A study of capillary-compensated geometrically imperfect six-pocket hybrid journal bearing of various geometric shapes of recess
01 Feb 2014-Vol. 228, Iss: 2, pp 170-186
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.
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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.
25 citations
TL;DR: In this article, the effect of shape errors on the dynamic behavior of externally pressurized air journal bearings is studied and a semi-implicit numerical scheme is used in order to reduce the computing time.
19 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.
15 citations
TL;DR: In this article, the influence of geometric irregularities on the performance of membrane compensated four pocket journal bearing under misaligned conditions is examined and the unknown fluid film pressure field in governing Reynolds equation is obtained by FE analysis using Gallerkin's technique.
14 citations
06 Apr 2015
TL;DR: In this article, the influence of geometric irregularities of journal (barrel type, bellmouth type and undulation type) on the performance of capillary compensated four-lobe multirecess.
Abstract: The present study deals with the influence of geometric irregularities of journal (barrel type, bellmouth type and undulation type) on the performance of capillary compensated four-lobe multirecess...
10 citations
References
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TL;DR: In this article, a theoretical study concerning the performance of an externally pressurized multirecess hydrostatic/hybrid flexible journal bearing system by varying the geometric shape of recess and using the membrane flow valve restrictor as a compensating element is presented.
68 citations
TL;DR: In this article, four hybrid bearings having different geometric configurations were experimentally tested for their static and dynamic characteristics, including flowrate, load capacity, rotordynamic coefficients, and whirl frequency ratio.
Abstract: In this study, four hybrid bearings having different geometric configurations were experimentally tested for their static and dynamic characteristics, including flowrate, load capacity, rotordynamic coefficients, and whirl frequency ratio. The four bearings included a square-recess, smooth-land, radial-orifice bearing (baseline), a circular-recess bearing, a triangular-recess bearing, and an angled-orifice bearing. Each bearing had the same orifice diameter rather than the same pressure ratio. Unique to these test results is the measurement of the added mass terms, which became significant in the present tests because of high operating Reynolds numbers. Comparisons of the results were made between bearings to determine which bearing had the best performance
54 citations
"A study of capillary-compensated ge..." refers background in this paper
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TL;DR: In this paper, a computer-aided study of static and dynamic performance characteristics and linear and nonlinear transient motion analysis of a flexible shell journal bearing system is presented, where trajectories of the journal-centre motion have been drawn to predict the transient response of the system.
48 citations
TL;DR: In this article, the performance of a four pocket orifice compensated hydrostatic/hybrid journal bearing system with various geometric shapes of recess operating with micropolar lubricant was analyzed.
47 citations
TL;DR: In this article, the effect of bearing shell deformation on the static and dynamic performance characteristics of a four pocket capillary-compensated hydrostatic journal bearing have been studied, where the finite element method has been used to solve the Reynold's equation governing the lubricant flow in the clearance space of a hydrostatic bearing and the three-dimensional elasticity equations governing the displacement field in the bearing shell.
43 citations