Study on the tribo-dynamic performances of water-lubricated microgroove bearings during start-up

Xiang, Guo; Han, Yanfeng

doi:10.1016/j.triboint.2020.106395

Cited by 45 publications

(17 citation statements)

References 31 publications

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“…Although a short acceleration time can reduce the rough contact pressure, it leads to a larger temperature rise. 21 Wear caused by repeated sliding friction is inevitable until the two surfaces are completely separated, and a higher temperature rise is generated. 22,23 Therefore, the wear behavior of journal bearings under mixed lubrication has attracted extensive attention from researchers.…”

Section: Introductionmentioning

confidence: 99%

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Transient tribo-dynamic performance of journal bearings considering wear behavior during start-up

Wei

Liao

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The transient tribo-dynamics and wear model are coupled to study the mixed lubrication-wear behavior during start-up. The coupled numerical model involves the film thickness equation with wear depth and a time-varying wear coefficient to account for the impact of transient mixed lubrication behavior on wear. In this study, the evolution of wear and mixed lubrication performance distribution over time is predicted, and the impact of acceleration mode, acceleration time, external load, lubricant viscosity, and start-up time on the numerical predictions is evaluated. The findings demonstrate that wear behavior, particularly in the analysis of the effects of acceleration mode and acceleration time, has a significant impact on the evaluation of the bearing-rotor system's start-up performance and even changes the determination of optimal parameters. Furthermore, the parametric study demonstrates that wear and mixed lubrication performance are sensitive to the external load and lubricant viscosity. Finally, studies on the effect of start-up times show that proper wear geometry promotes hydrodynamic effects, but severely worn bearing surfaces have a negative effect on start-up.

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Section: Introductionmentioning

confidence: 99%

“…Although a short acceleration time can reduce the rough contact pressure, it leads to a larger temperature rise. 21…”

Section: Introductionmentioning

confidence: 99%

Transient tribo-dynamic performance of journal bearings considering wear behavior during start-up

Wei

Liao

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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show abstract

“…Next, Guo et al [34,35] utilized experiments to analyze the impact of spherical-platform texture parameters on the friction coefficient, wear mass loss, and surface topography of the bearings under different external loads and rotational speeds. Xiang et al [36,37] further examined the effect of micro-groove parameters on the transient lubrication properties of journal bearings. The results show that micro-grooves with reasonable parameters have a remarkable impact on the tribological behavior of journal bearing systems.…”

Section: Introductionmentioning

confidence: 99%

Effects of manufacturing errors and micro-groove surfaces on the static and dynamic characteristics of water-lubricated bearings

Shi

et al. 2023

Phys. Scr.

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In this paper, the effects of manufacturing error and micro-groove on the static, dynamic and stability characteristics of water-lubricated journal bearings (WLJBs) are investigated. Mathematical expressions of manufacturing errors and surface micro-groove are presented, and the Reynolds equations with steady and unsteady states are calculated by using the linear perturbative method and the finite difference technology. According to the developed model, the effects of the waviness magnitude, spatial number, and phase angle for circumferential errors, as well as the concavity, convexity, and taper for axial errors on the film thickness distribution, fluid pressure distribution, bearing capacity, coefficient of friction, side leakage flow rate, attitude angle, stiffness coefficient, damping coefficient, threshold speed and whirl frequency ratio of WLJBs are evaluated. Simulation results demonstrate that fluid film thickness distribution and fluid pressure distribution are significantly affected by manufacturing errors and micro-groove. Compared with axial manufacturing errors, circumferential manufacturing errors cause an inhomogeneous distribution of fluid pressure and morphological transformation in the high-pressure zone. The variation rules for the lubrication performance of bearings with circumferential waviness, concavity, convexity, and taper errors are not consistent at various eccentricity ratios. The magnitude of the concavity and taper errors may have an improving effect on the bearing performance, whereas circumferential waviness and convexity error play a negative role. Moreover, the micro-groove with partial distribution enhances the hydrodynamic effect in the bearing clearance. Numerical simulations can provide a valuable reference for the manufacturing and design of bearing systems.

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“…Various textures have been designed, such as triangles, 6–10 rectangles, 1,6,11 rhombuses, 7 squares, 12–16 semiellipsoids, 2,6,17 sphericals, 3,7,12,17–21 cylinders, 7,22,23 and composite textures. 12,24 They have been applied to hydrostatic journal bearings, 12 gas-foil thrust bearings, 1 slider bearings, 20,21 ship shaftless rim-driven thrusters, 6 three-cylinder ethanol engines, 18 engine crankshaft bearings, 2 and porous bearings.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the effect of texture on the steady-state characteristics of tilting pad journal bearings

Wei

Jiao

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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This work aims to study the effect of semi-ellipsoid texture on the bearing load capacity and maximum oil film temperature of tilting pad journal bearings. It has been shown that surface texture can improve the steady-state performance of bearings, but there are few studies on tilting pad journal bearings. A thermal elastohydrodynamic model of tilting pad journal bearings have been developed to support the analysis and solved by the finite difference method. The calculation results of the model are in good agreement with the simulation results of MADYN 2000 software, which proves the validity of the model. The effects of texture distribution, depth, radius, and density on the characteristics of tilting pad journal bearings were studied and compared with those of untextured tilting pad journal bearings. The results show that texture can significantly enhance or weaken the steady-state characteristics of tilting pad journal bearings, which is related to the texture parameters. This work provides a reference for the design of tilting pad journal bearings.

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Study on the tribo-dynamic performances of water-lubricated microgroove bearings during start-up

Cited by 45 publications

References 31 publications

Transient tribo-dynamic performance of journal bearings considering wear behavior during start-up

Transient tribo-dynamic performance of journal bearings considering wear behavior during start-up

Effects of manufacturing errors and micro-groove surfaces on the static and dynamic characteristics of water-lubricated bearings

Numerical analysis of the effect of texture on the steady-state characteristics of tilting pad journal bearings

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