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Delay-dependent robust stabilization for a class ofneutral systems with nonlinear perturbations

控制理论与应用（英文版） 2007年第4期5卷 409-414页

作者： Ming LI Guangda HU Center of Control Theory and Guidance Technology Harbin Institute of Technology Harbin Heilongjiang 150001 China School of Information Science and Engineering University of Science and Technology Beijing Beijing 100083 China

This note deals with the problem of stabilization/stability for neutral systems with nonlinear perturbations. A new stabilization/stability scheme is presented. Using improved Lyapunov functionals, less conservative stabilization/stability conditions are derived for such systems based on linear matrix inequalities （LMI）. Numerical examples are provided to show that the proposed results significantly improve the allowed upper bounds of the delay size over some existing ones in the literature.

关键词： Delay-dependent criterion Robust stabilization/stability Linear matrix inequality （LMI） Neutral delaysystems State feedback stabilization Nonlinear perturbations

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A Novel Method Of controller Design For Simultaneous Stabilization And Performance Improvement Of An Electromagnetic Levitation System

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Asian Journal of control 2008年第4期9卷

作者： Subrata Banerjee T. K. Sunil Kumar Jayanta Pal Dinkar Prasad Department of Electrical Engineering Indian Institute of Technology Kharagpur India. T.K.Sunil Kumar:was born in 1974 at Calicut India. He received the B.Tech in electrical engineering in 1997 from N.S.S College of Engineering Palakkad (Calicut University) and M.Tech in Power System in 2001 from Regional Institute of Technology Jamshedpur (Ranchi University). Since 2001 he has been pursuing research work for his Ph.D in Electrical Engineering at Indian Institute of Technology Kharagpur. He is a life member of Systems Society of India. His main research interests includes application of control theory and computers to power system model order reduction genetic algorithm PID tuning random search optimization controller deign in 2-DOF configuration and interval systems. Emerson Network Power India.

This paper describes design and implementation of a control philosophy for simultaneous stabilization and performance improvement of an electromagnetic levitation system. An electromagnetic levitation system is an inherently unstable and strongly nonlinear system. To determine the overall closed loop stability for such a system, cascade lead-lag compensation has mostly been reported [1,2]. However, a single lead controller can not satisfy both stability and performance for such unstable systems [3]. Performance enhancement to satisfy the conflicting requirements of fast response with almost zero overshoot and zero steady state error has been successfully achieved by using a two loop controller configuration. The lead controller in the inner loop is designed to ensure stability while the outer loop PI controller is designed for performance enhancement. This approach decouples the twin requirements of stabilization (by the inner loop) and performance achievement (by the outer PI loop). The outermost PI controller has been designed using the ‘Approximate Model Matching’ technique [4]. The proposed control strategy has been implemented and the experimentation has been demonstrated successfully. Different experimental results have been included for verification.

关键词： Electromagnetic levitation lead-lag compensation approximate model matching control switched-mode DC to DC chopper model order reduction technique.

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Non-linear Analysis of Intracranial Electroencephalogram Recordings with Approximate Entropy and Lempel-Ziv Complexity for Epileptic Seizure Detection

Non-linear Analysis of Intracranial Electroencephalogram Rec...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Daniel Abasolo Christopher J. James Roberto Hornero Biomedical Engineering Group Department of Signal Theory and Communications University of Valladolid Valladolid Spain Signal Processing and Control Group Institute of Sound and Vibration Research University of Southampton Southampton UK

Epileptic seizures are generated by an abnormal synchronization of neurons unforeseeable for the patients. In this study we analyzed invasive electroencephalogram (EEG) recordings in patients suffering from medically intractable focal epilepsy with two non-linear methods, Approximate Entropy (ApEri) and Lempel-Ziv (LZ) complexity. ApEn and LZ complexity quantify the regularity and complexity of a time series, respectively, and are well suited to the analysis of non- stationary biomedical signals of short length. Our results show an increase in ApEn and LZ complexity values during seizures at the focal electrodes. These changes could also be seen at some extra focal electrodes. After the seizure ends, the values of both non-linear metrics return to values lower than those before the seizure. Moreover, we quantified the changes in LZ complexity, showing the complexity increase during the seizure and its notable decrease after its end. Our results suggest that these techniques are useful to detect changes due to epileptic seizures in the EEG.

