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Impact of lubricant traction coefficient on cage's dynamic characteristics in high-speed angular contact ball bearing

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Chinese Journal of Aeronautics 2017年第2期30卷 827-835页

作者： Zhang Wenhu Deng Sier Chen Guoding Cui Yongcun School of Mechatronics Engineering Northwestern Polytechnical University Xi'an 710071 China School of Mechatronics Engineering Henan University of Science and Technology Luoyang 471003 China collaborative innovation center of major machine manufacturing in liaoning Dalian 116024 China

In this paper,the formulas of elasto-hydrodynamic traction coefficients of three Chinese aviation lubricating oils,4109,4106 and 4050,were obtained by a great number of elastohydrodynamic traction *** nonlinear dynamics differential equations of high-speed angular contact ball bearing were built on the basis of dynamic theory of rolling bearings and solved by Gear Stiff（GSTIFF） integer algorithm with variable *** impact of lubricant traction coefficient on cage＇s dynamic characteristics in high-speed angular contact ball bearing was investigated,and Poincare map was used to analyze the impact of three types of aviation lubricating oils on the dynamic response of cage＇s mass *** then,the period of dynamic response of cage＇s mass center and the slip ratio of cage were used to assess the stability of cage under various working *** results of this paper provide the theoretical basis for the selection and application of aviation lubricating oil.

关键词： Dynamic characteristic High-speed angular contact ball bearing Lubricant traction coefficient Poincare map Stability

Understanding and design of metallic alloys guided by phase-field simulations

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npj Computational Materials 2023年第1期9卷 1377-1401页

作者： Yuhong Zhao Beijing Advanced innovation center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083PR China School of Materials Science and Engineering Collaborative Innovation Center of Ministry of Education for High-performance Al and Mg Alloy MaterialsNorth University of ChinaTaiyuan 030051PR China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004PR China

Phase-field method(PFM)has become a mainstream computational method for predicting the evolution of nano and mesoscopic microstructures and properties during materials *** paper briefly reviews latest progresses in applying PFM to understanding the thermodynamic driving forces and mechanisms underlying microstructure evolution in metallic materials and related processes,including casting,aging,deformation,additive manufacturing,and defects,*** on designing alloys by integrating PFM with constitutive relations and machine *** examples are presented to demonstrate the potential of integrated PFM in discovering new multi-scale phenomena and high-performance *** article ends with prospects for promising research directions.

关键词： alloys microstructure metallic

Prediction of mechanical properties for deep drawing steel by deep learning

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 156-165页

作者： Gang Xu Jinshan He Zhimin Lü Min Li Jinwu Xu collaborative innovation center of Steel Technology University of Science and Technology BeijingBeijing 100083China Suzhou Baolian Heavy Industry Co. Suzhou 215131China

At present,iron and steel enterprises mainly use“after spot test ward”to control final product ***,it is impossible to realize on-line quality predetermining for all products by this traditional approach,hence claims and returns often occur,resulting in major eco-nomic losses of *** order to realize the on-line quality predetermining for steel products during manufacturing process,the predic-tion models of mechanical properties based on deep learning have been proposed in this ***,the mechanical properties of deep drawing steels were predicted by using LSTM(long short team memory),GRU(gated recurrent unit)network,and GPR(Gaussian process regression)model,and prediction accuracy and learning efficiency for different models were also ***,on-line re-learning methods for transfer learning models and model parameters were *** experimental results show that not only the prediction accuracy of optimized trans-fer learning models has been improved,but also predetermining time was shortened to meet real time requirements of on-line property *** industrial production data of interstitial-free(IF)steel was used to demonstrate that R2 value of GRU model in training stage reaches more than 0.99,and R2 value in testing stage is more than 0.96.

关键词： machine learning recurrent natural network transfer learning on-line prediction deep drawing steel mechanical properties

Cage slip characteristics of a cylindrical roller bearing with a trilobe-raceway

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Chinese Journal of Aeronautics 2018年第2期31卷 351-362页

作者： Sier DENG Yujia LU Wenhu ZHANG Xue SUN Zhenwei LU School of Mechanical Engineering Henan University of Science and Technology Luoyang 471003 China collaborative innovation center of major machine manufacturing in liaoning Dalian 116024 China Patent Examination Cooperation center of the Patent Office SIPO Henan Zhengzhou 450002 China School of Mechanical Engineering Northwestern Polytechnical University Xi'an 710071 China Technology center of LUO YANG L YC BEARING CO. LTD Luoyang 471003 China

