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SYMP ON LOW COST AUTOMATION

作者： COLOMBI, S ZOIA, R Swiss Federal Inst of Technology Lausanne Switzerland

This paper describes some powerful programs which are very useful for the design of digital controls. These programs work either on IBM personal computers and on VAX computers. This increases the potentialities of use... 详细信息

ISBN: (纸本)0080378668

关键词： control engineering computer applications MODELING controlLER CHOICE DIMENSIONING SIMULATION QUANTIZATION NONLINEARITY

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control of Fermentation Processes as Variable Structure Systems

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IFAC Proceedings Volumes 1991年第12期24卷 183-188页

作者： K.B. Konstantinov M. Kishimoto T. Yoshida International Center of Cooperative Research in Biotechnology Japan Faculty of Engineering Osaka University Yamada-oka Suita-shi Osaka 565 Japan

An essential pending problem in the modeling and control of fermentation processes is the variability of biological systems, expressed as predictable or unpredictable structural alterations in the control plant. Such phenomena, naturally or artificially induced, require flexible alteration of control system structure by proper switching to one or another control strategy. In order to overcome the rigid restriction imposed upon the plant structure by the conventional control approach, we propose here a two-level hierarchical scheme, which provides the control system with a kind of structural adaptability. In the second level of the system, which operates in the structural space of the plant and performs intelligent functions, the current plant structure is recognized as an element of a finite set of structures defined on the base of expert knowledge. In the first level, which works in the state space of the plant, the control strategy relevant to the current plant structure is picked out from a defined pool and the corresponding control action is calculated. This approach has been realized as a real-time software system intended for control of various fermentation processes.

关键词： Process control varying structures large-scale systems self-adjusting systems pattern recognition artificial intelligence control engineering computer applications fermentation processes fuzzy sets

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Slicot, A Subroutine Library in control and Systems Theory

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IFAC Proceedings Volumes 1991年第4期24卷 71-76页

作者： A. van den Boom A. Brown F. Dumortier A. Geurts S. Hammarling R. Kool M. Vanbegin P. Van Dooren S. Van Huffel Eindhoven University of Technology Eindhoven The Netherlands Numerical Algorithms Group (NAG) Ltd. Oxford UK State University of Ghent Ghent Belgium Philips Research Laboratory Belgium Louvain la Neuve Belgium Katholieke Universiteit Leuven Leuven Belgium

Past initiatives with respect to realising control libraries are analyzed. A new collaborative initiative is introduced. The design of a new control library SLICOT is presented and the first release of this library is... 详细信息

关键词： computer-aided control system design interactive computing control engineering computer applications control libraries

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Train Simulator

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IFAC Proceedings Volumes 1990年第2期23卷 155-161页

作者： S. Colombi Swiss Federal Institute of Technology Industrial Electronic Laboratory DE-Ecublens. 1015 Lausanne Switzerland

This paper describes a realtime digital train simulator which was realized to develop real braking devices. The main originalities of this simulator consists in the solutions introduced in order to allow a true simulation of the reality at reasonable price. In particular, in the modelling, we simplified the coupling static characteristics. This made it possible an analytic solution of the motion and coupling equations and therefore a reduction of the computing power requirements. On the other hand, to limit the hardware cost, we adopted a multiprocessor architecture where the simulation processors work in pipeline.

关键词： control engineering computer applications Modelling Nonlinear equations Numerical methods Convergence of numerical methods Multiprocessor architecture Parallel processing

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Batch Sequence control Using a Distributed control System with a Coordinator Station

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IFAC Proceedings Volumes 1989年第8期22卷 323-328页

作者： N. Akamatsu Y. Sakaki H-J Brass M. Tamaoka K. Matsunaga Systems Subdivision Engineering Division Yokogawa Electric Corporation 2-9-32 Nakacho Musashino-shi Tokyo 180 Japan

Current distributed control systems, having only control stations corresponding to each batch unit, may make it difficult to achieve proper control of processes, which incorporate simultaneously complex material transfers between units and sequence control over the entire process. In order to solve the above mentioned problem, we tried to introduce a new control station, called coordinator station, into the above processes. For those processes, necessary control functions are hierarchically divided, and this station is dedicated to the higher level function layer, which executes tasks such as coordination between units. This paper describes the basic design concept of batch control systems and function allocation when such a coordinated distributed control system is applied to the above processes. We also give two examples of typical applications to indicate the effectiveness of this control system and the applied design technique. Furthermore, our paper describes the check procedure used to evaluate system's communication performance, which is one of the keys to the effectiveness of this type of control system.

