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Tribological behavior of co-textured cylinder liner-piston ring during running-in

Friction 2022年第6期10卷 878-890页

作者： Chenwei MIAO zhiwei guo Chengqing YUAN School of Energy and Power Engineering Wuhan University of TechnologyWuhan 430063China Reliability Engineering Institute National Engineering Research Center for Water Transportation SafetyWuhan 430063China

The running-in of cylinder liner-piston rings(CLPRs)is the most important process that must be performed before a marine diesel engine can be *** quality of running-in directly affects the reliability of a *** surface texture of a CLPR has been proven to significantly affect its lubrication *** this study,the tribological behavior of a CLPR during running-in is *** types of surface textures are generated on the CLPR via laser processing:dimple texture on piston rings,groove texture on cylinder liners,and co-texture on both ***,a series of tests are performed on a slice tester.A load of 300 N(1.64 MPa) is applied,and two speeds(50 and 100 rpm)are *** CLPR running-in quality is characterized based on three parameters,i.e.,the friction coefficient,contact resistance,and wear *** results show that,compared with a non-textured surface,the three types of surface textures mentioned above improved the friction performance during *** lubricant supply capacity of the dimple texture on the piston ring,as a mobile oil reservoir,is stronger than that of the groove texture on the cylinder liner serving as a static oil *** contrast,the wear resistance of the dimple texture,as a movable debris trap on the piston ring,is weaker than that of the groove texture on the cylinder liner,which serves as a static debris *** is demonstrated that the co-texture combines the advantages of dimples and groove *** with non-textured surfaces,the friction coefficient decreased the most at 100 rpm(44.5%),and the contact resistance improved the most at 50 rpm(352.9%).The coupling effect provides the surface with improved running-in quality by optimizing the tribological performance,particularly at the dead *** study provides guidance for the tribological design and manufacturing of CLPR in marine diesel engines.

关键词： marine diesel engine cylinder liner-piston ring running-in process co-texture tribological performance

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Insight into the Lubrication Performance of Biomimetic Porous Structure Material for Water-lubricated Bearings

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Journal of Bionic Engineering 2023年第5期20卷 1905-1916页

作者： Xuefei Li zhiwei guo Qiren Huang Chengqing Yuan School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan430063China National Engineering Research Center for Water Transport Safety Reliability Engineering InstituteWuhan430063China

Water-lubricated bearings have great advantages in the application of ship tail bearings due to the characteristics of green,pollution-free,and ***,the poor wettability of water-lubricated materials,as well as the low viscosity and poor load-carrying capacity of water,resulting in poor lubricating film integrity and short material service life under low-speed,heavy-load,start-stop conditions,which limits its *** study the relationship between wettability and lubrication state and improve the lubrication performance of Si_(3)N_(4) under water lubrication conditions,the characteristic parameters that determine the hydrophilicity of Sphagnum were detected and extracted,and the bionic Si_(3)N_(4) model was established using Material ***,the molecular dynamic behavior and tribological properties of different Si_(3)N_(4) models were simulated and *** structure affects the spreading and storage of water on the material surface and changes the wettability of the *** the condition of water lubrication,better wettability and water storage promote the formation of water film,effectively improve the lubrication state of the material,and improve its bearing performance.

关键词： Molecular dynamic Water-lubricated bearing Wettability Friction

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Application of Bionic Tribology in Water-Lubricated Bearing:A Review

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Journal of Bionic Engineering 2022年第4期19卷 902-934页

作者： Xuefei Li zhiwei guo Qiren Huang Chengqing Yuan School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan 430063China National Engineering Research Center for Water Transport Safety Reliability Engineering InstituteWuhan 430063China

Water-lubricated bearing has become the development trend in the future because of its economy and environmental *** poor friction performance under low speed and heavy load seriously limits the popularization and application of water-lubricated *** from nature,the phenomenon of low friction and wear in nature has aroused great interest of scientists,and a lot of research has been carried out from mechanism analysis to bionic *** this review,our purpose is to provide guiding methods and analysis basis for the bionic design and theoretical research of anti-friction and anti-wear of water-lubricated *** development of water-lubricated bearing materials are *** typical examples of natural friction reduction and drag reduction are introduced in detail,and several representative preparation methods are ***,the application status of bionic tribology in water-lubricated bearings is summarized,and the future development direction of water-lubricated bearings is prospected.

