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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： T. Tezuka T. Yamashita T. Sato Y. Abiko T. Kanai M. Sawada Power & Industrial Systems Research & Development Center TOSHIBA Corporation Fuchu Tokyo Japan Metal Systems Engineering Department TOSHIBA GE Automation Systems Corporation Minato Tokyo Japan Industrial Control Systems Division Toshiba IT and Control Systems Corporation Fuchu Tokyo Japan Kakogawa works Kobe Steel Company Limited Kakogawa Hyogo Japan

In July 2000, a new automatic gauge control (AGC) system was successfully installed at Kobe Steel's Kakogawa works. The new AGC system consists of two functions: multivariable AGC based on mass flow thickness and roll eccentricity control. The multivariable AGC is designed using ILQ (inverse linear quadratic) theory, a type of optimal control theory, and controls both thickness and tension. Repetitive control theory is applied to roll eccentricity control as roll eccentricity is a periodic disturbance related to the rotational angle of the rolls. The new AGC system has contributed to improved thickness accuracy and stable rolling. In this paper, details of the new AGC system are described and the application results are shown.

关键词： Automatic control control systems Milling machines Strips Thickness control Optimal control Fluctuations Steel Industrial control Weight control

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A neural network controls the galvannealing process

A neural network controls the galvannealing process

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： C. Schiefer F.X. Rubenzucker H.P. Jorgl H. Aberl Laboratory for Intelligent Control Methods for Process Technologies Institute for Machine and Process Automation Vienna University슠of슠Technology Vienna Austria Electrical Engineering and Process Control Research and DevelopmentDepartment TAW Voest-Alpine Industrieanlagenbau GmbH Linz Austria

High quality galvanized steel strip is a need of today's manufacturers of various products. In particular, in the top quality section steel strips for the automotive, building and consumer goods industries only those steel producers will be successful who are applying state-of-the-art process technologies. For this reason, VOEST-ALPINE Industrieanlagenbau mbH (VAI) and VOEST-ALPINE Stahl Linz developed a new galvannealing control system to optimize this metallurgical process. As the latest improvement of the galvannealing control strategy, a neural network controller has been developed by VAI in Cooperation with the Vienna University of Technology Christian Doppler Laboratory for Intelligent control Methods for Process Technologies. The paper describes the galvannealing process as far as it is necessary for the understanding of the controller functions, the controller structure and its essential functions. Furthermore, the neural network structure used and its integration into the controller system are explained. A discussion of simulation and practical operating results shows the improvements achieved by using a neural network controller in comparison to the conventional controller.

关键词： Neural networks Process control Steel Strips Electrical equipment industry Manufacturing industries Metals industry control systems Galvanizing Automotive engineering

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Hydraulically coupled power-plants commitment within short-term operation planning in mixed hydro-thermal power systems

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EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1997年第5期7卷 323-330页

作者： Rakic, MV Markovic, ZM [?]Dr. Milan V. Rakic (1938) received his electrical engineering degree in 1962 his M.S. degree in 1972 and his Ph.D. degree in 1993 from the University of Belgrade Yugoslavia. He made additional studies in operations research and system science at Stanford University Department of Operations Research Stanford/California USA and Western Reserve University System Research Center. Cleveland/Ohio USA in 1969/1970. He joined the Mihajlo Pupin Institute Department of Automatic Control Belgrade/Yugoslavia in 1962. He was engaged in large-scale system control studies and research. Since 1975 he has been working on the development of methods and software for power system operation planning. He is currently a senior research associate at the Mihajlo Pupin Institute. (Mihajlo Pupin Institute Volgina 15 POBox 15 11050 Belgrade Yugoslavia Phone: +381-11-773-503 Fax: +381-11-773-835)

A new method for short-term operation planning and power exchange scheduling of interconnected hydrothermal power systems is proposed in the paper. The criterion function is the total variable profit obtained sales of energy to customers within the system, exchange of energy with other systems, diminished by the cost of system operation. The method is based on Lagrangian relaxation, decomposition technique and successive solution of dual and primal problems. The dual and primal problems are decomposed and solved using appropriate optimization methods, while Lagrangian multipliers are corrected using subgradient method. Dual hydro subproblems are solved using linearization and network flow method. Special modification of the algorithm is made so as to enable commitment of hydro power plants, taking into account bilogical constraints on minimal flow of water downstream of the hydro power plant. The efficiency of the method is illustrated on a test problem.

