An efficient calculation method of nonlinear fluid film forces in journal bearing

摘要

An efficient method of fluid film force database is proposed for a single pad of the journal bearing. By some manipulations on Reynolds equation, a speed parameter varying within (-1, +1) is introduced to reflect the relative weights of the bearing journal's rotation and squeezing effects. Given the bearing aspect ratio and pad angle, the fluid film force database can be easily established. For a multi-pad journal bearing, an algorithm is needed to sum the separate fluid forces generated in every pad. An elliptic bearing supporting a rigid rotor is employed to examine the effectiveness of the suggested method. The results based on the numerical solution of Reynolds equation is taken as a yardstick for comparison. It is shown that the database method provides a way to obtain the bearing fluid forces quickly without losing accuracy.