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Robust stabilization of interval plants using Kronecker summation method

WSEAS Transactions on Systems 2010年第9期9卷 917-926页

作者： Matušů, Radek Prokop, Roman Matejičková, Katarína Bakošová, Monika Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlín Nad Stráněmi 4511 76005 Zlín Czech Republic Department of Information Engineering and Process Control Faculty of Chemical and Food Technology Slovak University of Technology in Bratislava Radlinského 9 81237 Bratislava Slovakia

This paper deals with design of continuous-time robustly stabilizing Proportional-Integral (PI) controllers for interval systems using the combination of Kronecker summation method, sixteen plant theorem and an algebraic approach to controller tuning. The effectiveness and practical applicability of the proposed method is demonstrated in both simulation and real experiments including control of a third order nonlinear electronic plant.

关键词： Continuous time systems

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Big Bang - Big Crunch learning method for fuzzy cognitive maps

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World Academy of Science, engineering and Technology 2010年 47卷 816-825页

作者： Yesil, Engin Urbas, Leon Institute of Automation Dresden University of Technology D-01062 Dresden Germany Faculty of Electrical and Electronics Engineering Control Engineering Department Istanbul Technical University Maslak TR-34469 Istanbul Turkey University of Technology Germany

Modeling of complex dynamic systems, which are very complicated to establish mathematical models, requires new and modern methodologies that will exploit the existing expert knowledge, human experience and historical data. Fuzzy cognitive maps are very suitable, simple, and powerful tools for simulation and analysis of these kinds of dynamic systems. However, human experts are subjective and can handle only relatively simple fuzzy cognitive maps;therefore, there is a need of developing new approaches for an automated generation of fuzzy cognitive maps using historical data. In this study, a new learning algorithm, which is called Big Bang-Big Crunch, is proposed for the first time in literature for an automated generation of fuzzy cognitive maps from data. Two real-world examples;namely a process control system and radiation therapy process, and one synthetic model are used to emphasize the effectiveness and usefulness of the proposed methodology.

关键词： Fuzzy Cognitive Maps

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Artificial neural networks broken rotor bars induction motor fault detection

Artificial neural networks broken rotor bars induction motor...

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Seminar on Neural Network Applications in Electrical engineering

作者： Dragan Matić Filip Kulić Vincente Climente-Alarcón Ruben Puche-Panadero Faculty of Technical Science Department for Automation and System Control Trg Dositeja Obradovica 6 NoviSad Serbia Faculty of Technical Science cDepartment for Automation and System Control Trg Dositeja Obradovica 6 Novi Sad Serbia Department of Electrical Engineering Comino de Vera Polytechnic University of Valencia Valencia Spain

Paper deals with application of online rotor broken bar fault detection via artificial neural networks. Fault can be detected by monitoring abnormalities of the spectrum amplitudes at certain frequencies in the motor current spectrum. These discriminative features are used for training of feed-forward backpropagation artificial neural network. Trained network is capable to successfully classify induction motor rotor condition. Results are presented in tables and figures.

关键词： Rotors Induction motors Artificial neural networks Bars Amplitude modulation Fault detection Classification algorithms

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PI controlLER DESIGN FOR TIME DELAY SYSTEMS

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IFAC Proceedings Volumes 2010年第2期43卷 349-354页

作者： M. BakoŜová K. Vaneková J. Závacká Department of Information Engineering and Process Control Institute of Information Engineering Automation and Mathematics Faculty of Chemical and Food Technology Slovak University of Technology in Bratislava Radlinského 9 812 37 Bratislava Slovak Republic fax: +421 2 52496469

The paper presents an approach to PI controller design for systems with varying time delay, which can be interpreted as systems with interval parametric uncertainty. The transfer function of the controlled system is modified by approximation of the time delay term by its Pade expansion or Taylor expansion in the numerator. PI controllers, that are able to assure robust stability of the feedback closed loop with the modified controlled system are found by the graphical method. Then the pole-placement method is used to specify those controller parameters, which assure certain quality of the control performance. Designed PI controllers are implemented using PLC SIMATIC S7-300 and tested by experiments on a laboratory electronic equipment with varying time delay.

