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Robust H ∞ Filter Design via Parameter-Dependent Lyapunov Functions *

IFAC Proceedings Volumes 2000年第14期33卷 65-70页

作者： Carlos E. de Souza Minyue Fu Alexandre Trofino Department of Systems and Control Laboratório Nacional de Computação Científica - LNCC Av. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil Department of Electrical and Computer Engineering The University of Newcastle NSW 2305 Australia Department of Automation and Systems Universidade Federal de Santa Catarina PO Box 476 88040-900 Florianópolis SC Brazil

This paper is concerned with the problem of H ∞ filtering for linear continuous-time systems with uncertain time-varying parameters in the matrices of the state-space signal model. The admissible values of the parameters and their rates of variation are assumed to belong to a given polyhedral region. Based on a parameter-dependent Lyapunov function, which is quadratic in the uncertain parameters, we develop an LMI method for designing a linear stationary, asymptotically stable filter, which ensures a prescribed performance in a H ∞ sense.

关键词： Robust estimation H ∞ filtering uncertain linear systems time-varying parameters parameter-dependent Lyapunov function

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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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On decentralised output feedback control of a class of composite systems with delay interconnections and uncertainties

On decentralised output feedback control of a class of compo...

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UKACC International Conference on control '98 (Conf. Publ. No. 455)

作者： G.M. Dimirovski Y.-W. Jing P. Yuan S.-J. Zhang Institute of Automation & Systems Engineering Faculty of Electrical Engineering Ss Cyril and Methodius University Skopje Macedonia Department of Automatic Control Northeastern University Shenyang Liaoning China

The stabilisation control for a class of composite plants based on the concept of output feedback is investigated. A decentralised control is constructed to stabilise this class of large-scale systems with delay and time varying uncertainties in the interconnections. The control action is based on the output feedback. Interconnections satisfy the so-called matching conditions. A sufficient condition is presented, which ensures uniform ultimate boundedness for both the subsystems and the overall system.

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Analytical design of a decentralised stabilisation control for large-scale delay interconnection systems

Analytical design of a decentralised stabilisation control f...

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UKACC International Conference on control '98 (Conf. Publ. No. 455)

作者： Y.-W. Jing S.-J. Zhang G.M. Dimirovski Department of Automatic Control Northeastern University Shenyang Liaoning China Institute of Automation & Systems Engineering Faculty of Electrical Engineering Ss Cyril and Methodius University Skopje Macedonia

The stabilisation problem of linear, time-invariant, large-scale, composite systems with delays in the interconnections without any additional assumption on system structure are considered. It is shown basically that time-delays in the interconnections do not create additional difficulties. The main results presented demonstrate that stabilisation control by the local memoryless state feedback for this class of systems is always possible.

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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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Nonlinear predictive control based on the extraction of step-response models from Takagi-Sugeno fuzzy systems

Nonlinear predictive control based on the extraction of step...

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American control Conference (ACC)

作者： M. Fischer M. Schmidt K.K. Kavsek-Biasizzo Institute of Automatic Control Laboratory of Control Systems and Process Automation Technical University of Darmstadt Darmstadt Germany Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia

This paper deals with nonlinear predictive control based on higher order Takagi-Sugeno fuzzy systems which can also be interpreted as generalized radial basis function networks. We investigate how the fuzzy models can be linked to a special type of model based predictive control algorithm, namely the dynamic matrix control (DMC). Previously, purely linear step response models were used for long-range prediction. Here, the method is extended to nonlinear processes. Therefore, various step responses for different operating points are extracted from the fuzzy model. For performance evaluation, a heat exchanger is identified by means of the local linear model tree algorithm and controlled by the modified DMC.

关键词： Predictive control Predictive models Takagi-Sugeno model Fuzzy systems Automatic control Laboratories Radial basis function networks Fuzzy control control system synthesis Nonlinear control systems

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Synthesized passive feedback control of sensor-rich structures

Synthesized passive feedback control of sensor-rich structur...

