Conference Agenda
Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
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Session Overview |
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OC1: Static and quasi-static fields/ Wave propagation
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9:00am - 9:20am
ID: 467 / OC1: 1 Topics: Wave Propagation, Electromagnetic Compatibility, Mathematical Modelling and Formulations Keywords: electromagnetic compatibility, dipole extraction method, radiated emissions Evaluation of an Analytical Equivalent Hertzian Dipole Representation in TEM-Cells applying the Finite Element Method 1ams-OSRAM Group; 2Institute of Fundamentals and Theory in Electrical Engineeringg, Graz University of Technology For the metrological quantification of radiated emissions of integrated circuits, the two-port TEM-cell and IC-stripline methods are utilized. Analytical formulas have been developed in the past to use the TEM-cell measurement for an extraction of an equivalent analytical representation of the measured device under test. The equivalent sources are described as an array of electric and magnetic dipoles and can be used for e.g. open-area emission test simulations. This paper summarizes the theoretical background of this extraction methodology and gives an instruction for the needed measurements and calculations. Furthermore, the accuracy of the model is evaluated against full-wave finite element simulations and its portability to IC-stripline measurements is investigated.
9:20am - 9:40am
ID: 258 / OC1: 2 Topics: Static and Quasi-Static Fields, Mathematical Modelling and Formulations, Numerical Techniques, Novel Computational Methods for Machines and Devices Keywords: power cables, eddy currents, symmetry, dimension reduction, coordinate transformations, finite element modeling. Finite Element Modeling of Power Cables using Coordinate Transformations 1Technische Universität Berlin, Germany; 2University of Liège, Liège, Belgium Power cables have complex geometries in order to reduce their AC resistance. Although there are numerous different cable designs, most have in common that their inner conductors consist of several segments, which themselves consist of twisted strands. In previous works we presented how to reduce the dimension of eddy current boundary value problems for helicoidally conductors from 3D to 2D. The dimension reduction is based on a coordinate transformation from the Cartesian coordinate system to a helicoidal coordinate system. This contribution focuses on in-depth analyses of this approach and its extensions to more realistic power cable models.
9:40am - 10:00am
ID: 511 / OC1: 3 Topics: Static and Quasi-Static Fields, Mathematical Modelling and Formulations, Numerical Techniques, Multi-Physics and Coupled Problems Keywords: Finite element methods, reduced order model, nonlinear systems, nonuniform electric fields, power transformer PGD Based on Space-Time Separation for Nonlinear Electro-quasi-static Field 1Group of Electrical and Electronic Engineering of Paris, Sorbonne Université, CNRS, 75005 Paris, France; 2Group of Electrical and Electronic Engineering of Paris, Université Paris-Saclay, CentraleSupélec, CNRS, 91190 Paris, France; 3State Key Laboratory of Power Transmission Equipment and System Security and New Technology, 400044 Chongqing, China The quasi-static electric field analysis involving the nonlinear electric field-dependence of the conductivity consumes excessive computational resources. To decrease the degree of freedom, the reduced order modeling via the proper generalized decomposition (PGD) with space-time separation is employed. Also, the penalty function method is adopted in PGD to solve the boundary value problem. Finally, a converter transformer model is taken as an example to study the effect of electric field-dependent conductivity.
10:00am - 10:20am
ID: 279 / OC1: 4 Topics: Wave Propagation, Optimization and Design, Numerical Techniques Keywords: Reduced Basis, Eigenvalue Tracking, Cavities, Model Order Reduction Reduced Basis Approximation for Maxwell’s Eigenvalue Problem for Parameter-Dependent Domains Technische Universität Darmstadt, Germany In many high-frequency simulation workflows, eigenvalue tracking is necessary. This can become computationally prohibitive because repeated time-consuming eigenvalue problems must be solved. We employ a reduced basis approximation to bring down the computational costs. It is based on the greedy strategy from Horger et al. 2017 which considers multiple eigenvalues for elliptic eigenvalue problems. We extend this algorithm to deal with parameter-dependent domains and the Maxwell eigenvalue problem and apply it in an eigenvalue tracking application for an eigenmode classification.
10:20am - 10:40am
ID: 169 / OC1: 5 Topics: Wave Propagation, Mathematical Modelling and Formulations, Numerical Techniques Keywords: Cumulative distribution function, finite-difference time-domain method, multilevel Monte Carlo method, kernel density estimation Multilevel Monte Carlo FDTD Estimation of the Cumulative Distribution Function with Kernel Smoothing Technique 1Xi’an Jiaotong University Xi’an, China; 2Politecnico di Milano, Milan, Italy This paper addresses the multilevel Monte Carlo finite-difference time-domain (MLMC-FDTD) method for the estimation of the cumulative distribution function (CDF) of an electromagnetic quantity when material parameters in the problem are modeled as random variables. In order to alleviate the effects of the discontinuity of the indicator function, the kernel density estimation (KDE) technique is used. The technique can consider correlations between random parameters. It is shown that MLMC-FDTD has a faster convergence rate compared with Monte Carlo FDTD (MC-FDTD) and that the estimations of the CDF become smoother with the help of KDE. In addition, MLMC-FDTD preserves the advantages of MC-FDTD, such as robustness and simplicity, and proves to be a powerful approach, superior to other methods.
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