Determination of friction coefficient for water-lubricated journal bearing considering rough surface EHL contacts

Prajapati, Deepak K.; Katiyar, Jitendra Kumar; Prakash, Chander

doi:10.1007/s12008-023-01466-7

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…The finite difference method [34][35][36][37] is used to solve the Reynolds Equation ( 7) by dividing m mesh cell along the axial direction (λ direction) of the bearing and n mesh cell along the circumferential direction (τ direction) of the bearing; the mesh division is shown in Figure 2.…”

Section: Mathematical Modelmentioning

confidence: 99%

Effect of Groove Structure on Lubrication Performance of Water-Lubricated Stern Tube Bearings

Zhang

2023

Lubricants

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This study investigated the lubrication characteristics (i.e., the groove ratio and width) of water-lubricated stern tube bearings, based on the flexibility matrix method and lubrication theory. Considering the elastic deformation of the lining, a fluid structure interaction (FSI) model of the surface micro-groove texture of a water-lubricated stern tube bearing was established, and the correctness and rationality of the model were verified by experiments. Micro-grooved, surface-lubricated, water-lubricated stern tube bearings with three different cross-sectional shapes (rectangular, circular, and triangular) were designed. The influences of the groove area ratio and width on the bearing load-carrying capacity and friction coefficient were analyzed. At a groove area ratio of 0.31, the load-carrying capacity of the rectangular grooved stern tube bearing reached the maximum value and the friction coefficient reached the minimum value. It is recommended to design and use water-lubricated stern tube bearings, especially Thordon water-lubricated stern tube bearings, with rectangular micro-grooves, with a groove area ratio of 0.30–0.32, so that the best lubrication performance can be obtained. With the increase in the micro-groove width, the lubrication of water-lubricated stern tube bearings with partial rectangular micro-grooves is significantly better than that of others. Under the same conditions, the bearing load-carrying capacity and friction performance of local groove stern bearings is significantly better than that of global groove stern bearings.

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Section: Mathematical Modelmentioning

confidence: 99%

Effect of Groove Structure on Lubrication Performance of Water-Lubricated Stern Tube Bearings

Zhang

2023

Lubricants

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“…They found that a surface with more negative skewness shows lower total engine frictional force near the vicinity of dead centers. Recently, non-Gaussian flow factors were considered to study the tribological properties of water-lubricated journal bearings [35].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Non-Gaussian Roughness and Spectral Properties on Mixed Lubrication for Heavily Loaded Counterformal Contacts

Prajapati,

Björling

2024

Lubricants

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The impact of non-Gaussian height distribution and spectral properties on the lubrication performance of counterformal (point) contacts is quantitatively studied (film parameter, Λ, and asperity load ratio, La) by developing a mixed lubrication model. The Weibull height distribution function and power spectral density (PSD) are used to generate artificial surface topographies (non-Gaussian and Gaussian, isotropic), as these surface topographies are found in many tribological components. The set of variables needed to parametrize and their effect on mixed lubrication is discussed, including the shape parameter, the autocorrelation length, the wavelength ratio, and the Hurst coefficient. It is revealed that a rough surface with a lower shape parameter exhibits higher hydrodynamic lift. The spectral properties (the autocorrelation length and the wavelength ratio) of rough surfaces significantly affect the film parameter and the hydrodynamic and asperity pressures. The film parameter is slightly influenced by the Hurst coefficient.

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Effect of raceway surface topography based on solid lubrication on temperature rise characteristics of HIPSN full ceramic ball bearings

Li,

Huang,

Wei

et al. 2024

ILT

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Purpose This study aims to understand the influence of raceway surface topography on the temperature rise characteristics of silicon nitride (Si3N4) full ceramic ball bearing and improve its service life. Design/methodology/approach The arithmetic average height Sa, skewness Ssk and kurtosis Sku in the three-dimensional surface roughness parameters are used to quantitatively characterize the surface topography of the raceway after superfinishing. The bearing life testing machine is used to test the Si3N4 full ceramic ball bearing using polytetrafluoroethylene (PTFE) cage under dry friction conditions, and the self-lubricating full ceramic ball bearing heat generation model is established. Findings With the decrease of Sa and Ssk on the raceway surface and the increase of Sku, the average height of the raceway surface decreases, and the peaks and valleys tend to be symmetrically distributed on the average surface, and the surface texture becomes tighter. This kind of raceway surface topography is beneficial to form a thin and uniform filamentous PTFE transfer film with a wide coverage area on the raceway surface based on consuming less cage materials and improving the temperature rise characteristics of hot isostatic pressing silicon nitride full ceramic ball bearings. Originality/value The research results provide a theoretical basis for the reasonable selection of Si3N4 ring raceway processing technology and have important significance for improving the working characteristics and service life of Si3N4 full ceramic ball bearings under dry friction conditions.

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Determination of friction coefficient for water-lubricated journal bearing considering rough surface EHL contacts

Cited by 4 publications

References 18 publications

Effect of Groove Structure on Lubrication Performance of Water-Lubricated Stern Tube Bearings

Effect of Groove Structure on Lubrication Performance of Water-Lubricated Stern Tube Bearings

The Influence of Non-Gaussian Roughness and Spectral Properties on Mixed Lubrication for Heavily Loaded Counterformal Contacts

Effect of raceway surface topography based on solid lubrication on temperature rise characteristics of HIPSN full ceramic ball bearings

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