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International Workshop on Multidimensional (nD) systems

作者： L. Hladowski K. Galkowski E. Rogers A. Kummert D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland University of Wuppertal Germany School of Electronics and Computer Science University of Southampton Southampton UK Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Germany Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

Repetitive processes are a distinct class of 2D systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or 2D systems theory. Here we give the first results on how feedback/feedforward control action can be used to influence one form of controllability for processes with discrete dynamics.

关键词： Linear feedback control systems controllability Integrated circuit modeling control engineering computing Vectors Communication system control computer science systems engineering and theory State-space methods Multidimensional systems

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Generating multi-folded torus chaotic attractors

Generating multi-folded torus chaotic attractors

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International Conference on Physics and control

作者： Simin Yu Jinhu Lu Henry Leung Guanrong Chen College of Automation Guangdong University of Technology Guangzhou China Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy and Sciences Beijing China Department of Electrical and Computer Engineering University of Calgary AB Canada Department of Electronic Engineering City University of Hong Kong China

A systematic methodology for generating multi-folded torus chaotic attractors from a simple three-dimensional piecewise-linear system is presented in this paper. Theoretical analysis shows that multi-folded torus chaotic attractors can be created via alternative switching between two piecewise-linear systems. A novel circuit diagram is designed for physically creating multi-folded torus chaotic attractors. This is the first time in the literature to experimentally verify a maximum 9-folded torus chaotic attractor that is generated by an analog circuit.

关键词： Chaos Piecewise linear techniques Oscillators Laboratories Analog circuits Electric breakdown Bifurcation Educational institutions Automation automatic generation control

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Virtual attractive-repulsive potentials for cooperative control of second order dynamic vehicles on the Caltech MVWT

Virtual attractive-repulsive potentials for cooperative cont...

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American control Conference (ACC)

作者： B.Q. Nguyen Yao-Ling Chuang D. Tung Chung Hsieh Zhipu Jin Ling Shi D. Marthaler A. Bertozzi R.M. Murray Department of Electrical Engineering Vision Laboratory University of California Los Angeles Los Angeles CA USA Department of Physics Duke University Durham NC USA Department of Computer Science Vision Laboratory University of California Los Angeles Los Angeles CA USA Department of Electrical Engineering California Institute of Technology Pasadena CA USA Control and Dynamical Systems California Institute of Technology Pasadena CA USA Department of Mathematics Vision Laboratory University of California Los Angeles Los Angeles CA USA

We consider a motion planning method based on cooperative biological swarming models with virtual attractive and repulsive potentials (VARP). We derive a map between the model and fan speeds for the Kelly, a second order vehicle on the Caltech multi vehicle wireless testbed. The motion planning map results leads to the development and implementation of a point to point controller which is subsequently used as part of a cooperative searching algorithm. The VARP control method is scalable and can be used to organize a swarm of robotic vehicles.

关键词： Vehicle dynamics Motion control Biological system modeling Testing Open loop systems Motion planning Robot kinematics Remotely operated vehicles Equations Propulsion

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Transport of Mars-Crossing Asteroids from the Quasi-Hilda Region

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Physical Review Letters 2005年第23期94卷 231102-231102页

作者： Michael Dellnitz Oliver Junge Martin W. Lo Jerrold E. Marsden Kathrin Padberg Robert Preis Shane D. Ross Bianca Thiere Faculty of Computer Science Electrical Engineering and Mathematics University of Paderborn D-33095 Paderborn Germany Navigation and Mission Design Jet Propulsion Laboratory California Institute of Technology M/S 301-140L 4800 Oak Grove Drive Pasadena California 91109 USA Control and Dynamical Systems California Institute of Technology MC 107-81 Pasadena California 91125 USA Department of Aerospace and Mechanical Engineering University of Southern California Los Angeles California 90089 USA

We employ set oriented methods in combination with graph partitioning algorithms to identify key dynamical regions in the Sun-Jupiter-particle three-body system. Transport rates from a region near the 3∶2 Hilda resonance into the realm of orbits crossing Mars’ orbit are computed. In contrast to common numerical approaches, our technique does not depend on single long term simulations of the underlying model. Thus, our statistical results are particularly reliable since they are not affected by a dynamical behavior which is almost nonergodic (i.e., dominated by strongly almost invariant sets).

关键词： .graph orbits partitioning week ending Asteroids Preis Mars-Crossing Quasi-Hilda

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Excitation of terahertz plasma oscillations in a field-effect heterostructure device by ultrashort optical pulses: Physics and modeling

Excitation of terahertz plasma oscillations in a field-effec...

