Computational Magnetics
Many electro-technical devices such as e.g. printed circuit boards, electrical drives and antenna systems can be simulated on the basis of electrical circuits. However, the increasing frequencies and the decreasing size force designers to account for wave propagation effects, eddy-current effects, ferromagnetic saturation and hysteresis. For wave propagation effects and eddy-current effects, the results of stand-alone field simulation can be represented by an order-reduced equivalent model, which is then inserted in the overall circuit model. The representation of field-dependent nonlinearities and hysteresis effects, however, is not straightforward.
2D Simulation of a Transformer
The coupled field and circuit simulation becomes troublesome when a large number of time steps is required. This occurs when e.g. simulating an electrical drive where the machine requires 10 periods of 50 Hz to reach nominal speed whereas the switching of the Insulated Gate Bipolar Transistors in the frequency converter switches at 20 kHz, necessitating a time steps in the order of a microsecond to be used in the simulation. Since the field model consists typically of a few million degrees of freedom, all those unknowns have to be solved in every time step. Fortunately, the relevant time constants in electrical-energy converter are in the range 50 Hz. Hence the field model does not have to be time-stepped at the same rate as the circuit model, in which fast switches are present. The use of adaptive multirate time-integration schemes can reduce the numerical complexity of the problem substantially.
Research Questions
- Efficiency of the time-integration for field devices in pulsed circuits (multirate, dynamic iteration)
- DAE-index of the coupled system
- Existence and Uniqueness of the solution
Cooperation
- Herbert De Gersem, Katholieke Universiteit Leuven
- Markus Clemens, Bergische Universität Wuppertal
- Sascha Baumanns, Universität zu Köln
Former and ongoing projects
Publications
- 1995
568.
Wiesen, Peter; Kleffmann, Jörg; Kurtenbach, Ralf; Becker, Karl Heinz
Mechanistic study of the heterogeneous conversion of NO\(_{2}\) into HONO and N\(_{2}\)O on acid surfaces
Faraday Discussions, 100 (2) :121-127
1995567.
Wiesen, Peter; Kleffmann, Jörg; Kurtenbach, Ralf; Becker, Karl Heinz
Mechanistic study of the heterogeneous conversion of NO2 into HONO and N2O on acid surfaces
Faraday Discussions, 100 (2) :121-127
1995566.
Denk, Georg; Feldmann, Uwe; Günther, Michael
Modeling and simulating charge sensitive MOS circuits
1995565.
Bunker, Philip R.; Kolbuszewski, M.; Jensen, Per; Brumm, Martin; Anderson, M. A.; Barclay, W. L.; Ziurys, L. M.; Ni, Y.; Harris, David O.
New rovibrational data for MgOH and MgOD and the internuclear potential function of the ground electronic state
Chemical Physics Letters, 239 (4-6) :217-222
1995564.
Bunker, Philip R.; Kolbuszewski, M.; Jensen, Per; Brumm, Martin; Anderson, M. A.; Barclay, W. L.; Ziurys, L. M.; Ni, Y.; Harris, David O.
New rovibrational data for MgOH and MgOD and the internuclear potential function of the ground electronic state
Chemical Physics Letters, 239 (4-6) :217-222
1995563.
Bunker, Philip R.; Kolbuszewski, M.; Jensen, Per; Brumm, Martin; Anderson, M. A.; Barclay, W. L.; Ziurys, L. M.; Ni, Y.; Harris, David O.
New rovibrational data for MgOH and MgOD and the internuclear potential function of the ground electronic state
Chemical Physics Letters, 239 (4-6) :217-222
1995562.
Günther, Michael; Simeon, Bernd
Praktikum Wissenschaftliches Rechnen auf dem HRZ-Vektorparallelrechner VPP
Preprint (1785)
1995
Herausgeber: Technische Hochschule Darmstadt561.
Denk, Ceorg; Günther, Michael; Kahlert, Martin; Paffrath, Meinhard; Rentrop, Peter; Wever, Utz; Zheng, Q
Recent advances in electronic industry by numerical simulation
Preprint (1784)
1995
Herausgeber: Technische Hochschule Darmstadt560.
Heilmann, Margareta
Saturation of linear combinations of Baskakov-Durrmeyer-type operators
Applicable Analysis, 59 (1-4) :93-107
1995559.
Becker, Karl Heinz; Kurtenbach, Ralf; Schmidt, Frank; Wiesen, Peter
Temperature and pressure dependence of the NCO + C\(_{2}\)H\(_{2}\) reaction
Chemical Physics Letters, 235 (3-4) :230-234
1995558.
