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Advances in thin film lubrication(TFL): From discovery to the aroused further researches

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Science China(Technological Sciences) 2015年第10期58卷 1609-1616页

作者： MA LiRan luo jianbin State Key Laboratory of Tribology Tsinghua University

Thin film lubrication(TFL) is known as a mode of fluid-film lubrication regime bridging the gap between elastohydrodynamic lubrication(EHL) and boundary lubrication(BL). Since the first recorded literature published in 1995, TFL has become one of the landmarks in the development of lubrication theory over the last twenty years. This article presents an overview of the advances in the research of TFL regime. We first begin with a brief introduction of the discovery of the phenomenon, followed by the discussion of the relevant essential aspects, such as the performing approach, theory and physical model. The state-of-the-art studies on both the theoretical and experimental fields are also presented, also latter with emphasis on the review of researches in several promising applications.

关键词： thin film lubrication film thickness ordered structure interface

Thin film lubrication in the past 20 years

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Friction 2016年第4期4卷 280-302页

作者： Liran MA jianbin luo State Key Laboratory of Tribology Tsinghua University Beijing 100084 China

Thin film lubrication (TFL),a lubrication regime that fills the gap between boundary lubrication (BL)and elastohydrodynamic lubrication (EHL) regimes,was proposed 20 years *** it was first recorded in the literature,TFL has gained substantial interest and has been advanced in the fields of theoretical and experimental *** the revelation of the TFL phenomenon and its central ideas,many studies have been *** paper attempts to systematically review the major developments in terms of both the history and the advances in *** begins with the description and definition of TFL,followed by the state-of-art studies on experimental technologies and their *** prospects of relevant studies and applications are also discussed.

关键词： thin film lubrication TFL thin EHL film ordered structure interface

Micro/atomic-scale vibration induced superlubricity

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Friction 2021年第5期9卷 1163-1174页

作者： Shuai SHI Dan GUO jianbin luo State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China China Fortune Land Development Industrial Investment Co. Ltd.Beijing 100027China

With the rapid development of industry,the inconsistency between the rapid increase in energy consumption and the shortage of resources is becoming *** is one of the main causes of energy consumption;thus,the emergence of superlubricity technology can substantially improve the energy efficiency in motion *** this study,an efficient method to control superlubricity at the atomic‐scale is *** method employs vibrational excitation,which is called vibration induced superlubricity(VIS).The VIS can be easily and steadily achieved by employing external vibration in three *** simple method does not depend on the type of sample and *** of oscillation amplitude,frequency,scanning speed,and normal force(F_(N))on friction were *** and simulated explorations verified the practical approach for reducing energy dissipation and achieving superlubricity at the atomic‐scale.

关键词： superlubricity atomic‐scale vibration energy dissipation

Electrical bearing failures in electric vehicles

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Friction 2020年第1期8卷 4-28页

作者： Feng HE Guoxin XIE jianbin luo State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

In modern electric equipment,especially electric vehicles,inverter control systems can lead to complex shaft voltages and bearing *** an electric motor,many parts have electrical failure problems,and among which bearings are the most sensitive and vulnerable *** recent years,electrical failures in bearing have been frequently reported in electric vehicles,and the electrical failure of bearings has become a key issue that restricts the lifetime of all‐electric motor‐based power systems in a broader *** purpose of this review is to provide a comprehensive overview of the bearing premature failure in the mechanical systems exposed in an electrical environment represented by electric *** electrical environments in which bearing works including the different components and the origins of the shaft voltages and bearing currents,as well as the typical modes of electrical bearing failure including various topographical damages and lubrication failures,have been *** fundamental influence mechanisms of voltage/current on the friction/lubrication properties have been summarized and analyzed,and corresponding countermeasures have been ***,a brief introduction to the key technical flaws in the current researches will be made and the future outlook of frontier directions will be discussed.

关键词： electric vehicles bearing premature failure electrical environment shaft voltage

Dynamic friction energy dissipation and enhanced contrast in high frequency bimodal atomic force microscopy

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Friction 2022年第5期10卷 748-761页

作者： Xinfeng TAN Dan GUO jianbin luo State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Dynamic friction occurs not only between two contact objects sliding against each other,but also between two relative sliding surfaces several nanometres *** emerging micro-and nano-mechanical systems that promise new applications in sensors or information technology may suffer or benefit from noncontact *** we demonstrate the distance-dependent friction energy dissipation between the tip and the heterogeneous polymers by the bimodal atomic force microscopy(AFM)method driving the second order flexural and the first order torsional vibration *** pull-in problem caused by the attractive force is avoided,and the friction dissipation can be imaged near the *** friction dissipation coefficient concept is proposed and three different contact states are determined from phase and energy dissipation *** contrast is enhanced in the intermediate setpoint *** work offers an effective method for directly detecting the friction dissipation and high resolution images,which overcomes the disadvantages of existing methods such as contact mode AFM or other contact friction and wear measuring instruments.

