The Effects of Geometric Irregularities of Journals on the Performance of Porous Bearings
01 Jun 1994-Vol. 208, Iss: 2, pp 141-145
TL;DR: In the theoretical analysis of porous bearings, the journal has so far been assumed to be ideal, that is perfectly cylindrical as discussed by the authors, but in the present analysis the geometric irregularities of the journal, s
Abstract: In the theoretical analysis of porous bearings the journal has so far been assumed to be ideal, that is perfectly cylindrical. In the present analysis the geometric irregularities of the journal, s...
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TL;DR: In this paper, the effect of geometric imperfections of journal on the performance of micropolar lubricated 4-pocket hybrid journal bearing was theoretically described and numerically simulated results were presented for different forms of geometric irregularities of journal such as barrel shape, bellmouth shape, circumferential undulations along with the ideal shape for both the Newtonian and micropolic lubricant.
Abstract: The present paper theoretically describes the effect of geometric imperfections of journal on the performance of micropolar lubricated 4-pocket hybrid journal bearing The numerically simulated results are presented for different forms of geometric irregularities of journal such as barrel shape, bellmouth shape, circumferential undulations along with the ideal shape for both the Newtonian and micropolar lubricant The numerically simulated results clearly indicate that the geometric irregularities of journal significantly affect the performance of the bearing system The deterioration in bearing performance due to geometric irregularities can be compensated partially by proper choice of lubricant (Newtonian/micropolar) and type of compensating device
26 citations
TL;DR: In this article, the effect of misalignment of journal in conjunction with geometric imperfections of journal on the performance of four pocket hybrid journal bearing system has been investigated and the numerically simulated results indicate that the performance gets significantly deteriorated due to the geometric imperfection and mis alignment of journal.
Abstract: 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.
15 citations
TL;DR: In this article, the authors present an analysis of the performance characteristics of a journal bearing with three-dimensional asperities operating in a turbulent regime, based on the linearized lubrication theory.
Abstract: This paper presents an analysis of the performance characteristics of a journal bearing with three-dimensional asperities operating in a turbulent regime. To model the turbulence, the linearized lubrication theory of Ng and Pan ( J. Basic Eng. (1965) 675–688) is used. The profile of the three-dimensional asperities is modelled in both x and y directions. Numerical simulation results indicate that for bearings of the same load carrying capacity, a longitudinal roughness pattern consumes more power than an isotropic or transverse roughness pattern.
14 citations
01 Feb 2014
TL;DR: In this paper, a theoretical study of geometric imperfections of journal and its influence on the performance of capillary-compensated six-pocket hybrid journal bearing configurations with different geometric shapes of recess is presented.
Abstract: The present paper deals with the theoretical study of geometric imperfections of journal and its influence on the performance of capillary-compensated six-pocket hybrid journal bearing configurations with different geometric shapes of recess. The analysis includes the geometric imperfections of journal such as barrel shape, bellmouth shape, and circumferential undulations and various geometric shapes of recess (square, circular, elliptical, triangular) of same pocket area. The governing Reynolds equation is solved using Galerkin’s technique. The numerically simulated results indicate that the selection of suitable geometric shape of recess is important to have the least influence of different geometric imperfections of journal on the bearing performance.
13 citations
01 Jan 2015
TL;DR: In this article, the influence of journal's geometric imperfections on the performance of a capillary compensated two-lobe hybrid journal bearing system was investigated, and numerically simulated results indicated that non-circularity of bearing and barrel shape irregularity significantly increase the values of S¯zz,C¯zz and ω¯th by a factor 36.47, 51.34 and 18.52%, respectively, with respect to the base bearing (circular ideal journal bearing) operating with non-Newtonian lubricant.
Abstract: The present paper investigates the influence of journal’s geometric imperfections on the performance of capillary compensated two-lobe hybrid journal bearing system. Different geometric imperfections of journal, viz. barrel, bellmouth and circumferential waviness have been included in the study. A parameter called offset factor has been included in the analysis which distinguishes between two lobe and circular journal bearing. Further, the Reynolds equation has been modified by using power law model in order to deal with non-Newtonian effect of the lubricant. The numerically simulated results indicate that non-circularity of bearing and barrel shape irregularity significantly increase the values of S¯zz,C¯zz and ω¯th by a factor 36.47, 51.34 and 18.52%, respectively, with respect to the base bearing (circular ideal journal bearing) operating with non-Newtonian lubricant.
12 citations
Cites background from "The Effects of Geometric Irregulari..."
...There are five undulations (geometric irregularity in circumference direction of journaln1) which have been taken in the analysis.(20) In the case of ideal journal (journal free from geometric irregularities)...
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References
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01 Jun 1962
TL;DR: The theory of the operation of porous metal bearings as given in the 1957 Conference on Lubrication and Wear has now been extended as discussed by the authors, leading to a critical value for a 360° porous bearing.
Abstract: The theory of the operation of porous metal bearings as given in the 1957 Conference on Lubrication and Wear has now been extended. The analysis of a 360° porous bearing leads to a critical value o...
75 citations
59 citations
32 citations
30 citations
TL;DR: In this paper, the applications of the finite-element method for hydrodynamic lubrication of infinite width bearings are presented and compared with an exact solution and a finite difference solution of step bearings, plane slider learnings and journal bearings.
Abstract: Few papers which applied the finite-element method to hydrodynamic lubrication have been published, in spite of many literatures introducing the finite-element method in structural problems. In this paper, the applications of the finite-element method for hydrodynamic lubrication of infinite-width bearings are presented. It is claimed that the finite-element method is able to obtain the accurate results by using a few elements. The finite-element solution is compared with an exact solution and a finite-difference solution of step bearings, plane slider learnings and journal bearings.
28 citations