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Robust H/spl infin/ filter design for uncertain linear systems with multiple time-varying state delays

IEEE Transactions on Signal Processing 2001年第3期49卷 569-576页

作者： C.E. de Souza R. Martinez Palhares P.L. Dias Peres Department of Systems and Control Laboratorio Nacional de Computacao Cientifica Petropolis Brazil Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil School of Electrical and Computer Engineering State University of Campinas-UNICAMP Campinas Brazil

The problem of robust H/spl infin/ filtering for continuous-time uncertain linear systems with multiple time-varying delays in the state variables is investigated. The uncertain parameters are supposed to belong to a given convex bounded polyhedral domain. The aim is to design a stable linear filter assuring asymptotic stability and a prescribed H/spl infin/ performance level for the filtering error system, irrespective of the uncertainties and the time delays. Sufficient conditions for the existence of such a filter are established in terms of linear matrix inequalities, which can be efficiently solved by means of powerful convex programming tools with global convergence assured. An example illustrates the proposed methodology.

关键词： Robustness Nonlinear filters Linear systems Filtering Time varying systems Asymptotic stability Uncertainty Delay effects Sufficient conditions Linear matrix inequalities

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A Comparison of Optimal Iterative Learning control Schemes

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IFAC Proceedings Volumes 2001年第14期34卷 77-82页

作者： M. Rzewuski E. Rogers D.H. Owens Dept. of Electronics and Computer Science University of Southampton Southampton SO17 IBJ UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD UK

Recent years has seen much progress in the theory and application of iterative learning control schemes for both linear and (classes of) nonlinear dynamics. In the case of the former, many algorithms based on minimizing a suitable cost function have been reported. Here the interest is in the so-called norm optimal approach where the basic philosophy is to compute the control input on the current trial such that the tracking error is reduced in an optimal way without too much deviation from the control input used on the previous trial. This paper compares the performance of a range of controllers arising from use of the norm optimal approach - both stand alone and against alternatives.

关键词： iterative learning control optimal algorithms

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A fuzzy backstepping controller for a pneumatic muscle actuator system

A fuzzy backstepping controller for a pneumatic muscle actua...

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IEEE International Symposium on Intelligent control (ISIC)

作者： P. Carbonell Z.P. Jiang D.W. Repperger Department of Systems Engineering and Control Polytechnic University of Valencia Alcoy Spain Department of Electrical and Computer Engineering Brooklyn Metrotech Center Polytechnic University Brooklyn NY USA HECP Air Force Research Laboratory OH USA

A nonlinear fuzzy backstepping controller is presented for set-point regulation of a pneumatic muscle actuator. Inflation and deflation are the two possible modes of operation of this actuator. Three fuzzy sets, one for each of both modes and one for the transition region, are considered. Each fuzzy set is associated with a local backstepping controller. At the inflation and deflation regimes, the associated controllers are exact backstepping controllers, whereas a robust nonlinear backstepping controller is used at the transition regime and deals with regime uncertainty. The use of fuzzy membership functions provides a smooth controller. The closed-loop system is globally and ultimately bounded.

关键词： Fuzzy control Fuzzy systems Backstepping control systems Muscles Pneumatic actuators Sliding mode control Nonlinear control systems Robust control Nonlinear dynamical systems

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On simulation based analysis and synthesis of hierarchical network sturctures 6

On simulation based analysis and synthesis of hierarchical n...

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6th European control Conference, ECC 2001

作者： Tanevska, Dijana J. Dimirovski, Georgi M. Stankovski, Mile J. Jing, Yuanwei Makedonski Telekomunikacii AD Orce Nikolov Str. b.b. SkopjeMK-91000 Macedonia Inst. of Automation and Systems Engg. Faculty of Electrical Engg. SS Cyril and Methodius University SkopjeMK-1000 Macedonia Department of Computer Engg. Faculty of Engineering DOGUS University Kadikoy-IstanbulTR-81010 Turkey Dept. of Automatic Control and Control Eng. School of Information Science and Engineering Northeastern University Shenyang Liaoning110006 China

ISBN: (纸本)9783952417362

Analysis of complex systems such as hierarchically structured network systems that are employed in modelling and analysis various aspects and issues of control and management in telecommunications is investigated. Theory of graphs and binary matrices appear to be most suitable tools for modelling the overall structure of complex systems, in general, and of systemic hierarchies, in particular. A systematic methodology has been developed for computer simulation analysis and detecting general hierarchies in communications networking as well as for synthesis of system hierarchies. This methodology is an improved extension of Warfield's technique. © 2001 EUCA.

关键词： Discrete event simulation

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Design and implementation of Automatic Parallel Detection Layer

Design and implementation of Automatic Parallel Detection La...

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IEEE International Conference on systems, Man and Cybernetics

作者： M. Ahamed H. Eldeeb S. Nassar N. Bagherzadeh Computer Science Mathematics Department Faculty of Science Cairo University Cairo Egypt Electrical and Computer Engineering University of California Irvine Irvine CA USA Computer & Control Department Electronic Research Institute Head of Parallel and Distributed Systems team Cairo Egypt Chair of Electrical and Computer Engineering University of California Irvine Irvine CA USA

We develop a new software layer called the Automatic Parallel Detection Layer (APDL) for the automatic transformation from sequential to parallel code. The main interest, in this research, is the parallelism at loop level, because significant parallelism in programs almost invariably occurs in loops. The proposed APDL has five processes for code transformation: the sequential source code parser, data dependence analysis of this code, partitioning, scheduling both task and data, and generating parallel source code. Many cases have been studied to evaluate the performance of the developed layer. The performance is evaluated depending on the execution time of: the sequential code, the parallel programmer code, and the code output from APDL for the same case study. Performance results show that APDL greatly improves the execution time with respect to sequential execution time, and saves on the high cost of a parallel programmer.

