On the Influence of Cancellous Bone Structure upon the Electric Field Distribution of Electrostimulative Implants
U. Zimmermann, R.Bader, U. van Rienen
Institute of General Electrical Engineering, University of Rostock, Rostock, Germany
Department of Orthopaedics, University Medicine Rostock, Rostock, Germany
Since the 1980s, the accelerating effect of electromagnetic fields on bone regeneration is used to treat complicated fractures and bone diseases. At the University of Rostock, an electrostimulative hip revision system is developed, basing on the method of Kraus-Lechner. This method requires an electric fields between 5 and 70 V/m. The bone used for the simulations consisted of two homogenous ...
Nogueira, A.1, Nóvoa, X.R.1, Keddam, M.2, Vivier, V.2
1 Universidade de Vigo (E.T.S.E.I.) Spain
2 UPR 15 CNRS “LISE”, case 133 - Université P. & M. Curie, Paris, France
The electrochemical impedance spectroscopy (EIS) measurements in reinforced concrete are reported and compared with 3D-finite element simulations with FEMLAB software. It was shown that the current injected in the cement past was partially collected by the reinforcement. Moreover, from both experimental results and calculations, it was shown that the fraction of current collected depends on the ...
S. Letout1, J. C. Tissier2 , G. Cognet1, Y. Fautrelle1, and Y. Du Terrail Couvat1
1SIMAP Laboratory (INPG-CNRS), Saint Martin d’Hères, France
2Ecole Centrale de Lille, Villeneuve D'Ascq, France
A parametric simulator for a dezincification process industrial device analysis has been developed. The device is built upon a COMSOL Multiphysics magneto-thermo-hydraulic coupled model in a cylindrical coordinate system.We study effects of electromagnetic forces on a cast iron load and consequently on Zn gas bubbles trajectories included in the metal.Trajectories are obtained according to mass ...
R. Gamache, and D. Spinelli
TransTech Systems, Inc., Schenectady, NY, USA
Tunnels and their detection have been a problem in warfare since the ancient world. Recent events have highlighted the ongoing problems of tunnels and the difficulties in locating them, not only in military situations, but also in law enforcement and homeland security applications as well. Electromagnetic and acoustic or seismic techniques may provide the significant advantage of a mobile non ...
T. Müller, A. Schwenger, and H. Haase
Institut für Grundlagen der Elektrotechnik und Messtechnik, Leibniz Universität Hannover, Germany
Volkswagen AG, Germany
This paper describes the automatic optimization of an electromagnetic actuator using a genetic algorithm. The actuator modeled here is dedicated for charge changing valve actuation in internal combustion engines. In the first step of the simulation, several operating points are calculated using the script language of COMSOL Multiphysics. In order to reduce computation time, only one segment of ...
F. Grilli, A. Lucarelli, G. Lüpke, T. Haugan, and P. Barnes
Ecole Polytechnique de Montréal, Montréal, QC, Canada
College of William and Mary, Williamsburg, VA, USA
Air Force Research Laboratory
We have developed a model for computing current and field distributions in multifilamentary superconducting thin films subjected to the simultaneous effects of transport ac current and applied dc field perpendicular to the sample. The model is implemented in COMSOL’s PDE module (general form) and solves Maxwell equations using a highly non-linear resistivity to describe the superconductor ...
T. Reissman, and E. Garcia
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, USA
In this work, an analysis is presented for a 3-dimensional RF MEMS coil using the COMSOL AC/DC module in conjunction with the CAD import module. The realization of being able to produce such 3-dimensional RF coils allows for less surface area to be needed for similar inductor performance in comparison to larger planar RF coils by maintaining the same number of turns through super-positioning of ...
Verification and Time Performance Analysis of COMSOL v3.5a for Solving the Electromagnetic Problem in a Superconductor Slab
J. Lloberas, J. López, E. Bartolomé, and X. Granados
Universitat Politècnica de Catalunya, Barcelona, Spain
Escola Universitària Salesiana de Sarrià, Barcelona, Spain
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 ...
R. S. Wadhwa, T. Lien, and G. Monkman
NTNU Valgrinda, Inst. for produksjons- og kvalitetstek., Trondheim, Norway
FH Regensburg, Regensburg, Germany
The magnetic field gradient produced by an electromagnet gripper head depends on its design. Stochastic Methods offer certain robustness to the design optimization process. In this paper, Improved Discrete Particle Swarm Optimization (IDPSO) searching technique is applied to the shape and magnetic field gradient optimization of an electromagnet head. The magnetic field and forces are computed ...
G.E. Stebner, C. Hartwig
Ostfalia University, IMEC, Wolfenbüttel, Germany
In this paper an EMVD (Electro-Mechanical Valve Drive) for combustion engines is redesigned to achieve a fail-safe behavior when power loss occurs. The AC/DC Module and the Moving Mesh interface of COMSOL Multiphysics 4.2 are used to build up a transient model. This model also includes the calculation of eddy currents.