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Dynamic Process Flowsheet Simulation - An Important Tool in Process control

IFAC Proceedings Volumes 1987年第5期20卷 369-374页

作者： W. Marquardt P. Holl E.D. Gilles Institut für Systemdynamik und Regelungstechnik Universität Stuttgart D 7000 Stuttgart 80 Pfaffenwaldring 9 FRG

Comfortable tools for control system design and evaluation have gained increasing importance as useful aids in academia and industry. The limited nonlinear simulation capabilities of existing control system design packages are not sufficient for process and control system simulations. The development of detailed dynamic flowsheet simulators and their integration in a computer-aided design (CAD) environment is required for that purpose. The outline of the general purpose dynamic flowsheet simulator DIVA (Dynamische Simulation verfahrenstechnischer Anlagen), which is currently being developed at Universität Stuttgart is presented below. An illustrative simulation example of a chemical production plant will demonstrate the function and the possibilities offered by the simulator.

关键词： Dynamic process simulation process control modeling computer aided design control engineering computer applications

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Hierarchical Structure with Repetitive Goal Coordination for Real-time Flood control in a Multireservoir System

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IFAC Proceedings Volumes 1985年第14期18卷 111-119页

作者： K. Malinowski A. Karbowski Institute of Automatic Control Technical University of Warsaw ul.Nowowiejska 15/19 00-665 Warszawa Poland

The paper presents a hierarchical control structure for real time flood control in a multireservoir system. The aim of the structure is to minimize the flood damages which depend on the peak water levels at the most important locations situated far downstream the reservoirs. Water releases form the individual reservoirs are adjusted by the local operators while the objective of a central authority is to modify local performance functions so as to achieve his overall goals. Due to highly uncertain forecasting of future inflows the decision mechanism of a central dispatcher is based upon fast simulation of the system operation under different flow scenarios. An application of the control structure to a case study multireservoir system is shortly described together with some selected simulation results.

关键词： Analog computer applications control engineering computer applications control system synthesis flood control hierarchical systems large-scale systems on-line operations optimal control water resources

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Application of the Identification Techniques to the Ship System

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IFAC Proceedings Volumes 1978年第1期11卷 1583-1588页

作者： A. Tiano E. Volta Ship Automation Laboratory National Council of Researches Genoa Italy Department of Electrical Engineering Genoa University Ship Automation Laboratory National Council of Researches Genoa Italy

This paper seals with the identification experiments carried out in the recent vears by the L.A.N. (Ship Automation Laboratory) for determining a suitable mathematical model of the ship steering dynamics. Some basic concepts concerning the mathematical models are discussed, and the experimental methods as well as the results achieved by sea—trials performed on board of two shies with definitely different characteristics are presented. Such results, obtained after analysing a very large member of fall-scale experiments, confirm the adequacy of an A.R.M.A. model for describing the ship steering process.

关键词： Identification stochastic systems control engineering computer applications guidance systems ships

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Organization of the FMS Software

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IFAC Proceedings Volumes 1986年第2期19卷 123-129页

作者： V.A. Pavlov Department of Technical Cybernetics Leningrad Politechnic Institute Leningrad USSR

An organization of the software systems for the flexible manufacturing systems (SS FMS) is discussed. The generalized structure of the SS PI, IS is given. The functions of its subsystems are defined. The SS FMS developed nowadays at the Leningrad Politechnic Institute is oriented to the two-level structure of the computer control system. The software of the upper level computer solves the problems of the operative production planning and automated equipment operation dispatching. The software of the local control units is the lower level of the SS FMS, The structure of the algorithmic robot control system “Bars”, that is the base for the development of the software for the robotized production cells, transport robots and automated warehouses, is considered, The brief description of the problem-oriented language ROCOL, used for robot programming, is given.

关键词： computer control computer software control engineering computer applications integrated plant control production control programming languages robots flexible manufacturing systems

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Multivariable control of an Industrial Grinding Circuit

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IFAC Proceedings Volumes 1980年第7期13卷 311-322页

作者： D.G. Hulbert J. Koudstaal M. Braae G.I. Gossman National Institute for Metallurgy Private Bag X3015 Randburg 2125 South Africa Council for Scientific and Industrial Research P O Box 395 Pretoria 0001 South Africa Gold Fields of South Africa Limited P.O. Box 1167 Johannesburg 2000 South Africa

This paper describes the phases of identificatio a multivariable controller for use in an industrial plant, of the important output variables of a grinding circuit is hampered by the interaction between different variables, a generally not possible for these interactions to be elimin tional controllers. A pilot-plant study of a one-stage grinding circuit has sh control of a complex industrial circuit is feasible with a controller designed by the Inverse Nyquist Array method. This conclusion is further supported by a preliminary study carried out on tion of an industrial milling circuit in a gold extraction. The grinding circuit of the industrial plant, which consis mill and two pebble mills with classification by hydrocyclones, was fully instrumented, and a process-control computer was installed. Open-loop tests were carried out on the plant and the resu derivation of a dynamic model in the form of a matrix of transfer fuctions. The model was used to design a multivariable controller for the griding circuit.

