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1998 IEEE International Conference on Fuzzy systems, FUZZY 1998

作者： Baranyi, Péter Aradi, Petra Kóczy, László T. Gedeon, Tamás D. Dept. of Automation T. U. of Budapest Hungary Department of Systems and Control Engineering T.U. of Budapest Hungary Dept. of Telecommunication and Telematics T. U. of Budapest Hungary School of Computer Science and Eng. U. of New South Wales Australia

ISBN: (纸本)078034863X

For very large document collections or high volume streams of documents, finding relevant documents is a major information filtering problem. A major aid to information retrieval systems produces a word frequency measure estimated from some important parts of the document using neural network approaches. In this paper a fuzzy logic technique and as its simplified case a neural network algorithm will be proposed for this task. The comparison of these two and an alternative neural network algorithm will also be discussed. © 1998 IEEE.

关键词： Information retrieval systems

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Preisach model identification of a two-wire SMA actuator

Preisach model identification of a two-wire SMA actuator

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IEEE International Conference on Robotics and Automation (ICRA)

作者： R.B. Gorbet D.W.L. Wang K.A. Morris Systems Control Group University of Toronto Toronto Canada Electrical & Computer Engineering University of Waterloo Waterloo Canada Applied Mathematics University of Waterloo Waterloo Canada

In recent years, the Preisach hysteresis model (1935) has emerged as the model of choice for the behaviour of many smart materials, such as shape memory alloys (SMA). This research treats the identification of Preisach models for a differential SMA actuator. The traditional identification technique is applied, and several models are derived for the actuator. It is seen that the classical Preisach model is able to model its behaviour. However, the results raise questions concerning the robustness of the traditional identification technique, as well as the conservative nature of current passivity-based control results for the Preisach model.

关键词： Actuators Relays Magnetic hysteresis Wire Magnetic materials Capacitive sensors Shafts Strain control Phase change materials Heating

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Sliding mode control of the X33 vehicle in launch mode

Sliding mode control of the X33 vehicle in launch mode

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American control Conference (ACC)

作者： Y. Shtessel M. Jackson C. Hall D. Krupp N.D. Hendrix Department of Electrical and Computer Engineering University of Alabama Huntsville Huntsville AL USA Guidance and Control Systems Division NASA Marshall Space Flight Center AL USA

The "nested" structure of the control system for the X33 vehicle in launch mode is developed. The outer loop (guidance) and the inner loop (rates) continuous sliding mode controllers are designed. Simulation... 详细信息

关键词： Sliding mode control Vehicles control systems Motion control Fuels Nonlinear control systems Nonlinear equations Actuators Robust control Stability

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Functional hazard analysis for highly integrated aerospace systems

Functional hazard analysis for highly integrated aerospace s...

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IEE Certification of Ground/Air systems Seminar (Ref. No. 1998/255)

作者： P.J. Wilkinson T.P. Kelly Performance and Control Systems Department Rolls-Royce Commercial Aero Engines Limited Derby UK Rolls-Royce Systems and Software Engineering Department of Computer Science University Technology Centre University of York York UK

Functional Hazard Assessment (FHA) is being increasingly recommended (e.g. by the Aerospace Recommended Practice-ARP 4754 [SAE94]) as a means of performing hazard identification. However, many of the available example applications of this approach (including that given in ARP 4761 [SAE95]) are illustrated either for aircraft-level functions or sub-system functions with obvious and visible functional effects. Our experience is that it can be difficult to apply FHA for lower level aircraft systems (specifically at the level of the engine controller) where, due to the level of complexity and integration with other systems, the overall effects of functional failure are far from obvious. In this paper, we describe the problems we have encountered when applying FHA and the (partial) solutions we have proposed in order to overcome these problems.

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Specialized neural network and fuzzy logic algorithm in comparison for word frequency prediction in document filtering

Specialized neural network and fuzzy logic algorithm in comp...

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： P. Baranyi P. Aradi L.T. Koczy T.D. Gedeon Department of Automation TU Budapest Hungary Department of Systems and Control Engineering TU Budapest Hungary Department of Telecommunication and Telematics TU Budapest Hungary School of Computer Science and Engineering University of New South Wales Australia

关键词： Intelligent networks Neural networks Fuzzy logic Frequency estimation Frequency measurement Information retrieval Information filtering Information filters Machine assisted indexing Filtering algorithms

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Simultaneous Fault Detection Of Heat Exchangers

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IFAC Proceedings Volumes 1998年第10期31卷 365-370页

作者： Gcibor Szederkényi Erik Weyer Katalin M. Hangos Dept. of Computer Science University of Veszprem H-8201 Veszprem Egyetem u. 3. Hungary Dept. of Electrical and Electronic Engineering The University of Melbourne Parkville VIC 3052 Australia Systems and Control Research Laboratory Computer and Automation Institute HAS H-1518 Budapest PO Box 63 Hungary

A grey box model-based method for fault diagnosis is proposed in this paper. The method is based on a first principle model of the process unit: a heat exchanger, and on a grey box model of the faults: the deterioration of the heat transfer surface by aging and the leaking of the outer container. The deterioration of the heat transfer surface is due to material settling, and in old heat exchangers pieces of this material can break off and cause damage in the equipment. A recursive least squares estimator with forgetting factor is used to track both the heat transfer coefficients and the cold side volume. The heat transfer coefficients are estimated both from the hot and cold side equations. The settled material breakage fault is detected via detection of abrupt positive jumps in the estimated heat transfer coefficients using a detector based on a cumulative sum (CUSUM) test. The proposed method enables simultaneous detection of the two fault types considered. Fault localization along the equipment length is also possible when temperature measurements are available along the length.

