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European control Conference (ECC)

作者： Csaba Fazekas Attila Gábor Katalin M. Hangos Process Control Research Group Computer and Automation Research Institute Budapest Hungary

A simple dynamic model of a nuclear reactor with temperature dependent reactivity and six groups of neutron emitting nuclei is developed in this paper based on first engineering principles. The proposed model contains the possible minimal number of differential equations and it is capable of describing important dynamic phenomena such as load change transients between day and night periods. Because the model is nonlinear in its parameters, an optimization-based parameter estimation procedure has been applied by using the Nelder-Mead algorithm and measured data from the Paks Nuclear Power Plant. The estimated parameter values fall into physically meaningful ranges and the response of the constructed reactor model shows a good fit to the measurement data.

关键词： Neutrons Mathematical model Inductors Temperature measurement Load modeling Fuels Integrated circuit modeling

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Fault-tolerant Internal Model control with application to a diesel engine

Fault-tolerant Internal Model Control with application to a ...

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作者： Hilsch, Michael Jan, Lunze Nitsche, Rainer Robert Bosch GmbH Corporate Sector Research and Advance Engineering Stuttgart Germany Institute of Automation and Computer Control Ruhr-Universität Bochum Bochum Germany

ISBN: (纸本)9783902661463

The paper proposes a new structure for fault-tolerant control of nonlinear systems subject to persistent faults. The principle of Internal Model control (IMC) is extended to ensure fault tolerance with respect to faults that do not affect the plant stability. The method is based on a representation of sensor, actuator and plant faults as parameter changes of the plant model, which is part of the IMC control law. It is proved that the IMC control loop, which is extended by a diagnostic unit, tolerates substantial faults and ensures the nominal loop performance unless the fault changes the structure of the nonlinear plant. These results are illustrated for the air path of a Diesel engine. © 2009 IFAC.

关键词： Diesel engines

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Extended TP model transformation for polytopic representation of impedance model with feedback delay

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WSEAS Transactions on Systems and control 2010年第9期5卷 701-710页

作者： Galambos, Péter Baranyi, Péter Korondi, Péter Computer and Automation Research Institute Hungarian Academy of Sciences Cognitive Informatics Group Kenede u. 13-17 H-1111 Budapest Hungary Budapest University of Technology and Economics Dept. of Manufacturing Science and Technology Kenede u. 13-17 H-1111 Budapest Hungary Budapest University of Technology and Economics Dept. of Telecommunications and Media Informatics Kenede u. 13-17 H-1111 Budapest Hungary Budapest University of Technology and Economics Dept. of Mechatronics Optics and Engineering Informatics Kenede u. 13-17 H-1111 Budapest Hungary

In force controlled industrial robots, haptic and telemanipulation devices stability and control performance are contradicting requirements. In distributed systems where the sensors, actuators and control logic are separated in space, due to the network delays the control process may become unstable. In our research, we consider the coupled impedance type control algorithms as common used method in telemanipulation and interaction control of robots. In this paper, an extended TP model transformation is proposed to convert the delayed system into a polytopic tensor product (TP) model considering the value of the feedback delay as a parameter. Using such model, controller design become tractable as it does not contain feedback delay. A numerical example for a single degree of freedom impedance model with feedback delay is discussed. The results are confirmed by simulation.

关键词： Industrial robots

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Cross-layer design of wireless networked control systems with energy limitations 10

Cross-layer design of wireless networked control systems wit...

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2009 10th European control Conference, ECC 2009

作者： Chamaken, A. Litz, L. Kraemer, M. Gotzhein, R. Institute of Automatic Control Electrical Engineering and Information Technology University of Kaiserslautern Germany Networked Systems Research Group Computer Science University of Kaiserslautern Germany

ISBN: (纸本)9783952417393

A new approach to the cross-layer design of wireless networked control systems under limited computing and energy resources is presented. The idea is to provide a methodology that jointly takes the aspects of control e.g. control algorithms, Communication e.g. communication protocols, and Computation e.g. energy consumption into consideration. The design objective is the predictability and optimization of the control performance for a given control application. The control performance is a complex function of network parameters e.g. delay, packet loss, network throughput and control system parameters e.g. sampling period, control algorithm. control performance predictability and optimization can only be achieved by imposing requirements on the wireless network design. A cross-layer design methodology is shown to be very useful for this purpose. To illustrate the methodology, an inverted pendulum system with low-energy wireless network is used for the cross-layer design of control algorithms and communication protocols under computing and energy constraints. © 2009 EUCA.

