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Robust stability and H-infinity control for uncertain discrete-time Markovian jump singular systems

控制理论与应用（英文版） 2008年第2期6卷 133-140页

作者： Shuping MA Chenghui ZHANG Xinzhi LIU School of Mathematics and System Science Shandong University Jinan Shandong 250100 China School of Computer Science and Technology Shandong University Jinan Shandong 250061 China School of Control and Engineering Shandong University Jinan Shandong 250061 China Department of Applied Mathematics University of Waterloo Waterloo Ontario N2L 3G1 Canada

The robust stability and stabilization, and H-infinity control problems for discrete-time Markovian jump singular systems with parameter uncertainties are discussed. Based on the restricted system equivalent （r.s.e.） transformation and by introducing new state vectors, the singular system is transformed into a discrete-time Markovian jump standard linear system, and the linear matrix inequality （LMI） conditions for the discrete-time Markovian jump singular systems to be regular, causal, stochastically stable, and stochastically stable with 7- disturbance attenuation are obtained, respectively. With these conditions, the robust state feedback stochastic stabilization problem and H-infinity control problem are solved, and the LMI conditions are obtained. A numerical example illustrates the effectiveness of the method given in the oaoer.

关键词： Discrete-time singular system Markovian jump system Robust stability and stabilization H-infinitycontrol Linear matrix inequality（LMI）

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Constrained optimal control theory for differential linear repetitive processes

Constrained optimal control theory for differential linear r...

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IEEE Conference on Decision and control

作者： Michael Dymkov Eric Rogers Siarhei Dymkou Krzysztof Galkowski Belarus State Economic University Minsk Belarus School of Electronics and Computer Science University of Southampton Southampton UK Department of Applied Mathematics II Friedrich-Alexander-University of Erlangen-Nuremberg Erlangen Germany Institute of Control and Computation Engineering University of Zielona Góra Zielona Gora Poland

ISBN: (纸本)9781424431236

Differential repetitive processes are a distinct class of continuous-discrete two-dimensional linear systems of both systems theoretic and applications interest. These processes complete a series of sweeps termed passes through a set of dynamics defined over a finite duration known as the pass length, and once the end is reached the process is reset to its starting position before the next pass begins. Moreover the output or pass profile produced on each pass explicitly contributes to the dynamics of the next one. Applications areas include iterative learning control and iterative solution algorithms, for classes of dynamic nonlinear optimal control problems based on the maximum principle, and the modeling of numerous industrial processes such as metal rolling, longwall cutting, etc. In this paper we develop substantial new results on optimal control of these processes in the presence of constraints where the cost function and constraints are motivated by practical application of iterative learning control to robotic manipulators and other electromechanical systems. The analysis is based on generalizing the well-known maximum and ¿-maximum principles to them.

关键词： Constraint theory Optimal control Linear systems Iterative algorithms Electrical equipment industry Industrial control Metals industry Cost function Robot control control systems

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Predictive Direct Torque control for Induction Motor Drive

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AIP Conference Proceedings 2008年第1期1019卷 181-185页

作者： A. Benzaioua M. Ouhrouche A. Merabet aElectric Machines Identification and Control Laboratory (EMICLab) Department of Applied Sciences University of Quebec at Chicoutimi 555 Blvd de l'Université G7H 2B1 Chicoutimi (Qc) Canada bDalhousie University Department of Electrical & Computer Engineering 1360 Barrington Street B3J 2X4 Halifax (NS) Canada

A predictive control combined with the direct torque control (DTC) to induction motor drive is presented. A new switching strategy is used in DTC, where the constant switching frequency is taken constant, and the speed tracking is done by a predictive controller. The scheme control is applied to induction motor drive in order to perform the dynamic responses of electromagnetic torque, stator flux and speed. A comparison between the PI controller and predictive controller for speed tracking is done. Results of simulation show that the performance of the proposed control scheme for induction motor drive is accurately achieved.

