Theoretical and experimental investigation on local turbulence effect on mixed-lubrication journal bearing during speeding up

Lv, Fangrui; Zhang, Xinjie; Ji, Cuicui; Rao, Zhushi

doi:10.1063/5.0122039

Cited by 16 publications

(6 citation statements)

References 36 publications

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“…However, the second-order central scheme (2C) cannot accurately predict the pressure variation. Liu, Wang et al have well explained why different discretization schemes give different pressure [2]. A sharp increase in the pressure is observed before the solid obstacle at which point the conversion of flowing fluid kinetic energy changes into pressure energy.…”

Section: Relaxationmentioning

confidence: 99%

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Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

Patel¹,

Khan²,

Bakolas³

et al. 2023

Preprint

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Solid asperity interactions are common and inevitable under severe loading conditions for any lubricated contact. Heavy-duty machine components (gear, bearings etc.) generally operate under Mixed Lubrication, where uneven surface features contact each other when generated fluid pressure is not enough to support the external load. The Reynolds equation is commonly used to simulate smooth lubricated contacts numerically. In rough lubricated interfaces where opposite surface asperities make contact, the Reynolds equation alone cannot accurately predict pressure using the traditional numerical simulation method. In this paper, Lubrication-Contact interface conditions (LCICs) have been implemented and extended to solve the multiple asperity contact problem using the full-multigrid approach. The developed novel algorithm has significantly accelerated the solution process and improved the accuracy and efficiency of pressure calculation for fluid-solid sub-interactions that can occur under ML regions. The Finite Difference Method (FDM) results have been compared with Computational Fluid Dynamics (CFD) simulation to validate the newly developed model. Hence, the proposed optimized solution method will provide valuable insight to researchers and industry engineers interested in simulating the ML problem where the effect of the fluid-solid interface can be captured effectively to improve reliability in the calculation of the life expectancy of the lubricated parts.

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Section: Relaxationmentioning

confidence: 99%

“…Several studies are reported in the literature focusing on surface roughness effects on the functionality and lifespan of lubricated contact, and this topic is currently a priority for tribology industries [1][2][3][4]. A thorough assessment of the history of numerical simulation of the ML is well documented in the literature [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

Patel¹,

Khan²,

Bakolas³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In wedge terms, H (film thickness) can be defined analytically. Equation (2) shows the dimensionless film thickness used for the converging simple wedge geometry.…”

Section: Fdm Modelmentioning

confidence: 99%

“…Several studies are reported in the literature focusing on surface roughness effects on the functionality and lifespan of lubricated contact, and this topic is currently a priority in tribology industries [1][2][3][4]. A thorough assessment of the history of numerical simulation of the ML is well documented in the literature [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

et al. 2023

View full text Add to dashboard Cite

Solid asperity interactions are common and inevitable under severe loading conditions for any lubricated contact. Heavy-duty machine components (gears, bearings, etc.) generally operate under Mixed Lubrication (ML), where uneven surface features contact each other when the generated fluid pressure is not enough to support the external load. The Reynolds equation is commonly used to simulate smooth lubricated contacts numerically. In rough lubricated interfaces where opposite surface asperities make contact, the Reynolds equation alone cannot accurately predict pressure using the traditional numerical simulation method. In this paper, lubrication–contact interface conditions (LCICs) have been implemented and extended to solve the multiple asperity contact problem using the full-multigrid approach. The developed novel algorithm has significantly accelerated the solution process and improved the accuracy and efficiency of pressure calculation for fluid–solid sub-interactions that can occur in ML regions. The results of the finite difference method (FDM) results have been compared with those of computational fluid dynamics (CFD) simulation to validate the newly developed model. Hence, the proposed optimized solution method will provide valuable insight to researchers and industry engineers interested in simulating the ML problem where the effect of the fluid–solid interface can be captured effectively to improve reliability in the calculation of the life expectancy of the lubricated parts.

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“…Xiang et al [6][7][8] proposed a profile modification method of bearing surfaces to optimize the wear of WLJBs and evaluated the nonlinear dynamic performance for WLJBs considering mixed the thermos-elasto-hydrodynamic effect. Lv et al [9,10] developed the transient mixed-lubrication model that considers turbulence to analyze the performance characteristics of WLJBs with the impact load and speeding up. In the above studies on the static and dynamic characteristics of WLJBs, the bearings are usually assumed to have an ideal cylindrical shape.…”

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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Theoretical and experimental investigation on local turbulence effect on mixed-lubrication journal bearing during speeding up

Cited by 16 publications

References 36 publications

Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

Numerical Simulation of the Lubricant-Solid Interface Using the Multigrid Method

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

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