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Investigation of tribological properties of MoS2 and CaF2 particles as oil additives and their effects on surface contact 研究作为油添加剂的 MoS2 和 CaF2 颗粒的摩擦学特性及其对表面接触的影响
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-25 DOI: 10.1002/ls.1695
Hasan Baş, Muhammet Ali Beşirbeyoğlu, Onur Özen
{"title":"Investigation of tribological properties of MoS2 and CaF2 particles as oil additives and their effects on surface contact","authors":"Hasan Baş,&nbsp;Muhammet Ali Beşirbeyoğlu,&nbsp;Onur Özen","doi":"10.1002/ls.1695","DOIUrl":"10.1002/ls.1695","url":null,"abstract":"<p>Nowadays, researches on the use of alkali metal salts as friction-reducing and anti-wear oil additives are continuing. In this study, the tribological effects of heavy metal containing MoS<sub>2</sub> and alkali metal salt CaF<sub>2</sub> additives on pure engine oil (20W50) were investigated using block-on-ring tester configured as surface contact geometry. The tests were performed at various contact loads, revolutions, and additive ratios. The crystal structure of the additives and their effects on surface quality and surface roughness analysed by x-ray crystallography, scanning electron microscope and profilometry. Moreover, Energy dispersive spectrometry was used for element detection on worn surfaces. Results indicated that additives of MoS<sub>2</sub> and CaF<sub>2</sub> can reduce the friction, increase the capacity of load-carrying and the wear resistance of surfaces. The additives improved the operation of the base oil in boundary lubrication zone by increasing the tribofilm forming effect. It was observed that the CaF<sub>2</sub> additive exhibited more stable friction behaviour, while the MoS<sub>2</sub> additive has better protective effects against scratches on the block surface.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 4","pages":"314-329"},"PeriodicalIF":1.9,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of cutting and feed speed on lubrication performance of large hydrostatic turntable with constant linear velocity 切削速度和进给速度对恒定线速度大型静压转台润滑性能的影响
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-25 DOI: 10.1002/ls.1694
Zhang Yanqin, Zhao Rong, Tao Jianting, Wang Mulan, Kong Pengrui
{"title":"Effect of cutting and feed speed on lubrication performance of large hydrostatic turntable with constant linear velocity","authors":"Zhang Yanqin,&nbsp;Zhao Rong,&nbsp;Tao Jianting,&nbsp;Wang Mulan,&nbsp;Kong Pengrui","doi":"10.1002/ls.1694","DOIUrl":"10.1002/ls.1694","url":null,"abstract":"<p>The oil film lubrication performance of a large hydrostatic turntable operating at the model of constant surface cutting speed is studied. Firstly, the rotary speed equation which is bound by the constant surface cutting speed is established. According to the fluid lubrication theory, the gap flow equation, the oil film temperature rise equation and the double-rectangular-cavity oil pad bearing capacity equation are derived. Further, a prediction model of oil film lubrication performance in the operating mode is established. The change rules of temperature, pressure and other performance indexes of the film with time are obtained by numerical simulation. And, the above laws are verified by design experiments. It is found that the cutting speed, feed rate leaves a significant impact on the law of variations of oil film performance with time. According to the conclusions, it will be beneficial to improve the bearing capacity of the hydrostatic turntable and further improve the machining accuracy by using cutting parameters reasonably to control the speed within a certain range.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 4","pages":"330-340"},"PeriodicalIF":1.9,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new efficient flow continuity lubrication model for the cylinder liner-piston ring based on the locally oriented roughness 基于局部定向粗糙度的气缸套-活塞环新型高效流动连续性润滑模型
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-18 DOI: 10.1002/ls.1680
Wen-Bin Chen, De-Liang Liu, Jiu-Jun Xu