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Developing a prototype concurrent design tool for composite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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High-dynamic AC machine control without speed or position sensor

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EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1996年第1期6卷 47-51页

作者： Zimmermann, W [?]Prof. Dri-Ing. Werner Zimmermann (1956) VDE. received his Dip1.-Ing. and Dr.-Ing. degrees in Electrical Engineering from the University of Stuttgart Germany. At the Institute for Power Electronics of the same University he worked in the field of electrical drives power electronics and control. In 1987 he joined Robert Bosch GmbH. As department manager he was responsible for the hardware and software development of electronic control units for diesel-powered passenger cars and trucks. Since 1993 he is Professor for computer and control engineering at Esslingen Polytechnic. He received the VDE-ETG prize for technical publications in 1989. (Fachhochschule fur Technik Esslingen FB Nachrichtentechnik Flandernstra Be 101 D-73732 Esslingen T +711/397-3749 Fax +7111397-3792)

In many applications inverter-fed AC machines with high dynamic performance are needed, but position control is not required. Conventional field-oriented control fulfils the dynamic requirements, but usually needs a costly position or speed sensor. Simple voltage-frequency control avoids these sensors, but will only achieve a moderate dynamic performance. For such applications a self controlled scheme based on the measured flux vector may be used. In this paper flux phase control loop and a method of backing the flux model with an observer to improve the behaviour at low stator frequencies are described.

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ASYNCHRONOUS TRANSFER MODE (ATM) OPERATION VIA SATELLITE - ISSUES, CHALLENGES AND RESOLUTIONS

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 211-222页

作者： CHITRE, DM GOKHALE, DS HENDERSON, T LUNSFORD, JL MATHEWS, N COMSAT Laboratories 22300 Comsat Drive Clarksburg MD 20871 USA. Received his B.Sc. from the University of Bombay India an M.A. in mathematics from the University of Cambridge U.K. and a Ph.D. in physics from the University of Maryland. He is currently an Associate Executive Director of the Network Technology Division at COMSAT Laboratories. He has been involved in research and development activities in ISDN VSAT networks data communications and network systems and architectures. Prior to his current positions Dr. Chitre was a Principal Scientist in the Network Technology Division at COMSAT Laboratories. Dr. Chitre joined COMSAT Laboratories in 1980. He has made major contributions to the analysis and architecture of data communication ISDN and BISDN via satellite. Dr. Chitre directs and participates in the international and national standards activities in ISDN BISDN and data communication as they apply to satellite communication. He was Chairman of the Working Group on Protocols and Network Timing Function of the CCIR/CCITT Joint Ad Hoc Group on ISDN-Satellite Matters during 1990–1992. Currently he is the Chairman of the Working Group on New Technologies in the ITU Intersector Coordinating Group (ICG) on Satellite Matters. Dr. Chitre was a programme manager during 1990 and 1991 on a contract from INTELSAT on systems studies on satellite communications systems architectures for ISDN and broadband ISDN systems. Currently he is the technical manager of the DoD Contract on ATM via satellite demonstration and the programme manager for the INTELSAT contract on analysis and top-level specification of INTELSAT ISDN subnetworks and SDH compatible transport network. Department manager for ISDN/Data Communications in the Network Technology Division of COMSAT Laboratories. His responsibilities include managing the implementation of next generation telecommunication systems for fixed and mobile satellite systems. Current projects include the development of a high data rate gateway switch that provides for the

Key issues regarding the operation of the broadband integrated services digital network (BISDN) via satellite are presented herein. The specific issues, challenges, and their resolutions are detailed. In particular, the impact of error characteristics and propagation delay on the operation of BISDN via satellite is discussed. Solutions are presented for removing adverse effects and providing high-quality service to users of BISDN via satellite.

关键词： ATM BISDN

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Tuning of a robust PID controller-application to heating process in extruder

Tuning of a robust PID controller-application to heating pro...

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IEEE Conference on control Technology and Applications (CCTA)

作者： J. Pulkkinen H.N. Koivo K. Makela Department of Electrical Engineering Control Engineering Laboratory Tampere University of Technology Tampere Finland Department of Research and Development Automation Products Nokia-Maillefer Oy Vantaa Finland

In this paper different methods are compared for tuning a robust PID controller for a heating process in an extruder. These tuning methods are internal model control, Clarke method, and Cohen & Coon method. Robustness is needed because the process is nonlinear. By using process model uncertainty the robust stability theorem is employed to assure that the feedback loop with the nonlinear process and the linear PID controller will be stable at all operating points. The model uncertainty is approximated with the help of a nonlinear physical model, which is based on heat balance equations. The controller parameters are selected to satisfy the requirement of the robust stability under model uncertainties.< >

关键词： Robust control Three-term control Temperature control Process control Heating Uncertainty Robust stability Robustness Feedback loop Linear feedback control systems

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SHIPBOARD DAMAGED STABILITY ASSESSMENT - THE FLOODING CASUALTY control software

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NAVAL ENGINEERS JOURNAL 1993年第3期105卷 152-166页

