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A phenomenological nonlinear multivariable controller for a pellet cooling process

IFAC Proceedings Volumes 2000年第22期33卷 167-172页

作者： Dominique Pomerleau Daniel Hodouin Eric Poulin GRAIIM (Groupe de recherche sur les applications de l’informatique à l’industrie minérale) Department of Mining and Metallurgical Engineering Université Laval Sainte-Foy Québec Canada G1К 7P4 Department of Automation and Process Control Breton Banville & Associates 375 Boul. Laurier Mont-St-Hilaire Québec Canada J3H 6C3

When process non-linearities are responsible for the deterioration of linear controller performances, usually the linear approximation of the model is updated as the operating conditions change. The alternative approach, which is used in this paper, is to directly incorporate the non-linear phenomenological simulator of the process into the controller. To assess the method, the control of a cooling zone of an iron oxide pellet-sintering furnace, a multivariable process containing strong gain variations, has been simulated. The structure of the predictive controller is based on the internal model control scheme. The observer part of the control loop uses the non-linear phenomenological dynamic model of the process, while the controller part uses either the steady-state or the dynamic non-linear model for output predictions.

关键词： Dynamic Modelling Predictive control Nonlinear control Model based control Nonlinearity

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Development and test of a 30 kVA superconducting generator

Development and test of a 30 kVA superconducting generator

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IEEE Winter Meeting Power engineering Society

作者： Myung Hwan Sohn Doh Young Park Jong Bo Ahn Seung Kyu Baik Young Kil Kwon Kang Sik Ryu Yong Joo Kim Kook Hun Kim Itsuya Muta Applied Superconductivity Research Group Korea Electrotechnology Research Institute Changwon South Korea Mechatronics Research Team Korea Electrotechnology Research Institute Changwon South Korea Control & Automation Group Korea Electrotechnology Research Institute Changwon South Korea Department of Electrical Engineering Kyoto University Kyoto Japan

A 3-phase, 30 kVA, 4 pole, 1800 rpm superconducting generator is built and tested. The field winding of the rotor is a racetrack type with NbTi superconducting wire. The rotor is composed of two dampers and a liquid helium container in which the field poles reside. The space between the outermost damper and the container is vacuum insulated. To continuously transfer the liquid helium from the stationary dewar into the rotor and return the helium gas conversely, a special coupling is installed. The stationary coupling is connected to the rotor through a ferrofluid seal. The open circuit characteristic (OCC) and short circuit characteristic (SCC) are obtained. Also, the test results under the light load (up to 3.6 kW) are given. From the design stage, 2-D FE analysis coupled with the external circuit has been performed. The external circuit includes the end winding resistance and reactance as well as two dampers. When compared with the test data, the FE analysis results show a very good agreement.

关键词： Superconducting filaments and wires Helium Coupling circuits Rotors Containers Circuit testing Iron Niobium compounds Titanium compounds Insulation

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Modelling and Identification with Rational Orthogonal Basis Functions

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IFAC Proceedings Volumes 2000年第15期33卷 445-455页

作者： Paul Van den Hof Bo Wahlberg Peter Heuberger Brett Ninness Jozsef Bokor Tomás Oliveira e Silva Department of Applied Physics Delft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands S3 - Automatic Control Royal Institute of Technology S-100 44 Stockholm Sweden. Department of Electrical and Computer Engineering The University of Newcastle Callaghan NSW 2308 Australia. Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1502 Budapest Hungary Dept. Electrónica e Telecommunicações University of Aveiro 3810-183 Aveiro Portugal

Decomposing dynamical systems in terms of orthogonal expansions enables the modelling/approximation of a system with a finite length expansion. By flexibly tuning the basis functions to underlying system characteristics, the rate of convergence of these expansions can be drastically increased, leading to highly accurate models (small bias) being represented by few parameters (small variance). Additionally algorithmic and numerical aspects are favourable. A recently developed general theory for basis construction will be presented, that is a generalization of the classical Laguerre theory. The basis functions are applied in problems of identification, approximation, realization, uncertainty modelling, and adaptive filtering, particularly exploiting the property that basis function models are linearly parametrized. Besides powerful algorithms, they also provide useful analysis tools for understanding the underlying identification/approximation algorithms.

关键词： System identification orthogonal basis functions series expansions model reduction parametrization

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An object-oriented knowledge-based system for intelligent start-up and diagnosis of fieldbus devices

An object-oriented knowledge-based system for intelligent st...

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1999 European control Conference, ECC 1999

作者： Bachmann, R. Rieger, P. Dresden University of Technology Department of Electrical Engineering Institute for Automation and Control Engineering Mommsenstr. 13 Dresden01062 Germany

ISBN: (纸本)9783952417355

The growing complexity of field devices and their use in even more complex fieldbus networks lead to various problems for the user. This paper presents a concept for an intelligent PC-based tool which can help users to handle these problems. The tool combines the advantages of object-oriented methodologies with a knowledge-based approach and a flexible fieldbus interface. The main aspects of implementation and use are discussed. © 1999 EUCA.

关键词： Expert systems

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Fuzzy tuning of PID controller based on genetic algorithm

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Systems Science 1999年第3期25卷 65-75页

作者： Xiong, N. Institute of Process Automation Department of Electrical Engineering University of Kaiserslautern Germany

PID controllers have found extensive industrial applications. The idea of online determination of the PID gains using fuzzy logic and reasoning was proposed with the purpose of acquiring better control performances than with using fixed PID parameters during the process. However, the detailed specification for such a fuzzy schedule is rather complicated and time consuming. Genetic algorithms are search algorithms based on natural selection and have proved themselves superior to conventional optimization techniques in many cases. This paper develops a genetic-based approach to designing a fuzzy system for online schedule of PID parameters. The effectiveness of the proposed approach in learning to adjust PID parameters for improving control performances has been demonstrated through simulation tests on a fourth-order process.

