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5th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service, TELSIKS 2001

作者： Dimirovski, G.M. Jing, Yuanwei Zhang, Siying Dept. of Computer Engineering Faculty of Engineeing DOGUS University Zeamet Sk. 21 TR-81010 Kadikoy-Istanbul Turkey Institute of Automation and Systems Engg. Faculty of Electical Engineering Methodius University MK-1000 Skopje Macedonia Institute of Control Theory School of Information Science and Engineering Northeastern University Shenyang Liaoning 110006 China

ISBN: (纸本)078037228X

This paper addresses networking and traffic control problems in network systems along with the potential for introducing soft-computing applications at supervisory control level. The incentive Stackelberg strategy control concept was introduced to the networking model that comprises subsidiary systems of users and of network. A linear strategy is proposed for the elastic traffic problem, and results are demonstrated and illustrated via Kelly's (1997) example. The presented method is extended to the non-elastic traffic problem and results are also illustrated via a slightly modified Kelly example. Ways of employing combined analytical and soft-computing approaches and techniques in a hybrid framework have been investigated. A fuzzy-Petri-net supervisor is proposed to implement the strategic decision and control layer. Insofar obtained results are rather encouraging, and this research continues further towards possible implementation as well as some open theoretical issues. © 2001 IEEE.

关键词： Game theory

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Skid to turn control of the APKWS missile using trajectory linearization technique

Skid to turn control of the APKWS missile using trajectory l...

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American control Conference (ACC)

作者： M.C. Mickle J.J. Zhu Guidance Navigationa and Control Department Ratheon Missile Systems USA School of Electrical Engineering and Computer Science Ohio University USA

This paper presents the design and simulation results of an autopilot for the US Army's APKWS missile. The concept is to add on a guidance section to the existing Hydra 70 unguided rocket airframe. The guidance section is to be mounted onto existing hardware using a deroll bearing which permits the motor to roll freely while the guidance section is roll stabilized. The Hydra 70 has unusual dynamic and aerodynamic characteristics, which include a very large intentional induced roll moment which is heavily influenced by down wash effects on the rear spin inducing fins from large aerodynamic angles and the displacement of the control canards. Moreover, angle of attack tracking with control canards makes the problem nonminimum phase. The autopilot consists of a nonlinear inverse subsection which places the missile on the nominal commanded trajectory, and a linear time varying trajectory regulating controller. The regulating controller is formulated using a new parallel differential eigenvalue stability concept. An advantage of the proposed design method is that the controller gains are computed symbolically such that a full flight envelope autopilot can be designed without resorting to pointwise gain scheduling. Simulation results are shown to demonstrate the effectiveness of the trajectory linearization control technique.

关键词： Missiles Aerodynamics Rockets Hardware Displacement control Eigenvalues and eigenfunctions Stability Design methodology Processor scheduling Computational modeling

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Assessment of the effects of wind farms connected in a power system

Assessment of the effects of wind farms connected in a power...

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Power Tech Conference

作者： M.A.B. Amora U.H. Bezerra NESC-Nucleus of Engineering in Supervision and Control of Systems Department of Electrical and Computer Engineering Federal University of Para Belem Para Brazil Department of Electrical and Computer Engineering Federal University of Para Belem Para Brazil

In this work, the authors present the results of transient stability studies, which are accomplished when assessing the effects of the connection of wind farms in a power system. For the execution of those studies, a software environment for stability simulation was developed in MATLAB/sup TM/ with a friendly user interface, that allows the execution of different cases studies, e.g. sudden disconnection of the wind farm or part of the wind farm, operation under turbulent wind, operation under wind gust, short circuits in the network, loss of conventional generation and reduction of loads. Results of simulation studies are shown to illustrate the use of the software developed and to evaluate the effects on the stability of a test power system, of the integration of a wind farm into the electric grid.

关键词： Wind farms Power systems Power system stability Power system simulation Power system transients Circuit stability Circuit simulation MATLAB User interfaces Wind energy generation

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Unconstrained receding horizon control with no terminal cost

Unconstrained receding horizon control with no terminal cost

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American control Conference (ACC)

作者： A. Jadbabaie J. Primbs J. Hauser Control and Dynamical Systems California Institute of Technology Pasadena CA USA Electrical and Computer Engineering and AeroSpace Engineering University of Colorado Boulder CO USA

In this paper, we discuss a stabilizing receding horizon scheme for unconstrained nonlinear systems. Using Dini's theorem on the uniform convergence of functions, we show that there always exist a finite horizon length for which the corresponding receding horizon scheme is stabilizing without using terminal costs and/or constraints.

关键词： Costs Stability Open loop systems Nonlinear systems control systems Lyapunov method Automatic control Linear systems Nonlinear control systems Postal services

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Direction finding for a wavefront with imperfect spatial coherence

Direction finding for a wavefront with imperfect spatial coh...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： O. Besson P. Stoica A.L.B. Gershman Department of Avionics and Systems ENSICA Toulouse France Department of Systems and Control University of Uppsala Uppsala Sweden Department of Electrical and Computer Engineering McMaster University Hamilton Canada

We consider the direction-of-arrival (DOA) problem for a wavefront whose amplitude and phase vary randomly along the array aperture. This phenomenon can for instance originate from propagation through an inhomogeneous medium. A simple and accurate DOA estimator is derived in the case of an uniform linear array of sensors. The estimator is based upon a reduced statistic obtained from the sub-diagonals of the covariance matrix of the array output. It only entails computing the Fourier transform of an (m-1)-length sequence where m is the number of array sensors. A theoretical expression for the asymptotic variance of the estimator is derived. Numerical simulations validate the theoretical results and show that the estimator has an accuracy very close to the Cramer-Rao bound.

