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International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： G.M. Dimirovski Yuanwei Jing Siying Zhang Institute of Automation & Systems Engg. Faculty of Electical Engineering SS Cyril and Methodius University Skopje Macedonia Department of Computer Engineering Faculty of Engineeing Dogus University Istanbul Turkey Institute of Control Theory School of Information Science & Engineering Northeastern University Shenyang Liaoning China

This paper addresses networking and traffic control problems in network systems along with the potential for introducing soft-computing applications at supervisory control level. The incentive Stackelberg strategy control concept was introduced to the networking model that comprises subsidiary systems of users and of network. A linear strategy is proposed for the elastic traffic problem, and results are demonstrated and illustrated via Kelly's (1997) example. The presented method is extended to the non-elastic traffic problem and results are also illustrated via a slightly modified Kelly example. Ways of employing combined analytical and soft-computing approaches and techniques in a hybrid framework have been investigated. A fuzzy-Petri-net supervisor is proposed to implement the strategic decision and control layer. Insofar obtained results are rather encouraging, and this research continues further towards possible implementation as well as some open theoretical issues.

关键词： Communication system traffic control control systems Intelligent networks Game theory Telecommunication control Traffic control Routing control system synthesis Supervisory control Pricing

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Feedback control for electromagnetic vibration feeder (application of two-degrees-of-freedom proportional plus integral plus derivative controller with nonlinear element)

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JSME International Journal, Series C: Mechanical systems, Machine Elements and Manufacturing 2001年第1期44卷 44-52页

作者： Doi, Tomoharu Yoshida, Koji Tamai, Yutaka Kono, Katsuaki Naito, Kazufumi Ono, Toshiro Department of Systems and Control Engineering Faculty of Engineering Osaka Prefectural College of Technology 26-12 Saiwai-cho Neyagawa Osaka 572-8572 Japan Department of System Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 Japan Research and Development Department Ishida Co. Ltd. 959-1 Shimomagari Ritto-cho Kurita-gun Shiga 520-3026 Japan Department of Mechanical Systems Engineering College of Engineering Osaka Prefecture University 1 1 Gakuen-cho Sakai Osaka 599-8531 Japan

An electromagnetic-type vibratory feeder of is a typical transportation device used in automatic weighers. As existing feeders are driven by feedforward control, the so-called "firing angle control", the driver cannot negate sudden disturbances. In this study, we consider applying a feedback control for such a feeder system. First, we give the two details of modelings for the vibration part and for the electromagnetic force part. Next, a feedback control system is constructed for the electromagnetic vibration feeder for which we propose a two-degrees-of-freedom proportional plus integral plus derivative (PID) controller with nonlinear elements. Next, we apply the feedback control to the feeder with a standard trough. Finally, we consider a method compatible with many varieties of troughs by adjusting a nonlinear element. On the basis of the results of some experiments, we confirm that the two-degrees-of-freedom PID control is more effective than the conventional firing angle control.

关键词： Mechanics

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Robust H∞ control for uncertain state-delayed linear systems with Markovian jumping parameters 6

Robust H∞ control for uncertain state-delayed linear system...

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6th European control Conference, ECC 2001

作者： Palhares, R.M. De Souza, C.E. Peres, P.L.D. Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Av. Dom José Gaspar 500 Prédio 4 Belo Horizonte MG30535-610 Brazil Department of Systems and Control Laboratório Nacional de Computação Científica - LNCC Av. Getúlio Vargas 333 Petrópolis RJ25651-070 Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 Campinas SP13081-970 Brazil

ISBN: (纸本)9783952417362

The problem of robust H∞ state-feedback control design for a class of continuous-time linear systems with Markovian jumping parameters and multiple time-varying delays at the states, and subject to uncertain parameters is addressed in this paper. It is assumed that the jumping parameters are available and the uncertain parameter belong to given convex bounded domains (polytope type uncertainty). A delay-independent sufficient condition assuring robust mean square stability and a prescribed level of H∞ disturbance attenuation for the closed-loop system is established in terms of linear matrix inequalities. © 2001 EUCA.

关键词： Linear matrix inequalities

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On the Structure of Singular Discrete Linear Repetitive Processes

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IFAC Proceedings Volumes 2001年第13期34卷 555-559页

作者： K. Galkowski E. Rogers D.H. Owens Institute of Control and Computation Enginrering Technical University of Zielona Gora Poland Dept. of Electronics and Computer Science University of Southampton Southampton S017 1BJ U.K. Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD U.K.