关键词： Water-lubricated bearing Bionic tribology Bearing material Friction Wear

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Jet formation and penetration performance of a double-layer charge liner with chemically-deposited tungsten as the inner liner

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Defence Technology（防务技术） 2024年第3期33卷 374-385页

作者： Bihui Hong Wenbin Li Yiming Li zhiwei guo Binyou Yan Ministerial Key Laboratory of ZNDY Nanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Xiamen Tungsten Co. Ltd.Xiamen 361004China

This paper proposes a type of double-layer charge liner fabricated using chemical vapor deposition(CVD)that has tungsten as its inner *** feasibility of this design was evaluated through penetration ***-layer charge liners were fabricated by using CVD to deposit tungsten layers on the inner surfaces of pure T2 copper *** microstructures of the tungsten layers were analyzed using a scanning electron microscope(SEM).The feasibility analysis was carried out by pulsed X-rays,slug-retrieval test and static penetration *** shaped charge jet forming and penetration law of inner tungsten-coated double-layer liner were studied by numerical simulation *** results showed that the double-layer liners could form well-shaped *** errors between the X-ray test results and the numerical results were within 11.07%.A slug-retrieval test was found that the retrieved slug was similar to a numerically simulated *** with the traditional pure copper shaped charge jet,the penetration depth of the double-layer shaped charge liner increased by 11.4% and>10.8% *** summary,the test results are good,and the numerical simulation is in good agreement with the test,which verified the feasibility of using the CVD method to fabricate double-layer charge liners with a high-density and high-strength refractory metal as the inner liner.

关键词： Shaped charge Chemical vapor deposition Tungsten Double-layer charge liner X-ray Penetration

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Fabrication of magnetically responsive anti-fouling and easy-cleaning nanofiber membrane and its application for efficient oil-water emulsion separation

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Chinese Journal of Chemical Engineering 2022年第1期35卷 286-293页

作者： Yajie Wang zhiwei guo Yujie Yang Yanxiang Li Qingchun guo Peilin Cui Wangliang Li CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Hebei Lansheng Biotech Co. LtdShijiazhuang 052200China International Medical Service Beijing Tiantan Hospital Affiliated to Capital Medical UniversityChina

The magnetically responsive anti-fouling nanofiber membrane(MRANM)was fabricated for efficient oilwater emulsion separation,which could be cleaned using oscillating magnetic *** was prepared by grafting superparamagnetic Fe_(3)O_(4) nanoparticles onto the surface of electrospun polyacrylonitrile nanofiber membrane(PANM).Compared with PANM,the water contact angle of MRANM decreased from 104°to 0°,indicating that the hydrophilicity of the membrane was significantly *** the emulsions of hexadecane,octane and rapeseed oil,the separation efficiency was 98.04%,96.59%and 92.67%,*** the treatments in oscillating magnetic field,the separation efficiency kept above 95%after 8 times recycling,which indicated that the MRANM had good regenerability and *** as-fabricated membrane with magnetic responsiveness facilitated an effective method for solving the membrane fouling problem during practical applications of separation high viscosity oil-water emulsion.

关键词： Superparamagnetic Nanofiber membrane Anti-fouling Oil-water emulsion Regeneration

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Instabilities and pattern evolution in a vertically heated annulus

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Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 257-262页

作者： WANG BoFu guo zhiwei MA DongJun SUN DeJun Department of Modern Mechanics University of Science and Technology of China School of Water Resources and Hydropower Engineering Wuhan University School of Aerospace Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332USA

The convection in an annular container with heated bottom,cooled top and insulated side walls are studied by both linear instability analysis and direct numerical *** onset of convection is investigated by linear stability analysis and corresponding pattern selection mechanisms are *** nonlinear evolution of different flow patterns and the convective heat transfer are *** transition to oscillatory flow is also given by stability analysis where the base flow is a steady three dimensional *** stability predictions are in good agreement with the numerical simulations,including both the growth rate and the dimensionless frequency.

关键词： thermal convection flow instability pattern evolution

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Intelligent cache and buffer optimization for mobile VR adaptive transmission in 5G edge computing networks

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Digital Communications and Networks 2024年第5期10卷 1234-1244页

作者： Junchao Yang Ali Kashif Bashir zhiwei guo Keping Yu Mohsen Guizani Chongqing Key Laboratory of Intelligent Perception and BlockChain Technology School of Artificial Intelligence Chongqing Technology and Business University Department of Computing and Mathematics Manchester Metropolitan University Woxsen School of Business Woxsen University Department of Computer Science and Mathematics Lebanese American University Graduate School of Science and Engineering Hosei University Machine Learning Department Mohamed Bin Zayed University of Artificial Intelligence (MBZUAI)

Virtual Reality(VR) is a key industry for the development of the digital economy in the *** VR has advantages in terms of mobility,lightweight and cost-effectiveness,which has gradually become the mainstream implementation of *** this paper,a mobile VR video adaptive transmission mechanism based on intelligent caching and hierarchical buffering strategy in Mobile Edge Computing(MEC)-equipped 5G networks is proposed,aiming at the low latency requirements of mobile VR services and flexible buffer management for VR video adaptive *** support VR content proactive caching and intelligent buffer management,users' behavioral similarity and head movement trajectory are jointly used for viewpoint *** tile-based content is proactively cached in the MEC nodes based on the popularity of the VR ***,a hierarchical buffer-based adaptive update algorithm is presented,which jointly considers bandwidth,buffer,and predicted viewpoint status to update the tile chunk in client ***,according to the decomposition of the problem,the buffer update problem is modeled as an optimization problem,and the corresponding solution algorithms are ***,the simulation results show that the adaptive caching algorithm based on 5G intelligent edge and hierarchical buffer strategy can improve the user experience in the case of bandwidth fluctuations,and the proposed viewpoint prediction method can significantly improve the accuracy of viewpoint prediction by 15%.