Based on dynamic analysis of rolling bearings, the nonlinear dynamic differential equations of a cylindrical roller bearing with a trilobe-raceway were established and solved by the GSTIFF（gear stiff） integer algorithm with a variable step. The influences of structural parameters and the tolerance of the trilobe-raceway, working conditions of the bearing, and the outer ring installation method on cage slip characteristics were investigated. The results show that：（i） The cage slip ratio and bearing rating life of a cylindrical roller bearing with a trilobe-raceway would reduce when the low-radius（radius of the outer raceway contour at the lowest point） and D-value（difference value between the high and low points of the outer raceway contour） decrease, and the former（low-radius） contributes more significantly.（ii） The cage slip ratio of a cylindrical roller bearing with a trilobe-raceway rises with the increase of the bearing speed, and decreases with the increase of the radial force; the variation range increases with the increase of the low-radius.（iii） When the installation angle of the outer ring increases in a period, the cage slip ratio remains unchanged while the bearing rating life rises up a little. Therefore, when installing a cylindrical roller bearing with a trilobe-raceway, the location of the maximum radius shall be under that of the radial force to improve the bearing rating life.（iv） With the increase of the roundness of the base circle where the radius of the lowest points of the trilobe-raceway contour locates, the cage slip ratio rises gradually and the bearing rating life decreases.

关键词： Bearing rating life Cage slip ratio Dynamics Raceway contour Trilobe-raceway

Effect of boron addition on microstructure and mechanical properties of an additively manufactured superalloy

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Journal of Iron and Steel Research(International) 2023年第3期30卷 601-609页

作者： Rui Wang Dao-hong Wang Peng Zhang Zhi-qing Yang Jing-jing Liang Jin-guo Li Shi-Changxu innovation center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026AnhuiChina Jiang Su Feiyue machine and Pump Group Co. Ltd.Jingjiang 225300JiangsuChina

The effect of boron addition(0.010,0.015,and 0.020 wt.%)on the microstructure and mechanical properties of an additively manufactured superalloy was *** as-built microstructure was investigated by scanning electron microscopy and transmission electron *** results demonstrate that boron precipitates as M_(3)B_(2)boride at the grain *** increase in boron content increases the amount ofγ/γ′eutectic and the size and fraction of M_(3)B_(2)*** creates nanoscale fine borides at grain boundaries,which significantly reinforces grain *** mechanical property analysis indicated that the addition of boron improved the tensile ductility at 760℃and stress rupture properties at 760℃/780 ***,with the excessive addition of boron,the mechanical property was reduced.

关键词： Additive manufacturing Superalloy Boron Grain boundary Stress rupture Tension

A novel approach of deposition for uniform diamond films on circular saw blades

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Plasma Science and Technology 2017年第11期19卷 48-58页

作者：周红秀袁伯雅吕继磊江南 School of Energy and Power Engineering Dalian University of TechnologyDalian 116024People's Republic of China collaborative innovation center of major machine manufacturing in liaoning Dalian University of TechnologyDalian 116024People's Republic of China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201People's Republic of China

Uniform diamond films are highly desirable for cutting industries, due to their high performance and long lifetime used on cutting tools. Nevertheless, they are difficult to obtain on cutting tools with complicated shapes, greatly limiting the applications of diamond films. In this study, a novel approach of deposition for uniform diamond films is proposed, on circular saw blades made of cemented carbide using reflectors of brass sheets. Diamond films are deposited using hot filament chemical vapor deposition（HFCVD）. A novel concave structure of brass sheets is designed and fabricated, improving the distribution of temperature field, and overcoming the disadvantages of the conventional HFCVD systems. This increases the energy efficiency of use without changing the structure and increasing the cost of HFCVD. The grains are refined and the intensities of diamond peaks are strengthened obviously, which is confirmed by scanning electron microscopy and Raman spectra respectively.

关键词： diamond film Raman scanning electron microscopy HFCVD reflectors

Application of the Modified nverse Design Method in the Optimization of the Runner Blade of a Mixed-Flow Pump

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Chinese Journal of Mechanical Engineering 2018年第6期31卷 137-153页

作者： Ye-Ming Lu Xiao-Fang Wang Wei Wang Fang-Ming Zhou School of Energy and Power Engineering Dalian University of TechnologyDalian 116000China Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of TechnologyDalian 116000China collaborative innovation center of major machine manufacturing in liaoning Province Dalian 116000China

To improve the design speed and reduce the design cost for the previous blade design method, a modified inverse design method is presented. In the new method, after a series of physical and mathematical simplifications, a sail?like constrained area is proposed, which can be used to configure di erent runner blade shapes. Then, the new method is applied to redesign and optimize the runner blade of the scale core component of the 1400?MW canned nuclear coolant pump in an established multi?optimization system compromising the Computational Fluid Dynamics(CFD) analysis, the Response Surface Methodology(RSM) and the Non?dominated Sorting Genetic Algorithm?II(NSGA?II). After the execution of the optimization procedure, three optimal samples were ultimately obtained. Then, through comparative analysis using the target runner blade, it was found that the maximum e ciency improvement reached 1.6%, while the head improvement was about 10%. Overall, a promising runner blade inverse design method which will benefit the hydraulic design of the mixed?flow pump has been proposed.