关键词： PI controller pole-placement method robust control time-delay system

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Artificial Neural Networks Eccentricity Fault Detection of Induction Motor

Artificial Neural Networks Eccentricity Fault Detection of I...

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International Multi-Conference on Computing in the Global Information Technology, ICCGI

作者： Dragan Matić Filip Kulić Manuel Pineda-Sanchez Joan Pons-Llinares Department for Automation and System Control Faculty of Technical Science Novi Sad Serbia Department of Electrical Engineering Universidad Politécnica de Valencia Valencia Spain

This paper deals with eccentricity fault detection in a induction motor via artificial neural networks. Discriminative features are extracted from magnitude-frequency plot of line current spectra at characteristic frequencies. Based on this data, training and test sets for used artificial neural networks are made. Feedforward and radial basis function neural networks are used for tasks of rotor condition classification. Well trained artificial neural networks are capable to successfully classify rotor condition at medium and full shaft load for choosen features. Simple structure and implementation made them suitably for practical usage.

关键词： Induction motors Rotors Artificial neural networks Stators Training Helium Harmonic analysis

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Design and Realization of Low Cost Discrete PSD controller for Power Electronics Applications

Design and Realization of Low Cost Discrete PSD Controller f...

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International Conference on Computer engineering and Applications (ICCEA)

作者： Ondrej Krejcar Michal Tutsch Robert Frischer Ivo Spicka Department of Measurement and Control Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava Ostrava Czech Republic Department of Automation and Computing in Metallurgy Faculty of Metallurgy and Materials Engineering Technical University of Ostrava Ostrava Czech Republic

ISBN: (纸本)9781424460793;9780769539829

Most systems are controlling by common PID controllers. These PID controllers are available in variety possibilities. They are divided by types of controlling systems, by speed of action interference, by complexity, by robustness etc. Most of industrial controllers are very expensive and except of some basic setting they are not offering any other way, how to involve into controlling process. On the other side, developing new analog controller to control simple systems is not reasonable in financial or time issue. That's why we decided to build simple, discrete controller and implement its algorithm into single chip eight bit microcontroller (MCU). This discrete controller - PSD - is characteristic its simplicity and variability. It can control plenty of less complicated systems by a mere change of its characteristic parameters. Thanks to modern approach is possible to create a full-featured controller including power action element on an area equal to 7cm 2 .

关键词： Costs Power electronics control systems Three-term control Interference Robust control Electrical equipment industry Industrial control Process control Microcontrollers

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Continuous Noninvasive Blood Pressure Measurement by Near Infra Red CCD Camera and Pulse Transmit Time Systems

Continuous Noninvasive Blood Pressure Measurement by Near In...

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International Conference on Computer engineering and Applications (ICCEA)

作者： Petr Zurek Ondrej Krejcar Marek Penhaker Martin Cerny Robert Frischer Department of Measurement and Control Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava Ostrava Czech Republic Department of Automation and Computing in Metallurgy Faculty of Metallurgy and Materials Engineering Technical University of Ostrava Ostrava Czech Republic

ISBN: (纸本)9781424460793;9780769539829

The need of continuous blood pressure measurement is usable in wide spectrum of applications from physicians practice to home care applications. Many types of blood pressure measurement devices can be bought in electronics shops. All such devices are contact measurement devices which need to be in contact of human body (hand or foot mainly). Secondary they allow only one measurement per several minutes interval (typically ones in 10 minutes). Our goal is to develop a small device for noninvasive continuous measurement of blood pressure. This device must be a small battery powered embedded system which measure a blood pressure during a long time period and send this information remotely to operator's stations. We would like to try two systems of blood pressure monitoring. The first one is system with NIR CCD camera (Near Infra Red), which measure the wide changes of the blood vessels and the second one is system, which measure the pulse transmit time (PTT). At the end we can compare the systems and get information, which system will be a right way to obtain exact continuous blood pressure information.