关键词： Entropy Epilepsy Electroencephalography Brain Medical treatment Neurons Biomedical electrodes Biomedical measurements Video recording Band pass filters

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A gain scheduled controller for sinusoidal ripple elimination of AC PM motor systems

A gain scheduled controller for sinusoidal ripple eliminatio...

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Mediterranean Conference on control and Automation (MED)

作者： J. Wang W. C. Gan L. Qiu Department of Control Theory and Engineering Harbin Institute of Technology China ASM Assembly Automation Hong Kong Limited Hong Kong China Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Hong Kong China

An adaptive control algorithm for the elimination of torque and velocity ripples in the alternating current (AC) permanent magnet (PM) motor control systems is presented in this paper. A model of AC PM motor system includes n sinusoidal disturbances is first developed. The internal model principle (IMP) is then applied to design a controller to eliminate the torque and velocity ripples without estimating the amplitude and the phase values of the sinusoidal disturbances. Based on the IMP and the pole-zero placement technique, a gain scheduled (GS) robust two-degree-of-freedom (2DOF) speed regulator is developed to eliminate the torque and velocity ripples and to achieve a desirable tracking response. Using the small gain theorem, the system stability radius is obtained for n sinusoidal disturbances with slowly time-varying frequencies. The effectiveness of the proposed GS robust 2DOF speed regulator can be shown by the simulation results of an example with two sinusoidal disturbances.

关键词： control systems AC motors Permanent magnet motors Robustness Regulators Adaptive control Motor drives Torque control Velocity control Amplitude estimation

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Filtering of Discrete Linear Repetitive Processes with H and l2-l Performance

Filtering of Discrete Linear Repetitive Processes with H and...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Ligang Wu James Lam Wojciech Paszke Krzysztof Galkowski Eric Rogers Anton Kummert Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin P. R. China The University of Hong Kong Hong Kong Hong Kong China Institute of Control and Computation Engineering University of Zielona Góra Góra Poland School of Electronics and Computer Science University of Southampton Southampton U.K Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Germany

This paper considers the general filtering problem for a distinct class of two-dimensional (2-D) discrete linear systems, i.e. information propagation in two independent directions, known as discrete linear repetitive processes which are of both system-theoretic and applications interest. In particular, new results on the design of filters with guaranteed levels of performance are developed. These take the form of algorithms for the design of an H infin and l 2 -l infin dynamic output feedback filter which guarantees that the resulting filtering error process is stable and has prescribed disturbance attenuation performance as measured by H infin and l 2 -l infin norms.

关键词： Nonlinear filters Filtering Symmetric matrices Space technology Communication system control Attenuation measurement Algorithm design and analysis Iterative algorithms Optimal control Stability

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Single-photon quantum key distribution in the presence of loss

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Physical Review A 2007年第5期75卷 052336-052336页

作者： Marcos Curty Tobias Moroder Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical & Computer Engineering University of Toronto Toronto Ontario Canada M5S 3G4 Institute for Quantum Computing University of Waterloo 200 University Avenue West Waterloo Ontario Canada N2L 3G1 Quantum Information Theory Group Institut für Theoretische Physik I and Max-Planck Research Group Institute of Optics Information and Photonics Universität Erlangen-Nürnberg D-91058 Erlangen Germany

We investigate two-way and one-way single-photon quantum key distribution (QKD) protocols in the presence of loss introduced by the quantum channel. Our analysis is based on a simple precondition for secure QKD in each case. In particular, the legitimate users need to prove that there exists no separable state (in the case of two-way QKD), or that there exists no quantum state having a symmetric extension (one-way QKD), that is compatible with the available measurements results. We show that both criteria can be formulated as a convex optimization problem known as a semidefinite program, which can be efficiently solved. Moreover, we prove that the solution to the dual optimization corresponds to the evaluation of an optimal witness operator that belongs to the minimal verification set of them for the given two-way (or one-way) QKD protocol. A positive expectation value of this optimal witness operator states that no secret key can be distilled from the available measurements results. We apply such analysis to several well-known single-photon QKD protocols under losses.

