Zeller, P.1, Rabl, M.2
1 FH-Wels, Studiengangsleiter Automatisierungstechnik
2 FH-Wels, Studiengangsleiter Innovations- und Produktmanagement
Moderne Überspannungsableiter bestehen aus einer halbleitenden Zinkoxidkeramik, die auf-grund ihrer nichtlinearen elektrischen Charakteristik ein spannungsbegrenzendes Verhalten zeigt. Aufgrund des negativen Temperaturkoeffizienten des Sperrstromes, kann es zu einem „thermischen Davonlaufen“ nach einem zu hohen Energieeintrag bei einem Ableitvorgang kommen. Die Belastbarkeitsgrenze muss ...
Calculation of the Magnetic Field Intensity in a Rectangular Conductor Carrying Current in Electromagnetism Introductory Courses
J.C. Olivares-Galvan, I. Hernandez , P.S. Georgilakis, and L.E. Campero
Universidad Autónoma Metropolitana, Azcapotzalco, Mexico, D.F.
Centro de Investigacion y de Estudios Avanzados del IPN, Unidad Guadalajara, Guadalajara, Jalisco, Mexico
School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece
This paper describes a type of didactic material used when teaching electromagnetism. The purpose is to guide the students to verify the results of a Finite Element (FE) simulation using those obtained analytically. This procedure has shown to be of great help during their learning of the FE method. The example in this paper uses a 2D analytical method to estimate the magnetic field generated by ...
T.A. Jankowski, D.P. Johnson, J.D. Jurney, J.E. Freer, L.M. Dougherty, and S.A. Stout
Los Alamos National Laboratory, Los Alamos, New Mexico, USA
The induction heating coils used in the plutonium casting furnaces at the Los Alamos National Laboratory are studied here. A cylindrical graphite test article has been built, instrumented with thermocouples, and heated in the induction coil that is normally used to preheat the molds during casting operations. The experiments have been modeled in COMSOL Multiphysics and the numerical and ...
H. Lorenzen, J. Timmerberg, and S. Mylvaganam
Department of Electrical Engineering, UAS OOW, Wilhelmshaven, Germany
Department Technology/Engineering, Telemark University College, Porsgrunn, Norway
Efforts involving simulation of transmission line networks necessitate the accurate values of the parameters of the lines. In this paper, as an attempt in estimating such parameters, the parameters of high voltage asymmetric power lines are calculated. In the process of estimation, the three phase equivalent circuit model is used. The resistance and inductance of such lines are dependent on ...
S. Musa and M. Sadiku
College of Engineering, Prairie View A&M University, Prairie View, TX, USA
Due to the complexity of electromagnetic modeling, researchers and scientists always look for development of accurate and fast methods to extract the parameters of electronic interconnects and package structures. In this paper, we illustrate modeling of multiconductor interconnects in multilayered dielectric media using COMSOL Multiphysics and the finite element method. We specifically determine ...
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 measure ...
Verification and Time Performance Analysis of COMSOL v3.5a for Solving the Electromagnetic Problem in a Superconductor Slab
J. Lloberas, J. López, E. Bartolomé, and X. Granados
Universitat Politècnica de Catalunya, Barcelona, Spain
Escola Universitària Salesiana de Sarrià, Barcelona, Spain
Institut de Ciència de Materials de Barcelona, Barcelona, Spain
Numerical analysis based on finite element method (FEM) represents a powerful approach to solve electromagnetic problems. For instance, FEM methods have been broadly used to calculate the critical state current distribution in high temperature superconductors of various geometries. In the near future, we intend to develop a tool in COMSOL v3.5a for the analysis of power applications, such as ...
Y. He, R. Nilssen
Department of Electric Power Engineering, Norwegian University of Science and Technology, Trondheim, Norway
Ferrofluids have been successfully used in the seals for rotary shafts, but few studies focus on the reciprocating motion seals. Since the completely different operational regimes, previous experiences on the rotary motions could not be directly applied on the cases for reciprocating shafts. In this study, we present a simplified model to describe the process that a shaft linearly moving in a ...
S. C. Hegde
VIT University, Vellore, Tamil Nadu, India
The coaxial cable is one of the most commonly used bandwidth limited signal transmission line.Dispersion is a signal distortion phenomenon which arises due to frequency dependence of phase velocity of signal components. This phenomenon was explained through time domain approach by studying time taken by signals of various frequencies to propagate through the cable, which eventually may cause ...
Design of Three Phase Homopolar Synchrone Reluctance Machine with Double Statoric Winding and Double Massive Rotor
C. Belalahy, I. Rasoanarivo, S. Rael, and F. M. Sargos
GREEN Institut National Polytechnique de Lorraine, Vandoeuvre lès Nancy, France
This paper deals with the design of a three phase synchronous reluctance machine constituted by two stators and two massive rotors. A coil is placed in the stator, between the two salient poles of the rotor. These poles can have parallel or perpendicular axes. Such structures allow the rotor to work as an inertial load and provide high dynamic performances with regards to energy conversion, a ...