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1998 American control Conference, ACC 1998

作者： Henrion, Didier Šebek, Michael Tarbouriech, Sophie LAAS-CNRS 7 Avenue du Colonel Roche 31 077 Toulouse Cedex 4 France Trnka Laboratory of Automatic Control Faculty of Electrical Engineering Czech University of Technology Prague Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic Prague Czech Republic

ISBN: (纸本)0780345304

The problem of robust controller design is addressed for a single-input single-output plant with a single uncertain parameter. Given one controller that stabilizes the nominal plant, the Youla-Kucera parametrization of all stabilizing controllers and quadratic forms over Hermite-Fujiwara matrices are used to provide clear and simple geometric answers to the following questions: Can the plant be robustly stabilized by a nominally stabilizing controller? How can this robust controller be designed? Thanks to recent results on bilinear matrix inequalities, this geometric interpretation allows to state the equivalence between robust controller design and the concave minimization problem. © 1998 AACC.

关键词： controllers

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Polynomial Equations: A Tool for control Systems Synthesis

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IFAC Proceedings Volumes 1998年第18期31卷 263-268页

作者： V. Kučera Institute of Information Theory and Automation Academy of Sciences of the Czech Republic CZ-182 08 Praha Trnka Laboratory for Automatic Control Faculty of Electrical Engineering Czech Technical University CZ-166 27 Praha Czech Republic

Motivated by the pole placement design techniques, linear polynomial (or diophantine) equations have become a popular design tool of control engineers. The paper presents the theory, properties, and computational algorithms for the equation ax + by = c in a tutorial manner. Recent results are presented on the parametrization of limited degreee solutions, of relatively prime solutions, and of solutions x, y such that y/x is proper rational. Parametric and non-parametric computational algorithms are discussed in detail. Motivées par les méthodes de placement des pôles, les équations linéaires polynomiales (ou Diophantine) sont de venue un outil mathématique polulaire parmi les automaticiens. Cette communication a pour but de présenter, d'une manière synoptique, la théorie et le calcul numérique liés à l' équation ax + by = c. Plusieurs résultats récents sont présentés, sur la paramétrisation des solutions x, y de degré borné, sur les solutions x, y premières entre elles et sur les solutions telles que le rapport y/x est rationnel et propre. Plusieurs méthodes de résolution de cette équation, paramétriques ou non, sont discutées en détail.

关键词： Linear control systems pole assignment polynomial methods parametrization numerical solutions software tools

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Guided anti-tank missile control training simulator design via object-oriented modelling

Guided anti-tank missile control training simulator design v...

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UKACC International Conference on control '98 (Conf. Publ. No. 455)

作者： D.D. Mohenski G.M. Dimirovski S.M. Deskovski Department of Information & Control Systems U.S. Military Academy Skopje Macedonia ASE Institute Faculty of Electrical Engineering Ss Cyril and Methodius University Skopje Macedonia

A PC platform based training simulator for personnel on anti-tank guided missile (ATOM) systems has been designed and implemented as a complex system which is controlled by instructor-trainee interaction. It makes use of object oriented simulation modelling, a 6 DOF missile model and mask modelling of terrain and weather conditions. To cope with the system complexity, both a modular design of the system and its subsystems is adopted, and an object-oriented programming is applied. A fully elaborated set of compatible models and respective software implementations for missile and moving ground target involving their interrelated kinematics has been developed. An appropriate user-system interface has been designed to enhance instructor-trainee co-operation. It is aimed both for simulation studies of anti-tank combat (ATC) using command-to-line-of-sight (CLOS) guided missiles and for training operators of such systems. An implemented hardware-in-the-loop (HIL) element in the system is the real guidance system. Sample results for an experimental session with real-world data and situation are given.

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Circular blocking in flexible manufacturing systems: a matrix-based analysis

Circular blocking in flexible manufacturing systems: a matri...

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IEEE Conference on control Technology and Applications (CCTA)

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

The problem of deadlock in a large class of re-entrant flowline systems is analysed. Based on a Petri net (PN) model, circular blocking is rigorously defined and shown to be equivalent to part-path deadlock. The analysis is performed in terms of circular waits. Coupling the PN marking transition equation with the matrix rule-based controller equation yields a dynamical system representation, a framework in which algorithms of polynomial complexity can be developed for computing the structures of deadlock analysis. This allows efficient dispatching with deadlock avoidance using a generalised kanban scheme.

关键词： Flexible manufacturing systems System recovery Automatic control Equations control systems Polynomials Dispatching Routing Buffer storage Material storage

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Royal Academy of Medicine in Ireland - Section of Bioengineering - Proceedings of meeting held in Dundalk, Co. Louth, in February 1998.

