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A New Method for Piston Ring Contour Cutting Based on Linear Driving

13th International Conference on Advanced Design and Manufacture

作者： Zhang, Yicheng Chen, Zhihua Yang, Liangcai Chen, Jihong Tang, Xiaoqi College of Mechatronic Engineering and Automation National University of Defence Technology China State Engineering Research Centre of Numerical Control System Huazhong University of Science and Technology China Reserch Institute of Numerical Control Kunming University China

ISBN: (纸本)9781848002401

It is not easy to processing piston ring contour because of its complicating shape. From view of time-domain analysis, in order to trace the curve of piston ring, servo actuator must have high speed and acceleration to complete movement of back and forth. From view of frequency -domain analysis, the order of harmonic of the piston ring contour is very high, so the control system bandwidth also should be wide enough. It's hard to satisfy these requirements for the traditional drive methods by using rotate serve and Lead screw. In this paper, a new method of direct drive by linear motor is provided, And achieve good results.

关键词： linear motor piston ring numerical control

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A clock synchronization method based on IEEE 1588 and its implementation on Ethernet

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Journal of Chongqing University 2008年第2期7卷 145-150页

作者：许万 The State Engineering Research Center of Numerical Control System Huazhong University of Science and Technology

We presented a clock synchronization method that contained a clock adjusting algorithm and a frequency compensated clock to achieve precise synchronization among distributed clocks based on IEEE 1588 ***,we presented its application on Ethernet and implementation of the frequency compensated clock in a field programmable gate array(FPGA) as *** results indicate that this method can support sub-microsecond synchronization with inexpensive standard crystal oscillators.

关键词： clock synchronization clock adjustment frequency compensation IEEE 1588

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Annual business and news: Beginning the 32nd year

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Journal of Guidance, control, and Dynamics 2009年第1期32卷 1-7页

作者： Schmidt, George T. Akella, Maruthir Balakrishnan, S.N. Campbell, Mark E. Clarke, John-Paul Colgren, Richard D. Crassidis, John L. Doman, David B. Eke, Fidelis O. Enns, Russell J. Gawronski, Wodek Hablani, Hari B. Leitner, Jesse A. Ping, Lu MacDonald, Malcolm McFarland, Michael B. Melton, Robert G. Mitchell, James Mukhopadhyay, Vivekanand Sasiadek, Jurek Z. Schaub, Hanspeter Wise, Kevin A. United States NATO Systems and Electronics Technology Panel Lecture Series on Low Cost Navigation Sensors and Integration Technology U.S. Air Force Office of Scientific Research United States United States American Automatic Control Council United States Sibley School of Mechanical and Aerospace Engineering Cornell University United States School of Aerospace Engineering Air Transportation Laboratory Georgia Institute of Technology United States Lockheed Martin Aeronautics Company Palmdale CA United States United States Wright-Patterson Air Force Base Dayton OH United States Davis United States Apache Longbow Jet Propulsion Laboratory California Institute of Technology United States GSFC United States Department of Aerospace Engineenng Iowa State University United States Raytheon Electronic Systems United States Department of Aerospace Engineering Pennsylvania State University United States NASA Langley Research Center United States Indian Institute of Technology India Department of Aerospace Engineering Carleton University Canada International Federation of Automatic Control Robotics Technical Committee Joint Robotics and Control Systems Societies Chapter Ottawa Canada X-45 Joint-Unmanned Combat Air System Program

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Annual business and news:: Beginning the 31st year of the Journal of Guidance, control, and Dynamics

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JOURNAL OF GUIDANCE control AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

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research on Ultra-Low Speed control of PMSM in Servo system

Research on Ultra-Low Speed Control of PMSM in Servo System

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7th World Congress on Intelligent control and Automation (WCICA 2008), vol.6

作者： Yucheng Bai Xiaoqi Tang Jihong Chen Fangyu Peng National NC System Engineering Research Center Huazhong University of Science슠and슠Technology Wuhan Hubei China Wuhan Huazhong Numerical Control Company Limited Huazhong University of Science슠and슠Technology Wuhan Hubei China

Two new methods to improve the Ultra-low speed control performance of ac servo system are described in this paper. One is improved M/T method, which could minimize the influence of speed detection dead time and smooth the measurement Another is instantaneous speed detection based on constant jerk model, which assumes the rotor jerk is constant at the interval of sampling period. The instantaneous speed is calculated by analytic geometry. This method can minimize both the speed detection dead time and detection delay, which is the premise of low-speed control. The effectiveness of these methods has been confirmed by experimentation. The experimental system is composed of a digital signal processor (DSP), a field programmable gate array (FPGA), a PWM inverter and a permanent magnet synchronous motor (PMSM).

