Investigations of the static and dynamic characteristics of water-lubricated hydrodynamic journal bearing considering turbulent, thermohydrodynamic and misaligned effects

Feng, Huihui; Jiang, Shuyun; Ji, Aimin

doi:10.1016/j.triboint.2018.09.007

Cited by 113 publications

(52 citation statements)

References 19 publications

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“…Wu et al (2018) experimentally studied dynamic performances of water-lubricated rubber bearings under mixed lubrication. Feng et al (2019) numerically investigated the dynamic coefficients of waterlubricated bearing considering the journal misalignment. Shi et al studied the dynamic coefficients of the water-lubricated rubber bearing under a hydrodynamic lubrication regime.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the dynamic characteristics of water-lubricated rubber bearing under asperity contact

Xiang

Wang

et al. 2021

ILT

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Purpose In this study, the dynamic characteristics of the water-lubricated rubber bearing considering asperity contact are numerically studied, including water-film stiffness and damping coefficients and plastic-elastic contact stiffness coefficient. Design/methodology/approach The Kogut-Etsion elastic-plastic contact model is applied to calculate the contact stiffness coefficient at the bearing-bush interface and the perturbed method is used to calculate the stiffness and damping coefficients of water-film. In addition, the rubber deformation is determined by the finite element method (FEM) during the simulation. Parametric studies are conducted to assess the effects of the radial clearance, rubber thickness and elastic modulus on the dynamic characteristic of water-lubricated rubber bearing. Findings Numerical results indicate that stiffness and damping coefficients of water film and the contact stiffness of asperity are increased with the decreasing of the radial clearance and the dynamic coefficients are less sensitive to the rubber thickness compared with the elastic modulus of rubber. Furthermore, due to the existed groove, a sudden change of the water film direct stiffness and damping coefficients is observed when the eccentricity ratio ranges from 0.6 to 1.0. Originality/value It is expected this study can provide more information to establish a dynamic equation of water-lubricated rubber bearings exposed to mixed lubrication conditions.

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Section: Introductionmentioning

confidence: 99%

Numerical study on the dynamic characteristics of water-lubricated rubber bearing under asperity contact

Xiang

Wang

et al. 2021

ILT

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“…Research shows that roughness increases the effect of misalignment. Feng et al [25] evaluated the static and dynamic characteristics of waterlubricated bearings, taking into account turbulent and misalignment effects. The results show that turbulence improves load capacity.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment

2021

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In the present work, a numerical model is developed to investigate the influence of wear and misalignment on the bearings of a stationary diesel engine. The model implemented considers the effects of surface wear on the bearing, cavitation effects, and surface roughness. For the numerical analysis, changes in the surface roughness of , , and are defined, and changes in the bearing load of 50%, 75%, and 100%. The results demonstrated that increasing the surface roughness intensifies the bearing wear, which represents 18% and 140% of the bearing clearance for the roughness of and , respectively. Additionally, the surface roughness causes a considerable increase in the bearing wear rate. The results described a maximum wear rate of . In general, increasing the bearing load by 25% doubles the hydrodynamic pressure conditions increases friction force by 33%, and reduces lubrication film thickness by 12%. The analysis of the angle of deflection, and , shows that the moment and the degree of misalignment tend to increase significantly with the increase in the magnitude of the angle . Negative angles of deflection, , produce a greater increase in the degree of misalignment and the moment. This implies a greater chance of contact with the bearing surface. In conclusion, the proposed methodology serves as a reliable tool to simultaneously evaluate key parameters on the tribological behavior of bearings that further extend their endurance and minimize wear damage.

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“…Water-lubricated hydrodynamic bearings have attracted increasing attention for their lower frictional power loss, low temperature rise and environmental protection (Feng et al, 2019). However, further research is still needed to improve their loading capacity because of the lower viscosity compared with oil (Li et al, 2019a(Li et al, , 2019b.…”

Section: Introductionmentioning

confidence: 99%

“…Armentrout et al (2017) analyzed the effect of turbulence on water-lubricated journal bearing and found that turbulence accounted for around 50% of the load capacity in their cases. Feng et al, (2019) compared the static characteristics of waterlubricated bearings with and without considering turbulence, and concluded that the turbulence promoted loading capacity of bearings. Their research also agreed with the conclusion from Dousti et al (2012).…”

Section: Introductionmentioning

confidence: 99%

Analysis of turbulence and blocking effects on loading capacity for elementary texture cells of infinite width under water lubrication

Wang

Zhang

et al. 2020

ILT

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Purpose The loading mechanism of textures considering turbulence has not been fully covered. This paper aims to investigate the effect of turbulence on the textured loading capacity under water lubrication and to analyze the causes of the turbulence effect. Design/methodology/approach Computational fluid dynamic models with different textured shapes are established after validation. The transition shear stress transport (SST) model, which is suitable for predicting the transition process of fluid from laminar state to turbulent state, is adopted in the present study. To illustrate the effect of turbulence, the loading capacity of textures predicted by transition SST model and laminar model is compared. Findings The loading capacity is higher after considering turbulence because more lubricant enters into textures and the flow rate of lubricant to textured outlet increases. There exists an optimal textured depth ratio and density for loading capacity and the change of flow state would not affect the optimal values. The degree of fluid blockage at textured outlet has a dominant influence on loading capacity. As the textured shape changes to triangle or ellipse from rectangle, the vortices at the textured bottom move forward and the blockage at a textured outlet is enhanced, which makes loading capacity improved under the action of blocking effect. Originality/value The enhancement of the blocking effect is found to be crucial to the improvement of textured loading capacity after considering turbulence. Present research provides references to understand the loading mechanism of textures under turbulent conditions. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0149/

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Investigations of the static and dynamic characteristics of water-lubricated hydrodynamic journal bearing considering turbulent, thermohydrodynamic and misaligned effects

Cited by 113 publications

References 19 publications

Numerical study on the dynamic characteristics of water-lubricated rubber bearing under asperity contact

Numerical study on the dynamic characteristics of water-lubricated rubber bearing under asperity contact

A Numerical Model for the Analysis of the Bearings of a Diesel Engine Subjected to Conditions of Wear and Misalignment

Analysis of turbulence and blocking effects on loading capacity for elementary texture cells of infinite width under water lubrication

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