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International Conference on Ultrafast Phenomena, UP 2004

作者： Ryzhii, V. Khmyrova, I. Ryzhii, M. Satou, A. Otsuji, T. Shur, M.S. Computer Solid State Physics Laboratory University of Aizu Aizu-Wakamatsu965-8580 Japan Department of Control Engineering and Science Kyushu Institute of Technology Iizuka820-8502 Japan Department of Electrical Computer and Systems Engineering Rcnssclaer Polytechnic Institute Troy12180 United States

We report on the proposal and modeling of a heterostructure device similar to a field-effect transistor using optical excitation of electron plasma oscillations and intended for generation of terahertz signals. ©... 详细信息

ISBN: (纸本)3540241108

关键词： Field effect transistors

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First step toward Internet based embedded control system

First step toward Internet based embedded control system

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Asian control Conference

作者： E. Suwartadi C. Gunawan A. Setijadi C. Machbub Laboratory for Control and Computer Systems Department of Electrical Engineering Bandung Institute of Technology Indonesia

IP network has been evolving significantly in last decade. Many computers and devices have been attached to the IP network and many applications were taken place over it. One of interesting applications is building embedded control system which has connectivity to Internet. This paper explains an implementation of embedded web server with security support which becomes an example of control application over IP network. A security algorithm, TEA (tiny encryption algorithm), has been implemented in a microprocessor system together with TCP/IP stack. The microprocessor system is based on 8051 family microcontroller which serves as web server. The encryption algorithm is processed both on server and client. Therefore in clients need a plug in, which run encryption mechanism, so that they can access the embedded Web server safely.

关键词： Internet control systems IP networks Application software Web server Cryptography Microprocessors computer networks TCPIP Microcontrollers

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Digital PI fuzzy control strategies applied to an electric microgenerator system

Digital PI fuzzy control strategies applied to an electric m...

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IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： B.M. Campos C.T. da Costa W. Barra K.C.F. da Silva J.A.L. Barreiros Laboratory of Control and Systems (LACOS) Technological Center Electrical and Computer Engineering Department Federal University of Para Belem Para Brazil

This paper investigates digital modeling and control strategies applied to the voltage regulation of a microgenerator system, placed in the Electric Energy Generation laboratory of Federal University of Para. Identification parametric techniques are used in order to obtain a representative model for the controller design. With a suitable model, controllers of proportional integral type are designed, based on the root locus and fuzzy systems strategies, in order to improve the voltage regulation of the microgenerator system.

关键词： Fuzzy control Voltage control Digital control Proportional control Fuzzy logic Regulators control systems DC motors Velocity control Laboratories

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Experimental evaluation of a new repetitive control algorithm on a non-minimum phase spring-mass-damper system

Experimental evaluation of a new repetitive control algorith...

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2004 IFAC Workshop on Adaptation and Learning in control and Signal Processing, ALCOSP 2004 and IFAC Workshop on Periodic control systems, PSYCO 2004

作者： Freeman, C.T. Hätönen, J.J. Lewin, P.L. Owens, D.H. Rogers, E. School of Electronics and Computer Science University of Southampton University Road SouthamptonSO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Systems Engineering Laboratory University of Oulu University of Oulu P.O. BOX 4300 FIN-90014 Finland

Recently, a novel optimality based Repetitive control algorithm was proposed in (Hätönen et al., 2003). According to the convergence analysis carried out in that paper, the algorithm will result in asymptotic convergence for an arbitrary discrete-time LTI plant and a T -periodic reference. However, the performance of the algorithm was tested only using simulation studies. In order to rigorously test how the algorithm performs with real systems, in this paper the algorithm is implemented on a non-minimum phase spring-mass-damper system. The results are very satisfactory, because the algorithm results in near perfect tracking with this rather demanding plant type. Copyright © 2004 IFAC.

关键词： Non-Minimum Phase systems Optimal control Polynomial systems Theory Repetitive control

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Practical implementation of a model inverse iterative learning controller

Practical implementation of a model inverse iterative learni...

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2004 IFAC Workshop on Adaptation and Learning in control and Signal Processing, ALCOSP 2004 and IFAC Workshop on Periodic control systems, PSYCO 2004

作者： Ratcliffe, J.D. Harte, T.J. Hätönen, J.J. Lewin, P.L. Rogers, E. Owens, D.H. School of Electronics and Computer Science University of Southampton University Road SouthamptonSO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Systems Engineering Laboratory University of Oulu University of Oulu P.O. BOX 4300 FIN-90014 Finland

In this paper, a new model inverse optimal iterative learning control algorithm is practically implemented on an industrial gantry robot. The algorithm has only one tuning parameter which can be adjusted to provide a balance between convergence speed and robustness. Results show that the algorithm is capable of learning the required trajectory in very few iterations. However at this convergence rate the lack of robustness is a major issue. Appropriate use of the tuning parameter is shown to greatly increase the algorithm robustness as demonstrated by tests which successfully reach 600 iterations. Copyright c 2004 IFAC. Copyright © 2004 IFAC

关键词： Iterative methods

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Robustness of dual-rate inferential MPC systems

Robustness of dual-rate inferential MPC systems

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American control Conference (ACC)

作者： J.A. Rossiter J. Sheng T. Chen S.L. Shah Department of Automatic Control & Systems Engineering Sheffield University Sheffield UK Coordinated Science Laboratory University of Illinois Urbana USA Department of Electrical & Computer Engineering University of Alberta Edmonton AB Canada Department of Chemical & Materials Engineering University of Alberta Edmonton AB Canada

This paper investigates the robustness of dual-rate MPC systems with a proposed inferential control strategy. It shows that for some scenarios where a high-frequency model plant mismatch is presented, such dual-rate i... 详细信息

关键词： Robustness Robust stability Predictive models Robust control control systems Predictive control Strontium control system analysis Integrated circuit modeling Time varying systems

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