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Radial control design for a class of nonlinear systems

control and Intelligent Systems 2009年第3期37卷 144-151页

作者： Sangelaji, Z. Banks, S.P. Department of Computing and the Digital Environment Coventry University Coventry CV1 5FB United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S10 2TN United Kingdom

In this paper, the stabilization of a class of nonlinear systems using the associated angular method is studied. In this approach, the system is converted into two subsystems, the so-called radial and spherical subsystems in which the radial subsystem is first order and the dimension of spherical subsystem is the same as the original system. In many cases, a stabilizing control law can be directly obtained using the one-dimensional radial system dynamics. This control stabilizes the original system without any extra condition.

关键词： Stabilization

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Robust H∞ filtering of nonlinear networked systems with multiple stochastic communication delays

Robust H∞ filtering of nonlinear networked systems with mul...

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Asian control Conference

作者： Hongli Dong Zidong Wang Huijun Gao College of Electrical and Information Engineering Daqing Petroleum Institute Daqing China Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin China Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK

This paper is concerned with the robust H infin filtering problem for a class of uncertain nonlinear networked systems with both multiple stochastic time-varying communication delays and multiple packet dropouts. The discrete-time system under consideration is also subject to parameter uncertainties, state-dependent stochastic disturbances and sector-bounded nonlinearities. Sufficient conditions are derived for a linear full-order filter such that the estimation error converges to zero exponentially in the mean square while the disturbance rejection attenuation is constrained to a give level by means of the H infin performance index. The explicit expression is then given for the desired filter parameters. A numerical example is exploited to show the usefulness of the results derived.

关键词： Robustness Stochastic systems Filtering Time varying systems Uncertain systems Sufficient conditions Nonlinear filters Estimation error Attenuation Performance analysis

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Decoupled fixed point transformation based adaptive control of the generalized 2 DOF Φ6-type Van der Pol oscillator

Decoupled fixed point transformation based adaptive control ...

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European control Conference (ECC)

作者： József K. Tar Imre J. Rudas János F. Bitó José A. Tenreiro Machado Krzysztof R. Kozłowski John von Neumann Faculty of Informatics Institute of Intelligent Engineering Systems John von Neumann Faculty of Informatics Budapest Tech Budapest Hungary John von Neumann Faculty of Informatics Institute of Intelligent Engineering Systems Budapest Hungary Institute of Engineering of Porto Portugal Control and Systems Engineering Computing Science and Management Poznan University of Technology Poznan Poland

In this paper a possible application of a novel adaptive control approach is reported that fits to the “traditional line of thinking” according to which in the most practical cases neither very precise, nor even complete system model is needed for obtaining precise control for dynamical systems. The validity of this statement is briefly pointed out in the most popular approaches as the main idea of the Robust Sliding Mode / Variable Structure controllers, in Lyapunov's 2nd Method, and in a recently published problem tackling based on the simple geometric interpretation of the Singular Value Decomposition. In the present approach differential equations are deduced from iterative Cauchy sequences to realize adaptive control of a coupled nonlinear system in “decoupled manner”, using single dimensional projections of the “acceleration space”. The paradigm on which the method is demonstrated is a 2 dimensional generalization of the originally single dimensional Φ 6 -type Van der Pol oscillator that is a popular paradigm of chaotic systems. Further possible generalizations of the novel method is outlined, too.

关键词： Decision support systems Bismuth Europe Adaptive control

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Using hierarchical coloured petri net to support substation restoration

Using hierarchical coloured petri net to support substation ...

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Power Tech Conference

作者： Luciano A. C. Lisboa Antonio M. N. Lima Leandro D. Silva Department of Control Systems Hydroelectric Company of San Francisco Recife Pernambuco Brazil Department of Electrical Engineering Federal University of Campina Grande Campina Grande Paraiba Brazil Computing Institute Federal University of Alagoas Maceio Alagoas Brazil

In this work, a solution to restore a substation is proposed, using hierarchical coloured Petri net, in a safe, reliable, fast and efficient way. This solution intends to solve the limitations of the solutions already presented in the academic world to solve this problem. A real substation case is considered. Using formal methods, a formulation and solution to this problem through structured, scalable and compact mathematical representations are possible. Algorithms and proprieties of the used formalism let analysis formally.