{"title":"A new efficient flow continuity lubrication model for the cylinder liner-piston ring based on the locally oriented roughness","authors":"Wen-Bin Chen,&nbsp;De-Liang Liu,&nbsp;Jiu-Jun Xu","doi":"10.1002/ls.1680","DOIUrl":"10.1002/ls.1680","url":null,"abstract":"<p>The locally oriented roughness is a common feature of surface finished by a machining process, such as the surface of the cylinder liner, and may significantly influence lubrication characteristic. A homogenised transient Reynolds equation for the locally oriented roughness is derived. The Jacobsson–Floberg–Olsson (JFO) boundary conditions was implicitly incorporated into the transient Reynolds equation to ensure the mass flow conservation. On this foundation, a model for the transient lubrication in the cylinder liner-piston ring considering the effects of the surface roughness and cavitation is established. Then, the results of model developed here are compared with those from the stochastic model by Patir and Cheng. and the effect of the direction of roughness on the lubrication properties is analysed. The homogenised transient Reynolds equation and the lubrication model developed here have great potential for understanding and optimising the transient lubrication considering the surface local roughness orientation, cavitation and starved lubrication.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 4","pages":"298-313"},"PeriodicalIF":1.9,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139496112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of different base oils on the friction behaviour of polycrystalline diamond compact 不同基础油对多晶金刚石压实摩擦性能的影响
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-14 DOI: 10.1002/ls.1692
Ruyi Gou, Jingjing Chen, Xun Luo
{"title":"Effect of different base oils on the friction behaviour of polycrystalline diamond compact","authors":"Ruyi Gou,&nbsp;Jingjing Chen,&nbsp;Xun Luo","doi":"10.1002/ls.1692","DOIUrl":"10.1002/ls.1692","url":null,"abstract":"<p>This study analysed and discussed the friction and wear properties, as well as the interface evolution behaviour of polycrystalline diamond compact (PDC) under various base oils, through conducting friction experiments on PDC/Si<sub>3</sub>N<sub>4</sub> with different base oils. The friction and lubrication mechanism of PDC under different base oils were examined using scanning electron microscopy (SEM), x-ray energy dispersive spectrometry (EDS), three-dimensional white light interferometry, and Raman spectroscopy. The results of the study demonstrated that PDC exhibited the best friction and wear performance when lubricated with synthetic oil PAO, followed by castor oil. The inferior performance of paraffin oil can be attributed to its low viscosity, resulting in a lower presence of ions capable of passivating the carbon dangling bond. Consequently, paraffin oil displayed inadequate oxidation stability and increased susceptibility to oil film destruction, ultimately leading to suboptimal friction and wear characteristics. Overall, this study provides valuable insights for industrial applications, aiding in the selection of appropriate base oils as cutting fluids for PDC cutting tools and enhancing the friction and wear properties of PDC.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 4","pages":"286-297"},"PeriodicalIF":1.9,"publicationDate":"2024-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139475824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on the cavitation characteristics and structural optimisation of spiral grooved thrust bearing lubricated by liquid hydrogen 液氢润滑螺旋槽推力轴承的气蚀特性和结构优化研究
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-07 DOI: 10.1002/ls.1690
Shaohang Yan, Tianwei Lai, Mingchen Qiang, Qi Zhao, Wenjing Ding, Yutao Liu, Yu Hou
{"title":"Research on the cavitation characteristics and structural optimisation of spiral grooved thrust bearing lubricated by liquid hydrogen","authors":"Shaohang Yan,&nbsp;Tianwei Lai,&nbsp;Mingchen Qiang,&nbsp;Qi Zhao,&nbsp;Wenjing Ding,&nbsp;Yutao Liu,&nbsp;Yu Hou","doi":"10.1002/ls.1690","DOIUrl":"10.1002/ls.1690","url":null,"abstract":"<p>In liquid hydrogen (LH<sub>2</sub>) delivery, submersible centrifugal pump is an important device. Its reliability and efficiency rely on the stability of the bearings. In a high-speed range, cavitation occurs due to the hydrodynamic effect induced pressure undulation. Compared with other cryogenic fluids, cavitation in LH<sub>2</sub> is prone to happen due to its special properties. In this paper, a cavitation model considering thermal properties of LH<sub>2</sub> is proposed based on Rayleigh–Plesset equation. Cavitation characteristics are studied in spiral grooved thrust bearing (SGTB) lubricated by LH<sub>2</sub>. The effect of cavitation on load capacity and friction torque are investigated. The most severely-eroded location is predicted by the distribution of mass transfer rate. The influence of bearing structure parameters is studied in respect of cavitation, load capacity and friction torque. The analysis of variance (ANOVA) and range analysis results may provide a reference for optimising LH<sub>2</sub> lubricated SGTB.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 4","pages":"241-258"},"PeriodicalIF":1.9,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ls.1690","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139398082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laboratory measuring of contact angles for liquid/solid surface and analysis with artificial neural network 实验室测量液体/固体表面的接触角并利用人工神经网络进行分析
