A study of misaligned hole‐entry worn journal bearing operating in turbulent regime

Abstract

Purpose -The purpose of this paper is to study theoretically the combined influence of journal misalignment and wear on the performance of a holeentry hybrid journal bearing system. The bearing is assumed to be operating in a turbulent regime. Design/methodology/approach -The modified Reynolds equation based on Constantinescu lubrication theory has been solved by using finite element method together with orifice and capillary restrictors flow equations as a constrain together with appropriate boundary conditions. Findings -It has been observed that for a symmetric hole-entry journal bearing configuration the value of h min is more for the bearing compensated by orifice restrictor as compared to capillary restrictor when bearing operates in turbulent regime under worn/unworn conditions. From the point of view of stability threshold speed v th , the reduction in the value of v th for capillary compensated bearing is around 2 3.89 percent whereas for orifice compensated bearing it is 27.85 percent when misaligned worn bearing is operating in turbulent regime.Originality/value -The present work is original of its kind, in case of misaligned hole-entry worn journal bearing. The results are quite useful for the bearing designer.

A study on performance of slot entry hybrid journal bearing considering effect of surface irregularities

“…In this study, the governing Reynold’s equation is solved by Galerkin’s method of finite element analysis, and an appropriate iterative solution procedure is used to establish the matched steady-state solution of the lubricant flow region with suitable boundary conditions. The computation of unknown fluid film pressure is obtained by solving global system equation (equation 7) (Ram and Sharma, 2013). In this method, complete fluid film domain is discretized into finite element subdomain as shown in Figure 2(b) and (c).…”

On the Characteristics of Misaligned Journal Bearings

“…They found that the friction coefficient generally increases with increasing wear depth as well as misalignment and Sommerfeld number. Ram and Sharma [120] in 2013 studied the combined influence of journal misalignment and wear on the performance of a hole-entry hybrid journal bearing system under turbulence theoretically. They solved modified Reynolds equation based on the Constantinescu lubrication theory by using the finite element method together with orifice and capillary restrictors flow equations as a constraint.…”

Influence of wear on the performance of capillary compensated hole entry hybrid conical journal bearing

“…Afterword, Awasthi et al (2007) studied the performance of non-recessed hybrid journal bearing with the effect of wear due to start and stop operations. Thereafter, Ram and Sharma (2013) presented theoretical study concerning combined influence of misalignment and wear on the performance of hole entry hybrid journal bearing.…”