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Computer-aided system for measuring temperature of rotating elements 4

Computer-aided system for measuring temperature of rotating ...

4th IMEKO TC4 Conference on Advanced A/D and D/A Conversion Techniques and Their Applications and the 7th Workshop on ADC Modelling and Testing 2002

作者： Zloto, Tadeusz Biernacki, Zygmunt Kurkowski, Marek Ptak, Pawel Institute of Electronics and Control Systems Czestochowa Technical University Poland Institute of Machine Technology and Production Automation Czestochowa Technical University Poland

ISBN: (纸本)9781634391832

The paper includes a review of currently used devices for measuring temperature of rotating parts of machines. In the subsequent section it describes a computeraided measuring system developed by the authors. Using the optoelectronic measuring path, the system is employed for measuring temperature of cylinder block of an axial multipiston pump. Besides, the application of DasyLab software package for the above mentioned measurements is presented. Copyright © (2002) by the International Measurement Confederation (IMEKO).

关键词： Application programs

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Analysis of accuracy and measurements of flowing medium parameters by means of a wave thermoanemometer system 4

Analysis of accuracy and measurements of flowing medium para...

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4th IMEKO TC4 Conference on Advanced A/D and D/A Conversion Techniques and Their Applications and the 7th Workshop on ADC Modelling and Testing 2002

作者： Biernacki, Zygmunt Zloto, Tadeusz Kurkowski, Marek Ptak, Pawel Institute of Electronics and Control Systems Czestochowa Technical University Poland Institute of Machine Technology and Production Automation Czestochowa Technical University Poland

ISBN: (纸本)9781634391832

The paper analyses the measurement accuracy of selected parameters, such as flow velocity and temperature, of a flowing medium, by means of the thermoanemometric method. The core of the method relies on the Wave Thermoanemometer System constructed by one of the authors [1]. The sources of boundary error components are analysed within the signal conversion channels of the WTS. Errors are examined by means of relevant mathematical expressions representing signal conversion both in the velocity measuring channel and in temperature measuring channel. The algorithms have been developed for perfect and for real conditions. The theoretical considerations have been verified by laboratory tests performed by computerized equipment. Copyright © (2002) by the International Measurement Confederation (IMEKO).

关键词： Flow velocity

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Nonlinear analysis and control of a continuous fermentation process

Nonlinear analysis and control of a continuous fermentation ...

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作者： Szederkényi, G. Kristensen, N.R. Hangos, K.M. Bay Jørgensen, S. Systems and Control Research Laboratory Computer and Automation Institute HAS P.O. Box 63 H-1518 Budapest Hungary Department of Chemical Engineering Technical University of Denmark DK-2800 Lyngby Denmark

Different types of nonlinear controllers are designed and compared for a simple continuous bioreactor operating near optimal productivity. This operating point is located close to a fold bifurcation point. Nonlinear analysis of stability, controllability and zero dynamics is used to investigate open-loop system properties, to explore the possible control difficulties and to select the system output to be used in the control structure. A wide range of controllers are tested including pole placement and LQ controllers, feedback and input-output linearization controllers and a nonlinear controller based on direct passivation. The comparison is based on time-domain performance and on investigating the stability region, robustness and tuning possibilities of the controllers. controllers using partial state feedback of the substrate concentration and not directly depending on the reaction rate are recommended for the simple fermenter. Passivity based controllers have been found to be globally stable, not very sensitive to the uncertainties in the reaction rate and controller parameter but they require full nonlinear state feedback. © 2002 Published by Elsevier Science Ltd.

关键词： Fermentation

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LPV-modeling of a low-power gas turbine

LPV-modeling of a low-power gas turbine

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8th Mini Conference on Vehicle System Dynamics, Identification and Anomalies, VSDIA 2002

作者： Ailer, Piroska Szederkényi, Gábor Hangos, Katalin M. Aviation Technical Institute Miklós Zrínyi National Defence University POB. 1 H-5008 Szolnok Hungary Systems and Control Laboratory Computer and Automation Research Institute HAS POB. 63 H-1518 Budapest Hungary

