R. Escarela-Perez, E.A. Gutierrez-Rodriguez, J.C. Olivares-Galvan, M.S. Esparza-González, and E. Campero-Littlewood
Departamento de Energia, Universidad Autonoma Metropolitana - Azcapotzalco, Mexico D.F., Mexico
Instituto Tecnologico de Aguscalientes, Aguascalientes, Mexico
This work is concerned with the study of the asymmetrical phenomenon observed in three-phase transformers during the standard short-circuit test. The purpose of our work is to see if the asymmetric measurements can be predicted with the use of 2D finite-element models. To this end, we use the AC/DC Module of COMSOL Multiphysics. A multi-port network impedance is then determined to explain the ...
Modeling a 3D Eddy Current Problem Using the Weak Formulation of the Convective A-phi Steady State Method
University of North Carolina, Charlotte, North Carolina, USA
A 3D model of a magnetic rotor both rotating and translationally moving at high-speed over a conductive guideway is modeled in steady-state using the convective A*-Φ formulation. The presence of the magnetic rotor (source field) is incorporated into the formulation via the boundary conditions. This type of problem is difficult to model using existing commercial packaged electromagnetic ...
Massachusetts Institute of Technology, Cambridge, MA, USA
Markus Zahn received all his education at MIT, was a professor in the Department of Electrical Engineering at the University of Florida, Gainesville from 1970-1980, and then joined the MIT Department of Electrical Engineering and Computer Science faculty in 1980. He works in the Laboratory for Eelectromagnetic and Eelectronic Systems, in the MIT High Voltage Research Laboratory, is the Director ...
F. Grilli, A. Lucarelli, G. Lüpke, T. Haugan, and P. Barnes
Ecole Polytechnique de Montréal, Montréal, QC, Canada
College of William and Mary, Williamsburg, VA, USA
Air Force Research Laboratory
We have developed a model for computing current and field distributions in multifilamentary superconducting thin films subjected to the simultaneous effects of transport ac current and applied dc field perpendicular to the sample. The model is implemented in COMSOL’s PDE module (general form) and solves Maxwell equations using a highly non-linear resistivity to describe the superconductor ...
Capacitance Computation of Multilayered and Multiconductor Interconnects Using Finite Element Method
S. Musa, and M. Sadiku
College of Engineering, Prairie View A&M University, Prairie View, TX, USA
The development and analysis of interconnects in inhomogeneous structures such as very large scale integration chips, printed circuit boards, and multichip modules are essential for next-generation electronic products. In this paper, we illustrate fast and sufficiently accurate computation of capacitance matrices of multilayered and multiconductor interconnects applying the finite element ...
S. Barth, and S. Zimmermann
Drägerwerk AG & Co. KGaA, Lübeck, Germany
Ion mobility spectrometry provides fast detection of very low concentrations of chemical substances. Simple instrumentation combined with high sensitivity and high selectivity are the advantages of this technique. One well established field of application is the detection of hazardous compounds in air, such as chemical warfare agents, explosives and pollutants. A numerical model based on finite ...
Numerical Study of the Electrical Properties of Insulating Thin Films Deposited on a Conductive Substrate
R.A.Gerhardt, and S. Kumar
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
Parametric finite element simulations were performed to study the effect of film thickness, and electrode size on the different impedance parameters for insulating thin films deposited on a conductive substrate. COMSOL Multiphysics® was used to solve the quasi-static form of Maxwell’s electromagnetic equations in time harmonic mode. Several types of 2D models (linear and axisymmetric) ...
Development of an On-Line Wall-Fouling Sensor for Pipeline Transportation of Heavy Oil-Water Mixtures
S. Rushd, and R.S. Sanders
Chemical & Materials Engineering Department, University of Alberta, Edmonton, AB, Canada
A beneficial method for transporting highly viscous hydrocarbons (e.g. heavy oil and bitumen) through a pipeline is known as Lubricated Pipe Flow (LPF). A major challenge for this technology is flow instability caused by the formation of a wall-coating of oil or the thinning and/or loss of the lubricating water layer in the pipe. This issue can be addressed by using capacitance sensors to ...
H. Ghali, and A. Hossam
Electrical Engineering Department, British University in Egypt, Cairo, Egypt
Most probably Gauss\'s law is considered as the first \"electromagnetic\" concept for early undergraduate physics and electromagnetic courses. In early study year, teaching Gauss’s law is usually performed based on two main components; 1) The use of simple symmetrical charge distributions where a correct expectation of the spatial behavior of the electric flux density is possible and 2) The use ...
R. S. Wadhwa, T. Lien, and G. Monkman
NTNU Valgrinda, Inst. for produksjons- og kvalitetstek., Trondheim, Norway
FH Regensburg, Regensburg, Germany
The magnetic field gradient produced by an electromagnet gripper head depends on its design. Stochastic Methods offer certain robustness to the design optimization process. In this paper, Improved Discrete Particle Swarm Optimization (IDPSO) searching technique is applied to the shape and magnetic field gradient optimization of an electromagnet head. The magnetic field and forces are ...