摘要
研究滚滑工况下两波动表面间的椭圆接触微弹流润滑问题,建立两接触表面均有连续波动的粗糙度模型,求得热条件下的完全数值解。假设卷吸速度沿接触椭圆短轴方向,快速运动表面的速度是另一表面的4倍,表面纹理相似的两波动表面间的微弹流润滑大多是周期性时变问题,以准稳态解为初始条件,逐个周期求得时变热解。讨论不同方向的表面微观连续波动对润滑性能的影响,并将牛顿和非牛顿模型的数值结果进行比较。结果表明,波动表面间接触区里的压力、膜厚、温升等呈现特定的特征,两表面波动皆为纵向纹理时,润滑膜厚度最小润滑条件最恶劣;热效应和非牛顿效应在微弹流问题中都很明显。
The lubricating behavior in the rolling/sliding elliptic contact composed of two wavy surfaces was investigated theoretically by establishing the roughness model and with full numerical solutions of the micro-thermal EHL.It was assumed that the entrainment velocity was along the minor axis of the Hertzian contact ellipse,and the velocity of faster surface was four times as that of the slower surface,most EHL problems of two similar wavy surfaces were cyclic time-dependent.Started from a quasi-steady solution,the cyclic solution was achieved numerically time step by time step and period by period.The influence of different surface waviness on the lubricating behavior was discussed and the results using the non-Newtonian lubricant model were compared with that of Newtonian model.The results show that,the distributions of pressure,film thickness and temperature show corresponding features.The worst lubrication condition with the thinnest oil film corresponds to the case where both surfaces have vertical waviness;and the thermal and non-Newtonian effects can be enlarged significantly by the surface waviness.
出处
《润滑与密封》
CAS
CSCD
北大核心
2010年第12期48-52,共5页
Lubrication Engineering
基金
国家自然科学基金资助项目(50705045
50875137)
关键词
波动表面
微弹流
热效应
非牛顿效应
时变问题
wavy surface
micro-EHL
thermal effect
non-Newtonian effect
time-dependent problem