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Computational issues of signal analysis in time domain

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WSEAS Transactions on computers 2007年第1期6卷 1-8页

作者： Hlupić, Nikica Basch, Danko Fertalj, Krešimir Department of Applied Computing University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 Zagreb 10000 Croatia Department of Control and Computer Engineering University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 Zagreb 10000 Croatia

This paper elaborates the present stage predictable direction of future development of Sine Wave Calculator (SWC), a simple method for signal analysis in time domain that provides accuracy comparable to the best classical methods (relative errors about few times 10-6). The main SWC advantages are extreme simplicity, possibility of selection of samples and straightforward calculations, which makes it preferable solution for quick implementation. The main shortage is still unknown mathematical analysis of errors, which are probably unequal for different signal parameters.

关键词： Spectrum analysis

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Modeling and control of PMSM drive using MRAC with signal adaptation algorithm

Modeling and control of PMSM drive using MRAC with signal ad...

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MIPRO 2007 - 30th Jubilee International Convention: computers in Technical Systems and Intelligent Systems

作者： Horvatic, Miroslav Ban, Zeljko Bjazic, Toni University of Applied Sciences J. Krizanica b.b. 42000 Varazdin Croatia Department of Control and Computer Engineering University of Zagreb Unska 3 HR-10000 Zagreb Croatia

ISBN: (纸本)9789532330304

The paper deals with modeling and control of the permanent magnet synchronous motor (PMSM) drive. The mathematical model of the drive with basic PI control loops is obtained from experimental data by parameter optimization. The model reference adaptive control (MRAC) algorithm with signal adaptation is adjusted for control of the drive in presence of the measuring noise. Algorithm parameters are obtained by computer optimization. Behavior of the control system is tested by computer simulation. © 2007 by MIPRO.

关键词： Permanent magnets

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On the Use of Fuzzy Texture Spectrum for Homogeneous and Textured Images Discrimination

On the Use of Fuzzy Texture Spectrum for Homogeneous and Tex...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Miquel Grau-Sanchez Eduard Montseny Pilar Sobrevilla Department of Applied Mathematics II Technical University of Catalonia Barcelona Spain Department of Computer Engineering and Automatic Control Technical University of Catalonia Barcelona Spain Eduard Montseny is with the Department of Computer Engineering and Automatic Control Technical University of Catalonia Barcelona Spain Department of Applied Mathematics II Technical University of Catalonia Barcelona Spain

Identifying the perceived qualities and properties of texture in images is an important step for image analysis, however the vague definition of texture has led to a huge variety of ways to analyze and characterize texture. In the ninetieths He and Wang (1990) proposed the use of the texture spectrum for extracting texture features. Recently we have developed a fuzzy-based texture spectrum coding approach, the fuzzy texture spectrum coding (Barcelo et al., 2006), in which a texture image could be described by the occurrence frequency function of all its fuzzy texture feature vectors. Later on, in the work of Barcelo et al. (2006), we proved the robustness of the proposed approach, particularly for representing homogeneity features. As an extension of our previous study on the analysis of the fuzzy texture spectrum coding for extracting texture features, in this paper we present the first results of our ongoing work for obtaining the classes encoded by the Reduced Fuzzy Texture Spectrum allowing to determine images' texture characteristics as well as the degrees to which these classes determine image's texture and homogeneity.

关键词： Image texture analysis Image analysis Image coding Feature extraction Image texture Helium Surface texture Statistics Image segmentation Frequency

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MULTI-ROBOT SYSTEMS: FROM FINITE AUTOMATA TO MULTI-AGENT SYSTEMS

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IFAC Proceedings Volumes 2007年第18期40卷 121-126页

作者： Doru Panescu ştefan Dumbrava “Gh. Asachi” Technical University of Iaşi Faculty of Automatic Control and Computer Engineering Department of Automatic Control and Applied Informatics Bd. D. Mangeron 53 A Iaşi Romania dorup@ac.tuiasi.ro sdumbrav@ac.tuiasi.ro

An attempt to connect finite automata theory with multi-agent systems is presented. The purpose is to obtain an accurate way to plan and control the robot activities within a multi-robot system. The proposed model is an adapted Moore machine, which is to be used with a contract net protocol agent coordination procedure. The considered architecture was tested in an educational flexible manufacturing system with two industrial robots.

