Impact of partial surface waviness on the tribological performance of hydrodynamic journal bearing

Abstract

In this paper, the static performance analysis of journal bearing having full and partial surface waviness has been presented. The surface waviness is to be considered in the full, first half, second half, and pressure-increasing and decreasing regions of the bearing for analysis. The effect of surface waviness is considered by modifying the lubricant flow governing Reynolds equation with the film thickness equation and it is solved with the finite element method to get performance parameters like bearing load capacity, friction coefficient, and so forth operating under eccentricity ratios range of 0.2-0.8. The waviness geometrical parameters like waviness numbers and amplitudes are also considered in circumferential, axial, and both directions in the selected regions. The maximum performance has been found for waviness in the full and pressureincreasing region in the circumferential direction at a high eccentricity ratio.

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

“…Now as per our recorded literature related to surface waviness, no study found related to the effect of partial surface waviness on journal bearing's dynamic and stability performance. The goal of the present work is to fill this gap and it is also an extension of the published work 24 which reported enhancement in the static performance of the journal bearing due to partial waviness in different regions of the bearing surface. In the present numerical study, the dynamic and stability performance of journal bearing with partial waviness in different regions, such as full, upper half, lower half, pressure rising and reducing region, as illustrated in Figure 3a,b, with different wave number and wave amplitudes have been evaluated at an average eccentricity ratio of 0.6.…”

“…Yang et al 22 observed the dynamic behaviour of the wave bearing using the finite difference method and Reynolds equation and revealed that waviness influences the bearing stability. Bangotra and Sharma 23,24 reported that the surface waviness and the use of lubricant additives and the partial surface waviness enhance the static performance of journal bearings.…”

Performance analysis of journal bearing having surface waviness operating under misaligned condition

“…It was discovered that irregularities increase the value of minimum fluid film thickness and lubricant flow. Bangotra and Sharma 11,12 reported that due to the surface waviness, the load capacity increases, and the COF reduction and surface waviness in the pressure region is more effective in the circumferential direction than the axial direction.…”