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Keywords: Journal Bearing
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Journal Articles
Article Type: Research Papers
J. Tribol. June 2022, 144(6): 061803.
Paper No: TRIB-21-1399
Published Online: December 8, 2021
...Shanshan Wei; Yuri Kligerman; Roman Goltsberg; Izhak Etsion A computational fluid dynamics analysis of two-phase flow was used to obtain the distribution of lubricant in a journal bearing, including inlet tube and groove. It was found that for an incomplete starting film, the oil spread-length...
Journal Articles
Article Type: Research Papers
J. Tribol. December 2020, 142(12): 121801.
Paper No: TRIB-19-1480
Published Online: June 26, 2020
...Surojit Poddar; N. Tandon This present article evaluates the state of starvation in a journal bearing using acoustic emission (AE) and vibration measurement techniques. A journal bearing requires a constant supply of oil in an adequate amount to develop a hydrodynamic film, thick enough to separate...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2020, 142(10): 101801.
Paper No: TRIB-19-1380
Published Online: May 18, 2020
...Changmin Chen; Jianping Jing; Jiqing Cong; Zezeng Dai; Jianhua Cheng The position of fluid film in journal bearing will change while the journal moving in bearing, which can be named fluid film boundary migration (FFBM). It is usually ignored in the calculation of linear dynamic coefficients. While...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2020, 142(4): 041801.
Paper No: TRIB-19-1375
Published Online: December 17, 2019
...Chunxing Gu; Xianghui Meng; Shuwen Wang; Xiaohong Ding Surface texturing is one effective means to improve bearing performance. Available studies are mainly focused on the perfectly aligned journal bearing with textures. The studies involving the effect of surface texturing on the misaligned...
Journal Articles
Article Type: Research Papers
J. Tribol. February 2020, 142(2): 021802.
Paper No: TRIB-19-1234
Published Online: November 18, 2019
... Contributed by the Tribology Division of ASME for publication in the J ournal of T ribology . 03 06 2019 16 09 2019 18 09 2019 04 10 2019 journal bearing turbulent lubrication misaligned journal axial motion hydrodynamic lubrication The shaft-bearing systems...
Journal Articles
Article Type: Technical Briefs
J. Tribol. April 2019, 141(4): 044503.
Paper No: TRIB-17-1494
Published Online: February 5, 2019
... the spreadability of additive manufacturing materials. While the load carrying capacity of granular flows has been previously demonstrated, this work attempts to more directly uncover the hydrodynamic-like granular flow behavior in an experimental journal bearing configuration. An enlarged granular lubricated...
Journal Articles
Article Type: Research-Article
J. Tribol. February 2019, 141(2): 021702.
Paper No: TRIB-18-1202
Published Online: October 16, 2018
... conducted using the Pprime Institute bearing test rig. The performance of the same two-lobe journal bearing (preload 0.524) as used in a previous study, lubricated with ISO VG 46 oil, was evaluated. Scratches of different depths (varying as a function of the radial clearance) were directly machined onto...
Journal Articles
Article Type: Technical Briefs
J. Tribol. October 2014, 136(4): 044502.
Paper No: TRIB-14-1058
Published Online: July 15, 2014
... of lubricated bearings? The answer is yes, being the volumetric heat capacity an important parameter. In this work, the static behavior of journal bearings is studied when nanoparticles are added to the lubricant. A thermohydrodynamic analysis is performed with oil ISO VG68 (base fluid) and six different...
Journal Articles
Article Type: Research-Article
J. Tribol. January 2013, 135(1): 011702.
Paper No: TRIB-12-1047
Published Online: December 20, 2012
... in the K yx coefficients (coefficients that change from positive to negative values as Sommerfeld number increases). The K yx coefficients of the optimized bearings change sign at higher Sommerfeld numbers than that of the journal bearing and, after that, the absolute values...
Journal Articles
Article Type: Hydrodynamic Lubrication
J. Tribol. July 2012, 134(3): 031704.
Published Online: June 19, 2012
... analysis of the short journal bearing is developed. Pressure profiles and linearized stiffness, damping and mass coefficients are calculated for different operating conditions. A time transient solution is developed. The change in the rotor displacements when subjected to unbalance forces is explored...
Journal Articles
Article Type: Technical Briefs
J. Tribol. January 2012, 134(1): 014504.
Published Online: February 24, 2012
...T. V. V. L. N. Rao The purpose of this paper is to present the linearized stability analysis of two-layered fluid film in the journal bearing. In this work, a modified classical Reynolds equation is derived under dynamic conditions consisting of two layers of fluid film described by Newtonian...
Journal Articles
Article Type: Technical Briefs
J. Tribol. July 2011, 133(3): 034501.
Published Online: June 17, 2011
...Roberto Bassani This chapter deals with a hydrodynamic journal bearing provided with hollow bushings, capable of supporting very high loads, even at low speeds, at which separation between the shaft and the housing’s bushing is induced by a specific self-regulating hydrostatic system. The same...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2011, 133(1): 011101.
Published Online: December 3, 2010
... layer between contacting bodies with a specified gap conductance to partition the frictional heat. Application of the model to the heat transfer analysis of journal bearing systems experiencing oscillatory motion is presented. Nonuniformly distributed frictional heat along the axial direction...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2010, 132(4): 042101.
Published Online: October 7, 2010
... was developed to predict bearing performance under the mixed lubrication condition in microgrooved journal bearings. Oil film thickness distributions, hydrodynamic and contact pressure distributions, and real contact area between the journal surfaces and the bearing surfaces with microgroove were obtained...
Journal Articles
Article Type: Technical Briefs
J. Tribol. April 2010, 132(2): 024503.
Published Online: March 25, 2010
...R. K. Naffin; L. Chang This paper presents an analytical model for the basic design calculations of plain journal bearings. The model yields reasonable accuracy as compared with published numerical solutions under the same conditions. The principles and procedures of the formulations are presented...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011704.
Published Online: December 10, 2009
...Jun Sun; Mei Deng; Yonghong Fu; Changlin Gui Journal misalignment exists generally in journal bearings. When severe journal misalignment takes place, the minimum film thickness of journal bearings reduces greatly. In this condition, the surface roughness, the oil viscosity-pressure relationship...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2010, 132(1): 011703.
Published Online: November 17, 2009
...Hiromu Hashimoto; Masayuki Ochiai This paper describes the stabilization method for small-bore circular journal bearings using starved lubrication. First, we describe the experimental examination to confirm the effect of supply oil conditions on stability of circular journal bearing by using a high...
Journal Articles
Article Type: Technical Briefs
J. Tribol. January 2010, 132(1): 014501.
Published Online: November 10, 2009
...T. V. V. L. N. Rao In this paper, pressure and shear stress are derived under steady state using one-dimensional analysis of the single-grooved slider bearing and journal bearing with partial slip on the stationary surface. The Reynolds boundary conditions are used in the analysis of journal...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2009, 131(1): 011705.
Published Online: December 4, 2008
...Hiromu Hashimoto; Masayuki Ochiai Journal bearings are widely used for supporting high-speed rotating machinery, such as turbine, compressor, and HDD spindle, because of their high load carrying capacity, stability, and durability. Recently, the engineering trend is oriented to higher speed...
Journal Articles
Article Type: Research Papers
J. Tribol. January 2009, 131(1): 011701.
Published Online: November 20, 2008
...M. M. Nemat-Alla, Ph.D.; A. M. Gad; A. A. Khalil; A. M. Nasr Recently, herringbone-grooved journal bearings (HGJBs) have important applications in high-speed rotating machinery. The groove action in pumping the lubricating fluid inward generates supporting stiffness and improves the stability...