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Considerations Concerning the Speed control of Electrical Drive Systems with Stepper Motors

IFAC Proceedings Volumes 1997年第27期30卷 455-460页

作者： Gheorghe Bãluṭă Ştefan Resmeriṭă Gheorghe Bäluṭă “Gh. Asachi” Technical University of Iasi Faculty of Electrical Engineering Electric Drives and Power Electronics Department Str. Horia No. 7-9 6600 Iasi Romania tel.032/112770 Ştefan Resmeriṭà “Gh. Asachi” Technical University of Iasi Faculty of Automatic Control and Computer Engineering Department of Automatic Control and Industrial Informatics Str. Horia No. 7-9 6600 Iasi Romania tel. 032/116502 tuiasi.ro

This paper presents a method for Stepper Motor (SM) speed control by means of a minor loop. The compatibility of the SM with the digital electronics allowed a PC to be used for implementing the control algorithm, the SM control being achieved by two hardware interface levels. The SM command is realized with two specialized circuits: L297 (SM controller) and L298N (driver). The control signals for this level are generated through a parallel port 18255 and a programmable timer 18253. Some other circuits complete the microprocessor interface. The software has the following tasks: speed measurement and control algorithm achievement of a PI type. To tune this controller the system characteristics are measured, when the system is unstable, having a relay instead of the PI part. There are treated aspects on choosing the sample period, the position transducer, and the type of speed measurement.

关键词： control applications control closed-loop Stepping motors Numerical algorithms computer controlled systems

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Analysis of deadlocks and circular waits using a matrix model for discrete event systems

Analysis of deadlocks and circular waits using a matrix mode...

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IEEE Conference on Decision and control

作者： F.L. Lewis S. Bogdan A. Gurel O. Pastravanu Automation and Robotics Research Institute University of Texas Arlington Worth TX USA Faculty of Electrical Engineering and Computer University of Zagreb Zagreb Croatia Department Automatic Control and Ind. Inf Polytechnic Institute Iasi Romania

A new matrix rule-based model of discrete-part discrete event systems is given that, together with the well-known Petri net marking transition equation, yields a complete matrix-based dynamical description of these systems. In this application to deadlock analysis, the exact relations between circular blockings and deadlocks are given for a large class of reentrant flow lines. Explicit matrix equations are given for online dynamic deadlock analysis in terms of circular blockings, and certain 'critical siphons' and 'critical subsystems'. This allows efficient dispatching with deadlock avoidance using a generalized kanban scheme. For the class of flow lines considered, the existence of matrix formulae shows that deadlock analysis is not NP-complete, but of polynomial complexity.

关键词： System recovery Discrete event systems Equations Dispatching Robotics and automation Petri nets Manufacturing Bills of materials Assembly Lifting equipment

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Intelligent controller design for the ship steering problem

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IEE PROCEEDINGS-control THEORY AND APPLICATIONS 1996年第1期143卷 17-24页

作者： Enab, YM Faculty of Engineering Automatic Control & Computer Engineering Department El-Mansoura University El-Mansoura Egypt

The reason for the present upsurge of interest in intelligent control is that the present generation of control systems are incapable, to a greater or lesser extent, of dealing with problems of a certain complexity. Fortunately, the human operator (HO) is often expert in keeping the complex control systems on the right track. In this paper a method for controller design has been investigated based on a concept of developing a mathematical model for HO behaviour. The method treats HO behaviour as a dynamic process by itself, transformed from the unknown dynamics of the ship to be controlled. The method of controller design entails observing the human controller, constructing a model of the human controller, and using that model as a basis for an automatic control system. During the observation phase the HO controls the ship and the data representing the state of the ship and human actions are registered. During the modelling phase, a human operator behaviour model (HOBM) is constructed as a neural network and its parameters are estimated. During the testing phase, the HOBM controls the ship and its performance is evaluated under the observation phase conditions and completely different conditions. The method has been successfully applied using computer simulation for the ship steering problem.

关键词： man-machine systems intelligent control neural networks learning systems

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Robust Fault Detection Using Index of Kullback Discrimination Information

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IFAC Proceedings Volumes 1996年第1期29卷 6524-6529页

作者： K. Kumamaru J. Hu K. Inoue T. Söderström Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820 Fukuoka Japan. Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O.Box 27 Uppsala Sweden

This paper presents a robust fault detection system (FDS) for dynamic systems with unmodeled dynamics. In the FDS, umnodeled dynamics is first qualified as soft bound, which as well as model parameters are estimated using a robust identification algorithm. Then as a fault detection index, Kullback discrimination information (KDI) is derived into a feasible form and an index of umnodeled dynamics is also introduced. A decision making scheme is thus developed so that fault detection is carried out based on the KDI, the index of umnodeled dynamics and other prior information about the system.

