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A measurement system for thin elastohydrodynamic lubrication films
WANG Xuefeng, GUO Feng, YANG Peiran
《机械工程前沿(英文)》 2007年 第2卷 第2期 页码 193-196 doi: 10.1007/s11465-007-0032-8
关键词: instrumentation continuous measurement elastohydrodynamic lubrication ultra-thin measurement
Thermal analysis of lubricated three-dimensional contact bodies considering interface roughness
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0672-8
关键词: thermal elastohydrodynamic lubrication surface roughness effect thermal effect temperature characteristics severe conditions
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 156-167 doi: 10.1007/s11465-014-0297-7
A fast compound direct iterative algorithm for solving transient line contact elastohydrodynamic lubrication (EHL) problems is presented. First, by introducing a special matrix splitting iteration method into the traditional compound direct iterative method, the full matrices for the linear systems of equations are transformed into sparse banded ones with any half-bandwidth; then, an extended Thomas method which can solve banded linear systems with any half-bandwidth is derived to accelerate the computing speed. Through the above two steps, the computational complexity of each iteration is reduced approximately from O(N3/3) to O(β2N), where N is the total number of nodes, and β is the half-bandwidth. Two kinds of numerical results of transient EHL line contact problems under sinusoidal excitation or pure normal approach process are obtained. The results demonstrate that the new algorithm increases computing speed several times more than the traditional compound direct iterative method with the same numerical precision. Also the results show that the new algorithm can get the best computing speed and robustness when the ratio, half-bandwidth to total number of nodes, is about 7.5%–10.0% in moderate load cases.
关键词: elastohydrodynamic lubrication transient line contact matrix splitting iteration method the Thomas method
Influence of temperature on cam-tappet lubrication in an internal combustion engine
CHANG Qiuying, YANG Peiran, WANG Jing, CHEN Quanshi
《机械工程前沿(英文)》 2007年 第2卷 第4期 页码 489-492 doi: 10.1007/s11465-007-0085-8
关键词: coefficient combustion isothermal elastohydrodynamic temperature thickness
Cryogenic minimum quantity lubrication machining: from mechanism to application
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 649-697 doi: 10.1007/s11465-021-0654-2
关键词: cryogenic minimum quantity lubrication (CMQL) cryogenic medium processing mode device application mechanism application effect
Iteration framework for solving mixed lubrication computation problems
《机械工程前沿(英文)》 2021年 第16卷 第3期 页码 635-648 doi: 10.1007/s11465-021-0632-8
关键词: mixed lubrication discretization formula relative error Reynolds equation asperity
《机械工程前沿(英文)》 2023年 第18卷 第1期 doi: 10.1007/s11465-022-0733-z
关键词: grinding minimum quantity lubrication carbon group nanofluid tribological mechanism
雒建斌,张朝辉,温诗铸
《中国工程科学》 2003年 第5卷 第7期 页码 84-89
薄膜润滑是20世纪90年代以来广泛研究的新型润滑状态。它是界于弹流润滑和边界润滑之间的一种过渡润滑状态,有着自己独特的润滑规律。文章回顾了薄膜润滑的研究历史,包括薄膜润滑概念的提出、测试技术的发展、薄膜润滑的膜厚特性、润滑机理探索以及计算理论等方面的研究成果与主要进展。
Technological lubricating means: Evolution of materials and ideas
Vladimir A. GODLEVSKIY
《机械工程前沿(英文)》 2016年 第11卷 第1期 页码 101-107 doi: 10.1007/s11465-016-0369-y
The main stages of technological lubricating material development from ancient times to date are described. How the chemical composition of these products changed with time, how new ideas revealing the physical and chemical basics of external media that influence the mechanical processing of materials appeared, how these ideas explained the differences between traditional tribology and specific technology of metal processing are discussed. The question of the possible realization of Rehbinder’s adsorption effect in contact zone is also stated. The description of a very captivating problem is related to the explanation of the mechanism of lubricant penetration into the contact zone between the material being processed and the tool. The birth and development of the hypothesis of microcapillary penetration of the lubricant into the dynamically changed intersurface clearance that has finally led to formulating the “necessary kinetic condition of the lubricating activity” is relayed.
