Dynamic analysis of a 2-lobe geometrically imperfect journal bearing system

Abstract

The present study is concerned with the linear and nonlinear transient motion analysis of a 2-lobe geometrically imperfect hybrid journal bearing system compensated with constant flow valve restrictor. The trajectories of journal center motion for a geometrically imperfect rotating journal (barrel, bellmouth and undulation type journal) have been numerically simulated by solving the linear and nonlinear equations of motion of journal center using a fourth order Runga–Kutta method. The numerically computed results for the journal center trajectories indicate that the 2-lobe bearing [Formula: see text] is more stable with geometrically imperfect journal as compared to the circular bearing with imperfect journal.

Effect of CSL on the characteristics of six-pocket hybrid irregular journal bearing

“…Geometric and operating parameters of hybrid irregular JBS. 1,2,7,16,17,22 Number Further, with an increase in journal speed, the journal center displacements in x direction increases while in z direction reduces i.e. results in the reducing trend in the value of " S xx and rising trend in the value of " S zz with respect to the journal speed.…”

“…The studies [3][4][5] considered the influence of journal's irregularities on the characteristics parameters of hydrodynamic JBS. Recently, the studies [6][7][8][9][10][11] investigated the effect of journal's irregularities on the behavior of four-pocket hybrid JBS including the influence of micropolar lubricant, 11 power law lubricant, 6 ellipticity of bearing 7 and turbulence, 8 and journal misalignment. 9,10 The studies [3][4][5][6][7][8][9][10][11] reveal that the bearing characteristics (viz.…”

Effect of partial surface waviness on the dynamic and stability performance of journal bearing

“…Khatri and Sharma 27 investigated the impact of spherical-shaped texturing on the dynamic performance of a hole-entry hybrid bearing and reported the enhancement of threshold speed and dynamic coefficients for fully textured distribution. Furthermore, several studies [28][29][30][31][32][33][34][35][36][37] have shown that several geometrical flaws, non-circular bearings, different journal shapes, lobe bearings, curved bearings, surface texturing and so forth influence the bearing operation.…”