴承蠕滑分析及其动态特性研究

High-speed bearings are key components of aero engine, precision machine tools and other major equipment. It is directly related to the operational reliability and service life of the machine equipment. In lightweight design background, bearing deformation itself will have a significant impact high-speed bearing performance. The project aims to the problem of uncertained tribological mechanism and imperfect theoretical analysis model in high-speed bearings having deformable races structure. Based on rolling contact and EHL theory, combined with ball bearings quasi-dynamics analysis, Creep analysis method on rolling contact between ball bearings rolling and roller is explored, and the ball bearings creep quasi-dynamics analysis model is established. Rolling contact slimy mechanism between ball bearings rolling and roller is revealed. Friction and wear mechanisms of high speed ball bearing having deformable races structure are definite. The quantitative relationship between the stress level and reliability is explored, and the accelerated life test model of high-speed ball bearing under the flexible support is established. Explore the quick calculation method of ball bearings rolling contact issues with mixed material. The influence of speed, friction coefficient, the external load factors and other conditions to contact angle, spin roll ratio, dynamic stiffness, resistance torque characteristics in high speed ball bearing with flexible support is revealed. This project provide a theoretical basis on optimized design, performance evaluation, failure mechanisms and fault diagnosis and other important engineering problems of low friction and wear structures in high speed ball bearing. Further more, theoretical guidance for the development of new bearing materials and lubrication medium is provided.

高速轴承是航空发动机、精密机床等重大装备的关键零部件，直接关系到整机装备的运行可靠性和工作寿命。在轻量化设计背景下，轴承本身变形会对高速轴承性能产生重大影响。本项目针对柔性支承下高速球轴承摩擦学机理不明朗和理论分析模型不完善的问题，基于滚动接触与弹流润滑理论，结合球轴承拟动力学分析思想，建立球轴承拟动力学蠕滑分析模型；揭示滚动体/滚道滚动接触粘滑机理，明确柔性支承下高速球轴承的摩擦磨损机理；探索柔性支承下高速球轴承应力水平与可靠性寿命之间的定量关系，建立其加速寿命试验模型；研究混合材料下球轴承滚动接触问题的快速计算方法；揭示柔性支承下高速球轴承转速、摩擦系数、外部载荷等工况因素对接触角、旋滚比、动刚度、阻力矩等工作特性的影响，为高速球轴承的小摩擦低磨损结构优化设计、性能评估、失效机理和故障诊断等重要工程问题的研究提供理论依据，并为开发新型轴承材料和润滑介质提供理论指导。

高速轴承是航空发动机、精密机床等重大装备的关键零部件，直接关系到整机装备的运行可靠性和工作寿命。在轻量化设计背景下，轴承本身变形会对高速轴承性能产生重大影响。本项目针对柔性支承下高速球轴承摩擦学机理不明朗和理论分析模型不完善的问题，主要开展以下四方面的研究：.1）柔性支承下高速球轴承滚动体/滚道瞬态滚动接触问题，建立柔性变形量与内外接触角的定量关系，建立高速球轴承滚动体/滚道滚滑接触分析的Heathcote滑动模型，继而提出改进的轴承寿命计算模型。.2）柔性支承下高速球轴承滚动体/保持架兜孔和保持架/引导套圈碰擦问题，建立了柔性支承下高速球轴承的碰擦模型，建立了球轴承滚动体/滚道稳态、瞬态滚动接触蠕滑分析模型。通过对6204轴承的全寿命试验，通过混沌动力学方法，提取混沌特征表征柔性支承下高速球轴承的碰擦与疲劳失效现象。.3）柔性支承下高速球轴承蠕滑分析方法与影响因素，定量分析不同种类的油脂在不同温度、不同载荷情况下的蠕滑拖动情况，通过对轴承振动信号的频谱分析，解析油脂的纤维、基础油、水分运动情况。.4）柔性支承下高速球轴承蠕滑拟动力学特性研究，建立柔性支承下高速球轴承的拟动力学模型，对接触角、转速、摩擦力矩、刚度进行详细分析。