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
- 2018
3942.
Frommer, Andreas; Schimmel, Claudia; Schweitzer, Marcel
Bounds for the decay of the entries in inverses and Cauchy-Stieltjes functions of certain sparse, normal matrices
Numer. Linear Algebra Appl., 25 (4) :e2131, 17
20183941.
Frommer, Andreas; Schimmel, Claudia; Schweitzer, Marcel
Bounds for the decay of the entries in inverses and Cauchy-Stieltjes functions of certain sparse, normal matrices
Numer. Linear Algebra Appl., 25 (4) :e2131, 17
20183940.
Frommer, Andreas; Schimmel, Claudia; Schweitzer, Marcel
Bounds for the decay of the entries in inverses and Cauchy-Stieltjes functions of certain sparse, normal matrices
Numer. Linear Algebra Appl., 25 (4) :e2131, 17
20183939.
Heilmann, Margareta; Raşa, Ioan
C0-semigroups associated with uniquely ergodic Kantorovich modifications of operators
Positivity, 22 :829-835
20183938.
[german] Spinnen, Sebastian; Tausch, Michael W.
Chem4Digit - Chemie für digitale Logik
CHEMKON, 25 (2) :69--73
2018
Herausgeber: Wiley3937.
Meuter, Nico
Chemie 2 Berlin/Brandenburg, Gefährdungsbeurteilungen 2
In Claudia Bohrmann-Linde and Simone Krees and I. Siehr, Editor
Herausgeber: C. C. Buchner
20183936.
[german] Meuter, Nico
Chemie Baden-Württemberg LB 1 mit GFB
In Claudia Bohrmann-Linde and Jochen Krüger and Klaus Schneiderhan, Editor
Kapitel Gef{\~A}¤hrdungsbeurteilungen
Herausgeber: C. C. Buchner
20183935.
Bohrmann-Linde, Claudia; Kleefeldt, Simon
Chemische Reaktionen mit der Wärmebildkamera betrachtet
Nachrichten aus der Chemie, 66 (12) :1182-1185
2018
Herausgeber: Wiley3934.
Kleffmann, Jörg
Comment on ''Wavelength-Resolved Photon Fluxes of Indoor Light Sources: Implications for HO\(_{x}\) Production''
Environmental Science \& Technology, 52 (18) :11964-11965
20183933.
Kleffmann, Jörg
Comment on ''Wavelength-Resolved Photon Fluxes of Indoor Light Sources: Implications for HO\(_{x}\) Production''
Environmental Science \& Technology, 52 (18) :11964-11965
20183932.
Kleffmann, Jörg
Comment on "Wavelength-Resolved Photon Fluxes of Indoor Light Sources: Implications for HOx Production"
Environmental Science & Technology, 52 (18) :11964-11965
20183931.
Kreidler, Henrik
Compact operator semigroups applied to dynamical systems
Semigroup Forum, 97 (3) :523--547
20183930.
Heilmann, Margareta; Nasaireh, Fadel; Raşa, Ioan
Complements to Voronovskaja's formula
Mathematics and Computing - ICMC 2018,Band Springer Proceedings in Mathematics and Computing, Seite 127-134
ICMC 2018
Varanasi, India
January 9-11, 2018
In Debdas Ghosh, Debasis Giri, Ram N. Mohapatra, Kouichi Sakurai, Ekrem Savas and Tanmoy Som, Editor
Herausgeber: Springer
20183929.
Hirano, Tsuneo; Nagashima, Umpei; Jensen, Per
Computational molecular spectroscopy of X\verb=~=\(^{2}\)\(\Pi\) NCS: Electronic properties and ro-vibrationally averaged structure
Journal of Molecular Spectroscopy, 346 :4-12
2018
Herausgeber: Academic Press3928.