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American control Conference (ACC)

作者： P. Akella J.T. Wen Control Laboratory for Mechanical Structures (CLaMS) Center for Advanced Technology in Automation Robotics & Manufacturing Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

The passivity property of dissipative mechanical structures has long been exploited in designing passive controllers that provide robust stability even in the presence of unmodeled dynamics of the system. For an input/output map of a flexible structure to be passive, collocation of the actuators and sensors is required and also the sensors should measure the velocity of the system. The so-called smart structures frequently have more sensors than actuators. Therefore, the passive controller can at best utilize only a subset of the sensors. In this paper we consider the design of a squaring down matrix which would render a system passive subject to some additional performance considerations. The problem of obtaining the synthesized passive output is cast as a set of linear matrix inequalities (LMIs) which can be efficiently solved by the LMI Toolbox in Matlab. We apply this procedure with the assumption that the sensors provide both displacement and velocity information which is generally not true. We show that the passive controllers can be implemented without the use of velocity information. By using synthesized passive outputs in addition to naturally occurring passive outputs, we obtain better system performance. We present experimental results involving a single flexible beam with torque input and hub angular position and strain gage outputs.

关键词： Feedback control Intelligent sensors control system synthesis Mechanical sensors Sensor systems Linear matrix inequalities Mechanical factors control systems Robust stability Flexible structures

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Time-varying loads in electric power systems: Power input, equivalent circuit elements, and disturbances

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EUROPEAN TRANSACTIONS ON electrical POWER 1997年第1期7卷 5-11页

作者： Knoop, M Kohle, S [?]Michael K. F. Knoop(1965)received a Dipl.-Ing. degree in electrical engineering from Universit?t Knrlsmhe. Germany. and a Dr.-hg. degree from Universit?t der Bundeswehr Hamburg Germany. He now works with the automation department of Betriebs for schungsinstitut (BFI) mainly in the tield of modelling and control of electric xc furnaces. His interests also include dynamic systems and control theory. (Betriebsforschungsinstitut. VDEh-lnstitut fur angewandte Forschung GmbH. Postfach I05 145. D-40042 Dusseldorf Tel+491 I1/6707-385 Fax +49211/6707-3 10)

Time-varying electric loads, fluctuating around their nominal point, cause fluctuations also of current and power. The mean phasors of current and complex power differ from their nominal values, which results in a deflection of mean power input. A transformation to a time-invariant equivalent circuit is introduced representing the mean values of voltage, current and power. The variances on the other hand contribute equations for a second phenomenon of fluctuating lends: the generation of disturbances in the power supply system. Results for both phenomena are derived for single-phase lends, validated by Monte-Carlo simulations, and generalized to three important kinds of three-phase bonds. Measured data from an electric arc furnace illustrate the application of ideas.

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FPGA-based implementation of Synchronous Petri Nets

FPGA-based implementation of Synchronous Petri Nets

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International Conference on Industrial Electronics, control and Instrumentation

作者： Naehyuck Chang Wook Hyun Kwon Jaehyun Park Control Information Systems Laboratory School of Electrical Engineering Seoul National University Seoul Department of Industrial Automation Engr Inha University Ichon South Korea

ISBN: (纸本)0780327756

This paper describes a flexible and systematic implementation method of Petri Nets that can be applied to high speed parallel control. This paper suggests a hard-wired implementation for a high frequency clock-driven system with little jitter. To implement Petri Nets with synchronous (clock-driven) digital circuits, a Synchronous Petri Net is proposed. The suggested implementation method is based on a regular cell-array such as FPGA (field programmable gate array). Radix-k Petri Net and Radix-k conversion are defined to solve technology mapping problem of FPGA that consists of k-size cells. Cell usage, cell utilization, cell complexity, and speed index are defined and derived, which are used for quantitative analysis and efficient design. To help the design process, necessary CAD tools such as design entry library, hard-macro library, and net-list converter are developed. The suggested method is demonstrated using Xilinx FPGA, and its operation is verified by computer simulations.

关键词： Petri nets Field programmable gate arrays Clocks Libraries control systems Frequency Jitter Digital circuits Process design Design automation

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