Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abramgem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

Modeling a 3D Eddy Current Problem Using the Weak Formulation of the Convective A-phi Steady State Method

J. Bird[1]

[1]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 ...

Dynamic Simulation of Electromagnets

Harald Biller
Dr.
Continental Automotive Systems, Frankfurt, Germany

Harald Biller studied mathematics and physics at Darmstadt, London, and Würzburg. In 1999, he received his PhD from Stuttgart University, specializing in functional analysis, topology, and Lie theory. He worked as a lecturer at Darmstadt University until 2004, when he became a development engineer with the automotive supplier Continental, one of the leading producers of electronic brake and ...

Going beyond Axisymmetry: 2.5D Vector Electromagnetics

Y.A. Urzhumov[1][,][2], N.I. Landy[1][,][2], C. Ciraci[2], D.R. Smith[1][,][2]
[1]Department of Electrical and Computer Engineering, Pratt School of Engineering, Duke University, Durham, NC, USA
[2]Center for Metamaterials and Integrated Plasmonics, Pratt School of Engineering, Duke University, Durham, NC, USA

Linear wave propagation through inhomogeneous structures of size R?? (Fig.1) is a computationally challenging problem, in particular when using finite element methods, due to the steep increase of the number of degrees of freedom as a function of R/?. Fortunately, when the geometry of the problem possesses symmetries, one may choose an appropriate basis in which the stiffness matrix of the ...

Finite Element Modeling of Pulsed Eddy Current Applied to Ferrous and Titanium Fasteners in F/A-18 Airplane Wing Structure

V. K. Babbar[1], P. R. Underhill[1], T. W. Krause[1]
[1]Department of Physics, Royal Military College of Canada, Kingston, ON, Canada

Pulsed eddy current (PEC) is being developed to detect stress corrosion cracks between fasteners on the inner wing spars of the F/A-18 Hornet aircraft. The spars are located below a thick carbon/epoxy wing skin, and so cannot be detected by conventional eddy current techniques without disassembling the wing structure. Also, the effectiveness of PEC to detect defects at greater depths is ...

Estudo Numérico da Eletroquimioterapia em Tumor Cutâneo com Diferentes Configurações de Eletrodos - new

G. Neves[1], D. Suzuki[1], J. Alvim[1], M. Rangel[2]
[1]Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil
[2]Vet Câncer Oncologia Veterinária, São Paulo, SP, Brasil

A eletroquimioterapia é um tratamento de câncer que utiliza a combinação de agentes quimioterápicos e campos elétricos. A base teórica por trás dessa aplicação é a eletroporação. Esse fenômeno biológico consiste na abertura de poros na membrana celular devido à aplicação de pulsos elétricos. Este trabalho analisa o comportamento do campo elétrico gerado por pulsos elétricos aplicados em ...

Resistive Losses in a 3D Coil

U. Hafner [1],
[1] Baumer Electric AG, Frauenfeld, Switzerland

In this presentation it is shown how an axially symmetric coil can be simulated in a non-symmetric environment. A rotationally symmetric coil can be simulated by using a 2D model. Doing so the serial equivalent resistance of the coil is obtained among other results. The influence of the environment needs to be simulated with a 3D model. In this model the single wires of the coil are replaced by ...

Magnetic Stimulation of the Human Brain with Low-Intensity Field

D. Lazutkin[1], A. Harkara[2], and P. Husar[1]
[1]Ilmenau University of Technology, Ilmenau, Thuringia, Germany
[2]Simpleware Limited, Exeter, Devon, United Kingdom

The most popular means of depression treatment are psychotherapy, antidepressant medication and recently adopted transcranial magnetic stimulation (TMS) of the human brain. To overcome their disadvantages we are investigating an application of low-field magnetic stimulation (LFMS) to depression treatment. The 3D electromagnetic model of LFMS has been developed. It employs 8 small coils disposed ...

Current Distribution and Magnetic Fields in Complex Structures Using Comsol Multiphysics

S. F. Madsen, and C. Falkenstrøm Mieritz
Highvoltage.dk ApS
Lejre, Denmark

The present paper presents numerical calculations of the magnetic fields and the current distribution within a wind turbine nacelle. The results are used by control system engineers designing panels and cables, who must ensure that the immunity of the equipment complies with the environment within the turbine. Since the release of the International standard concerning lightning protection of ...

Influence of Voltage Type and Polarity on Electric Field Distribution Along a Polymeric Insulator

Arshad [1], Dr. A. Nekahi [1], S. McMeekin [1], M. Farzaneh [2]
[1] School of Engineering and Built Environment, Glasgow Caledonian University, United Kingdom
[2] Canada Research Chair on Atmospheric Icing Engineering of Power Networks (INGIVRE), Université du Québec à Chicoutimi, QC, Canada

Electric field distribution along an insulator surface is of prime importance for the long term performance of insulators. In this paper electric field and potential distribution along a standard 33 kV polymeric insulator were investigated under different pollution conditions. Effect of voltage type and polarity on the electric field and potential distribution under contaminated conditions were ...

Harmonic and Transient Magnetic Analysis of Single Turn Coils fed by a Current Pulse at Medium Frequency

O. Maloberti [1], O. Mansouri [1], D. Jouaffre [2], D. Haye [2]
[1] ESIEE Amiens, France
[2] PFT Innovaltech, France

Single turn coils are used in pulsed magnetic technologies for which both magneto-harmonic and transient magnetic analysis are required. We suggest studying one single turn coil example made of a conducting massive coil, an optional conducting field shaper and an internal conducting tube supposed to be deformed. The aim of this study is to evaluate the accuracy and reliability of a 2D axi ...