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Teacon--a simulator for computer-aided teaching of process control

computer applications in Engineering Education 1993年第4期1卷 307-307页

作者： Feyo, de Azevedo, S. Oliveira, F. Cardoso, A.C. Departamento de Engenharia Química Faculdade de Engenharia Universidade do Porto Rua dos Bragas 4099 Porto Codex Portugal Sebastião Feyo de Azevedo:is an Associate Professor of Chemical Engineering at the University of Porto. He is a licenciate in chemical engineering from the University of Porto (1973) and earned his PhD in Chemical Engineering from the University of Wales (1982). His interests are in the areas of modeling optimization and process control. Departamento de Electrónica Industrial Universidade do Minho Largo do Paço 4700 Braga Portugal Filomena Oliveira:is a graduate of the Chemical Engineering Department University of Porto 1986. She earned an MSc degree in Electrical Engineering from the same University (1991). She is currently Assistant-Lecturer in the Department of Industial Electronics University of Minho and is working toward her PhD in the control of biological reactors. Departamento de Engenharia Electrotécnica e dos Computadores Faculdade de Engenharia Universidade do Porto Rua dos Bragas 4099 Porto Codex Portugal Artur Capelo Cardoso:is a Lecturer at the Department of Electrical and Computer Engineering of the University of Porto. He earned his PhD from Syracuse University in 1987. His interests are in the areas of electronics signal processing and control.

“TEACON—TEAching control” is a PC-based package for computer-aided teaching of digital control of Single Input-Single Output (SISO) systems. A large variety of processes and control actions is possible. The program simulates systems in “real time” or faster than “real time.” process and control parameters can be changed on-line during runs. Set-point and process load can also vary according to predefined functions. The program computes the ISE, IAE, and ITAE indexes, allowing studies of controller tuning and performance. Other characteristics which enhance the simulation of real systems are the saturation of sensors and controller at 0 and 100%, the ability to superimpose noises on the measurements, and the possibility of defining dead-times associated with the measurements and with the process.

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ACCURACY REQUIREMENTS FOR MEASUREMENT SYSTEMS WITH UNIFORM AND NORMAL ERRORS

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NAVAL ENGINEERS JOURNAL 1993年第1期105卷 66-69页

作者： SNOW, JM STUCKMAN, BE USHER, JS Jeffrey M. Snow:received his B.S. degree in mechanical engineering from the University of Washington in 1977. He has worked at Boeing Commercial Aircraft Company and Puget Sound Naval Shipyard. Since 1985 he has been at Naval Surface Warfare Center Crane Division (NSWCC). From 1987 to 1990 he was in charge of quality assurance configuration management and reliability for Aegis (SPY-1 and Mk-99) microwave tubes. He currently is in the Radar System Branch at NSWCC. He is a member of ASQC and ASME. His areas of interest include the use of statistics in process improvement efforts and objectively rating and rewarding suppliers for better quality. Bruce E. Stuckman:holds a Ph.D. degree in systems engineering from Oakland University where he also obtained M.S. and B.S. degrees in electrical and computer engineering. In 1992 Dr. Stuckman obtained his J.D. from the University of Louisville where he graduated cum laude. He is currently an associate in the patent and computer law department of Brooks & Kushman a law firm specializing in intellectual property and technology related causes. Prior to this he was an associate professor of both electrical engineering at the University of Louisville and a member of the Research Advisory Board of the South Central Bell Telecommunications Research Center. Dr. Stuckman is the author of over 75 published works in a variety of research areas including global optimization algorithms control systems communication and telecommunication systems and instrumentation electronics. He has served as a technical consultant to such organizations as Control Data Corporation General Electric General Motors Research Laboratories Gulf & Western AT&T Bell Laboratories ARCO Research and Technical Services and the U.S. Government and has been a frequent lecturer at national and international symposia. He is a senior member of IEEE and a member of ASNE Eta Kappa Nu Tau Beta Pi Sigma Xi and Phi Kappa Phi. John S. Usher Ph.D. P.E.:is an assistant professor of industrial engineering