关键词: technological lubrication and cooling metal cutting grinding lubrication action tribology
Calculated journal bearing lubrication of non-Newtonian medium with surface roughness effects
CHEN Hao-sheng, CHEN Da-rong, WANG Jia-dao, LI Yong-jian
《机械工程前沿(英文)》 2006年 第1卷 第3期 页码 270-275 doi: 10.1007/s11465-006-0028-9
曲庆文,柴山,姚福生
《中国工程科学》 2003年 第5卷 第6期 页码 44-48
薄膜润滑轴承的特性远不同于常规轴承,在考虑间隙对润滑剂产生的影响后,润滑剂的特性将发生较大的变化。由于这种变化,薄膜润滑的特性才被广泛地研究和重视。文章应用等效粘度修正模型对径向滑动轴承进行了性能分析,对无限宽轴承可得出压力计算的解析表达式,从而可精确地计算轴承的性能。
Fiber-reinforced composites in milling and grinding: machining bottlenecks and advanced strategies
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0680-8
关键词: milling grinding fiber-reinforced composites damage formation mechanism delamination material removal mechanism surface integrity minimum quantity lubrication
Jinya KATSUYAMA, Shumpei UNO, Tadashi WATANABE, Yinsheng LI
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 563-570 doi: 10.1007/s11465-018-0487-9
The thermal hydraulic (TH) behavior of coo-lant water is a key factor in the structural integrity assessments on reactor pressure vessels (RPVs) of pressurized water reactors (PWRs) under pressurized thermal shock (PTS) events, because the TH behavior may affect the loading conditions in the assessment. From the viewpoint of TH behavior, configuration of plant equipment and their dimensions, and operator action time considerably influence various parameters, such as the temperature and flow rate of coolant water and inner pressure. In this study, to investigate the influence of the operator action time on TH behavior during a PTS event, we developed an analysis model for a typical Japanese PWR plant, including the RPV and the main components of both primary and secondary systems, and performed TH analyses by using a system analysis code called RELAP5. We applied two different operator action times based on the Japanese and the United States (US) rules: Operators may act after 10 min (Japanese rules) and 30 min (the US rules) after the occurrence of PTS events. Based on the results of TH analysis with different operator action times, we also performed structural analyses for evaluating thermal-stress distributions in the RPV during PTS events as loading conditions in the structural integrity assessment. From the analysis results, it was clarified that differences in operator action times significantly affect TH behavior and loading conditions, as the Japanese rule may lead to lower stresses than that under the US rule because an earlier operator action caused lower pressure in the RPV.
关键词: structural integrity reactor pressure vessel pressurized thermal shock thermal hydraulic analysis pressurized water reactor weld residual stress
Assessment indices for uniform and non-uniform thermal environments
ZHANG Yufeng, SUN Shufeng, ZHAO Rongyi
《能源前沿(英文)》 2008年 第2卷 第2期 页码 129-133 doi: 10.1007/s11708-008-0029-y
关键词: thermal sensation proper assessment relationship equivalent thermal acceptability
Liquid metal thermal hydraulics R&D at European scale: achievements and prospects
《能源前沿(英文)》 2021年 第15卷 第4期 页码 842-853 doi: 10.1007/s11708-021-0743-2
标题 作者 时间 类型 操作
A measurement system for thin elastohydrodynamic lubrication films
WANG Xuefeng, GUO Feng, YANG Peiran
期刊论文
Thermal analysis of lubricated three-dimensional contact bodies considering interface roughness
期刊论文
A fast compound direct iterative algorithm for solving transient line contact elastohydrodynamic lubrication
null
期刊论文
Influence of temperature on cam-tappet lubrication in an internal combustion engine
CHANG Qiuying, YANG Peiran, WANG Jing, CHEN Quanshi
期刊论文
Tribological mechanism of carbon group nanofluids on grinding interface under minimum quantity lubrication
期刊论文
Calculated journal bearing lubrication of non-Newtonian medium with surface roughness effects
CHEN Hao-sheng, CHEN Da-rong, WANG Jia-dao, LI Yong-jian
期刊论文
Fiber-reinforced composites in milling and grinding: machining bottlenecks and advanced strategies
期刊论文
Influence evaluation of loading conditions during pressurized thermal shock transients based on thermal-hydraulics
Jinya KATSUYAMA, Shumpei UNO, Tadashi WATANABE, Yinsheng LI
期刊论文
Assessment indices for uniform and non-uniform thermal environments
ZHANG Yufeng, SUN Shufeng, ZHAO Rongyi
期刊论文