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1999 European Control Conference, ECC 1999

作者： Vukic, Z. Velagic, J. University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Unska 3 ZagrebHR-10000 Croatia University of Sarajevo Faculty of Electrical Engineering Skenderija 70 SarajevoBH-71000 Bosnia and Herzegovina

ISBN: (纸本)9783952417355

In this paper a comparative analysis of Mamdani and Sugeno type fuzzy autopilots for ships is given. Both autopilots have two inputs: the heading signal and the yaw rate signal, and only one output: command rudder angle. Input variable fuzzification, fuzzy associative memory (FAM) rules, and output set defuzzification are described. The control system for the course-keeping composed of the nonlinear ship, the steering gear servo system, fuzzy autopilot and wave disturbance is described. Both autopilots are compared in three different sailing conditions: without wave disturbance, with wave disturbance and with wave disturbance and wave filtering. The notch filter was used for filtering of second-order wave disturbances. The influence of wave disturbance on course-keeping performance was analyzed. Even though the obtained performance in simulations are very similar, authors prefer Sugeno type fuzzy autopilot, due to less strain of the steering gear servo system and faster and more accurate heading obtained. © 1999 EUCA.

关键词： Ships

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Friction compensation methods in position and speed control systems

Friction compensation methods in position and speed control ...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： D. Stajic N. Peric J. Deur Faculty of Electrical Engineering and Computing Department or Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

Friction appears in the bearings and reduction gear of controlled electrical drives and affects the quality of the position, speed or force control. The servosystem performance can be improved by implementation of acceleration feedback. For the reason that acceleration measurement is often either not possible or practical, the implementation of acceleration estimation by an observer or differentiation of speed is proposed. Another approach to friction influence compensation is based on the disturbance observer. Its advantage is that it can be applied generally to the estimation of various disturbances. This paper deals with these friction compensation methods which are not based on friction model, but on the compensation of friction as a disturbance. The efficiency of these methods in a servodrive with Stribeck friction is compared by computer simulation and experimentally on a servosystem laboratory model.

关键词： Friction Velocity control Force control Servosystems Acceleration Accelerometers Gears Feedback Computer simulation Laboratories

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Automatic contingency selection based on a pattern analysis approach

Automatic contingency selection based on a pattern analysis ...

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International Conference on Electric Power engineering, PowerTech Budapest

作者： M.S. Rodrigues J.C.S. Souza M.B. Do Coutto Filho M.Th. Schilling Applied Computing & Automation Department of Electrical Engineering Fluminense Federal University (UFF) Brazil

Summary form only given. This paper presents a method for power systems automatic contingency selection and static security evaluation. It is possible to identify potentially harmful contingencies in a very short computational time, being the risk of false alarms and contingency misses. The method is tested for many different operating conditions and simulated with the IEEE 24 bus test system. Classification rates for contingency selection and static security evaluation are also provided.

关键词： Pattern analysis Power system security Power system analysis computing Power system simulation Power system modeling Computational modeling Artificial neural networks Power system planning Power engineering and energy Systems engineering and theory

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Frequency domain analysis of B-spline interpolation

Frequency domain analysis of B-spline interpolation

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Z. Mihajlovic A. Goluban M. Zagar Department of Electronics Microelectronics Computer and Intelligent Systems Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper describes B-spline interpolation and compares it with other reconstruction methods, especially in three-dimensional space. We first consider the B-spline bases in the terms of convolution in signal processing. The presented analysis requires careful usage of continuous and discrete representation of B-spline. Emphasis is given to the important difference between B-spline interpolation and approximation. The difference is shown through frequency domain analysis, so we derive frequency responses of the B-spline interpolation and approximation. We conclude by demonstrating the use of several reconstruction filters and appropriate gradient estimators in volume rendering. Exact reconstruction in volume visualization is very important in many industrial applications, such as material cavity control.

关键词： Frequency domain analysis Spline Interpolation Image reconstruction Convolution Filters Polynomials Data visualization Frequency response Microelectronics

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The B-spline interpolation in visualization

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Journal of computing and Information Technology 1999年第3期7卷 245-253页

作者： Mihajlović, Željka Goluban, Alan Department of Electronics Microelectronics Computer and intelligent Systems Faculty of Electrical Engineering arid Computing University of Zagreb Unska 3 Zagreb10 000 Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Unska 3 Zagreb10 000 Croatia

The volume data is generally in the form of the large array of numbers. In order to render the object hidden in the volumetric data, we need to reconstruct or interpolate data values between the samples. The novelty presented in this paper is B-spline interpolation in the volumetric space. We show that this approach is better than currently used methods. We also present a hybrid approach, analyze this approach in frequency domain and compare it to B-spline interpolation. To enhance the quality during the volume visualization process it is important to enhance the quality of the reconstruction. It is of crucial importance to explore different undesired effects. If better reconstruction is performed the more accurate result of volume visualization process is achieved.