关键词： SEPARABILITY CRITERION NONORTHOGONAL STATES COHERENT STATES CRYPTOGRAPHY PROTOCOL DIFFERENTIATE SECURITY THEOREM PROOF

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Preface

Lecture Notes in Control and Information Sciences

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Lecture Notes in control and Information Sciences 2007年第1期358卷 V-VI页

作者： Findeisen, Rolf Allgöwer, Frank Biegler, Lorenz T. Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 Stuttgart70550 Germany Chemical Engineering Department Carnegie Mellon University PittsburghPA15213 United States

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Methods and algorithms of multicriteria optimization on the basis of nonrigorous rankings of alternatives by partial criteria and experience of computer realization

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Journal of Automation and Information Sciences 2006年第1期38卷 24-35页

作者： Vassilyev, S.N. Kotlov, Yu.V. Russian Academy of Sciences Institute of System Dynamics and Control Theory Siberian Branch Russian Academy of Sciences Irkutsk Irkutsk Higher Military Aviation Engineering School Russia

We consider a class of problems of multicriteria selection, where final set of alternatives is known, a number of alternatives can be sufficiently great, they can be evaluated both quantitatively and qualitatively. Information about preferences is represented and generalized (with indication of equivalence) of ranking of alternatives. For the given class of problems we suggest computer technology of search of compromise solution, which uses qualitative criteria and new approach for solving problems of multicriteria selection. © 2006 by Begell House Inc.

关键词： Algorithms

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Wavelet chaotic neural networks and their application to optimization problems

Wavelet chaotic neural networks and their application to opt...

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3rd International Symposium on Neural Networks, ISNN 2006 - Advances in Neural Networks

作者： Xu, Yao-Qun Sun, Ming Duan, Guangren Center for Control Theory and Guidance Technology Harbin Institute of Technology 150001 Harbin China Institute of Computer and Information Engineering Harbin Commercial University 150028 Harbin China

ISBN: (纸本)354034439X

In this paper, we first review Chen's chaotic neural network model and then propose a novel wavelet chaotic neural network. Second, we apply them to search global minima of a continuous function, respectively. Meanwhile, the time evolution figures of the corresponding most positive Lyapunov exponent are given. Third, 10-city traveling salesman problem (TSP) is given to make a comparison between them. Finally we conclude that the novel wavelet chaotic neural network is more valid. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Neural networks

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Efficient FPGA implementation of equalizer for finite interval constant modulus algorithm

Efficient FPGA implementation of equalizer for finite interv...

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Industrial Embedded Systems - IES'2006

作者： Šucha, Premysl Hanzálek, Zdenek Hermánek, Antonín Schier, Jan Centre for Applied Cybernetics Department of Control Engineering Czech Technical University Prague Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic

ISBN: (纸本)142440777X

This paper deals with the optimization of iterative algorithms with matrix operations or nested loops for hardware implementation in Field Programmable Gate Arrays (FPGA), using Integer Linear Programming (ILP). The method is demonstrated on an implementation of the Finite Interval Constant Modulus Algorithm, proposed for 4G communication systems. We used two pipelined arithmetic libraries based on the logarithmic number system or the floating-point number system, using the widely known IEEE format for the floating-point calculations required in the algorithm. Traditional approaches to the scheduling of nested loops lead to a relatively large code, which is unsuitable for FPGA implementation. This paper presents a new high-level synthesis methodology, which models both, iterative loops and imperfectly nested loops, by means of the system of linear inequalities. Moreover, memory access is considered as an additional resource constraint. Since the solutions of ILP formulated problems are known to be computationally intensive, important part of the article is devoted to the reduction of the problem size. ©2006 IEEE.

关键词： High level synthesis

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