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2009 10th European control Conference, ECC 2009

作者： Dragomir, Otilia Elena Gouriveau, Rafael Dragomir, Florin Minca, Eugenia Zerhouni, Noureddine Valahia University of Târgoviste Electrical Engineering Faculty Automation and Information Department Unirii Avenue 18-20 Târgoviste Romania FEMTO-ST Institute CNRS - UFC Automatic Control and Micro-Mechatronic Systems Department 24 rue Alain Savary Besançon25000 France

ISBN: (纸本)9783952417393

Prognostic is nowadays recognized as a key feature in maintenance strategies as it should allow avoiding inopportune maintenance spending. Real prognostic systems are however scarce in industry. That can be explained from different aspects, on of them being the difficulty of choosing an efficient technology: many approaches to support the prognostic process exist, whose applicability is highly dependent on industrial constraints. Thus, the general purpose of the paper is to explore the way of performing failure prognostics so that manager can act consequently. Different aspects of prognostic are discussed. The prognostic process is (re)defined and an overview of prognostic metrics is given. Following that, the 'prognostic approaches' are described. The whole aims at giving an overview of the prognostic area, both from the academic and industrial points of views. © 2009 EUCA.

关键词： Condition based maintenance

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SMES MRI device - Alternative for ecological energy storage

SMES MRI device - Alternative for ecological energy storage

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作者： Molokac, S. Grega, L. Rybar, P. Rybarova, M. Technical University of Košice Faculty of Mining Ecology Process Control and Geotechnology Park Komenskeho 19 SK - 040 00 Kosice Slovakia Technical University of Košice Faculty of Electrical Engineering and Informatics Letna 9 SK-040 00 Kosice Slovakia

ISBN: (纸本)9781439817841

It is well known, that the electrical energy storage in the large scale is basically difficult process. Such a process is marked by the energy losses, as the conversion of electrical energy into another form is most frequently. Though, the superconducting magnetic energy storage (SMES) technology offers the energy storage in an unchanged form, which is advantageous primarily in the achieved efficiency. The magnetic resonance imaging (MRI) devices, commonly used in the medical facilities, there is possibility of using such ecological devices for energy storage purposes, after its rejection from operation. The paper gives a short review of current UPS and energy storage technologies, SMES applications and short section about a research project running at the faculty of Mining, Ecology, Process control and Geotechnologies at Technical University in Kǒice, Slovakia, which deals with using rejected MRI for electrical energy storage and backup power supply purposes.

关键词： Magnetic resonance imaging

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The lagrange interpolation formula for analyzing fluid movement in network profiles

The lagrange interpolation formula for analyzing fluid movem...

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10th International Symposium of Hungarian Researchers on Computational Intelligence and informatics, CINTI 2009

作者： Kovács, Adalbert Kovács, Levente Dept. of Mathematics University Politehnica of Timisoara P-ta Victoriei Nr. 2 RO-300006 Timişoara Romania Dept. of Control Engineering and Information Technology Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Magyar tudósok krt. 2 H-1117 Budapest Hungary

The paper presents two calculus algorithms for the study of the compressible fluid's stationary movement through profile grids on an axial-symmetric flow-surface. The first method is based on an iterative formula developed by the authors to calculate the complex conjugate velocity (using the CVBEM algorithm). The second method solves the fundamental integral equation in real values by a priori building up the velocity potential's integral equation (BEM method). In this case it is presented the necessity of using the Lagrangian interpolation formula through five points for the calculation of the derivatives of the velocity potential. In both cases the consecutive approximations can be organized simultaneously or successive with respect to parameters ς (fluid's density) and h (thickness variation of fluid stratum).

关键词： Integral equations

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Past and present of automatic glucose-insulin control research at BME

Past and present of automatic glucose-insulin control resear...

