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Three-dimensional surface topography simulation of ultra- precision milling based on point cloud

Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) 2012年第8期40卷 1-6页

作者： Peng, Fangyu Fang, Zhenglong Wu, Jing Yan, Rong State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China National Engineering Research Center for Numerical Control System Huazhong University of Science and Technology Wuhan 430074 China

A three-dimensional surface topography simulation algorithm for ultra-precision milling was proposed. In order to illustrate the formation of surface topography, blade point clouds which were consisted by a serial of blade points according to calculating the instantaneous locations of static discrete blade points in machining process, was introduced as the research object. Meanwhile the servo bounding boxes which were constructed by meshing simulation surface were utilized to selecting sampling points. The comparison between simulation results and measurement pictures shows that the algorithm can clearly illustrate the distribution of scallop in different directions, as well as the influence on the topography caused by initial cutter phrase. Hence, it provides a method to the research the surface topography composition in the range of ultra-precision milling machining.

关键词： Surface topography

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Post-processing algorithm based on total differential method for multi-axis machine tools with arbitrary configuration

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Jixie Gongcheng Xuebao/Journal of Mechanical engineering 2012年第13期48卷 121-126页

作者： Peng, Fangyu Ma, Jiyang Wang, Li Yan, Rong Li, Bin State Key Lab. of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China

Due to existing post-processing algorithm, which is only suitable for a specific type of multi-axis NC machine tool, a generalized method that fits arbitrary configuration is presented. It derives a general kinematic model from multi-body kinematics, and describes the spatial relationship between adjacent CL-data as total differential. The complicated reverse kinematics problem is transformed into solving linear equations. The initial machine control data is solved with the combination of numerical method and total differential method to ensure solving accuracy of subsequent CL-data. In comparison with conventional methods, experiments on a specific machine tool show that the total differential method has attributes of being better generalized, more accurate, and with faster computing speed. © 2012 Journal of Mechanical engineering.

关键词： Machine tools

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Soft-switching analysis of a resonant capacitor current feedback self-oscillating inverter

Soft-switching analysis of a resonant capacitor current feed...

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2012 IEEE 7th International Power Electronics and Motion control Conference - ECCE Asia, IPEMC 2012

作者： Shao, Mingsong Huang, Songling Zhao, Wei Wang, Changquan State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Lighting Research Center Century Zhuoke Energy and Technology Co. LTD Beijing China

ISBN: (纸本)9781457720864

In this paper, we examine a resonant capacitor current feedback (RCCF) self-oscillating resonant inverter from nonlinear point of view. By adopting a four-stage equivalent model, we derive the soft-switching dead time from time-domain for the series resonant capacitor linked parallel load circuit. Importantly, we propose a nonlinear model for the current feedback and gate-drive circuit. Based on analyzing the switching transition interval of this model, the determination of feedback parameters is inferred with given input power and resonant elements. Experimental results have been obtained for a RCCF self-oscillating inverter operating at 3 MHz and 300 V bus voltage. © 2012 IEEE.

关键词： Feedback

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Implementation and design of open control system for industrial robot based on double-CPU

Implementation and design of open control system for industr...

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International Conference on Computing control and Industrial engineering (CCIE)

作者： Tian, Maosheng Tang, Xiaoqi Zhang, Yong State Engineering Research Center of Numerical Control System Huazhong University of Science and Technology Wuhan China Wuhan Huazhong Numerical Control Co. Ltd Wuhan China

ISBN: (纸本)9781424495979

In order to enhance openness and flexibility of industrial robot control system, an open control system based on double-CPU was designed. An embedded industrial computer based on 86 CPU with Windows XP worked as the upper-system, which implemented HMI and management of the open control system. A FPGA(Field Programmable Gate Array) and another same embedded industrial computer with RT-Linux worked as the lower-system, which implemented realtime motion control of the open control system. Ethernet based on a user-defined Ethernet type was used for exchanging data between the two CPU. Experimental results of the open control system being used for controlling a 5 DOF(Degrees of Freedom) flexible-joint manipulator demonstrate that performance of the system can satisfy requirements of different industrial robot application. © 2011 IEEE.

