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UKACC International Conference on control (control)

作者： A. N. K. Nasir M. O. Tokhi N. M. Abd Ghani M. A. Ahmad Department of Automatic Control & Systems Engineering University of Sheffield Sheffield UK The University of Sheffield Sheffield Sheffield GB Faculty of Electrical & Electronics Engineering Universiti Malaysia Pahang (UMP) Pekan Pahang Malaysia

ISBN: (纸本)9781467315593

This paper presents a hybrid optimization algorithm, referred to as hybrid spiral dynamics bacterial chemotaxis (HSDBC) algorithm. HSDBC synergizes bacterial foraging algorithm (BFA) chemotaxis strategy and spiral dynamics algorithm (SDA). The original BFA has higher convergence speed while SDA has better accuracy and stable convergence when approaching the optimum value. This hybrid approach preserves the strengths of BFA and SDA and thus has the capability of producing better results. Moreover, it has simple structure, hence reduced computational cost. Several unimodal and multimodal benchmark functions are employed to test the algorithm in finding the global optimum point. Furthermore, the proposed algorithm is tested in the design of PD controller for a flexible manipulator system. The results show that the HSDBC outperforms SDA and BFA in all test functions and successfully optimizes the PD controller.

关键词： Heuristic algorithms Microorganisms Optimization Spirals Convergence Algorithm design and analysis Manipulators

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An alternative EPSAC based control strategy for multivariable time delay processes

An alternative EPSAC based control strategy for multivariabl...

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IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR

作者： Cristina Ioana Pop Clara M. Ionescu Robin De Keyser Eva Henrietta Dulf Honoriu Valean Adrian Neaga Cosmin Darab Department of Automatic Control Technical University of Cluj Napoca Cluj-Napoca Romania Faculty of Engineering and Architecture EeSA-Department of Electrical energy Systems and Automation Ghent University Gent Belgium

Multivariable time delay processes are difficult to control due to the input-output interactions, as well as multiple time delays that complicate the controller design process. The proposed method presented in this paper consists of a dynamic decoupling strategy - compared to the more general used steady state decoupling techniques - and a delay time compensation (DTC) structure in which the controller is designed based on the Extended Prediction Self Adaptive control (EPSAC) approach. The main concern regarding the proposed method is directed towards the possible lack of robustness against time delay variations - a problem that is frequently encountered in DTC structures. Moreover, the decoupling technique implemented consists in adding supplementary time delay to some input channels of the MIMO process, which may result in a worsening of the robustness problems. The simulations presented show that the proposed method can ensure robust stability and robust performance even for significant time delay variations.

关键词： Delay effects Process control Delay Carbon Robustness Isotopes MIMO

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Sentiment Analysis of Health and Nutrition Tweets using Support Vector Machines

Sentiment Analysis of Health and Nutrition Tweets using Supp...

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2012年互联网技术与应用国际学术会议

作者： Tarek Helmy Information and Computer Science Department College of Computer Science and EngineeringKing Fahd University of Petroleum and MineralsDhahran 31216Mail Box.413Saudi Arabia Faculty of Engineering Department of Computers Engineering & Automatic ControlTanta UniversityEgypt

Sentiment analysis refers to a broad area of natural language processing,computational linguistics and text mining.A successful sentiment analysis model based on Twitter,the popular social networking and micro blogging service,could provide useful information to the Internet users due to its realtime *** instance,Twitter can be a resource for people interested in staying up on diet and *** work is a part of a project where we are developing a framework for semantic manipulation of health and nutrition *** analysis and classification are keys to the intelligent search process especially in a critical area like health and nutrition. Sentiment analysis in this paper refers to the task of classifying opinionated health and nutrition tweets as either positive or negative according to the overall sentiment expressed by the *** paper presents an experimental study of using support vector machines for sentiment analysis in the health and nutrition domain of *** results demonstrate the applicability of support vector machines to Twitter sentiment analysis and emphasize the importance of preprocessing due to the unique attributes of tweets.

关键词： Sentiment Analysis and Classfication Natural Language Processing Support Vector Machines

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Experimental verification of constrained iterative learning control using successive projection

Experimental verification of constrained iterative learning ...

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2012 UKACC International Conference on control, control 2012

作者： Chu, Bing Cai, Zhonglun Owens, David H. Rogers, Eric Freeman, Chris T. Lewin, Paul L. Electronics and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom Faculty of Engineering and the Environment University of Southampton Southampton SO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD United Kingdom Italian Institute of Technology Via Morego 30 16163-Genova Italy

ISBN: (纸本)9781467315609

In many practical applications, constraints are often present on, for example, the magnitudes of the control inputs. Recently, based on a novel successive projection framework, two constrained iterative learning control (ILC) algorithms were developed with different convergence properties and computational requirements. This paper investigates the effectiveness of these two methods experimentally on a gantry robot facility, which has been extensively used to test a wide range of linear model based ILC algorithms. The results obtained demonstrate the effectiveness of the algorithms in solving one form of the general constrained ILC problem. © 2012 IEEE.

关键词： Iterative methods

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Experimental verification of constrained iterative learning control using successive projection

Experimental verification of constrained iterative learning ...