关键词： Optimization Mixed?flow pump Inverse design method Runner blade Nuclear coolant

Roadmap for rechargeable batteries:present and beyond

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Science China Chemistry 2024年第1期67卷 13-42页

作者： Sen Xin Xu Zhang Lin Wang Haijun Yu Xin Chang Yu-Ming Zhao Qinghai Meng Pan Xu Chen-Zi Zhao Jiahang Chen Huichao Lu Xirui Kong Jiulin Wang Kai Chen Gang Huang Xinbo Zhang Yu Su Yao Xiao Shu-Lei Chou Shilin Zhang Zaiping Guo Aobing Du Guanglei Cui Gaojing Yang Qing Zhao Liubing Dong Dong Zhou Feiyu Kang Hu Hong Chunyi Zhi Zhizhang Yuan Xianfeng Li Yifei Mo Yizhou Zhu Dongfang Yu Xincheng Lei Jianxiong Zhao Jiayi Wang Dong Su Yu-Guo Guo Qiang Zhang Jun Chen Li-Jun Wan CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences.Beijing 100049 China Institute of Advanced Battery Materials and Devices Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationBeijing University of TechnologyBeijing 100124China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Chemistry and Utilization of Carbon-Based Energy Resources College of ChemistryXinjiang UniversityUrumqi 830046China Department of Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChangchun 130022China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaide 5000Australia Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Frontiers Science center for New Organic Matter Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China College of Chemistry and Materials Science Jinan UniversityGuangzhou 511443China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Division of Energy Storage Dalian National Laboratory for Clean Energy(DNL)Dalian Institute of Chem

Rechargeable batteries currently hold the largest share of the electrochemical energy storage market,and they play a major role in the sustainable energy transition and industrial decarbonization to respond to global climate *** to the increased popularity of consumer electronics and electric vehicles,lithium-ion batteries have quickly become the most successful rechargeable batteries in the past three decades,yet growing demands in diversified application scenarios call for new types of rechargeable *** efforts are made to developing the next-generation post-Li-ion rechargeable batteries,which include,but are not limited to solid-state batteries,lithium–sulfur batteries,sodium-/potassium-ion batteries,organic batteries,magnesium-/zinc-ion batteries,aqueous batteries and flow *** the great achievements,challenges persist in precise understandings about the electrochemical reaction and charge transfer process,and optimal design of key materials and interfaces in a *** roadmap tends to provide an overview about the current research progress,key challenges and future prospects of various types of rechargeable *** computational methods for materials development,and characterization techniques will also be discussed as they play an important role in battery research.

关键词： energy storage rechargeable batteries battery materials electrochemistry

Enhanced tribological properties of aligned graphene-epoxy composites

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Friction 2022年第6期10卷 854-865页

作者： Yuefeng DU Zhenyu ZHANG Dong WANG Lezhen ZHANG Junfeng CUI Yapeng CHEN Mingliang WU Ruiyang KANG Yunxiang LU Jinhong YU Nan JIANG Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China Beijing Spacecrafts manufacturing Factory Co. Ltd.China Academy of Space TechnologyBeijing 100094China Weichai Power Co. Ltd.Weifang 261061China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of SciencesNingbo 315201China

The random distribution of graphene in epoxy matrix hinders the further applications of grapheneepoxy composites in the field of ***,in order to fully utilize the anisotropic properties of graphene,highly aligned graphene-epoxy composites(AGEC)with horizontally oriented structure have been fabricated via an improved vacuum filtration freeze-drying *** frictional tests results indicated that the wear rate of AGEC slowly increased from 5.19x10^(-6)mm^(3)/(N-m)to 2.87x10^(-5)mm^(3)/(N-m)with the increasing of the normal load from 2 to 10 N,whereas the friction coefficient(COF)remained a constant of *** to the neat epoxy and random graphene-epoxy composites(RGEC),the COF of AGEC was reduced by 87.5%and 71.2%,and the reduction of wear rate was 86.6%and 85.4%at most,*** electron microscope(SEM)observations illustrated that a compact graphene self-lubricant film was formed on the worn surface of AGEC,which enables AGEC to possess excellent tribological ***,in light of the excellent tribological properties of AGEC,this study highlights a pathway to expand the tribological applications of graphene-epoxy composites.

关键词： graphene aligned epoxy composite tribological performance