关键词： Industrial robots

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An architecture description language based on dynamic description logics for self-healing systems

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International Journal of Advancements in Computing Technology 2012年第18期4卷 89-96页

作者： Wang, Zhuxiao Peng, Hui Guo, Jing Wu, Kehe Cui, Wenchao Wang, Xiaofeng School of Control and Computer Engineering State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Education Technology Center Beijing International Studies University Beijing 100024 China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China School of Control and Computer Engineering Institute of Electric Information Security Engineering Research Center of Power Information North China Electric Power University Beijing 102206 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

As biological systems exhibit adaptation, healing and robustness in the face of changing environmental behavior, this paradigm has actuated research dealing with the concept of self-healing systems, which attempt to heal themselves in the sense of recovering from malicious attacks and rectifying of system faults. The goal of self-healing systems is to provide survivable systems that require high dependability, robustness, adaptability, and availability. Such systems maintain one or more models, whether external or internal, at run time as a basis for identifying problems and resolving them. This article describes an architectural description language, called ADML, which is being developed as a new formal language and/or conceptual model for representing evolving software architectures. The ADML embraces dynamic change as a fundamental consideration, supports a broad class of adaptive changes at the architectural level, and offers a uniform way to represent and reason about both static and dynamic aspects of self-healing systems. Because the ADML is based on the Dynamic Description Logic DDL(SHON (D)), which can represent both dynamic semantics and static semantics under a unified logical framework, architectural ontology entailment for the ADML languages can be reduced to knowledge base satisfiability in DDL(SHON (D)), and dynamic description logic algorithms and implementations can be used to provide reasoning services for ADML. In this article, we present the syntax of ADML, explain its underlying semantics using the Dynamic Description Logic DDL(SHON (D)), and exemplify our approach by applying it to the domain of load balancing a wireless remote-access system;the preliminary results certify the potential of the approach.

关键词： Formal languages

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Adaptive generalized predictive decoupling control for a class of MIMO nonlinear systems based on unmodeled dynamic compensation

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Kongzhi Lilun Yu Yingyong/control Theory and Applications 2012年第2期29卷 157-166页

作者： Zhang, Ya-Jun Chai, Tian-You Wang, Hong Niu, Hong The State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang Liaoning 110004 China Research Center of Automation Northeastern University Shenyang Liaoning 110004 China The Control Systems Centre School of Electrical and Electronic Engineering University of Manchester M60 1QD United Kingdom Institute of System Science Northeastern University Shenyang Liaoning 110004 China

For a class of uncertain multi-input-multi-output (MIMO) discrete-time nonlinear systems with strong coupling and unstable zero-dynamics, an adaptive generalized predictive decoupling switching control method based on unmodeled dynamic compensation is proposed. It is only required that the higher order nonlinear terms of the system to satisfy a linear growth condition, rather than the global boundedness condition widely used. The analysis of stability and convergence of the adaptive control method are performed. Moreover, in designing the nonlinear generalized predictive decoupling controller, we combine the adaptive-network-based fuzzy inference system (ANFIS) training with the "one-toone mapping" technique to adaptively estimate the unmodeled dynamics, so that the universal approximation property of ANFIS can be guaranteed. Finally, simulation results demonstrate the superiority of the proposed method and validate the theoretical analysis.

