基于同心旋转圆柱间 Oldroyd- B型流体的六维动力系统 ,探讨了小间隙大扰动条件下高分子添加剂对滑动轴承间油膜非线性稳定性的影响 .结果表明 ,弱弹性流体的失稳结构与牛顿流体相似 ,随着转速的增加 ,流体以同宿轨道分岔失稳 ,与牛顿流体相比 ,少量的高分子添加剂具有推迟流体层流失稳的作用 Based on the six-dimensional dynamic system of the Oldroyd-B fluid between concentric rotating cylinders, the effect of polymer additives on the nonlinear stability of the oil film between sliding bearings under small-gap large disturbance is investigated. The results show that the instability structure of weakly elastic fluid Newtonian fluid is similar, with the rotation speed increases, the fluid bifurcates in the same orbital instability, compared with the Newtonian fluid, a small amount of polymer additives have the function of postponing the instability of the fluid laminar flow