关键词： Grinding Multivariable control systems Inverse Nyquist Array control engineering computer applications

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Real-Time Artificial Intelligence for Process Monitoring and control

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IFAC Proceedings Volumes 1988年第13期21卷 67-72页

作者： A.C. Thomson BP International Ltd. Britannic House Moor Lane London UK

Artificial Intelligence (AI) applied to the real-time control of process plants offers the possibility of assisting the operation of those plants. Typically AI can be used to control difficult processes and to monitor the state of the plant and advise the operator accordingly. British Petroleum has recognised the importance of this technology, and has initiated two projects in this field. The first has applied a rule-based controller to a lubricating oil refinery. The second employs an AI system to diagnose problems on a process plant.

关键词： Artificial Intelligence control engineering computer applications Diagnosis Process control Rule-based control

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Microprocessors in Real-Time control

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IFAC Proceedings Volumes 1982年第1期15卷 31-37页

作者： D.W. Clarke Department of Engineering Science Parks Road Oxford OX1 3PJ UK

Microprocessors are increasingly influencing both the theory and the practice of digital control. This paper briefly reviews the important current developments in microprocessor and related technologies, describes some typical microprocessor-based control systems and their applications, and attempts to assess some possible trends in this important area. Although the cost of raw computing power is now extremely low, the costs of system design, development and programming have not fallen by the same extent; this is shown to have a significant bearing on the viability of new control products and on the character of advanced theory which may become usefully employed in a microprocessor-based control system.

关键词： Adaptive control computer hardware computer software control engineering computer applications direct digital control integrated plant control micro-processors PID control

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The Three-Tier Grid control System of Hew;Concepts, Implementation, Experience

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IFAC Proceedings Volumes 1979年第5期12卷 266-273页

作者： L. Höhne D. Rumpel Network Operations Department Hamburgisehe Electricitäts-werke Hamburg Germany Department of Electrical Engineering Duisburg University Duisburg Germany

The 400/110/10 kV network of the Hamburgisehe Electricitätswerke (HEW) comprising 10 power plants, 61 substations and 6500 transformer kiosks is under on-line control from 5 centres on 3 operational tiers. The new computerized system for the 2 lower tiers shows novel features as for workflow organisation in the control rooms, data-amendment and protection. A mimic board was not applied. Due to these conditions, the system was designed from scratch, not using standard application software.

关键词： control engineering computer applications Man-machine systems Power distribution

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CAD of control Systems: Application of Nonlinear Programming to a Linear-Quadratic Formulation

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IFAC Proceedings Volumes 1983年第8期16卷 9-15页

作者： P. Fleming University College of North Wales Bangor Gwynedd UK

The familiar suboptimal regulator design approach is recast as a constrained optimization problem and incorporated in a CAD package where both design objective and constraints are quadratic cost functions. This formulation permits the separate consideration of, for example, modelfollowing errors, sensitivity measures and control energy as objectives to be minimized or limits to be observed. Efficient techniques for computing the interrelated cost functions and their gradients are utilized in conjunction with a nonlinear programming algorithm. The effectiveness of the approach and the degree of insight into the problem which it affords is illustrated in a helicopter regulation design example.

关键词： computer-aided design control engineering computer applications multivariable control systems nonlinear programming optimal control optimization

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Integral control Action and Separated Feedback control

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IFAC Proceedings Volumes 1982年第1期15卷 45-52页

作者： O.L.R. Jacobs Department of Engineering Science University of Oxford Parks Road Oxford UK

Integral control action is identified with the function of state-estimation in separated stochastic control. It follows that the separated controller structure could provide a basis for designing practical sub-optimal controllers which could be implemented using available on-line digital computers. Three case studies are summarised which confirm that separated controllers can reproduce integral action and can lead to substantial improvements in the control of difficult processes. The case studies include practical work on a laboratory-scale water-level control system, and simulation studies in connection with industrial collaborative work on pH control and with clinical collaborative work on feedback control of post-operative pain.

关键词： Bayes methods control engineering computer applications Kalman filter level control nonlinear filtering pain control pH control state estimation stochastic control

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