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-07 DOI: 10.1002/ls.1683
Sajad Jaberi, Gholamreza Moradi, Seyed Ali Alavi Fazel
{"title":"Laboratory measuring of contact angles for liquid/solid surface and analysis with artificial neural network","authors":"Sajad Jaberi,&nbsp;Gholamreza Moradi,&nbsp;Seyed Ali Alavi Fazel","doi":"10.1002/ls.1683","DOIUrl":"10.1002/ls.1683","url":null,"abstract":"<p>In this study, the advancing and receding contact angles of three types of pure liquid on four different surfaces have been measured. The contact angles of the droplet have been measured by analysing the captured photo by tilted plate method. Droplet behaviour has been modelled by two experimental equations. Additionally, the data has been modelled by an artificial neural network using genetic algorithm and a hyperbolic tangent activation function. The input parameters are density, molecular weight of pure liquid and solid, viscosity and surface tension of pure liquid, roughness of the solid surface and the two outputs are advancing and receding contact angles of the droplet. Number of 81 data points were used for training, 27 data for validation and 28 data for testing. The topography of {7,7,2} for artificial neural network has been proposed. The resulting RMS errors were 8%, 8% and 7% for training, validation and testing, respectively.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 4","pages":"277-285"},"PeriodicalIF":1.9,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139398242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical study on the churning power loss of spiral bevel gears at splash lubrication system 飞溅润滑系统中螺旋锥齿轮搅动功率损失的数值研究
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-07 DOI: 10.1002/ls.1688
Shuai Hu, Wuqi Gong, Peng Gui
{"title":"Numerical study on the churning power loss of spiral bevel gears at splash lubrication system","authors":"Shuai Hu,&nbsp;Wuqi Gong,&nbsp;Peng Gui","doi":"10.1002/ls.1688","DOIUrl":"10.1002/ls.1688","url":null,"abstract":"<p>In order to predict the spiral bevel gear churning power loss, based on the Computational Fluid Dynamics (CFD) method, the computational model for the splash lubrication of the spiral bevel gear pair is established and validated by experiments. The churning power loss of spiral bevel gears is obtained and the corresponding flow field distribution in the gearbox with a pair of spiral bevel gears is analysed under a standard operating condition. For the churning power loss of spiral bevel gears, the loss of teeth surface is mainly caused by pressure while the loss of gear side is mainly generated by the viscous force. The effects of the gear rotational speed, oil level, oil temperature and oil shroud on the churning loss are also investigated and analysed. Ultimately, an optimisation method is proposed for the original spiral bevel geared transmission.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 4","pages":"259-276"},"PeriodicalIF":1.9,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139398028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the solution algorithm of Reynolds equation of self-acting gas journal bearings based on a finite difference method 基于有限差分法的自作用气体轴颈轴承雷诺方程求解算法研究
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-04 DOI: 10.1002/ls.1691
Zhang Haijun, Yang Qin, Zhao Wei, Jiang Feilong
{"title":"Study on the solution algorithm of Reynolds equation of self-acting gas journal bearings based on a finite difference method","authors":"Zhang Haijun,&nbsp;Yang Qin,&nbsp;Zhao Wei,&nbsp;Jiang Feilong","doi":"10.1002/ls.1691","DOIUrl":"10.1002/ls.1691","url":null,"abstract":"<p>It is very crucial to solve the Reynolds equation quickly and accurately using the numerical methods in the research field of fluid lubrication. For the static Reynolds equation of self-acting gas journal bearings, the typical solution algorithm of the finite difference method is put forward and a new solution algorithm of the finite difference method is proposed. Secondly, the Reynolds equation is solved numerically with the same parameters and the pressure distribution of gas bearings is obtained. Finally, the numerical solution from the new solution algorithm can be obtained with less number of iterations and the less computing time under the different computational grids and bearing numbers. Therefore, the new solution algorithm of the finite difference method is superior to the typical solution algorithm of the finite difference method.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 3","pages":"231-237"},"PeriodicalIF":1.9,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139372774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on internal two-phase flow in the local micro-clearance design of a high-speed ball bearing with under-race lubrication 带下滚道润滑的高速球轴承局部微隙设计中的内部两相流研究
