COMPEL - The international journal for computation and mathematics in electrical and electronic engineering: Volume 28 Issue 4

Finite element analysis of linear boundary value problems with geometrical parameters

The purpose of this paper is to enable fast finite element (FE) analysis of electromagnetic structures with multiple geometric design variables.

Aberration coefficients in the optics of accelerator tubes

The purpose of this paper is to investigate the use of the finite element (FE) method in calculating accurate field gradients to achieve good estimates of aberration coefficients…

Asymptotic Fourier decomposition of tooth forces in terms of convolved air gap field harmonics for noise diagnosis of electrical machines

The electromagnetic excited audible noise of electrical machines can be mostly attributed to radial forces on stator tooth‐heads. The methodology proposed in this paper uses…

Physical modeling and numerical computation of magnetostriction

Magnetostrictive alloys are widely used in actuator and sensor applications. The purpose of this paper is to developed a realistic physical model and a numerical computational…

New operators for multi‐objective clonal selection algorithms

The purpose of this paper is to present a new multi‐objective clonal selection algorithm (MCSA) for the solution of electromagnetic optimization problems.

Characterization of a 3D defect using the expected improvement algorithm

The purpose of this paper is to provide a new methodology for the characterization of a defect by eddy‐current testing (ECT). The defect is embedded in a conductive non‐magnetic…

Real‐time reconstruction of endocardial potential maps in non‐contact cardiac mapping

The purpose of this paper is to describe a numerical inversion technology developed to reconstruct endocardial electric potential maps on the internal surface of heart chambers…

Logarithmic parameter reconstruction in electrical tomography

The purpose of this paper is to investigate the achievable improvement in reconstruction accuracy in electrical tomography through the incorporation of physical bound constraints…

Adaptive monotonicity method for permittivity imaging

The purpose of this paper is to demonstrate improvement of the accuracy of electrical tomography reconstruction by incorporation of a priori knowledge into the inverse problem…

Dimensional reduction of field problems in a differential‐forms framework

The purpose of this paper is to present a geometric approach to the problem of dimensional reduction. To derive (3 + 1) D formulations of 4D field problems in the relativistic…

Periodic boundary conditions in element free Galerkin method

The purpose of this paper is to introduce a new methodology to implement periodic and anti‐periodic boundary conditions in the element free Galerkin method (EFGM).

Enhanced homogenization technique for magnetomechanical systems using the generalized finite element method

The purpose of this paper is to present a homogenization approach to model mechanical structures with multiple scales and periodicity, as they occur, e.g. in power transformer…

Augmented reality in teaching of electrodynamics

The purpose of this paper is to present an application of augmented reality (AR) in the context of teaching of electrodynamics. The AR visualization technique is applied to…

Modelling eddy currents in thin shields

The purpose of this paper is to present a simplified rigorous mathematical formulation of the problem of electric currents induced in thin shields with holes yielding more…

Magnetic model refinement via a perturbation finite element method – from 1D to 3D

The purpose of this paper is to develop a sub‐domain perturbation technique for refining magnetic circuit models with finite element (FE) models of different dimensions.

Modelling earthing systems and cables with moment methods

The purpose of this paper is to present a method to model earthing systems subjected to lightning strikes with a one‐dimensional moment method. This paper was conducted because an…

A coupled electro‐chemical model of a direct methanol fuel cell for portable electronic devices

The purpose of this paper is to optimize the performance of direct methanol fuel cells for portable applications by combining a non‐linear, fully coupled circuit model and a…

Tolerance and multiobjective optimization in electromagnetic devices

The purpose of this paper is to develop a novel multi‐objective optimization algorithm which takes into account the uncertainty in design parameters by using a reduced resolution…

Extraction of DC busbar parasitics in PWM inverters

The purpose of this paper is to present and apply a parasitic extraction approach for the calculation of DC busbar inductances.

Plane elliptic or toroidal multipole expansions for static fields: Applications within the gap of straight and curved accelerator magnets

The purpose of this paper is to present new basis functions suitable to parameterize two‐dimensional static potentials or (magnetic) fields and to show their application in…

Optimal fixed‐point method for solving 3D nonlinear periodic eddy current problems

The purpose of the paper is to present a method for efficiently obtaining the steady‐state solution of the quasi‐static Maxwell's equations in case of nonlinear material…

Comparison between continuous and discrete frequency domain solution methods for structural steady state calculations with the finite element method

Different solution methods, using finite element method in continuous and discrete frequency domain, are compared with each other in order to find the most appropriate method for…

Discontinuous Galerkin formulation for eddy‐current problems

The purpose of this paper is to describe a method for solving eddy current problems. Discontinuous basis functions are applied to conducting regions in eddy‐current problems. This…

Extraction of circuit parameters from PCB by FDTD and SIBC

The purpose of this paper is to study the extraction of scattering parameters (SPs) from simple structures on a printed circuit board (PCB) by the finite difference time domain…

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