关键词： Energy utilization

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Signal and system representations on hyperbolic groups: Beyond rational orthogonal bases

Signal and system representations on hyperbolic groups: Beyo...

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IEEE 7th International Conference on Computational Cybernetics, ICCC 2009

作者： Soumelidis, Alexandros Bokor, József Schipp, Ferenc Computer and Automation Research Institute Hungarian Academy of Sciences Kende 13-17 Budapest H-1111 Hungary Computer and Automation Research Institute Control Engineering Research Group Hungarian Academy of Sciences Kende 13-17 Budapest H-1111 Hungary Department of Numerical Analysis Faculty of Informatics Eötvös Loránd University Pazmany Peter Setany 1/C Budapest H-1117 Hungary

ISBN: (纸本)9781424453115

This paper investigates signal and system representations in special rational orthogonal bases of the Hardy space H2. These bases are derived from the Blaschke-group associated to the hyperbolic group SH(n) of matrices. Using the concept of the unitary group representations over H 2, and the voice-transform, specific hyperbolic wavelet constructions - Blaschke-wavelets and the associated Blaschke-Fourier transform are constructed. State space representations of systems over hyperbolic groups are discussed, too, with the purpose to explore the perspectives of elaborating a unified system theory upon this conceptual base. ©2009IEEE.

关键词： State space methods

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Dynamical Modeling and Identification of a GnRH neuron *

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IFAC Proceedings Volumes 2009年第12期42卷 425-430页

作者： Dávid Csercsik Gábor Szederkényi Katalin M. Hangos Imre Farkas Process Control Research Group Systems and Control Laboratory Computer and Automation Research Institute HAS Budapest Hungary Department of Endocrine Neurobiology Institute of Experimental Medicine HAS Budapest Hungary

GnRH neurons, as key elements of the reproductive neuroendocrine system, have important central regulating role in the dynamics of the hormonal cycle. A Hodgkin-Huxley type neural model is proposed in this paper, that takes into account up-to-date biological literature data related to ion channels. The proposed neuron model is highly nonlinear in parameters and the evaluation of the objective function is computationally expensive, therefore the asynchronous parallel pattern search (APPS) procedure has been used for identification. The model with high number of estimated parameters provides a qualitatively good fit of both voltage clamp and current clamp traces.

关键词： Neural dynamics Dynamic modelling Identification Nonlinear systems

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Modeling and identification of a nuclear reactor with temperature effects and Xenon poisoning

Modeling and identification of a nuclear reactor with temper...

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Annual Conference of Industrial Electronics Society

作者： Attila Gábor Csaba Fazekas Gábor Szederkényi Katalin M. Hangos Process Control Research Group Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

This paper presents the modeling and identification procedure for a VVER-type pressurized water reactor. The modeling goal is to produce a mathematical description in nonlinear state-space form that is suitable for control-oriented model analysis and preliminary controller design experiments. The proposed model takes temperature effects and xenon poisoning into consideration and thus it is an extension of formerly published simpler model structures. Real transient measurement data from the plant has been used for the identification that is based on standard prediction error minimization. It is shown that the model is fairly well identifiable and the newly inserted model components significantly improve the quality of fit between the measured and computed model outputs. Furthermore, the estimated parameter values fall into physically meaningful ranges.

