Lubrication Science最新文献_第2页

Static and Dynamic Analysis of Porous Gas Bearings Lubricated With Air, Refrigerant R-134a, Helium and Hydrogen 用空气、制冷剂R-134a、氦和氢润滑多孔气体轴承的静态和动态分析

IF 2.1 4区工程技术

Lubrication Science Pub Date : 2026-07-02 Epub Date: 2026-03-11 DOI: 10.1002/ls.70032

S. Bechiri, B. Bouchehit, B. Bou-Saïd

{"title":"Static and Dynamic Analysis of Porous Gas Bearings Lubricated With Air, Refrigerant R-134a, Helium and Hydrogen","authors":"S. Bechiri, B. Bouchehit, B. Bou-Saïd","doi":"10.1002/ls.70032","DOIUrl":"https://doi.org/10.1002/ls.70032","url":null,"abstract":"<p>Porous gas bearings (PGBs) enable high-speed, oil-free operation in modern rotating machinery. This study develops a coupled thermo-hydrodynamic (THD) model for a cylindrical porous gas bearing lubricated with four working fluids—air, R-134a, helium and hydrogen. The modified Reynolds equation is derived by combining the Navier–Stokes and continuity equations with the Morgan–Cameron approximation, Darcy–Forchheimer law and Beavers–Joseph slip condition. Gas compressibility and vapour–liquid transition are represented through the Peng–Robinson equation of state. Steady-state and dynamic analyses are performed to evaluate the influence of permeability and slip on load capacity, pressure distribution, flow rate, friction torque, temperature field and stiffness and damping coefficients. Results show that increasing permeability decreases pressure and load capacity but promotes better thermal uniformity, whilst higher slip coefficients improve film stability and reduce shear losses. Amongst the gases considered, hydrogen exhibits the lowest film thickness due to its low viscosity, whereas helium yields superior thermal behaviour. The combined model provides a reliable computational framework for optimising porous gas bearings under realistic operating conditions.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"38 5","pages":"301-326"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ls.70032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148373461","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}

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IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-05-10

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IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-05-10

引用次数: 0

Optimisation of Key Parameters of Oil Injection Lubrication and Analysis of Lubrication Efficiency of Textured Gears 喷油润滑关键参数优化及织构齿轮润滑效率分析

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-03-16 Epub Date: 2026-01-26 DOI: 10.1002/ls.70016

Ziqiang Zhang, Junye Li, Tiangang Zou, Wei Hou, Yuanyuan An, Jianhe Liu

{"title":"Optimisation of Key Parameters of Oil Injection Lubrication and Analysis of Lubrication Efficiency of Textured Gears","authors":"Ziqiang Zhang, Junye Li, Tiangang Zou, Wei Hou, Yuanyuan An, Jianhe Liu","doi":"10.1002/ls.70016","DOIUrl":"https://doi.org/10.1002/ls.70016","url":null,"abstract":"<div>\u0000 \u0000 <p>To improve gear lubrication efficiency, this paper designs a new arc groove gear structure and proposes an optimised nozzle arrangement based on it. Firstly, the effect of nozzle arrangement on tooth surface temperature is studied through simulation analysis. The results show that under the NO1–NO16 nozzle layouts, the tooth surface temperature of the arc groove gear is lower than that of conventional gears. Among these, the NO13 nozzle layouts offers the best cooling efficiency and lubrication effect, reducing tooth surface temperature by 10.21 K compared to conventional gears and increasing cooling efficiency by 3.29%. Secondly, under NO1–NO16 nozzle layouts, oil volume fraction in the meshing zone of the arc groove gear significantly exceeds that of conventional gears, specifically, nozzle layout NO13 achieves a 10.88% higher oil volume fraction and a 74.77% increase in oil utilisation rate. Finally, orthogonal experiment analysis reveals that among the 16 layouts, NO13 has the smallest tooth surface temperature difference-reducing it by 9.8°C compared to conventional gears—and increases heat dissipation efficiency by 24.20%. The optimal nozzle parameters are: injection distance of 60 mm, injection angle of 15°, nozzle diameter of 3.5 mm, and speed of 2500 r/min. The order of influence on tooth surface temperature is: nozzle diameter > injection distance > rotation speed > injection angle.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"38 3","pages":"130-150"},"PeriodicalIF":1.9,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147569417","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

The Anti-Friction Mechanism of Si-DLC Films by Water Molecules: A ReaxFF Molecular Dynamics Study 水分子对Si-DLC膜的抗摩擦机理：ReaxFF分子动力学研究

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-03-16 Epub Date: 2026-03-08 DOI: 10.1002/ls.70026

Faye Feng, Lv Yang, Xukai Yao, Yin Zhou, Jiabin Cai, Huaichao Wu

{"title":"The Anti-Friction Mechanism of Si-DLC Films by Water Molecules: A ReaxFF Molecular Dynamics Study","authors":"Faye Feng, Lv Yang, Xukai Yao, Yin Zhou, Jiabin Cai, Huaichao Wu","doi":"10.1002/ls.70026","DOIUrl":"https://doi.org/10.1002/ls.70026","url":null,"abstract":"<div>\u0000 \u0000 <p>Identifying appropriate application conditions for various doped-DLC films is essential for maximizing their performance and extending service life, which also highlights the need to understand how environmental factors influence their tribological behaviour. Given that the tribological properties of Si-DLC films are strongly affected by the presence of water molecules, this study employs ReaxFF molecular dynamics simulations to explore how water modifies their frictional behaviour and to uncover the underlying mechanisms. This study demonstrates that when only a limited number of water molecules are present, two separate mechanisms are responsible for reducing friction in Si-DLC films. Under high-friction conditions, water molecules undergo decomposition and the released H and O atoms interact with the Si-DLC surface, passivating it and consequently lowering friction. Meanwhile, the migration of Si atoms to the contact surface results in the generation of a silicon-rich tribolayer with low shear strength, further reducing resistance. By contrast, in water-rich systems, Si-OH groups generated on the contact surface promote water adsorption and lead to the generation of a continuous hydration layer, which markedly enhances lubrication and reduces friction. These results confirm that the improvement of tribological properties in Si-DLC films by water molecules is closely linked to tribochemical reactions, offering new insights into the behaviour of Si-DLC in humid environments.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"38 3","pages":"151-162"},"PeriodicalIF":1.9,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147564188","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

