25 citations · 195 across the 36 of their papers we have counts for
36 papers
The CREATOR Project: Towards a Computational Electric Machine Laboratory
Sebastian Schöps, Annette Muetze, Herbert De Gersem +3
The Collaborative Research Centre TRR 361/F90 CREATOR (2022-2030) aims at establishing a new paradigm for the simulation-driven design of electric machines. Increasing demands on e…
Periodic Adjoint Sensitivity Analysis
Julian Sarpe, Andreas Klaedtke, Herbert De Gersem
This paper proposes the utilization of a periodic Parareal with a periodic coarse problem to efficiently perform adjoint sensitivity analysis for the steady state of time-periodic…
Transient Nonlinear Electrothermal Adjoint Sensitivity Analysis for HVDC Cable Joints
M. Greta Ruppert, Yvonne Späck-Leigsnering, Herbert De Gersem
Efficient computation of sensitivities is a promising approach for efficiently of designing and optimizing high voltage direct current cable joints. This paper presents the adjoint…
Transient Forward Harmonic Adjoint Sensitivity Analysis
Julian Sarpe, Andreas Klaedtke, Herbert De Gersem
This paper presents a transient forward harmonic adjoint sensitivity analysis (TFHA), which is a combination of a transient forward circuit analysis with a harmonic balance based a…
Considering Capacitive Effects in Foil Winding Homogenization
Jonas Bundschuh, Yvonne Späck-Leigsnering, Herbert De Gersem
In conventional finite element simulations, foil windings with a thin foil and many turns require many mesh elements. This renders models quickly computationally infeasible. With t…
Reformulation and generalisation of the air-gap element
Herbert De Gersem, Thomas Weiland
The air-gap macro element is reformulated such that rotation, rotor or stator skewing and rotor eccentricity can be incorporated easily. The air-gap element is evaluated using Fast…
Homogenization of Foil Windings with Globally Supported Polynomial Shape Functions
Jonas Bundschuh, Yvonne Späck-Leigsnering, Herbert De Gersem
In conventional finite element simulations, foil windings with thin foils and with a large number of turns require many mesh elements. This renders models quickly computationally i…
Multivariate sensitivity-adaptive polynomial chaos expansion for high-dimensional surrogate modeling and uncertainty quantification
Dimitrios Loukrezis, Eric Diehl, Herbert De Gersem
This work develops a novel basis-adaptive method for constructing anisotropic polynomial chaos expansions of multidimensional (vector-valued, multi-output) model responses. The ada…
Efficient Reduced Magnetic Vector Potential Formulation for the Magnetic Field Simulation of Accelerator Magnets
Laura A. M. D'Angelo, Dominik Moll, Andrea Vitrano +5
The major advantage of reduced magnetic vector potential formulations (RMVPs) is that complicated coil structures do not need to be resolved by a computational mesh. Instead, they…
Error Approximation and Bias Correction in Dynamic Problems using a Recurrent Neural Network/Finite Element Hybrid Model
Moritz von Tresckow, Herbert De Gersem, Dimitrios Loukrezis
This work proposes a hybrid modeling framework based on recurrent neural networks (RNNs) and the finite element (FE) method to approximate model discrepancies in time dependent, mu…
A Stabilized Circuit-Consistent Foil Conductor Model
Elias Paakkunainen, Jonas Bundschuh, Idoia Cortes Garcia +2
The magnetoquasistatic simulation of large power converters, in particular transformers, requires efficient models for their foils windings by means of homogenization techniques. I…
Data-driven Modified Nodal Analysis Circuit Solver
Armin Galetzka, Dimitrios Loukrezis, Herbert De Gersem
This work introduces a novel data-driven modified nodal analysis (MNA) circuit solver. The solver is capable of handling circuit problems featuring elements for which solely measur…
Low-Frequency Stabilization of Dielectric Simulation Problems with Conductors and Insulators
Devin Balian, Melina Merkel, Jörg Ostrowski +2
When simulating resistive-capacitive circuits or electroquasistatic problems where conductors and insulators coexist, one observes that large time steps or low frequencies lead to…
Quadrupole Magnet Design based on Genetic Multi-Objective Optimization
Eric Diehl, Moritz von Tresckow, Lou Scholtissek +4
This work suggests to optimize the geometry of a quadrupole magnet by means of a genetic algorithm adapted to solve multi-objective optimization problems. To that end, a non-domina…
Adjoint Variable Method for Transient Nonlinear Electroquasistatic Problems
M. Greta Ruppert, Yvonne Späck-Leigsnering, Julian Buschbaum +1
Many optimization problems in electrical engineering consider a large number of design parameters. A sensitivity analysis identifies the design parameters with the strongest influe…
An -adaptive multi-element stochastic collocation method for surrogate modeling with information re-use
Armin Galetzka, Dimitrios Loukrezis, Niklas Georg +2
This paper introduces an -adaptive multi-element stochastic collocation method, which additionally allows to re-use existing model evaluations during either - or -refinem…
Power Module Heat Sink Design Optimization with Ensembles of Data-Driven Polynomial Chaos Surrogate Models
Dimitrios Loukrezis, Herbert De Gersem
We consider the problem of optimizing the design of a heat sink used for cooling an insulated gate bipolar transistor (IGBT) power module. The thermal behavior of the heat sink is…
Transmission operators for the non-overlapping Schwarz method for solving Helmholtz problems in rectangular cavities
Nicolas Marsic, Christophe Geuzaine, Herbert De Gersem
In this paper we discuss different transmission operators for the non-overlapping Schwarz method which are suited for solving the time-harmonic Helmholtz equation in cavities (i.e.…
Tensor train based isogeometric analysis for PDE approximation on parameter dependent geometries
Ion Gabriel Ion, Dimitrios Loukrezis, Herbert De Gersem
This work develops a numerical solver based on the combination of isogeometric analysis (IGA) and the tensor train (TT) decomposition for the approximation of partial differential…
Capacitance calculation of unloaded rolling elements -- Comparison of analytical and numerical methods
Steffen Puchtler, Tobias Schirra, Eckhard Kirchner +2
Various methods for calculating the capacitance of unloaded rolling elements are compared to improve the electric characterization of rolling element bearings. Semi-analytical appr…
A Neural Solver for Variational Problems on CAD Geometries with Application to Electric Machine Simulation
Moritz von Tresckow, Stefan Kurz, Herbert De Gersem +1
This work presents a deep learning-based framework for the solution of partial differential equations on complex computational domains described with computer-aided design tools. T…
Three-Dimensional Data-Driven Magnetostatic Field Computation using Real-World Measurement Data
Armin Galetzka, Dimitrios Loukrezis, Herbert De Gersem
This paper presents a practical case study of a data-driven magnetostatic finite element solver applied to a real-world three-dimensional problem. Instead of using a hard-coded phe…
Broadband Finite-Element Impedance Computation for Parasitic Extraction
Jonathan Stysch, Andreas Klaedtke, Herbert De Gersem
Parasitic extraction is a powerful tool in the design process of electromechanical devices, specifically as part of workflows that check electromagnetic compatibility. A novel sche…
Quasi-3D Thermal Simulation of Quench Propagation in Superconducting Magnets
Laura A. M. D'Angelo, Jonas Christ, Herbert De Gersem
To deal with the multi-scale nature of the quench propagation problem in superconducting magnets, this work presents a quasi-three-dimensional (Q3D) approach combining a two-dimens…