关键词： Nonlinear systems

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An online defect classification method for float glass fabrication

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Glass Technology: European Journal of Glass Science and Technology Part A 2011年第5期52卷 154-160页

作者： Peng, Xiangqian Chen, Youping Liu, Huaiguang Xie, Jingming Gu, Chenlin Engineering Research Center of Numerical Control System School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China College of Mechanical and Electrical Engineering Central South University Changsha Hunan China

In float glass fabrication once defects are detected, recognition of the defect type is important for adjustment of the process conditions. Based on analysis of the float process conditions and float glass defects, this paper outlines an adaptive neural network based classification. Twelve features of the defect are picked out as the inputs for defect classification. The ReliefF method is used to evaluate the features, and the sequence of defect features is decided based on the results of the evaluation. The momentum term and adaptive learning rate is used to address the classification's disadvantage of slow learning speed and easy falling into a local minimum. Experiments and real application proves that the float glass defect classification presented here correctly recognizes defects in real time, and satisfies the requirements of float glass fabrication.

关键词： Defects

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Study on path-optimization by grade for sorting dies

Study on path-optimization by grade for sorting dies

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2010 IEEE International Conference on Mechatronics and Automation, ICMA 2010

作者： Wu, Tao Li, Bin Wang, Longwen Huang, Yu National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424451418

Semiconductor light-emitting die (LED) has now become one of the most popular lighting devices. Before dies are put into process of package, they need be inspected and sorted strictly, so following waste will be saved. Cost of inspection and sort is relatively high, it is urgently needed to improve sort efficiency and reduce sort time. To get efficient solution, detailed view of working flow is presented to make analysis on performance and its influenced factors. It can be revealed that positioning of recycle bins is the major influence factor. Performance may decrease by 3.2 to 0.9 dies per second. Because of this, a path optimization method according grade priority is put forward. In this way, the dies with same grade should get priority to be sorted first. Techniques about die search and merge by grade, traversal of forward and backtrack with cross priority are described in detail. With results of reasonable simulations and a case experiment, this optimization is proved highly effective to reduce sort time and improve dies production rate. © 2010 IEEE.

关键词： Motion planning

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Automatic detect and match of LED dies basing on position relations between adjacent dies

Automatic detect and match of LED dies basing on position re...

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International Conference on Machine Learning and Cybernetics

作者： Wu, Tao Li, Bin Wang, Long-Wen Huang, Yu National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424465262

In order to improve production efficiency, inspecting and sorting of LED dies are done respectively in prober and sorter. During the inspection, dies may be broken, fragmentized, tiny moved, or deflected slightly, besides, visual scan can also lead to location deviation when the wafer is moved from prober to sorter. All of this can cause some dies mismatch in the sorting stage, which is never allowed. In order to get integrated match of dies, the position relations between adjacent dies are considered, techniques including diagnosing criterion of position relatives, redundant visual scanning, forward and backtrack algorithm with cross priority are put forward. It is proved with experimental results that such re-index approach is more applicable than traditional index method. When dies arrange in good order, match rate is more than 99.5%, by compassion, that of traditional index method is less than 92%. When the wafer is deflected slightly or locally fragmentized, match rate of the former is more than 92.5%, by contrast, that of the latter is less than 50% in same situation. © 2010 IEEE.

关键词： Dies

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Study on real-time correction method of die declination angles in LED sorting system

Study on real-time correction method of die declination angl...

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International Conference on Mechatronics and Automation

作者： Wu, Tao Li, Bin Wang, LongWen Huang, Yu National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424451418

All dies are required to keep consistent angles in LED chip sorting. Usually, rectification orient real-time vision is used for this but it may decrease production efficiency greatly, because one correction may need several adjustments. Considering that all dies to be sorted are adhesive to wafer tape, each is rotated, locations of all other dies change. It is a problem for following positioning and sorting. To solve this problem, an on-line angle correction method basing on translation compensation is put forward. In this way, angle deviations of dies are transformed as translations of recycling bins. Each die declination can be corrected without any rotations. It does little impact on sorting efficiency because the translation of recycling bins acts concurrently with the die ejection and transporting, etc. Techniques on figuring out displacement compensations are discussed in detail. In addition, SPN model of declination angle correction is built to analyze its influence to production rate. With theoretical analysis and experimental results, it is revealed that sort efficiency may decrease by only 3% for angle correction. Such effect is perfectly acceptable. © 2010 IEEE.

关键词： Stochastic systems

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