Analysis of elliptical dam bearing lubricated with micropolar fluid

Abstract

Purpose This paper aims to evaluate the theoretical performance of elliptical dam bearing (EDB). The objective of this paper is to study the influence of eccentricity ratio, dam parameters and micropolarity parameters on the stability of EDB with respect to micropolar lubrication. Design/methodology/approach In this study, the modified Reynolds’ equation for dynamic state is solved using the finite element method and Galerkin technique. A MATLAB code is written to compute pressure and stability and also to analyse the characteristics. The stability parameters of an EDB are computed for selected values of eccentricity ratios at four levels in the range of 0.20 to 0.35 and for length-diameter ratio of 2.0. Findings The results from stability analysis reveal that micropolar lubricated EDB provides better stability at smaller material length due to increased effective viscosity. Hence, it is better to select the smaller characteristic length and higher dam width to achieve optimum performance of these bearings. Originality/value Very few researchers investigated the effects of working eccentricity, bearing dam and micropolar fluid parameters on the EDB in the past. It is important to study these aspects for optimum performance of bearings.

Micropolar lubricant effects on the performance of partial journal bearings

“…In the dynamic analysis of micropolar lubricated offset bearing, Sharma and Krishna 37 concluded that higher offset provides better stability in terms of threshold speed. Very recently, the stability of micropolar lubricated elliptical dam bearing was presented by Sharma et al 38 Above studies [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] reflect that micropolar lubrication provides improved static and dynamic performance of circular and non-circular journal bearing configurations, as compared with Newtonian lubrication.…”

Stability analysis of partial journal bearings lubricated with micropolar fluid

“…They observed that the higher offset provides better stability in terms of increased threshold speed and decreased whirling. The stability of the elliptical bearing, considering the dam in the upper half, was computed by Sharma et al (2022). They presented the effect of dam and fluid parameters on stability parameters such as critical mass, threshold speed and whirling ratio.…”