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10th International Symposium of Hungarian Researchers on Computational Intelligence and informatics, CINTI 2009

作者： Kovács, Levente Benyó, Balázs Benyó, Zoltán Kovács, Adalbert Department of Control Engineering and Information Technology Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Magyar Tudósok krt. 2 H-1117 Budapest Hungary Dept. of Mathematics University Politehnica of Timisoara P-ta Victoriei Nr. 2 RO-300006 Timişoara Romania

The paper reviews the research results in the field of automatic control of Type I diabetes mellitus obtained by the Biomedical engineering laboratory of the control engineering and Inforamtion Technology Department, Budapest University of Technology and Economics (BME) in the last years. Beside the past, the present and the future ideas are also numbered.

关键词： Biomedical engineering

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Empirical analysis of the effect of parasitics and of reverse recovery as an amplitude error on distortion in a class D audio amplifier

Empirical analysis of the effect of parasitics and of revers...

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AFRICON Conference

作者： F. Koeslag H. du T. Mouton H.J. Beukes Faculty of Industrial and Mechanical Eng. Electronics Laboratory University of Oulu FINLAND Faculty of Electrical IT and Computer Eng. Islamic Azad University Qazvin Iran Department of Electronic Electrical and Automatic Control Engineering Universitat Rovira i Virgili Tarragona Spain

An analysis of the effect of parasitics and reverse recovery on harmonic distortion in a class D audio amplifier is performed in this paper. The error sources under investigation are modelled empirically as an amplitude error, after which an existing strategy based on Newton's numerical method is implemented to simulate its effect within the audible band. The results are compared to existing timing errors to determine its degree of dominance.

关键词： Inductors Performance analysis Harmonic distortion MOSFET circuits Power semiconductor switches Frequency Voltage control Harmonic analysis Timing Total harmonic distortion

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Review of prognostic problem in condition-based maintenance

Review of prognostic problem in condition-based maintenance

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European control Conference (ECC)

作者： Otilia Elena Dragomir Rafael Gouriveau Florin Dragomir Eugenia Minca Noureddine Zerhouni Electrical Engineering Faculty Valahia University of Târgoviste Târgoviste Romania Automatic Control and Micro-Mechatronic Systems Department FEMTO-ST Institute CNRS - UFC / ENSMM / UTBM Besançon France

Prognostic is nowadays recognized as a key feature in maintenance strategies as it should allow avoiding inopportune maintenance spending. Real prognostic systems are however scarce in industry. That can be explained from different aspects, on of them being the difficulty of choosing an efficient technology: many approaches to support the prognostic process exist, whose applicability is highly dependent on industrial constraints. Thus, the general purpose of the paper is to explore the way of performing failure prognostics so that manager can act consequently. Different aspects of prognostic are discussed. The prognostic process is (re)defined and an overview of prognostic metrics is given. Following that, the “prognostic approaches” are described. The whole aims at giving an overview of the prognostic area, both from the academic and industrial points of views.

关键词： Maintenance engineering Hidden Markov models Mathematical model Autoregressive processes Degradation Vibrations Accuracy

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TRT system for Heat Pumps Design

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IFAC Proceedings Volumes 2009年第1期42卷 222-225页

作者： Radovan Hájovský Jiří Koziorek Bohumil Horák VŜB- Technical University of Ostrava Faculty of Electrical engineering and Informatics Department of measurement and control 17.listopadu 15 708 33 Ostrava Poruba Czech Republic Tel. +420 59 732 4221 Fax: +420 59 732 3138

The paper deals with problematic of Thermal Response Test (TRT) system. The correct design of borehole heat exchangers for ground source heat pumps and the knowledge of rock massive thermal properties is paramount. For small heat pumps systems these parameters are estimated. However, for larger objects the thermal conductivity should be measured on site. Thermal Response Test is an useful tool for thermal conductivity estimation. This test is instrumental to find out a response of rock massive in which a heat pump might be installed. The paper describes basic principles of TRT and its utilization for heat pump boreholes design.

关键词： Heat Pump Measuring Design TRT Borehole Thermal Conductivity control System

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Combination of activity and lying/standing data for detection of oestrus in cows

Combination of activity and lying/standing data for detectio...