Repetitive processes are a distinct class of 2D systems of both theoretical and applications interest. They are characterized by a series of sweeps through a set of dynamics with explicit interaction between the outputs, or pass profiles, produced on successive passes. Their essential unique features are that (i) information propagation is over a finite duration in one of the two separate directions of information propagation; and (ii) the explicit interaction between successive pass profiles can lead to oscillations in the sequence of pass profiles that increase in amplitude in the pass to pass direction. In the case of processes with linear dynamics (either differential or discrete) a reasonably rich systems theory is available for models which are standard (or nonsingular). In this paper, we provide the first substantial results on discrete linear repetitive processes described by a singular state space model.

关键词： Repetitive dynamics discrete dynamics singularity 2D linear systems

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Self-organizing control of urban traffic signal network

Self-organizing control of urban traffic signal network

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IEEE International Conference on systems, Man and Cybernetics

作者： K. Sekiyama J. Nakanishi I. Takagawa T. Higashi T. Fukuda Department of Human and Artificial Intelligent Systems Fukui University of Technology Fukui Japan Dept. of Human and Artificial Intelligent Systems Fukui University Fukui Japan Computer Science Department University of Southern California Los Angeles CA USA Dept. of Micro System Engineering Nagoya University Nagoya Aichi Japan Automated Systems Division Murata Machinery LTD Inuyama Japan Center for Cooperative Research in Advanced Science and Technology Nagoya University Nagoya Aichi Japan

This paper proposes a self-organizing control strategy of a signal network for urban traffic flows. The signal network is described using a system of nonlinear oscillators with the nearest neighborhood coupling. The natural frequency, split and coupling constants of the signals are adjusted dynamically according to local information of traffic flows so that the desired network offset patterns are self-organized through mutual entrainment. We provide a preliminary analysis of the coupled oscillator system. Numerical simulations demonstrate the effectiveness of the proposed method under dynamical environmental changes.

关键词： Communication system traffic control Traffic control Oscillators control systems Frequency Mutual coupling Numerical simulation Centralized control Learning Humans

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A global exponential observer based on numerical differentiation

A global exponential observer based on numerical differentia...

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IEEE Conference on Decision and control

作者： S. Diop V. Fromion J.W. Grizzle Laboratoire des Signaux & Systèmes Supélec Gif-sur-Yvette France Laboratoired'Analyse des Systkmes et de Biométrie INRA Montpellier France Control Systems Laboratory Electrical Engineering and Computer Science Department University of Michigan Ann Arbor MI USA

ISBN: (纸本)0780370619

The extended Kalman filter is known to have excellent filtering characteristics, but its convergence is guaranteed only if it is initialized close enough to the true state value. Numerical differentiation based observers, on the other hand, may be designed to be globally convergent to a neighborhood of the true state value, but when the measurements are corrupted by significant uncertain signals their state estimates are delayed. In a previous work we proposed an observer design scheme for nonlinear systems which combines these two techniques to yield a globally exponentially converging observer. The necessity to implement an extended Kalman filter has two shortcomings. One is it does not apply when we face a system with an observability condition weaker than that the linearized dynamics about the estimated trajectory is completely uniformly observable. The other limitation is the computation burden. In this paper we propose an alternative which is still a global exponential observer. While the computation burden may not have been significantly reduced, definitely, it applies to a wider class of nonlinear systems. Noteworthy we prove that this global exponential observer is also bounded which is a feature the nonlinear observers in the literature rarely possess. The observer scheme is illustrated through a bioprocess example whose linearization is not completely uniformly observable.

关键词： State estimation Observers Delay estimation Nonlinear systems Observability Filtering Signal design Nonlinear dynamical systems Convergence Linear systems

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High frequency operation of a megawatt voltage source inverter equipped with ETOs

High frequency operation of a megawatt voltage source invert...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： K. Motto Yuxin Li Zhenxue Xu A.Q. Huang Power Control Systems Northrop Grumman Corporation Sykesville MD USA Power Managemen Analog Devices Inc.orporated San Jose CA USA Center for Power.Electronics System The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

ISBN: (纸本)0780366182

The fast switching speed, snubberless turn-off capability and voltage controlled turn-off property enable the emitter turn-off (ETO) thyristor the capability of high switching frequency-about 5-10 times as high as its GTO counterpart. A one-megawatt ETO-based voltage source inverter system is constructed with a switching frequency up to 3-5 kHz. Experimental results have shown that the ETO is a promising device for use in high frequency systems.

