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A25: Measurement of pressures in silos using strain gages

IFAC Proceedings Volumes 2004年第20期37卷 141-146页

作者： Lukáš Martinák Aleš Oujezdský Aleš Slíva Department of Measurement and Control Faculty of Electrical Engineering and Computer Science 17. listopadu 15 708 33 Ostrava-Poruba Czech Republic Institute of Transportation Faculty of Mechanical Engineering VŠB–Technical University of Ostrava 17. listopadu 15 708 33 Ostrava-Poruba Czech Republic

The paper deals with a bulk solid pressure observation inside a silo using new developed 3Dimensional (Triaxial) Indicator. New design and conception of the 3D indicator have been developed exclusively for detecting of real stresses/pressures inside vessels, bunkers and silos. The unique design of the 3D indicator in cooperation with appropriate used software, and with a silo model is able to assure a clear image to pressure/stress identifications in particulate solid. Moreover, the third dimension is unique and enriches the area of the pressure knowledge. The measurement process incl. the procedure of processing values using the created interactive software environment has been explained in the poster intimately and investigated in a real silo loaded by a poured bulk solid. Real results and outputs of the investigation have been presented and discovered in the paper.

关键词： stress pressure silo 3D indicator strain gage

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Synchronization of chaotic systems via hybrid impulsive and switching control

Synchronization of chaotic systems via hybrid impulsive and ...

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Asian control Conference

作者： Zhi-Hong Guan D.J. Hill Xuemin Shen Xinghuo Yu Department Control Science & Engineering Huazhong University of Science and Technology Wuhan China Department Electronic Engineering City University of Hong Kong Hong Kong China Department Electrical & Computer Engineering University of Waterloo ONT Canada Faculty of Engineering Royal Melbourne Institute of Technology Melbourne VIC Australia

In this paper, a new hybrid impulsive and switching control strategy for chaos synchronization is developed. Using switched Lyapunov functions, several new criteria for exponential stability and asymptotical stability of hybrid impulsive and switching nonlinear systems are established and, particularly, some simple sufficient conditions for driving the synchronization error to zero are proposed. A typical example, the Chua's chaotic circuit, is given for illustrating and visualizing the theoretical results.

关键词： Chaos control systems Chaotic communication Circuit stability Stability criteria Asymptotic stability Nonlinear systems Visualization Cities and towns Lyapunov method

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Parameters optimization of fuzzy-neural dynamic model

Parameters optimization of fuzzy-neural dynamic model

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Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： P. Cermak P. Chmiel Institute of Computer Science Silesian University in Opava Opava Czech Republic Department of Measurement and Control Faculty of Electrical Engineering and Computer Science VšB Technical University of Ostrava Ostrava Czech Republic

In this paper we proposed a fuzzy neural network model which can embody a fuzzy Takagi-Sugeno model and carry out fuzzy inference and support structure of fuzzy rules. The algorithm of model properties improvement consists of new origin procedures namely input space partition, fuzzy terms number and rule number extending, low-effective fuzzy terms and rules extraction and consequent structure identification. In the proposed fuzzy modeling method we first design a rough initial fuzzy model with complete partition of input variable space (or initial partition based on expert knowledge). Then a fuzzy neural network is constructed based on rough fuzzy model. By learning of the neural network we can tune of embedded initial fuzzy model. Next, the additional identifying procedure is introduced based on additional partition of fuzzy input space to improve the properties of initial fuzzy model and to decrease the model error. In final part of identification some low-effective terms and rules are extracted and final rule based model is formed. To apply the new identifying procedures and to introduce possibilities of variability of their properties some parameters have to be put in. The strategy of such parameter optimization is provided by new advanced genetic algorithm. Criterion and cost function has been selected as global fuzzy-neuro model error. To show the applicability of new method and to make a possibility to real systems modeling, we designed the fuzzy-neural network programme tool FUZNET. There were two case studies performed: the first case study presents the prediction of Mackey-Glass time series with using fuzzy-neural regression model (FNRM) predictor; the second case study presents task of a coke-oven gas cooler modeling.

