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Progressive diversity management in evolutionary multiobjective optimisation

Progressive diversity management in evolutionary multiobject...

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Congress on Evolutionary Computation

作者： Salem F. Adra Peter J. Fleming Computer Science Department University of Sheffield Sheffield UK Automatic Control and Systems Engineering Department University of Sheffield Sheffield UK

Convergence towards, and diversity across the Pareto-optimal front are the two main requirements when optimising a multiobjective optimisation problem (MOP) with conflicting objectives. Most established multiobjective evolutionary algorithms (MOEAs) have mechanisms that address these requirements. However, in many-objective optimisation, where the number of objectives is greater than 2 or 3, it has been found that these two requirements can conflict with one another, introducing problems such as dominance resistance and speciation. In this study, a previously introduced diversity management mechanism is deployed within a Progressive Preference Articulation (PPA) technique to optimise an 8-objective real-world problem of aircraft control system design. This paper illustrates the effective application of the new diversity management mechanism used in conjunction with the PPA technique when optimising a multiobjective real-world engineering problem.

关键词： Optimization Mathematical model Convergence Equations Measurement Aircraft Delta modulation

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Asymptotic Synchronization of Nadolschi Chaotic Systems with Unknown Parameters via Adaptive control Method

Asymptotic Synchronization of Nadolschi Chaotic Systems with...

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The 22nd China control and Decision Conference(2010年中国控制与决策会议)

作者： Wei Deng Tieyan Zhang Yan Zhao Lihua Miao Department of Automatic Control Engineering Shenyang Institute of Engineering Shenyang 110136 Fundamental Teaching Department of Computer Mathematics and Physics Shenyang Medical College Shen

In this paper, the asymptotic synchronization of two identical Nadolschi chaotic systems with unknown parameters is investigated. First, by denoting the error signals as the difference of the state variables of the drive system and the state variables of the response system, the chaotic synchronization problem is transformed into the stabilization problem of the synchronization error system. Then, a novel adaptive controller is designed to realize the asymptotic synchronization of two identical Nadolschi chaotic systems with unknown parameters. By applying Lyapunov stability theory, the sufficient conditions for the asymptotic synchronization of two identical Nadolschi chaotic systems with unknown parameters are derived. Finally, the validity of the proposed chaotic synchronization scheme is demonstrated by the simulation results.

关键词： Chaotic Synchronization Adaptive control Asymptotic Synchronization Unknown Parameters

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Adaptive control for a Class of Chaotic Systems with Unknown Parameters

Adaptive Control for a Class of Chaotic Systems with Unknown...

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The 22nd China control and Decision Conference(2010年中国控制与决策会议)

作者： Yan Zhao Wei Deng Tieyan Zhang Lihua Miao Department of Automatic Control Engineering Shenyang Institute of Engineering Shenyang 110136 Fundamental Teaching Department of Computer Mathematics and Physics Shenyang Medical College Shen

In this paper, the stabilization problem of a class of continuous-time chaotic systems with unknown parameters is investigated. Based on the adaptive control idea, a novel adaptive state feedback controller is developed. By choosing appropriate controller structure and parametric updating law, the asymptotic stability of the closed-loop system is guaranteed. Simulation results are given to demonstrate the effectiveness and validity of the proposed adaptive control method.

关键词： Naodolschi Chaotic System Adaptive control Asymptotic Stability Unknown Parameters

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Model predictive controller for networked control systems

Model predictive controller for networked control systems

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12th IFAC Symposium on Large Scale Systems: Theory and Applications, LSS 2010

作者： Ewald, Grzegorz Brdys, Mietek A. Department of Automatic Control Gdansk University of Technology ul. Narutowicza 11/12 80-233 Gdańsk Poland School of Electronic Electrical and Computer Engineering College of Engineering and Physical Sciences University of Birmingham Edgbaston Birmingham B15 2TT United Kingdom

ISBN: (纸本)9783902661913

control of the networked control systems is a crucial challenge. In the environment of shared communication media, data may be randomly delayed or even lost. As the shared communication links are used in the critical infrastructure systems, the problem becomes even more important. As opposed to network compensation, solutions presented in the paper integrate network with the controlled plant. The proposed networked control system employs the model predictive control technology and is based on the buffer in the actuator. Stability of the presented solution used to control a linear discrete time system is analyzed. A simulation example is also provided.