关键词： Substations Power system restoration Power generation economics control systems Transmitters Power system reliability Algorithm design and analysis Formal languages Petri nets Power system modeling

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Gene expression data classification based on non-negative matrix factorization

Gene expression data classification based on non-negative ma...

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International Joint Conference on Neural Networks (IJCNN)

作者： Chun-Hou Zheng Ping Zhang Lei Zhang Xin-Xin Liu Ju Han College of Information and Communication Technology Qufu Normal University Rizhao Shandong China Intelligent Computing Laboratory Institute of Intelligent Machines Chinese Academy and Sciences Hefei Anhui China Institute of automation Qufu Normal University Rizhao Shandong China Biometric Research Center Department of Computing Hong Kong Polytechnic University Hong Kong China Department of Control Engineering Academy of Armored Forces Engineering Beijing China

With the advent of DNA microarrays, it is now possible to use the microarrays data for tumor classification. Yet previous works have not use the nonnegative information of gene expression data. In this paper, we propose a new method for tumor classification using gene expression data. In this method, we first select genes using nonnegative matrix factorization (NMF) and sparse NMF (SNMF). Then we extract features of the selected gene data by virtue of NMF and SNMF. At last, support vector machines (SVM) was applied to classify the tumor samples based on the extracted features. To better fit for classification aim, a modified SNMF algorithm is also proposed. The experimental results on three microarray datasets show that the method is efficient and feasible.

关键词： Gene expression Principal component analysis Independent component analysis Neoplasms Data mining Feature extraction Data analysis Humans Bioinformatics DNA

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State observation for quasi-linear uncertain systems by nested high-order sliding mode observer

State observation for quasi-linear uncertain systems by nest...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Jorge Davila Leonid Fridman Alessandro Pisano Elio Usai General Direction of Academic Computing Services National Autonomous University of Mexico (UNAM) Mexico Department of Control Division of Electrical Engineering Engineering Faculty National Autonomous University of Mexico (UNAM) Mexico Dipartimento di Ingegneria Elettrica ed Elettronica (DIEE) Universita degli Studi di Cagliari Cagliari Italy

The problem of observation of some classes of quasilinear uncertain systems is studied in the framework of unknown input observer theory. High-order sliding-mode observers are designed for the considered classes of systems. Necessary conditions for the convergence of the proposed observers are given in terms of restrictions on the system matrices. A new observation scheme, based on the error injection by high-order sliding-mode control, is proposed. Simulations confirm the theoretical results.

关键词： Uncertain systems Sliding mode control Robustness Observers control systems Convergence Filtration Sampling methods Estimation error Observability

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Simple adaptive dynamical control of vehicles driven by omnidirectional wheels

Simple adaptive dynamical control of vehicles driven by omni...

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International Conference on Computational Cybernetics (ICCC)

作者： J.K. Tar I.J. Rudas I. Nagy K.R. Kozłowski J.A. Tenreiro Machado Telematics and Communications Informatics Knowledge Centre Hungary John von Neumann Faculty of Informatics Hungary Bánki Donát Faculty of Mechanical & Safety Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Control and Systems Engineering Computing Science & Management Poznań University of Technology Poznan Poland Department of Electrotechnical Engineering Institute Engineering of Porto Porto Portugal

Precise control of Automatic Guided Vehicles (AGVs) navigating between the aisles of manufacturing systems by the use of local markers is an important task. On the basis of the geometric model of the workspace and the vehicles and that of the sensor uncertainties precise trajectories were recently generated along which the vehicle safely can move. In order to achieve precise trajectory tracking the effects of the system's dynamical uncertainties (modeling errors and possible external perturbations) have to be compensated. In the present paper a simple, fixed point transformations based adaptive control is proposed for this purpose. The proposed method is tested via simulation for a vehicle of triangular shape, driven by three omnidirectional wheels. The method is also able to monitor and evade the conditions that may lead to turning over the vehicle.

