The present study examines the influence of geometric irregularities on the performance of membrane compensated four pocket journal bearing under misaligned conditions. Geometrically irregular journal in form of barrel shape, bellmouth shape and circumferential undulated shape and three misaligned conditions viz. Mx, Mz and Mxz are considered in the analysis. The unknown fluid film pressure field in governing Reynolds equation is obtained by FE analysis using Gallerkin's technique. Numerically simulated characteristics of bearing system depict that presence of geometric irregularities of journal may influence the behavior of journal bearing operated in misaligned conditions. © 2017 Elsevier Ltd

Rajput A.K.

Yadav S.K.

Sharma S.C.

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Tribology International

In the present work, an investigation has been performed on a rigid rotor supported by two-lobe journal bearings operating with a non-Newtonian lubricant. The governing Reynolds equation for pressure field is solved by using non-linear finite element method. Further to study the dynamic stability of the bearing system, governing equation of motion for the rotor position is solved by fourth order Runge–Kutta method. Bifurcation and Poincaré maps of two-lobe bearings are presented for different values of the non-Newtonian parameter and bearing ellipticity ratio. The numerical results illustrate that the ellipticity of a bearing with a dilatant lubricant improve the stability of the rotordynamic system. © IMechE 2018.

Fulltext

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology

Stability analysis of a rigid rotor supported by two-lobe hydrodynamic journal bearings operating with a non-Newtonian lubricant

The present study investigates the effect of misalignment of journal in conjunction with the effect of geometric imperfections of journal on the performance of four pocket hybrid journal bearing system. Three types of geometric imperfections of journal viz. barrel shape, bellmouth type and undulated type are considered. The misalignment of the journal is incorporated in the analysis by using two parameters φ¯ and Ψ¯. The governing Reynolds equation is solved by using a Galerkin's technique. The numerically simulated results indicate that the performance of a journal bearing system gets significantly deteriorated due to the geometric imperfections and misalignment of journal. © 2016 Elsevier Ltd. All rights reserved.