关键词： Temperature Xenon Inductors Neutrons Parameter estimation Power system modeling Steady-state Mathematical model Power generation Delay

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Three-dimensional bioluminescence tomography based on bayesian approach

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Optics Express 2009年第19期17卷 16834-16848页

作者： Feng, Jinchao Jia, Kebin Qin, Chenghu Yan, Guorui Zhu, Shouping Zhang, Xing Liu, Junting Tian, Jie College of Electronic Information and Control Engineering Beijing University of Technology China Medical Image Processing Group Institute of Automation Chinese Academy of Sciences P. O. Box 2728 Beijing 100190 China China Life Science Research Center Xidian University Xi'an 710071 China

Bioluminescence tomography (BLT) poses a typical ill-posed inverse problem with a large number of unknowns and a relatively limited number of boundary measurements. It is indispensable to incorporate a priori information into the inverse problem formulation in order to obtain viable solutions. In the paper, Bayesian approach has been firstly suggested to incorporate multiple types of a priori information for BLT reconstruction. Meanwhile, a generalized adaptive Gaussian Markov random field (GAGMRF) prior model for unknown source density estimation is developed to further reduce the ill-posedness of BLT on the basis of finite element analysis. Then the distribution of bioluminescent source can be acquired by maximizing the log posterior probability with respect to a noise parameter and the unknown source density. Furthermore, the use of finite element method makes the algorithm appropriate for complex heterogeneous phantom. The algorithm was validated by numerical simulation of a 3-D micro-CT mouse atlas and physical phantom experiment. The reconstructed results suggest that we are able to achieve high computational efficiency and accurate localization of bioluminescent source. © 2009 Optical Society of America.

关键词： Finite element method

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Discrete time minimax tracking control with disturbance estimation 10

Discrete time minimax tracking control with disturbance esti...

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2009 10th European control Conference, ECC 2009

作者： Bauer, Peter Kulcsar, Balazs Bokor, Jozsef Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences BudapestH-1111 Hungary Delft Center for System and Control Faculty of Mechanical Maritime and Materials Engineering Technical University of Delft Mekelweg 2 Delft Netherlands

ISBN: (纸本)9783952417393

The paper proposes an alternative way to solve robust reference tracking problem. Instead of rejecting the effect of the disturbance directly, an intermediate step is built into the state estimation problem. The advantage of the methodology is to elaborate a modified optimal state estimation problem taking the unbiased estimate of the disturbance into account. Henceforward, the solution of the discrete time, optimal LQ minimax tracking problem is modified and subjected to attenuate the disturbance residual. The paper addresses the nominal case for constant reference and disturbance signal showing the asymptotical stability and the tracking performance of the discrete time, optimal min-max control. Suboptimal solution is given for time varying reference and disturbance signal. A linearized hovering quadrotor example demonstrates the importance of the suggested technique. © 2009 EUCA.

关键词： State estimation

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Estimating the state of distributed dynamical systems based on limited measurements by means of cooperative filtering with application to ad-hoc vehicle networks

Estimating the state of distributed dynamical systems based ...

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7th IFAC International Symposium on Fault Detection, Supervision and Safety of Technical Systems, SAFEPROCESS'09

作者： Edelmayer, A. Miranda, M. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Hungary Faculty of Engineering University of Los Andes Merida Venezuela

ISBN: (纸本)9783902661463

In this paper a decentralized approach to state estimation of distributed dynamical systems over unreliable communication network subject to uncertain and limited measurements is addressed. Specifically, a distributed filtering concept for enhancing the estimation accuracy of vehicles state from uncertain position data in ad-hoc vehicle networks is presented. The filter relies on a variety of position measurements obtained from the on-board vehicle positioning system, from other nearby cooperating vehicles, as well as from the immediate roadside environment via communication. Direct distance measurements between vehicles as well as between vehicles and the static elements of the roadside infrastructure can be used, if available, as highly accurate reference measurements. The paper demonstrates how successfully the idea of cooperative filtering in addressing the demands of both sensor fault tolerance and enhanced estimation accuracy in distributed systems over ad-hoc communication networks can be used. © 2009 IFAC.

关键词： State estimation

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