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INTERVAL ASYMPTOTIC ESTIMATOR FOR CHLORINE MONITORING IN DRINKING WATER DISTRIBUTION SYSTEMS

IFAC Proceedings Volumes 2006年第14期39卷 35-40页

作者： R. Łangowski M.A. Brdys Department of Automatic Control Gdansk University of Technology ul G. Narutowicza 11/12 80-952 Gdansk Poland School of Engineering Department of Electrical Electronic and Computer Engineering The University of Birmingham Birmingham B15 2TT UK

Asymptotic and interval observer for quality monitoring in drinking water distribution systems is derived in this paper. It produces robust interval bounds on the estimated state variables of the water quality. Solving two differential equations generates the bounds; hence the numerical efficiency is sufficient for on-line monitoring of the water quality. The observer is applied to example water network and tight bounds-estimates are obtained.

关键词： estimators bounding method dynamic modelling water quality

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MODELLING OF WASTEWATER TREATMENT PLANT FOR MONITORING AND control PURPOSES BY STATE - SPACE WAVELET NETWORKS

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IFAC Proceedings Volumes 2006年第14期39卷 250-255页

作者： A. Borowa M.A. Brdyś K. Mazur Department of Automatic Control Gdansk University of Technology ul. G. Narutowicza 11/12 80 952 Gdansk Poland School of Engineering Department of Electronic Electrical and Computer Engineering The University of Birmingham Birmingham B15 2TT UK

Most of industrial processes are nonlinear, not stationary, and dynamical with at least few different time scales in their internal dynamics and hardly measured states. A biological wastewater treatment plant falls into this category. The paper considers modelling such processes for monitorning and control purposes by using State - Space Wavelet Neural Networks (SSWN). The modelling method is illustrated based on bioreactors of the wastewater treatment plant. The learning algorithms and basis function (multidimensional wavelets) are also proposed. The simulation results based on real data record are presented.

关键词： Neural network models Model approximation Learning algorithms Waste treatment

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Delay dependent fault estimation for uncertain time delay nonlinear systems: an LMI approach

Delay dependent fault estimation for uncertain time delay no...

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American control Conference (ACC)

作者： Sing Kiong Nguang Peng Shi S. Ding The Department of Electrical and Computer Engineering University of Auckland New Zealand School of Technology University of Glamorgan Pontypridd UK Institute for Automatic Control and Complex Systems (AKS) Faculty of Engineering University of Duisburg-Essen Duisburg Germany

This paper deals with the problem of robust fault estimation for uncertain time delay Takagi-Sugeno (TS) fuzzy models. The aim of this study is to design a delay dependent fault estimator ensuring a prescribed H infin performance level for the fault estimation error, irrespective of the uncertainties and the time delays. Sufficient conditions for the existence of a robust fault estimator are given in terms of linear matrix inequalities. Membership functions'(MFs) characteristics are incorporated into the fault estimator design to reduce the conservativeness of neglecting these characteristics

关键词： Delay effects Delay estimation Nonlinear systems Fuzzy systems Fault detection Robustness Uncertainty Estimation error Sufficient conditions Linear matrix inequalities

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Output feedback/feedforward control of discrete linear repetitive processes for performance and disturbance rejection

Output feedback/feedforward control of discrete linear repet...

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American control Conference (ACC)

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

Repetitive processes propagate information in two independent directions and are of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed ID here) or 2D systems theory. Here we give new results on the design of physically based feedforward/feedback control laws to achieve desired performance and disturbance decoupling in the sense defined in the body of the paper. The new results are for the case when only output (as opposed to state) information is used to activate the control law

关键词： Output feedback Linear feedback control systems control systems Optimal control Process control Linear systems Stability Feedback control Algorithm design and analysis Iterative algorithms

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Texture Discrimination by Local Morphological Multifractal Signatures

Texture Discrimination by Local Morphological Multifractal S...

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IEEE Region 10 International Conference TENCON

作者： Yong Xia Rongchun Zhao Yanning Zhang Dagan Feng Jian Sun School of Computer Northwestern Polytechnical University China School of Information Technologies University of Sydney Australia Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China School of Automatic Control Northwestern Polytechnical University China

Both the fractal dimension (FD) and the multifractal dimensions (MFD) have been widely used to describe natural textures in image processing community. However, due to the essential difference between the fractal reality of digital images and the mathematical fractal model, most FD/MFD estimation algorithms intrinsically produce less accurate results. In this paper, the idea of fractal signature is adopted and extended to the morphological multifractal estimation. As a result, a novel texture descriptor, namely the local morphological multifractal signatures (LMMS), is proposed to characterize the local scaling property of textured images. The LMMS depict the behavior of the morphological MFD over a wide range of spatial scales. The proposed LMMS feature, together with the fractal signature and the morphological MFD, has been applied to the discrimination of Brodatz textures. The comparison results demonstrate that our LMMS feature can differentiate natural textures more effectively

关键词： Fractals Digital images Mathematical model Surface morphology Sun automatic control Image processing Frequency domain analysis Geometry Shape

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On the design and control of wireless networked embedded systems

On the design and control of wireless networked embedded sys...

