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作者： Garrido, I. Garrido, A.J. Sevillano, G. Alberdi, M. Amundarain, M. Barambones, O. Dept. Automatic Control and Systems Engineering Basque Country University EUITI de Bilbao Plza. de la Casilla 3 48012 Bilbao Spain Dept. Automatic Control and Systems Engineering Basque Country University EUITI de Vitoria Nieves Cano 12 01006 Vitoria-Gasteiz Spain

ISBN: (纸本)9783902661555

Nuclear fusion has the potential to produce unlimited, clean energy, which presents itself as a reliable energy supply but it also helps to stop the threat of climate change that faces the world nowadays. However, to sustain the pulse duration long enough to produce the necessary energy, new controls have to be developed, composing a new application area of control engineering, with new and interesting challenges for the control community. In this sense, this paper deals with the modeling of tokamak nuclear fusion reactors. In order to control the creation of unstable modes in fusion processes, it is necessary to derive numerical models suitable for control strategies. The model presented in this paper addresses flux and energy conservation issues, discussing the mechanisms behind the creation of uncontrollable modes. The dynamics of the system is given by means of the energy functions which are solved for the currents in the structure, plasma current and plasma position. Thus, the equations for the state variables are derived based on the Hamiltonian equation of motion. In order to solve this system numerically, this model is linearized around an operation point by taking a Newton-Raphson step. Besides, the system output is completed by considering the equations for the flux and the poloidal field. Finally, the resulting low-order linear model is modified so as to obtain the corresponding state-space model which is verified by means of numerical experiments.

关键词： Equations of motion

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Energy-aware sensor selection and scheduling in wireless sensor networks

Energy-aware sensor selection and scheduling in wireless sen...

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1st IFAC Workshop on Estimation and control of Networked systems, NecSys'09

作者： Bitar, Eilyan Baeyens, Enrique Poolla, Kameshwar Dept. of Mechanical Engineering University of California Berkeley CA 94720 United States Dept. of Systems Engineering and Automatic Control University of Valladolid Paseo del Cauce s/n 47011 Valladolid Spain

ISBN: (纸本)9783902661524

This paper is concerned with system level energy management in wireless sensor networks. The network is required to conduct certain tasks which require information from individual sensors to be sent to a base station. Sensors cease functioning when they deplete their energy reserves or may fail abruptly due to random malfunctions. Sensor selection refers to the number of times sensors are interrogated, while sensor scheduling refers to the sequence in which these interrogations are conducted. A sensor management layer that isolates the system objectives from selection/scheduling is proposed. It is shown that sensor selection reduces to integer linear programming. Sensor scheduling is necessary when random sensor failures are considered or when the task definition is not stationary. Some general principles emerge. If all sensors are equally reliable, the optimal policy is to use the most energetic sensors first. If all sensors are equally energetic, the optimal policy is to use the least reliable sensor first. © 2009 IFAC.

关键词： Wireless sensor networks

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Digital watermarking for volume data based on 3D-DWT and 3D-DCT 09

Digital watermarking for volume data based on 3D-DWT and 3D-...

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2nd International Conference on Interaction Sciences: Information Technology, Culture and Human, ICIS 2009

作者： Liu, Wang Zhao, Chunhui Information and Communication Engineering College Harbin Engineering University Harbin Heilongjiang 150001 China Dept. of Automatic Test and Control Harbin Institute of Technology Harbin Heilongjiang 150001 China

ISBN: (纸本)9781605587103

With the rapid development of computer multimedia, how to protect digital products from being copied, pirated and juggled has been an urgent issue in the information security field. Digital watermarking is a new method to solve the referred problems. This paper proposes a gray-level digital watermarking algorithm for volume data based on three-dimension discrete wavelet transform (3D-DWT), three-dimension discrete cosine transform (3D-DCT) and spread-spectrum communication techniques. The embedded watermark is not only invisible but also resistant to the common attacks such as cropping, adding noise, and filtering. The validity of proposed algorithm has been confirmed with experiments. Copyright © 2009 ACM.

