不同滑滚比下润滑油膜流变特性试验观察与数值模拟

通过在原有的球-盘接触光干涉润滑油膜测量装置上增设摩擦力测量单元，实现了任意滑滚比下油膜厚度和摩擦系数的同步测量与润滑状态的直观识别. 采用FVA3参考油，分析了不同滑滚比、速度和载荷下的摩擦系数变化规律，并结合油膜干涉图明确了润滑状态与热效应机制，推断出摩擦系数曲面在较低速工况存在混合润滑区域；通过采用基于恢复时间的流变模型对FVA3油品的流变润滑进行数值模拟，并与同等工况下的试验结果进行定量对比，两者取得了良好的吻合性，验证了试验测量的准确性和流变模型的适用性. 

Experimental Observation and Numerical Simulation of Rheological Properties of Lubricating Films under Different Sliding-Rolling Ratios

By supplementing a friction measurement unit to conventional ball-and-disc optical device, the friction coefficient and film thickness were able to be acquired simultaneously under random sliding-rolling ratios. And hence the lubrication state can be well recognized. By employing reference oil of FVA3, the variations of friction coefficient with sliding-rolling ratio, speed and load were analyzed. In combination with interferograms, the lubrication regime and the thermal effect considering in friction measurement were validated. It is also supposed that mixed lubrication regime existed on the 3D map of friction coefficient at low speeds. Finally, a rheology model based on time recovery principle was employed to predict the fiction coefficient and film thickness corresponding to the experimental parameters. Good agreements were achieved between numerical predictions and experimental measurements, confirming both the accuracy of the test method and feasibility of the rheology model.