微沟槽形貌对水润滑轴承混合润滑特性影响的研究
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摘要
建立了计入轴承内表面微沟槽形貌的水润滑轴承混合润滑(Mixed-EHDL)数值计算模型,着重研究了不同运行工况下,半椭圆形、矩形、等腰三角形、左三角形、右三角形等多种微沟槽形貌对水润滑轴承混合润滑特性的影响.研究表明:在所有微沟槽形貌中,混合润滑性能与承载性能优劣排序依次为右三角形、等腰三角形、左三角形、半椭圆形、矩形;在弹流润滑阶段,微沟槽形貌对水润滑轴承摩擦系数几乎无影响,而在混合润滑阶段,不同微沟槽形貌下接触载荷以及摩擦系数之间的差异随转速的增加呈现出先增大后减小最后趋于统一的规律性;在承载区,由于沟槽内水膜增压能力以及抽吸作用的不同引起了水润滑轴承混合润滑性能的差异,其中右三角形表现最优,而矩形最差.
A mixed elastohydrodynamic lubrication(mixed-EHDL)numerical model was established considering the microgroove bottom shapes of water lubricated journal bearings.The effects of different microgroove bottom shapes including semi-ellipse,rectangle,isosceles triangle,left triangle and right triangle on the mixed lubrication performance of water lubricated journal bearings were studied.The result showed that the ability to improve the mixed lubrication performance and load capacity can be ranked in the sequence of right triangle,isosceles triangle,left triangle,semi-ellipse,and rectangle.In the elastohydrodynamic lubrication stage,the microgroove bottom shapes had little influence on the friction coefficient of the water lubricated journal bearings,while in the mixed lubrication stage,with the increase of rotation speed,the effects of microgroove bottom shapes on the contact load and friction coefficient presented a regularity that it increased first,then decreased and finally tended to be uniform.In the bearing area,the right triangle bottom shapes involved a micro-step bearing effect which can significantly improve the lubrication performance,comparing to semi-ellipse,isosceles triangle,left triangle and rectangle bottom shapes.
A mixed elastohydrodynamic lubrication(mixed-EHDL)numerical model was established considering the microgroove bottom shapes of water lubricated journal bearings.The effects of different microgroove bottom shapes including semi-ellipse,rectangle,isosceles triangle,left triangle and right triangle on the mixed lubrication performance of water lubricated journal bearings were studied.The result showed that the ability to improve the mixed lubrication performance and load capacity can be ranked in the sequence of right triangle,isosceles triangle,left triangle,semi-ellipse,and rectangle.In the elastohydrodynamic lubrication stage,the microgroove bottom shapes had little influence on the friction coefficient of the water lubricated journal bearings,while in the mixed lubrication stage,with the increase of rotation speed,the effects of microgroove bottom shapes on the contact load and friction coefficient presented a regularity that it increased first,then decreased and finally tended to be uniform.In the bearing area,the right triangle bottom shapes involved a micro-step bearing effect which can significantly improve the lubrication performance,comparing to semi-ellipse,isosceles triangle,left triangle and rectangle bottom shapes.
引文
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[16]WANG Y,ZHANG C,WANG Q J,et al.A mixed-TEHD analysis and experiment of journal bearings under severe operating conditions[J].Tribology International,2002,35(6):395-407.
[17]LEE S,REN N.Behavior of elastic-plastic rough surface contacts as affected by surface topography,load,and material hardness[J].ASLE Transactions,1996,39(1):67-74.
[18]JANG G H,CHANG D I.Analysis of a hydrodynamic herringbone grooved journal bearing considering cavitation[J].Journal of Tribology,2000,122(1):103-109.
[2] PAI R S,PAIR R.Stability of four-axial and six-axial grooved water-lubricated journal bearings under dynamic load[J].Proceedings of the Institution of Mechanical Engineers,Part J:Journal of Engineering Tribology,2008,222(5):683-691.
