Exploration on a Fast EHL Computing Technology for Analyzing Journal Bearings with Engineered Surface Textures

Chan, Chia Wen; Han, Yan; Wang, Zhanjiang; Wang, Jiaxu; Shi, Fanghui; Wang, Nenzi; Wang, Q. Jane

doi:10.1080/10402004.2013.863987

Cited by 25 publications

(19 citation statements)

References 25 publications

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“…In recent years, surface texturing technology has been successfully applied to many mechanical components, such as thrust bearings, journal bearings, and piston rings (Brizmer,et al (12); Wang, et al (13); Li and Wang (14); Chan, et al (15)). The friction reduction mechanisms of surface texturing are mainly ascribed to trapping wear debris, decreasing contact area, acting as reservoirs for lubricants, and generating hydrodynamic pressure.…”

Section: Introductionmentioning

confidence: 98%

Superlow Friction Behavior of Surface-Textured a-C:H Film in Water Environments

Song

et al. 2015

Tribology Transactions

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Textured a-C:H films with groove patterning were prepared and their tribological properties in distilled water were investigated. In addition, the effects of spatial periods on the tribological performance of the textured films were also discussed. The morphology and structure of textured a-C:H film as well as the worn surfaces were observed by scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results showed that textured films exhibited excellent tribological performance compared to the untextured film in a water environment. The groove patterning with the spatial period of 0.3 mm showed the most effective friction reduction property, and the friction coefficient and wear rate were 0.038 and 8 £ 10 ¡7 mm 3 /N¢m, respectively, which is attributed to lower internal stress of the textured film, as well as combined effects of trapping wear debris, hydrodynamic lubrication effect, reduced frictioninduced phase transformation, and less chemical reaction on the rubbed surface.

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Section: Introductionmentioning

confidence: 98%

Superlow Friction Behavior of Surface-Textured a-C:H Film in Water Environments

Song

et al. 2015

Tribology Transactions

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“…In 2014, Chan et al. 16 and Han et al. 17 developed a parallel computation procedure to study the mixed lubrication performance of the microgroove bearings.…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, the hydrodynamic pressure of the thrust bearing is yielded by the micro elastohydrodynamic effect due to the microgroove structure, which causes the difference in the coupled hydrodynamic pressure mechanism as compared to the studies presented by Wang et al [8][9][10] It has been demonstrated by numerical simulations and experiments that the textured/microgroove surface can facilitate in improving the lubrication performances for the conformal contact case. [11][12][13][14][15][16][17][18][19][20][21][22][23][24] In addition, the bottom shape of the microgroove plays a crucial role in affecting the hydrodynamic performance. [25][26][27] Recently, studies have been performed to further understand the influence mechanism of the microgroove with different bottom shapes.…”

Section: Introductionmentioning

confidence: 99%

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A hydrodynamic lubrication model and comparative analysis for coupled microgroove journal-thrust bearings lubricated with water

Xiang

Han

Chen

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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The novelty of this study is to develop a hydrodynamic lubrication numerical model for coupled microgroove journal-thrust bearings (or coupled bearings) under water-lubricated condition. In the present model, the continuity of the hydrodynamic pressure and the fluid field (or coupled hydrodynamic effect) at common boundary is considered to reveal the mutual effect between the hydrodynamic behavior of the journal bearing and the thrust bearing. The lubrication performances of the coupled microgroove bearing with three bottom shapes, i.e., isosceles triangle, right triangle, and left triangle, are studied comparatively. Additionally, the effects of the microgroove depth on the lubrication performances of the coupled bearing are discussed. The present study reveals that the coupled hydrodynamic effect generated by the coupled bearing can improve the lubrication performance for both the journal and the thrust bearing. The microgroove with left triangle bottom shape yields the optimal lubrication performance as compared to the other two. There is an optimal groove depth that generates the maximum load capacity and the minimum friction coefficient for both the journal and the thrust bearing.

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“…Lu et al [8] conducted a thermal-fluid coupling study on characteristics of air-oil two phase flow and heat transfer in a micro unmanned aerial vehicle (UAV) bearing chamber. Some researchers took the cavitation into account [9] and others developed an efficient numerical method [10].…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on Influence of Temperature on Lubricant Film Characteristics of the Piston/Cylinder Interface in Axial Piston Pumps

Song

Zeng

2018

Energies

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The loss of kinetic energy of moving parts due to viscous friction of lubricant causes the reduction of piston pump efficiency. The viscosity of lubricant film is mainly affected by the thermal effect. In order to improve energy efficiency of piston pump, this research presents a numerical method to analyze the lubricant film characteristics in axial piston pumps, considering the thermal effect by the coupled multi-disciplinary model, which includes the fluid flow field expressed by Reynolds equation, temperature field expressed by energy equation and heat transfer equation, kinematics expressed by the motion equation. The velocity and temperature distributions of the gap flow of piston/cylinder interface in steady state are firstly numerically computed. Then the distributions are validated by the experiment. Finally, by changing the thermal boundary condition, the influence of thermal effect on the lubricant film, the eccentricity and the contact time between the piston and cylinder are analyzed. Results show that with the increase of temperature, the contact time increases in the form of a hyperbolic tangent function, which will reduce the efficiency of the axial piston pump. There is a critical temperature beyond which the contact time will increase rapidly, thus this temperature is the considered as a key point for the temperature design.

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Exploration on a Fast EHL Computing Technology for Analyzing Journal Bearings with Engineered Surface Textures

Cited by 25 publications

References 25 publications

Superlow Friction Behavior of Surface-Textured a-C:H Film in Water Environments

Superlow Friction Behavior of Surface-Textured a-C:H Film in Water Environments

A hydrodynamic lubrication model and comparative analysis for coupled microgroove journal-thrust bearings lubricated with water

A Numerical Study on Influence of Temperature on Lubricant Film Characteristics of the Piston/Cylinder Interface in Axial Piston Pumps

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