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Vehicle Parameter Estimation and Stability Enhancement

IFAC Proceedings Volumes 2008年第2期41卷 5700-5705页

作者： Hassan Shraim Mustapha Ouladsine Leonid Fridman Laboratory of sciences of informations and of systems LSIS UMR 6168 University of Paul Czanne Aix-Marseille III Av escadrille de Normandie Niemen 13397 Marseille Cedex 20 Department of Control Division of Electrical Engineering Engineering Faculty National Autonomous University of Mexico(UNAM) Ciudad Universitaria 04510 D.F. Mexico

In this paper, high order sliding mode observers are used to estimate tires longitudinal forces, vehicle side slip angle and velocities. Two types of high order sliding mode observers are used. A third order one is used to estimate the longitudinal forces, while for the estimation of the vehicle side slip and velocities, an observer based on the super twisting algorithm is proposed. Validations with the simulator ve-dyna pointed out the good performance and the robustness of the proposed observers. controller design for the braking is accomplished using a reduced state space model representing the movement of the vehicle center of gravity in the (X, Y ) plane. Driver's reactions are taken into account. The performance of the closed loop system is carried out by means of simulation tests.

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Output feedback control of linear systems with input and output quantization

Output feedback control of linear systems with input and out...

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IEEE Conference on Decision and control

作者： Daniel Coutinho Minyue Fu Carlos E. de Souza Group of Automation and Control Systems Faculty of Engineering Pontifícia Universidade Católica do Rio Grande do Sul Porto Alegre Brazil School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW Australia Department of Systems and Control Laboratory Nacional de Computação Científica Petropolis Rio de Janeiro Brazil

ISBN: (纸本)9781424431236

A considerable amount of research has been done on the use of logarithmic quantizers for networked feedback control systems. However, most results are developed for the case of a single quantizer (either measurement or control signal quantization). In this paper, we investigate the case of simultaneous input and output quantization for SISO linear output feedback systems. Firstly, we show that the problem of quadratic stabilization via quantized feedback can be addressed with no conservativeness by means of the sector bound approach. Secondly, we provide a bound on the maximal admissible sector bound via a scaled H ¿ optimization problem.

关键词： Output feedback Linear feedback control systems control systems Linear systems Quantization Communication system control Feedback control Communication channels Digital control Bandwidth

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Impact of the Competitive Environment on the Generating Units Maintenance

Impact of the Competitive Environment on the Generating Unit...

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International Conference on Power System Technology (POWERCON)

作者： I. Kuzle H. Pandzic S. Tesnjak Senior Member IEEE Assistant Professor. Student Member IEEE Postgraduate student Faculty of Electrical Engineering Department of Power Systems. Senior Member IEEE Full Professor of power plants and electric power dynamics and control.

Maintenance of the power generating facilities in due time is essential for economical and reliable operation of the power system. Economical aspects, which bring revenue, and technical aspects, which keep the power system above the desired level of reliability, have to be confronted and the cheapest solution, which complies with the strict technical limitations, has to be obtained. This paper addresses the problem of obtaining the optimal maintenance schedule for generating units. For this purpose, this paper discusses the mathematical programming method - Benders decomposition. After the brief description, an application of the Benders decomposition on the three Croatian hydroelectric power plants in a row on the River Drava is carried out.

关键词： Power system reliability Power generation Availability Power system economics Power generation economics Environmental economics Preventive maintenance Investments Power system modeling Power systems

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Chaotic behavior of new experimental data of the LTGP (2004-2006) confirm possible relation to seismic activity in Western Greece

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Journal of Physics: Conference Series 2008年第1期96卷

作者： Giannakopoulos, K. Ifantis, A. Electronics Laboratory Department of Physics University of Patras Patras 26500 Greece Digital Systems and Media Computing Laboratory Faculty of Sciences and Technology Hellenic Open University Patras 26222 Greece Control Systems and Signals Laboratory Department of Electrical Engineering Technological Educational Institute of Patras Patras 26334 Greece Seismological Laboratory Department of Geology University of Patras Patras 26500 Greece

Observations of the long-term geoelectric potential (LTGP) difference are presented in this paper. The data have been collected during a three-year (2004-2006) investigating period. Moreover, this paper constitutes a continuation of two previously published works with eleven-year (1993-2003) experimental data. For data logging purposes, an automatic system for collection, transfer and processing of geoelectric measurements operates at the Seismological Laboratory of the University of Patras. The analysis of these data using Lyapunov exponents and Takens estimator confirm their quite chaotic behavior. The Lyapunov exponents have also been calculated for short periods of twenty days, i.e. ten days before and ten days after the earthquakes occurred during this three-year period. By thorough examination of the resulting Lyapunov spectrums, it seems that these are subject to possible changes prior to an earthquake. © 2008 IOP Publishing Ltd.

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Multivariable control of a reduction furnace 8th

Multivariable control of a reduction furnace

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8th IFAC Symposium on Dynamics and control of Process systems, 2007

作者： Ramírez-Mendoza, Mercedes Albertos, Pedro Department of Automatic Control Faculty of Electrical Engineering Universidad de Oriente Santiago de Cuba Cuba Department of Systems Engineering and Control Universidad Politécnica de Valencia Spain

In the world of control the enormous difficulties encountered in reaching satisfactory results with the design and implementation of controllers for Multi-Input/Multi-Output (MIMO) processes are well known, in particular;when the interactions can not be ignored. This situation becomes even more complicated when the control process exhibits non-linear and/or time-varying dynamic characteristics. Not uncommonly, system designers of industrial processes control have to face such complexities. This paper describes the experience attained by the authors in the design of a fuzzy control system for a reduction furnace in a nickel processing plant, which exhibits the above mentioned characteristics. © Copyright 2007 IFAC.

