Effect of surface roughness on static and dynamic characteristics of MHD couple stress lubrication of parabolic slider bearing

Naduvinamani, N. B.; Siddangouda, A.; Patil, Siddharam

doi:10.1080/17515831.2017.1339485

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…For mixed lubrication, the total friction are consisted of two components (Naduvinamani et al , 2017): lubricant friction f oil , frc and asperity friction f asp , frc . The lubricant friction f oil , frc can be given as (Zheng et al , 2020a): …”

Section: Mathematical Modelmentioning

confidence: 99%

A study on diesel engine crankshaft bearing failure analysis with consideration of bearing lubrication

Liu¹,

Huo²,

Liu³

et al. 2022

ILT

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Purpose The edge of diesel engine crankshaft main bearing is more likely to fail in its real working condition. This paper aims to study the bearing failure mechanism by finding the relationship between bearing lubrication characteristics and its working condition. Design/methodology/approach This work builds the mixed lubrication model of crankshaft bearing to analyze the cause of bearing abnormal wear, and the finite difference method was used to solving the average Reynolds equation. During the analysis, journal misaligned angle, external load and roughness are considered. Findings The result shows that the wear of the diesel engine crankshaft bearing happens in engine startup phase and the bottom of the bearing are more prone to be excessively worn. Under the influence of journal misalignment, bearing asperity contact load and speed range of mixed lubrication will increase markedly. The edge of the bearing will be excessively worn. The effect of misalignment on bearing lubrication performance varies under different shaft rotation speed. Originality/value The former research studies on crankshaft bearing either just focused on its lubrication characteristics or interested in its failure types (wear, adhere, cavitation). This paper studies the relationship between bearing failure mechanism and lubrication performance.

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Section: Mathematical Modelmentioning

confidence: 99%

A study on diesel engine crankshaft bearing failure analysis with consideration of bearing lubrication

Liu¹,

Huo²,

Liu³

et al. 2022

ILT

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show abstract

“…Moreover, the couple stress parameter decreased obviously as the viscosity-pressure effect was considered. Based on Christensen stochastic theory, Nabhani M, 26 Naduvinamani 27 and Hanumagowda 28 derived the Reynolds equation of stochastic MHD couple stress. Transverse roughness supported larger dynamic stiffness, carrying capacity, and damping coefficients than smooth surfaces, while longitudinal roughness had the opposite effects.…”

Section: Introductionmentioning

confidence: 99%

Theoretical research of couple stress effect and surface roughness on lubrication regimes transition of misaligned hydrodynamic journal

Zheng

Zhu

Fan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The purpose of this paper was to investigate the combined effects of couple stress and surface roughness on lubrication performance and regime transition of misaligned hydrodynamic journals. New lubrication models considering misalignment angle, couple stress, and surface roughness were established. Under the multi-coupled factors, Stribeck curves were exploited to reveal the lubrication regimes of journals. Following Greenwood’s aspect contact theory, force relational equations among external load, asperity support capacity, and oil film bearing capacity have been further discussed. Results showed that the growth of the minimum film thickness, the maximum film pressure, and friction coefficient versus couple stress parameters trended to be opposite to those versus misalignment angle. The speed of the lubrication regime transition and the minimum friction coefficient increased with the enlargement of the misalignment angle but decreased as the couple stress parameter increased. Higher couple stress parameters resulted in an increment of the safety speed of the journal and were conducive to maintaining the hydrodynamic lubrication regime of the misaligned bearing at low speed, which is applicable to such misaligned journal bearings in practical engineering.

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Stochastic models for turbulent lubrication of bearing with rough surfaces

Zhu

Sun

et al. 2019

Tribology International

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Effect of surface roughness on static and dynamic characteristics of MHD couple stress lubrication of parabolic slider bearing

Cited by 4 publications

References 20 publications

A study on diesel engine crankshaft bearing failure analysis with consideration of bearing lubrication

A study on diesel engine crankshaft bearing failure analysis with consideration of bearing lubrication

Theoretical research of couple stress effect and surface roughness on lubrication regimes transition of misaligned hydrodynamic journal

Stochastic models for turbulent lubrication of bearing with rough surfaces

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