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Design and Experimental Evaluation of a Multivariable Grinding Circuit control System

IFAC Proceedings Volumes 1983年第15期16卷 189-197页

作者： S.-L. Jämsä H. Melama J. Penttinen Technical Research Centre of Finland Finland Outokumpu Oy Finland Prodycon Oy Finland

The multivariable control that was designed for the primary grinding in the Vuonos concentrator can control important variables like the final particle size and the density of the cyclone feed. The controller was designed for the plant using an interactive CACSD-software package which included the use of the inverse Nyquist array method. The control algorithms designed were implemented in the control computer in Vuonos and there was good agreement between the simulated results and the full scale tests: Changes of the setpoint of either one controlled output variable produced satisfactory responses, while the other controlled output simultaneously remained close to the desired constant value. The multivariable controller designed has been taken into continuous use in Vuonos. Autocovariance and spectral density functions have been calculated in order to analyse the behaviour of the final particle size and the density of the cyclone feed. According to the results obtained in the design by the inverse Nyquist array method and the experiments at the Vuonos Mill, this technique is suitable for the design of multivariable control of grinding. A practical advantage of this design technique is the simplicity of the final controller and the use of standard control algorithms.

关键词： Multivariable control systems Inverse Nyquist Array method computer-aided control system design Grinding control engineering computer applications

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Optimization control for Combustion Air in Refuse Incinerators

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IFAC Proceedings Volumes 1983年第1期16卷 293-296页

作者： M. Kawahara K. Uosaki Technical Research Institute Hitachi Zosen Corporation Osaka Japan Faculty of Engineering Osaka University Osaka Japan

The direct optimization control method has many advantages in applications to real processes, though most of which are limited to be stationary. This report aims at a practical application of the direct optimization control to nonlinear non-stationary systems. A refuse incinerator plant has been taken as the object of control and a direct optimization control system has been constructed. The system consists of two stages: the optimization stage under constraints; and the correction stage of constrains themselves depending on the state; of process. It has been clarified that the proposed control method is expedient for application of the direct optimization control method to the control of non-stationary systems.

关键词： control engineering computer applications Hierarchical systems Industrial control Optimization Process control Time-varing svstems

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Design of a Distributed Data Acquisition and control System for a Thermoelectric Power Plant

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IFAC Proceedings Volumes 1982年第9期15卷 97-103页

作者： N.L. Benitez H.M. Carranza Electrical Research Institute Simulation Department P. O. Box 475 Cuernavaca Morelos Mexico

This paper describes the design and implementation of a Distribued Data Acquisition control System for a Thermoelectric Power Plant already in operation and controlled by conventional means. The system design is based on a two-level Hierarchical structure. The first level is defined by several distributed microprocessor-based remote stations that will perform most of the control tasks on a local basis. For a second level or Master station, a minicomputer is used to carry out coordination operations as well as to drive display terminals and other peripherals. Besides the availability and costs, the selection of the most adequate Data Acquisition and Process control equipment is based on considerations such as: the number of variables per local station, the volume of information to be transmitted, the type of communication to be used, speed of transmission, noise minimization, wiring costs and the maximum utilization of the intrumentation already installed and in operation. The existence of conventional control system in operation, suggests the implementation of our Distributed system in two stages. It is imperative that the plant not be shut-down at any moment. Therefore, the first stage would consist of the implementation of the Data Acquisition and Display system. The complementary stage will be the transition from the conventional control to a microprocessor-based distributed scheme. In this way, not only will a higher reliability be possible, but the operator/process communication will be enhanced and will provide flexibility for future expansion. Cet article décrit la conception et l'implantation d'un Systeme Distribué d'Adquisition de Données et de controle pour uno centrale Thermoelectrique en operation controlée per des moyens conventionnels. La realisation du systeme est basée sur une structure hierarchique a deuxneveux. Le premier niveau est defini par plusieurs stations a distance, controlée par microprocessours. Ces stations executera la mayorite des tach

关键词： Distributed control control engineering computer applications Data Acquisition Digital control Industrial control

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computer Based Process control System Which is Distributed, Hierarchical and Fully Redundant