关键词： Fuzzy neural networks Predictive models Takagi-Sugeno model Partitioning algorithms Inference algorithms Design methodology Input variables Neural networks Genetic algorithms Cost function

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Stability of linear time invariant systems with interval fractional orders and interval coefficients

Stability of linear time invariant systems with interval fra...

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International Conference on Computational Cybernetics (ICCC)

作者： I. Petras YangQuan Chen B.M. Vinagre I. Podlubny Department of Informatics and Process Control BERG Faculty Technical University of Kosice Kosice Slovakia Center for Self-Organizing and Intelligent System (CSOIS) Department of Electrical and Computer Engineering Utah State University UT USA Department of Electronic and Electromechanical Engineering Industrial Engineering School University of Extremadura Badajoz Spain

This paper considers the stability of the fractional-order linear time-invariant systems with interval type uncertainties in both fractional orders and the relevant coefficients. It is an extension of our previous result on the robust stability analysis of the interval type uncertain fractional order LTI systems with crisply known fractional orders. We have proposed a stability check procedure for uncertain LTI systems with interval fractional orders and interval coefficients. The procedure is demonstrated with some simple examples

关键词： Time invariant systems Robust stability Stability analysis System testing Differential equations Polynomials Informatics Proportional control Uncertainty Robustness

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Improved Operation of Pusher Reheating Furnaces by Using a Supervisory-Plus-Regulatory control

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IFAC Proceedings Volumes 2004年第5期37卷 209-214页

作者： Zh.A. Icev M.J. Stankovski T.D. Kolemishevska-Gugulovskal J. Zhao G.M. Dimirovski SS Cyril and Methodius University. Faculty of Electrical Engineering ASE Institute P.O.B. 574 MK-JOOO Skopje Republic of Macedonia Northeastern University. School of Information Science and Engineering Institute of Control Theory Shenyang Liaoning 110004 P.R. of China Dogus University Faculty of Engineering Computer Engineering Department Acibadem Zeamet Sk. 21 Kadikoy TR-34722 Istanbul Republic of Turkey

A systems engineering approach to integrated control and supervision for applications to industrial multi-zone furnaces has been elaborated and tested in a case study of three-zone 25 MW RZS pusher furnace at Skopje Steelworks. The integrated control and supervision design is based on combined use of general predictive control optimization of set-points, at the upper level, and steady-state decoupling classical two-term laws, at the lower executive control level. For practical engineering and maintenance reasons, digital implementations are sought within standard computer process control platform.

关键词： Generalized predictive control integrated control and supervision optimization time-delay processes set-point control

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Optimizing Supervision and control for Industrial Furnaces: Predictive control Based Design

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IFAC Proceedings Volumes 2004年第19期37卷 17-28页

作者： Georgi M. Dimirovski A. Talha Dinibütün Miomir K. Vukobratovic J. Zhao SS Cyril and Methodius University Faculty of Electrical Engineering MK-1000 Skopje Republic of Macedonia Dogus University Computer Engineering Department Faculty of Engineering Acibadem Zeamet Sk. 21 Kadikoy TR-34722 Istanbul Turkey Institute “Mihailo Pupin” Centre of Robotics and Flexible Automation 11000 Belgrade Serbia and Montenegro Northeastern University School of Information Science and Engineering Institute of Control Theory Shenyang Liaoning 110004 P.R. of China

A systems re-engineering technique to integrated control and supervision for applications to industrial multi-zone furnaces has been elaborated by using known theories on generalized predictive control and nonlinear programming. This paper presents the derivation of optimizing equations and inequalities. The design is based on the use of general predictive control to provide optimized set-points under the presumption a well designed regulatory control was implemented at the executive level. Digital implementation of control functions are sought within standard computer process control platform for practical engineering and maintenance reasons.

