论文部分内容阅读
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.
Aiming at the friction pair of rolling element and raceway, a mathematic model of point contact unsteady EHL lubrication was established. The change of oil film pressure and film thickness during free vibration was solved by FFT and semi-analytical algorithm. The free vibration model of the damping system is given, and the method of predicting the dynamic characteristics of contact friction pair is given. The change of equivalent stiffness coefficient and damping coefficient of the contact pair is analyzed over a wide range of load and speed. The actual thickness and the thickness of the film during the vibration of the contact body up and down in equilibrium near the equilibrium position, the thickness of the film is closer to the experimental value; The vibration amplitude of the contact body gradually decreases due to the action of the lubricating oil film. The stiffness coefficient increases with the increase of the load parameter, decreases with the increase of the speed parameter, and the variation law of the damping coefficient is complex. Under different loads And the speed range showed a different trend.