J. Biggs, P. VonLockette, and S. Lofland
Rowan University, Glassboro, New Jersey
Magnetorheological Elastomers (MREs) are a composite that consist of magnetic micrometer sized particles suspended within rubber matrix filler. By placing this material within an external magnetic field during the rubber curing process, the poles of the particles are forced to align and form chains of particles within the matrix. These chains cause the MRE to change its stiffness properties when ...
V. Babbar, and T. Krause
Department of Physics, Royal Military College of Canada, Kingston, Ontario, Canada
Transient eddy current (TEC) technique is being developed for detection of flaws located at depth within multilayer aluminum structures. The present work involves finite element modeling using COMSOL Multiphysics software to simulate different types of probes by changing some of these parameters in an attempt to generate an output signal of optimum magnitude and shape. Some of the model results ...
F. Osswald, and G. Gaudiot
IPHC, Univ. Louis Pasteur, Strasbourg
This paper presents thermo-mechanical and electromagnetic computational results in the time-harmonic and transient domains. This includes the stress analysis induced by the magnetic field and resulting pressure, the Joule heating with skin effects and the corresponding deformation.
AGH University of Science and Technology, Krakow, Poland
A two dimensional model of a three-coil Active Magnetic Bearing (AMB) is considered where effects associated with stator and shaft lengths are omitted. The performed analysis plays an important role in the design procedures of AMB and helps in the verification of the construction assumptions.
E. Baur, M. Sabathil, and N. Linder
Osram Opto Semiconductors GmbH, Regensburg, Germany
For a proper design shaping of light emitting diodes, the exact knowledge of the current distribution in the active area is essential. On the one hand, one has to achieve a uniform current density over the chip area, on the other hand, one has to avoid current crowding in the neighborhood of the electrical contacts. In this paper it is shown first how a LED can be modeled by COMSOL Multiphysics. ...
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 ...
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 ...
Three-Dimensional Finite Element Modeling of Magnetic Flux Leakage Technique for Detection of Defects in Carbon Steel Plates
W.S. Singh, S. Thirunavukkarasu, S. Mahadevan, C. Mukhopadhyay, B.P.C. Rao, and T. Jayakumar
Non Destructive Evaluation Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam Tamil Nadu, India
Three-dimensional finite element (FE) modeling of magnetic flux leakage (MFL) technique has been performed using COMSOL 3.4 for prediction of leakage fields from surface and sub-surface defects in a 12 mm thick carbon steel plate. The tangential and normal components of leakage fields have been predicted to study the influence of defect location and depth on the detectability of sub-surface ...
R. Bikky, N. Badi, and A. Bensaoula
University of Houston, Houston, TX, USA
In this work, we present the effective properties of nanodielectrics with gold (Au) nanoparticles embedded in polymer (Polyvinyl Pyrrolidone (PVP)) matrix, calculated by using finite element method (FEM) based simulation in COMSOL Multiphysics software. Drude model is used to calculate size dependent complex dielectric function of Au. EMTs of Maxwell-Garnett, Bruggeman and Looyenga models are ...
S. Khushrushahi, and M. Zahn
Massachusetts Institute of Technology, Cambridge, MA, USA
A fully filled sphere of ferrofluid has constant demagnetizing factors in all three Cartesian directions such that when subjected to a uniform external rotating magnetic field the internal field is also uniform, and ultrasound measurements give no observable flow. Non-uniform magnetic fields or a non-uniform distribution of susceptibility are necessary conditions for ferrofluid spin-up flows in ...