关键词： Fault detection parameter identification stochastic modeling robust estimation uncertainty

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Modelling, Adaptive, Neural and Fuzzy control of Coal Power Plants 1

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IFAC Proceedings Volumes 1995年第26期28卷 347-352页

作者： Petr Pivoňka Department of Automatic Control and Instrumentation Faculty of Electrical Engineering and Computer Science 61266 Brno Božetěchova 2 Czech Republic

At the preparatory stage for connecting the Czech power systems to the West European UCPTE system, corrections for frequency must be included in the output power control, i.e. the primary control must be introduced. The result of the detailed analysis was a model of primary output power control of the block and a new power system control of Czech coal power plants. In the new power system control, an adaptive or robust controller will be used for operation stabilisation

关键词： Power system control adaptive control neural control fuzzy control fuzzy PID controllers self-tuning control neural nets

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Development and application of MCAL tools for marine radar instruction

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computer Applications in engineering Education 1995年第4期3卷 259-259页

作者： Guirguis, S. Korany, E. Abdel-Bary, A. Institute of Graduate Studies and Research Alexandria University Alexandria Egypt Shawkat K. Guirguis:obtained the BSc and M.Sc. degrees in Computer Science and Automatic Control Faculty of Engineering Alexandria University in 1981 and 1984 respectively. In 1988 he obtained a PhD degree in Electronics and Communications Faculty of Engineering Cairo University co-supervised by the Imperial College of Science and Technology University of London where he spent two years as an academic visitor. His current research interests include software quality management multimedia automatic programming and decision support systems. He is currently a lecturer of Computer Science at the Institute of Graduate Studies & Research Alexandria University. Ezzat A. Korany:received the BS degree in Electrical Engineering (Electronics Section) from the University of Alexandria Egypt in 1971 the MS degree in Electrical Engineering (Computer Section) from Ain Shams University Cairo Egypt in 1977 and the PhD degree in Electrical Engineering (Digital Systems) from Florida Institute of Technology U.S.A. in 1982. He is currently an associate professor of Computer Science at the Institute of Graduate Studies & Research University of Alexandria. His research interests are in data communications and multimedia applications computer networks image processing and pattern recognition. Abdel-Latif A. Abdel-Bary:obtained the BEng degree in Electronics Technology from Arab Maritime Transport Academy in 1986. In 1995 he obtained the MSc degree in Information Technology from the Institute of Graduate Studies & Research Alexandria University. His current research interests include ICAL hypermedia and automatic programming.

In this article a multimedia computer-assisted learning (MCAL) system is presented. The major objective of this work was to investigate the potential of using such systems as tools for transferring instructional course information through various types of computer media as opposed to the classic CAL systems. The philosophy and techniques employed to design the system are investigated. Usage of the implemented system and its merits have been illustrated through its application to teach engineering students and technicians the theory and concepts of marine radar. System design, implementation, test, and revision phases are presented and discussed.

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Optimum pairing and ordering conditions for simultaneous reduction in total capacitance, sensitivity and output noise of cascade SC filters

Optimum pairing and ordering conditions for simultaneous red...

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1992 IEEE International Symposium on Circuits and Systems, ISCAS 1992

作者： Zhiqiang, M.A. Nakayama, Kenji Yamamoto, Gaishi Department of Electrical and Computer Engineering Faculty of Technology Kanazawa University Kanazawa920 Japan Faculty of Engineering Kanazawa Institute of Technology Ishikawa921 Japan Dept. of Automatic Control Engineering Central-South University of Technology Changsha China

ISBN: (纸本)0780305930

This paper presents optimum pairing and ordering (P/O) conditions for simultaneous reduction in total capacitance, sensitivity and output noise of cascade SC filters. First, investigating relations among conditions proposed for minimizing these three parameters independently, termed, CTmin, Smin and Nmin conditions, we make it clear that there is no P/O assignment with which the three parameters can be simultaneously minimized. Then we verify that Nmin condition is valid in reducing two other parameters. Trade-off optimum conditions are proposed by combining Nmin with Smin and CTmin. These conditions can limit the number of P/O assignments, in which an optimum P/O assignment for simultaneous reduction of three parameters can be searched out easily. Depending upon applications, the trade-off optimum condition can be slightly modified by adjusting the proportion of CTmin Smin and Nmin. Efficiency of the proposed trade-off optimum conditions is confirmed through computer simulation using several kinds of filters. © 1992 IEEE.