Analysis of TEHL Characteristics of Modified VH-CATT Cylindrical Gear 改进型VH-CATT圆柱齿轮TEHL特性分析

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-03-16 Epub Date: 2026-01-23 DOI: 10.1002/ls.70015

Linli Bao, Yongping Liu, Changbin Dong

{"title":"Analysis of TEHL Characteristics of Modified VH-CATT Cylindrical Gear","authors":"Linli Bao, Yongping Liu, Changbin Dong","doi":"10.1002/ls.70015","DOIUrl":"https://doi.org/10.1002/ls.70015","url":null,"abstract":"<div>\u0000 \u0000 <p>Addressing the challenges of inadequate lubrication performance and limited thermal stability of variable hyperbolic circular-arc-tooth-trace (VH-CATT) cylindrical gear pairs under conditions of high speed and heavy load, this study presents a multi-field coupled thermo-elastohydrodynamic lubrication (TEHL) model. The model integrates cutter tilt-induced lead modification, tooth contact analysis (TCA), finite element-based contact mechanics and thermal-elastohydrodynamic lubrication simulations. By selecting representative meshing instances, the research systematically examines the combined influence of entrainment angle (<i>θ</i>ₑ) and lead modification angle (<i>γ</i>) on key parameters, including oil film thickness, pressure distribution and temperature elevation. The findings indicate that when <i>θ</i>ₑ deviates from 0° to either less than 0° or greater than 0°, the minimum oil film thickness decreases by approximately 5.03%. Concurrently, the maximum oil film pressure exhibits an increase of 22.33% and a decrease of 21.14%, respectively, while the temperature rise diminishes by 63.81% and 34.12%, respectively. Upon the introduction of lead modification with <i>γ</i> set at 5°, variations in <i>θ</i>ₑ below and above 0° result in reductions in minimum oil film thickness by 4.29% and 4.81%, respectively; decreases in maximum pressure by 8.89% and 3.97%, respectively; and changes in temperature rise characterised by a decrease of 83.75% and an increase of 72.94%, respectively. A comprehensive evaluation suggests that maintaining <i>θ</i>ₑ within the range of 0°–5°, alongside <i>γ</i> fixed at 5°, facilitates the synergistic optimisation of lubrication integrity, load-bearing capacity and thermal management performance. This insight offers a theoretical framework and practical foundation for enhancing lubrication efficacy and structural design of VH-CATT cylindrical gear pairs under complex thermal loading conditions.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"38 3","pages":"111-129"},"PeriodicalIF":1.9,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147568018","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}

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Numerical Analysis and Optimization of Water-Lubricated Journal Bearings Utilising ANN Under Diverse Operating Conditions 基于神经网络的水润滑滑动轴承在不同工况下的数值分析与优化

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-03-16 Epub Date: 2026-01-19 DOI: 10.1002/ls.70014

Praveen Kumar, Jitendra Yadav, Ram Kunwer

{"title":"Numerical Analysis and Optimization of Water-Lubricated Journal Bearings Utilising ANN Under Diverse Operating Conditions","authors":"Praveen Kumar, Jitendra Yadav, Ram Kunwer","doi":"10.1002/ls.70014","DOIUrl":"https://doi.org/10.1002/ls.70014","url":null,"abstract":"<div>\u0000 \u0000 <p>This study uses a parametric optimization and characteristic analysis of water-lubricated bearings (WLB) under various design configurations and operating conditions. To characterise the performance of WLB, 31 simulation cases were designed using the Taguchi method. The study examines the impact of key design and operating parameters—specifically, attitude angle, eccentricity ratio, length-to-diameter (<i>L</i>/<i>D</i>) ratio and rotational speed (RPM)—on the resulting temperature distribution, structural deformation and stress within the bearing. The results show that increasing the eccentricity ratio improves the load-bearing capacity, with the peak pressure rising from 500 000 Pa (<i>e</i>/<i>c</i> = 0.5) to 4 060 000 Pa (<i>e</i>/<i>c</i> = 0.9). Similarly, attitude angle has a significant effect on hydrodynamic pressure. The result shows that when the attitude angle goes from 20° to 60°, the maximum pressure goes from 730 000 to 1 960 000 Pa. The impact of RPM fluctuations on the temperature of the water film is apparent, with Case 21 (450 RPM) measuring 305.88 K, while Case 14 (525 RPM) attains 314.32 K, illustrating the influence of rotational speed on thermal dissipation. Furthermore, ANN-based optimization was employed to determine the optimal design and operating parameters for achieving maximum load-bearing capacity and minimising heat dissipation. This led to an ideal bearing pressure of 35589.14 Pa and a water film temperature of 314.32 K. This study provides valuable insights into optimising the performance of water-lubricated journal bearings, enhancing their longevity and reliability in industrial, maritime and hydropower applications.</p>\u0000 </div>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"38 3","pages":"97-110"},"PeriodicalIF":1.9,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147566924","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}

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IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-03-09

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IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-03-09

引用次数: 0

IF 1.9 4区工程技术

Lubrication Science Pub Date : 2026-03-09

引用次数: 0