关键词： Networked control systems

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On Synchronization of Two Identical Novel Hyperchaotic Systems with Fully Unknown Parameters

On Synchronization of Two Identical Novel Hyperchaotic Syste...

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The 8th World Congress on Intelligent control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Wei Deng Weihua Tian Xichang Han Lihua Miao Department of Automatic Control Engineering Shenyang Institute of Engineering Shenyang Liaoning Pro Fundamental Teaching Department of Computer Mathematics and Physics Shenyang Medical College Shenya

This paper concerns the synchronization problem two identical novel hyperchaotic systems with fully unknown parameters. A novel adaptive synchronization controller is realized for the response system to asymptotically synchronize two identical novel hyperchaotic systems. The asymptotic stability of the synchronization error system is guaranteed based on the Lyapunov stability theory and adaptive control idea. The effectiveness of the proposed adaptive synchronization method is verified by simulation studies.

关键词： Synchronization Chaotic communication Adaptation model Adaptive control Communication systems

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Complete synchronization between two identical discrete-time 2D hyperchaotic maps via fuzzy method

Complete synchronization between two identical discrete-time...

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International Conference on Educational and Information Technology (ICEIT)

作者： Lihua Miao Yusheng Li Xiaoyan Shen Fusheng Song Fundamental Teaching Department of Computer Mathematics and Physics Shenyang Medical College Shenyang China Department of Automatic Control Engineering Shenyang Institute of Engineering Shenyang China

ISBN: (纸本)9781424480333

In this paper, a novel fuzzy synchronization method is proposed to synchronize two identical discrete-time 2D hyperchaotic maps. Firstly, the T-S fuzzy model of the considered discrete-time 2D hyperchaotic map is constructed. The simple T-S fuzzy model with four IF-THEN rules can represent the hyperchaotic map accurately. Then, according to the PDC technique, a simple fuzzy state feedback controller is designed. By choosing appropriate controller gain matrices, the complete synchronization can be reached. Finally, simulation results are given to verify the effectiveness of the proposed fuzzy synchronization method.

关键词： 2D hyperchaotic map T-S fuzzy control complete synchronization parallel distributed compensation fuzzy method T-S fuzzy model discrete-time maps Simulation results shunt compensation Fuzzy Identical fuzzy modeling

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Accelerating Image Retrieval Using Binary Haar Wavelet Transform on the Color and Edge Directivity Descriptor

Accelerating Image Retrieval Using Binary Haar Wavelet Trans...

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International Multi-Conference on Computing in the Global Information Technology, ICCGI

作者： Savvas A. Chatzichristofis Yiannis S. Boutalis Avi Arampatzis Department of Electrical & Computer Engineering Democritus University of Thrace Xanthi Greece Department of Electrical Electronic and Communication Engineering Chair of Automatic Control University of Erlangen Nuremberg Germany

In this paper, a new accelerating technique for content-based image retrieval is proposed, suitable for the Color and Edge Directivity Descriptor (CEDD). To date, the experimental results presented in the literature have shown that the CEDD demonstrates high rates of successful retrieval in benchmark image databases. Although its storage requirements are minimal, only 54 bytes per image, the time required for the retrieval procedure may be practically too long when searching on large databases. The proposed technique utilizes the Binary Haar Wavelet Transform in order to extract from the CEDD a smaller and more efficient descriptor, with a size of less than 2 bytes per image, speeding up retrieval from large image databases. This descriptor describes the CEDD, but not necessarily the image from which is extracted. The effectiveness of the proposed method is demonstrated through experiments performed with a known benchmark database.