关键词： Capacitance

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Harmonic insertion in PWM inverter drive schemes

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European Transactions on Electrical Power 1992年第3期2卷 143-151页

作者： Theocharis, J. Petridis, V. Dr.-Ing. John Theocharis (1956) graduated as an Electrical Engineer from Aristotelian University of Thessaloniki.Greece in 1980. From 1980 to 1985 he has been with the scientific staff of the Department of Electrical Engineering at the Aristotelian University where he received the Ph.D. degree in 1985. Since 1986 he is working as a lecturer and in 1990 he became assistant professor at the Department of Electronics and Computer Engineering in the m e university. His research activities include control power electronics and electrical motor drives. Recently he is working with the Neural Network Systems with applications to field oriented control problems. Aristotelian University of Thessaloniki School of Engineering Faculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438 GR-Thessalonikil/Greece.T+3131/219784Fax + 3031/274868) Prof. Dr.-Ing. Vasilis Petridis (1946) graduated from National Technical University of Athens Greece in 1969.He obtained the M.Sc. and the Ph.D. in electronics and systems from the University of London in 1970 and 1974. respectively. H i s interests include applied automatic control neural networks drives dynamic systems robotics etc. He is currently professor in the Department of Electronics and Computer Engineering of the University of Thessaloniki. (Aristotelian University of Thessaloniki. School of EngineeringFaculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438. GR-ThessaloniW Greece T+3031/219784.Fax+3031/274868)

The procedure of harmonic insertion is generalized in this paper. Analytical expressions of the voltage spectra are derived. The insertion of the 3rd harmonic to the modulating signal, which is of particular interest, is considered as a special case. It is demonstrated in this case that the fundamental harmonic component of the phase and the line‐to‐line voltage is not affected by the insertion of the 3rd harmonic for sufficiently high values of the chopping ratio. However it has been shown that the higher harmonic spectrum is significantly improved as compared to the case of pure sinusoidal modulation. For different values of the fundamental component the optimal values of the amplitude of the third harmonic to be inserted have been calculated so that the distortion factor of the higher harmonic spectrum is minimized. Other cases of harmonic insertion are also considered which provide spectrum efficiency improvement. Experimental results are given which have been obtained by means of a microcomputer controlled PWM generator constructed for this purpose. Copyright © 1992 John Wiley & Sons, Ltd.

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A Fuzzy Inference Approach to Failure Diagnosis of Adaptive controlled Systems

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IFAC Proceedings Volumes 1991年第3期24卷 657-662页

作者： K. Kumamaru S. Sagara A. Nakai T. Söderström Department of Control Systems Engineering Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka Iizuka 820 Japan Department of Electrical Engineering Faculty of Engineering Kyushu University Fukuoka Hakozaki 812 Japan Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O. Box 27 Uppsala Sweden

An on-line scheme to failure diagnosis is proposed for dynamic systems under adaptive control, which is designed based on a direct approach to self-tuning regulator. Failure modes occurred in the system are assumed to be described by unexpected changes in physical parameters of the system. The parameter changes in the controlled system can effectively be detected by using Kullback Discrimination Information (KDI) as an index for model discrimination. In order to decide whether the detected system parameter change is caused by a failure or not, a fuzzy inference approach to failure decision is considered. Some appropriate membership functions which describe fuzzy events of failures are constructed to perform the fuzzy inference. In this way, useful knowledge about failure modes which is available from, e.g., experts can be introduced into the model- based diagnosis technique. Simulation studies of a second-order damped oscillator have been carried out to demonstrate the effectiveness of the method.

关键词： Adaptive control failure diagnosis fuzzy inference Kullback discrimination information parameter estimation

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A NEW CONCEPT OF THE SCARA ROBOT

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ROBOTICS AND computer-INTEGRATED MANUFACTURING 1990年第3-4期7卷 337-343页

作者： MILUTINOVIC, D POTKONJAK, V Mechanical Engineering Faculty Department of Production Engineering and Computer-Integrated Manufacturing Beograd University Yugoslavia Electrical Engineering Faculty Department of Automatic Control Beograd University Yugoslavia

Based on the SCARA concept, accepted worldwide, this paper considers the possibility of realizing SCARA with a full circle working area. The basis of the approach is a mechanism with two eccentrically positioned rotating discs instead of two joined links. In this way, apart from a circular working area and some other advantages, the installation of several tools (hands) is also facilitated. This paper analyzes the advantages of the proposed solution and the possibilities of its realization.

关键词： Robots, Industrial

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