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IRISH JOURNAL OF MEDICAL SCIENCE 1998年第4期167卷 256-276页

作者： [Anonymous] Orthopaedic Research Unit The Queen’s University of Belfast School of Biomedical Sciences The Queen’s University of Belfast Howmedica International Ltd. Raheen Industrial Estate Limerick Department of Mechanical Engineering Trinity College Dublin 2 Mater Hospital Dublin 7 Orthopaedic Research Laboratory Århus University Hospital Denmark University of Limerick Limerick Limerick Regional Hospital Raheen Limerick Boston Scientific Ireland Ltd. Galway Department of Mechanical Engineering University College Dublin Dublin Department of Electrical and Electronic Engineering University College Dublin Dublin Bioengineering Research Centre Department of Mechanical Engineering University College Dublin Dublin Northern Ireland Bio-Engineering Centre (NIBEC) School of Electrical and Mechanical Engineering University of Ulster Newtownabbey Department of Mechanical & Manufacturing Engineering The Ashby Building The Queen’s University of Belfast Johnson and Johnson Professional Orthopaedic Division Queensway England Department of Cardiology and Department of Medical Physics & Bioengineering St. James’s Hospital Dublin 8 Burke House Ellison Street Castlebar Royal College of Surgeons in Ireland Department of Surgery Beaumont Hospital Dublin Department of Electronic and Electrical Engineering Trinity College Dublin 2 Department of Aeronautical Engineering The Queen’s University of Belfast Vascular Unit Belfast City Hospital Department of Medical Physics and Bioengineering St. James’s Hospital Dublin 8 Centre for Biomedical Electronics Department of Electronic and Computer Engineering University of Limerick Limerick Department of Mechanical and Aeronautical Engineering University of Limerick Limerick School of Health Sciences University of Ulster Ireland School of Physiotherapy University of Ulster Newtownabbey Clinical Engineering NI Medical Physics Agency Belfast and Radiology Royal Victoria Hospital Musgrave Park Hospital University of Limerick Biomedical Institute (ULBMI) Uni

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Numerical Methods For Polynomial Matrix Rank Evaluation ⋆

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IFAC Proceedings Volumes 1998年第18期31卷 369-374页

作者： Didier Henrion Michael Šebek LAAS-CNRS 7 Avenue du Colonel Roche 31 077 Toulouse Cedex 4 France Trnka Laboratory of Automatic Control Faculty of Electrical Engineering Czech University of Technology Prague Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic 182 08 Prague 8 Czech Republic

Two algorithms are proposed for evaluating the rank of an arbitrary polynomial matrix. They rely upon constant matrix rank evaluations and therefore are more reliable than already existing elementary polynomial operations techniques. Some applications are mentioned, such as polynomial null-space extraction or conditions of existence of solutions to matrix polynomial equations arising in control problems. Deux algorithmes sont proposés pour évaluer le rang d'une matrice polynomiale quelconque. Ils sont basés sur des évaluations de rangs de matrices constantes et sont donc plus fiables que les techniques déjà existantes d'opérations polynomiales élémentaires. Quelques applications sont mentionnées, comme l'extraction du noyau polynomial ou des conditions d'existence de solutions aux équations polynomiales matricielles provenant de problèmes de commande.

关键词： Numerical algorithms Matrix polynomial equations

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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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Design of switched-capacitor oscillators composed of three phase-shifters

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第12期79卷 17-23页

作者： Miyazaki, T Nomiyama, T Horie, Y Yoshida, H Faculty of Engineering Kagoshima University Kagoshima Japan 890 Received the M.Sc. and the Dr.Sc. degrees in physics from Kyushu University in 1967 and 1979 respectively. From 1968 to 1988 he was a research assistant at the same university. He is now a professor in the Department of Electrical and Electronics Engineering Kagoshima University. He has been engaged in research on magnetic flux structures in superconductors on optical semiconductor devices and on measurement. He is a member of the Institute of Electronics Information and Communication Engineers of Japan the Physical Society of Japan and the Japan Society of Applied Physics. Received the M.Sc. degree in engineering from Kyushu University in 1993. He has been a research assistant in the Department of Electrical and Electronic Engineering since 1995. He has been engaged in research on photo-rechargeable batteries and on neural networks. He is a member of the Institute of Electronics Information and Communication Engineers of Japan and the Japan Society of Applied Physics. Received the M.Sc. and the Dr.Sc. degrees in physics from Kyushu University in 1986 and 1990 respectively. From 1987 to 1992 he was a research assistant at the same university. He is an associate professor in the Department of Electrical and Electronics Engineering Kagoshima University. He has been engaged in research on magnetic properties of superconductors and ultrasonic measurement. He is a member of the Institute of Electronics Infonnation and Communication Engineers of Japan the Physical Society of Japan the Japan Society of Applied Physics and the Japanese Society for Synchrotron Radiation Research. Received the M.Sc. and the Dr.Sc. degrees in engineering from Kyushu University in 1966 and 1979 respectively. From 1966 to 1980 he was a research assistant at the same university. He is a professor in the Department of Electrical and Electronics Engineering Kagoshima University. He has been engaged in research on automatic control. He is a member of the Institu