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UKACC International Conference on control (control)

作者： Bing Chu Zhonglun Cai David H Owens Eric Rogers Chris T Freeman Paul L Lewin Electronics and Computer Science University of Southampton Southampton UK Faculty of Engineering and the Environment University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK Italian Institute of Technology Genoa Italy

关键词： Convergence Robots Algorithm design and analysis Prediction algorithms Trajectory Optimization

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Comparison of three phase 4-leg shunt active power filter algorithms

Comparison of three phase 4-leg shunt active power filter al...

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2011 International Aegean Conference on Electrical Machines and Power Electronics, ACEMP 2011 and Electromotion 2011 Joint Conference

作者： Ciprian, Balanuta Gelu, Gurguiatu Toader, Munteanu Grigore, Fetecau Department of Automatic Control and Electrical Engineering Faculty of Automatic Control Computers Electrical and Electronics Engineering DunǍrea de Jos University Galati Romania

ISBN: (纸本)9781467350037

Diversity of loads, resistive and inductive, monophase and three phase, balanced and unbalanced, developed with power electronics or not, led to power quality problems at consumer level. Problems that can be resolved locally with active or passive filters connected on loads terminal or global, by connecting in CCP (Common Coupling Point) a four wire three phase shunt active power filter (APF), solution chosen for this study. This paper presents a comparison between three control algorithms of a three phase 4-wire 4-leg active power filter. Comparative analysis was made based on the level of THD, power factor and unbalance level. The results were obtained by simulation in Matlab/Simulink software. © 2011 IEEE.

关键词： Passive filters

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Implementing optimal hydrogen networks management

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IFAC Proceedings Volumes 2012年第15期45卷 114-119页

作者： C. de Prada G. Gutierrez D. Sarabia E. Gómez C.A. Méndez J.M. Sola R. González Dpt. of Systems Engineering and Automatic Control Faculty of Sciences University of Valladolid c/ Real de Burgos 47011 Spain INTEC (UNL- CONICET) Güemes 3450-3000 Santa Fe Argentina (Repsol – YPF) Edificio Muñatones c/ San Martín 5 48550 Muskiz Vizcaya Spain

This paper describes an approach to optimal management of hydrogen networks in refineries, focusing on the problems of reconfiguration that appears when, due to plant failures, the production of the hydrogen generating units suddenly decreases. The problem is formulated in terms of optimization as a MINLP one. Also, guidelines to the implementation of the optimum are presented with the aim of providing a practical solution to the inherent uncertainly and changing dynamics associated to the process.

关键词： Hydrogen distribution networks RTO MINLP optimization process control data reconciliation

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Sliding-mode control of coordinated nonholonomic mobile manipulators

Sliding-mode control of coordinated nonholonomic mobile mani...

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15th International Conference on System Theory, control and Computing, ICSTCC 2011

作者： Solea, Razvan Cernega, Daniela Cristina Faculty of Automatic Control Computers Electrical and Electronics Engineering Dunarea de Jos University of Galati Romania

ISBN: (纸本)9781457711732

Coordinated systems of multiple mobile manipulators can be much more flexible than single mobile manipulator in order to accomplish complex and changeable tasks. In this paper, sliding-mode control strategies are used to control the coordinated multiple mobile manipulators which carry a common object. The control ensures that the output tracking errors of the system converge to zero. Simulation studies show the effectiveness of the proposed scheme. © 2011 faculty of Auto control.

关键词： Manipulators

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The (J, J′)-spectral factorization of a general discrete-time system

The (J, J′)-spectral factorization of a general discrete-ti...

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作者： OarǍ, Cristian Andrei, Raluca Faculty of Automatic Control and Computers University Politehnica Bucharest Bucharest Romania Delft Center for Systems and Control Delft University of Technology Delft Netherlands

ISBN: (纸本)9781457700804

For a discrete-time system whose transfer matrix function is completely general (arbitrary normal rank, strictly proper/imprope/polynomial, with poles and zeroes on the unit circle) we give existence conditions and constructive formulas for the (J, J′)-spectral factor. The computation of the spectral factor is done by employing generalized state-space realizations and numerically-sound algorithms based on a preliminary unitary projection which delineates a subsystem fulfilling all regularity assumptions. En route, we give formulas for the J-lossless conjugation of an arbitrary discrete-time system and the (J, J′)-lossless factorization of a marginally stable but otherwise general system. © 2011 AACC American automatic control Council.

关键词： Factorization

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Design of tensegrity structures: The kinematic method with forces in structural members

Design of tensegrity structures: The kinematic method with f...

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13th International Conference on Civil, Structural and Environmental engineering Computing, CC 2011

作者： Abdulkareem, M. Mahfouf, M. Theilliol, D. Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom Faculty of Science and Technology Nancy University France

ISBN: (纸本)9781905088454

The advantage of the well-known kinematic form-finding method of tensegrity structures is its simplicity and possibility to include length constraints on structural members. The stability of the structures obtained using this method is, however, not guaranteed because it takes no account of the forces in structural members. In this paper, it will be shown that this method inherently assume that the magnitudes of force-to-length ratios in all cables and bars are equal. Thus, an approach for obtaining the optimal set of force-to-length ratios for a given tensegrity configuration that can be used with the kinematic form-finding methods for tensegrity structures for improved stability will be presented. The new approach will be described with an example. © Civil-Comp Press, 2011.

关键词： Nonlinear programming

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