微极性流体螺旋槽径向轴承油膜稳定性

给出了以微极性流体为润滑剂的径向滑动轴承油膜压强摄动方程，并采用有限元法研究螺旋槽径向轴承油膜稳定性。在此基础上计算了螺旋槽径向轴承油膜刚度系数、阻尼系数和不涡动的转子临界质量，微极性流体的特性由耦合数和分子特征长度两个参数决定。研究表明，微极性流体螺旋槽径向轴承比一般牛顿流体为润滑剂的轴承油膜具有更好的稳定性，高耦合数时，润滑油膜厚度和微极性流体分子特征尺度的比值越小，轴承油膜的稳定性越好．

Film stability of herringbone grooved journalbearing with micro-polar lubricants

The film pressure perturbation equation of journal bearing with micro-polar lubricants was given, and finite element method was employed to study film stability of herringbone grooved journal bearing with micro-polar lubricants. The film stiffness coefficients, damping coefficients and critical rotor mass were calculated based on the pressure perturbation equation. Micro-polar fluids were characterized by coupling number and molecular size. The study showed that the film stability of journal bearing with micro-polar fluid was generally better than that with Newtonian fluid. When there is high coupling number, smaller ratio of film thickness to molecular size of micro-polar fluids leads to better film stability.