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Modelling and control of Water Supply Systems

IFAC Proceedings Volumes 1998年第20期31卷 543-548页

作者： Nedjeljko Perić Ivan Petrović Ante Magzan University of Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Končar-Electrical Engineering Institute Zagreb Croatia

A dynamical mathematical model of a water supply plant based on lumped parameters is described. A concept of its control system is proposed that ensures output pressure stabilisation under conditions of variable water consumption and variable water recourses. The control system consists of inner control loops which control the flow of each pump station and of a superimposed control loop that controls the output pressure of the water supply plant. The pressure controller calculates the cumulative reference value of the water flow for all controlled pumps and from this value an algorithm for the flow distribution calculates the reference flow for each inner loop, taking into account the level of water accumulation in each water well. control performances of output pressure obtained by a conventional PI controller and a fuzzy logic based controller are compared.

关键词： Large-scale systems Pressure control Flow control Pipelines Plants Mathematical models Fuzzy control

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A Semi-Empirical and a Neural Network Model of a Batch Plant Dynamics for Flexible Recipes control

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IFAC Proceedings Volumes 1998年第11期31卷 289-294页

作者： Srečko Milanič Rihard Karba Davorka Šel Nadja Hvala Stanko Strmčnik Faculty of Electrical and Computer Engineering Tržaška 25 1000 Ljubljana Slovenia fax: +386 61 126 46 31 “Jožef Stefan” Institute Department of Computer Automation and Control Jamova 39 1001 Ljubljana Slovenia

In order to apply a model based control strategy such as flexible recipes control to an industrial batch process, a model of the process dynamics is needed. This paper presents the modelling procedure for two such models: a semi-empirical and an artificial neural network model. Both models predict precipitation rates of TiO 2 particles in an industrial hydrolysis process. Model properties and their prediction accuracy is compared. The artificial neural network is trained using the augmented training data set approach. A simulator has been designed to study the application Of flexible recipe instructions.

关键词： modelling identification neural network models batch control model-based control

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Adriatic Sea noise spectrum measurement and polynomial approximation

Adriatic Sea noise spectrum measurement and polynomial appro...

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OCEANS

作者： D. Matika H. Ozbolt Ministry of Defense of the Republic of Croatia Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

Based on the research at the location "Middle Adriatic", the analysis of the noise spectrum of the Adriatic Sea is presented. The applied measurement method and necessary instrumentation, followed by the basic scheme of the measurement channel, are given. A representative Adriatic Sea noise spectrum for the particular location is given, with the sea state as a parameter. A regression analysis is made that led to an appropriate approximation polynomial of the spectrum.

关键词： Sea measurements Noise measurement Polynomials Frequency Low-frequency noise Wind speed control engineering computing Noise level Rain Ice

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Integration of Business and Production Levels in Process Industries

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IFAC Proceedings Volumes 1998年第15期31卷 797-802页

作者： Vladimir Jovan Janko Černetič Gregor Dolanc Jozef Stefan Institute Department of Computer Automation and Control Jamova 39 1001 Ljubljana Slovenia internet: http://www-e2.ijs.si/people/vladimir.jovan.html

Process control systems are operated more or less in isolation from business systems relating to the same plant. As the potential benefits of integration have become clearer. there have been several attempts to link process control and business control systems. One aspect of linking is described in this paper. A primary function of a process control system, which was in 1996 successfully installed in a Slovenian brick/work, is efficient control of the drying process in the factory. and so far this system is conceived as classic computer-based process control systenl. With regard to the possible need to incorporate this control system into a future CIM information system, a concept of flexible recipes was applied as a possible integration link between planning. which is a typical business-level activity, and process control which is a production-level activity. Flexible recipes thus may provide a modest contribution to the integration of shop floor control and logistical functions.

关键词： Factory automation computer integrated manufacturing lntegration Process control system Management system

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Specialized neural network and fuzzy logic algorithm in comparison for word frequency prediction in document filtering

Specialized neural network and fuzzy logic algorithm in comp...

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1998 IEEE International Conference on Fuzzy Systems, FUZZY 1998

作者： Baranyi, Péter Aradi, Petra Kóczy, László T. Gedeon, Tamás D. Dept. of Automation T. U. of Budapest Hungary Department of Systems and Control Engineering T.U. of Budapest Hungary Dept. of Telecommunication and Telematics T. U. of Budapest Hungary School of Computer Science and Eng. U. of New South Wales Australia

ISBN: (纸本)078034863X

For very large document collections or high volume streams of documents, finding relevant documents is a major information filtering problem. A major aid to information retrieval systems produces a word frequency measure estimated from some important parts of the document using neural network approaches. In this paper a fuzzy logic technique and as its simplified case a neural network algorithm will be proposed for this task. The comparison of these two and an alternative neural network algorithm will also be discussed. © 1998 IEEE.

