Magneto-rheological fluid slot-entry journal bearing considering thermal effects

摘要

In recent times, controlling the performance of fluid film bearings smartly has become an important area for the fluid film bearing designers. This study deals with the numerical simulation of a magneto-rheological fluid-lubricated two-lobe hybrid slot-entry journal bearing. To make the operating condition more exact and realistic, the influence of geometric imperfection of the journal arising from manufacturing inaccuracies and thermal effect has been considered. Dave magneto-rheological fluid model, a constitutive relation of the Bingham model, and finite element method have been used in this article to simulate the behavior of the magneto-rheological fluid in a slot-entry bearing. The results indicate that the heat generated because of viscous friction rises the temperature of the magneto-rheological fluid, which changes the bearing performance significantly. Considering barrel-shaped journal and magneto-rheological fluid (applied current, I-c = 4 A), the performance of two-lobe slot-entry bearing is superior in terms of the value of h over bar min,Q over bar ,C over bar 11,C over bar 22,S over bar 11,andS over bar 22 approximately by a magnitude of 2%, 41%, 181%, 168%, 75%, and 41%, respectively, as compared to that of the base bearing (smooth (a over bar 1=a over bar 2=0), two-lobe bearing, operating with a Newtonian fluid, I-c = 0 A).