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IFAC Proceedings Volumes 1982年第7期15卷 453-460页

作者： E.H.L. Derksen K. Buring Foxboro Nederland N. V. Koningsweg Soest The Netherlands

The described system uses the distributed architecture to achieve expandibility and reliability. The basic network security and communication tools are provided by the standard system software and hardware. The software structure which acts as the operating system for the multimaster hierarchy is written in BASIC with real time extensions. All system functions are table driven which means that modifications or expansions can be done without additional programming (fill-in-the-blanks). The potential problem of bus overload in a large multimaster network has been successfully handled. Redundancy is used at all levels to increase system reliability. The system has no back-up instrumentation. It has been in operation since mid 1981 to control a complex and critical batch plant. The objective to reduce operator staff has been achieved.

关键词： Distributed control hierarchical systems redundant control system control engineering computer applications batch process control computer control

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Ironies of Automation

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IFAC Proceedings Volumes 1982年第6期15卷 129-135页

作者： L. Bainbridge Department of Psychology University College London London WC1E 6BT UK

This paper discusses the ways in which automation of industrial processes may expand rather than eliminate problems with the human operator. Some comments will be made on methods of alleviating these problems within the 'classic' approach of leaving the operator with responsibility for abnormal conditions, and on the potential for continued use of the human operator for on-line decision-making within human-computer collaboration.

关键词： control engineering computer applications man-machine systems on-line operation process control system failure recovery

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Optimal Smoothing of Empirical Bode Plots by Hilbert Transform Reciprocation

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IFAC Proceedings Volumes 1982年第4期15卷 373-378页

作者： D. Zes W. Bass Hughes Helicopters Culver City CA 90230 USA Litton Guidance & Control Systems Woodland Hills CA 91365 USA

Measurement errors corrupting the data of an empirical Bode plot of a causal system (log-amplitude and phase, versus frequency) can be minimized by taking into account the theoretical redundancy of such data in the ideal (noise-free) case, wherein each plot is the Hilbert transform of the other. An explicit closed-form analytical solution of the problem of least-mean-square fit of reciprocal Hibert-transform pairs to the measured data is derived, and illustrative examples are presented.

关键词： Smoothing Bode diagrams data reduction and analysis Hilbert transforms automatic testing control engineering computer applications Fourier transforms frequency response filtering identification least squares approximations optimal filtering signal processing spectral analysers stochastic systems

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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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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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Adaptive Threshold Estimation for The Inspection of Hot Steel

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IFAC Proceedings Volumes 1982年第4期15卷 211-215页

作者： R.A. Fundakowski T.S. Levitt B.R. Suresh T.M. Wittenburg Honeywell Inc. Systems & Research Center 2600 Ridgway Parkway P.O. Box 312 Minneapolis Minnesota 55440 USA

This paper outlines a practical method of automating the threshold selection for segmentation in a real-time image processing system. This system has been developed to perform on-line surface inspection of hot steel slabs, thereby reducing substantially the energy consumption of the steel industry (largest single user in the U.S.). The threshold selection scheme has been designed to provide suitable clutter rejection while regulating the system processing backlog. The discussion proceeds along the line of adaptive threshold design rationale, system architecture constraints and the ensuing implementation. Performance of the adaptive threshold is compared to that of fixed threshold schemes.

关键词： Adaptive systems control engineering computer applications industrial control manufacturing processes pattern recognition signal processing steel industry steel manufacture digital image processing

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Interactive Blockorientated control by Microcomputer

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IFAC Proceedings Volumes 1982年第1期15卷 57-59页

作者： F. Haase Department of Electrical Engineering Ruhr-University Division for Control Engineering D-4630 Bochum Federal Republic of Germany

This paper describes the application of a commonly used microcomputer system based on the Motorola M6800 CPU to a widely userdefinable control concept. The structure of a control system is declared by a communication between user and microcomputer, and is composed in a blockorientated way using blocks for controllers, setpoints, summations, some nonlinearities etc. This allows a very easy realisation of any structure of a control system.

关键词： Digital control ergonomics control engineering computer applications

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