关键词： dynamic friction energy dissipation contact states image contrast bimodal atomic force microscopy(AFM)

L^(*)—An index for evaluating long range performance of autonomous underwater vehicles(AUVs)

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Friction 2024年第10期12卷 2205-2221页

作者： Manfu ZHU Liran MA jianbin luo State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

Autonomous underwater vehicles(AUVs)have various applications in both military and civilian fields.A wider operation area and more complex tasks require better overall range performance of ***,until recently,there have been few unified criteria for evaluating the range performance of *** the present work,a unified range index,i.e.,L^(*),considering the cruising speed,the sailing distance,and the volume of an AUV,is proposed for the first time,which can overcome the shortcomings of previous criteria using merely one single parameter,and provide a uniform criterion for the overall range performance of various *** constructing the expression of the L^(*)index,the relevant data of 49 AUVs from 12 countries worldwide have been collected,and the characteristics of the L^(*)range index in different countries and different categories were compared and ***,by analyzing the complex factors affecting the range index,methods to enhance the L^(*)range index value,such as efficiency enhancement and drag reduction,have been introduced and *** this condition,the work proposes a unified and scientific criterion for evaluating the range performance of AUVs for the first time,provides valuable theoretical insight for the development of AUVs with higher performance,and then arouses more attention to the application of the cutting-edge superlubricity technology to the field of underwater vehicles,which might greatly help to accelerate the coming of the era of the superlubricitive engineering.

关键词： autonomous underwater vehicles(AUVs) range performance range index superlubricity drag reduction

Guest editorial:Special Issue on Biomedical Tribology

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Friction 2022年第1期10卷 2-3页

作者： Guoxin XIE jianbin luo State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Biomedical tribology has developed rapidly with the joint efforts of medical and tribological researchers,and it concerns various kinds of friction that existed inside and out side the body,such as the friction of joints,the friction between skin and clothing,and the friction in the lumen(blood vessels,trachea,digestive tube,and excretory tube),which causes maiiy physiological changes and diseases in the human ***,many medical devices have been used to treat or alleviate various *** tribology plays a vital role in solving the widespread tribological issues in the medical devices field,aiming to improve the performance of medical devices and prolong the service life.

关键词： friction tribological service

Advancements in superlubricity

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Science China(Technological Sciences) 2013年第12期56卷 2877-2887页

作者： LI JinJin luo jianbin State Key Laboratory of Tribology Tsinghua University

Superlubricity is a new area in tribology,in which the slide friction coefficient is about 1/1000 to 1/100 of the general *** the concept of superlubricity was proposed,it has attracted more and more attentions from researchers in fields of tribology,physics,chemistry,materials,*** significant progresses have been made during the last two decades in experimental studies on *** the present work,the recent advancements in solid superlubricity and liquid superlubricity are reviewed and the lubricating mechanisms of different superlubricity systems are ***,the problems on the superlubricity mechanism and the development of superlubricity in the future are addressed.

关键词： friction superlubricity solid superlubricating lubricants liquid superlubricating lubricants

Guest editorial: Special issue on 6th World Tribology Congress

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Friction 2017年第3期5卷 231-232页

作者： jianbin luo State Key Laboratory of Tribology Tsinghua University Beijing 100084 China

The 6th World Tribology Congress (WTC 2017),hosted by Chinese Tribology Institute (CTI) and organized by the State Key Laboratory of Tribology (SKLT) of Tsinghua University,will be held in Beijing,China,on September 17-22,*** objective of the congress is to highlight recent important progress in tribology and to strengthen the links between academia and *** than 900 oral presentations and over 300 posters have been accepted in 9 tracks,170 oral sessions and 2 poster *** exhibition and networking on WTC 2017 are designed to broaden knowledge and provide a range of perspectives on tribology.A technical exhibition and some visits to SKLT of Tsinghua University are also organized.

关键词： Tribology