【摘要】 给出了无限长轴承油膜力的解析表达式，证明了雷诺边界条件等价于雷诺方程的双重变分．且给出了雷诺方程变分形式的解析表达式．最后用有约束优化方法来确定完整油膜区的边界，得到无限长轴承是全周油膜的结论．并通过一个绕静偏心作同频涡动的转子作为算例进行检验，同时与不同宽径比的有限长轴承数值结果进行了比较更多还原

【Abstract】 The formulation of oil film forces for long journal bearing has been worked out. The free boundary associated with the Reynolds boundary condition is proved to be equal with a variation to boundary.In finial the method to determine oil film boundary is given by constrained optimization,the 2π oil film is gained by a example and compare to numerical result as well.更多还原