关键词： Virtual reality Adaptive transmission Edge cache Buffer management 5G Mobile edge computing

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Designing soft/hard double network hydrogel microsphere/UHMWPE composites to promote water lubrication performance

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Friction 2021年第3期9卷 551-568页

作者： Chaobao WANG Xiuqin BAI Conglin DONG zhiwei guo Chengqing YUAN Anne NEVILLE School of Energy and Power Engineering Wuhan University of TechnologyWuhan 430063China Key Laboratory of Marine Power Engineering&Technology(Ministry of Transport) Wuhan University of TechnologyWuhan 430063China Institute of Functional Surfaces School of Mechanical EngineeringUniversity of LeedsLeeds LS29JTUnited Kingdom

Several soft tissues residing in the living body have excellent hydration lubrication properties and can provide effective protection during relative *** order to apply this advantage of soft matters in practical applications and try to avoid its disadvantage,such as swelling and weakening in water,a design strategy of a soft/hard double network(DN)hydrogel microsphere modified ultrahigh molecular weight polyethylene(UHMWPE)composite is proposed in this study.A series of microspheres of urea-formaldehyde(UF),polyacrylamide(PAAm)hydrogel,UF/PAAm double network,and their composites were *** mechanical properties,swelling,wettability,friction properties,and the lubrication mechanisms of the composites were *** results show that DN microspheres can have an excellent stability and provide hydration *** performance of 75 DN-1 composite was superior to *** finding will provide a novel strategy for the development of water-lubricated materials and have wide application in engineering fields.

关键词： double network microsphere composite friction properties hydration lubrication

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Deep learning-based intelligent precise aeration strategy for factory recirculating aquaculture systems

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Artificial Intelligence in Agriculture 2024年第2期12卷 57-71页

作者： Junchao Yang Yuting Zhou zhiwei guo Yueming Zhou Yu Shen School of Artificial Intelligence Chongqing Technology and Business UniversityChongqing 400067China National Research Base of Intelligent Manufacturing Services Chongqing Technology and Business UniversityChongqing 400067China

Factory recirculating aquaculture system(RAS)is facing in a stage of continuous research and technological *** aquaculture is an important direction for the future development of ***,the RAS nowdays still has poor self-learning and optimal decision-making capabilities,which leads to high aqua-culture cost and low running *** this paper,a precise aeration strategy based on deep learning is de-signed for improving the healthy growth of breeding ***,the situation perception driven by computer vision is used to detect the hypoxia *** combined with the biological energy model,it is constructed to calculate the breeding objects oxygen ***,the optimal adaptive aeration strategy is generated according to hypoxia behavior judgement and biological energy *** results show that the energy consumption of proposed precise aeration strategy decreased by 26.3%compared with the man-ual control and 12.8%compared with the threshold ***,stable water quality conditions acceler-ated breeding objects growth,and the breeding cycle with the average weight of 400 g was shortened from 5 to 6 months to 3–4 months.

关键词： Recirculating aquaculture system Precise aeration Deep learning Intelligent control

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A universal non-Hermitian platform for bound state in the continuum enhanced wireless power transfer

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Frontiers of physics 2024年第4期19卷 37-46页

作者： Haiyan Zhang zhiwei guo Yunhui Li Yaping Yang Yuguang Chen Hong Chen School of Physics Science and Engineering Tongji UniversityShanghai 200092China Department of Electrical Engineering Tongji UniversityShanghai 201804China

Non-Hermitian systems with parity–time(PT)-symmetry have been extensively studied and rapidly developed in resonance wireless power transfer(WPT).The WPT system that satisfies PT-symmetry always has real eigenvalues,which promote efficient energy ***,meeting the condition of PT-symmetry is one of the most puzzling *** power transfer under different transmission conditions is also a great *** state in the continuum(BIC)supporting extreme quality-factor mode provides an opportunity for efficient ***,we propose theoretically and demonstrate experimentally that BIC widely exists in resonance-coupled systems without PT-symmetry,and it can even realize more stable and efficient power transfer than PT-symmetric ***,BIC for efficient WPT is universal and suitable in standard second-order and even high-order WPT *** results not only extend non-Hermitian physics beyond PT-symmetry,but also bridge the gap between BIC and practical application engineering,such as highperformance WPT,wireless sensing and communications.

关键词： non-Hermitian physics parity-time asymmetry bound state in the continuum wireless power transfer

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