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
- 1998
768.
Kleffmann, Jörg; Becker, Karl Heinz; Wiesen, Peter
Investigation of the heterogeneous NO2 conversion on perchloric acid surfaces
Journal of the Chemical Society - Faraday Transactions, 94 (21) :3289-3292
1998
Herausgeber: Royal Society of Chemistry767.
Shestakov, Oleg; Gielen, R.; Fink, Ewald H.
LIF Studies of the A\verb=~= \(^{1}\)A' States of BiOH and BiOD
Journal of Molecular Spectroscopy, 192 (1) :111-118
1998
Herausgeber: Academic Press766.
Shestakov, Oleg; Gielen, R.; Fink, Ewald H.
LIF Studies of the A\verb=~= \(^{1}\)A' States of BiOH and BiOD
Journal of Molecular Spectroscopy, 192 (1) :111-118
1998
Herausgeber: Academic Press765.
Shestakov, Oleg; Gielen, R.; Fink, Ewald H.
LIF Studies of the A~ 1A' States of BiOH and BiOD
Journal of Molecular Spectroscopy, 192 (1) :111-118
1998
Herausgeber: Academic Press764.
Shestakov, Oleg; Gielen, R.; Pravilov, A. M.; Setzer, Klaus-Dieter; Fink, Ewald H.
LIF study of the b\(^{1}\)\(\Sigma\)\(^{+}\)(b0\(^{+}\)) ↔ X\(^{3}\)\(\Sigma\)\(^{-}\)(X\(_{1}\)0\(^{+}\),X\(_{2}\)1) transitions of SbH and SbD
Journal of Molecular Spectroscopy, 191 (1) :199-205
1998
Herausgeber: Academic Press763.
Shestakov, Oleg; Gielen, R.; Pravilov, A. M.; Setzer, Klaus-Dieter; Fink, Ewald H.
LIF study of the b\(^{1}\)\(\Sigma\)\(^{+}\)(b0\(^{+}\)) ↔ X\(^{3}\)\(\Sigma\)\(^{-}\)(X\(_{1}\)0\(^{+}\),X\(_{2}\)1) transitions of SbH and SbD
Journal of Molecular Spectroscopy, 191 (1) :199-205
1998
Herausgeber: Academic Press762.
Shestakov, Oleg; Gielen, R.; Pravilov, A. M.; Setzer, Klaus-Dieter; Fink, Ewald H.
LIF study of the b1Σ+(b0+) ↔ X3Σ-(X10+,X21) transitions of SbH and SbD
Journal of Molecular Spectroscopy, 191 (1) :199-205
1998
Herausgeber: Academic Press761.
Bartel, A.
MultiROW within P-Star. A Feasibility Study
Unclassified NatLab Report No. 1998/824
Herausgeber: Philips Electronics
1998760.
Gilg, A
Numerical circuit simulation Grund, F, s Borchardt, J Gunther, M, s Gilg, A
Surveys on Mathematics for Industry, 8 (3) :165--170
1998
Herausgeber: Wien; New York: Springer-Verlag, 1991-c2005.759.
Le Tallec, P; Perlat, JP; Struckmeier, J
Numerical modeling of gas flows in the transition between rarefied and continuum regimes
Numerical Flow Simulation I: CNRS-DFG Collaborative Research Programme, Results 1996--1998 :222--241
1998
Herausgeber: Springer Berlin Heidelberg758.
Wöhrle, D.; Tausch, Michael W.; Stohrer, W.-D.
PHOTOCHEMIE - Konzepte, Methoden, Experimente
Herausgeber: Wiley-VCH, Weinheim
1998757.
Schmidt, Sven; Benter, Thorsten; Schindler, Ralph N.
Photodissociation dynamcis of ClO radicals in the range (237<λ<270) nm and at 205 nm and the velocity distribution of O(1D) atoms
Chemical Physics Letters, 282 (3-4) :292-298
1998756.
Schmidt, Sven; Benter, Thorsten; Schindler, Ralph N.
Photodissociation dynamcis of ClO radicals in the range (237
Chemical Physics Letters, 282 (3-4) :292-298
1998755.
Schmidt, Sven; Benter, Thorsten; Schindler, Ralph N.
Photodissociation dynamcis of ClO radicals in the range (237
Chemical Physics Letters, 282 (3-4) :292-298
1998754.
Günther, Michael
Simulating digital circuits numerically - a charge-oriented ROW approach
Numerische Mathematik, 79 (2) :203–212
1998
Herausgeber: Springer New York753.
G\"unther, Michael
Simulating digital circuits numerically -- a charge-oriented {ROW} approach
Numer.~Math., 79 :203--212
1998752.
Günther, Michael
Simulating digital circuits numerically--a charge-oriented ROW approach
Numerische Mathematik, 79 (2) :203--212
1998
Herausgeber: Springer-Verlag751.
Tausch, Michael W.
Sinn(e) der Fachdidaktik
{CHEMKON}, 5 (4) :173--173
1998
Herausgeber: Wiley750.
Becker, Karl Heinz; Kleffmann, Jörg; Negri, R. Martin; Wiesen, Peter
Solubility of nitrous acid (HONO) in ammonium sulfate solutions
Journal of the Chemical Society - Faraday Transactions, 94 (11) :1583-1586
1998
Herausgeber: The Royal Society of Chemistry749.
Becker, Karl Heinz; Kleffmann, Jörg; Negri, R. Martin; Wiesen, Peter
Solubility of nitrous acid (HONO) in ammonium sulfate solutions
Journal of the Chemical Society - Faraday Transactions, 94 (11) :1583-1586
1998
Herausgeber: The Royal Society of Chemistry748.
Becker, Karl Heinz; Kleffmann, Jörg; Negri, R. Martin; Wiesen, Peter
Solubility of nitrous acid (HONO) in ammonium sulfate solutions
Journal of the Chemical Society - Faraday Transactions, 94 (11) :1583-1586
1998
Herausgeber: The Royal Society of Chemistry747.
[german] Tausch, Michael W.; Grolmuss, A.; Woock, M.
Vom Lichtquant zum Sehreiz
Praxis der Naturwissenschaften (Physik), 47 (5) :26
1998- 1997
746.
G\"unther, Michael
Modelling transmission lines effects in integrated circuits by a mixed system of {DAEs} and {PDEs}
In I.~Troch and F.~Breitenecker, Editor, 2nd MATHMOD Vienna. Proceedings IMACS Symposium on Mathematical ModellingBand11ausArgesim Report, Seite 535--540
In I.~Troch and F.~Breitenecker, Editor
Herausgeber: TU Wien
Februar 1997745.
Arnold, A.; Ehrhardt, M.
A New Discrete Transparent Boundary Condition for Standard and Wide Angle 'Parabolic' Equations in Underwater Acoustics
Proceedings of the Third International Conference on Theoretical and Computational Acoustics, July 14-18, 1997, Newark, New Jersey, USA, Seite 623-635
1997744.
Ehrgott, Matthias; Hamacher, Horst W.; Klamroth, Kathrin; Nickel, Stefan; Schöbel, Anita; Wiecek, Margaret M.
A note on the equivalence of balance points and Pareto solutions in multiple objective programming
Journal of Optimization Theory and Applications, 92 :209-212
1997
