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Structure evolution,dielectric,and conductivity behavior of(K_(0.5)Na_(0.5))NbO_(3)-Bi(Zn_(2/3)Nb_(1/3))O_(3) ceramics

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Journal of Advanced Ceramics 2021年第4期10卷 809-819页

作者： Tianxiang YAN Kaiyuan CHEN Chengqi LI Min LIU Jie WANG Liang FANG Laijun LIU College of Mechanical and Control Engineering&College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004China Institute of Fluid Engineering Equipment Jiangsu Industrial Technology Research InstituteJiangsu UniversityZhenjiang 212013China Key Laboratory for RF Circuits and Systems Ministry of Education&Key Laboratory of Large Scale Integrated DesignHangzhou Dianzi UniversityHangzhou 310018China

(1-x)K_(0.5)Na_(0.5)Nb0_(3-x)Bi(Zn_(2/3)Nb_(1/3))0_(3)((1-x)KNN-xBZN,x=0.010,0.015,0.020,0.025,and 0.030)lead-free ceramics were fabricated via a traditional solid-state *** crystal structure,microstructure,dielectric,and conductivity behavior of this system were *** with X-ray diffraction(XRD)patterns,Rietveld refinement,and dielectric spectroscopy,an orthorhombic phase was determined for x=0.010,an orthorhombic-tetragonal mixed phase was identified for x=0.015,and a rhombohedral symmetry appears in 0.020≤x≤*** 0.98KNN-0.02BZN and 0.975KNN-0.025BZN ceramics exhibit stable permittivity and low dielectric loss tangent(tan)in wide temperature ranges owing to the combination of rhombohedral-tetragonal step-like feature and the diffuse phase transition from tetragonal to *** activation energies of dielectric relaxation and conductivity behavior at high temperatures initially decrease slightly,then drop sharply,and finally decline slowly,which could be attributed to microstructure morphologies and the concentration of oxygen vacancies.

关键词： ceramic crystal structure dielectric spectroscopy oxygen vacancies

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Machinability of damage-tolerant titanium alloy in orthogonal turn-milling

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Frontiers of Mechanical engineering 2020年第3期15卷 504-515页

作者： Tao SUN Lufang QIN Junming HOU Yucan FU Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control Xuzhou University of TechnologyXuzhou 221111China Industrial Center Nanjing Institute of TechnologyNanjing 211167China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The damage-tolerant titanium alloy TC21 is used extensively in important parts of advanced aircraft because of its high strength and durability. However, cutting TC21 entails problems, such as high cutting temperature, high tool tip stress, rapid tool wear, and difficulty guaranteeing processing quality. Orthogonal turn-milling can be used to solve these problems. In this study, the machinability of TC21 in orthogonal turn-milling is investigated experimentally to optimize the cutting parameters of orthogonal turn-milling and improve the machining efficiency, tool life, and machining quality of TC21. The mechanism of the effect of turn-milling parameters on tool life is discussed, the relationship between each parameter and tool life is analyzed, and the failure process of a TiAlN-coated tool in turn-milling is explored. Experiments are conducted on the integrity of the machined surface (surface roughness, metallographic structure, and work hardening) by turn-milling, and how the parameters influence such integrity is analyzed. Then, reasonable cutting parameters for TC21 in orthogonal turn-milling are recommended. This study provides strong guidance for exploring the machinability of difficult-to-cut-materials in orthogonal turn-milling and improves the applicability of orthogonal turn-milling for such materials.

关键词： orthogonal turn-milling damage-tolerant titanium alloy tool life and failure machined surface integrity machinability

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Design and Dynamic Analysis of the Gear Contact Fatigue Testing Machine

Design and Dynamic Analysis of the Gear Contact Fatigue Test...

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2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation, AMIMA 2018

作者： Wang, Ju Lin, Chaowen Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control Xuzhou Institute of Technology Xuzhou221111 China School of Mechanical and Electrical Engineering Xuzhou Institute of Technology Xuzhou221111 China

For gear contact fatigue testing, a new gear contact fatigue testing machine structural based on closed mechanical power-flow was proposed and the structural model was established. A set of power balance of the system was given according to theoretical calculation and mathematical deduction of the system transmission efficiency. In addition, statics and dynamics simulation analysis of the power transmission circuit was carried out, and the structural strength and stability under normal operating frequency was checked. The simulation results showed that the design and theoretical calculations had been confirmed. © Published under licence by IOP Publishing Ltd.

关键词： Fatigue testing

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Research and Development of the IoT Intelligent Operation System in Concrete Products

Research and Development of the IoT Intelligent Operation Sy...

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International Conference on Mechanical, control and Computer engineering (ICMCCE)

作者： Renli Wang En Fang Shuyun Qiao Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control Xuzhou China

In view of the management, economy and transportation confusion and waste caused by incomplete communication facilities and low information exchange rate in concrete transportation, the research and design of concrete transportation based on Internet of Things (IoT) system was proposed. The on-board weighing detection technology and the key technology of the truck terminal are realized. And the system can realized real-time monitoring of operation status, truck intelligent identification, optimized driving path, on-board automatic weighing, delivery scheduling and management services. The system significantly improves operational efficiency and reduces production cost.

关键词： Handheld computers System analysis and design Conferences Loading

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An intelligent fault diagnosis method for rotating machinery based on genetic algorithm and classifier ensemble 29

An intelligent fault diagnosis method for rotating machinery...

