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Study on Parallel Scheduling of LED Dies Measurement and Grading

Study on Parallel Scheduling of LED Dies Measurement and Gra...

2010 11th International Conference on Electronic Packaging Technology & High Density Packaging(2010 电子封装技术与高密度封装国际会议)

作者： Tao Wu Bin Li Longwen Wang Kanghua Lin National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan430074

The light-emitting diode (LED) is the world's most efficient light source being mass produced today. However, the packaging cost is relatively high, which has been the main factor restricting widespread application of LED lighting. As the LED industry becomes prosperous, short time consumption for single die measurement is particularly concerned by semiconductor manufacturers. Parallel scheduling methods used for speed improvement are put forward. Focusing on the cooperation between tester and prober, techniques on command flow communication between up station and motion control board, simultaneous control of X/Y driven shafts and up driven dovetails, parallel scheduling between testing process and positioning process are discussed in detail. Using these methods, average speed of measurement is improved from 2.5 LED dies per second to 5.2 LED dies per second. With experimental results, it is proved effective and efficient for proposed system. Such method is available for all similar equipments.

关键词： LED chip measurement parallel scheduling time consumption.

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Study on Automatic Angle Correction Directed by Machine Vision in Power LED Dies Sorting

Study on Automatic Angle Correction Directed by Machine Visi...

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2010 11th International Conference on Electronic Packaging Technology & High Density Packaging(2010 电子封装技术与高密度封装国际会议)

作者： Tao Wu Longwen Wang Kanghua Lin National Numerical Control System Engineering Research Center Huazhong University of Science and TechnologyWuhan430074 DG-HUST Manufacturing Engineering Institute

All dies are required to keep consistent angles in LED chip sorting. Generally, all chips are adhesive to wafer tape. When each die rotates, all other dies rotate and their positions change. To solve this problem, an on-line angle correction method is put forward. Techniques including reverse computing angle offset and moving displacement for die angle correction are discussed in detail. While, experimental results disclose that it is not enough for power LED die angle correction. Active visual rectification is then used for this. In this way, each correction is done by machine vision detects. Experimental results show that many deficiencies are eliminated and maximum value of die angle declination can be corrected to less than 1.25°. It can be concluded that final effects for angle correction has been better.

关键词： LED active visual rectification pre-correction.

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Synchronization control of biaxial electric coordination

Synchronization control of biaxial electric coordination

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International Conference on Computer and Automation engineering, ICCAE

作者： Wangyong He Xiaoqi Tang Liu Yang National Numerical Control System Engineering Research Center HuaZhong University of Science and Technology WuHan People's Republic of China Faculty of Mechanical & Electronic Information China University of Geosciences Wuhan People's Republic of China

With the aim of improving the performance of biaxial electric coordination, in this paper, a new synchronization control method is proposed. The effectiveness of the proposed method is examined by simulation and experiments on a machine tool controlled by a CNC system based on fieldbus servo driver. The experimental results show that synchronization error is decreased obviously in the adopted method.

关键词： Servomotors Servomechanisms Fasteners Machine tools Motion control Computer numerical control Proportional control Equations Programmable control Adaptive control

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A modular numerical control system based on embedded technology

A modular numerical control system based on embedded technol...

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2009 International Conference on Computational Intelligence and Software engineering, CiSE 2009

作者： Li, Zhengyi Tang, Xiaoqi Zhou, Xiangdong State Engineering Research Center of Numerical Control System School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781424445073

This paper proposes a novel architecture of the numerical control (NC) system based on multiprocessor and real-time Ethernet. To comply with the trend of modular, open framework NC system, the hardware architecture is composed of ARM, DSP and FPGA modules, of which the ARM module is responsible for HMI (Human-Machine Interface), the DSP module is in charge of core calculation, and the FPGA module plays the role of logical operation and constructs a real-time Ethernet for integrating servo drive modules, machine input/output units into the system. The proposed NC system has the advantages of smart reconfiguration, high performance but low cost. Finally, successful utilization of this system for a hoop bending machine control is briefly described. ©2009 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Third-order trajectory planning for high accuracy point-topoint motion

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Frontiers of Electrical and Electronic engineering in China 2009年第1期4卷 83-87页

作者： Haihua MU Yunfei ZHOU Sijie YAN Aiguo HAN National Numerical Control System Engineering and Technology Research Center Huazhong University of Science and TechnologyWuhan 430074China

This article studies a third-order trajectory planning method for point-to-point *** available instances for third-order trajectory planning are first *** distinguish those,three criteria are presented relying on trajectory *** that,a fast preprocessing approach considering the trajectory as a whole is given based on the criteria constructed and system ***,the time-optimality of the trajectory is *** relevant formulas are derived with the combination of geometrical symmetry of trajectory and area *** a result,an accurate algorithm and its implementation procedure are *** experimental results show the effectiveness and precision of the proposed *** presented algorithm has been applied in semiconductor manufacturing equipment successfully.

关键词： trajectory planning point-to-point motion limitation criteria

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A Modular numerical control system Based on Embedded Technology

A Modular Numerical Control System Based on Embedded Technol...