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4th European Conference on Precision Livestock Farming, ECPLF 2009

作者： Jónsson, R.I. Blanke, M. Poulsen, N.K. Munksgaard, L. Højsgaard, S. Dept. of Electrical Engineering Tech. Univ. of Denmark DK-2800 Kgs. Lyngby Denmark Automation and Control Dept. of Informatics and Math. Modelling Tech. Univ. of Denmark DK-2800 Kgs. Lyngby Denmark Faculty of Agricultural Sciences Institute of Animal Health Welfare and Nutrition University of Aarhus Blichers Allé 20 DK-8830 Tjele Denmark Faculty of Agricultural Sciences Institute of Genetics and Biotechnology University of Aarhus Blichers Allé 20 DK-8830 Tjele Denmark

ISBN: (纸本)9789086861125

The objective of this study is to develop an algorithm for detecting oestrus in dairy cows from measurements of activity and duration of lying/standing periods. The algorithm derived in this paper analyses measurements of activity and measurements of lying/standing periods. Each cows activity is measured by a necklace attached sensor that returns an activity index for each hour. Lying period duration is measured by a sensor attached on the cows hind leg. Activity and lying/standing behaviour are modelled as a discrete event system, constructed using automata theory. In an attempt to capture a biologically inspired lying balance, a lying balance indicator is constructed and is influencing transition probabilities in the stochastic automaton. The cows lying-balance indicates how much the cow has been resting during the immediately past period, and the balance express to the automaton, the tendency of the cow to continue resting or not. Change detectors are designed based on probability maximization ideas and results of decision algorithms are presented for oestrus detection. Detection based on the lying balance indicator and the two sets of measured information are demonstrated to increase the detection sensitivity to 100% for the set of ten cows.

关键词： Discrete event simulation

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Droop based control of parallel-connected single-phase inverters in D-Q rotating frame

Droop based control of parallel-connected single-phase inver...

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IEEE International Conference on Industrial Technology (ICIT)

作者： Saeed Golestan Mahmood Joorabian Hasan Rastegar Arman Roshan Josep M. Guerrero Faculty of Electrical Engineering Amirkabir University of Technology슠 Tehran Iran Shahid Chamran University Ahvaz Iran Center of Power Electronics Systems Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Automatic Control Systems Computer Engineering Universitat Poliltècnica de Catalunya Barcelona Spain

ISBN: (纸本)9781424435067

In this paper, control of parallel single-phase inverters in direct-quadrature(DQ) rotating frame based on droop method is proposed. For each inverter, a secondary orthogonal imaginary circuit is created to provide the second phase required for the transformation; thus a DQ model of the inverter is obtained. The DQ transformation provides a time-invariant model of the inverter which makes the control design similar to that of dc-dc converters. The recognition of this analogy is important in that all of advanced dc-dc converters control techniques that have been previously developed can be applied to the control parallel inverters. The controller then is designed in DQ frame. Theoretically, infinite loop gain can be achieved in DQ rotating frame resulting in the elimination of the steady state error at the fundamental frequency of the inverter. The output impedance of the inverters is also considered, to ensure the decoupling between active and reactive power control using droop method. Simulation results are provided to prove the concept.

关键词： Inverters Communication system control Circuits DC-DC power converters Uninterruptible power systems Power system reliability control systems control design Frequency Reactive power control

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Object shape description using Haar-Wavelet functions

Object shape description using Haar-Wavelet functions

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2008 3rd International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA

作者： Nabout, Adnan Abou Tibken, Bernd Dept. of Automatic Control Faculty of Electrical Information and Media Engineering University of Wuppertal Wuppertal Germany

ISBN: (纸本)1424417511

Similar to the shape description using Mexican Hat Wavelet functions we present in this paper the derivation of object descriptors using Haar Wavelets. The derivation is based on the continuous wavelet transformation of an angle function using the Haar function as mother wavelet. The angle function which represents a given object shape is derived from the extracted contour polygon by computing the angle differences between the angles at every position on the contour and the angle at the starting point. This angle function is periodical but with 2 offset and can be normalized in order to be independent of the object's size, it's position and orientation. The angle function depends only on the starting point on the given contour. Moreover, the used angle function doesn't include any singularity which might arise due to object rotations. The derived Wavelet descriptors were used in an agricultural application to recognize weed species. The paper presents in this context some derived results as well as possible solution for the problem of starting point.

关键词： Object recognition

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