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
- 1997
710.
Schindler, Ralph N.; Liesner, M.; Schmidt, Sven; Kirchner, Ulf; Benter, Thorsten
Identification of nascent products formed in the laser photolysis of CH3OCl and HOCl at 308 nm and around 235 nm. Total Cl-atom quantum yields and the state and velocity distributions of Cl(2Pj)
Journal of Photochemistry and Photobiology A: Chemistry, 107 (1-3) :9-19
1997709.
Chance, K. V.; Park, K.; Evenson, K. M.; Zink, L. R.; Stroh, Fred; Fink, Ewald H.; Ramsay, D. A.
Improved Molecular Constants for the Ground State of HO\(_{2}\)
Journal of Molecular Spectroscopy, 183 (2) :418
1997
Herausgeber: Academic Press708.
Chance, K. V.; Park, K.; Evenson, K. M.; Zink, L. R.; Stroh, Fred; Fink, Ewald H.; Ramsay, D. A.
Improved Molecular Constants for the Ground State of HO\(_{2}\)
Journal of Molecular Spectroscopy, 183 (2) :418
1997
Herausgeber: Academic Press707.
Chance, K. V.; Park, K.; Evenson, K. M.; Zink, L. R.; Stroh, Fred; Fink, Ewald H.; Ramsay, D. A.
Improved Molecular Constants for the Ground State of HO2
Journal of Molecular Spectroscopy, 183 (2) :418
1997
Herausgeber: Academic Press706.
Becker, Karl Heinz; Kurtenbach, Ralf; Schmidt, Frank; Wiesen, Peter
Kinetics of the Reactions of NCO Radicals with NO and NH\(_{3}\)
Berichte der Bunsengesellschaft für physikalische Chemie, 101 (1) :128-133
1997705.
Becker, Karl Heinz; Kurtenbach, Ralf; Schmidt, Frank; Wiesen, Peter
Kinetics of the Reactions of NCO Radicals with NO and NH\(_{3}\)
Berichte der Bunsengesellschaft für physikalische Chemie, 101 (1) :128-133
1997704.
Becker, Karl Heinz; Kurtenbach, Ralf; Schmidt, Frank; Wiesen, Peter
Kinetics of the Reactions of NCO Radicals with NO and NH3
Berichte der Bunsengesellschaft für physikalische Chemie, 101 (1) :128-133
1997703.
Tausch, Michael W.; Brandl, H.
Lichtbeteiligung bei chemischen Reaktionen
MNU, 50 :206
1997702.
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 1997701.
Günther, Michael
Modelling transmission lines effects in integrated circuits by a mixed system of DAEs and PDEs
In Troch, I. and Breitenecker, F., Editor, 2nd MATHMOD Vienna. Proceedings IMACS Symposium on Mathematical ModellingBand11ausArgesim Report 15, Seite 535–540
In Troch, I. and Breitenecker, F., Editor
Herausgeber: TU Wien
1997700.
Ehrgott, Matthias; Klamroth, Kathrin
Nonconnected efficiency graphs in multiple criteria combinatorial optimization
In Caballero, R. and Ruiz, F. and Steuer, R.E., Editor, Advances in Multiple Objective and Goal ProgrammingBand455ausLecture Notes in Economics and Mathematical Systems, Seite 140-150
In Caballero, R. and Ruiz, F. and Steuer, R.E., Editor
1997699.
Günther, Michael; Ostermann, Alexander
Numerical treatment of ordinary and algebra-differential equations
Preprint (1934)
1997
Herausgeber: Technische Hochschule Darmstadt698.
Schryber, Jeremy H.; Polyansky, Oleg L.; Jensen, Per; Tennyson, Jonathan
On the spectroscopically determined potential energy surfaces for the electronic ground states of NO\(_{2}\) and H\(_{2}\)O
Journal of Molecular Spectroscopy, 185 (2) :234-243
1997
Herausgeber: Academic Press697.
Schryber, Jeremy H.; Polyansky, Oleg L.; Jensen, Per; Tennyson, Jonathan
On the spectroscopically determined potential energy surfaces for the electronic ground states of NO\(_{2}\) and H\(_{2}\)O
Journal of Molecular Spectroscopy, 185 (2) :234-243
1997
Herausgeber: Academic Press696.
Schryber, Jeremy H.; Polyansky, Oleg L.; Jensen, Per; Tennyson, Jonathan
On the spectroscopically determined potential energy surfaces for the electronic ground states of NO2 and H2O
Journal of Molecular Spectroscopy, 185 (2) :234-243
1997
Herausgeber: Academic Press695.
Günther, M.; Hoschek, M.
ROW methods adapted to electric circuit simulation packages
Journal of Computational and Applied Mathematics, 82 (1) :159–170
1997
Herausgeber: Elsevier694.
Günther, Michael; Hoschek, Markus
ROW methods adapted to electric circuit simulation packages
Journal of computational and applied mathematics, 82 (1-2) :159--170
1997
Herausgeber: North-Holland693.
Tausch, Michael W.
Simulation von chemischen Gleichgewichten
Computer + Unterricht, 26 :35
1997692.
Bludsky, Ota; Jensen, Per
The calculation of the bound and quasibound vibrational states for ozone in its \(^{1}\)B\(_{2}\) electronic state
Molecular Physics, 91 (4) :653-662
1997691.
Bludsky, Ota; Jensen, Per
The calculation of the bound and quasibound vibrational states for ozone in its \(^{1}\)B\(_{2}\) electronic state
Molecular Physics, 91 (4) :653-662
1997690.
Bludsky, Ota; Jensen, Per
The calculation of the bound and quasibound vibrational states for ozone in its 1B2 electronic state
Molecular Physics, 91 (4) :653-662
1997689.
Kozin, Igor N.; Jensen, Per
The Effects of Nonzero Total Electron Spin in the X\verb=~= \(^{3}\)B\(_{1}\) State of Methylene CH\(_{2}\)
Journal of Molecular Spectroscopy, 183 (2) :398-406
1997
Herausgeber: Academic Press688.
Kozin, Igor N.; Jensen, Per
The Effects of Nonzero Total Electron Spin in the X\verb=~= \(^{3}\)B\(_{1}\) State of Methylene CH\(_{2}\)
Journal of Molecular Spectroscopy, 183 (2) :398-406
1997
Herausgeber: Academic Press687.
Kozin, Igor N.; Jensen, Per
The Effects of Nonzero Total Electron Spin in the X~ 3B1 State of Methylene CH2
Journal of Molecular Spectroscopy, 183 (2) :398-406
1997
Herausgeber: Academic Press686.
Klamroth, Kathrin; Mengersen, Ingrid
The Ramsey number r(K_1,3,C_4,K_4)
Utilitas Mathematica, 52 :65-81
1997