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International Conference on Computational Intelligence and Software engineering (CiSE)

作者： Zhengyi Li Xiaoqi Tang Xiangdong Zhou State Engineering Research Center of Numerical Control System School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan China

This paper proposes a novel architecture of the numerical control (NC) system based on multiprocessor and real-time Ethernet. To comply with the trend of modular, open framework NC system, the hardware architecture is composed of ARM, DSP and FPGA modules, of which the ARM module is responsible for HMI (human-machine interface), the DSP module is in charge of core calculation, and the FPGA module plays the role of logical operation and constructs a real-time Ethernet for integrating servo drive modules, machine input/output units into the system. The proposed NC system has the advantages of smart reconfiguration, high performance but low cost. Finally, successful utilization of this system for a hoop bending machine control is briefly described.

关键词： Computer numerical control Real time systems Ethernet networks Digital signal processing Field programmable gate arrays Hardware Man machine systems Servomechanisms Costs Machine control

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Accurate tracking control of a linear fast tool servo unit for noncircular cutting

Accurate tracking control of a linear fast tool servo unit f...

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IEEE International Conference on Mechatronics and Automation

作者： Xuefeng Chang Youping Chen Wu Ai Zude Zhou National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan Hubei China

In this paper, an accurate position tracking control scheme is proposed for a moving-coil-type linear DC motor driven fast tool servo unit for noncircular cutting application. A sliding mode tracking controller is designed to ensure the system has a fast tracking characteristic to the position command. Moreover a disturbance observer is used to estimate and compensate exogenous disturbance to improve robustness and stability of the fast tool servo unit. Because the reference input is approximately periodic in noncircular cutting process. Therefore, the periodic error can he further reduced by augmenting an iterative learning controller to the existing sliding mode controller for repetitive position tracking. The experimental results of noncircular cutting adopting the proposed control method, including tracking performance and robustness of the system, are much improved.

关键词： Servomechanisms Sliding mode control control systems Error correction Robust control Three-term control DC motors Robust stability Machining Fuzzy control

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A novel seam measuring method of complex tight butt joint for laser welding

A novel seam measuring method of complex tight butt joint fo...

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IEEE International Conference on Mechatronics and Automation

作者： Jiayong Wu Pingjiang Wang Xingdou Fu Biao Liu Jihong Chen National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan Hubei China

Seam measuring of complex tight butt joint without misalignment for laser welding is a challenging problem. The allowable seam gap width and misalignment in laser welding process are less than 0.1 mm for thin sheet around 2 mm thickness. Current measuring methods or sensors can not stably and accurately extract 3D seam position and seam gap width, due to narrow seam gap and too little misalignment of the butt joint. Furthermore, almost all sensors can not provide seam surface normal vector directly along with seam position and seam gap width. A novel seam measuring method, integrating the 2D machine vision and 3D structured light vision techniques, is proposed. By projecting a unique pattern of three structured light stripes onto the seam surface, 3D seam position, seam gap width and seam surface normal vector can be accurately acquired from a single image, using the 2D/3D vision information fusion approach. Experimental results demonstrate that the proposed seam measuring method is capable of extracting the integrated seam features of tight butt joint without misalignment stably and accurately.

关键词： Welding Current measurement Laser fusion Position measurement Focusing Surface fitting Computer vision Laser beams Surface emitting lasers Machine vision

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Routing protocol for wireless sensor networks in home automation 8th

Routing protocol for wireless sensor networks in home automa...

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8th IFAC Conference on Fieldbuses and Networks in Industrial and Embedded systems, FeT 2009

作者： Li, Xiao Hui Xu, Hong Qin Hong, Seung Ho Wang, Zhi Piao, Xiang Fan Engineering Research Center of Metallurgical Automation and Measurement Technology Ministry of Education Wuhan University of Science and Technology Wuhan Hubei430081 China State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou310027 China Department of Electronics Information and System Engineering Hanyang University 425-791 Korea Republic of Department of Electronic Information Engineering College of Science and Engineering Yanbian University Yanji133002 China

ISBN: (纸本)9781617825583

Home automation systems based on wireless sensor/actuator networks are characterized by diversity of node power sources, limited computational power, and mobility. We propose a routing protocol that fully uses the location of static nodes to limit the search for a route to a small zone based on the analysis of characteristics and requirements. The calculation of two different kinds of zone and the route discovery procedure are described in this paper. According to the environment of home automation, we compared the performance of our routing protocols with the ad-hoc on-demand distance-vector protocol using simulation and gave suggestions for zone selection. Simulation results showed that our routing protocol dramatically reduced the routing overhead and increased the reliability.

关键词： Routing protocols

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Routing Protocol for Wireless Sensor Networks in Home Automation

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IFAC Proceedings Volumes 2009年第3期42卷 27-33页

作者： Xiao Hui Li Hong Qin Xu Seung Ho Hong Zhi Wang Xiang Fan Piao Engineering Research Center of Metallurgical Automation and Measurement Technology Ministry of Education Wuhan University of Science and Technology Wuhan Hubei 430081 China State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou 310027 China Department of Electronics Information and System Engineering Hanyang University 425-791 Korea Department of Electronic Information Engineering College of Science and Engineering Yanbian University Yanji 133002 China

关键词： Wireless Sensor/Actuator Networks Home Automation Routing Protocol

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