关键词： Pulse measurements Blood pressure Pressure measurement Time measurement Charge coupled devices Charge-coupled image sensors Biomedical monitoring Battery charge measurement Humans Foot

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Robust PI controller design for a laboratory time delay process

Robust PI controller design for a laboratory time delay proc...

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Mediterranean Conference on control and automation (MED)

作者： Katarína Vaneková Monika Bakošová Radek Matušů Roman Prokop Jana Zavacká Faculty of Chemical and Food Technology Slovak University of Technology Bratislava Slovakia Department of Automation and Control Engineering Tomas Bata University in Zlín Zlin Czech Republic

The paper presents an approach to robust PI controller design for systems with interval parametric uncertainty and time delay. It is supposed that the controlled system is described by a transfer function with parameters lying in certain intervals and with a time delay term. The transfer function of the controlled system is modified by approximation of the time delay term by its Pade expansion. The area of all PI controller parameters k p , k i , that are able to assure the robust stability of the feedback closed loop, is found by the method, which is based on plotting the stability boundary locus in the (k p , k i )-plane. Then the pole-placement method is used to specify those controller parameters from the robust stability area, which assure quality of the control performance prescribed by a choice of closed loop poles or relative damping or natural undamped frequency of the control response. The contribution presents theoretical results confirmed by practical experiments in laboratory conditions. Robust PI controllers are found using designed approach for control of an electronic equipment with varying time delay. Designed robust PI controllers are realized using the PLC SIMATIC S7-300.

关键词： Delay effects control systems Process control Robustness Transfer functions Robust stability Polynomials

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Low-complexity polynomial approximation of explicit MPC via linear programming

Low-complexity polynomial approximation of explicit MPC via ...

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American control Conference (ACC)

作者： Michal Kvasnica Johan Löfberg Martin Herceg L'uboš C̆irka Miroslav Fikar Automation and Mathematics Slovak University of Technology in Bratislava Slovakia Institute of Information Engineering Automation and Mathematics Faculty of Chemical and Food Technology Slovak University of Technology Slovakia Automatic Control Laboratory Linköpings universitet Linköpings Sweden

This paper addresses the issue of the practical implementation of Model Predictive controllers (MPC) to processes with short sampling times. Given an explicit solution to an MPC problem, the main idea is to approximate the optimal control law defined over state space regions by a single polynomial of pre-specified degree which, when applied as a state-feedback, guarantees closed-loop stability, constraint satisfaction, and a bounded performance decay. It is shown how to search for such a polynomial by solving a single linear program.

关键词： Polynomials Linear programming Sampling methods Optimal control Stability Table lookup Automatic control Feedback State-space methods Chemical technology

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Tool support for the development of IEC 62390 compliant fieldbus profiles

Tool support for the development of IEC 62390 compliant fiel...

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International Conference on Emerging Technologies and Factory automation (ETFA)

作者： Roman Frenzel Martin Wollschlaeger Thomas Hadlich Christian Diedrich Industrial Communications Institute of Applied Computer Science Faculty of Computer Science Technical University of Dresden Dresden Germany Integrated Automation Institute for Control Systems Faculty of Electronic and Computer Science Engineering Otto-von-Guericke University of Magdeburg Germany

Industrial communication systems standardize communication protocols and services. Interoperability within automation and control systems need additional application definitions. This is usually organized with fieldbus profile specifications. Profiles become part of the overall development process of the device manufacturer. Unfortunately, today's profile descriptions are very informal and have nearly no support for the development process. This paper presents a semi-formal profile specification approach, based on IEC 62390 and using a mixed UML and MS Word process. Result of both specifications is an XML representation which can be integrated in the device development process. This method is developed for the PROFIBUS User Organisation for PROFIBUS and PROFINET device profiles.

关键词： Unified modeling language Guidelines IEC standards XML Documentation Safety Formal specifications

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