关键词： Robotics multi-robot systems multi-agent systems robot programming finite automata flexible manufacturing systems

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Special Issue on Variable Structure System control — New Designs and Applications

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Asian Journal of control 2008年第4期5卷

作者： Prof. Jian-Xin Xu Prof. Leonid Fridman Department of Electrical and Computer Eng. National University of Singapore 4 Engineering Drive 3 Singapore 117576 Tel +65 6874-2566 Fax +65 6779-1103 Dr Jian-Xin Xu received his Bachelor degree from Zhejiang University China in 1982. He attended the University of Tokyo Japan where he received his Master's and Ph.D. degrees in 1986 and 1989 respectively. All his degrees are in Electrical Engineering. He worked for one year in the Hitachi research Laboratory Japan and for more than one year in Ohio State University U.S.A. as a Visiting Scholar. In 1991 he joined the National University of Singapore and is currently an associate professor in the Department of Electrical Engineering. His research interests lie in the fields of learning control variable structure control fuzzy logic control discontinuous signal processing and applications to motion control and process control problems. He is the associate editor of Asian Journal of Control member of TC on variable structure systems and sliding mode control of IEEE Control Systems Society and a senior member of IEEE. He has produced more than 90 peer-refereed journal papers near 160 technical papers in conference proceedings and authored/edited 4 books. Division de Estudios de Posgrado Facultad de Ingenieria National Autonomous University of Mexico DEP-FI UNAM Edificio “A” Circuito Exterior Ciudad Universitaria A. P. 70–256 C.P.04510 Mexico D.F. Mexico Tel +52 55 56223014 Fax +52 55 56161719 Dr. Leonid M. Fridman received his M.S in mathematics from Kuibyshev (Samara) State University Russia Ph.D. in Applied Mathematics from Institute of Control Science (Moscow) and Dr. of Science degrees in Control Science from Moscow State University of Mathematics and Electronics in 1976 1988 and 1998 respectively. In 1976–1999 Dr. Fridman was with the Department of Mathematics at the Samara State Architecture and Civil Engineering Academy Samara Russia. In 2000–2002 he was with the Department of Postgraduate Study and Investigations at the Chihuahu

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Improved Construction of Low-Density Parity-Check Codes Based on Lattices

Improved Construction of Low-Density Parity-Check Codes Base...

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International Symposium on Information Technology Convergence (ISITC)

作者： Xiongfei Tao Jong-man Kim Weizhong Liu Li Kong Department of Electronic Science & Technology Huazhong University of Science and Technology China Department of Electricity Applied Computer Namdo Provincial College Jeonnam South Korea Department of Control Science & Engineering Huazhong University of Science and Technology China

In this paper we construct a class of LDPC codes with girth 10 based on 2-D lattices. The parity check matrix is an incident matrix of lines and points in the lattices. By selection of slope sets, general triangles and quadrangles are removed in the lattices which leads to the corresponding codes have girth no less than 10. The codes are regular, whose column weight is 3. The generated check matrix have quasi-cyclic structure, and the codes show excellent bit error rate(BER) performance over A WGN channels.

关键词： Parity check codes Lattices Iterative algorithms Iterative decoding Computational geometry Information geometry Information technology Energy conversion Educational institutions AWGN channels

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Localized Multiple Next-hop Routing Protocol (LMNR)

Localized Multiple Next-hop Routing Protocol (LMNR)

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International Conference on ITS Telecommunications (ITST)

作者： Shekar Nethi Chao Gao Riku Jantti Mikael Pohjola Communications Laboratory Helsinki University of Technology Espoo Finland Department of Computer Science University of Vaasa Finland Department of Information Technology Vaasa University of Applied Sciences Vaasa Finland Control Engineering Laboratory Helsinki University of Technology Espoo Finland

In this paper we propose a novel reactive multi-path routing protocol for wireless (and vehicular) ad-hoc networks. The proposed scheme tries to establish and maintain local multiple paths to a certain destination, instead of finding multiple global paths between the source and destination nodes as most other multipath solutions do. To achieve this, we adopt and modify the well-known reactive routing protocol AODV. Using this scheme, source node and intermediate nodes are able to find a better next-hop dynamically when the network topology or traffic activity are changed. A cost function is given to let the related nodes to make decisions. NS-2 simulations show that our scheme gives significant improvement in terms of packet delivery ratio, routing overhead, and energy consumption.

关键词： Routing protocols Laboratories Cost function Energy efficiency Broadcasting Chaos computer science Information technology Maintenance engineering Ad hoc networks

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