大滑动速度下弹流线接触的摩擦力问题

本文给出了一个滚动伴随滑动的滚子在弹流润滑工况下的非等温效值解。该解对能量方程进行了更全面、仔细的分析，既考虑了第二粘度系数的影响，又考虑了润滑油压缩生热的影响。在描述润滑油的粘压－粘温关系时，既采用了巴鲁士公式，又采用了茹兰兹公式，并作了对比。并在双盘试验机上测定摩擦系数。同时，还对时间相关粘度假说和艾林流体模型的影响进行了研究。理论计算结果表明，第二粘度系数和压缩生热对摩擦系数的影响很小，可以忽略不计。茹兰兹公式的应用可以使理论摩擦系数比用巴鲁士公式时小得多，更接近于实验数值，但是仍存在很大差异。结果还表明，牛顿流体模型和时间相关粘度假说都不能很了地解释弹流接触区的摩擦力特性。唯一能够解释这一特性的是艾林模型，其与实验数值之偏差只有10%左右。

TRACTION IN AN EHD LUBRICATED LINE CONTACT AT HIGH SLIDING SPEEDS

n this paper, a numerical solution of; the thermal-elastohydrodynamic lubrication of, rolling-and sliding cylinder is extended by considering more rigorous analysis of the energy, equation, including the effects of the second coefficient of viscosity and the heat arising from compression of the lubricant. Both the Barus and Roelands equations to describe the pressure-temperature dependency of viscosity have been used during the calculation. Mea .surements of the coefficient of friction have also been carried out on the two-disc machine. At the same time, the effects of applying the time-dependent viscosity model and the By ring fluid model have been studied. The theoretical results predicted by this model show that the second coefficient of viscosity and the heat from compression of the lubricant only have such a small influence on the coefficient of friction that their effects can be neglected. The applying of Roelands, equation can make the predicted coefficient of friction much smaller than by applying Barus equation and fit the experimental results much better. However, the discrepancy between the theory and experiments is still quite large. The results also show that both Newtonian fluid model and the time-dependent model couldn't explain the tractive behaviour well. The only model which can predict the tractive behaviour is Eyring model, the descrepancy of which comparedwith experimental results. Is only about 10%.