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-03 DOI: 10.1002/ls.1679
Ping Gong, Zhenxia Liu, Qingjie Yu, Fei Chen
{"title":"Research on internal two-phase flow in the local micro-clearance design of a high-speed ball bearing with under-race lubrication","authors":"Ping Gong,&nbsp;Zhenxia Liu,&nbsp;Qingjie Yu,&nbsp;Fei Chen","doi":"10.1002/ls.1679","DOIUrl":"10.1002/ls.1679","url":null,"abstract":"<p>In this research, an angular contact ball bearing with two-half inner rings is used as a carrier. Considering the two-phase flow characteristics of oil and air in the bearing, the flow characteristics of lubricating oil inside the bearing with under-race lubrication are studied. Based on the volume of fluid (VOF) method and the standard <i>k</i>–<i>ε</i> turbulent flow model, the characteristics of oil and air two-phase flow inside the ball bearing are analysed. The bearing internal pressure field distribution, streamline distribution, and other flow properties for the different radial working clearances, pocket clearances and guide clearances are determined. The distribution of the lubricating oil in key areas is observed. The oil phase volume fraction of the key lubrication areas, such as the cage pocket surface and the inner and outer ring surfaces is used to evaluate the influence of different structural parameters on the bearing lubrication performance. The lubrication influences of the inner and outer guides of the cage are evaluated, and the internal flow characteristics of the bearing are analysed with different guide clearances. The results show that with the radial working clearance range from 0.100 to 0.145 mm, the pressure in the working contact area of the bearing decreases 26%. The pocket clearance ranges from 0.48 to 0.28 mm, and the pressure in the working contact area of the bearing significant increases from 0.642 to 1.165 MPa. From this perspective, the larger the radial working clearance and pocket clearance are, the more favourable it is for bearing lubrication. For bearings with under-ring lubrication, when the bearing adopts outer guidance, the distribution of lubricating oil in the key areas of the bearing is worse than that for internal guidance. However, the pressure in the working contact area of the bearing slightly increases from 0.642 to 0.759 MPa with the inner guide clearance increasing from 0.4 to 0.8 mm.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 3","pages":"216-230"},"PeriodicalIF":1.9,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139092447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of partial surface waviness on the dynamic and stability performance of journal bearing 部分表面波纹对轴颈轴承动态和稳定性能的影响
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2024-01-03 DOI: 10.1002/ls.1685
Arun Bangotra, Sanjay Sharma
{"title":"Effect of partial surface waviness on the dynamic and stability performance of journal bearing","authors":"Arun Bangotra,&nbsp;Sanjay Sharma","doi":"10.1002/ls.1685","DOIUrl":"10.1002/ls.1685","url":null,"abstract":"<p>This study presents the impact of full and partial surface waviness on the dynamic and stability performance of the journal bearing. The Reynolds equation is modified to account for the impact of surface waviness, and the lubricant domain is discretized using the Finite element method to obtain dynamic characteristics such as stiffness and damping coefficients and stability parameters, that is, threshold speed. Different wave numbers in the axial, circumferential and mixed directions are considered at variable wave amplitudes in different regions at an average eccentricity ratio of 0.6 to obtain the optimum values. The obtained results reveal that by application of waviness in the full region and partial waviness in the pressure-reducing region on the bearing surface provides the enhanced value of stability parameter, fluid film stiffness and dynamic coefficients as compared to the simple journal bearing under the same working conditions.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"36 3","pages":"197-215"},"PeriodicalIF":1.9,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139092883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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