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
- 2000
967.
Garnica, R. M.; Appel, Matthew F.; Eagan, L.; McKeachie, J. Ryan; Benter, Thorsten
A REMPI method for the ultrasensitive detection of NO and NO2 using atmospheric pressure laser ionization mass spectrometry
Analytical Chemistry, 72 (22) :5639-5646
2000966.
Gu, Jian-ping; Hirsch, Gerhard; Buenker, Robert J.; Brumm, Martin; Osmann, Gerald; Bunker, Philip R.; Jensen, Per
A theoretical study of the absorption spectrum of singlet CH\(_{2}\)
Journal of Molecular Structure, 517-518 :247-264
2000965.
Gu, Jian-ping; Hirsch, Gerhard; Buenker, Robert J.; Brumm, Martin; Osmann, Gerald; Bunker, Philip R.; Jensen, Per
A theoretical study of the absorption spectrum of singlet CH\(_{2}\)
Journal of Molecular Structure, 517-518 :247-264
2000964.
Gu, Jian-ping; Hirsch, Gerhard; Buenker, Robert J.; Brumm, Martin; Osmann, Gerald; Bunker, Philip R.; Jensen, Per
A theoretical study of the absorption spectrum of singlet CH2
Journal of Molecular Structure, 517-518 :247-264
2000963.
Vander Auwera, J.; Kleffmann, Jörg; Flaud, Jean-Marie; Pawelke, G.; B{ü}rger, H.; Hurtmans, D.; P{é}trisse, R.
Absolute \(\nu\)\(_{2}\) Line Intensities of HOCl by Simultaneous Measurements in the Infrared with a Tunable Diode Laser and Far-Infrared Region Using a Fourier Transform Spectrometer
Journal of Molecular Spectroscopy, 204 (1) :36-47
2000
Herausgeber: Academic Press962.
Vander Auwera, J.; Kleffmann, Jörg; Flaud, Jean-Marie; Pawelke, G.; B{ü}rger, H.; Hurtmans, D.; P{é}trisse, R.
Absolute \(\nu\)\(_{2}\) Line Intensities of HOCl by Simultaneous Measurements in the Infrared with a Tunable Diode Laser and Far-Infrared Region Using a Fourier Transform Spectrometer
Journal of Molecular Spectroscopy, 204 (1) :36-47
2000
Herausgeber: Academic Press961.
Vander Auwera, J.; Kleffmann, Jörg; Flaud, Jean-Marie; Pawelke, G.; Bürger, H.; Hurtmans, D.; Pétrisse, R.
Absolute ν2 Line Intensities of HOCl by Simultaneous Measurements in the Infrared with a Tunable Diode Laser and Far-Infrared Region Using a Fourier Transform Spectrometer
Journal of Molecular Spectroscopy, 204 (1) :36-47
2000
Herausgeber: Academic Press960.
Jensen, Per
An introduction to the theory of local mode vibrations
Molecular Physics, 98 (17) :1253-1285
2000959.
Jensen, Per
An introduction to the theory of local mode vibrations
Molecular Physics, 98 (17) :1253-1285
2000958.
Jensen, Per
An introduction to the theory of local mode vibrations
Molecular Physics, 98 (17) :1253-1285
2000957.
Günther, Michael; Feldmann, Uwe
CAD based electric circuit modeling in industry. part I: Mathematical structure and index of network equations
2000956.
Becker, Karl Heinz; L{ö}rzer, Jutta C.; Kurtenbach, Ralf; Wiesen, Peter; Jensen, T. E.; Wallington, T. J.
Contribution of vehicle exhaust to the global N\(_{2}\)O budget
Chemosphere - Global Change Science, 2 (3-4) :387-395
2000955.
Becker, Karl Heinz; L{ö}rzer, Jutta C.; Kurtenbach, Ralf; Wiesen, Peter; Jensen, T. E.; Wallington, T. J.
Contribution of vehicle exhaust to the global N\(_{2}\)O budget
Chemosphere - Global Change Science, 2 (3-4) :387-395
2000954.
Becker, Karl Heinz; Lörzer, Jutta C.; Kurtenbach, Ralf; Wiesen, Peter; Jensen, T. E.; Wallington, T. J.
Contribution of vehicle exhaust to the global N2O budget
Chemosphere - Global Change Science, 2 (3-4) :387-395
2000953.
Jacob, Birgit
Corrections to: ``A sufficient condition for exact observability of spectral systems" [Kyungpook Math. J. \bf 35 (1996), no. 3, Special Issue, 427--434; MR1677625 (2000a:93019)] by S. K. Chang and S. M. Hwang
Kyungpook Math. J., 40 (2) :323--325
2000952.
Osmann, Gerald; Bunker, Philip R.; Kraemer, Wolfgang P.; Jensen, Per
Coulomb explosion imaging: The CH\(_{2}\)\(^{+}\), H\(_{2}\)O\(^{+}\) and NH\(_{2}\)\(^{+}\) ions as benchmarks
Chemical Physics Letters, 318 (6) :597-606
2000951.
Osmann, Gerald; Bunker, Philip R.; Kraemer, Wolfgang P.; Jensen, Per
Coulomb explosion imaging: The CH\(_{2}\)\(^{+}\), H\(_{2}\)O\(^{+}\) and NH\(_{2}\)\(^{+}\) ions as benchmarks
Chemical Physics Letters, 318 (6) :597-606
2000950.
Osmann, Gerald; Bunker, Philip R.; Kraemer, Wolfgang P.; Jensen, Per
Coulomb explosion imaging: The CH2+, H2O+ and NH2+ ions as benchmarks
Chemical Physics Letters, 318 (6) :597-606
2000949.
[german] Tausch, Michael W.; Korn, S.
Der Kohlenstoff-Kreislauf bei der Photosynthese und Atmung als Modellexperiment - Gekoppelte Reaktionszyklen
Praxis der Naturwissenschaften - Chemie in der Schule, 49 (7) :29
2000948.
Tausch, Michael W.
Didaktische Integration - die Versöhnung von Fachsystematik und Alltagsbezug
Chemie in der Schule, 47 (3) :179
2000947.
Günther, M.; Hoschek, M.; Rentrop, P.
Differential-algebraic equations in electric circuit simulation
International Journal of Electronics and Communication (AEÜ), 54 (2) :101–107
2000
Herausgeber: Elsevier946.
Klamroth, Kathrin; Wiecek, Margaret M.
Dynamic programming approaches to the multiple criteria knapsack problem
Naval Research Logistics, 47 :57-76
2000945.
[german] Tausch, Michael W.; Mascia, M.
Ein historisches Experiment 200 Jahre danach: Die Entdeckung der UV-Strahlen durch J. W. Ritter
Naturwissenschaften im Unterricht (Chemie), 57 (17) :117
2000944.
Setzer, Klaus-Dieter; Uibel, C.; Zyrnicki, W.; Pravilov, A. M.; Fink, Ewald H.; Liebermann, Heinz-Peter; Alekseyev, Aleksey B.; Buenker, Robert J.
Experimental and Theoretical Study of the Electronic States and Spectra of BiNa
Journal of Molecular Spectroscopy, 204 (2) :163-175
2000
Herausgeber: Academic Press943.
Setzer, Klaus-Dieter; Uibel, C.; Zyrnicki, W.; Pravilov, A. M.; Fink, Ewald H.; Liebermann, Heinz-Peter; Alekseyev, Aleksey B.; Buenker, Robert J.
Experimental and Theoretical Study of the Electronic States and Spectra of BiNa
Journal of Molecular Spectroscopy, 204 (2) :163-175
2000
Herausgeber: Academic Press
