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Decoupling and Closed Loop Pole Placement via State and Output Feedback

IFAC Proceedings Volumes 1993年第2期26卷 795-798页

作者： L. Gören M. Güzelkaya Istanbul Technical University Electrical and Electronics Engineering Faculty Department of Control and Computer Engineering 80626 Maslak Istanbul Turkey

In this paper, decoupling and closed loop pole placement problem for square generalized systems are studied by regular static state and output feedbacks. The study is based on the previous results on decoupliog via state feedback in singular systems. The necessary and sufficient conditions on decouplability by output feedback is introduced and a theorem on assignable closed loop structures for simultaneously decoupled generalized systems is presented.

关键词： Linear systems Singular systems: Decoupling Matrix polynomial equation: Closed loop pole placement

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A method for recognizing character strings from maps using linguistic knowledge

A method for recognizing character strings from maps using l...

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International Conference on Document Analysis and Recognition

作者： A. Nakamura O. Shiku M. Anegawa C. Nakamura H. Kuroda Department of Electrical Engineering and Computer Science Faculty of Engineering Nagasaki University Nagasaki Japan Department of Control Engineering Sasebo National College of Technology Nagasaki Japan

It is difficult to recognize character strings from maps, which involve various figures. The authors describe a method for recognizing character strings from these topographical maps. The method consists of a bottom-up process and a top-down process. First, in the bottom-up process, character candidates are extracted from a map. Second, in the top-down process, these character candidates are grouped into strings using linguistic knowledge of strings. Through the top-down process, character strings are recognized correctly and efficiently from low precise character candidates extracted through the bottom-up process. The method was applied to 13 maps (512/spl times/512 pixels) involving 98 strings. As a result, 95% of 98 strings were extracted correctly.< >

关键词： Character recognition Roads Carbon capture and storage control engineering Knowledge engineering Data mining Buildings Educational institutions Image recognition Dictionaries

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Measurements of power and current components in unbalanced and distorted three‐phase systems

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European Transactions on electrical Power 1993年第1期3卷 75-83页

作者： Andria, G. Salvatore, L. Savino, M. Trotta, A. Dr. Gregorio Andria (1956) AEI received the M. S. degree in Electrical Engineering from the State University of Bari/Italy in 1981 and the Ph. D. degree in Electrical Engineering in 1987 from the same University. From 1981 to 1983 he was working in the Electrotechnics and Electronics Department of the University of Bari as a member of the research team on electrical measurements. From 1984 to 1986 he was a Doctoral Fellow and currently he is a researcher in the same department. His research interests are in the fields of electrical and electronic measurements on components and systems including digital measurements for the analysis of electrical quantities in non-sinusoidal systems and the design of integrated optical sensors for measurement and control of non-electrical physical quantities. (Department of Electrotechnics and Electronics Faculty of Engineering polytechnic of Bovia E. Orabona 4 1-70125 Bari. Italy T +3980/242266 Fax + 3980/242410) Prof. Luigi Salvatore (1945) AEI received the degree in electrical engineering from the University of Bari/Italy in 1970. Since 1976 he has worked in the Electrotechnical and Electronic Department of the same University as a member of the research team on electrical machines. From 1983 to 1987 he was a researcher of electrical machines in the same department. Since 1987 he has been an Associate Professor of electrical machines at the University of Bari. At the present time his research interests include the control monitoring and diagnostics of AC drives and the areas of signal processing anddigital measurements on power electronics systems. (Department of Electrotechnics and Electronics Faculty of Engineering Polytechnic of Bari via E. Orabona 4 I-70125 Bari Italy T + 3980/242258 Fax + 3980/242410) Prof. Mario Savino (1947) AEI received the degree in Electrical Engineering from the University of Barif Italy in 1971. Since then he has been working in the Electrotechnical Institute of Bari until 1973 as researcher from 1973 to 1982 as Assistant Profe

The paper deals with the instantaneous power theory in three‐phase circuits by using the instantaneous time phasors of voltage and current. Particularly it is shown that the instantaneous components of the current time‐phasor in a rotating reference frame p‐q, oriented in such a way that the instantaneous voltage time‐phasor points to the p‐axis direction, represent the active and reactive currents. These components give rise to instantaneous real and imaginary powers, respectively. The spectral analysis of the above‐mentioned time‐phasors gives the harmonic symmetrical components of positive and negative sequence of voltage and current three‐phase systems. The line‐by‐line product of the voltage sequence spectrum by the complex conjugate of the current sequence spectrum gives the DC components of the instantaneous real and imaginary powers. The paper shows also that the instantaneous active and reactive currents are different from those defined on grounds of the Fryze's theory, which can be determined from the voltage and current sequence spectra. Copyright © 1993 John Wiley & Sons, Ltd.

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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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On-Line Identification of Time Delay And System Parameters of Continuous Systems Based on Discrete-Time Measurements

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IFAC Proceedings Volumes 1991年第3期24卷 721-726页

作者： Z.Y. Zhao S. Sagara K. Kumamaru Department of Electrical Engineering Faculty of Engineering Kyushu University Hakozaki Fukuoka 812 Japan Department of Computer Science and Control Engineering Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan

A simple approach is presented for simultaneous on-line identification of the time delay and the system parameters of continuous-time systems based on discrete-time measurements. The linear integral filter is used both to construct the derivatives of input-output signals and to avoid estimating the unknown initial conditions. The time delay and the system parameters are directly estimated by an on-line algorithm which is derived using Newton’s method. Severed identification methods such as the bias-compensating method and the instrumental variable methods are applied for eliminating the asymptotic bias of the parameter estimates in noisy situations. The present algorithm is applicable to the case when the time delay is not an integral multiple of the sampling interval, and can also be used for model reduction.

关键词： Identification time-delay systems identification techniques model reduction

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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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Perspectives of the Wiener-Volterra approach to the modelling of ankle joint movement

Perspectives of the Wiener-Volterra approach to the modellin...

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Mediterranean Electrotechnical Conference (MELECON)

作者： A. Stefanovska D. Juricic Faculty of Electrical and Computer Engineering University of Ljubljana Ljubljana Slovenia Department of Computer Automation and Control Jozef Stefan Institute Ljubljana Slovenia

Dynamic modeling of the ankle joint is performed by means of the non-parameteric Wiener-Volterra approach. The original version is extended so that colored noise inputs can be handled. This is imposed from reality, i.e., all movements of the angle joint must be limited in frequency as well as in amplitude. Experiences related to the method are briefly summarized and supported with results obtained on a normal subject.< >

关键词： Muscles Foot Frequency Biological system modeling Hysteresis Colored noise Automation Automatic control control nonlinearities Electric variables measurement

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Interval Identification and Robust control Design: A New Perspective

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IFAC Proceedings Volumes 1991年第8期24卷 155-160页

作者： B. Shafai G. Sotirov Department of Electrical and Computer Engineering Northeastern University Boston MA 02115 USA Department of Process Control Faculty of Automatics Technical University. Sofia-l156 Bulgaria

This paper aims initially to present an identification method for constructing an interval model which can be aggregated to robust control design. Mathematical programming is used as a tool to achieve this goal. We, then, formulate necessary conditions for robust stability of continuous and discrete interval plants and seek low order controller candidates for both cases. Decision making strategies based on Kharitonov and Mansour-Kraus results are proposed to effectively construct and solve standard linear programming problems instead of interval ones. The so obtained candidates are cheked for guaranteed robust stabilizers using (generalized) edge or box theorems

关键词： Identification interval plants robust control stability mathematical programming

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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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