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Robust Fault Detection Using Index of Kullback Discrimination Information

IFAC Proceedings Volumes 1996年第1期29卷 6524-6529页

作者： K. Kumamaru J. Hu K. Inoue T. Söderström Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820 Fukuoka Japan. Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O.Box 27 Uppsala Sweden

This paper presents a robust fault detection system (FDS) for dynamic systems with unmodeled dynamics. In the FDS, umnodeled dynamics is first qualified as soft bound, which as well as model parameters are estimated using a robust identification algorithm. Then as a fault detection index, Kullback discrimination information (KDI) is derived into a feasible form and an index of umnodeled dynamics is also introduced. A decision making scheme is thus developed so that fault detection is carried out based on the KDI, the index of umnodeled dynamics and other prior information about the system.

关键词： Fault detection parameter identification stochastic modeling robust estimation uncertainty

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Application of reversible discrete-time cellular neural networks to image copyright labelling

Application of reversible discrete-time cellular neural netw...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Tao Yang K.R. Crounse L.O. Chua Electronics Research Laboratory Department of Electrical Engineering and Computer Sciences University of California Berkeley Berkeley CA USA Department of Automatic Control Engineering Shanghai University of Technology Shanghai China

In this paper, we proposed a discrete-time cellular neural network (DTCNN) structure for the labelling of digital images. First, we present the concept and the structure of reversible DTCNN, which can be used to generate 2D binary random image sequences. Then both the original image and the copyright label, which is often another binary image, are used to generate a binary random key image. The key image is then used to scramble the original image. Due to the reversibility of a reversible DTCNN, the same reversible DTCNN is used to recover the copyright label from a labelled image. Due to the high speed of a DTCNN chip, our method can be used to label image sequences, e.g., video sequences, in real time. computer simulation results are presented.

关键词： Cellular neural networks Labeling Image sequences computer networks Multimedia databases Space technology Cellular networks Application software Laboratories Digital images

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Neural modules: networks with constrained architectures for nonlinear function identification

Neural modules: networks with constrained architectures for ...

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International Workshop on Neural Networks for Identification, control, Robotics, and Signal/Image Processing

作者： B. Morcego J.M. Fuertes G. Cembrano Automatic Control and Computer Engineering Department Universitat Politecnica de Catalunya Barcelona Spain Institute of Cybemetics Universitat Politecnica de Catalunya Barcelona Spain

The aim of this work is the design of a class of neural networks for nonlinear function identification: the so-called neural modules. A neural module is a neural network with an internal structure specially designed to be able to learn and mimic the behaviour of a certain class of dynamic systems. Neural networks are abstract models well suited for approximating nonlinear functions. The training cost and the structural complexity of neural networks can be drastically reduced if a-priori knowledge of the function to be learned is internally incorporated in the form of structural constraints. The resulting neural network has less parameters than a conventional one, much faster learning convergence and it can provide meaningful information about the learned nonlinear function. This paper describes the design of a useful set of neural modules for system identification and gives general guidelines for the design of neural modules. The resulting networks are evaluated and their use on general systems identification is pointed out.

关键词： Artificial neural networks Neural networks System identification Guidelines control systems Nonlinear systems Network topology computer architecture automatic control control engineering computing

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Fast and accurate method to measure interharmonics in power systems

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EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1996年第3期6卷 169-174页

作者： Dai, X Gretsch, R [?]Associate Prof. Dr.-Ing. Xianzhong Dai (1954) received the Dr. degree (Elec. Eng.) from Tsinghua University of China in 1986. In 1988 he joined Southeast University as Associate Professor. In 1991 he became Humboldt Research Fellow and worked for two years at University of Erlangen-Nurnberg/Germany. His research work is focused to real-time control measurement and computer application on reactive power and harmonics compensation in power systems. (Automatic Control Engineering Department Southeast University Nanjing Jiangsu P. R. China)

In order to improve the resolution of spectrum analysis, the traditional method is to take more sampling periods, e. g. 50 sampling periods corresponding to the spectrum interval of I Hz. This method is not suitable to the interharmonic measurement, because most interharmonics vary rather quickly with the time and so the analysis results based on long time sampling may be useless. In this paper the zero-padding technique with short sampling time is used to resolve interharmonics, and the zoom FFT is used to decrease the computation time in order to meet the needs of real-time measurement. The simulating computation shows that the resolution for two adjacent frequency components is usually sufficient to measure harmonics and interharmonics in power systems with acceptable short sampling and computation time. This method is also suited to analyse harmonics and interharmonics when there exists an undesirable asynchronous deviation between the sampling period and the signal period.

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Adaptive synchronization of Chua's oscillators

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INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS 1996年第1期6卷 189-201页

作者： Chua, LO Yang, T Zhong, GQ Wu, CW Electronics Research Laboratory Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley CA 94720 USA Visiting scholar on leave from the Department of Automatic Control Engineering Shanghai University of Technology 149 Yan Chang Road Shanghai 200072 P. R. China. Visiting scholar on leave from Guangzhou Institute of Electronic Technology Academia Sinica Guangzhou 510070 P. R. China.

