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IEEE International Conference on Industrial Technology (ICIT)

作者： P. Crnosija T. Bjazic R. Krishnan Faculty of Electrical Engineering and Computing Department of Control and Comp. Eng. in Automation University of Zagreb Zagreb Croatia The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

Traditional approaches to controller designs that guarantee fast compensation of load torque and reference variations result in design iterations and most of the time in poorer response for load torque variations. In this paper a reference model for desired drive behavior generation and optimization methods has been applied to achieve controller integral time constant lower than the maximum time constant of the PM brushless DC motor drive. Presented simulation results show that using reference model for desired drive behavior generation, it is possible to determine optimal controller parameters for faster (10 time) and better (2 time) load torque compensation than in the case of traditional design of speed controller parameters. Response due to reference input with constrained overshoot has been achieved using a filter in the servosystem input. Thereby, the proposed method demonstrates the design of a speed controller that is optimal for both load torque and reference variations and its verification with simulation are accomplished for a permanent magnet brushless dc motor drive.

关键词： Brushless DC motors Torque control Optimal control Time factors DC generators Optimization methods Magnetic separation Filters Servosystems Design methodology

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Lyapunov and Non-Lyapunov Stabilty of Linear Discrete Time Delay Systems

Lyapunov and Non-Lyapunov Stabilty of Linear Discrete Time D...

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International Conference on control and automation (ICCA)

作者： D.Lj. Debeljkovic M. Aleksendric N. Yi-Yong Q.L. Zhang Faculty of Mechanical Eng Department of Control Engineering University of Belgrade Belgrade Serbia Shenyang Institute of Automation Academia Sinica Shenyang China College of Science Northeastern University Shenyang Liaoning China

This paper extends some of the basic results in the area of Lyapunov (asymptotic) and finite time and practical stability to linear, discrete, time invariant time-delay systems. New definitions have been established for the latter concept of stability. Sufficient conditions for this type of stability, concerning the particular class of linear discrete time-delay systems are derived. More over the generalization of some previous results, in the area of Lyapunov stability for the same class of systems has been also established and proved.

关键词： Delay effects Asymptotic stability Sufficient conditions Lyapunov method

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Simulation of RFieldbus networks

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IFAC Proceedings Volumes 2003年第13期36卷 109-116页

作者： Elke Hintze Pavel Kucera Institut f. Automation und Kommunikation e. V. Magdeburg (ifak) Steinfeldstr. 3 D-39179 Barleben. Germany Brno University of Technology Faculty of Electrical Engineering and Communication Department of Control and Instrumentation Bozetechova 2 612 66 Brno Czech Republic

Driven by the demand on more flexibility in manufacturing and process automation systems. investigations are made in the field of wireless communication. In the R-FlELDBUS project a new wireless physical layer type was added to an existing fieldbus system. The resulting R-FIELDBUS systems allow adaptive architectures with mixed wired and wireless segments. To be able to analyse the functional and time behaviour of different configurations, a simulation model of the fieldbus system was also extended by the wireless behaviour. This paper describes the used simulation method. the models of the communication protocol as well as the new added wireless medium type as well as providing some first simulation results.

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Doping of Magic Nanoclusters in the Submonolayer In/Si(100) System

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Physical Review Letters 2003年第2期91卷 026104-026104页

作者： V. G. Kotlyar A. V. Zotov A. A. Saranin E. N. Chukurov T. V. Kasyanova M. A. Cherevik I. V. Pisarenko H. Okado M. Katayama K. Oura V. G. Lifshits Institute of Automation and Control Processes 690041 Vladivostok Russia Department of Electronics Vladivostok State University of Economics and Service 690600 Vladivostok Russia Department of Electronic Engineering Graduate School of Engineering Osaka University Suita Osaka 565-0871 Japan Faculty of Physics and Engineering Far Eastern State University 690000 Vladivostok Russia Research Center for Ultra-High Voltage Electron Microscopy Osaka University Ibaraki Osaka 567-0047 Japan

Si(100)4×3−In reconstruction is essentially a superlattice of magic (identical-size) Si7In6 nanoclusters. Using scanning tunneling microscopy (STM) observations, we have found that under appropriate growth conditions up to 35% of these clusters can be modified; namely, two Si atoms in the cluster can be replaced by two In atoms, thus forming a Si5In8 cluster. This modification can be considered as a doping of the magic cluster, as it changes the electronic properties of the cluster from semiconducting towards metallic. The doped cluster is less rigid than the ordinary one and swings in the electrical field of the STM tip. The atomic structure and stability of the doped magic cluster have been examined using first-principles total-energy calculations.

关键词： Nanostructured materials

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Composite systems control by combined math-analytical and FS/NN computing approach

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IFAC Proceedings Volumes 2003年第7期36卷 7-18页

作者： Georgi M. Dimirovski Yuan-Wei Jing Jun Zhao Si-Ying Zhang Dogus University Department of Computer Engineering Faculty of Engineering Acibadem Kadiköy TR-34722 Istanbul Turkey Fax# +90-216-327-9631 SS Cyril and Methodius University Institute of Automation & Systems Eng. Faculty of Electrical Engineering MK-1000 Skopje R. of Macedonia Northeastern University Institute of Control Science School of Information Science & Eng. Shenyang Liaoning P.R. of China Fax# +90-24-2389-0912

A control systems engineering approach, employing a two-level overall system architecture and different but compatible formalisms for system representation on the upper and lower levels, has been investigated in detail. One design alternative is based on employing fuzzy-system approximators and solving for the adaptive tracking of the given, arbitrary, desired system outputs. The other alternative is based on state equations of composite systems and the use of neural-network approximators to deal with uncertainties and control adaptation. In both alternatives similarity property of subsystems has been exploited. Both designs can be implemented within the standard computer process control technology, and are therefore believed to be promising in applied systems engineering.