关键词： Ultra-low speed Improved M/T method Instantaneous speed PMSM Servo

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Adaptive real-time network design of embedded system

Adaptive real-time network design of embedded system

引用

2nd IEEE/ASME International Conference on Mechatronic and Embedded systems and Applications, MESA 2006

作者： Tao, Huang Yunfei, Zhou Ming, Zhong National Numerical Control System Engineering Research Center Huazhong University of Science and Technology 430074 China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology 430074 China School of Information Engineering Wuhan University of Technology 430070 China

ISBN: (纸本)0780397215

Aimed for the real-time requirement of Ethernet in embedded system, an Agent-based system was presented. There were one managing node and a lot of control nodes in this new system. In order to reduce the real-time decline resulting from channel conflict, every control node was assigned a default priority and the control nodes with the same priority formed a group. Every control node communicated with each other and managing node based on the priority groups they belonged to. Master Agent in managing node received different status data from every Sub Agent in the control nodes in different cycles. A dynamic adjustment model was set up in Master Agent. The status data gathered from control nodes were counted as inputs of the model;thus, through the model, the priorities of these control nodes could have dynamic adjustments. Network communication distributed channel resources by way of dynamic priorities, ensuring not only that there was less communication conflict among nodes at a certain moment, but also that adaptive adjustments of priorities could be achieved to improve transmission efficiency. The analysis and the simulation results demonstrate the method is correct and efficient.

关键词： Embedded systems

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A Generalized Acceleration and Deceleration Approach for Continuous Small Line Blocks with Look-ahead

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武汉理工大学学报 2006年第S3期28卷 1052-1058页

作者： LUO Fuyuan~1 ZHOU Yunfei~1 YIN Juan~2 (1.National Technical research center-numerical control system,School of Mechanical Science and engineering,Huazhang University of Science and Technology,Wuhan 430074,China, 2.School of Machinery and Automobile engineering,Hefei University of Technology,Hefei 234009,China) National Technical Research Center-Numerical Control System School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Machinery and Automobile Engineering Hefei University of TechnologyHefei 234009China

Generally complex 3D contours are divided into a lot of continuous small line blocks by CAD/CAM software. When these small line blocks are used in conventional way,machine tool has to stop at the end of one move before continuing on to the next to meet accuracy requirement,which results in ***-ahead is an intelligent function that aims at adjusting the feed rate automatically to achieve maximum productivity while maintaining *** now most researchers just utilize the simplest linear acceleration(ACC)and deceleration(DEC)to deal with look-ahead intelligence.A generalized ACC/DEC ap- proach and corresponding optimal look-ahead algorithm based on dynamic back tracking along a doubly linked list are *** improved rounding strategy for reducing interpolation errors is also *** using the proposed techniques,arbitrary velocity profiles that offer look-ahead feature and have the desired ACC/DEC characteristics for movement of a lot of continuous line blocks can be generated *** simulations and experiments showed the productivity was dramatically increased without sacri- fice of accuracy.

关键词： acceleration and deceleration numerical control back tracking look-ahead interpolation

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Adaptive real-time networks design and simulation based on IC wedge-bonding control system

Adaptive real-time networks design and simulation based on I...

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2006 International Technology and Innovation Conference (ITIC 2006)

作者： Tao Huang Ming Zhong YunFei Zhou National Numerical Control System Engineering Research Center Huazhong University of Science & Technology Wuhan 430074 China School of information engineering Wuhan University of Technology 430070 China

Aimed at the real-time requirement of the Ethernet in the IC wedge-bonding control system, a communication system with a neural-network-based adjustment module was presented. This new system consisted of a managing node and many control nodes. In order to reduce the real-time decline resulting from channel conflict, every control node was assigned a default priority and the control nodes with the same priority fell into one group. control nodes communicated among themselves and with the managing node based on the priority groups they belonged to. An adjustment module based on the continuous Hopfield neural network (CHNN) was employed in the managing node. The status data gathered from the control nodes were counted as inputs of the module; thus, through the self-learning function of the module, the priorities of these control nodes could have dynamic adjustments. The adjustment module distributed channel resources by way of dynamic priorities, ensuring not only that there was less communication conflict among nodes at a certain moment, but also that adaptive adjustments of priorities could be achieved to improve transmission efficiency. The analysis and the simulation results demonstrate that the method is correct and efficient.

