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2003 European control Conference, ECC 2003

作者： Szederkényi, G. Schné, T. Hangos, K.M. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences P.O. Box 63 BudapestH-1518 Hungary Department of Computer Science University of Veszprém Egyetem u. 10 VeszprémH-8200 Hungary

ISBN: (纸本)9783952417379

The zero dynamics of simple continuous and fed-batch biore-actors is investigated in this paper for different input and output selections. A function λ generating the necessary coordinates transformation has been determined analytically for each case solving a simple PDE, and the resulting coordinates transformations have found to be invertible on the physically meaningful operating region. It is shown that that the investigated continuous and fed-batch bioreactors are globally minimum phase systems with the examined reaction rate function if the manipulable input is the inlet feed flow rate and the output is the substrate concentration. It is also shown that the zero dynamics may have multiple (locally stable and unstable) equilibria if the input is the inlet feed flow rate and the output is the biomass concentration. © 2003 EUCA.

关键词： Process control

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Nonlinear analysis and control of a continuous fermentation process

Nonlinear analysis and control of a continuous fermentation ...

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作者： Szederkényi, G. Kristensen, N.R. Hangos, K.M. Bay Jørgensen, S. Systems and Control Research Laboratory Computer and Automation Institute HAS P.O. Box 63 H-1518 Budapest Hungary Department of Chemical Engineering Technical University of Denmark DK-2800 Lyngby Denmark

Different types of nonlinear controllers are designed and compared for a simple continuous bioreactor operating near optimal productivity. This operating point is located close to a fold bifurcation point. Nonlinear analysis of stability, controllability and zero dynamics is used to investigate open-loop system properties, to explore the possible control difficulties and to select the system output to be used in the control structure. A wide range of controllers are tested including pole placement and LQ controllers, feedback and input-output linearization controllers and a nonlinear controller based on direct passivation. The comparison is based on time-domain performance and on investigating the stability region, robustness and tuning possibilities of the controllers. controllers using partial state feedback of the substrate concentration and not directly depending on the reaction rate are recommended for the simple fermenter. Passivity based controllers have been found to be globally stable, not very sensitive to the uncertainties in the reaction rate and controller parameter but they require full nonlinear state feedback. © 2002 Published by Elsevier Science Ltd.

关键词： Fermentation

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Input reconstruction by means of system inversion: Application to fault detection and isolation 15th

Input reconstruction by means of system inversion: Applicati...

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15th World Congress of the International Federation of Automatic control, 2002

作者： Szigeti, F. Bokor, J. Edelmayer, A. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 BudapestH-1111 Hungary Department of Control Engineering Faculty of Engineering University of Los Andes Mérida A.P. 11 La Hechicera Venezuela

ISBN: (纸本)9783902661746

This paper attempts to look at the fundamental problem of fault detection and isolation (FDI) in nonlinear systems. Using the idea of input reconstruction by means of dynamic inversion the authors first discuss the properties of input (or fault) observability in linear systems. The extension of the results to nonlinear systems as well as the mathematical conditions of the calculation of the inverse system, which provides the inverse in finite algorithmic steps, are given. The applicability of the inversion process to fault reconstruction in nonlinear systems is demonstrated. Copyright © 2002 IFAC.

关键词： Fault detection

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Model-based nonlinear control of a low-power gas turbine 15th

Model-based nonlinear control of a low-power gas turbine

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15th World Congress of the International Federation of Automatic control, 2002

作者： Ailer, P. Szederkényi, G. Hangos, K.M. Department of Aircraft and Ships Budapest University of Technology and Economics Stoczek u. 6. BudapestH-1111 Hungary Systems and Control Laboratory Computer and Automation Research Institute P.O. Box 63 BudapestH-1518 Hungary

ISBN: (纸本)9783902661746

A simple nonlinear controller for a low-power gas turbine based on direct passivation is proposed in this paper. It uses a nonlinear state space model of the gas turbine in input-affine form based on first engineering principles. It is found by standard nonlinear analysis that the developed model is reachable and observable in the whole application domain and stable in a small neighborhood of an operating point. Accordingly, the control aim is to guarantee the asymptotic stability of every operating points in the whole application domain and to provide suitable disturbance rejection. The proposed nonlinear controller is based on a prescribed quadratic Lyapunov-function and it is able to solve the protection of the gas turbine. The robustness of the closed-loop system with respect to the time-varying parameters is also investigated. Copyright © 2002 IFAC.

