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

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

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.

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

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.

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

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Renewable energy and sustainable development in Hungary

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International Journal of Sustainable Development 2002年第1-2期5卷 204-223页

作者： Molnár, Sándor Tajthy, Tihamér Takács, Tibor Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary Budapest University of Technology Budapest Hungary Systemexpert Consulting Ltd. Matyashegyi u7/b H-1037 Budapest Hungary

This paper presents an overview of the use of renewable energy in Hungary. It analyses the role of renewables in the sustainable development of the country and in the reduction of greenhouse gas emissions. Although Hungary is rich in geothermal sources, the use of renewable energy sources is not economically viable in the country compared with traditional energy sources. In Hungary only biomass can currently be considered as a significant source of renewable energy. The potential for carbon dioxide and methane emissions reduction is estimated in the case of renewable energy penetration. Copyright © 2002 Inderscience Enterprises Ltd.

关键词： Renewable energy resources

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An accelerated digital CNN-UM (CASTLE) architecture by using the pipe-line technique

An accelerated digital CNN-UM (CASTLE) architecture by using...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： T. Hidvegi P. Keresztes P. Solgay Analogic and Neural Computing Systems Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Analogic and Neural Computing Systems Laboratory Hungarian Academy of Sciences Budapest Hungary István Széchenyi University Gyôr Hungary

Different CNN-UM architecture implementations, analog and emulated digital, were developed. The emulated digital architecture (CASTLE) is accurate but slower than the analog CNN-UMs. It is generally disadvantageous especially if transient computing is critical. The operation speed of the emulated digital implementations, namely CASTLE, can be increased significantly using the pipeline technique. This solution is analyzed with respect to area, time, etc. These arithmetic cores were tested and simulated using a VIRTEX FPGA development system.

关键词： Acceleration computer architecture Cellular neural networks Arithmetic Registers automation Image processing System testing Computational modeling Field programmable gate arrays

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Nonlinear modelling and model verification of a single protection valve

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Periodica Polytechnica Transportation Engineering 2002年第1-2期30卷 69-92页

作者： Németh, Huba Ailer, Piroska Hangos, Katalin M. Knorr-Bremse Res./Development Centre Major u. 69 H-1119 Budapest Hungary Aviation Technical Institute Miklos Zrinyi Natl. Def. Univ. P.O.B. 1 H-5008 Szolnok Hungary Systems and Control Laboratory Comp./Automation Research Institute Hungarian Academy of Sciences P.O.B. 63 H-1518 Budapest Hungary

A lumped parameter dynamic model of a single protection valve with electronic actuation in a brake system based on first engineering principles is presented in this paper for control design purposes. The model is developed in an index-1 differential-algebraic equation (DAE) form, and it is capable of describing the hybrid behaviour of the protection valve. The DAE model is transformed into its standard nonlinear input-affine state-space model form, which will be used for control design purposes. The developed model has been verified by simulation studies, where it is shown that it is capable to describe the dynamic behavior of the examined protection valve.

关键词： Valves (mechanical)

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Intelligent assumption retrieval from process models by model-based reasoning 1

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14th International Conference on Industrial and Engineering Applications of Artificial Intelligence and Expert systems, IEA/AIE 2001

作者： Lakner, R. Hangos, K.M. Dept. of Computer Science University of Veszprém Veszprém Hungary Systems and Control Laboratory Computer and Automation Research Institute HAS Budapest Hungary

ISBN: (数字)9783540455172

ISBN: (纸本)3540422196

Process models can be seen as structured knowledge base elements with syntax and semantics dictated by the underlying physical and chemical laws. The effect of model simplification assumptions is then determined by forward reasoning in order to take into account all of their implications. A bidirectional reasoning method for the retrieval of modelling assumptions from two related process models is proposed. An intelligent model editor is constructed to perform and test the model-based reasoning methods related to the assumption retrieval. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Semantics

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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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High speed stand-alone visual decision maker device based on focal plane analogic processor array chip

High speed stand-alone visual decision maker device based on...

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IEEE International Workshop on Virtual and Intelligent Measurement systems

作者： L. Torok A. Zarandy T. Roska Analogical & Neural Computing Systems Laboratory at Computer and Automation Research Institute of the Hungarian Academy of Sciences Budapest Hungary

ISBN: (纸本)0780365682

Newly emerging problems require high speed decision making based on visual perception of the environment. A project was set up to construct an intelligent agent like self-contained device that is capable to act in real-time and show collaborative behavior. Giving the hardware basis for decisions to be made a cellular nonlinear network CNN (Chua and Yang, 1988) chip implementation's optical input is used in combination with the cooperative devices' information that is received via binary ports and serial ports. The proposed design is a self-contained compact device that is prepared to operate stand-alone for up to 10 hours running on medium sized batteries while doing measurements, logging and collaborating with its environment via parallel port (for image transfer), RS-232 port (using modbus, profibus, PPP protocols) and binary I/O-s. Intelligent power module, optical isolation, watch dog capability is also considered.

关键词： Collaboration High speed optical techniques Nonlinear optics Decision making Visual perception Intelligent agent Hardware Cellular networks Cellular neural networks Nonlinear optical devices

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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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Taxonomy of problem management activities

Taxonomy of problem management activities

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(CSMR) European Conference on Software Maintenance and Reengineering

作者： M. Kajko-Mattsson U. Westblom S. Forssander G. Andersson M. Medin S. Ebarasi T. Fahlgren S.-E. Johansson S. Tornquist M. Holmgren Software Maintenance Laboratory Department of Computer and Systems Sciences Stockholm University and Royal Institute of Technology Kista Sweden Research AB ABB Automation Products AB and ABB Robotics AB Software Maintenance Laboratory ABB Corporate Vasteras Sweden

ISBN: (纸本)0769510280

Maintenance categories differ too much in order to be covered by one and the same generic process model. Too general process models do not give enough guidance when building process models and when measuring processes. They often invite subjectivity and imprecision. The authors suggest a detailed taxonomy of the activities for one of the processes essential within corrective maintenance: Problem Management Process. Together with other taxonomies of the processes inherent within corrective maintenance, this taxonomy should constitute a platform for defining corrective maintenance process models and an interim reference model for future measurements of corrective software maintenance.

关键词： Taxonomy Software maintenance Costs Capability maturity model Robotics and automation Laboratories Software measurement Software standards Preventive maintenance computer industry

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