关键词： Programmable control Adaptive control Vehicle driving Wheels Automatic control Vehicles Vehicle safety Uncertainty control systems Navigation

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NEURO-FUZZY BASED FAULT DIAGNOSIS OF A STEAM GENERATOR

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IFAC Proceedings Volumes 2009年第8期42卷 1180-1185页

作者： Roozbeh Razavi-Far Hadi Davilu Vasile Palade Caro Lucas Department of Nuclear Engineering Amirkabir University of Technology P.O. Box 15875-4413 Tehran Iran (Tel:+98-***) Computing Laboratory Oxford University Wolfson Building Parks Road Oxford OX1 3QD UK Center of Excellence on Control and Intelligent Processing Department of Electrical and Computer Engineering University of Tehran P.O. Box 14395-1515 Tehran Iran

This paper focuses on the development and application of a Neuro-Fuzzy (NF) networks-based scheme for Fault Detection and Isolation (FDI) in a U-tube Steam Generator (UTSG). First, a NF network is trained with data collected from a full scale UTSG simulator, and residuals are generated for fault detection. To identify the UTSG, a Locally Linear Neuro-Fuzzy (LLNF) model is used. This model is trained using the Locally Linear Model Tree (LOLIMOT) algorithm which is an incremental tree structure algorithm. Then, an evolutionary algorithm is used to train a Mamdani type NF network to classify the residuals. The residuals are analyzed by using this NF classifier for fault isolation purposes.

关键词： Fault Diagnosis Neuro-Fuzzy Networks Locally Linear Neuro Fuzzy Model Locally Linear Model Tree Steam Generator

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Ontology-based design pattern recognition

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12th International Conference on Knowledge-Based Intelligent Information and engineering Systems

作者： Kirasic, Damir Basch, Danko Information Support Center University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Faculty of Electrical Engineering and Computing

ISBN: (纸本)9783540855620

This paper presents ontlology-based architecture for pattern recognition in the context of static source code analysis. The proposed system has three subsystems: parser, OWL ontologies and analyser. The parser subsystem translates the input coded to AST that is constructed as an XML tree. The OWL ontologies define code patterns and general programming concepts. The analyser subsystem constructs instances of the input code as ontology individuals and asks the reasoner to classify them. The experience gained in the implementation of the proposed system and some practical issues are discussed. The recognition system successfully integrates the knowledge representation field and static code analysis. resulting in greater flexibility of the recognition system.

关键词： knowledge-based system ontology-based system static code analysis description logics OWL application formal pattern definition

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Using student generated audio to enhance learning

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engineering Education 2009年第2期4卷 52-61页

作者： A. Rossiter A. Nortcliffe A. Griffin A. Middleton Department of Automatic Control and Systems Engineering (ACSE) University of Sheffield Mappin Street Sheffield UK. Email: j.a.rossiter@shef.ac.uk Faculty of Art Computing Engineering and Science (ACES) Sheffield Hallam University Sheffield UK. Email: a.nortcliffe@shu.ac.uk LeTs University of Sheffield 5 Favell Road Sheffield UK Learning Teaching Institute Sheffield Hallam University Sheffield UK. Email: a.j.middleton@shu.ac.uk

This paper explores the issues surrounding the use of audio in learning and offers an alternative to podcasting. It considers the practicalities of enabling students to generate their own audio recordings and the potential to enhance and personalise learning in a self directed way that suits their individual learning styles. There is some discussion of hardware and its accessibility, cost and ease of use as well as protocols on what audio can/cannot be recorded or shared amongst students. The paper explores different types of scenario where recording can be used beneficially and uses real student case studies to demonstrate its efficacy, as perceived by the students. There is also particular emphasis on the benefits to specific student groups, including those with English as an additional language or students with learning difficulties. In summary the paper gives evidence of how student generated audio can be embedded into the curriculum and the benefits it can bring.

关键词： audio recording learning technology

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