关键词： Complex time-delay processes generalized predictive control integrated control and supervision optimization set-point control

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Tool for remote control of mobile robots with visualization by means of virtual reality 7

Tool for remote control of mobile robots with visualization ...

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7th International Conference on Telecommunications, ConTEL 2003

作者： Brščić, Dražen University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Unska 3 ZagrebHR-10000 Croatia

ISBN: (纸本)9531840520

This paper presents the current work on the development of a tool for remote control of mobile robots. The tool consists of a local controller on the robot side and a user interface for simulation and remote control that connects with the robot through the network. The user interface is implemented as an HTML page with a Java applet for remote control and communication and a virtual environment written in VRML for visualization. This way users have the ability to connect to a dedicated WWW server and download the user interface. This paper describes the concept of the tool design and the developed user interface. © 2003, Institute of electrical and Electronics Engineers Inc. All rights reserved.

关键词： Visualization

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Reconfigurable control for ship steering

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Proceedings of the Institution of Mechanical Engineers Part M: Journal of engineering for the Maritime Environment 2003年第1期217卷 25-29页

作者： Omerdic, E. Roberts, G.N. Vukic, Z. Mechatronics Research Centre University of Allt-yr-yn Campus PO Box 180 New-portNP20 5XR United States Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

This paper is concerned with the application of a heuristic approach in the design of a fault-tolerant control system for ship steering. It proposes an advanced reconfigurable control system (RCS) for ship course changing/keeping and track keeping, robust to faults in actuator, gyrocompass and global positioning system (GPS) in the presence of disturbances (waves and currents). The proposed control scheme uses a reference model for compensation of signals from fault sensors and a compensator for reducing the loss of the control performance produced by a fault in the steering machine. In the case of the occurrence of the fault in one or more components, this control system minimizes loss in the control performance and gives enough time for operators to take appropriate action in order to reduce the risk of safety hazards and avoid severe consequences of the fault. The unavoidable penalty of degradation in control performance was found to be acceptable. © 2003 Institution of Mechanical Engineers.

关键词： Linear control systems

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Robust regulation of a class of nonlinear systems using singular perturbation approach

Robust regulation of a class of nonlinear systems using sing...

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2003 European control Conference, ECC 2003

作者： Amjadifard, R. Yazdanpanah, M.J. Beheshti, M.T.H. Department of Electrical Engineering Faculty of Engineering Tarbiat Modarres University Tehran Iran Department of Electrical and Computer Engineering Control and Intelligent Processing Center of Excellence University of Tehran Tehran Iran

ISBN: (纸本)9783952417379

In this paper, we consider robust regulation of a class of nonlinear systems, via H∞ controller using singular perturbation approach. First, using normal form equations, we eliminate the nonlinear part of the system matrix of equations of system and transform it to a linear diagonal form. Separating new equations to slow and fast subsystems, due to the singular perturbation approach and with the assumption of norm-boundedness of the fast dynamics, we can treat them as disturbance and design H∞ controller for a system with a lower order than the original one that stabilizes the overall closed loop system. The proposed method is applied to a single link, flexible joint robot manipulator. © 2003 EUCA.

关键词： Robust control

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Technological control system in Linux 6

Technological control system in Linux

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6th IFAC Workshop on Programmable Devices and Systems, PDS 2003

作者： Slanina, Zdenek Srovnal, Vilem VSB - Technical University of Ostrava Faculty of Electrical Engineering and Computer Science Department of Measurement and Control Czech Republic

This article deals with using operating system Linux, for solution of problems on the field of technological control and measurement. Linux is developed by student Linus Torvalds in cooperation with programmers in the world by other operating system UNIX. Thanks to powerful tools for programmers and further convenient properties is Linux good to use in automatic control problems. Copyright © 2003 IFAC.

关键词： Programmable logic controllers

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