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1
Content available Cross-correlation technique for revealing defects in pulsed eddy current defectoscopy
Jansa J., Slobodnik K., Karban P., Dolezel I.
Poznan University of Technology Academic Journals. Electrical Engineering
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2014
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No. 77
47--53
EN
Important aspects of the cross-correlation in the pulsed eddy current defectoscopy are analyzed and discussed. The application of the technique is described and illustrated with an example of an artificial defect in an electrically conductive steel plate. The results of the measurements are compared with the data obtained for the reference defect.
2
Content available remote The quality of electric power supplied into the grid by co-generation units
Jansa J., Moldrik P., Minarik D.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 11
73-76
EN
This paper deals with the utilisation of firedamp for combined heat and electric power generation. The firedamp is gained from hard-coal mines and can be combusted in a co-generation units with gas-engine. This process involves more efficient utilisation of firedamp. The measurement results obtained on selected co-generation units are described in this paper. As far as the electric power supplied into the grid from cogeneration unit´s are concerned, these shall be considered with respect to the qualitative parameters, which should comply with stipulations of the CSN EN 50160 standard. The main advantages and disadvantages of co-generation units producing heat for hard-coal mine and electric power for export to the grid are described in the end of this paper.
PL
Opisano możliwość wykorzystania gazu kopalnianego do ogrzewania i wytwarzania energii. Gaz może być wykorzystany w kogeneratorze z silnikiem gazowym. Opisano wybrane systemy wytwarzania energii.
3
Content available Numerical modeling of transient acoustic field using finite element method
Koudela L., Jansa J., Karban P.
Poznan University of Technology Academic Journals. Electrical Engineering
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2013
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No. 73
155--160
EN
Numerical solution of acoustic wave equation in the time domain is performed. The appropriate mathematical model is described by the partial differential wave equation supplemented with appropriate boundary conditions. The goal is to obtain the time evolution of the distribution of acoustic pressure, which can serve as the basis for the solution of various subsequent problems. The paper discusses the results of the numerical analysis of a semicircular acoustic diffuser in a free field, realized by a fully adaptive higher-order finite element method implemented in our own codes Agros2D and Hermes. The results are compared with the data obtained by the commercial code Comsol Multiphysics.
4
Content available Comparison of efficiency of electrostatic micro-actuators for precise positioning
Štarman V., Kacerovský J., Jansa J., Karban P., Doležel I.
Poznan University of Technology Academic Journals. Electrical Engineering
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2013
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No. 73
29--34
EN
Comparison of several types of electrostatic micro-actuators is carried out, particularly with respect to their resultant force effects. The continuous mathematical model of such actuators is mostly described by the Laplace equation. In this paper, its numerical solution is performed by a fully adaptive higher-order finite element method, using a code developed by the authors. The methodology is illustrated by typical examples whose results are discussed.
5
Content available Numerical modeling of Gauss monocycle pulse in transient acoustic field
Koudela L., Jansa J., Karban P.
Computer Applications in Electrical Engineering
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2013
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Vol. 11
141--147
EN
Numerical solution of acoustic wave equation in the time domain is performed. The mathematical model is described by the partial differential wave equation supplemented with appropriate boundary conditions. The goal is to obtain the time evolution of the distribution of acoustic pressure, which can serve as the basis for the solution of various subsequent problems. The paper discusses the results of the numerical analysis of the Gauss monocycle pulse that proceeds from the signal source and incident on the semi-circular acoustic diffuser in a free field, realized by a fully adaptive higherorder finite element method implemented in codes Agros2D and Hermes developed by the hp-FEM group. Selected results of the computations are compared with the data obtained by the commercial code COMSOL Multiphysics.
6
Content available Electrostatic microactuators for precise positioning and comparison of their parameters
Štarman V., Kacerovský J., Jansa J., Karban P., Doležel I.
Computer Applications in Electrical Engineering
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2013
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Vol. 11
122--127
EN
Comparison of several types of electrostatic microactuators is carried out, particularly with respect to their resultant force effects. The continuous mathematical model of such actuators is mostly described by the Laplace equation. In this paper, its numerical solution is performed by a fully adaptive higher-order finite element method, using a code developed by the authors. The methodology is illustrated with typical examples whose results are discussed.
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