Villeneuve-la-Rivière, France
Villeneuve-la-Rivière, France

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Beddek K.,L2EP USTL | Beddek K.,Électricité de France | Le Menach Y.,L2EP USTL | Clenet S.,Arts et Metiers ParisTech | Moreau O.,Électricité de France
Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2010 | Year: 2010

In order to solve the magnetostatic problem using the Finite Element Method, two potential formulations can be used in the deterministic case. In the stochastic case, only the scalar potential formulation has been already proposed. This approach has been applied to a 3D magnetostatic problem and compared to the Monte Carlo Simulation Method. © 2010 IEEE.

Mac D.H.,Arts et Metiers ParisTech | Clenet S.,Arts et Metiers ParisTech | Beddek K.,Électricité de France | Chevallier L.,L2EP USTL | And 3 more authors.
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields | Year: 2014

In this paper, we analyze the influence of the uncertainties on the behavior constitutive laws of ferromagnetic materials on the behavior of a turboalternator. A simple stochastic model of anhysteretic nonlinear B(H) curve is proposed for the ferromagnetic yokes of the stator and the rotor. The B(H) curve is defined by five random parameters. We quantify the influence of the variability of these five parameters on the flux linkage of one phase of the stator winding depending on the excitation current I. The influence of each parameter is analyzed via the Sobol indices. With this analysis, we can determine the most influential parameters for each state of magnetization (according to the level of I) and investigate where the characterization process of the B(H) curve should focus to improve the accuracy of the computed flux linkage. Copyright © 2013 John Wiley & Sons, Ltd.

Boloni F.,L2EP USTL | Benabou A.,L2EP USTL | Tounzi A.,L2EP USTL
COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering | Year: 2010

Purpose: Electrostatic microelectromechanical systems are characterized by the pull-in instability, associated to a pull-in voltage. A good design requires an accurate model of this pull-in phenomenon. The purpose of this paper is to present two approaches tobuilding finite element method (FEM) based models. Design/methodology/approach: Closed form expressions for the computation of the pull-in voltage, can provide fast results within reliable accuracy, except when treating cases of extreme fringing fields. FEM-based models come handy when high accuracy is needed. In the first model presented in this paper, the FEM is used to solve the electrostatic problem, while the mechanical problem is solved using a simplified Euler-Bernoulli beam equation. The second model is a pure FEM model coupling the electrostatic and mechanical problems iteratively through the electrical force. Results for both scalar and vector potential formulations for the FEM models are presented. Findings: In this paper a comparative study of simple pull-in structures is presented, between analytical and 3D FEM-based models. A comparison with analytical models and experimental results is also realized. Research limitations/implications-The coupling between the electrostatic and mechanical problem in the presented approaches, is iterative. Therefore, to improve the accuracy of the presented model, a strong coupling is needed. Originality/value: In the presented FEM-analytical model, the electrostatic problem is solved in both, scalar and vector electric potential formulations. This allows defining an upper and a lower limit for the electrostatic force and consequently for the pull-in voltage. © Emerald Group Publishing Limited.

Rodrigues A.W.O.,French Institute for Research in Computer Science and Automation | Guyomarc'H F.,French Institute for Research in Computer Science and Automation | Dekeyser J.-L.,French Institute for Research in Computer Science and Automation | Menach Y.L.,L2EP USTL
IEEE Transactions on Magnetics | Year: 2012

The electrical and electronic engineerings have used parallel programming to solve their large scale complex problems for performance reasons. However, as parallel programming requires a non-trivial distribution of tasks and data, developers find it hard to implement their applications effectively. Thus, in order to reduce design complexity, we propose an approach to generate code for hybrid architectures (e.g., CPU +GPU) using OpenCL, an open standard for parallel programming of heterogeneous systems. This approach is based on Model Driven Engineering (MDE) and the MARTE profile, standard proposed by Object Management Group (OMG). The aim is to provide resources to non-specialists in parallel programming to implement their applications. Moreover, thanks to model reuse ability, we can add/change functionalities and the target architecture. Consequently, this approach helps industries to achieve their time-to-market constraints which are confirmed here by experimental tests. Besides the software development at high-level abstractions, this approach aims to improve performance by using multi-GPU environments. A case study based on the Conjugate Gradient method gives clarity to our methodology. © 2012 IEEE.

Beddek K.,L2EP USTL | Beddek K.,Électricité de France | Le Menach Y.,L2EP USTL | Clenet S.,Arts et Metiers ParisTech | Moreau O.,Électricité de France
IEEE Transactions on Magnetics | Year: 2011

Stochastic spectral finite-element method can be used to take into account some random aspects in the input data (material characteristic, source terms) involved in static electromagnetism problems. Similarly to the deterministic case, two potential formulations can be used in the stochastic case. The vector potential formulation applied to static problems is developed and compared to the scalar potential one, previously developed. © 2011 IEEE.

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