关键词： Spatial coherence Sensor arrays Direction of arrival estimation Phased arrays Apertures Sensor phenomena and characterization Statistics Covariance matrix Fourier transforms Numerical simulation

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Robust /spl Hscr//sub /spl infin// filtering for uncertain discrete-time state-delayed systems

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IEEE Transactions on Signal Processing 2001年第8期49卷 1696-1703页

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

This paper addresses the problem of robust /spl Hscr//sub /spl infin// filtering for linear discrete-time systems subject to parameter uncertainties in the system state-space model and with multiple time delays in the state variables. The uncertain parameters are supposed to belong to a given convex bounded polyhedral domain. A methodology is developed to design a stable linear filter that assures asymptotic stability and a prescribed /spl Hscr//sub /spl infin// performance for the filtering error, irrespective of the uncertainty and the time delays. The proposed design is given in terms of linear matrix inequalities, which has the advantage in that it can be implemented numerically very efficiently.

关键词： Filtering Nonlinear filters Delay effects Uncertainty Noise robustness Uncertain systems Linear matrix inequalities Signal design Riccati equations Context modeling

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SAR image construction from gapped phase-history data

SAR image construction from gapped phase-history data

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IEEE International Conference on Image Processing

作者： E.G. Larsson P. Stoica Jian Li Department of Systems and Control University of Uppsala Uppsala Sweden Department of Systems and Control the SwedishFoundation for Stmtegic Research SSF Uppsala University Uppsala Sweden Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

We propose a method for estimating the amplitude spectrum of a 2D-signal from frequency domain (or phase history) data that contain gaps. This is a key problem in synthetic aperture radar (SAR) imaging with angular diversity. Our method is an extension of the well-known amplitude and phase estimation (APES) algorithm to the incomplete data case, and is called gapped-data APES (GAPES). It has recently been shown that APES minimizes a certain least-squares (LS) criterion, and our extension of APES is based on minimizing this criterion with respect to the missing data as well. We provide an example of the algorithm applied to SAR imaging from phase history data with angular diversity; and we also show the advantages of 2D data processing over 1D (row or column-wise) data processing that are enabled by our new algorithm.

关键词： Amplitude estimation Frequency estimation Phase estimation Noise level History Radar polarimetry Data processing Finite impulse response filter control systems Frequency domain analysis

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Output steering using iterative learning control

Output steering using iterative learning control

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European control Conference (ECC)

作者： T.Y. Townley D.H. Owens School of Engineering and Computer Science University of Exeter Exeter U.K Automatic Control and Systems Engineering University of Sheffield Sheffield U.K

A causal iterative learning control algorithm based on optimal feedback and feedforward control is derived to provide perfect tracking of selected output values at specified times. Exponential convergence of the algorithm is proved and a realization based on Riccati feedback is described. The properties of the algorithm are illustrated by example.

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A family-oriented software development process for engine controllers

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Lecture Notes in computer Science

作者： Allenby, Karen Burton, Simon Buttle, Darren McDermid, John Murdoch, John Stephenson, Alan Bardill, Mike Hutchesson, Stuart Rolls-Royce University Technology Centre in Systems and Software Engineering Department of Computer Science University of York YorkYO10 5DD United Kingdom Rolls-Royce Plc Control Systems SinC-3 P.O. Box 31 Moor Lane DerbyDE24 8BJ United Kingdom

ISBN: (纸本)3540425713

This paper presents a software engineering process that includes family-based aspects for aero-engine control software. The process uses a "family capability" derived from family analysis of the embedding system. This analysis allows reuse capability to be designed into the process by exploiting prior knowledge of the differences between members of an engine family. The process described follows the traditional software lifecycle. However, the nature of the stages is modified to incorporate the use of the family capability, essentially to allow systematic application of both compositional and generational reuse throughout the development process. The process described was evaluated on a trial project to develop, and subsequently modify, a thrust reverser system for a small aero-engine. Initial results show that this process can reduce effort for both initial and subsequent developments through the use of the family capability. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Engines

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A 2D systems approach to iterative learning control based on nonlinear adaptive control techniques

A 2D systems approach to iterative learning control based on...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： M. French E. Rogers H. Wibowo D.H. Owens Department of Electronics and Computer Science University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

ISBN: (纸本)0780366859

We consider the iterative learning control problem from a 2D systems/adaptive control viewpoint. In particular, it is shown how some fundamental results from nonlinear adaptive control can be successfully applied in the iterative learning control domain under very weak assumptions. Some areas for further research are also briefly discussed.

关键词： Iterative methods Nonlinear control systems control systems Adaptive control Automatic control Iterative algorithms computer science systems engineering and theory Robots Manipulators

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