关键词： Discrete cosine transforms

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A Sensorless Vector control of Induction Motor Drives based on Artificial Neural Networks

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IFAC Proceedings Volumes 2009年第8期42卷 185-190页

作者： Oscar Barambones Dept. of Automatic Control and System Engineering. University of the Basque Country. EUI. Nieves cano 12. Vitoria. Spain

This paper presents a speed control of an induction motor. The design uses an feedforward Artificial Neural Network (ANN) to implement a rotor speed estimator, and a robust control strategy based on the sliding-mode. The proposed control scheme also make use of the field oriented control theory to simplify the proposed control design. The stability analysis of the presented control scheme is provided using the Lyapunov stability theory. Finally simulated results show that the presented controller with the proposed observer provides high-performance dynamic characteristics and that this scheme is robust with respect to plant parameter variations and external load disturbances.

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Optimizing hybrid control trajectories by model abstraction and refinement

Optimizing hybrid control trajectories by model abstraction ...

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作者： Paschedag, Tina Fall, Michael Stursberg, Olaf Institute of Control and System Theory Dept. of Electrical Engineering and Computer Science University of Kassel Germany Technische Universität München Germany

ISBN: (纸本)9783902661593

Techniques for optimal control of hybrid systems have to consider the complex interaction of continuous and discrete dynamics and are required to limit the computational complexity arising from the corresponding search spaces. This contribution proposes an approach to computing hybrid optimal control trajectories based on an iterative model-abstraction and refinement scheme. The hybrid automaton is mapped to an abstract representation which is enriched by cost information gained from graph. Candidate solutions are computed on the abstract level and are mapped back to the level of the hybrid model, where they are validated. A refinement step guides the search for (sub-) optimal hybrid control trajectories. The proposed approach is implemented for the optimization of the start-up procedure for a chemical reactor.

关键词： Hybrid systems

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Safety Assessment of Driving Behavior in Multi-Lane Traffic for Autonomous Vehicles

Safety Assessment of Driving Behavior in Multi-Lane Traffic ...

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IEEE Intelligent Vehicles Symposium (IV)

作者： Matthias Althoff Olaf Stursberg Martin Buss Institute of Automatic Control Engineering (LSR) Technische Universitat Munchen Institute of Control and System Theory Dept. of Electrical Eng. University of Kassel

ISBN: (纸本)9781424435036

An approach for the safety assessment of planned trajectories of autonomous vehicles is presented. Due to the unsafe nature of road traffic, the proposed safety assessment is performed in a probabilistic setting, where the probability distributions of possible future positions of traffic participants are computed based on dynamic models. The underlying algorithms have to be efficient as they need to provide a safety level of the currently planned path while the vehicle is in operation. In order to achieve the necessary efficiency of computation, the dynamics of traffic participants is abstracted into Markov-chains. The approach considers vehicle dynamics, interaction between traffic participants, and lane changes in multi-lane traffic.

关键词： Safety assessment Autonomous Vehicles Driver Behavior Multilane Traffic Lane changing Probability distribution Road traffic

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control system design and small signal analysis of APWM resonant inverter for induction heating

Control system design and small signal analysis of APWM reso...

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2009 International Conference on Electric Power and Energy Conversion systems, EPECS 2009

作者： Helaimi, M. Bettayeb, M. Benghanem, M. Belmadani, B. Dept. of Electrical Engineering University of Hassiba Ben Bouali Chlef Algeria Electrical and Computer Engeneering Dept. College of Engeneering University of Sharjah United Arab Emirates Dep. of Automatic Control University of Mohamed Boudhiaf-Oran Algeria

ISBN: (纸本)9789948427155

This paper proposes an asymmetrical pulse width modulation (APWM) with frequency tracking control of full bridge series resonant inverter for induction heating application. In this method, APWM is used as power regulation, and phased locked loop (PLL) is used to attain zero-voltage-switching (ZVS) over a wide load range. The complete closed loop control model is obtained using small signal analysis. The validity of the proposed control is verified by simulation results.