Hirano, Tsuneo; Nagashima, Umpei; Jensen, Per
Computational molecular spectroscopy of X\verb=~=\(^{2}\)\(\Pi\) NCS: Electronic properties and ro-vibrationally averaged structure
Journal of Molecular Spectroscopy, 346 :4-12
2018
Herausgeber: Academic Press3927.
Hirano, Tsuneo; Nagashima, Umpei; Jensen, Per
Computational molecular spectroscopy of X~2Π NCS: Electronic properties and ro-vibrationally averaged structure
Journal of Molecular Spectroscopy, 346 :4-12
2018
Herausgeber: Academic Press3926.
Freund, Jens; Galleguillos Kempf, Sarah C.; Jensen, Per; Nagashima, Umpei; Hirano, Tsuneo
Computational spectroscopy of NCS in the Renner-degenerate electronic state X\verb=~=\(^{2}\)\(\Pi\)
Journal of Molecular Spectroscopy, 345 :31-38
2018
Herausgeber: Academic Press3925.
Freund, Jens; Galleguillos Kempf, Sarah C.; Jensen, Per; Nagashima, Umpei; Hirano, Tsuneo
Computational spectroscopy of NCS in the Renner-degenerate electronic state X\verb=~=\(^{2}\)\(\Pi\)
Journal of Molecular Spectroscopy, 345 :31-38
2018
Herausgeber: Academic Press3924.
Freund, Jens; Galleguillos Kempf, Sarah C.; Jensen, Per; Nagashima, Umpei; Hirano, Tsuneo
Computational spectroscopy of NCS in the Renner-degenerate electronic state X~2Π
Journal of Molecular Spectroscopy, 345 :31-38
2018
Herausgeber: Academic Press3923.
Metzger, Jutta; Nied, Manuela; Corsmeier, Ulrich; Kleffmann, Jörg; Kottmeier, Christoph
Dead Sea evaporation by eddy covariance measurements vs. aerodynamic, energy budget, Priestley-Taylor, and Penman estimates
Hydrology and Earth System Sciences, 22 (2) :1135-1155
20183922.
Metzger, Jutta; Nied, Manuela; Corsmeier, Ulrich; Kleffmann, Jörg; Kottmeier, Christoph
Dead Sea evaporation by eddy covariance measurements vs. aerodynamic, energy budget, Priestley-Taylor, and Penman estimates
Hydrology and Earth System Sciences, 22 (2) :1135-1155
20183921.
Metzger, Jutta; Nied, Manuela; Corsmeier, Ulrich; Kleffmann, Jörg; Kottmeier, Christoph
Dead Sea evaporation by eddy covariance measurements vs. aerodynamic, energy budget, Priestley-Taylor, and Penman estimates
Hydrology and Earth System Sciences, 22 (2) :1135-1155
20183920.
Gausling, Kai; Bartel, Andreas
Density Estimation Techniques in Cosimulation Using Spectral- and Kernel Methods
In Langer, U. and Amrhein, W. and Zulehner, W., Editor, Scientific Computing in Electrical Engineering: SCEE 2016, St. Wolfgang, Austria, October 2016Band28, Seite 81--89
Springer International Publishing
In Langer, U. and Amrhein, W. and Zulehner, W., Editor
Herausgeber: Springer
20183919.
Gausling, Kai; Bartel, Andreas
Density estimation techniques in cosimulation using Spectral-and Kernel methods
In Langer, Ulrich and Amrhein, Wolfgang and Zulehner, Walter, Editor, Scientific Computing in Electrical Engineering: SCEE 2016, St. Wolfgang, Austria, October 2016ausMathematics in Industry, Seite 81–89
In Langer, Ulrich and Amrhein, Wolfgang and Zulehner, Walter, Editor
Herausgeber: Springer Cham
20183918.
Calore, Enrico; Gabbana, Alessandro
Design and optimizations of lattice Boltzmann methods for massively parallel GPU-based blusters
Seite 54–114
Herausgeber: IGI Global
2018
54–114