关键词： Fault detection Fault isolation Fault location Process model Grey box modelling Identification

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Specialised neural network for learning synonyms and related concepts in large document collections

Specialised neural network for learning synonyms and related...

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International Conference on Knowledge-Based Intelligent Electronic systems (KES)

作者： P. Baranyi P. Aradi L.T. Koczy T.D. Gedeon Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Hungary Department of Information Engineering University of New South Wales Sydney Australia Department of Automation Technical University of Budapest Budapest Hungary Department of Systems and Control Engineering Technical University of Budapest Budapest Hungary

For very large document collections or high volume streams of documents, finding relevant documents is a major information filtering problem. One of the main types of information retrieval systems produces a word frequency measure estimated by some important parts of the document using neural network approaches. This paper reports a new network structure for this task. It is specialised considering the main difficulties of these kinds of applications, namely, the calculation time complexity. It will be pointed out that the calculation, hence, the learning time is much reduced applying the new algorithm, however, the result is significantly improved compared to the former approaches, which offer a possibility to increase the number of considered words, hence, improve the effectiveness of information filtering systems.

关键词： Neural networks Intelligent networks Information retrieval Frequency estimation Frequency measurement Automation Australia Information filtering Machine assisted indexing computer networks

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Exponential Tracking control of a Mobile Car Using a Cascaded Approach

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IFAC Proceedings Volumes 1998年第27期31卷 201-206页

作者： Elena Panteley Erjen Lefeber Antonio Loria Henk Nijmeijer Institute of Problems of Mech. Engg. Academy of Sciences of Russia St. Petersbourg RUSSIA Faculty of Mathematical Sciences Department of Systems Signals and Control University of Twente P.O. Box 217 7500 AE Enschede The Netherlands Center for Control Engineering and Computation (CCEC) Department of Electrical and Computer Engineering University of California Santa Barbera CA 93106-9560 USA Faculty of Mechanical Engineering Eindhoven University of Technology PO Box 513 5600 MB Eindhoven The Netherlands

In this paper we address the problem of designing simple global tracking controllers for a kinematic model of a mobile robot and a simple dynamic model of a mobile robot. For this we use a cascaded systems approach, r... 详细信息

关键词： mobile robot trajectory tracking persistency of excitation global K -exponential stabilization

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Robust object tracking of robot manipulator using low-cost vision system

Robust object tracking of robot manipulator using low-cost v...

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IEEE International Conference on systems, Man and Cybernetics

作者： Wong-Gie Han Tae-Yong Kuc Agency for Defense Development Naval Weapon Systems Research and Development Center Chinhae Kyunggi South Korea Intelligent Control and Dynamic Simulation Laboratory School of Electrical and Computer Engineering Sung Kyun Kwan University Suwon Kyunggi South Korea

ISBN: (纸本)0780347781

Proposes a robust visual servoing scheme for robot manipulator with eye-in-hand camera configuration. To perform the tasks defined in the image plane, the velocity Jacobian matrix is used to transform the camera motion to the object position change. In addition, a dynamic learning controller is designed to improve the tracking performance of robotic system. The proposed control scheme is implemented for tasks of tracking moving objects and shown to outperform the conventional visual servo system without the dynamic control loop in convergence and robustness to parameter uncertainty, disturbances, low sampling rate, etc.

关键词： Robustness Robot vision systems control systems Manipulator dynamics Cameras Visual servoing Jacobian matrices Tracking loops Servomechanisms Convergence

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Numerical Modelling of control Time-Delay System

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IFAC Proceedings Volumes 1998年第13期31卷 155-159页

作者： O.B. Kwon A.V. Kim V.G. Pimenov Kyung Sung College Computer Science Dept. Shitl Prong-Ri 131 Pochun-Gun Kyung-Kido Seoul Korea Control Information Systems Laboratory School of Electrical Engineering Seoul National University Seoul 151-742 Korea Ural State University Turgenev Str. 4 Ekaterinburg 620083 Russia

Discrete-time control schemes are often used for realization of positional control strategies for continuous time control problems (Krasovskii and Subbotin, 1974; Osipov, 1971) . However for general systems with delays (whicb are often called functional differential equations (FDE)) exact solutions in both continuous and discrete schemes can be found in exceptional cases. So, as rule, it is necessary to solve corresponding control problems using suitable numerical algorithms . In surveys (Cryer and Tavernini, 1972; Hall and watt, 1976; Bellen, 1985) different numerical methods for FDE are discussed. In this paper positional implicit Runge-Kutta-like numerical methods of solving general FDE are presented. The elaborated methods are direct analogs of the corresponding numerical methods of ODE case. Also we present new theorem (which generalizes the results of (Kim and Pimenov, 1997; Kim and Pimenov, 1998)) on convergence order. The obtained results are based on distinguishing of finite dimensional and infinite dimensional components in the structure of FDE, on interpolation and extrapolation of the discrete prehistory of the model, on application of constructions of i- smooth analysis (Kim, 1996) . The notion of an approximation order for an optimal strategy in the discrete scheme of realization is introduced. The conditions, which guarantee required approximation order of the optimal strategy, are presented.

关键词： Delay positional control discretization Runge-Kutta metbod implicit systems accuracity

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