关键词： Volume rendering

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A Nonlinear Wave Metric and its CNN Implementation for Object Classification

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Journal of VLSI signal processing systems for signal, image and video technology 1999年第2期23卷 437-447页

作者： Szatmári, István Rekeczky, Csaba Roska, Tamás Analogical and Neural Computing Laboratory Computer and Automation Institute Hungarian Academy of Sciences Budapest Hungary Electronics Research Laboratory College of Engineering University of California at Berkeley Berkeley USA

In this paper a nonlinear wave metric is introduced for object classification. It is shown that the choice of a metric is a nontrivial problem since it is easy to give examples when well-known distance measures, such as Hamming, Hausdorff, and Nonlinear Hausdorff metrics are completely inadequate for this classification. As an alternative a generalized theorem is proposed that includes the previous metrics as special cases. It is based on nonlinear wave propagation and defines a computational framework that is well-suited for parallel array processors. In this study we investigate different Cellular Neural Network (CNN) architectures and solutions for the proposed metric and analyze its VLSI implementation complexity.

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CNN Algorithms for Video Authentication and Copyright Protection

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Journal of VLSI signal processing systems for signal, image and video technology 1999年第2期23卷 449-463页

作者： Csapodi, Márton Vandewalle, Joos Preneel, Bart Analogic and Neural Computing Systems Laboratory Computer and Automation Institute Hungarian Academy of Sciences Budapest Hungary ESAT SISTA/COSIC Laboratory Department of Electrical Engineering Katholieke Universiteit Leuven Leuven Belgium

This paper is concerned with the implementation of an image comparison algorithm and cryptographic hash functions on the regular array of cellular neural network (CNN) cells. These operations are necessary for message authentication and copyright protection in the multimedia service environment, serving both the interest of the copyright owner and the user. The basic problems of multimedia protection along with the requirements and role of the different actors in a multimedia service environment are also described here.

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Fundamental problems in fault detection and identification

Fundamental problems in fault detection and identification

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IEEE Conference on Decision and Control

作者： A. Saberi P. Sannuti A.A. Stoorvogel H. Niemann School of Electrical Engineering Washington State University Pullman WA USA Department of Math. and Computing Science Eindhovan University of Technology Eindhoven Netherlands Department of Elec. and Computer Engineering Rutgers University Piscataway NJ USA Department of Automation Technical University of Denmark Lyngby Denmark

For certain fundamental problems in fault detection and identification, the necessary and sufficient conditions for their solvability are derived. These conditions are weaker than the ones found in the literature sinc... 详细信息

关键词： Fault detection Fault diagnosis Electrical fault detection State-space methods Sufficient conditions Face detection Signal design Signal generators Signal processing automation

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New matrix formulation for supervisory controller design in practical flexible manufacturing system

New matrix formulation for supervisory controller design in ...

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IEEE International Symposium on Intelligent Control (ISIC)

作者： S. Bogdan F.L. Lewis Z. Kovacic A. Gurel M. Stajdohar Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Automation and Robotics Research Institute University of Texas Arlington Fort Worth TX USA Department Electrical and Electronics Engineering Eastern Mediterranean University Famagusta Turkey D.P. Elektra Sisak HEP Sisak Croatia

The paper deals with a new matrix formulation of a supervisory controller design in practical flexible manufacturing system (FMS). Design method is applied to the laboratory setup of a finite-buffer multiple re-entrant flow line FMS. Control of the FMS is based on a matrix model approach which significantly reduces the computational effort. The results obtained during experiments have confirmed that effectiveness of matrix-based FMS control in terms of deadlock-free operation is a fully feasible goal.

关键词： Flexible manufacturing systems Automatic control System recovery Dispatching Robotics and automation Manufacturing automation Laboratories Controllability Observability Testing

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Exact, almost and delayed fault detection-an observer based approach

Exact, almost and delayed fault detection-an observer based ...

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American Control Conference (ACC)

作者： H. Niemann A. Saberi A.A. Stoorvogel P. Sannuti Department of Automation Technical University of Denmark Lyngby Denmark School of Electrical Engineering Washington State University Pullman WA USA Department of Math. and Computing Science Eindhovan University of Technology Eindhoven Netherlands Department of Elec. and Computer Engineering Rutgers University Piscataway NJ USA

Considers the problem of fault detection and isolation while using zero or almost zero threshold. A number of different fault detection and isolation problems using exact or almost exact disturbance decoupling are formulated. Solvability conditions are given for the formulated design problems. The l-step delayed fault detection problem is also considered for discrete-time systems.

关键词： Delay Fault detection Electrical fault detection automation Isolation technology Control theory Hydrogen Optimal control State estimation Observers

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