表面织构动压滑动轴承界面滑移研究
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摘要
利用力学平衡方程与流体力学方程并结合楔形模型,建立无界面滑移、单边界面滑移以及双边界面滑移状态下的力学模型,采用有限元方法对表面织构分布位置及不同界面滑移对滑移速度与摩擦力的作用规律进行研究。研究表明:油膜发生界面滑移时,在升压区和降压区油膜滑移速度分别表现为非线性的凹形和凸形变化规律;油膜在上表面和下表面发生滑移时,最大剪切力分别发生在油膜上表面和下表面;而上、下表面均发生界面滑移时,油膜最大剪切应力发生在上、下表面,且二者最大剪切应力数值相同,此时摩擦力显著减小且仅为无滑移时的4%～17%;相比表面织构布置在入口与中部位置的模型,表面织构在出口处的模型呈现出优异的承载和减摩效果。表面织构轴承界面滑移产生的机制主要是润滑油具有牛顿流体的黏滞特性。
The mechanical models of no interface slip,single interface slip and double interface slip were established by using mechanical equilibrium equation and hydrodynamic equation combined with wedge model.The effects of the surface textured distribution and different interface slip on the sliding velocity and friction force were studied by finite element method.The results show that when the interface slip occurs,the slip velocities of oil film in boost region and decompression region show nonlinear concave and convex variation laws,respectively.When the interface slip occurs on the upper surface and the lower surface of oil film,the maximum shear stress occurs on the upper surface and the lower surface respectively.When the interface slip occurs on both upper and lower surfaces,the maximum shear stress of oil film occurs on both upper and lower surfaces,and the values of the maximum shear stress are the same,while the friction force is significantly reduced by 4%～17% compared with the friction force of no interface slip.The model with surface texture distributed at the exit exhibits excellent effect of load bearing and friction reducing compared with the models with surface texture distributed the atentrance and the middle.The mechanism of interfacial slip of surface texture hydrodynamic journal bearing is that the lubricating oil has viscous property of Newtonian fluid.
The mechanical models of no interface slip,single interface slip and double interface slip were established by using mechanical equilibrium equation and hydrodynamic equation combined with wedge model.The effects of the surface textured distribution and different interface slip on the sliding velocity and friction force were studied by finite element method.The results show that when the interface slip occurs,the slip velocities of oil film in boost region and decompression region show nonlinear concave and convex variation laws,respectively.When the interface slip occurs on the upper surface and the lower surface of oil film,the maximum shear stress occurs on the upper surface and the lower surface respectively.When the interface slip occurs on both upper and lower surfaces,the maximum shear stress of oil film occurs on both upper and lower surfaces,and the values of the maximum shear stress are the same,while the friction force is significantly reduced by 4%～17% compared with the friction force of no interface slip.The model with surface texture distributed at the exit exhibits excellent effect of load bearing and friction reducing compared with the models with surface texture distributed the atentrance and the middle.The mechanism of interfacial slip of surface texture hydrodynamic journal bearing is that the lubricating oil has viscous property of Newtonian fluid.
引文
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[14]毛亚洲,杨建玺,刘永刚.织构分布对动压滑动轴承油膜压力的影响[J].润滑与密封,2018,43(6):55-60.MAO Y Z,YANG J X,LIU Y G.Analysis of influence of oil film pressure distribution of textured hydrodynamic sliding bearing[J].Lubrication Engineering,2018,43(6):55-60.
[15]TALA-IGHIL N,FILLON M,MASPEYROT P.Effect of textured area on the performances of a hydrodynamiac journal beering[J].Tribology International,2011,44(3):211-219.
[16]TALA-IGHIL N,FILLON M.A numerical investigation of both thermal and texturing surface effects on the journal bearings static characteristics[J].Tribology International,2015,90:228-239.
[2]ZHU Y X,GRAUICK S.Rate-dependent slip of Newtonian liquid at smooth surfaces[J].Physical Review Letters,2001,87:096105.
[3]CHOJ H J,LAWB M,RIEUTORD F.Dipole-dependent slip of Newtonian liquids at smooth solid hydrophobic surfaces[J].Physical Review Letters,2004,92(16):166102-1-4.
[4]陈晖,沈明.基于复合滑移的微纳缝隙剪切流研究[J].华南理工大学学报(自然科学版),2014,42(7):68-73.CHEN H,SHEN M.Investigation into shear flow in micro/nano gap based on complicated boundary slip[J].Journal of South China University of Technology(Natural Science Edition),2014,42(7):68-73.
[5]OU J,PEROT B,ROTHSTEIN J P.Laminar drag reduction in microchannels using ultrahydrophobic surfaces[J].Physics of Fluids,2004,16(13):4635-4643.
[6]高诚辉,杜华,王巍琦,等.液体润滑剂的黏度对边界滑移影响的实验研究[J].中国机械工程,2015,26(12):1635-1638.GAO C H,DU H,WANG W Q,et al.Experiment research on boundary slip affectted by liquid viscosity[J].China Mechanical Engineering,2015,26(12):1635-1638.
[7]SPIKES H A.The half-wetting bearing.Part 1:extended Reynolds equation[J].Proceeding of the Institution of Mechanical Engineers.Part J:Journal of Engineering Tribology,2003,217(1):1-14.
[8]SPIKES H A.The half-wetting bearing.Part 2:potential application in low load contacts[J].Proceeding of the Institution of Mechanical Engineers.Part J:Journal of Engineering Tribology,2003,217(1):15-26.
[9]IBATAN T,UDDIN M S,CHOWDHURY M A K.Recent development on surface texturing in enhancing tribological performance of bearing sliders[J].Surface&Coatings Technology,2015,272:102-120.
[10]COBLAS D G,FATU A,MAOUI A,et al.Manufacturing textured surfaces:state of art and recent developments[J].ARCHIVE Proceedings of the Institution of Mechanical Engineers.Part J:Journal of Engineering Tribology,2014,229(1):1994-1996.
[11]SUDEEP U,TANDON N,PANDEY R K.Performance of lubricated rolling/sliding concentrated contacts with surface textures:a review[J].Journal of Tribology,2015,137(3):031501-1-11.
[12]HAMILTON D B,WAJOWIT J A,ALLEN C M.A theory of lubrication by micro-irregularities[J].Journal of Basic Engjneering,1966,88(1):177-185.
[13]ETSION I.Improving tribological performance of mechanical components by laser surface texturing[J].Tribology Letters,2004,17:733-737.
[14]毛亚洲,杨建玺,刘永刚.织构分布对动压滑动轴承油膜压力的影响[J].润滑与密封,2018,43(6):55-60.MAO Y Z,YANG J X,LIU Y G.Analysis of influence of oil film pressure distribution of textured hydrodynamic sliding bearing[J].Lubrication Engineering,2018,43(6):55-60.
[15]TALA-IGHIL N,FILLON M,MASPEYROT P.Effect of textured area on the performances of a hydrodynamiac journal beering[J].Tribology International,2011,44(3):211-219.
[16]TALA-IGHIL N,FILLON M.A numerical investigation of both thermal and texturing surface effects on the journal bearings static characteristics[J].Tribology International,2015,90:228-239.