关键词： Histograms Wavelet transforms Image color analysis Image retrieval Transform coding

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Modeling the influence of non-minimum phase zeros on gradient based linear iterative learning control

Modeling the influence of non-minimum phase zeros on gradien...

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IEEE Conference on control Technology and Applications (CCTA)

作者： David H. Owens Bing Chu Zhonglun Cai Eric Rogers Chris T. Freeman Paul L. Lewin Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK School of Electronics and Computer Science University of Southampton Southampton UK

The subject of this paper is modeling of the influence of non-minimum phase plant dynamics on the performance possible from gradient based norm optimal iterative learning control algorithms. It is established that performance in the presence of right-half plane plant zeros typically has two phases. These consist of an initial fast monotonic reduction of the L 2 error norm followed by a very slow asymptotic convergence. Although the norm of the tracking error does eventually converge to zero, the practical implications over finite trials is apparent convergence to a non-zero error. The source of this slow convergence is identified and a model of this behavior as a (set of) linear constraint(s) is developed. This is shown to provide a good prediction of the magnitude of error norm where slow convergence begins. Formulae for this norm are obtained for single-input single-output systems with several right half plane zeroes using Lagrangian techniques and experimental results are given that confirm the practical validity of the analysis.

关键词： Convergence Approximation methods Cost function Hilbert space Algorithm design and analysis Mathematical model Predictive models

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Resonant current regulation for transformerless hybrid active filter to suppress harmonic resonances in industrial power systems

Resonant current regulation for transformerless hybrid activ...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： Tzung-Lin Lee Yen-Ching Wang Josep M. Guerrero Department of Electrical Engineering National Sun Yat-sen University Kaohsiung Taiwan Department of Automatic Control Systems and Computer Engineering Technical University of Catalonia Barcelona Spain

ISBN: (纸本)9781424447824

Severe harmonic distortion, due to unintentional series or parallel resonance of the passive filters or power factor correction capacitors, is a significant issue in the industrial power system. The transformerless hybrid active filter, which operates at reduced kVA rating and switching ripples, is a promising filtering solution in high-power applications. This paper presents resonant current regulation for the transformerless hybrid active filter to enhance its suppressing capability of harmonic resonances. The proposed current regulator is composed of various band-pass filters in parallel connection to resonate at harmonic frequencies for accurately controlling the active filter as variable harmonic conductance. The current tracking capability of the active filter and the associated damping performance can be improved without increasing overall gain of controller. Therefore, the harmonic resonance can be definitely avoided and the damping conductance can be dynamically adjusted to conform with the harmonics limitation. In addition, the required damping conductance to maintain the harmonic voltage at an allowable level is reduced, compared with proportional control only. Operational principles are detailed and computer simulations are provided to validate the effectiveness of the proposed approach.

关键词： Resonance Current control Active filters Power system harmonics Power harmonic filters Industrial power systems Damping Band pass filters Harmonic distortion Passive filters

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Phase synchronization through entrainment by a consensus input

Phase synchronization through entrainment by a consensus inp...

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IEEE Conference on Decision and control

作者： Peter Wieland Gerd S. Schmidt Rodolphe Sepulchre Frank Allgöwer Institute for Systems Theory and Automatic Control University of Stuttgart Germany Department of Electrical Engineering and Computer Science University of Liège Belgium

The paper proposes a synchronization mechanism in a set of nonlinear oscillators interconnected through a communication network. In contrast to many existing results, we do not employ strong, diffusive couplings between the individual oscillators. Instead, each individual oscillator is weakly forced by a linear resonator system. The resonator systems are synchronized using results from consensus theory. The synchronized resonator systems force the frequencies of the nonlinear oscillators to a constant frequency and thereby yield synchronization of the oscillators. We prove this result using the theory of small forcings of stable oscillators. This synchronization scheme allows for synchronization of nonlinear oscillators over uniformly connected communication graphs.

关键词： Oscillators Synchronization Couplings Orbits Harmonic analysis Convergence Manifolds

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