关键词： Information retrieval systems

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Specialised neural network for learning synonyms and related concepts in large document collections

Specialised neural network for learning synonyms and related...

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International Conference on Knowledge-Based Intelligent Electronic Systems (KES)

作者： P. Baranyi P. Aradi L.T. Koczy T.D. Gedeon Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Hungary Department of Information Engineering University of New South Wales Sydney Australia Department of Automation Technical University of Budapest Budapest Hungary Department of Systems and Control Engineering Technical University of Budapest Budapest Hungary

For very large document collections or high volume streams of documents, finding relevant documents is a major information filtering problem. One of the main types of information retrieval systems produces a word frequency measure estimated by some important parts of the document using neural network approaches. This paper reports a new network structure for this task. It is specialised considering the main difficulties of these kinds of applications, namely, the calculation time complexity. It will be pointed out that the calculation, hence, the learning time is much reduced applying the new algorithm, however, the result is significantly improved compared to the former approaches, which offer a possibility to increase the number of considered words, hence, improve the effectiveness of information filtering systems.

关键词： Neural networks Intelligent networks Information retrieval Frequency estimation Frequency measurement automation Australia Information filtering Machine assisted indexing computer networks

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Axial flux circumferential current permanent magnet (AFCC) machine

Axial flux circumferential current permanent magnet (AFCC) m...

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

作者： Jian Luo Dinyu Qin T.A. Lipo Shuxiang Li Surong Huang Department of Electrical & Computer Engineering University of Wisconsin Madison Madison WI USA Beijing Institute of Control Devices Beijing China College of Automation Shanghai University Shanghai China

Based on the concept of power converter fed machines (CFMs), high power density machines with nonsinusoidal current and back EMF waveforms are attracting more and more research interest. In this paper, a novel type of axial flux circumferential current permanent magnet (AFCC) machine topology is introduced. A sizing equation analysis, finite element analysis, optimization of parameters, performance simulation, details of the prototype and test data are included. In addition, a comparison of the power densities between the AFCC machine and the traditional induction machine based on the sizing and power density equations is also provided. Alternative manufacturing arrangements and the method to reduce torque ripple are discussed.

关键词： Permanent magnets Equations Magnetic analysis Performance analysis Topology Finite element methods Analytical models Virtual prototyping Testing Induction machines

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Specialized neural network and fuzzy logic algorithm in comparison for word frequency prediction in document filtering

Specialized neural network and fuzzy logic algorithm in comp...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： P. Baranyi P. Aradi L.T. Koczy T.D. Gedeon Department of Automation TU Budapest Hungary Department of Systems and Control Engineering TU Budapest Hungary Department of Telecommunication and Telematics TU Budapest Hungary School of Computer Science and Engineering University of New South Wales Australia

关键词： Intelligent networks Neural networks Fuzzy logic Frequency estimation Frequency measurement Information retrieval Information filtering Information filters Machine assisted indexing Filtering algorithms

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Conceptual model for process control software specification

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MICROPROCESSORS AND MICROSYSTEMS 1997年第10期20卷 617-630页

作者： Godena, G J. Stefan Institute Department of Computer Automation and Control Jamova 39 1000 Ljubljana Slovenia

The paper presents a method for software specification in the domain of industrial process control. As a result of ever more demanding applications, particularly in the area of PLC based control, there is an emerging need for introducing methods that include an appropriate conceptual model and define the specification process. An approach to the method development is presented, based on an architectural extension of the Ward-Mellor structured real time software engineering method. The core of the method is a conceptual model of the equipment control specification, which consists of two essential parts: the first is that of process equipment entities, and the second is the functional part. The former is further decomposed in relation to two aspects of the process equipment entities: the structural aspect and the classification aspect. In order to make the conceptual model more clear some segments of the real process control application dealing with the hydrolysis process in the production of TiO2 are given. (C) 1997 Elsevier Science B.V.

关键词： process control software engineering methodology conceptual modelling

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Improvement of the Drying Process control in a Clay Product Plant

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IFAC Proceedings Volumes 1997年第6期30卷 1575-1580页

作者： Gregor Dolanc Vladimir Jovan Jozef Stefan Institute Department for Computer Automation and Control Jamova 39 1001 Ljubljana Slovenija

Clay products are formed by pressing raw clay bodies. The resulting green ware products contain a certain amount of water that varies around 20% by mass. Before entering the next production phase the water has to be removed from the green ware. This is attained by convection drying. Since the energy consumed in a drying process represents a significant part of the total energy consumed for production of clay products the optimisation of the drying process is especially sensible. We are focusing on the possibilities for reducing the energy consumption that are reached by introduction of a proper control of the process. Both theoretical and experimental analyses of the process serve for proper design of a control system, whose functions and the fmal goal are all finally proved in practice.

关键词： computer controlled systems Constraint problems Efficiency enhancement Energy expenditure Heat flows Multiloop control Temperature profiles

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