Effects of Geometric Defects in Journals on Bearing Performance

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

“…Further, the fluid film reactions are computed by integrating the pressure distribution obtained by solving equation (3). The stiffness and damping coefficients are then computed by solving the equations (10) and (12). Using these coefficients, equations of motion (equations (15) and (18)) are solved by fourth order Runge-Kutta method to find the journal center position of geometrically imperfect journal.…”

“…These irregularities are reported by various researchers in their theoretical and experimental analysis of journal bearing systems. [9][10][11][12][13][14][15][16][17][18][19][20][21][22] Salama 9 experimentally and theoretically examined the long wave undulation effect on the parallel-faces thrust bearing performance. The result of his study indicates that the optimum bearing capacity occurred at a constant ratio of wavelength to amplitude.…”

“…Ruddy et al 11 theoretically studied two period waviness influence on both the face and the seat of a mechanical face seal. Sasaki et al 12 with experimental and theoretical analysis determined the influence of axial journal geometries on the bearing performance by calculating oil film pressure distribution and minimum oil film thickness. Radford and Fitzgeorge 13 experimental study concerned with the journal waviness or lobing.…”

Combined influence of geometric irregularities of journal and turbulence on the performance of four-lobe hybrid journal bearing

“…Many researchers have included these irregularities in the theoretical and experimental analysis of fluid film journal bearing. [16][17][18][19][20][21][22][23][24][25][26][27][28][29] Salama 16 examined the effects of macro roughness (periodic irregularities or surface waviness) on the performance of parallel thrust bearing both experimentally and theoretically. Further, Hargreaves 17 also studied the influence of periodic irregularities on the performance of rectangular slider bearing.…”

“…Ruddy et al 19 experimentally examined the effects of two period waviness on the face and seal of a mechanical face seal. Sasaki et al 20 investigated the effects of axial journal geometry (barrel, hourglass and double barrel) on bearing performance through experiment and theoretical analysis. Rasheed 21 studied the performance of plain cylindrical sliding element bearing by considering the surface waviness which is present in journal bearing liners.…”