关键词： Gas turbines

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Three improvements on KNN-NPR for traffic flow forecasting

Three improvements on KNN-NPR for traffic flow forecasting

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International Conference on Intelligent Transportation

作者： Xiaoyan Gong Feiyue Wang Intelligent Control and Systems Engineering Center Institute of Automation Chinese Academy and Sciences Beijing China Institute of Automation Chinese Academy and Sciences Beijing China Advanced research in Complex Systems Department of Systems and Industrial Engineering of University of Arizona Tucson Tucson AZ USA

research has shown nonparametric regression to hold high potential to accurately forecast short-term traffic flows. However, many fundamental questions remain regarding the ability of KNN-NPR(K nearest neighbor nonparametric regression) to meet real-time system requirements and adequate accuracy requirements. So this paper puts forward three improvements which are: effective traffic state vector selection method based on self-association analysis and association analysis; improved variable K search method based on "dense degree"; and advanced data structures based on a dynamic cluster method and hash-function transformation. A field test fully proves that with three improvements, KNN-NPR can adequately meet real-time system requirements and accuracy requirements.

关键词： Traffic control Real time systems Intelligent transportation systems Accuracy Automatic testing Integrated circuit testing Senior members Filtering algorithms Parametric statistics Databases

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The automated lane-changing model of intelligent vehicle highway systems

The automated lane-changing model of intelligent vehicle hig...

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International Conference on Intelligent Transportation

作者： Lingxi Li Fei-Yue Wang Center for Intelligent Control and Systems Engineering Institute of Automation Chinese Academy and Sciences Beijing China Advanced research in Complex Systems Department of Systems and Industrial Engineering of University of Arizona Tucson AZ USA

Current traffic control and management systems are mainly macro-level vehicle coordination control models, not to take into account the factors of the individual car in the systems. This paper proposes an intelligent lane-changing model of the intelligent vehicle highway systems. This model is based on the traffic density distribution and safety control methods. Finally, we use simulation software to verify its feasibility and show that this model can achieve a higher traffic throughput and reduce the total travel time.

关键词： Intelligent vehicles Automated highways Traffic control Road transportation Automatic control Throughput Road vehicles Cellular neural networks Weight control Velocity control

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INPUT RECONSTRUCTION BY MEANS OF SYSTEM INVERSION: APPLICATION TO FAULT DETECTION AND ISOLATION

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IFAC Proceedings Volumes 2002年第1期35卷 13-18页

作者： F. Szigeti J. Bokor A. Edelmayer Department of Control Engineering Faculty of Engineering University of Los Andes Mérida A.p. 11 La Hechicera Venezuela Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Kende u. 13–17 H-1111 Hungary

关键词： Fault detection and isolation Input observability Input reconstruction Inverse system Linear and non-linear systems

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MODEL-BASED NONLINEAR control OF A LOW-POWER GAS TURBINE

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IFAC Proceedings Volumes 2002年第1期35卷 375-380页

作者： P. Ailer G. Szederkényi K.M. Hangos Department of Aircraft and Ships Budapest University of Technology and Economics H-1111 Budapest Stoczek u. 6. Hungary Systems and Control Laboratory Computer and Automation Research Institute H-1518 Budapest P.O. Box 63 Hungary

关键词： Nonlinear models Nonlinear control systems Transportation systems Vehicles Gas turbines

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Active suspension design based on mixed uncertainty modelling 6

Active suspension design based on mixed uncertainty modellin...

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6th European control Conference, ECC 2001

作者： Gaspar, P. Szaszi, I. Balas, G.J. Bokor, J. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 Budapest Hungary Department of Control and Transport Automation Budapest University of Technology and Economics Muegyetem rkp. 3 Budapest Hungary Department of Aerospace Engineering and Mechanics University of Minnesota 107 Akerman Hall 110 Union St. SE MN United States

ISBN: (纸本)9783952417362

This paper proposes the mixed lì synthesis for active suspension problems. With this method, a robust compensator that achieves nominal performance and meets robust stability specifications can be designed. Moreover, both the real parametric and the complex uncertainties are treated together, which usually yields a less conservative compensator than the traditional robust methods. In this paper, the design strategy is applied for active suspension, which involves real parametric uncertainties. The results are compared with the traditional LQG, complex lì and mixed lì methods. © 2001 EUCA.

关键词： Robust control

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Minimal partial realization from orthonormal basis function expansions

Minimal partial realization from orthonormal basis function ...

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IEEE Conference on Decision and control

作者： P.S.C. Heuberger T.J. de Hoog P.M.J. Van den Hof Z. Szabo J. Bokor Signals Systems and Control Group Department of Applied Physics Delft University of Technnology Delft Netherlands Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

ISBN: (纸本)0780370619

Given an expansion of a dynamical system in terms of a generalized orthonormal (Hambo) basis, the problem of realizing a state-space model of minimal McMillan degree such that its first N expansion coefficients match the given ones is addressed and solved. For the solution use is made of the properties of the Hambo operator transform theory. The resulting realization algorithms can be applied in an exact and approximative sense and can also be applied to solve a related interpolation problem.

关键词： control system synthesis Automatic control Physics automation Approximation algorithms Interpolation Transfer functions Hydrogen Finite impulse response filter Context modeling

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