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International Conference on Electrical Machines and Systems

作者： Yifan DONG Wenzhou LU Yanwei LIU Haiying CHEN School of Internet of Things Engineering Key Laboratory of Advance Process Control for Light Industry (Ministry of Education) Jiangnan University School of Mechanical Engineering Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan University

ISBN: (纸本)9781538661499

In order to optimize the coil design of electric vehicle (EV) high power resonant wireless power transfer (WPT) system and improve its transfer efficiency, an equivalent circuit model of two-coil series-series topology is analyzed in this paper. Four optimal factors that affect the system transfer efficiency are proposed, i.e. the number of coil turns, the mean radius of coils, the transfer distance and the load. Based on the consideration of the equivalent series resistance of the coils, it can be found that the number of coil turns, the mean coil radius, and the load have the optimal values for the optimal transfer efficiency, while the shorter the transfer distance is, the higher the transfer efficiency is. By using the simulation software COMSOL, similar relationships between four factors and the transfer efficiency can be achieved with the calculation results. Moreover, by repeating the calculation using the simulation coil resistance, the differences between the calculation results and the simulation results are explained. Therefore, the WPT coil optimal method with proposed four optimal factors is verified through calculation and simulation.

关键词： High power Resonant Wireless power transfer Coil optimization Equivalent series resistance

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Kinematics control and Analysis of Industrial Robot

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IOP Conference Series: Materials Science and Engineering 2018年第1期320卷

作者： Tongbo Zhu Fan Cai Yongmei Li Wei Liu Minnan university of science and technology Provincial Key Laboratory of industrial robot measurement and controlRapid die manufacturing Quanzhou Fujian 362700China

The robot's development present situation, basic principle and control system are introduced briefly. Research is mainly focused on the study of the robot's kinematics and motion control. The structural analysis of a planar articulated robot (SCARA) robot is presented,the coordinate system is established to obtain the position and orientation matrix of the end effector,a method of robot kinematics analysis based on homogeneous transformation method is proposed, and the kinematics solution of the robot is *** of industrial robot's kinematics equation and formula for positive kinematics by example. Finally,the kinematic analysis of this robot was verified by *** provides a basis for structural design and motion *** has active significance to promote the motion control of industrial robot.

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Effects of Structural Parameters on Hydraulic Performance of Flow Regulator

Effects of Structural Parameters on Hydraulic Performance of...

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CSAA/IET International Conference on Aircraft Utility Systems

作者： Yong Li Xuemei Zong Xiaoming Yuan Shiyi Zhao State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery and Jiangsu Xuzhou Construction Machinery Research Institute Xuzhou Construction Machinery Group Co. Ltd Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control and with the Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University

ISBN: (纸本)9781510872745

In order to evaluate the hydraulic performance of a regulator, the pressure loss and the stabilization performance of the regulator installed in the fire water monitor were introduced. The effects of structures on a regulator were investigated by the structural model made in UG and the flow simulation conducted in ANSYS. The hydraulic performance of a star-shaped regulator was analyzed with different structure parameters, such as the blade number, axial length and rounded-corner. The effects of structure parameters on the regulator were revealed, based on which the hydraulic performance of the improved regulator with different blade numbers was analyzed. The results show that the improved regulator with two cross-sections in dislocation and six even-distributed blades has the better hydraulic performance. The preliminary experimental results show that the improved regulator can improve the jet range of a fire water monitor.

关键词： Fire water monitor Hydraulic performance Regulator Flow simulation

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Operation Mode Study in Cloud manufacturing Ecosystem

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Procedia CIRP 2017年 61卷 347-352页

作者： Shengkai Chen Shuiliang Fang Tao Peng Renzhong Tang Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province College of Mechanical Engineering Zhejiang University Hangzhou 310027 China The State Key Laboratory of Fluid Power Transmission and Control College of Mechanical Engineering Zhejiang University Hangzhou 310027 China

With cloud manufacturing and its shared big-data, the life-cycle management of the massive distributed manufacturing resources can be considered as an ecosystem, in which every entity makes their own decisions depend on the enriched information, which will affect the life cycle of the resources and the overall industry states. In this paper, an original operation mode with three extensions are proposed to describe the life cycle vicissitude of each resource. An agent-based model was designed to simulate the ecosystem modes from the very beginning, and the results show that the ecosystem has: 1) shorter job queue length and lower resource idle rate with incubation mode; 2) a little shorter job queue length and fewer amount of registered resource with outsourcing mode; 3) the fewest amount of registered resource but a little higher resource idle rate with metabolism mode.

关键词： Cloud manufacturing ecosystem decision-making operation mode ecosystem evolution agent-based simulation

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The Influence of Scanning Pattern on the Part Properties in Powder Bed Fusion Processes: An Experimental Study

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Procedia CIRP 2017年 61卷 606-611页

作者： Hong Zhang Tao Peng Shuangmei Xu The State Key Lab of Fluid Power Transmission and Control Industrial Engineering Center College of Mechanical Engineering Zhejiang University Hangzhou 310027 China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province Hangzhou 310027 China

Many parameters in a laser based powder bed fusion process affect the part property. In this research, experiments were designed to study how scanning pattern affects the properties of printed 17-4 PH stainless steel parts. Five different representative scanning patterns were adopted. Micro hardness, density and energy consumption values of the sample parts were analyzed. Micro hardness was evenly distributed, and above the standard hardness value. Hardness in cross section is generally higher than that in vertical section. Density of parts in concentric line pattern is the lowest, and continuous mesh is the highest. Using continuous mesh, it consumed more energy than others.

