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
603.
Gerstberger, R.; Günther, M.
Charge-oriented extrapolation methods in digital circuit simulation
Applied Numerical Mathematics, 18 (1) :115–125
1995
Herausgeber: Elsevier602.
Gerstberger, Robert; Günther, Michael
Charge-oriented extrapolation methods in digital circuit simulation
Applied numerical mathematics, 18 (1-3) :115--125
1995
Herausgeber: North-Holland601.
Flaud, Jean-Marie; Camy-Peyret, C.; B{ü}rger, H.; Jensen, Per; Kozin, Igor N.
Experimental evidence for the formation of fourfold rovibrational energy clusters in the \(\nu\)\(_{1}\)/\(\nu\)\(_{3}\) vibrational states of H\(_{2}\)\(^{80}\)Se
Journal of Molecular Spectroscopy, 172 (1) :126-134
1995
Herausgeber: Academic Press600.
Flaud, Jean-Marie; Camy-Peyret, C.; B{ü}rger, H.; Jensen, Per; Kozin, Igor N.
Experimental evidence for the formation of fourfold rovibrational energy clusters in the \(\nu\)\(_{1}\)/\(\nu\)\(_{3}\) vibrational states of H\(_{2}\)\(^{80}\)Se
Journal of Molecular Spectroscopy, 172 (1) :126-134
1995
Herausgeber: Academic Press599.
Flaud, Jean-Marie; Camy-Peyret, C.; Bürger, H.; Jensen, Per; Kozin, Igor N.
Experimental evidence for the formation of fourfold rovibrational energy clusters in the ν1/ν3 vibrational states of H280Se
Journal of Molecular Spectroscopy, 172 (1) :126-134
1995
Herausgeber: Academic Press598.
Heilmann, Margareta
Explicit Voronovskaja-type results for linear combinations of BDT-operators
Approximation Theory and its Applications, 11 (1) :54-61
1995597.
Ehrhardt, M.
Finite Differenzenverfahren für hyperbolische Systeme mit absorbierenden Randbedingungen
Technische Universität Berlin
1995596.
Jensen, Per; Li, Yan; Hirsch, Gerhard; Buenker, Robert J.; Lee, Timothy J.; Kozin, Igor N.
Fourfold clusters of rovibrational energies in H\(_{2}\)Te studied with an ab initio potential energy function
Chemical Physics, 190 (2-3) :179-189
1995595.
Jensen, Per; Li, Yan; Hirsch, Gerhard; Buenker, Robert J.; Lee, Timothy J.; Kozin, Igor N.
Fourfold clusters of rovibrational energies in H\(_{2}\)Te studied with an ab initio potential energy function
Chemical Physics, 190 (2-3) :179-189
1995594.
Jensen, Per; Li, Yan; Hirsch, Gerhard; Buenker, Robert J.; Lee, Timothy J.; Kozin, Igor N.
Fourfold clusters of rovibrational energies in H2Te studied with an ab initio potential energy function
Chemical Physics, 190 (2-3) :179-189
1995593.
Breidohr, R.; Shestakov, Oleg; Setzer, Klaus-Dieter; Fink, Ewald H.
High-Resolution Study of the a \(^{3}\)\(\Sigma\)\(^{+}\) (a\(_{1}\) 1) → X \(^{1}\)\(\Sigma\)\(^{+}\) (X 0\(^{+}\)) Transitions of BiP and BiAs
Journal of Molecular Spectroscopy, 172 (2) :369-377
1995
Herausgeber: Academic Press592.
Breidohr, R.; Shestakov, Oleg; Setzer, Klaus-Dieter; Fink, Ewald H.
High-Resolution Study of the a \(^{3}\)\(\Sigma\)\(^{+}\) (a\(_{1}\) 1) → X \(^{1}\)\(\Sigma\)\(^{+}\) (X 0\(^{+}\)) Transitions of BiP and BiAs
Journal of Molecular Spectroscopy, 172 (2) :369-377
1995
Herausgeber: Academic Press591.
Breidohr, R.; Shestakov, Oleg; Setzer, Klaus-Dieter; Fink, Ewald H.
