International Journal of Applied Electromagnetics and Mechanics - Volume 19, issue 1-4

Authors: Nouicer, Abdelmadjid | Latreche, M.E.H. | Feliachi, Mouloud

Article Type: Research Article

Abstract: Conventional reconstruction of the compressed data based on the inverse wavelet transform (IWT) does not give good results (too much loss of information) because of the neglected detail part especially for the high levels decomposition. To deal with this problem, a new approach for the reconstruction of the compressed data, based on the inverse wavelet transform and the Hopfield neural networks is presented in this paper.

Keywords: electromagnetic problems, FEM, hopfield network, wavelet transform

DOI: 10.3233/JAE-2004-637

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 607-611, 2004

Authors: Gagnoud, Annie

Article Type: Research Article

Abstract: A 3D numerical method has been developed to model the coils used in inductive processes. The method is based on Ohm's law and Biot and Savart's law and can be used to solve eddy current problems at mid-range or high frequencies. The unknowns are the current density and electrical potential. The formulation involves singular integrals and produces a fully linear system, as in the boundary integral method. For these frequencies, only the surface of the conductors …needs to be meshed. To obtain a general approach, the interpolation, derivation and integration techniques commonly used in the finite element method are employed. A number of examples show the interest of this method. Show more

Keywords: eddy current, 3D numerical method, integral method, electric impedance

DOI: 10.3233/JAE-2004-638

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 613-617, 2004

Authors: Hashizume, Hidetoshi | Usui, Yoshiaki | Kitajima, Sumio | Sagara, Akio

Article Type: Research Article

Abstract: Numerical analysis of MHD flow in rectangular channel is performed to evaluate the performance of remountable first wall with liquid blanket like Li or Flibe, where fabrication and maintenance of the system become extremely simplified. Four-channel model is used to calculate the MHD pressure drop in variously coated channels. The effect of crack existence in the coated layer of flow channel on the MHD pressure drop is also evaluated for real usage. The numerical results indicate …that some amount of crack existence is allowable, which shows possibility to apply the first wall concept to future fusion reactor design. Show more

Keywords: MHD pressure drop, first wall, fusion reactor

DOI: 10.3233/JAE-2004-639

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 619-623, 2004

Authors: Tahri, Younes | Sahbi, Mariem | Masmoudi, Ahmed | Elantably, Ahmed

Article Type: Research Article

Abstract: The paper is devoted to a finite element analysis based design of an electromagnetic system dedicated for hybrid propulsion systems. It consists of two concentric permanent magnet machines, yielding the so-called "single stator dual rotor permanent magnet machine", with an inner rotor, an outer rotor and a stator sandwiched between the two rotors. In order to decouple magnetically both machines, a non magnetic material ring is inserted between the two stators. Giving the small dimensions of …the inner machine, special attention is focused upon its sizing. Show more

Keywords: single stator dual rotor permanent magnet machine, magnetic decoupling, torque production capability

DOI: 10.3233/JAE-2004-640

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 625-629, 2004

Authors: Oussaid, Rachid | Haraoubia, Brahim

Article Type: Research Article

Abstract: In this approach, we study the behavior of a chiral material in terms of the propagation of guided wave. In this study, we are particularly interested by the field distribution in a coplanar structure based on the involved chiral material. This chiral material is supposed to be homogeneous, isotropic and lossless. In this paper, the characteristics of wave guided propagation in chiral medium have been analyzed. Using Maxwell's curl equations for source-free regions together with the …set of constitutive relations, the dispersion relation of propagating and evanescent modes for this chirowaveguide have been obtained and analyzed. We show that the existent modes regardless to their nature: propagative or evanescent; are both bifurcated modes. In this paper, the formalism used to describe the chirowaveguide represent a new approach, which is based on calculation of longitudinal and transverse operators. The derivation proposed here is new and different of that used in [4]. The results obtained, using a different method based on a new mathematical approach, are substantially the same as that one published in the literature. Show more

Keywords: chiral media, electromagnetic, wave propagation

DOI: 10.3233/JAE-2004-641

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 631-635, 2004

Authors: Jordan, Andrzej J. | Nowacki, Jerzy P.

Article Type: Research Article

Abstract: The global linearization method is used to solve multivariable non-linear state equations. This method makes use of a simple and invertible change of coordinates based on global diffeomorphism. A full agreement of the solutions of the linear and non-linear models was obtained. Two examples of practical application of this method have been presented: the first – a non-linear model of a DC drive system, and the second – an electrical circuit with a non-linear diode.

Keywords: state equation, global linearization, iterative method, global diffeomorphism

DOI: 10.3233/JAE-2004-642

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 637-642, 2004

Authors: De Cecco, Eric | Marchand, Claude | Besbes, Mondher

Article Type: Research Article

Abstract: The aim of this paper is to describe a software tool for conception and optimisation of permanent magnet synchronous machines associated to their converters, using a coupled model for magnetic field and electrical circuit equations. In this paper, the emphasis is on the specifications of the tool: modularity, adaptability and evolutive capacity.

Keywords: synchronous machines, software tool, finite element method, optimisation

DOI: 10.3233/JAE-2004-643

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 643-646, 2004

Authors: Joubert, Pierre-Yves | Bihan, Yann Le

Article Type: Research Article

Abstract: The authors consider the detection of cracks appearing close to the rivets in ageing riveted lap joints of aircraft structures, using the eddy current (EC) technique. As the presence of the rivets perturbs the interpretability of the defect EC signatures, the authors propose to fuse the data provided by oriented field EC sensors used in different operating modes. Different fusion rules are considered and the performances of defect detection are then characterized with receiver operating characteristic …curves. Show more

Keywords: EC sensor, defect detection, riveted lap joints, data fusion, receiver operating characteristic

DOI: 10.3233/JAE-2004-644

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 647-651, 2004

Authors: Satou, Shouji | Fujisaki, Keisuke | Furukawa, Tatsuya

Article Type: Research Article

Abstract: In the continuous casting process, it is very important to make the dynamic behavior of free surface of molten steel clear, because surface quality of steel is almost decided by conditions of free surface. The conventional MHD calculation, which has been used to design the process, was using only the constant electromagnetic force in the time. Then, we developed new MHD calculation also taking the cyclic electromagnetic force into account, and confirmed that free surface vibrates …more intensely than conventional result. Therefore, to make the dynamic behavior of free surface clear, cyclic electromagnetic force must be considered. Show more

Keywords: continuous casting, electromagnetic analysis, magneto hydrodynamic calculation

DOI: 10.3233/JAE-2004-645

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 653-657, 2004

Authors: Stancu, Alexandru | Postolache, Petronel | Stoleriu, Laurentiu

Article Type: Research Article

Abstract: In this paper we present an identification algorithm of the Preisach distribution from the FORC diagram. This method does not imply the use of an analytical function for the Preisach distribution which makes it very useful when such an approximation is not available. Test problems based on simulations made with the Generalized Preisach Model are presented and the results are discussed.

Keywords: preisach model, FORC diagram, identification methodology

DOI: 10.3233/JAE-2004-646

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 659-662, 2004