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IEEE International Conference on computer-Aided Design

作者： Karl-Erik Arzen Antonio Bicchi Stephen Hailes Karl H. Johansson John Lygeros Department of Automatic Control Lund University Sweden Centro E. Piaggio University of Pisa Italy Department of Computer Science University College London UK School of Electrical Engineering Royal Institute of Technology Stockholm Sweden Department of Electrical and Computer Engineering University of Patras Greece

Wireless networked embedded systems are becoming increasingly important in a wide area of technical fields. In this tutorial paper we present recent results on the design of these systems and their use in control applications, that have been developed within the project Reconfigurable Ubiquitous Networked Embedded Systems (RUNES). RUNES is a European Integrated Project with the aim to control complexity in networked embedded systems by developing robust and scalable middleware systems. New components for control under varying network conditions are discussed for the RUNES architecture. The paper highlights how the complexity of the closed-loop system is increased, due to additional disturbances introduced by the communication system: additional delays, jitter, data rate limitations, packet losses, etc. Experimental work on integration test beds that demonstrates these results is presented, together with motivating links to the RUNES disaster relief tunnel scenario

关键词： control systems Embedded system Communication system control Fires Networked control systems Testing Middleware Added delay Jitter Mobile robots

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DELAYED FEEDBACK control: A SURVEY AND SOME NEW RESULTS

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IFAC Proceedings Volumes 2006年第8期39卷 36-41页

作者： Yu-Ping Tian Jiandong Zhu Guanrong Chen Department of Automatic Control Southeast University Nanjing 210096 P.R.China School of Mathematics and Computer Science Nanjing Normal University Nanjing P. R. China Department of Electronic Engineering City University of Hong Kong P. R. China

This paper presents the basic idea and the mathematical formulation of the delayed feedback control (DFC) methodology. Stability analysis including the well-known odd number limitation of the DFC is reviewed. Some new advances in characterization of the limitation of the DFC are presented. Finally, some open problems in this research field are discussed.

关键词： Delayed feedback control Chaos control Stability Chaotic system

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Noise Reduction Design of Perfect Reconstruction Oversampled Filter Banks

Noise Reduction Design of Perfect Reconstruction Oversampled...

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

作者： Li Chai Jingxin Zhang Cishen Zhang E. Mosca Department of Automatic Control Hangzhou Dianzi University Hangzhou China Department of Electrical and Computer Systems Engineering Monash University Hangzhou VIC Australia Department of Electrical and Computer Systems Engineering Monash University VIC Australia School of Electrical and Electronic Engineering Nanyang Technological University Singapore Dipartimento di Sistemi e Informatica Universityá di Firenze Italy

This paper studies the noise reduction design problem for oversampled filter banks (FBs) with perfect reconstruction (PR) constraint. Both the optimal design and worst case design are considered, where the former method caters for the noise with known power spectral density (PSD) and the latter one for the noise with unknown PSD. Explicit formulae involving only algebraic Riccati equation and matrix manipulations are provided for the general (IIR or FIR) oversampled PR FBs

关键词： Noise reduction Channel bank filters Colored noise Finite impulse response filter Filter bank Riccati equations Quantization Filtering Systems engineering and theory Design engineering

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Multi-objective Approximation of IIR by FIR Digital Filters

Multi-objective Approximation of IIR by FIR Digital Filters

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World Congress on Intelligent control and Automation (WCICA)

作者： Jingxin Zhang Li Chai Cishen Zhang E. Mosca Department of Electrical and Computer Systems Engineering Monash University VIC Australia Department of Automatic Control Hangzhou Dianzi University Hangzhou China Department of Electrical and Computer Systems Engineering Monash University Hangzhou VIC Australia School of Electrical and Electronic Engineering Nanyang Technological University Singapore Dipartimento di Sistemi e Informatica Universityá di Firenze Italy

This paper studies the mixed-norm approximation of IIR digital filters by FIR digital filters. Effective methods using LMIs are presented to solve the approximation problem. The effectiveness is demonstrated by examples

关键词： Finite impulse response filter Digital filters Chebyshev approximation Least squares approximation Transfer functions Linear matrix inequalities Wideband Frequency Narrowband Least squares methods

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Construction of Tight Filter Bank Frames

Construction of Tight Filter Bank Frames

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

In this paper, we present an explicit and numerically efficient formulae to construct a tight (paraunitary) FB frame from a given un-tight (non-paraunitary) FB frame. The derivation uses the well developed techniques from modern control theory, which results in the unified formulae for generic IIR and FIR FBs. These formulae involve only algebraic matrix manipulations and can be computed efficiently and reliably without the approximation required in the existing literature

关键词： Filter bank State-space methods control theory Finite impulse response filter Matrices Signal design Systems engineering and theory Information analysis Signal analysis Noise reduction

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