S. Majidnia, R. Nilavalan, J. Rudlin
Brunel University, London, United Kingdom
TWI ltd, Cambridge, United Kingdom
Conventional eddy current techniques have been used to a great extent for detection of surface breaking defects in conductive materials. However, detection of sub-surface defects is limited due to the single frequency and skin effect phenomena. Pulsed Eddy Current (PEC) techniques overcome these limitations. This work involves modelling of an encircling coil around a steel pipe with and without ...
M. Higginson-Rollins, C. Crawford
Department of Electrical & Computer Engineering, University of Kentucky, Lexington, KY, USA
Department of Physics & Astronomy, University of Kentucky, Lexington, KY, USA
The traditionally magnetic design process involves guessing at a reasonable conductor geometry, using finite element analysis (FEA) software to calculate the resulting fields, and modifying the configuration iteratively to reach an acceptable solution. Taking the opposite approach, we developed a method of calculating the conductor geometry as a function of the desired magnetic field. This method ...
Dr., ABB Corporate Research, Sweden
Outline of presentation: In electromagnetic technology applications the finite element method is very well suited for a wide range of problem types For many cases, in particular when inhomogeneous materials having complex properties are involved as well as when multiphysics couplings are essential, it is the only option available The somewhat unfavourable performance scaling with problem ...
FEMLAB Simulation von Hohlkathodenentladungen zur Erzeugung von extrem ultravioletter (EUV) Strahlung
Wieneke, S., Kromer, J., Ach, F., Viöl, W.
Hochschule für angewandte Wissenschaft und Kunst, Fakultät Naturwissenschaften und Technik, Göttingen
Für intensive Strahlungsquellen im Spektralbereich von Vakuumultraviolett (VUV, 10 -200 nm) über extremes Ultraviolett (XUV, 1 – 10 nm) bis in den Bereich der weichen Röntgenstrahlung (SXR, 0,1 – 1 nm) (siehe Abbildung 1) besteht in Forschung und Industrie ein hoher Bedarf, der in der Zukunft noch deutlich wachsen wird. Insbesondere im Bereich der Röntgenlithographie zur Herstellung von ...
Teknova AS, Kristiansand, Norway
COMSOL Multiphysics has been applied to develop a model for inductive heating. A coarse, lumped model of the interior of a high temperature reactor is coupled to finite element models for the electromagnetic field, the temperature distribution outside the reactor, and mechanical stresses in the crucible. The model can be applied to study operational conditions, thermal stresses, or design details ...
C. Horch, S. Schlayer, and F. Stallmach
Faculty of Physics and Earth Sciences, University of Leipzig, Leipzig, Germany
For low-field NMR (Nuclear magnetic resonance), NdFeB permanent magnet arrangements are proposed to provide the static polarizing magnetic field. Especially a parallel and a circular arrangement of the permanent magnets, iron yokes and small shim magnets were tested and improved by COMSOL. The intent was to guide the design and the construction of NMR magnets by calculating the magnetic field ...
Fast Computation of Capacitance Matrix and Potential Distribution for Multiconductor in Non-Homogenous Multilayered Dielectric Media
S.M. Musa, and M.N.O. Sadiku
Prairie View A&M University Networking Academy, Prairie View, Texas, USA
This paper presents the fast computational and modeling of multiconductor transmission lines interconnect in non-homogenous multilayered dielectric media using the finite element method (FEM). We illustrate the potential distribution of the multiconductor transmission lines for the models and their solution time. We compared some of our results of computing the capacitance matrix with method of ...
T. Müller1, A. Schwenger2, and H. Haase1
1Institut für Grundlagen der Elektrotechnik und Messtechnik, Leibniz Universität Hannover, Hannover, Germany
2Volkswagen AG, Hannover, Germany
This paper describes the determination of the electric characteristics of an electromagnetic actuator with respect to a required time dependent displacement. The model used here analyzes an actuator with a permanent magnet rotor; a nonlinear iron magnetization curve is considered. The result is the force of the actuator depending on ampere-turns and displacement. Additionally, the flux linkage to ...
3-D Modeling of a Differential Impedance Obstacle Detection Sensor for Horizontal Directional Drilling Operations
J. N. Shah1, A. Jaganathan1, E. N. Allouche1, M. Kieba2, and C. J. Ziolkowski2
1Louisiana Tech University, Ruston, LA, USA
2Gas Technology Institute, Chicago, IL, USA
Horizontal Directional Drilling (HDD) is a commonly used technology for the installation of pipelines, conduits and cables in urban areas and across obstacles such as rivers, railways and freeways. A main concern in using the HDD method is the risk of hitting existing buried utilities during the boring process. The Differential Impedance Obstacle Detection (DIOD), developed by the Gas Technology ...
F. Dewarrat, L. Falco, A. Caduff, and M. Talary
Solianis Monitoring AG, Zürich, Switzerland
Impedance spectroscopy is a measurement technique that has been investigated in a wide variety of medical applications. An example is the measurement of the dielectric properties of the skin and underlying tissue using sensors placed in contact with human skin with capacitive fringing field electrodes. The aim of this work is to use finite element methods for optimizing the sensor design to ...