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第29届中国控制与决策会议

作者： Dongyang Dou Bin Xue Min He Jian Jiang School of Chemical Engineering and Technology China University of Mining and Technology Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control Xuzhou Institute of Technology

ISBN: (纸本)9781509046584

On the basis of extracting six time-domain features and five frequency-domain ones from vibration signals processed by empirical mode decomposition, an intelligent method to construct a rule-based classifier ensemble for fault diagnosis of rolling bearings was presented. The candidate reducts which could be used to build the base classifiers were found by applying a genetic algorithm for feature reduction on the decision table, and then the other genetic algorithm for diversity evaluation was used to search an optimal ensemble of base classifiers. Based on the results above and the improved weighted voting strategy, the final classifier ensemble for fault recognition could be set up. It was proved by the diagnosis experiment including normal condition, inner race fault, outer race fault and rolling element fault of SKF 6203 bearings that the method proposed in this paper was valid due to the satisfactory accuracy of classification.

关键词： Fault diagnosis Classifier ensemble Rolling bearing Genetic algorithm Rule

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Effects of impact energy on the wear resistance and work hardening mechanism of medium manganese austenitic steel

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Friction 2017年第4期5卷 447-454页

作者： Hui CHEN Dong ZHAO Qingliang WANG Yinghuai QIANG Jianwei QI School of Materials Science and Engineering China University of Mining & TechnologyXuzhou 221116ChinaJiangsu Key Laboratory of Large Engineering Equipment Detection and ControlXuzhou Institute of TechnologyXuzhou 221111China School of Materials Science and Engineering China University of Mining & TechnologyXuzhou 221116China

Medium manganese austenitic steel (MMAS) fabricated through the hot rolling process has been used in the mining,military,and mechanical *** this paper,the abrasion performance and hardening mechanism were measured under a series of impact *** impact wear was tested at different impact energies from 0.5 J to 6 J using a dynamic load abrasive wear tester (MLD-10).Microstructure and surface morphologies were analyzed using scanning electron microscopy,X-Ray diffraction,and transmission electron *** results suggest that MMSA has the best wear resistance at 3.5 J and the worst wear resistance at 1.5 ***,the wear mechanism and worn surface microstructure change with different impact *** are small differences between a large amount of martensite on the worn surfaces under different impact energies and the shapes of dislocation and twins change with different impact energies.

关键词： medium manganese steel impact abrasion wear work hardening twin martensite dislocation

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Small Snow Sweeper Design Based on Man-Machine engineering

Small Snow Sweeper Design Based on Man-Machine Engineering

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The 2nd International Conference on Automatic control and Information engineering(ICACIE 2017）

作者： Xingyu Li Lili Liu Lijuan Yang Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control Xuzhou Institute of Technology

ISBN: (纸本)9781510849563

Based on the current development of small snow sweeper on the market, the paper takes man-machine engineering and the shortcomings and problems of current small snow sweeper as the starting point to design a small snow sweeper, which not only can make multi-function conversion, but also add more humanized design concepts, so as to become more convenient for people to use and meet different needs and environment, achieving the perfect unification of appearance and function.

关键词： Small snow sweeper Appearance design humanized

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The Innovation of The Small Reconnaissance UAV Based on the Man-machine engineering Machine Design

The Innovation of The Small Reconnaissance UAV Based on the ...

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The 2nd International Conference on Automatic control and Information engineering(ICACIE 2017）

作者： Weiqun Cao Lili Liu Jiaming Xue Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control Xuzhou Institute of Technology

ISBN: (纸本)9781510849563

With the development of science and technology, the science and technology used in military investigation and surveying and mapping are becoming more and more advanced, and small reconnaissance UAV gradually walked into people's lives. This paper mainly aimed at the improved design of the existing reconnaissance robots. It has improved the aesthetics and practicability of the small detection machine from the aspects of material, appearance, form, working method and manmachine interaction. The small surveillance aircraft can be used both on land and in the air, thus satisfying multi-disciplinary and multi-form work requirements.

关键词： human factors engineering innovation scout plane man-machine

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Analysis of micro-elastohydrodynamic lubrication of the fractal surface

Boletin Tecnico/Technical Bulletin

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Boletin Tecnico/Technical Bulletin 2017年第2期55卷 20-26页

作者： Han, Xiang College of Mechatronic Engineering China University of Mining and Technology Xuzhou Jiangsu221116 China Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control Xuzhou Institute of Technology Xuzhou Jiangsu221018 China

The hydrodynamic lubrication film thickness equation of related fractal characteristics of the rough surface was established. Based on EHL, behavior law by which fractal characteristic parameters affect the pressure, film thickness and friction coefficient of the line contact friction pair was studied through numerical simulation. The results show that, compared with the smooth surface, EHL film thickness curve and pressure curve of the fractal surface are not smooth, and each asperity produces a partial pressure peak within the main load area and the maximum pressure peak value increases with the increase of the scale factor, and decreases with the increase of fractal dimension. The minimum oil film thickness decreases with the increase of the scale factor, and increases with the increase of the fractal dimension. When the fractal surface is textured by the spherical pits, the minimum oil film thickness decreases with the increase of the texture depth, and decreases with the increase of the texture diameter. The maximum pressure increases with the increase of the texture depth and diameter. The friction coefficient increases with the increase of the texture depth, and increases with the increase of the texture diameter.

关键词： Fractal dimension

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Design and Dynamic Analysis of The Gear Contact Fatigue Testing Machine

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IOP Conference Series: Materials Science and engineering 2018年第4期382卷

作者： Ju Wang Chaowen Lin Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control Xuzhou Institute of Technology Xuzhou 221111 China School of Mechanical and Electrical Engineering Xuzhou Institute of Technology Xuzhou 221111 China

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