考虑温粘热效应的多瓦轴承模型及其应用

构筑了轴向解析、周向有限元压力分布的一维变粘度场有限宽轴承模型。在绝热边界条件下,忽略泊肃叶流项对速度的影响,不考虑温度轴向变化并沿油膜厚度方向积分,三维能量方程可降阶为平均温度场只沿周向分布的一维形式,结合滑动轴承非线性油膜力的一维直接解法,能量方程与雷诺方程可分别求解,既考虑了温粘效应对滑动轴承非线性动力学性能的影响,又提供了无需迭代直接确定油膜破裂边界和求解非线性油膜力的快速新方法。作为应用,针对进油槽位于水平两侧的椭圆瓦轴承进行了动力润滑热效应分析,与工程数据比较,计算结果吻合,证明该模型合理,适用于工程上多瓦轴承的分析计算。

Model and application of thermal effects in multi-arc journal bearings

An one-dimensional variable viscosity field model of finite journal bearing was built.The model was defined by analysis formula in the axial direction and was distributed by finite element in the circumferential pressure direction.It was assumed that the Poiseuille component of velocity could be neglected and that the temperature variation in the axial direction was negligibly small,the three-dimensional energy equation could be reduced to the one-dimensional form by integrating across the film.The Reynolds equation and the energy equation were solved respectively.The energy equation gives the distribution of the circumferential mean temperature field subjected to an adiabatic boundary condition at the oil-bush interface.The analysis of the thermohydrodynamic effects of the lubricating film in a journal bearing was concerned and a rapid numerical algorithm of direct solution method for solving the Reynolds equation was derived.As an application,the thermohydrodynamic analysis for the elliptical journal bearing with two axial grooves in the horizontal direction are presented.Good agreement between theoretical and the engineering applied data is achieved.The new model is reasonable and suitable in engineering multi-arc journal bearings analysis.