[3]王家序,邱茜,周广武,等.水润滑轴承振动噪声分析及实验研究[J].湖南大学学报(自然科学版),2015,42(8):53-58.WANG J X,QIU Q,ZHOU G W,et al.Simulative and experimental research on vibrational noise produced by water-lubricated bearings[J].Journal of Hunan University(Natural Sciences),2015,42(8):53-58.(In Chinese)
[4]王楠,孟庆丰,王朋朋,等.水润滑橡胶轴承特性仿真与试验研究[J].机械工程学报,2014,50(13):113-121.WANG N,MENG Q F,WANG P P,et al.Simulation and experimental research on properties of water-lubricated rubber bearing[J].Journal of Mechanical Engineering,2014,50(13):113-121.(In Chinese)
[5]周广武,王家序,李俊阳,等.螺旋槽水润滑橡胶合金轴承摩擦学性能实验[J].重庆大学学报(自然科学版),2013,36(3):1-5.ZHOU G W,WANG J X,LI J Y,et al.Experimental investigation of tribological properties for spiral groove water lubricated rubber bearings[J].Journal of Chongqing University(Natural Sciences),2013,36(3):1-5.(In Chinese)
[6]梁强.船用水润滑轴承数值计算及结构优化[D].武汉:武汉理工大学,2009.LINANG Q.Numerical calculation and structure optimize of marine water-lubricated bearing[D].Wuhan:Wuhan University of Technology,2009.(In Chinese)
[7] NANBU T,REN N,YASUDA Y,et al.Micro-textures in concentrated conformal-contact lubrication:effects of texture bottom shape and surface relative motion[J].Tribology Letters,2008,29(3):241-252.
[8] REN N,NANBU T,YASUDA Y,et al.Micro textures in concentrated-conformal-contact lubrication:effect of distribution patterns[J].Tribology Letters,2007,28(3):275-285.
[9] QIU M,DELIC A,RAEYMAEKERS B.The effect of texture shape on the load-carrying capacity of gas-lubricated parallel slider bearings[J].Tribology Letters,2012,48(3):315-327.
[10]QIU M,MINSON B R,RAEYMAEKERS B.The effect of texture shape on the friction coefficient and stiffness of gas-lubricated parallel slider bearings[J].Tribology International,2013,67(4):278-288.
[11]尹明虎,陈国定,高当成,等.3种微织构对径向滑动轴承性能的影响[J].哈尔滨工业大学学报,2016,48(1):159-164.YIN Ming-hu,CHEN Guo-ding,GAO Dang-cheng,et al.Effects of three types of surface texture on the performances of journal bearing[J].Journal of Harbin Institute of Technology,2016,48(1):159-164.(In Chinese)
[12]尹明虎,陈国定,高当成,等.微织构对径向滑动轴承承载能力的影响机理[J].华中科技大学学报(自然科学版),2015,43(12):27-31.YIN Ming-hu,CHEN Guo-ding,GAO Dang-cheng,et al.Influence mechanism of micro texture on load carrying capacity of journal bearing[J].J Huazhong Univ of Sci&Tech(Natural Science Edition),2015,43(12):27-31.(In Chinese)
[13]PATIR N,CHENG H S.Effect of surface roughness orientation on the central film thickness in EHD contacts[C]∥Proceedings of the Fifth Leeds-Lyon Symposium on Triology.Bury St.Edmunds,UK,1979:15-21.
[14]SHI F,WANG Q.A mixed-TEHD model for journal-bearing conformal contacts-Part I:model formulation and approximation of heat transfer considering asperity contact[J].Journal of Tribology,1998,120(2):198.
[15]PEKLENIK J.New developments in surface characterization and measurements by means of random process analysis[J].Proc Insts Mech Engrs,1967,182(3K):108-126.
[16]WANG Y,ZHANG C,WANG Q J,et al.A mixed-TEHD analysis and experiment of journal bearings under severe operating conditions[J].Tribology International,2002,35(6):395-407.
[17]LEE S,REN N.Behavior of elastic-plastic rough surface contacts as affected by surface topography,load,and material hardness[J].ASLE Transactions,1996,39(1):67-74.
[18]JANG G H,CHANG D I.Analysis of a hydrodynamic herringbone grooved journal bearing considering cavitation[J].Journal of Tribology,2000,122(1):103-109.
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