关键词： laser based powder bed fusion scanning pattern micro hardness density energy consumption.

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Realization of Fiber Optic Gyro Modulation and Demodulation control System Based on FPGA

Realization of Fiber Optic Gyro Modulation and Demodulation ...

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2017 5th International Conference on Mechanical, Automotive and Materials Engineering（CMAME 2017）

作者： Chao Liao Jinbin Luo Li Liu Chengxiang Liu Guangdong Provincial Key Laboratory of Mico/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen University Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes

Based on Altera company’s Cyclone Ⅱ series EP2 C8 Q208 C8 chip,the circuit board and control algorithm program is designed to achieve a complete modulation and demodulation control *** system can output triangular wave and the triangular wave can be used to modulate the original *** the system can demodulate the modulated input ***,the system is controlled by PID according to the difference between the actual demodulation signal and the ideal ***’s more,this paper also discusses how to use the incremental PID algorithm to realize the locking of the resonant frequency.

关键词： modulation demodulation FPGA

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Quadratic contact point semimetal: Theory and material realization

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Physical Review B 2018年第12期98卷 125104-125104页

作者： Ziming Zhu Ying Liu Zhi-Ming Yu Shan-Shan Wang Y. X. Zhao Yuanping Feng Xian-Lei Sheng Shengyuan A. Yang Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore 487372 Singapore Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Physics National University of Singapore Singapore 117542 Singapore Department of Physics Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education) Beihang University Beijing 100191 China Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing 210023 China

Most electronic properties of metals are determined solely by the low-energy states around the Fermi level and, for topological metals/semimetals, these low-energy states become distinct because of their unusual energy dispersion and emergent pseudospin degree of freedom. Here, we propose a class of materials which are termed as quadratic contact point (QCP) semimetals. In these materials, the conduction and valence bands contact at isolated points in the Brillouin zone, around which the band dispersions are quadratic along all three directions. We show that in the absence/presence of spin-orbit coupling, there may exist triply/quadruply degenerate QCPs that are protected by the crystalline symmetry. We construct effective models to characterize the low-energy fermions near these QCPs. Under strong magnetic field, unlike the usual 3D electron gas, there appear unconventional features in the Landau spectrum. The QCP semimetal phase is adjacent to a variety of topological phases. For example, by breaking symmetries via Zeeman field or lattice strain, it can be transformed into a Weyl semimetal with Weyl and double Weyl points, a Z2 topological insulator/metal, or a Dirac semimetal. Via first-principles calculations, we identify realistic materials Cu2Se and RhAs3 as candidates for QCP semimetals.

关键词： First-principles calculations Topological materials 3-dimensional systems Density functional theory Wannier function methods k dot p method

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Suppressing the relative linewidth of a dual-comb system without using ultra-stable CW lasers

Suppressing the relative linewidth of a dual-comb system wit...

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Conference on Lasers and Electro-Optics Pacific Rim

作者： Zebin Zhu Kai Ni Qian Zhou Guanhao Wu State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing 100084 China Division of Advanced Manufacturing Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China

We use an intra-cavity EOM to realize high speed synchronization of two combs. The out-of-loop relative linewidth is dramatically suppressed from 300kHz to sub-hertz without using an ultra-stable CW laser as a reference.

ISBN: (纸本)9781509062904

关键词： Continuous wave operation Frequency combs Lasers Linewidth Michelson interferometers Ultrashort pulses

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Effect of CA mortar disengagement on Dynamic characteristics of Slab Ballastless Track on Subgrade

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IOP Conference Series: Materials Science and Engineering 2018年第2期452卷

作者： Hui Shi Liqiang Zhu Hongmei Shi Zujun Yu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control Technology (Beijing Jiaotong University) Ministry of Education Beijing 100044 China

According to the improved model of the vehicle-ballastless slab track-subgrade coupling system, the effects of cement asphalt mortar (CA) disengagement on dynamic characteristics of vehicle and track are analysed. The results show that when the CA mortar longitudinal disengagement length exceeds 0.65m and the horizontal disengagement degree exceeds 0.5, the maximum and minimum of wheel-rail force, the maximum of the displacement of track system change obviously with the increase of CA mortar disengagement length. The effect of CA mortar disengagement on track system is larger than the vehicle system. The CA mortar disengagement should be repaired timely.

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MPC based optimal path-tracking control strategy for 4WS4WD vehicles

MPC based optimal path-tracking control strategy for 4WS4WD ...

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Annual Conference of Industrial Electronics Society

作者： Qifan Tan Lijing Dong Hao Yan Beijing Jiaotong University Beijing Beijing CN Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control Technology Ministry of Education Beijing China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing China

This paper presents a fully dynamic model based control algorithm for the path tracking of four-wheel-steer four-wheel-drive (4WS4WD) vehicle. The modeling of 4WS4WD vehicle indicates that the vehicle has a higher control flexibility which can provide a better performance in overcoming the force disturbances from the ground. By combining the model predictive control (MPC) and control allocation, the over-actuated system is decoupled and the accurate path tracking is achieved. Simulation results are provided to validate the proposed methodology.

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