Wear simulation for the journal bearings operating under aligned shaft and steady load during start-up and coast-down conditions

Chun, Sang Myung; Khonsari, M. M.

doi:10.1016/j.triboint.2016.01.042

Cited by 68 publications

(27 citation statements)

References 25 publications

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“…It is also important to mention that right after start-up (between 0 and 5 s) the transient temperature change is the smallest due to the small heat generated in the fluid film, making it negligible on the whole time domain. Meanwhile the transient term of the heat equation in the solids cannot be neglected [8][9][10][11].…”

Section: Elrod's Model In the Thermohydrodynamic (Thd) Regimementioning

confidence: 99%

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Experimental and Numerical Analysis on the Seizure of a Carbon-Filled PTFE Central Groove Journal Bearing during Start-Up Period

et al. 2018

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During the start-up period, if the journals bearing bushing and shaft materials have different heat conductivities, the thermal expansion of the shaft might be more rapid than that of the bushing. This reduces the radial clearance between the bearing components and generates higher shear stresses in the lubricating fluid, which can lead to bearing seizure, resulting in the deterioration of the journal bearing.(1) First, we present an experimental case study of the seizure of a central groove journal bearing with a carbon-filled polytetrafluoroethylene (PTFE) bushing and a steel shaft; (2) Then, a static thermoelastohydrodynamic (TEHD) simulation is compared to Cristea's experiments (Cristea, A.-F., 2012); (3) Then, a pseudo-transient TEHD simulation is performed in order to numerically predict the observed phenomena on the test rig; (4) Finally, the evolution of the oil flow rate and the bushing temperatures during the start-up period determined with the pseudo-transient TEHD modelling are compared to the experimental data of the test rig. The pressure field is determined with the thermohydrodynamic (THD) Elrod's modelling, with Vijayaraghvan's robust solver algorithm. The pseudo-transient temperature field in the bearing components as well as the thermal and mechanical deformations are calculated with a commercial software.

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Section: Elrod's Model In the Thermohydrodynamic (Thd) Regimementioning

confidence: 99%

“…Another transient phenomenon in the functionality of journal bearings is the cumulative wear: in 2016, Chun and Khonsari published a numerical study [11] on rod bearing wear. They found that the roughness of the surfaces in contact and the direction and magnitude of the load changes the wear.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis on the Seizure of a Carbon-Filled PTFE Central Groove Journal Bearing during Start-Up Period

et al. 2018

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“…This and tentative necessary re-meshing is performed by external scripts, which are used in addition to the simulation software. Several authors [12][13][14][15][16][17] use the wear model according to Archard and Hirst [18] to calculate the extent of wear. Furthermore energetic approaches are reported [19].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Wear Phenomena of Journal Bearings by Close to Component Testing and Application of a Numerical Wear Assessment

et al. 2018

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Hydrodynamic journal bearings are subjected to progressively rough loading conditions leading to an increased share of operation in mixed and boundary lubrication. This results in increased frictional losses, additional wear and a higher chance of failure, which calls for the understanding of wear processes and the necessity of a numerical assessment. We conducted wear investigations of journal bearings by making use of a close-to-component test setting, and the progress of wear could be linked to the introduced frictional energy and in combination with a comprehensive surface analysis tribological effects could be resolved in detail. Achieved wear coefficients were implemented in a novelly developed numerical framework, which allows for the dynamic numerical evaluation of operation in the fluid and mixed lubrication regime and simultaneously occurring wear processes. By comparing numerical and experimental results, we evaluated the numerical framework's capability to conduct holistic simulations including aspects like dynamically changing operation conditions, fluid and mixed lubrication as well as wear.

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“…The study showed that when considering the real wear defect, the theoretical results can agree well with the experimental data. Chun and Khonsari [7] presented a wear study of the journal bearing for a single-cylinder engine during start-up and coast-down. The study showed that after one turn on and off of an ignition switch, the accumulated wear volume will increase with the increasing surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Effects of bushing profiles on the elastohydrodynamic lubrication performance of the journal bearing under steady operating conditions

Liu¹,

Zhao²,

Li³

et al. 2019

Mechanics & Industry

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The bushing profiles have important effects on the performance of journal bearing. In this article, the effects of plain profile, double conical profile, and double parabolic profile on the elastohydrodynamic lubrication of the journal bearing under steady operating conditions are investigated. The journal misalignment and asperity contact between journal and bushing surface are considered, while the modification of the bushing profiles due to running-in is neglected. Finite element method is used for the elastic deformation of bushing surface, while the numerical solution is established by using finite difference method and overrelaxation iterative method. The numerical results reveal that the double parabolic profile with appropriate size can significantly increase the minimum film thickness and reduce the asperity contact pressure and friction, while the maximum film pressure, load-carrying capacity, and leakage flow rate change slightly under steady operating conditions. This study may help to reduce the edge wear and prolong the service life of the journal bearing.

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Wear simulation for the journal bearings operating under aligned shaft and steady load during start-up and coast-down conditions

Cited by 68 publications

References 25 publications

Experimental and Numerical Analysis on the Seizure of a Carbon-Filled PTFE Central Groove Journal Bearing during Start-Up Period

Experimental and Numerical Analysis on the Seizure of a Carbon-Filled PTFE Central Groove Journal Bearing during Start-Up Period

Evaluation of Wear Phenomena of Journal Bearings by Close to Component Testing and Application of a Numerical Wear Assessment

Effects of bushing profiles on the elastohydrodynamic lubrication performance of the journal bearing under steady operating conditions

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