Sandia National Laboratories, Albuquerque, NM, USA
We have developed Thor: a pulsed power accelerator for performing dynamic material experiments. The design was aided by using the COMSOL Multiphysics® software with the AC/DC Module and RF Module. Our design process involved optimizing the impedance of the system while maintaining a good margin against electrical breakdown. By using a three-dimensional electromagnetic model of the entire power ...
F. Malbos , M. Bogdanski , M. Strauss ,
 Harman, Paris, France
 Harman Becker Automotive Systems, Straubing, Germany
For automotive applications, simulation methods are used to get the best audio acoustic performance. Because a loudspeaker is a non linear device, the sound pressure in the vehicle includes harmonics which are mainly created by the force factor, suspension stiffness and voice coil inductance of the loudspeaker. This paper shows how to simulate those non linear components using COMSOL ...
L. Bortot , M. Maciejewski , M. Prioli , B. Auchmann ,
 CERN, Geneva, Switzerland
 CERN, Geneva, Switzerland; Lodz University of Technology, Lodz, Poland
 CERN, Geneva, Switzerland; Paul Scherrer Institute, Zurich, Switzerland
The paper presents the application of COMSOL Multiphysics® software to the modelling of superconducting accelerator magnets. A 2D magneto-thermal model is developed, using an equivalent magnetization formulation to take into account the eddy-currents’ effects. Due to the model complexity, a suitable workflow has been developed in Java® to extensively use the available COMSOL API. The automation ...
Bennex AS, Bergen, Norway
Controlling electric field distribution in high voltage components is critical to avoid excessive electric stress on the insulation and thus reducing the risk of insulation breakdown and damage to equipment. For subsea applications this is even more important due to the costs involved in accessing and replacing the damaged parts. This paper describes how COMSOL Multiphysics has been used for ...
T. Jayakumar, B. Purnachandra Rao, C. K. Mukhopadhyay, B. Sasi, V. Arjun, S. Thirunavukkarasu
Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, TN, India
Nondestructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, TN, India
EMSI Section, Nondestructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, TN, India
NDE Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, TN, India
Remote field eddy current (RFEC) technique is a method of detecting defects in ferromagnetic tubes. This is based on low frequency eddy current, which employs an exciter coil and a receiver coil separated by a characteristic distance. The exciter is fed with a low frequency sinusoidal current and the receiver coil senses the perturbation of the magnetic fields caused by the eddy currents in the ...
Sonsight Inc. / NSWC, Accokeek, MD, USA
Cogging torque in permanent magnet motors and generators is characterized by a torque ripple. These torque fluctuations cause vibrations, noise and speed fluctuations. This paper presents finite element (FE) analyses results that show a previously unaddressed low frequency modulation of cogging torque ripple. The paper resulted in an analytical formulation of cogging torque with low frequency ...
H. Cabrera, D. A. Zanin, L. G. De Pietro, A. Vindigni, U. Ramsperger, D. Pescia
Laboratory for Solid State Physics, ETH Zürich, Zürich, Switzerland
In our recent experiments we are revisiting the topografiner technology for the imaging of surface topography with a resolution of a few nanometers. In these new technique called Near-Field Emission Scanning Electron Microscopy (NFESEM), low-energy electrons are emitted from a polycrystalline tungsten tip via electric-field assisted tunneling. In order to characterize and improve the ...
H. P. Ferreira, A. Endalecio, E. Rodriguez, R. M. Stephan
Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
Levitation has found important applications in several areas of engineering, from microgravity to transportation systems. Electrodynamic levitation consists of the interaction of a varying in time magnetic field – provided by an alternating voltage supplying a coil or a moving permanent magnet. The main applications of this technique are MagLev trains and magnetic bearings. The electrodynamic ...
T. S. Jones , C. R. Pérez , J. J. Santiago-Avilés ,
 University of Pennsylvania, Philadelphia, PA, USA
Microwave impedance microscopy (MIM) is a novel mode of atomic force microscopy that can measure topography and local electrical impedance simultaneously and with nanometer spatial resolution . This technique is typically used qualitatively, identifying defects in nanodevices or imaging ferroelectric domain walls, for example. However, the technique also has the potential to be used in a more ...
R. Diaz de Leon , G. Gonzalez , A. G. Rodriguez , E. Flores , F. J. Gonzalez ,
 Universidad Autonoma de SLP, San Luis Potosi, S.L.P., Mexico
 Instituto Tecnologico de SLP, San Luis Potosi, S.L.P., Mexico
A genetic algorithm was programmed in MATLAB® software and linked to the COMSOL Multiphysics® software with the COMSOL LiveLink™ for MATLAB® to optimize the geometry of an optical antenna (nanoantenna). The proposed computational model demonstrated that nanoantenna geometries does not feature a conventional macroscopical antenna geometry, such as those utilized for the radiofrequency range. In ...