Accuracy requirements are usually determined as a percentage of the specification range of the measured part or process. Setting accuracy requirements in this manner results in a wide and unpredictable range of false rejection and acceptance probabilities. This causes extra costs due to either: 1) over specification of measurement systems accuracy requirements;2) time, effort, retesting, and resolution of false rejections;or 3) system degradation caused by false acceptance of out-of-specification parts. Achieving a consistent and known risk of false acceptance is only possible by considering the measured process C(pk), the process's mean in relation to the center of the specification range, and the measurement system error distribution. This paper presents a method for calculating the probabilities of false rejection and false acceptance for a normal process which is measured with, alternately, uniform and normally distributed error. It is shown that under most conditions uniform error causes 20% to 30% higher false rejection and acceptance probabilities. Thus, knowledge of measurement error distribution could provide lower total production cost.

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A New Parameter Estimation Algorithm for Bounded Error Models

A New Parameter Estimation Algorithm for Bounded Error Model...

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Singapore International Conference on Intelligent control and Instrumentation, SICICI

作者： G. Sotirov B. Shafai Department of Process Control Technical University Sofia Bulgaria Department of Electr and Computer Engineering Northeastern University Boston MA USA

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A Comparison of Three Nonlinear controller Designs Applied to a Non-Adiabatic First-Order Exothermic Reaction in a CSTR

A Comparison of Three Nonlinear Controller Designs Applied t...

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American control Conference (ACC)

作者： M. J. Piovoso K. A. Kosanovich V. Rokhlenko A. Guez Corporate Process Control Techinical Engineering E. l. Du Pont de Nemours and Company Inc. Wilmington DE USA Department of Electrical and Computer Engineering Drexel University Philadelphia PA USA

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computer aids for chemical engineering education. An assessment of CACHE-1971-1992

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computer applications in Engineering Education 1992年第1期1卷 3-3页

作者： Seider, W.D. Chemical Engineering Department University of Pennsylvania Philadelphia Pennsylvania 19104–6393 Warren Seider:is Professor of Chemical Engineering at the University of Pennsylvania. His research is in the area of process design with an emphasis on operability and controllability. In coursework he uses the computer actively to teach design synthesis process control and separation processes. Warren is a coauthor ofIntroduction to Chemical Engineering and Computer CalculationsandFLOWTRAN Simulation—An Introduction. He has served as the first President of the CACHE Committee and chair of its Curriculum Task Force. He received his BS degree from the Polytechnic Institute of Brooklyn and his PhD from the University of Michigan.

Since its inception in 1971, the computer Aids for Chemical Engineering Education (CACHE) Corporation has concentrated on promoting cooperation among universities, industry, and government in the development and distribution of computer-related and/or technology-based educational aids for the chemical engineering profession. This article assesses the success of several projects designed to provide aids for individual courses, as well as for a broader segment of the curriculum. The projects include: (1) the provision of 125 computer assignments for the core courses; (2) the preparation of teaching materials for, and the distribution of, Monsanto's FLOWTRAN program for use in the design courses; (3) the preparation of PC modules for many courses, leading to the Michigan project on the Development of Innovative Engineers, the Washington project on Graphical computer Aids for fluid flow and reaction in the design of chemical reactors, and the Purdue project on Laboratory Modules; and (4) the development of the MICROCACHE courseware delivery system. Also considered are the CACHE recommendations concerning the minimum requirements for computing in the undergraduate curriculum, presented to the AIChE Education and Accreditation Committee. The CACHE Corporation has facilitated several research conferences, the impact of which is assessed.

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IMPROVING THE SHIP DESIGN, ACQUISITION AND CONSTRUCTION process

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NAVAL ENGINEERS JOURNAL 1992年第2期104卷 39-57页