关键词： Induction heating

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Experimental research and establishment of the model of the two-probe flatness error separation

Experimental research and establishment of the model of the ...

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2009 IEEE International Conference on Industrial Technology, ICIT 2009

作者： Lei, Zhang Xiumin, Yang Xiaofei, Li Peng, Guan Ke, Zhang School of Mechanical Engineering School of Automation Northeastern University Shenyang 110006 China Dept. Automatic Control Shenyang Institutes of Engineering Shenyang 110036 China Shenyang Jian Zhu University Shenyang 110168 China

ISBN: (纸本)1424435064

In the time domain, on the basis of two-probe straightness error separation technology, this paper gives a new measurement measuring the flatness error based on the error separation technology-the two-probe flatness error separation measurement. It also gives the principle of the two-probe flatness error separation measurement, establishes the corresponding mathematical models, and carries on the simulation analysis and experiment testifying. Theoretical simulation and experimental result have proved the correctness and effectiveness of the separation principle (1) after analyzing the data with the two-probe error separation measurement, we can obtain the flatness of the panel measured as well as the straight error of the guiding rail.(2) when measuring with the two-probe measurement, the accumulation error of the initial position of the sensors is linear, so it can not influent the assessment of the error.(3) the two-probe error separation technology uses less one or two probes than the flatness error separation technology with the three or four probes does, so it need not consider installing several sensors on a plane and eliminates the problem made by the non-linear accumulation error of the initial position of the sensors. Therefore, the two-probe flatness error separation measurement this paper gives can make the flatness error separation technology more applied.

关键词： Probes

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Adaptive regulation - Rejection of unknown multiple narrow band disturbances

Adaptive regulation - Rejection of unknown multiple narrow b...

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Mediterranean Conference on control and Automation (MED)

作者： Ioan Dore Landau Aurelian Constantinescu Marouane Alma Dept. of Automatic Control GIPSA-LAB France Electrical Engineering Dept Montréal Canada Dept. of Automatic Control GIPSA-LAB Saint-Martin d'Héres France

The paper presents a methodology for feedback adaptive control of active vibration systems in the presence of time varying unknown multiple narrow band disturbances. A direct adaptive control scheme based on the internal model principle and the use of the Youla-Kucera parametrization is proposed. This approach is comparatively evaluated with respect to an indirect adaptive control scheme based on the estimation of the disturbance model. The evaluation of the methodology is done in real time on an active suspension system and on an active vibration control system using an inertial actuator.

关键词： Narrowband Adaptive control Programmable control Transducers control systems automatic control Feedback Vibration control White noise Adaptive signal processing

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Robust model predictive control of continuous-time sampled-data nonlinear systems with integral sliding mode 10

Robust model predictive control of continuous-time sampled-d...

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2009 10th European control Conference, ECC 2009

作者： Rubagotti, M. Raimondo, D.M. Ferrara, A. Magni, L. Dept. of Computer Engineering and Systems Science University of Pavia Via Ferrata 1 Pavia27100 Italy Automatic Control Laboratory Swiss Federal Institute of Technology Physikstrasse 3 Zürich8092 Switzerland

ISBN: (纸本)9783952417393

A hierarchical Nonlinear Model Predictive control (NMPC) scheme with guaranteed Input-to-State-practical-Stability (ISpS) is proposed. The controller is formed by an Integral Sliding Mode (ISM) controller and a NMPC one. The ISM, relying on the knowledge of the nominal continuous-time model of the system and of the piecewise constant control signal generated by the NMPC produces a control action aimed at reducing the difference between the dynamics of the nominal closed-loop system and the actual evolution of the state. The NMPC in this way can be designed based on a system with reduced uncertainty. In order to prove the stability of the overall control scheme, some general Regional ISpS results for continuous-time systems are proven. © 2009 EUCA.

关键词： Continuous time systems

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