The nonlinear dynamic model of gas turbines is derived from first engineering principles, which consists of differential conservation balances completed by algebraic constitutive relations. This nonlinear dynamic model can then be transformed into input-affine form. The coordinate-functions of the state equation f(x) have very complicated algebraic structures, while the functions gi,(x) are constants. Because of this fact, the nonlinear dynamic analysis of the model, such as investigation of controllability and stability, can only be performed with difficulty or in some cases it can not be done. To solve this problem and to investigate the controllability and stability of the model in a more effective way the nonlinear dynamic model has to be transformed into LPV (Linear Parameter-Varying) model. This LPV-model can then be effectively used to develop some types of controllers to improve the dynamic response of the engine. In this paper we show the possible ways and steps of the transformation being neither obvious nor unique and the final form of the LPV-model of a pilot-plant gas turbine, which is installed in the Budapest University of Technology and Economics. Department of Aircraft and Ships on a test stand.

关键词： Gas turbines

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Nonlinear modelling and model verification of a single protection valve

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Periodica Polytechnica Transportation Engineering 2002年第1-2期30卷 69-92页

作者： Németh, Huba Ailer, Piroska Hangos, Katalin M. Knorr-Bremse Res./Development Centre Major u. 69 H-1119 Budapest Hungary Aviation Technical Institute Miklos Zrinyi Natl. Def. Univ. P.O.B. 1 H-5008 Szolnok Hungary Systems and Control Laboratory Comp./Automation Research Institute Hungarian Academy of Sciences P.O.B. 63 H-1518 Budapest Hungary

A lumped parameter dynamic model of a single protection valve with electronic actuation in a brake system based on first engineering principles is presented in this paper for control design purposes. The model is developed in an index-1 differential-algebraic equation (DAE) form, and it is capable of describing the hybrid behaviour of the protection valve. The DAE model is transformed into its standard nonlinear input-affine state-space model form, which will be used for control design purposes. The developed model has been verified by simulation studies, where it is shown that it is capable to describe the dynamic behavior of the examined protection valve.

关键词： Valves (mechanical)

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On state and parameter estimation via innovation representation with applications to aquatic ecosystems 6

On state and parameter estimation via innovation representat...

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6th European control Conference, ECC 2001

作者： Kolemishevska-Gugulovska, T.D. Dimirovski, G.M. Stankovski, M.J. Dept. of Automation and Systems Engineering Faculty of Electrical Engineering SS Cyril and Methodius University SkopjeMK-91000 Macedonia Inst. of Automatic Control and El. Drives Faculty of Technical and Natural Science Johannes Kepler University Altenbergerstr. 69 LinzA-4040 Austria

ISBN: (纸本)9783952417362

The problem of simultaneous state and system parameter estimation for aquatic ecosystems is considered in this paper. This problem has been solved through the identification of an innovation dynamical model representation of the underlying process within the hydrological cycle of the ecosystem basin. A recursive prediction error (RPE) algorithm is derived for the joint system parameter and state estimation through minimization of the innovation variance (MIV). On the grounds of the case study on Ohridean Lake using recorded data by the Hydro-meteorological Institution a comparison analysis has been carries out between the methods of innovation variance minimization and of extended non-linear Kalman filter. © 2001 EUCA.

关键词： Aquatic ecosystems

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Representing membership functions as elements in function space

Representing membership functions as elements in function sp...

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American control Conference (ACC)

作者： Man Lung Wong Yeung Yam P. Baranyi Intelligent Control Systems Laboratory Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong New Territories Hong Kong China Department of Telecommunications and Telematics Technical University of Budapest Budapest Hungary

This paper generalizes the geometric representation of membership functions comprising a finite number of characteristic points. An extended class of membership functions, satisfying certain monotonicity conditions, can now be expressed as elements in the space of square integrable functions. Specifically, bell-shaped membership functions, which were not possible before, can now be accommodated with this generalized representation. An example interpolation problem, treated using both the finite-dimensional approach and the generalized approach, is included for illustration.

关键词： Interpolation Marine vehicles Fuzzy sets Bismuth Lungs Intelligent control Laboratories automation Telematics Artificial intelligence

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An evaluation of algorithms for computing the covariance function of a multivariable ARMA process 6

An evaluation of algorithms for computing the covariance fun...