In this letter, we study the use of adaptive controllers to maintain the synchronization of two Chua's oscillators when the channel and circuit parameters are time-varying. We present both computer simulation resu...

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ROBUST STABILITY OF TIME-VARIANT DISCRETE-TIME-SYSTEMS WITH BOUNDED PARAMETER PERTURBATIONS

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-FUNDAMENTAL THEORY AND APPLICATIONS 1995年第1期42卷 40-45页

作者： PREMARATNE, K MANSOUR, M Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA University of Miami Coral Gables USA Automatic Control Laboratory Swiss Federal Institute of Technology Zurich Switzerland

In this paper, global asymptotic stability of linear, time-variant, finite dimensional, zero input difference equations is investigated. We propose a technique that may be utilized to obtain regions of asymptotic stability in the coefficient space that incorporate information regarding the maximum rate of change of system parameters. Use of different matrix norms provide different ''shapes'' for the maximum allowable coefficient perturbations.

关键词： Robust stability TV Asymptotic stability Difference equations Robustness Adaptive signal processing Eigenvalues and eigenfunctions Chromium automatic control Laboratories

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Automated Hard Real-Time Scheduling

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IFAC Proceedings Volumes 1995年第5期28卷 241-246页

作者： Adrian R. Browne Julian M. Bass Peter R. Croll Peter J. Fleming Department of Automatic Control and Systems Engineering University of Sheffield UK Department of Computer Science University of Sheffield UK

The task of guaranteeing that processes meet their deadlines is one of the most complex in the design of hard real-time control systems. This paper describes how process scheduling has been integrated into a framework of tools for the development of such systems. Functional specifications in the form of control system block diagrams are translated by the Framework into real-time source code which may be executed in a parallel processing environment. The automated off-line scheduling tool takes process specifications from the system under development and attempts to map these processes to the processors in such a way that all the system deadlines are met by using a detailed model of the run-time environment.

关键词： CASE real-time systems parallel processing scheduling algorithms software tools genetic algorithms

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Modelling, Adaptive, Neural and Fuzzy control of Coal Power Plants 1

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IFAC Proceedings Volumes 1995年第26期28卷 347-352页

作者： Petr Pivoňka Department of Automatic Control and Instrumentation Faculty of Electrical Engineering and Computer Science 61266 Brno Božetěchova 2 Czech Republic

At the preparatory stage for connecting the Czech power systems to the West European UCPTE system, corrections for frequency must be included in the output power control, i.e. the primary control must be introduced. The result of the detailed analysis was a model of primary output power control of the block and a new power system control of Czech coal power plants. In the new power system control, an adaptive or robust controller will be used for operation stabilisation

关键词： Power system control adaptive control neural control fuzzy control fuzzy PID controllers self-tuning control neural nets

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Dependability modelling in a prototype development framework

Dependability modelling in a prototype development framework

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International Symposium on Fault-Tolerant Computing (FTCS)

作者： J.M. Bass S. Metge A. Browne P.R. Croll P.J. Fleming Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK LAAS CNRS Toulouse France Department of Computer Science University of Sheffield UK

The Development Framework provides a highly automatic translation from a specification to an implementation. The specification is in a popular, graphical control engineering notation typically representing a system with stringent reliability requirements and hard real time constraints. An interface has been constructed between the Development Framework and the commercially available dependability modelling tool, SURF-2. This tool is designed to support an evaluation based design approach. Multiple design solutions can be compared to assess the implications of design decisions on the dependability of the system under development. The software demonstration will show how the interface between the Development Framework and SURF-2 is used to model the inclusion of selected fault tolerant mechanisms in the system under development.< >

关键词： Prototypes automatic control Application software control systems control engineering Time factors Design engineering Real time systems Software engineering Computational modeling

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Improved LMS estimation via structural detection

Improved LMS estimation via structural detection

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IEEE International Symposium on Information Theory

作者： J. Homer I. Mareels R. Bitmead B. Wahlberg F. Gustafsson Electrical & Computer Engineering Department University of Queensland Brisbane QLD Australia Systems Engineering Department RSISE-Australian National University Canberra ACT Australia S3-Automatic Control Royal Institute of Technology Stockholm Sweden Automatic Control Linköping University Linkoping Sweden

In various adaptive estimation applications, the unknown channel is characterized by an impulse response which consists of extended regions of negligible response or 'inactivity'. We consider the LMS estimation of a channel that may be well approximated by an FIR (filter) model with only a few nonzero tap coefficients within a given delay horizon or tap length n. When the number of nonzero tap coefficients m is small compared to the delay horizon n, the performance of the LMS estimator is greatly enhanced when this specific structure is exploited. We propose a consistent algorithm that performs identification of nonzero taps only.

关键词： Least squares approximation Australia Cost function Finite impulse response filter automatic control Delay estimation Adaptive estimation Circuits Land mobile radio Sampling methods

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