关键词： Fuzzy control

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MULTIVARIABLE control OF A REDUCTION FURNACE

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IFAC Proceedings Volumes 2007年第5期40卷 231-236页

作者： Mercedes Ramírez-Mendoza Pedro Albertos Department of Automatic Control Faculty of Electrical Engineering Universidad de Oriente. Santiago de Cuba Cuba Department of Systems Engineering and Control Universidad Politécnica de Valencia. España

In the world of control the enormous difficulties encountered in reaching satisfactory results with the design and implementation of controllers for Multi-Input/Multi-Output (MIMO) processes are well known, in particular; when the interactions can not be ignored. This situation becomes even more complicated when the control process exhibits non-linear and/or time-varying dynamic characteristics. Not uncommonly, system designers of industrial processes control have to face such complexities. This paper describes the experience attained by the authors in the design of a fuzzy control system for a reduction furnace in a nickel processing plant, which exhibits the above mentioned characteristics.

关键词： Fuzzy control fuzzy controller reduction multihearth furnace multivariable systems

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Integral Input-to-State Stability of the Drive-Train of a Wind Turbine

Integral Input-to-State Stability of the Drive-Train of a Wi...

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Proceedings of the 46th IEEE Conference on Decision and control, Pages 1-459

作者： Chen Wang George Weiss Department of Electrical and Electronic Engineering Imperial College Control and Power Research Group London UK The Department of Electrical Engineering-Systems Faculty of Engineering Tel-Aviv University Israel

ISBN: (纸本)9781424414970;1424414970

This paper investigates the stability of a variable-speed wind turbine operating under low to medium wind speed. The turbine is controlled to capture as much wind energy as possible. We concentrate on the mechanical level of the turbine system, more precisely on the drive-train with the standard quadratic generator torque controller. We consider the two-mass model for the drive-train, with the inputs being the deviation of the active torque from an arbitrary positive nominal value and the tracking error of the generator torque. We show that the turbine system is integral input-to-state stable.

关键词： Wind Energy Conversion systems steam turbine system turbines Variable speed integration Generator dynamos Torque torque controller

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A fuzzy logic based approach to the SLAM problem using pseudolinear models with two sensors data association

A fuzzy logic based approach to the SLAM problem using pseud...

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International Conference on Information and Automation for Sustainability (ICIAfS)

作者： Chandima Dedduwa Pathiranage Lanka Udawatta Keigo Watanabe Kiyotaka Izumi Department of Advanced Systems Control Engineering Graduate School of Science and Engineering Saga University Japan Department of Electrical Engineering Faculty of Engineering University of Moratuwa Sri Lanka

ISBN: (纸本)9781424418992;9781424419005

This paper presents an alternative solution to simultaneous localization and mapping (SLAM) problem by applying a fuzzy Kalman filter using a pseudolinear measurement model of nonholonomic mobile robots. Takagi-Sugeno fuzzy model based on observation for nonlinear system is adopted to represent the process and measurement models of the vehicle-landmarks system. The complete system of the vehicle-landmarks model is decomposed into several linear models. Using the Kalman filter theory, each local model is filtered to find the local estimates. The linear combination of these local estimates gives the global estimate for the complete system. The simulation results prove that the new approach results in more anticipated performances, though nonlinearity is directly involved in the Kalman filter equations, compared to the conventional approach.

关键词： Fuzzy logic Simultaneous localization and mapping Motion control Fuzzy systems Mobile robots State estimation Vehicles Error correction Data engineering Nonlinear systems

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Kinematic simulative analysis of virtual potential field method for AUV trajectory planning

Kinematic simulative analysis of virtual potential field met...

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Mediterranean Conference on control and Automation (MED)

作者： M Barisic Z. Vukic N. Miskovic Department of Computer and Control Engineering Laboratory for Underwater Systems and TechnologiesFaculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper deals with an analysis of applicability, capabilities, benefits and pitfalls of using a virtual potential field approach to autonomously planning trajectories in non-communicating autonomous underwater vehicles (AUV-s). Virtual potentials represent an approach to this problem with cross-layer design features. Examples of different layers of control that can be achieved with the same fundamental approach are: obstacle-avoidance, energy-optimal trajectories, forming up with other moving agents, controlled formation fragmentation into well-posed sub-formation etc. This paper shows, on the basis of extensive simulated experiments, that such a trajectory planner based on virtual potentials, guarantees good extendibility, scalability and performance in a hard-real-time hardware-in-the-loop system.

关键词： Kinematics Analytical models Trajectory Computational modeling Computer simulation Electric variables measurement Feature extraction Stability Underwater vehicles Communication system control

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The Integral Input-to-State Stability of Passive Nonlinear systems

The Integral Input-to-State Stability of Passive Nonlinear S...

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Proceedings of the 46th IEEE Conference on Decision and control, Pages 1-459

作者： Chen Wang George Weiss Control & Power Research Group Department of Electrical and Electronic Engineering Imperial College London London UK Department of Electrical Engineering-Systems Faculty of Engineering Tel-Aviv University Israel

ISBN: (纸本)9781424414970;1424414970

This paper investigates the integral input-to-state stability property of passive nonlinear systems. We show that under mild assumptions, a passive nonlinear system which is globally asymptotically stable is also integral input-to-state stable. We illustrate the result by proving the integral input-to-state stability of the drive-train of a wind turbine with quadratic torque control.

关键词： Nonlinear systems integration Torque control Wind Energy Conversion systems stalls(animals)

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