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6th European control Conference, ECC 2001

作者： Soderstrom, Torsten Sebek, Michael Jezek, Jan Kucera, Vladimir Henrion, Didier Department of Systems and Control Information Technology Uppsala University P O Box 27 UppsalaS-751 03 Sweden Center for Applied Cybernetics Faculty of Electrical Engineering Czech Technical University in Prague Technicka 2 PragueCZ-16627 Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic P 0 Box 18 PragueCZ-182 08 Czech Republic Toulouse France

ISBN: (纸本)9783952417362

Computation of an ARMA covariance function is a common ingredient in analysis and synthesis of various problems in stochastic control, estimation and signal processing. In this paper, we present an algorithm based on simple polynomial calculations. Compared to alternative strategies, its computational load increases slowly with the order of the process. Further, it shows good numerical robustness and applies to multivariable ARMA processes, even with complex-valued coefficients. © 2001 EUCA.

关键词： Stochastic systems

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Using of evolutionary computations in image processing for quantitative atlas of drosophila genes expression

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European Workshop Applications of Evolutionary Computing, EvoWorkshops 2001: EvoCOP, EvoFlight, EvoIASP, EvoLearn, and EvoSTIM

作者： Spirov, Alexander V. Timakin, Dmitry L. Reinitz, John Kosman, David The Sechenov Institute of Evolutionary Physiology and Biochemistry 44 Thorez Ave. St. Petersburg194223 Russia Dept. of Automation and Control Systems St.-Petersburg State Technical University 29 Polytechnic St St.-Petersburg194064 Russia Dept. of Biochemistry and Molecular Biology Box 1020 Mt. Sinai Medical School One Gustave L. Levy Place New YorkNY10029 United States

ISBN: (纸本)3540419209

It is well known, that organism of animal, consisting of many billions cells, is formed by consequent divisions of the only cell - zygote. In so doing, embryo cells are permanently communicating by means of biochemical signals. As a result, proper genes were being activated at proper time in proper cells of the embryo. Modern confocal microscopes being equipped by lasers and computers give possibility to trace-through the cell fate of early embryo for such a classical model object, as fruit fly Drosophila melanogaster. By this approach, it is possible to retrace the detailed dynamics of activity of genes-controllers of development with the resolution on the level of individual nuclei for each of 4-6 thousand cells, composing early fly embryo. The final result of this analysis will be the quantitative atlas of Drosophila genes action (expression): http://***/ spirov/atlas. To achieve this aim we need to receive statistically authentic summary picture of detailed pattern dynamics proceeding from a large number of scanned embryos. This presupposes the elaboration of the methods of preprocessing, elastic deformation, registration and interpolation of the confocal-microscopy images of embryos. For this purpose we apply modern heuristic methods of optimization to the processing of our images. Namely classic GA approach is used for finding a suitable elastic deformation, for registering the images and for finding a Fourier interpolation of concentration (gene-expression) surfaces. All GA programs considered are the developments of "evolution strategies program" from EO-0.8.5 C++ library (Merelo). © Springer-Verlag Berlin Heidelberg 2001.

关键词： Gene expression

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Equivalence of disturbance observer structures for linear systems

Equivalence of disturbance observer structures for linear sy...

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IEEE Conference on Decision and control

作者： E. Schrijver J. van Dijk H. Nijmeijer Department of Mechanical Engineering and Automation University of Twente Netherlands Department of Mechanical Engineering Systems & Control Technical University Eindhoven Netherlands

ISBN: (纸本)0780366387

Several techniques exist to incorporate disturbance rejection requirements in a linear controller design. Contrary to, for example the H-infinity controller design technique where only one degree of freedom is available to obtain both disturbance rejection and performance, a disturbance observer adds a degree of freedom, thereby enabling a separate design of the disturbance rejection and the performance. There are many ways to design, implement and represent disturbance observers. We focus on two design methodologies and their corresponding representations. It can be shown that, in the case that the (SISO) plant is linear, the methodologies result in an equivalent disturbance observer. We use this equivalence to relate some properties well-known for one methodology to the other methodology, and vice versa.

关键词： Linear systems Automatic control State estimation Mechanical engineering control systems Design methodology Inverse problems Feedback loop Kalman filters Observers

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