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International Conference on Computer Integrated Manufacturing

作者： B.H. Krogh W.L. Genter Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Process Control and Manufacturing Technology Division Alcoa Technical Center Alcoa Center PA USA

Petri nets are applied to the bottom-up design of a handshaking protocol for transferring parts through a sequence of workstations. The authors illustrate the application of Petri-net theory to verify properties of the complete system behavior based on the structure of the Petri-net model. It is shown that communication between local controllers is modeled by places corresponding to upstream and downstream messages. Consistency in the interconnection of the subsystem models is guaranteed by the identification of these communication places. To analyze the properties of the complete system, results on liveness and place invariants for Petri nets are applied to the Petri-net model.< >

关键词： Protocols Workstations Petri nets Power system modeling Communication system control Algorithm design and analysis Computer aided manufacturing Virtual manufacturing Computational modeling System performance

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Analysis of Thermal Camber control in Rolling Mills

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IFAC Proceedings Volumes 1990年第8期23卷 149-154页

作者： G.C. Goodwin B.M. Carney W. John Edwards Centre for Industrial Control Science Department of Electrical Engineering and Computer Science University of Newcastle N.S.W. 2308 Australia Industrial Automation Services Pty. Ltd. 173 Main Road Speers Point N.S.W. Australia

The demand for wider, thinner rolled steel has led to an increasing interest in the control of the strip “shape”. Mechanisms for controlling shape include roll bending, roll tilt (or mill steer) and spray pattern control. This paper will principally focus on an analysis of the spray control system and the associated interaction between adjacent zones. This paper decribes a new approach to shape control, a mathematical model is derived for the dynamic thermal expansion of the rolls of the a tandem cold rolling mill. The model structure has been specifically designed to facilitate control studies. The system is highly non-linear but the model suggests how the system can be linearized by an appropriate input signal transformation. The linearized system then represents a coupled multi-input multi-output dynamical system linking the cooling water sprays to the measured exit strip shape. This linearized model leads to a dynamical decoupling procedure which reduces the system to a set of single-input single—output control systems. Apart from the application to shape control, the method proposed here has more general applicability since the same kind of problem arises in a variety of cross-machine probelms.

关键词： Rolling Mills Shape control Decoupling Simulation Non Linear control System

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Learning control system design based on 2D theory-an application to parallel link manipulator

Learning control system design based on 2D theory-an applica...

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IEEE International Conference on Robotics and automation (ICRA)

作者： Z. Geng J.D. Lee R.L. Carroll L.H. Haynes Department of Electrical Engineering and Computer Science George Washington University Washington D.C. DC USA Guidance and Control Branch NASA''s Goddard Space Flight Center Greenbelt MD USA Intelligent Automation Inc. Rockville MD USA

An approach to iterative learning control system design based on 2D system theory is presented. A 2D model for the iterative learning control system which reveals the connections between learning control systems and 2D system theory is established. A learning control algorithm is proposed, and the convergence of learning using this algorithm is guaranteed by 2D stability. The learning algorithm is applied successfully to the trajectory tracking control problem for a parallel link robot manipulator. The excellent performance of this learning algorithm is demonstrated by computer simulation results.< >

关键词： control systems Iterative algorithms control system synthesis Iterative methods Convergence Stability Trajectory Parallel robots Manipulators Computer simulation

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STRUCTURE SYNTHESIS OF INVARIANT control-SYSTEMS

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INTERNATIONAL JOURNAL OF control 1989年第5期49卷 1453-1463页

作者： YAKOVLEV, VB IMAEV, DH Department of Automation and Control Processes Leningrad Electrical Engineering Institute Leningrad 197022 Professor Popov Street 5 United States

Invariance is a primary characteristic of a control system. It is strongly interrelated with the system structure where the latter provides a necessary condition for the invariance. The relationship is established by using various formal languages among which the graph-theoretic model seems most adequate when it comes to analyzing the causal relations between components of the system. The present work aims to reflect the close interdependence between a number of invariance types and graph structures. Some typical algorithms for solving the problems of structure selection are demonstrated. © 1989 Taylor & Francis Group, LLC.

关键词： control Systems

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A simulation technique for control systems with multiple interrelated nonlinear phenomena and energy storage elements

A simulation technique for control systems with multiple int...

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Annual Conference of Industrial Electronics Society

作者： P.H. Lewis P. Angeli Department of Electrical Engineering Michigan Technological University Houghton MI USA Process Instrumentation and Control Engineering Department 3M Center 3M Corporation Saint Paul MN USA

A method is described for the systematic development of computer models for control systems with complex relationships between multiple nonlinear phenomena and energy-storage elements. The specific example of an electromechanical position control system, with consideration of interrelated actions that include static friction, Coulomb friction, backlash, and a significant inertial load, is considered. The use of piecewise-linear models provides an extensive set of operational modes, but methodology is presented for consideration of the conditions for all possible changes of mode and the actions that accompany each change. Simulation results are presented.< >

关键词： control system synthesis Nonlinear control systems DC motors Friction Position control Piecewise linear techniques Gears Energy storage Computational modeling Rotors

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Workload redistribution for fault-tolerance in a hard real-time distributed computing system

Workload redistribution for fault-tolerance in a hard real-t...

