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Computational electromagnetics

About: Computational electromagnetics is a research topic. Over the lifetime, 6412 publications have been published within this topic receiving 113727 citations. The topic is also known as: Electromagnetic field analysis.


Papers
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Journal ArticleDOI
TL;DR: A general model to compute the response of an electromagnetic induction sensor to a magnetic soil, in both time and frequency domains, is developed and, for most soils of relevance to mine clearance, the corresponding error is negligible.
Abstract: A general model to compute the response of an electromagnetic induction sensor to a magnetic soil, in both time and frequency domains, is developed. The model requires modest computational resources and can be applied to arbitrary soil inhomogeneities and relief, and to arbitrary sensor coil shapes, orientations, and positions. Central to the model is the concept of a head sensitivity map, which can be used to characterize the sensor head as a function of the shape, size, and position of the sensor coils. Two further concepts related to the head sensitivity are presented, which are the zero equisensitivity surface and the volume of influence. We demonstrate that these concepts aid the understanding of the detector behavior. The general model is based on the Born approximation, which is valid if the soil magnetic susceptibility is sufficiently small. A simpler model, which is only valid for homogeneous half-space soils but does not require the Born approximation, is also developed. The responses predicted by both models are shown to be in good agreement with each other and also with available analytic solutions. Comparing the two models also enabled an expression for the error incurred when using the Born approximation to be established. We shown that, for most soils of relevance to mine clearance, the corresponding error is negligible.

27 citations

06 Oct 2003
TL;DR: In this article, an analytical model of the electromagnetic forming process performed for shaping of hollow circular cylindrical objects, has been developed, which applies both for electromagnetic compression and expansion of hollow circle cylinders, and also for expansion for steel beverage cans, which was used for verification of the various aspects of the developed analytical model.
Abstract: The behaviour of matter in an electromagnetic field may be considered as a very complex problem, involving not only electromagnetism but also mechanics and thermodynamics. The interaction field-matter is not simple even for a rigid body, and it becomes more complicated for a deforming body, as long as all the physical quantities that characterize the process are changing both in time and space and also in their interdependence. It is well known that conducting bodies can move and/or can be deformed when they are subjected to strong electromagnetic fields. One of the practical applications of these phenomena is the electromagnetic forming, i.e. shaping objects using strong electromagnetic fields. The electromagnetic forming is a high-velocity forming procedure and it has many advantages that make it an attractive alternative to conventional forming systems or even to other high-velocity forming systems. Since the early 20-th century this has been used at an industrial level, though without a well developed theory about all the phenomena involved in the process. In this thesis, an analytical model of the electromagnetic forming process performed for shaping of hollow circular cylindrical objects, has been developed. The model applies both for electromagnetic compression and expansion of hollow circular cylindrical objects. Additionally, for expansion, an experimental model has been developed to design a set-up for an experimental investigation of electromagnetic forming of steel beverage cans, which was used for verification of the various aspects of the developed analytical model.

27 citations

Proceedings ArticleDOI
13 Feb 2009
TL;DR: In this article, a model based on equivalent sources obtained from near-field measurements has been developed, and the aim of this model is to insert this model into commercial electromagnetic tools such as HFSS to make it helpful for engineers.
Abstract: To evaluate magnetic fields radiated by electronic components, different radiated emission models have been created Within IRSEEM, a model based on equivalent sources obtained from near-field measurements has been developed The aim of our study is to insert this model into commercial electromagnetic tools such as HFSS to make it helpful for engineers

27 citations

Book
19 Nov 2015
TL;DR: In this paper, the authors provide an essential introduction to the use of high-order basis functions for high-frequency electromagnetics, including antennas, microwave devices and radar scattering applications.
Abstract: Improvements in the accuracy, computational cost, and reliability of computational techniques for high-frequency electromagnetics (including antennas, microwave devices and radar scattering applications) can be achieved through the use of 'high-order' techniques. This book outlines these techniques by presenting high-order basis functions, explaining their use, and illustrating their performance. The specific basis functions under consideration were developed by the authors, and include scalar and vector functions for use with equations such as the vector Helmholtz equation and the electric field integral equation. The book starts by considering the approximation of scalar functions, and explores the error in some of those representations. Singular functions (those that are unbounded) are also considered, since these often arise in practical EM problems. The authors then discuss the approximation of vector functions, and summarize the various classes of vector basis functions that have been used by the professional community. Following this, they present higher-order basis functions for the most common cell shapes used in finite element analysis procedures. Finally, they consider some of the implementation details associated with the use of these functions for integral equation/method of moments formulations and differential equation/finite element method approaches. This book provides an essential introduction to these techniques for researchers, graduate students and practicing professionals in the discipline of computational electromagnetics.

27 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202325
2022101
2021153
202091
2019109
2018107