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A generalized acceleration and deceleration approach for continuous small line blocks with look-ahead

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology 2006年第SUPPL. 1期28卷 1052-1058页

作者： Luo, Fuyuan Zhou, Yunfei Yin, Juan National Technical Research Center-Numerical Control System School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Machinery and Automobile Engineering Hefei University of Technology Hefei 234009 China

Generally complex 3D contours are divided into a lot of continuous small line blocks by CAD/CAM software. When these small line blocks are used in conventional way, machine tool has to stop at the end of one move before continuing on to the next to meet accuracy requirement, which results in inefficiency. Look-ahead is an intelligent function that aims at adjusting the feed rate automatically to achieve maximum productivity while maintaining accuracy. By now most researchers just utilize the simplest linear acceleration (ACC) and deceleration (DEC) to deal with look-ahead intelligence. A generalized ACC/DEC approach and corresponding optimal look-ahead algorithm based on dynamic back tracking along a doubly linked list are proposed. An improved rounding strategy for reducing interpolation errors is also presented. By using the proposed techniques, arbitrary velocity profiles that offer look-ahead feature and have the desired ACC/DEC characteristics for movement of a lot of continuous line blocks can be generated efficiently. Both simulations and experiments shouted the productivity was dramatically increased without sacrifice of accuracy.

关键词： Acceleration and deceleration Back tracking Interpolation Look-ahead numerical control

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Announcements, comments, and acknowledgments

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AIAA Journal 2006年第1期44卷 1-10页

作者： Oran, Elaine Kailasanath, Kazhikathra Aggarwal, Suresh K. Ahmadian, Mehdi Alexandrov, Natalia Auweter-Kurtz, Monika Bailly, Christophe Balachandran, Balakumar Berman, Alex Candler, Graham V. Chelliah, Harsha K. Chokani, Ndaona Fujii, Kozo Gaitonde, Datta V. Ghia, Kirti Karman N. Givi, Peyman Gore, Jay P. Kaplan, Carolyn R. Livne, Eli Lucht, Robert P. Messac, Achille Wing, N.G. Palazotto, Anthony N. Pierre, Christophe Plotkin, Allen Roy, Ajit K. Saigal, Sunil Sforza, Pasquale M. Shivakumar, Kunigal N. So, Ronald M.C. Springer, Anthony M. Anatolitumin, Anthony M. Zhong, Xiaolin United States Division of Computational Physics United States United States AIAA United States APS United States National Academy of Engineering United States Center for Reactive Flow and Dynamical Systems Naval Research Laboratory United States Institute of Physics Department of Mechanical Engineering University of Illinois at Chicago United States ASME Combustion Institute Department of Mechanical Engineering Virginia Polytechnic Institute State University United States Aeronautics Systems Analysis Branch NASA Langley Research Center United States SIAM ISSMO Aerospace Engineering Institute of Space Systems Universität Stuttgart Germany Amelia Earhart Italy International Amelia Earhart Award Committee Italy France France Mechanical Engineering University of Maryland College Park United States AAM SPIE ASA ASME Technical Committees of Multi-Body Systems Nonlinear Dynamics Dynamics and Control of Structures and Systems American Helicopter Society United States Aerospace Engineering and Mechanics University of Minnesota United States AIAA Thermophysics Technical Committee Mechanical and Aerospace Engineering University of Virginia United States AIAA Propellants and Combustion Technical Committee AIAA's Transition Study Group Aerodynamics Measurement Technology Technical Committee Thermophysics Technical Committee Japan MOSAIC project on the Technology Pressure-sensitive Paint Measurement System Japan High-Speed Flows Group Air Vehicles Directorate Air Force Research Laboratory Wright-Patterson Air Force Base United States Wright State University United States Aerospace Engineering and Engineering Mechanics United States United States Mechanical Engineering University of Pittsburgh United States School of Mechanical Engineering Purdue University United States Committee on Heat Transfer in Fire and Combustion Systems Japan Board of Advisors Central States Section Combustion Institute United States AIChE United States Tau Beta Pi United States

No abstract available

关键词： Institute of Space and Astronautical Science American Society of Mechanical Engineers Direct numerical Simulation Aerospace engineering MDO Propellant Air Forces Aerodynamics Heterogeneous Combustion NASA Langley research center

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