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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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LPV-modeling of a low-power gas turbine

LPV-modeling of a low-power gas turbine

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8th Mini Conference on Vehicle System Dynamics, Identification and Anomalies, VSDIA 2002

作者： Ailer, Piroska Szederkényi, Gábor Hangos, Katalin M. Aviation Technical Institute Miklós Zrínyi National Defence University POB. 1 H-5008 Szolnok Hungary Systems and Control Laboratory Computer and Automation Research Institute HAS POB. 63 H-1518 Budapest Hungary

The nonlinear dynamic model of gas turbines is derived from first engineering principles, which consists of differential conservation balances completed by algebraic constitutive relations. This nonlinear dynamic model can then be transformed into input-affine form. The coordinate-functions of the state equation f(x) have very complicated algebraic structures, while the functions gi,(x) are constants. Because of this fact, the nonlinear dynamic analysis of the model, such as investigation of controllability and stability, can only be performed with difficulty or in some cases it can not be done. To solve this problem and to investigate the controllability and stability of the model in a more effective way the nonlinear dynamic model has to be transformed into LPV (Linear Parameter-Varying) model. This LPV-model can then be effectively used to develop some types of controllers to improve the dynamic response of the engine. In this paper we show the possible ways and steps of the transformation being neither obvious nor unique and the final form of the LPV-model of a pilot-plant gas turbine, which is installed in the Budapest University of Technology and Economics. Department of Aircraft and Ships on a test stand.

关键词： Gas turbines

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A real-time Java system on a multithreaded Java microcontroller

A real-time Java system on a multithreaded Java microcontrol...

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International Symposium on Object-Oriented Real-Time Distributed Computing

作者： M. Pfeffer S. Uhrig T. Ungerer U. Brinkschulte Institute for Computer Science University of Augsburg Augsburg Germany Institute for Process Control Automation and Robotics University of Karlsruhe Karlsruhe Germany

This paper presents a real-time Java hardware and software system for use in embedded applications. The system includes a multithreaded Java microcontroller, an adapted Java Virtual Machine (JVH) and an extended application programming interface (API). The microcontroller core is designed with a multithreaded pipeline and hardware support for real-time scheduling algorithms. The Java Virtual Machine consists of trap routines for complex Java byte-codes, real-time garbage collection and a class loader for creating real-time data structures. On a higher level, the application programming interface provides easy real-time thread management and access to hardware components like serial interfaces and timer/counter units.

关键词： Java Real time systems Microcontrollers Hardware Application software Virtual machining Software systems Algorithm design and analysis Pipelines Scheduling algorithm

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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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Comprehensive analysis of greenhouse gas emissions in Hungary

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International Journal of Sustainable Development 2002年第1-2期5卷 195-203页

作者： Molnár, S. Molnár, M. Takács, T. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary Systemexpert Consulting Ltd. Matyashegyi u7/b H-1037 Budapest Hungary

This paper overviews the anthropogenic greenhouse gas emissions in Hungary in the period 1985-95. The emissions have been determined and reported according to the IPCC methodologies. The emissions of greenhouse gases decreased until 1994, basically as a result of the economic recession. Hungary has chosen the yearly average emission level of 1985-87 as the base level. In 1994, greenhouse gas emissions were under this level by 30%. Considering this, and the ongoing governmental energy efficiency programmes, Hungary will be able to meet the undertaken emission levels of the UN Framework Convention of Climate Change. Copyright © 2002 Inderscience Enterprises Ltd.

关键词： Greenhouse effect

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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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Design of FDI filter for an aircraft control system

Design of FDI filter for an aircraft control system

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American control Conference (ACC)

作者： I. Szaszi B. Kulcsar G.J. Balas J. Bokor Department of Control and Transport Automation Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of AeroSpace Engineering and Mechanics University of Minnesota Minneapolis USA Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

This paper presents a fault detection and isolation (FDI) filter design to linearize longitudinal dynamics of a Boeing 747 series 100/200. The FDI filter design is based on a geometric approach which relies on the use of (C,A) invariant subspaces and provides conditions on separability and mutual detectability of the failures. In our case the fault detection filter is sensitive to elevator faults and pitch rate sensor faults. Typically, the FDI filter design approach is elaborated for an open loop model and applied in the closed loop. The robustness aspect of FDI is considered and the effect of closing the loop is shown in the nominal case as well as in the uncertain case. The FDI filter designed for aircraft control systems is analyzed for a nominal closed loop system in the presence of sensor noise.

关键词： Fault detection Filters Aerospace control Aircraft Air traffic control Design automation control systems Sensor systems control system synthesis Air safety

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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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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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On complex non-linear systems with symmetries: controllability preserving decomposition

On complex non-linear systems with symmetries: controllabili...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： G.M. Dimirovski Y.-W. Jing J. Zhao T.D. Kolemisevska-Gugulovska Institute of Automation & Systems Engineering Faculty of Electrical Engineering Ss Cyril and Methodius University Skopje Macedonia Department of Computer Engineering Faculty of Engineering Dogus University Istanbul Turkey Institute of Control Science School of Information Science & Engineering Northeastern University Shenyang Liaoning China Institute of Automation & Systems Engineering Faculty of Electrical Engineering Ss Cyril and Methodius University Skopje Macedonia

In this paper, the problems of isomorphic decomposition and controllability of a class of nonlinear systems possessing symmetries, on the basis of quotient systems, is studied. The isomorphic decomposition formations of these systems are derived. Finally, it is shown that controllability of the original systems can be determined by that of the subsystems, which are obtained through isomorphic decomposition. The corresponding sufficient and necessary conditions are given. Two new theoretical results have been proved.

关键词： controllability Nonlinear control systems control systems Nonlinear systems Automatic control Information science automation Systems engineering and theory Feedback Mathematical model

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