非稳态弹流润滑状态下滚动体-滚道摩擦副的动力特性研究  

Dynamic Behaviors of Rolling Element-Raceway Tribopairs under Transient Elastohydrodynamic Lubrication

作　　者：张玉言[1] 王晓力[1] 闫晓亮[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《摩擦学学报》2012年第6期626-633,共8页Tribology

基　　金：国家自然科学基金(51275046);北京自然科学基金(3102025)资助~~

摘　　要：针对滚动体-滚道摩擦副,建立了点接触非稳态弹流润滑数学模型,利用FFT技术和半解析算法数值求解了接触体在自由振动过程中油膜压力和膜厚的变化,同时结合有阻尼系统的自由振动模型,给出了预测点接触摩擦副动力特性的方法,在较宽的载荷和速度范围内分析了接触副的等效刚度系数和阻尼系数的变化.结果表明:根据接触副的实际工作载荷和速度所确定的无量纲自然频率来进行非稳态弹流的计算所得到的膜厚结果更接近实验值;在接触体的振动过程中油膜的压力和厚度在平衡位置附近上下波动,且由于润滑油膜的作用接触体的振动幅值逐渐减小;刚度系数随载荷参数的增加而增加,随速度参数的增加而减小,而阻尼系数的变化规律较复杂,在不同的载荷和速度范围内呈现出不同的变化趋势.The transient elastohydrodynamic lubrication （EHL） model of point contacts between the rolling element and raceways was developed. The variations of film pressure and thickness under free vibrations of the contact solid were numerically solved based on the FFT method and semi - system approach. Simultaneously, the free vibration model of damping systems was combined and the method for predicting the dynamic behaviors of point contact tribopairs was presented. The variations of equivalent stiffness and damping coefficients were analyzed under wider load and speed ranges. The results demonstrate that the transient film thickness calculated in the EHL model using the dimensionless natural frequency which was determined by the working load and speed was more close to the experimental values. The film pressure and thickness fluctuated in the vicinityof the equilibrium position and the amplitude of the contact solid decayed because of the effects of the lubrication film. The stiffness increased with the increasing load and decreased with speed. However, the changes of the damping were complex, which were different in various load and speed ranges.

关 键 词：滚动体-滚道摩擦副 非稳态弹流润滑 刚度 阻尼 

分 类 号：TH117.2[机械工程—机械设计及理论]