High-Resolution Study of the a 3Σ+ (a1 1) → X 1Σ+ (X 0+) Transitions of BiP and BiAs
Journal of Molecular Spectroscopy, 172 (2) :369-377
1995
Herausgeber: Academic Press590.
Ziebarth, K.; Setzer, Klaus-Dieter; Fink, Ewald H.
High-Resolution Study of the X\(_{2}\) \(^{2}\)\(\Pi\)\(_{1/2}\) → X\(_{1}\) \(^{2}\)\(\Pi\)\(_{3/2}\) Fine-Structure Transitions of \(^{130}\)TeF and \(^{130}\)Te\(^{35}\)Cl
Journal of Molecular Spectroscopy, 173 (2) :488-498
1995
Herausgeber: Academic Press589.
Ziebarth, K.; Setzer, Klaus-Dieter; Fink, Ewald H.
High-Resolution Study of the X\(_{2}\) \(^{2}\)\(\Pi\)\(_{1/2}\) → X\(_{1}\) \(^{2}\)\(\Pi\)\(_{3/2}\) Fine-Structure Transitions of \(^{130}\)TeF and \(^{130}\)Te\(^{35}\)Cl
Journal of Molecular Spectroscopy, 173 (2) :488-498
1995
Herausgeber: Academic Press588.
Ziebarth, K.; Setzer, Klaus-Dieter; Fink, Ewald H.
High-Resolution Study of the X2 2Π1/2 → X1 2Π3/2 Fine-Structure Transitions of 130TeF and 130Te35Cl
Journal of Molecular Spectroscopy, 173 (2) :488-498
1995
Herausgeber: Academic Press587.
Günther, Michael; Denk, Georg; Feldmann, Uwe
How models for MOS transistors reflect charge distribution effects
Preprint (1745)
1995
Herausgeber: Technische Hochschule Darmstadt586.
Günther, Michael; Denk, Georg; Feldmann, Uwe
How models for MOS transistors reflect charge distribution effects
1995585.
Günther, Michael; Denk, Georg; Feldmann, Uwe
Impact of modeling and integration scheme on simulation of MOS-circuits
In Breitenecker, F. and Husinsky, I., Editor, Eurosim'95 Simulation Congress. Proceedings of the 1995 EUROSIM Conference, EUROSIM '95, Seite 385–390
In Breitenecker, F. and Husinsky, I., Editor
Herausgeber: Elsevier
1995584.
G\"unther, Michael; Denk, G.; Feldmann, U.
Impact of modeling and integration scheme on simulation of MOS-circuits
In F.~Breitenecker and I.~Husinsky., Editor, Eurosim'95 Simulation Congress, Seite 385--390
In F.~Breitenecker and I.~Husinsky., Editor
Herausgeber: Amsterdam, Elsevier
1995583.
Jacob, Birgit; Drăgan, Vasile; Pritchard, Anthony J.
Infinite-dimensional time-varying systems with nonlinear output feedback
Integral Equations Operator Theory, 22 (4) :440--462
1995582.
Becker, Karl Heinz; Kurtenbach, Ralf; Wiesen, Peter
Kinetic study of the NCO + C\(_{2}\)H\(_{4}\) reaction
Journal of Physical Chemistry, 99 (16) :5986-5991
1995581.
Becker, Karl Heinz; Kurtenbach, Ralf; Wiesen, Peter
Kinetic study of the NCO + C\(_{2}\)H\(_{4}\) reaction
Journal of Physical Chemistry, 99 (16) :5986-5991
1995580.
Becker, Karl Heinz; Kurtenbach, Ralf; Wiesen, Peter
Kinetic study of the NCO + C2H4 reaction
Journal of Physical Chemistry, 99 (16) :5986-5991
1995579.
G\"unther, Michael
Ladungsorientierte {Rosenbrock}-{Wanner}-Methoden zur numerischen Simulation digitaler Schaltungen
Band 20(168) aus Fortschritt-Berichte VDI
Herausgeber: VDI-Verlag D\"usseldorf
1995