关键词： Voltage Inverters Thyristors Switching frequency Power semiconductor switches Snubbers Energy management Power system management Power conversion MOSFETs

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controlled Periodic Motion in a Nonlinear System with Impulse Effects: Walking of a Biped Robot

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IFAC Proceedings Volumes 2001年第6期34卷 429-434页

作者： F. Plestan J.W. Grizzle E.R. Westervelt G. Abba IRCCyN Ecole Centrale Université et Ecole des Mines de Nantes CNRS BP 92101 1 rue de la Noë 44321 Nantes cedex 03 France Control Systems Laboratory Electrical Engineering and Computer Science Department University of Michigan Ann Arbor MI 48109-2122 USA LGIPM Université de Metz IUT de Thionville Espace Cormontaigne 57970 Yutz France

The goal is to demonstrate a means to prove asymptotically stable walking in a planar, under actuated, five-link biped robot model. The analysis assumes a rigid contact model when the swing leg impacts the ground and an instantaneous double-support phase: under theses hypotheses, the robot is modeled by a dynamic nonlinear system and an impulse model. The controller induces finite-time stabilization of four of the robot's five degrees of freedom, resulting in a reduced Poincaré stability analysis that can be carried out by computing a one dimensional map.

关键词： Biped robot stable walking impulse effects Poincaré sections

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Robust H ∞ control for uncertain discrete-time state-delayed linear systems with markovian jumping parameters 1

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IFAC Proceedings Volumes 2001年第23期34卷 89-94页

作者： Reinaldo M. Palhares Carlos E. de Souza Pedro L.D. Peres Graduate Program in Electrical EngineeringPontifical Catholic University ofMinas Gerais Av. D. José Gaspar 500 30535-610 Belo Horizonte MG Brazil Department of Systems and Control Laboratório Nacional de Computação Científica - LNCCAv. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 13081-970 Campinas Sp Brazil

This paper addresses the problem of robust H ∞ state-feedback control design for uncertain discrete-time linear systems with multiple time delays at the states and Markovian jumping parameters. The jumping parameters are assumed to be available and the uncertainties are supposed to belong to convex bounded domains (polytope type uncertainty). Delay-independent sufficient conditions assuring robust stochastic stability and a prescribed H ∞ disturbance attenuation for the closed-loop uncertain discrete-time linear system with multiple time delays and Markovian jumping parameters are established in terms of linear matrix inequalities, which have the advantage that can be implemented numerically veryefficiently.

关键词： Robust H ∞ control time delay systems Markovian jumping parameters linear matrix inequalities discrete-time systems

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Fuzzy Adaptive Output Tracking control of a Class of Composite systems

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IFAC Proceedings Volumes 2001年第3期34卷 81-84页

作者： Bin Liu Yuanwei Jing Siying Zhang G.M. Dimirovski T.D. Kolemishevska Inst. of Control Science School of Information Science & Engg. Northeastern University Po. Box 321 Shenyang Liaoning 110006 P R. of China Department of Computer Engineering Faculty of Engineering DOGUS University Acibadem Kadikoy TR-81000 Istanbul Rep. of Turkey FAX#: + 90-216-327-9631 Inst.of Automation & Systems Engg. Faculty of EE SS Cyril #x0026 Methodius University Karpos 2 b.b. MK-91000 Skopje Rep. of Macedonia

In this paper the output-tracking problem of a class of composite nonlinear systems is studied. Composite system can be represented solely by models on the grounds of its inputs and measurable outputs. It is assumed that (i) the plant system belongs to aclass of composite non linear systems, and that the fuzzy logic control system applied can efficiently use adjustable parameters to approximate its non linear system function. The new theorem guarantees the synthesized indirect fuzzy adaptive control does ensure stable output tracking and possesses the ability to reduce the number of fuzzy rules.

关键词： Adaptive control composite systems fuzzy control MIMO systems nonlinear systems

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