作者： ZAHN, PB ROSBOROUGH, J CARLSTROM, R Peter B. Zahn:is a section chief in the Naval Architecture Department at Advanced Marine Enterprises. He is responsible for software development and special trials support. He has led the Flooding Casualty Control Software (FCCS) development effort since joining AME in 1989. He is also responsible for the material handling strikedown and stowage (MHS&S) software development program as well as special trials support for the ACVLAP and T-AGOS 19 programs. Prior to joining AME Mr. Zahn spent nine years with various companies of the ARCTEC Group. His experience includes field trials in venues from the Caribbean to the Bering Sea as well as model tests and engineering design and development efforts. Mr. Zahn received his B.S. in naval architecture and marine engineering from Webb Institute in 1980 and has published various papers on pollution prevention offshore systems and icebreaker design and performance. He is a member of ASNE and SNAME. John Rosborough:has been a naval architect for the Naval Sea Systems Command (NavSea) for the past 15 years. He is currently assigned to the Hydrodynamics Division with responsibility for aircraft carrier stability evaluations and as a task leader for computer-aided ship design development. In the Stability Division he was previously responsible for stability analyses on various amphibious ships SWATHs and foreign ships. He manages the upgrade and augmentation of SHCP at NavSea and is the Navy's technical point of contact for evaluating shipboard stability software and transitioning technology to the fleet. Mr. Rosborough received his B.S. in naval architecture and marine engineering from the University of Michigan in 1977. He is a member of USNI and the Association of Scientists and Engineers at NavSea. Richard Carlstrom:is a naval architect with Advanced Marine Enterprises. He has been responsible for software development in support of a variety of major programs including FCCS and SHCP and is a specialist in stability evaluations for complex ships such as CVs CVNs

The Flooding Casualty control software (FCCS) was developed under the auspices of the Naval Sea Systems Command (NavSea) and is currently being deployed on a variety of ships in the neets of both the U.S. Navy and the U.S. Coast Guard. The primary objective of FCCS is to enable damage control personnel to identify critical stability conditions, especially when related to the loss of reserve buoyancy due to battle damage and the destabilizing effects of large quantities of firefighting water, in a timely manner. FCCS was initially deploved in 1990. It utilizes the standard algorithms of the Ship Hull Characteristics Program (SHCP). The user interface was designed to allow quick familiarity for shipboard users, primarily the damage control assistant (DCA) and his staff. Intact stability evaluations include the effects of topside icing, high winds, personnel crowding, heavy lifts over the side, high speed turns, and towing. FCCS also supports ballasting analysis for amphibious ships as well as providing bottom reaction and beached stability data for grounding incidents. Bv providing a tool for the ''fuel king'' and DCA to generate the required daily updates on the current ship load and liquids status, FCCS is assured of an accurate baseline in the event of damage. The design allows the evaluation of the ultimate ship stability status for a damage event using simple compartmentation and flooding status inputs. Evaluation of the adequacy of resulting stabilitv, as well as identification of such critical stability parameters as off center loading, margin line immersion, and negative GM, are accomplished by the program. Guidance is provided for the user to initiate appropriate flooding related damage control activities. Initially fitted on USS Oliver Hazard Perry Class frigates, FCCS databases have been for the USCG Hamilton class high endurance cutters, USS Arleigh Burke class Aegis destroyers, and a variety of other U.S. Navy and U.S. Coast Guard ship classes. The progra

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Function point analysis: evaluation of a software cost estimation model

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European Journal of Information Systems 1991年第4期1卷 229-237页

作者： Heemstra, F. J. Kusters, R. J. Department of Industrial Engineering and Management Science University of Technology Section Management Information Systems and Automation Research Group Estimation and Control of Software Development Eindhoven The Netherlands

The merits of function point analysis are discussed. Function point analysis was chosen because it is one of the most widely used aids for software cost estimation. In the analysis we use data from a large survey of Dutch organizations, from an experiment on the effectiveness of software cost estimation models and from a field study aimed at the adjustment part of the FPA model. Conclusions show that it is indeed widely used and that it performs reasonably well as a product sizer, but that the adjustment part of the model is less useful.

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Improved change tracking for software maintenance

Improved change tracking for software maintenance

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International Conference on software Maintenance (ICSM)

作者： J.K. Garland F.W. Calliss Software Tools Development Honeywell Industrial Automation and Control Phoenix AZ USA Department of Computer Science & Engineering Arizona State University Tempe AZ USA

The authors demonstrate the usefulness of change tracking information from the maintenance programmer's perspective. They split the data into logical groups and find the connections between these groups. They describe a method to incorporate problem-solving information in a change tracking database. Problem solving is discussed with regard to structured problem-solving techniques for isolating difficult problems. A relational database structure and queries to access the database are discussed. An example of how the change tracking system supports the maintenance problem-solving process is also included.< >

关键词： software maintenance Problem-solving software systems Relational databases Information analysis software tools History Computer errors Communication system control Computer industry

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