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International Symposium on Fault-Tolerant Computing (FTCS)

作者： S. Balaji L. Jenkins L.M. Patnaik P.S. Goel Control Systems Division ISRO Satellite Centre Bangalore India Department of Electrical Engineering Indian Institute of Science Bangalore India Department of Computer Science & Automation Indian Institute of Science Bangalore India

In a hard real-time distributed computing system (HRTDCS), all the tasks are required to meet their associated deadlines; a task not meeting its deadline leads to a catastrophic failure of the system. The authors consider an HRTDCS that executes both periodic and aperiodic tasks associated with timing, precedence, and resource constraints. The fault-tolerance capability in such a system is achieved through the use of time redundancy. The problem of workload redistribution for fault tolerance in an HRTDCS is studied. A graph model to represent the system workload is developed. Three performance measures for the analysis of an HRTDCS are defined. A nonpreemptive scheduling algorithm is proposed to distribute the workload of the operational nodes of the HRTDCS in the presence of both hardware and task failures. This task allocation strategy is applied to a practical system, namely, the HRTDCS onboard a spacecraft. The performance measures obtained for a typical system workload indicate that the algorithm is quite suitable for an HRTDCS with regard to uniform workload distribution.< >

关键词： Fault tolerance Real time systems Distributed computing Timing Fault tolerant systems Redundancy Performance analysis Scheduling algorithm Hardware Space vehicles

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MPCS - THE MANUFACTURING process-control SYSTEM

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AT&T TECHNICAL JOURNAL 1986年第4期65卷 35-45页

作者： DUNIETZ, IS HSU, JLC MCEACHERN, MT STOCKING, JH SWARTZ, MA TROMBLY, RM The authors Irwin S. Dunietz John L.C. Hsu Michael T. McEachern James H. Stocking Mark A. Swartz andRodney M. Tromblyare responsible for design and development of the Manufacturing Process Control System. Mr. Dunietz joined AT&T in 1980. He is a member of the technical staff in the Manufacturing Information Automation department at AT&T Engineering Research Center Princeton New Jersey. He received an A.B. in mathematics from Cornell University and an M.S.E. in computer science from Princeton University. Mr. Hsu who joined AT&T in 1970 is a department head in the Manufacturing Information Automation department at the Engineering Research Center. He received an M.S. in electrical engineering from the University of Missouri. Mr. McEachern joined AT&T in 1962 and is a supervisor in the 5ESS™ Line Unit Manufacturing department at AT&T Technologies in Oklahoma City Oklahoma. He is responsible for the manufacturing process control center in Oklahoma City which provides computerized support for all circuit pack manufacturing. Mr. Stocking who joined AT&T in 1975 is a supervisor in the Manufacturing Information Automation department at the Engineering Research Center. He received a B.S. in chemical engineering from Rensselaer Polytechnic Institute and a Ph.D. in chemical engineering from the University of California Berkeley. Mr. Swartz joined AT&T in 1980 and is a member of the technical staff in the Manufacturing Information Automation department at the Engineering Research Center. He received an A.B. in computer science from Cornell University and an M.S. in computer science from Rutgers—The State University. Mr. Trombly who joined AT&T in 19 78 is an assistant manager at the AT&T Merrimack Valley Works in Massachusetts. Previously he was a supervisor at the Engineering Research Center. He holds a B.S. in computers and systems engineering and an M.S.E.E. from Rensselaer Polytechnic Institute.

The central challenge of all manufacturing is making products to the right standards and delivering them at the right time. AT&T is upgrading its corporate and factory resource planning systems to improve control of day-to-day manufacturing. The Manufacturing process control System (MPCS), developed at the AT&T engineering Research Center (ERC), provides this support. MPCS connects the shop floor with production scheduling, accounting, product data archive, and engineering support systems.

关键词： PRODUCTION control

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A projection method for simplifying robot manipulator models

A projection method for simplifying robot manipulator models

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IEEE International Conference on Robotics and automation (ICRA)

作者： A. Desrochers C. Seaman Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY Process Control and Computer Technology Division Alcoa Technical Center Alcoa Center PA

The equations of motion for a robotic manipulator are a very lengthy and complicated set of nonlinear, highly coupled differential equations. A simplified model that reveals the dominant dynamics would be valuable for purposes of utilizing modern control theory. In this work, a method is presented for obtaining a reduced model for a nonlinear system. The structure of the simplified model is assembled from a library of the nonlinear basis terms that were present in the original model. This p-term structure is selected from the library in p-stages using a recently developed optimization scheme based on projection matrices and conjugate direction ideas. The algorithm is used to identify the dominant dynamics of several robot manipulator models and the results are verified on the GCA P300V robot in RPI's Robotics and automation Laboratory.

关键词： Robots Manipulator dynamics Robotics and automation Differential equations Libraries Nonlinear equations Couplings Nonlinear dynamical systems control theory Nonlinear systems

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Analysis, control and identification of distributed parameter and time delay systems using piece wise constant orthogonal basis functions - An overview

Analysis, control and identification of distributed paramete...

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IEEE Conference on Decision and control

作者： S. G. Tzafestas Ganti Prasada Rao Control and Automation Group Division of Coputer Science National and Technical University of Athens Athens Greece Department of Electrical Engineering Innvan Tostitute of Technology Kharagpur West Bengal India

This paper presents an overview of the recent developments in analysis, control and identification of distributed parameter and time-delay systems using piecewise constant orthogonal basis functions such as walsh func... 详细信息

关键词： control system analysis control systems Delay effects

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The Hungarian Educational System and its Transfer Abroad

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IFAC Proceedings Volumes 1984年第2期17卷 3479-3493页

作者： Z. Benyó Department of Process Control Budapest Technical I'mvtrsift. Faculty of Electrical Engineering. Miiegsetem rkp. 9 Budapest Hungary

The Hungarian People's Republic is an East European country whose educational systems are not well known all over the world. This article presents a short survey of Hungary's historic background and her educational system. The organization of the BTU /Budapest Technical University/ and Faculty of electrical engineering are discussed in detail. In the second part of the article the export archievements of the Hungarian educational systems are discussed.

关键词： Education educational aids broadcasting digital systems control engineering instrumentation control automation data transmission telecommunication teaching maturity examination

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