关键词： Parallel processing Concurrent computing Programming profession Electronic mail Program processors Distributed computing High performance computing computer science Automatic control Parallel programming

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Representing membership functions as elements in function space

Representing membership functions as elements in function sp...

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American control Conference (ACC)

作者： Man Lung Wong Yeung Yam P. Baranyi Intelligent Control Systems Laboratory Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong New Territories Hong Kong China Department of Telecommunications and Telematics Technical University of Budapest Budapest Hungary

This paper generalizes the geometric representation of membership functions comprising a finite number of characteristic points. An extended class of membership functions, satisfying certain monotonicity conditions, can now be expressed as elements in the space of square integrable functions. Specifically, bell-shaped membership functions, which were not possible before, can now be accommodated with this generalized representation. An example interpolation problem, treated using both the finite-dimensional approach and the generalized approach, is included for illustration.

关键词： Interpolation Marine vehicles Fuzzy sets Bismuth Lungs Intelligent control Laboratories Automation Telematics Artificial intelligence

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A resettable Kalman filter based on numerical differentiation 6

A resettable Kalman filter based on numerical differentiatio...

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6th European control Conference, ECC 2001

作者： Diop, S. Fromion, V. Grizzle, J.W. Laboratoire des Signaux and Systèmes Suéelec Gif sur Yvette Cedex91192 France Laboratoire d'Analyse des Systèmes et de Biométrie INRA Montpellier Cedex 134060 France Control Systems Laboratory Electrical Engineering and Computer Science Department University of Michigan Ann ArborMI48109-2122 United States

ISBN: (纸本)9783952417362

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 uncertain signals their state estimates are delayed. We propose, in this Communication, an observer design scheme for nonlinear systems which combines these two techniques to yield a globally exponentially converging observer. © 2001 EUCA.

关键词： Nonlinear systems

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A novel single-phase switched reluctance motor drive system

A novel single-phase switched reluctance motor drive system

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Annual Conference of Industrial Electronics Society

作者： R. Krishnan A.M. Staley K. Sitapati Motion Control Systems Research Group The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Custom Motor Solutions Group Kollmorgen Radford VA USA

Single phase switched reluctance machines (SRMs) have a special place in the emerging high-volume, low-cost and low-performance applications in appliances and also in high-speed low-power motor drives in various industrial applications. Single phase SRMs have a number of drawbacks: low power density as they have only 50% utilization of windings, lack of self-starting feature unless otherwise built in to the machine, most of the time with permanent magnets or sometimes with distinct and special machine rotor configurations or additional mechanisms. Many of these approaches are expensive or make the manufacturing process more difficult. In order to overcome such disadvantages, a method involving interpoles and windings is proposed in this paper. The proposed structure also provides four-quadrant operational capability with an appropriate converter. In addition to the proposed single phase SRM topology, a new and novel converter topology requiring only a single switch and a single diode is proposed. This enables for the first time a compact and low-cost single phase SRM. The present configuration, in addition, enables rotor position sensorless operation of the proposed single SRM drive system. Experimental results of the proposed SRM drive system are included.

关键词： Reluctance motors Reluctance machines Topology Switches Home appliances Motor drives Machine windings Permanent magnets Rotors Manufacturing processes

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Abnormal failure mechanism of the asymmetrical emitter turn-off thyristor in high-frequency converters

Abnormal failure mechanism of the asymmetrical emitter turn-...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Z. Xu K. Motto A.Q. Huang Center for Power Electronics System The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Power/Control Systems Northrop Grumman Corporation Sykesville MD USA

The emitter turn-off thyristor (ETO) is a new MOS-controlled thyristor that is suitable for use in high-power converters due to its improved switching performance and easy control. This paper analyzes the abnormal failures related to the parasitic diode of the ETO in high-frequency converters for the first time. To prevent this failure, several solutions are proposed and improved ETOs are developed. Experimental results show that the proposed solutions can properly solve this problem.

关键词： Failure analysis Thyristors Anodes P-i-n diodes Switches control systems MOSFETs Tail Switching loss Cathodes

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LMI based stability analysis and controller design for a class of 2D discrete linear systems

LMI based stability analysis and controller design for a cla...

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IEEE Conference on Decision and control

作者： E. Rogers J. Lam K. Galkowski S. Xu J. Wood D.H. Owens Department of Electronics and Computer Science University of Southampton Southampton UK Department of Mechanical Engineering University of Hong Kong Hong Kong China Institute of Conool and Compuetian Engineering University of Zielona Gora Poland CESAME Catholic University of bumin Belgium Department of Aulamatic Control and Systems Engineering University of Sheffield Sheffield UK

ISBN: (纸本)0780370619

Discrete linear repetitive processes are a distinct class of 2D linear systems with applications in areas ranging from long-wall coal cutting through to iterative learning control schemes. The main feature which makes them distinct from other classes of 2D linear systems is that information propagation in one of the two distinct directions only occurs over a finite duration. We give an LMI based interpretation of stability for the sub-class of so-called discrete linear repetitive processes, both open loop and closed loop under a well defined practically relevant control law, and then apply this theory to solve currently open problems relating to robustness and stability margins for these processes. Also it is shown that the LMI approach to the computation of the stability margins for these processes can be combined with a concept of a pole for them to link these margins to expected performance-a key feature which is missing from the analysis of stability margins currently available in the 2D systems literature.

关键词： Stability analysis control systems Linear systems Robust stability Optimal control System testing Ear Open loop systems Robust control Performance analysis

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