关键词： computer control control engineering computer applications control equipment batch sequence control distributed control system coordinated control food processing industry

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computer Aided Design of Digital controls

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IFAC Proceedings Volumes 1989年第18期22卷 165-170页

作者： S. Colombi R. Zoia Industrial Electronic Laboratory Swiss Federal Institute of Technology DE-Ecublens. CH 1015 Lausanne. Switzerland

关键词： control engineering computer applications modelling controller choice dimensioning simulation quantization non-linearity

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Computing Optimal controls for Systems with State and control Constraints

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IFAC Proceedings Volumes 1989年第2期22卷 67-72页

作者： I. Troch F. Breitenecker M. Graeff University of Technology Vienna Austria

Methods for computing optimal controls are reviewed and compared in view of their applicability for solving real world problems. Parametrization is presented as valuable and powerful tool to derive solutions being rea... 详细信息

关键词： control engineering computer applications Nonlinear programming Optimal control Optimisation State-space methods

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Feedforward control of Gas Recovery System for Oxygen Converters

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IFAC Proceedings Volumes 1989年第11期22卷 135-140页

作者： Lu Xin Automation Research Institute of Ministry of Metallurgical Industry P.O. Box 919 Beijing PRC

A comprehensive feedforward control algorithm (CFA) is presented for the Oxygen Gas Recovery (OG) system in LD steelmaking process. The control consideration is focussed on removing some problems unsolved in the other published control schemes. The control strategy is combined with implicit self-tuning algorithm (ISTA) and time series forecasting algorithm (TSFA). A special formula which reflects the metallurgical conditions inside vessels has been developed to ensure the efficient behaviour of ISTA and TSFA. Simulation results are also given. The possibility of further developed OG systems with less investment is discussed.

关键词： Steel industry Converters Gas recovery system control engineering computer applications Feedforward control Self-tuning control

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Automation of Copper Concentrate Smelters

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IFAC Proceedings Volumes 1989年第11期22卷 337-341页

作者： S.L. Retamai U.G. Larenas M.M. Sanchez Div. Sistemas-Sonda Ltda. Teatinos 574 Santiago Chile Depto. higenieria Metalúrgica Universidad de Comepción Casilla 53-C Concepción Chile

The main stages used in pyrometallurgical processes, to extract copper from its sulfide ores, which aproximately represent 90% of known copper minerals, are smelting and converting. Traditionally, the control of pyrometal1urgical plants has been done by manual control methods supported on operator's experience. This paper presents a description of smelting and converting processes, advances in their automation, functional specifications, and configuration of automation systems for copper smelters. Some introduced functions are data acquisition and processing, alarm messages, historical record and special algorithms for supervisory control. The special algorithms estimate the operational conditions of processes for different charge characteristic. Furthermore, we have estimated the benefits from application of automation systems at these plants.

关键词： control engineering computer applications energy control optimisation temperature control pyrometal1urgy process control

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Modeling and Simulation of a Power Plant Drum Boiler Combustion control System

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IFAC Proceedings Volumes 1989年第11期22卷 355-359页

作者： R.T. Pena L.A. Aguirre E.M.A.M. Mendes Depto. Engenharia Elctronica EEUFMG R. Espirito Santo 35 30160 Belo Horizonte MG Brazil

This paper describes a power plant combustion control system modeling and simulating work. The system is part of an integrated steel making plant, which belongs to Acominas, a company located in Minas Gerais State - Brazil. Three boilers, working in parallel, feed main steam, at 60 kgf/cm 2 - 485 C to a single steam collector drum. The combustion control system was designed in a boiler following strategy to burn, simultaneously, four different fuels. The boiler furnace combustion control system is, as usual, made out of two main control loops, fuel and air, that are interlocked. The combustion control system process was modeled using input-output type models, assuming a linear behavior for the plants in each control loop. The developed model was simulated in an IBM-PC XT compatible microcomputer. The simulation results show that the fuel control loops, under certain restrictions, can work all in automatic. Also, a new air fuel interlock strategy was modeled and showed good results in the simulation. The conclusions of this study are being successfuly implemented in the actual plant.

关键词： Power Plant Modeling Process control control engineering computer applications Steam Plants

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