关键词： Complex composite systems fuzzy systems neural networks nonlinear systems

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Input reconstruction by means of system inversion: Application to fault detection and isolation 15th

Input reconstruction by means of system inversion: Applicati...

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15th World Congress of the International Federation of Automatic control, 2002

作者： Szigeti, F. Bokor, J. Edelmayer, A. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 BudapestH-1111 Hungary Department of Control Engineering Faculty of Engineering University of Los Andes Mérida A.P. 11 La Hechicera Venezuela

ISBN: (纸本)9783902661746

This paper attempts to look at the fundamental problem of fault detection and isolation (FDI) in nonlinear systems. Using the idea of input reconstruction by means of dynamic inversion the authors first discuss the properties of input (or fault) observability in linear systems. The extension of the results to nonlinear systems as well as the mathematical conditions of the calculation of the inverse system, which provides the inverse in finite algorithmic steps, are given. The applicability of the inversion process to fault reconstruction in nonlinear systems is demonstrated. Copyright © 2002 IFAC.

关键词： Fault detection

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A reinforcement learning approach to obstacle avoidance of mobile robots

A reinforcement learning approach to obstacle avoidance of m...

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International Workshop on Advanced Motion control (AMC)

作者： K. Macek I. Petrovic N. Peric Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Croatia

One of the basic issues in the navigation of autonomous mobile robots is the obstacle avoidance task that is commonly achieved using a reactive control paradigm where a local mapping from perceived states to actions is acquired. A control strategy with learning capabilities in an unknown environment can be obtained using reinforcement learning where the learning agent is given only sparse reward information. This credit assignment problem includes both temporal and structural aspects. While the temporal credit assignment problem is solved using core elements of the reinforcement learning agent, solution of the structural credit assignment problem requires an appropriate internal state space representation of the environment. In this paper, a discrete coding of the input space using a neural network structure is presented as opposed to the commonly used continuous internal representation. This enables a faster and more efficient convergence of the reinforcement learning process.

关键词： Learning Mobile robots control engineering computing Automatic control Neural networks Fuzzy logic Path planning Robotics and automation Navigation State-space methods

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ATM available bit rate congestion control with on-line network model identification

ATM available bit rate congestion control with on-line netwo...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： D. Brscic I. Petrovic N. Peric Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

In this paper, the design of available bit rate (ABR) congestion control in ATM (asynchronous transfer mode) networks is considered. The goals of congestion control are high link utilization, low cell loss, and low network delay. Various algorithms for congestion control can be found in the literature. Most of them are based on a network model, which is assumed to be known. In this paper a recursive least square (RLS) algorithm for on-line identification of the network model is implemented and combined with a generalized predictive controller (GPC) and with an I-controller based on the Smith predictor. Simulations were carried out to prove the effectiveness of the proposed algorithms.

关键词： Bit rate Asynchronous transfer mode Traffic control Automatic control Communication system traffic control control design Bandwidth Switches Process control control engineering computing

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Experimental investigations of the rubber-asphalt sliding pair dynamics

Experimental investigations of the rubber-asphalt sliding pa...

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作者： Božić, Ante Petrović, Ivan Perić, Nedjeljko Matuško, Jadranko Poclain-Hydraulics Industrie Direction Technique B.P.N. 106 60411 Verberie Cedex France University of Zagreb Faculty of Electrical Engineering and Computing Department for Control and Computer Engineering in Automation Unska 3 HR-10000 Zagreb Croatia

ISBN: (纸本)0791836290

A laboratory model for experimental investigations of the rubber-asphalt sliding pair has been designed with the purpose of better understanding of dynamic behavior of the friction force in the contact patch between the car tire and the road. Its design is described and some experimental results are given. These results confirm that it is essential to use a dynamic friction model in order to describe friction force in contact between the car tire and the road. Moreover, they indicate that the existing dynamic friction models might be physically incorrect regarding the change of friction coefficient for an asperity bristle passing through the contact surface. Copyright © 2002 by ASME.

关键词： Tribology

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Milestone report coordinating committee on computer control 15th

Milestone report coordinating committee on computer control

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15th World Congress of the International Federation of Automatic control, 2002

作者： Verbruggen, Henk B. Park, Jaehyun Halang, Wolfgang Irwin, George Zalewski, Janusz Faculty of Information Technology and Systems Delft University of Technology Delft Netherlands Department of Automation Engineering Inha University Incheon Korea Republic of Faculty of Electrical Engineering Fern Universität Hagen Germany Intelligent Control and Systems Group School of Electrical and Electronic Engineering Queen's University Belfast United Kingdom Department of Electrical and Computing Engineering University of Central Florida Orlando United States

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