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1
Content available remote Fully Adaptive Higher-Order Finite Element Model of Electric Field near High-Voltage Insulator for Outdoor Use
100%
Mach F. , Karban P.
Przegląd Elektrotechniczny
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2012
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tom R. 88, nr 7b
217-219
EN
Problems of automatic adaptivity in finite element method of higher order of accuracy are discussed. Particular attention is paid to the hpadaptivity that exhibits the highest level of flexibility and extremely fast convergence. The theoretical aspects are illustrated by an example of magnetic field near a high voltage insulator for outdoor use solved numerically by our own code Agros2D. The results are compared with data obtained by other commercial codes.
PL
Przedyskutowano problem automatycznej adaptacji metody elementów skończonych. Szczególną uuwagę zwrócono na adaptacyjność typu hp charakteryzującą się dobrą elastycznością i szybką zbieżnością. Zagadnienie rozważano na przykładzie analizy pola magnetycznego w pobliżu izolatora wysokonapięciowego.
2
Content available Higher-order model of electromagnetic valve for control of liquid flow
80%
Mach F. , Karban P. , Doležel I.
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tom Vol. 12
21--29
EN
An electromagnetic valve for control of flow of electrically non-conductive liquids is proposed and modeled. The device contains only one movable part (a cylindrical plunger) whose movement is controlled by a secondary magnetic circuit with a high-parameter permanent magnet and current in the field coil. The paper presents its mathematical model that is solved numerically. For computations we used our own code Agros2D based on a fully adaptive higher-order finite element method. The static characteristics of the device are calculated using a modified version of the Eggshell method in order to avoid undesirable peaks and oscillations. The principal results are evaluated and discussed.
3
Content available Cross-correlation technique for revealing defects in pulsed eddy current defectoscopy
80%
Jansa J. , Slobodnik K. , Karban P. , Dolezel I.
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tom 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.
4
Content available remote Induction heating of nonmagnetic cylindrical billets by rotation in magnetic field produced by static permanent magnets
80%
Karban P. , Mach F. , Doleżel I.
Przegląd Elektrotechniczny
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2010
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tom R. 86, nr 12
53-56
EN
Induction heating of nonmagnetic cylindrical billets by rotation in magnetic field produced by static permanent magnets is modeled. Numerical analysis of the process is carried out in the hard-coupled formulation, using own code based on higher-order finite element method. The methodology is illustrated by a typical example and the most important results are validated by an experiment.
PL
W artykule przedstawiono model grzania indukcyjnego wkładu cylindrycznego poprzez rotację w polu magnetycznym magnesu trwałego. Analiza numeryczna przeprowadzona jest dla sformułowania bazującego na silnym sprzężeniu przy użyciu własnego kodu wykorzystującego metodę elementów skończonych wyższych rzędów. Metodykę analizy zilustrowano typowym przykładem a najważniejsze wyniki są skonfrontowane z wynikami eksperymentu.
5
Content available remote Induction Heating of Cylindrical Billets in Magnetic Field Produced by Permanent Magnets: Simulation and Experiments
80%
Doležel I. , Mach F. , Karban P. , Musálek L.
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tom R. 89, nr 3a
250--252
EN
A complete overview of results is presented concerning induction heating of nonmagnetic cylindrical billets in magnetic field produced by permanent magnets. The authors proposed and modelled two possible ways of the process. The billet either rotates inside a system of appropriately arranged static permanent magnets or a ring containing such magnets rotates around an unmoving billet. Both arrangements were modelled numerically using fully adaptive higher-order finite element method and some results were verified by experiments on a physical model built in our lab.
PL
W pracy opisano rezultaty modelowania procesu nagrzewania indukcyjnego kęsów aluminiowych w polu magnetycznym wytwarzanym przez magnesy stałe. Autorzy proponują i modelują dwa warianty technologii. Kęs może być obracany wewnątrz zestawu odpowiednio ustawionych magnesów lub pierścień magnesów jest obracany względem nieruchomego kęsa. Oba warianty były symulowane przy pomocy w pełni adaptacyjnej metody elementów skończonych wyższych rzędów. Niektóre wyniki symulacji porównano z modelem fizycznym zbudowanym przez autorów.
6
Content available remote Hard-coupled model of induction heating of cylindrical nonmagnetic billets rotating in system of permanent magnets
80%
Karban P. , Mach F. , Doležel I.
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tom R. 87, nr 12b
78--81
EN
A new technology of induction heating of nonmagnetic cylindrical billets by their rotation in static magnetic field produced by a system of permanent magnets is presented and modeled. Analyzed is effectiveness of the process (particularly the time necessary for reaching a prescribed average temperature) in the dependence of the arrangement of the permanent magnets. The methodology is illustrated by a typical example.
PL
Zaprezentowano nową technologię grzania indukcyjnego sztabek cylindrycznych niemagnetycznych poprzez ich rotację t statycznym polu magnetycznym wytwarzanym przez system magnesów trwałych Analizowana jest skuteczność systemu, ale też czas konieczny do osiągnięcia założonej średniej temperatury w zależności od ustawienia magnesów trwałych. Przedstawiona technologia została zilustrowana typowym przykładem.
7
Content available Higher-order model of electromagnetic valve for control of liquid flow
80%
Mach F. , Karban P. , Doležel I.
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tom No. 77
39--46
EN
An electromagnetic valve for control of flow of electrically non-conductive liquids is proposed and modeled. The device contains only one movable part (a cylindrical plunger) whose movement is controlled by a secondary magnetic circuit with a high-parameter permanent magnet and current in the field coil. The paper presents its mathematical model that is solved numerically. For computations we used our own code Agros2D based on a fully adaptive higher-order finite element method. The static characteristics of the device are calculated using a modified version of the Eggshell method in order to avoid undesirable peaks and oscillations. The principal results are evaluated and discussed.
8
Content available Numerical modeling of transient acoustic field using finite element method
80%
Koudela L. , Jansa J. , Karban P.
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2013
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tom 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.
9
Content available Higher-order finite element particle tracing in external electrostatic field
80%
Mach F. , Karban P. , Doležel I.
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tom No. 69
23--31
EN
Simulation of movement of a large number of charged particles in external electrostatic field is of great importance for a correct design of separators whose aim is to select them according to the sign of their charge. The paper deals with modeling of their trajectories in a specific arrangement consisting of a profile vessel equipped with two electrodes and several collecting bins. Electric field between the electrodes is determined using a fully adaptive higher-order finite element method. The movement (velocities and trajectories) of the particles affected by electric field, gravity and aerodynamic resistance is modeled by an adaptive Runge-Kutta-Fehlberg method with an appropriately varying time step. On the other hand, their charges are rather low, so that it is possible to neglect the Coulomb forces acting among them. The methodology is illustrated by a typical example whose results are discussed.
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Content available remote Continual induction hardening of 3D steel bodies of specific geometries
80%
Barglik J. , Dolezel I. , Karban P.
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2006
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tom z. 108
107-116
EN
The paper deals with simulation of continual surface induction hardening of 3D steel bodies that represents, from the physical point of view, a complicated coupled problem. Derived is its basic mathematical model consisting of two partia! differential eąuations with time variable boundary conditions that describe the distribution of electromagnetic and temperature fields. These fields are solved numerically by combination of professional codes and procedures developed and written by the authors. The methodology is illustrated on an example whose results are discussed.
11
Content available Electrostatic microactuators for precise positioning and comparison of their parameters
71%
Štarman V. , Kacerovský J. , Jansa J. , Karban P. , Doležel I.
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2013
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tom 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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