COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 18 Issue 3
Table of contents
Noninvasive cardiac source imaging from potential and magnetic field data
Paul Wach, Gerald Fischer, Bernhard Tilg, Robert ModreVentricular surface activation time maps are estimated from simulated and measured body surface potential (BSP) maps and extra‐corporal magnetic field maps. In a first step the…
Approximation of the objective function: multiquadrics versus neural networks
Th. Ebner, Ch. Magele, B.R. Brandstätter, M. Luschin, P.G. AlottoGlobal optimization in electrical engineering using stochastic methods requires usually a large amount of CPU time to locate the optimum, if the objective function is calculated…
The optimisation of electromagnetic devices using a combined finite element/neural network approach with on‐line training
J. Seguin, F. Dandurand, D.A. Lowther, J.K. SykulskiThe paper presents a novel method of utilising neural networks for optimisation systems. First, a conventional magnetic circuit model of the device is developed to create a set of…
Identification of 1‐D magnetic field profiles in high current plasmas
Massimiliano de Magistris, Alessandro FormisanoThe identification of magnetic field profiles is crucial in many applications where a direct measurement is difficult. We discuss here a technique, based on the injection of…
The optimisation of electromagnetic devices using niching genetic algorithms
J.A. Gallardo, D.A. LowtherThe use of niching genetic algorithms can provide a method of a more widespread search of the design space for a device than more conventional methods. It provides, in effect, a…
Comparison of quasi minimal residual and bi‐conjugate gradient iterative methods to solve complex symmetric systems arising from time‐harmonic magnetic simulations
H. De Gersem, D. Lahaye, S. Vandewalle, K. HameyerFinite element discretizations of low‐frequency, time‐harmonic magnetic problems lead to sparse, complex symmetric systems of linear equations. The question arises which Krylov…
STEP standard’s evaluation for modeling in electromagnetism
Singva MaThe new set of standards ISO 10303 “STEP” makes it possible to give a complete representation of a product, using the description language EXPRESS. A part of STEP is devoted to…
On the Lorenz gauge
Alain BossavitAlthough edge elements satisfactorily solve the eddy current problem, formulations allowing the use of standard, node‐based elements, are still looked for. But “well‐posed”…
Some considerations about the perfectly matched layer for static fields
S. Alfonzetti, G. Borzì, N. SalernoThis paper discusses the perfectly matched layer method recently proposed for the computation of static or quasistatic fields in open boundaries. In particular it is shown how the…
BEM‐computation of antenna near field reactions on conducting materials using curvilinear edge elements
C.J. Huber, W. Rieger, A. Buchau, W.M. RuckerA boundary element method in terms of the field variables is applied to three‐dimensional electromagnetic scattering problems. Especially, the influence of a dipole excited field…
Computation of magnetostatic field using second order edge elements in 3D
Z. Ren, N. IdaSeveral second order edge elements have been applied to solving magnetostatic problems. The performances of these elements are compared through an example of magnetic circuit. In…
Image reconstruction from real scattering data
W. Rieger, A. Buchau, M. Haas, C. Huber, G. Lehner, W.M. RuckerThis paper deals with the inverse scattering problem of reconstructing the material properties of perfectly conducting or dielectric cylindrical objects. The material properties…
Dual formulations for the modeling of thin conducting magnetic shells
C. Geuzaine, P. Dular, W. LegrosTwo sets of dual magnetodynamic and magnetostatic finite element formulations taking thin conducting magnetic shells into account are proposed. The abstraction of the thin region…
Implementation of a hybrid method for eddy current problems
Jussi Kaisjoki, Kimmo Forsman, Aapo Koski, Lauri KettunenIn this paper, a hybrid formulation for solving time harmonic eddy current problems in terms of magnetic field h is considered. In particular, we discuss some properties of the…
Effective reluctivity calculation versus time step calculation of magnetic shielding with ferromagnetic material
Dieter Lederer, Hajime Igarashi, Arnulf Kost, Toshihisa HonmaThe calculation of magnetic shielding with ferromagnetic material by an effective reluctivity method and a time step method based on the finite element calculation is…
Non destructive evaluation in the time domain
R. Albanese, G. Rubinacci, A. Tamburrino, F. VilloneIn this paper a method is presented for an efficient solution of the direct problem (find the scattered field for a given thin crack and driving field) in the time domain. This is…
Numerical calibration of fluxset probe for quantitative eddy current testing
József Pávó, Antal GasparicsFluxset type eddy current probes are used for detecting discontinuities in conducting materials. The measurements obtained by such probes can be used for the reconstruction of the…
Computationally efficient rate dependent hysteresis model
János FüziA fast dynamic hysteresis model is constructed based on the classical Preisach model and a differential equation which delays its input with respect to the actual value to…
Anisotropic vector Preisach model and magnetic field solutions
Carlo Ragusa, Maurizio RepettoThe implementation of a vector Preisach model for the modelling of anisotropic hysteretic soft magnetic materials is outlined. Some comparisons with measurements on alternate and…
B‐H characteristic extraction using devices with non‐uniform field
Daniel Ioan, Mihai Rebican, Antal GasparicsThe paper describes an efficient method to extract the B‐H nonlinear characteristic from the experimental flux‐current Φ‐I data obtained using a non‐uniform magnetic field device…
Numerical simulation of induction hardening of steel
Jürgen Fuhrmann, Dietmar Hömberg, Manfred UhleWe discuss a model that is capable of describing the process of induction hardening of steel: induction heating – heat transfer – solid‐solid phase transitions in steel. It…
Estimation of 3‐D eddy currents in conducting laminations by an anisotropic conductivity and a 1‐D analytical model
Karl Hollaus, Oszkár BíróTo circumvent the high computational costs of modelling each lamination to compute the eddy current distribution in three dimensions in conducting laminations, a simple method has…
Numerical modelling of electrodynamic loudspeakers
M. Kaltenbacher, M. Rausch, H. Landes, R. LerchA new method for the numerical computation of the dynamic behaviour of electro‐dynamic loudspeakers is presented. The numerical scheme, based on the finite element method (FEM)…
Capacitive effect models for a magnetic field sensor
Daniel Ioan, Irina Munteanu, Corneliu PopeeaThe paper presents an efficient modeling technique for the fluxset magnetic field sensor. Using separate numerical solutions for the electric and magnetic fields, an equivalent…
Magnetic modelling and magneto‐hydro‐dynamic simulations of an aluminium production electrolytic cell
M. Chiampi, M. Repetto, V. Chechurin, A. Kalimov, L. LeboucherA simulation of the motion of molten aluminium inside an electrolytic cell is presented. Since the driving term of the aluminium motion is the Lorentz (j × B) body force acting…
ISSN:
0332-1649Online date, start – end:
1982Copyright Holder:
Emerald Publishing LimitedOpen Access:
hybridEditor:
- Prof Jan Sykulski