Becker, Karl Heinz; Kurtenbach, Ralf; Schmidt, Frank; Wiesen, Peter
Temperature and pressure dependence of the NCO + C\(_{2}\)H\(_{2}\) reaction
Chemical Physics Letters, 235 (3-4) :230-234
1995557.
Becker, Karl Heinz; Kurtenbach, Ralf; Schmidt, Frank; Wiesen, Peter
Temperature and pressure dependence of the NCO + C2H2 reaction
Chemical Physics Letters, 235 (3-4) :230-234
1995556.
G\"unther, Michael; Feldmann, U.
The {DAE}-index in electric circuit simulation
Mathematics and Computers in Simulation, 39 :573--582
1995555.
Günther, Michael; Feldmann, Uwe
The DAE-index in electric circuit simulation
Mathematics and Computers in Simulation, 39 (5) :573–582
1995
Herausgeber: Elsevier554.
Günther, Michael; Feldmann, Uwe
The DAE-index in electric circuit simulation
Mathematics and Computers in Simulation, 39 (5-6) :573--582
1995
Herausgeber: North-Holland553.
Shestakov, Oleg; Fink, Ewald H.
The Lowest Quartet States, a\(^{4}\)\(\Pi\) and b\(^{4}\)\(\Sigma\)\(^{-}\), of SbO
Journal of Molecular Spectroscopy, 172 (1) :215-224
1995
Herausgeber: Academic Press552.
Shestakov, Oleg; Fink, Ewald H.
The Lowest Quartet States, a\(^{4}\)\(\Pi\) and b\(^{4}\)\(\Sigma\)\(^{-}\), of SbO
Journal of Molecular Spectroscopy, 172 (1) :215-224
1995
Herausgeber: Academic Press551.
Shestakov, Oleg; Fink, Ewald H.
The Lowest Quartet States, a4Π and b4Σ-, of SbO
Journal of Molecular Spectroscopy, 172 (1) :215-224
1995
Herausgeber: Academic Press550.
Kolbuszewski, M.; Bunker, Philip R.; Jensen, Per
The Potential Energy Function of CS\(_{2}\) Derived from Rovibrational Data
Journal of Molecular Spectroscopy, 170 (1) :158-165
1995
Herausgeber: Academic Press549.
Kolbuszewski, M.; Bunker, Philip R.; Jensen, Per
The Potential Energy Function of CS\(_{2}\) Derived from Rovibrational Data
Journal of Molecular Spectroscopy, 170 (1) :158-165
1995
Herausgeber: Academic Press548.
Kolbuszewski, M.; Bunker, Philip R.; Jensen, Per
The Potential Energy Function of CS2 Derived from Rovibrational Data
Journal of Molecular Spectroscopy, 170 (1) :158-165
1995
Herausgeber: Academic Press547.
Denk, Georg; Feldmann, Uwe; Günther, Michael; Rentrop, Peter
Topics in electric circuit simulation
Preprint (1740)
1995
Herausgeber: Technische Hochschule Darmstadt546.
Benter, Thorsten; Feldmann, Ch R.; Kirchner, Ulf; Schmidt, M.; Schmidt, Sven; Schindler, Ralph N.
UV/VIS-absorption Spectra of HOBr and CH\(_{3}\)OBr; Br(\(^{2}\)P\(_{3/2}\)) Atom Yields in the Photolysis of HOBr
Berichte der Bunsengesellschaft für physikalische Chemie, 99 (9) :1144-1147
1995545.
Benter, Thorsten; Feldmann, Ch R.; Kirchner, Ulf; Schmidt, M.; Schmidt, Sven; Schindler, Ralph N.
UV/VIS-absorption Spectra of HOBr and CH\(_{3}\)OBr; Br(\(^{2}\)P\(_{3/2}\)) Atom Yields in the Photolysis of HOBr
Berichte der Bunsengesellschaft für physikalische Chemie, 99 (9) :1144-1147
1995544.
Benter, Thorsten; Feldmann, Ch R.; Kirchner, Ulf; Schmidt, M.; Schmidt, Sven; Schindler, Ralph N.
UV/VIS-absorption Spectra of HOBr and CH3OBr; Br(2P3/2) Atom Yields in the Photolysis of HOBr
Berichte der Bunsengesellschaft für physikalische Chemie, 99 (9) :1144-1147
1995