作者： RYAN, JC JONS, OP J. Christopher Ryan:earned his bachelor's and master's degrees in Naval Architecture from Webb Institute and MIT respectively. He spent three years at the Advanced Marine Technology Division of Litton Industries working on the DD-963 class ship design and related computer aided design projects. he subsequently went to the Navy Department concentrating on early stage design of surface combatants for 12 years including work on the FFG-7 Sea Control Ship CSGN and CVV aircraft carrier projects. He then shifted focus and became the technical director for the Computer Supported Design Program in NavSea for five years. Mr. Ryan has served in several supervisory positions within the Ship Design Group in NavSea since that time. He is currently the project manager for the Ship Design Acquisition and Construction Process Improvement Project. Otto P. Jons:received a Diplom Ing. in shipbuilding from the Technical University of Hannover W. Germany and an M.S. in naval architecture and marine engineering from the Massachusetts Institute of Technology in 1967. He then joined Litton Ship Systems where he was responsible for the preliminary design of the DD-963 hull structure and then for ship systems as manager LHA Ship Systems Engineering Department. From 1972 to 1974 he was principal research scientist at Hydronautics. In 1976 as technical director he helped establish the local office of Designers and Planners. Otto Jons was one of the co-founders of Advanced Marine Enterprises Inc. in 1976 where he is corporate vice president engineering.

In the spring of 1990, the NavSea Chief Engineer initiated a project to improve the design, acquisition and construction (DAC) of U.S. Navy ships. The project's objectives are to reduce the time and cost of acquiring and operating Navy ships while improving their quality, unlike previous studies on the subject, the project utilizes a rigorous process analysis approach and attempts to use quantitative measures as the basis for recommending improvements. The paper is, of necessity, a status report on the progress of this project. Topics covered include: the DAC process;a look at the current state of ship acquisition time, cost, and quality;the methodology for process improvements;and early findings.

关键词： Naval Vessels

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Interval Identification and Robust control Design: A New Perspective

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IFAC Proceedings Volumes 1991年第8期24卷 155-160页

作者： B. Shafai G. Sotirov Department of Electrical and Computer Engineering Northeastern University Boston MA 02115 USA Department of Process Control Faculty of Automatics Technical University. Sofia-l156 Bulgaria

This paper aims initially to present an identification method for constructing an interval model which can be aggregated to robust control design. Mathematical programming is used as a tool to achieve this goal. We, then, formulate necessary conditions for robust stability of continuous and discrete interval plants and seek low order controller candidates for both cases. Decision making strategies based on Kharitonov and Mansour-Kraus results are proposed to effectively construct and solve standard linear programming problems instead of interval ones. The so obtained candidates are cheked for guaranteed robust stabilizers using (generalized) edge or box theorems

关键词： Identification interval plants robust control stability mathematical programming

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Petri net analysis of a transfer-line protocol

Petri net analysis of a transfer-line protocol

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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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Design and Implementation of Practical Digital PID controllers

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IFAC Proceedings Volumes 1989年第18期22卷 115-121页

作者： L. Rozsa Department of Process Control Computer and Automation Institute of the Hungarian Academy of Sciences Kende u. 13-17 H 1111 Budapest Hungary

Literature on process control is awash with contributions made in the field of digital controller design. On the one hand there are great efforts to devise new control algorithms and controller design methods based on elegant mathemtics and state variables concealing even the most rudiræntary inner workings of a real process. Results are mostly documented by simulations. On the other hand there are contributions directed towards improving the digital equivalent of the traditional PID controller. The debate over the virtues of different versions of the PID algorithm gave way lately to the adaptive tuning of these controllers. This way a definite shift of emphasis can be noticed, but - at least in the author’s opinion - a general view, encompassing all of the basic features of a practical digital PID controller is still lacking. This paper is an attempt to meet this need.

关键词： Digital PID cascade feedforward and override control

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Software Environment for Robot control Algorithms Experimentation

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IFAC Proceedings Volumes 1988年第6期21卷 179-184页

作者： F. Nicolò G. Ulivi P. Pinello K. Tihanyi I. Körösi Department of Computer Systems and Science University of Rome La Sapienza Via Eudossiana 18 00184 Rome Italy Department of Process Control Technical University of Budapest Miiegyetem rkp. 9 H-1111 Budapest Hungary

The paper concerns the development of a laboratory environment suitable to show the fundamental robot control techniques. In the first part the main characteristics of the used robot are detailed together with the control electronics. In the second part the C and assembly language software environment is described, which derives from another one developed for research purposes using an IBM XT286 configuration. The interactive software frame, available under either the MS-DOS or the UNIX like QNX operating systems, uses selectable operational modes to analize the performances of different control algorithms. New control algorithms can be developed in C language and installed in the software frame after being off-line tested.

关键词： Education robot control multitasking real-time applications control software

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