The problem in designing an automatic gain controller (AGC) for a low-frequency oscillator is to assure that the de voltage is related to the amplitude of oscillation. For a switched-capacitor (SC) oscillator composed of three SC phase-shifters, the capacitances yielding a de voltage proportional to the square of the oscillation amplitude are discussed. By the stated-variable method, the SC oscillator was analyzed to determine the conditions under which the outputs of three phase-shifters are equal in amplitude and different in phase by 120 degrees. When the condition is satisfied, the de voltage is obtained by summing the three squared outputs. An SC oscillator was designed based on the circuit analysis, and its performance agreed well with the analytical results. (C) 1997 Scripta Technica, Inc.

关键词： low-frequency oscillator automatic gain controller phase-shift oscillator switched capacitor state-variable method

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Optical fibre sensor for process tomography use on pneumatic conveyors

Optical fibre sensor for process tomography use on pneumatic...

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IEE Colloquium on Progress in Fibre Optic Sensors and Their Applications

作者： R.A. Rahim N. Horbury F.J. Dickin R.G. Green B.D. Naqlor T.P. Pridmore School of Engineering Information Technology Sheffield Hallam University Sheffield UK Control Dept Faculty of Electrical Engineering Universiti Teknologi Malaysia Malaysia Process Tomography Unit UMIST (University of Manchester Institute of Science and Technology) UK

Process tomography involves the use of instruments which provide cross-sectional profiles of the distribution of flowing materials in a process vessel or pipeline. The results in this paper demonstrate the suitability of low-cost optical fibre sensors for monitoring such flowing materials. In particular, the sensors' frequency bandwidth, when used to measure passing objects, is very high, typically tens of kilohertz. This high bandwidth makes them suitable for velocity measurement using cross-correlation techniques.

关键词： Conveyors Pneumatic systems Optical tomography Optical fiber transducers Fluid flow measurement

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FAULT-TOLERANT ASSOCIATE MEMORIES

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SYSTEMS AND COMPUTERS IN JAPAN 1995年第7期26卷 1-12页

作者： FUJIWARA, E TANAKA, T Member Faculty of Engineering Tokyo Institute of Technology Tokyo Japan 152 Eui Fujiwara:received his B.S. and M.S. degrees in Electronics Engineering in 1968 and 1970 respectively and his Dr. of Eng. degree in 1981 all from Tokyo Institute of Technology. In 1970 he joined the NTT Musashino Electrical Communication Laboratories and engaged in developing PIPS-1 and PIPS-11 computer systems. In 1988 he joined the Department of Computer Science Tokyo Institute of Technology as an Associate Professor. In 1990 he became a full Professor. He was a Visiting Professor at the Center for Advanced Computer Studies the University of Southwestern Louisiana from June 1985 to July 1986. His current research interests include coding theory for computers fault-tolerant memories VLSI defect-toleranceand WSI systems. He is a co-author ofError Control Coding for Computer Systems(Prentice-Hall1989) EssentiaLF of Error-Correcting Coding Techniques (Academic Press 1990) and other books. Dr. Fujiwara received the Young Engineer Award from the I.E.I.C.E. in 1978 and the Teshima Memorial Research Award in 1991. He is a senior member of the IEEE and a member of the Information Processing Society Japan. Associate Member

Because of its capability of high-speed search, the associative memory (CAM) is expected to be used in a variety of information processing systems. In this paper, novel fault-tolerant techniques which are effective for on-line use are proposed for TLB which is an example of the application of CAM. First, fault and error models of the TLB consisting of the CAM part and the SRAM part are clarified. Then, the fault-tolerant techniques for these faults and errors, such as distance separable technique, cod-ing technique, simplified 1-out-of-n check and graceful degradation, are proposed. The distance separable technique which encodes the data stored in the CAM part is the one which masks the faulty CAM part and prevents errors from propagating to the subsequent circuits. The coding technique checks the one-to-one correspondence between the data in the CAM and those in SRAM by using the SEC-DED code with byte error detection capability, i.e., SEC-DED-SbED code, and at the same time it detects and corrects errors in the data stored in SRAM. The simplified 1-out-of-n check processes association errors. The graceful degradation gives a flag in the faulty memory section and prevents it from being used. The methods proposed in this paper are evaluated from area augmentation and error detection capability perspectives. The results show that the fault-tolerant TLB with 32 virtual address bits, 32 physical address bits and 128 entries gives single fault detection probability of nearly 99 percent with 28 percent area increase.

关键词： CAM TLB DISTANCE SEPARABLE TECHNIQUE CODING TECHNIQUE SIMPLIFIED 1-OUT-OF-N CHECK GRACEFUL DEGRADATION

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