关键词： Three term control systems

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Dynamit - Learning system dynamics using multimedia

Dynamit - Learning system dynamics using multimedia

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1999 European control Conference, ECC 1999

作者： Lohl, T. Pegel, S. Klatt, K.-U. Engell, S. Schmid, Chr. Ali, A. Process Control Laboratory Department of Chemical Engineering University of Dortmund DortmundD-44227 Germany Department of Electrical Engineering and Information Technology Ruhr-University Bochum BochumD-44780 Germany

ISBN: (纸本)9783952417355

A CBT system for system dynamics and control engineering is presented and an introduction into the related educational aspects, the elements and their realisation is given. The system is based on multimedia web components, which integrate the MATLAB/MAPLE V system for calculations in the background. CACSD operation is completely hidden from the learner, which can concentrate on the tutorial, exercises and experiments. The latter are realised in an integrated virtual laboratory, which uses virtual reality techniques to animate and interact with virtual laboratory plants. © 1999 EUCA.

关键词： System theory

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Comparative analysis of Mamdani and Sugeno type fuzzy autopilots for ships

Comparative analysis of Mamdani and Sugeno type fuzzy autopi...

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1999 European control Conference, ECC 1999

作者： Vukic, Z. Velagic, J. University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Unska 3 ZagrebHR-10000 Croatia University of Sarajevo Faculty of Electrical Engineering Skenderija 70 SarajevoBH-71000 Bosnia and Herzegovina

ISBN: (纸本)9783952417355

In this paper a comparative analysis of Mamdani and Sugeno type fuzzy autopilots for ships is given. Both autopilots have two inputs: the heading signal and the yaw rate signal, and only one output: command rudder angle. Input variable fuzzification, fuzzy associative memory (FAM) rules, and output set defuzzification are described. The control system for the course-keeping composed of the nonlinear ship, the steering gear servo system, fuzzy autopilot and wave disturbance is described. Both autopilots are compared in three different sailing conditions: without wave disturbance, with wave disturbance and with wave disturbance and wave filtering. The notch filter was used for filtering of second-order wave disturbances. The influence of wave disturbance on course-keeping performance was analyzed. Even though the obtained performance in simulations are very similar, authors prefer Sugeno type fuzzy autopilot, due to less strain of the steering gear servo system and faster and more accurate heading obtained. © 1999 EUCA.

关键词： Ships

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A robust step response based plant identification for controller tunning

A robust step response based plant identification for contro...

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1999 European control Conference, ECC 1999

作者： Huba, Mikulas Zakova, Katarina Slovak University of Technology Faculty of Electrical Engineering and Information Technology Department of Automation and Control Ilkovičova 3 Bratislava812 19 Slovakia

The paper presents a new procedure for the system identification based on approximation of the plant step responses by PTnTd models. By simple examples, the method application in designing PID controllers is demonstra... 详细信息

ISBN: (纸本)9783952417355

关键词： Three term control systems

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Market-based control of complex dynamic systems

Market-based control of complex dynamic systems

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IEEE International Symposium on Intelligent control (ISIC)

作者： H. Voos Department of Electrical Engineering Institute of Process Automation University of Kaiserslautern Kaiserslautern Germany

The control of complex dynamic systems is one of the major tasks of modern control theory. The high dimensionality of complex systems often requires decentralized control concepts. In computer science, multiagent systems are proposed for use in distributed intelligent applications. To solve the common task, the single agents have to communicate and to interact in a suitable way. In the case of a resource allocation problem, so called market-based control algorithms can be used. Such algorithms imitate the behavior of human economies. Since most research in market-based control is done in the field of communication and computer networks, this work examines the application for the control of complex dynamic systems.

关键词： control systems Communication system control Application software control theory Distributed control Computer science Multiagent systems Resource management Humans Computer networks

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A measure for transparency in net based control algorithms

A measure for transparency in net based control algorithms

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IEEE International Conference on Systems, Man and Cybernetics

作者： G. Frey L. Litz Institute of Process Automation Department of Electrical Engineering University of Kaiserslautern Kaiserslautern Germany

In contrast to other areas of software design, in control applications the concepts of software quality following ISO/IEC 9126 standard are not very common. However, a primary goal in applying formal methods to controller design is the transparency of the resulting algorithm. An algorithm is said to be transparent if it is "easy and clear to see" what the controller does in the moment and what it will do in the next steps. In the paper the relation of this transparency concept to software quality is shown. Yet, the definition of transparency is vague and depends mainly on the subjective opinion on what "easy and clear to see" means. There are several aspects of a control algorithm that can be compared on an objective basis. In the paper the ability of different graphical controller design methods-finite automata, switching interpreted Petri nets (SIPN) and sequential function chart (SFC) according to IEC1131 standard-to describe an algorithm in a transparent way is compared. Furthermore, a number of criteria for transparency are given. These criteria cover different aspects such as number of comments, directionality and I/O-behavior. They are combined in a weighted sum to an automatically computable metric. The results of the presented method are twofold: first a set of rules for transparent controller design in the framework of SIPN and SFC is derived and secondly a metric which allows the comparison of the transparency of different control algorithms is achieved. The first result is interesting for the industrial application of the graphical design methods whereas the second result can be used for educational purposes and for optimization.

关键词： Automatic control Design methodology Software quality ISO standards IEC standards Algorithm design and analysis Software design Application software Software standards Automata

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