Technical Papers and Presentations

Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquet des phénomènes électriques, mécaniques, fluidiques et chimiques. utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

The GEM Technology for the SBS at Jefferson Lab

F. Noto[1], V. Bellini[1], E. Cisbani[2], and C. Sutera[1]
[1]INFN Sez. di catania, Università di Catania, Italy
[2]INFN Sez. Roma, Italy

The Gas Electron Multiplier (GEM) technology has proven to tolerate rate up to 50 MHz/cm2 without noticeable aging and to provide the required resolution on working chambers up to 33x33 cm2. The SBS GEM chambers have been designed in a modular way: each chamber consists of 3 adjacent GEM modules. Each GEM module has an active area of 40x50 cm2, which 2 represent the current standard double mask ...

Simplifying A Model Of Short Subsequent Sections Containing A Common Detailed Cross-Section

J. Krah
AkerSolutions, Fornebu, Norway

In COMSOL Multiphysics it is possible to implement and simulate several independent models in parallel. This can be meaningful when the different models are coupled to each other by some kind of interaction. If a part of the geometries is identical in all models, this part can be reduced in that it is implemented in only one of the geometries. In the other geometries only its solution towards its ...

Modeling Of A Single Pulse Electric Discharge At Sphere/Flat Interface By Coupling Contact Multiphysics And Phase Transformations

G. Maizza, P. Di Napoli, and R. Cagliero
Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, Torino, Italy

Contact electro-thermal phenomena are of great theoretical and technological interest to a large number of processing applications, such as spot welding, current-assisted sintering, electrical circuitry (switches) and motors. A model has been developed, aiming at predicting physical and metallurgical phenomena in a steel sample upon rapid heating induced by current pulse discharge. Electric pulse ...

Simulation of Flaw Signals in a Magnetic Flux Leakage Inspection Procedure

O. Nemitz, and T. Schmitte
Salzgitter Mannesmann Forschung GmbH, Duisburg, Germany

In the inspection of steel products with respect to flaws a magnetic flux leakage (MFL) test procedure can be applied. In this procedure a “horseshoe” shaped yoke is used, whose legs are wrapped with coils through which an alternate current with a high frequency (3 kHz) is flowing. Hereby a thin magnetic field is induced near the surface of the test object which leaks from the material if a ...

Finite Element Model of a Ferroelectric

P.R. Sainz, A.I. De Andrés Rubio, and A.L. Dorado
Departamento de Electrónica, Escuela Politécnica Superior, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain

Ferroelectric technology continues to attract significant interest due to its wide range of applications (capacitors, nonvolatile memories, accelerometers ...). In this work we present a finite element model of a ferroelectric. Piezoelectric and ferroelectric matrix are included. The coupling between the piezoelectric and ferroelectric parameters be introduced formally using a thermodynamic ...

Parametric Model Of An Air-Core Measuring Transformer

D. Herceg
Faculty of Technical Science, Novi Sad, Serbia

Power grid voltages and currents may be distorted due to presence of harmonics. Measurements of such voltage with harmonics may be performed using newly developed instrument with a small air-core transformer based probe as the input unit. The probe must be shielded against unknown external electromagnetic fields. At the same time, the probe must remain linear throughout the range of frequencies. ...

Modeling of High Temperature Superconducting Tapes, Arrays and AC Cables Using COMSOL

O. Chevtchenko
Technical University of Delft, The Netherlands

In this paper we present a set of numerical models created with COMSOL Multiphysics. The set includes quantitative models of a superconducting tape operated at 77 Kelvin, carrying a transport current and exposed to external magnetic field; an array of such tapes and a triaxial high temperature superconducting cable. Similar models were created in the past. However, an advantage of our approach is ...

Electromagnetic Force Simulations on a Reaction Sphere for Satellite Attitude Control

L. Rossini[1], E. Onillon[1], O.Chetelat[1], and C. Allegranza[2]
[1]Centre Suisse d’Electronique et Microtechnique, Switzerland
[2]ESA/ESTEC, The Netherlands

In the frame of an ESA project, CSEM in collaboration with other partners has developed an innovative Attitude Orbit Control System concept that relies on a Reaction Sphere. We propose to use one unique magnetic bearing Reaction Sphere whose spin axis and angular velocity can be positioned by dedicated control. The design is based on a 3-D permanent magnet motor obtained with a multi pole rotor ...

Verification and Time Performance Analysis of COMSOL v3.5a for Solving the Electromagnetic Problem in a Superconductor Slab

J. Lloberas[1], J. López[1], E. Bartolomé[2], and X. Granados[3]
[1]Universitat Politècnica de Catalunya, Barcelona, Spain
[2]Escola Universitària Salesiana de Sarrià, Barcelona, Spain
[3]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 ...

Using COMSOL Multiphysics for Designing a Hybrid Electromagnetic Launcher

R. Kroczek, and J. Domin
Silesian University of Technology, Gliwice, Poland

This paper describes consecutive stages of design and construction of electromagnetic gun manufactured at the Silesian University of Technology. It gives insight into current knowledge about such a launcher. The computer model was elaborated in COMSOL Multiphysics version 3.5. The numerical analysis was carried out a 3-dimensional space. The physical model was build up and comparison of the ...

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