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 ...
M. Penzel , M. Hackert-Oschätzchen , M. Kreißig , M. Kowalick , M. Zinecker , A. Schubert , G. Meichsner ,
 Professorship Micromanufacturing Technology, Technische Universität Chemnitz, Chemnitz, Germany
 Professorship Micromanufacturing Technology, Technische Universität Chemnitz, Chemnitz, Germany; Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
 Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
Precise electrochemical machining (PEM) is a non-conventional machining technology, based on anodic dissolution of metallic work-pieces. In this study an additional extension of the precise electrochemical machining with a precise angle-controlled cylinder positioning is aimed. Due to the help of the angle-controlled cylinder positioning, with PEM e.g. stamping and extrusion dies can be ...
Y. Kostogorova-Beller, and R. Collins
National Institute for Aviation Research, Wichita, KS, USA
Hawker Beechcraft Corporation, Wichita, KS, USA
An interaction of aluminum aircraft skins with a laboratory-simulated, low-level, long-duration, continuing current representative of a natural lightning flash was modeled with COMSOL Multiphysics. For the analysis of the lightning direct effects on aircraft, the external environment is represented by the idealized current components. Particularly Component C is used and is characteristic of ...
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 ...
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 ...
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 ...
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 ...
R. Wislati , H. Haase
Leibniz Universität Hannover, Germany
In this paper an electromagnetic solenoid actuator (EMVA) consisting of an upper and lower electromagnet, a linear moving armature and two preloaded springs is considered as a potential approach in Variable Valve Actuation (VVA) Systems for Internal Combustion Engines. In opposition to common approaches the underlying EMVA make use of a permanent magnet in the upper electromagnet. The analysis ...