Thomas Henneron

maître de conférences - modélisation numérique en électromagnétisme basse fréquence
CNU : SECTION 63 - ELECTRONIQUE, OPTRONIQUE ET SYSTEMES
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Thomas Henneron

maître de conférences - modélisation numérique en électromagnétisme basse fréquence

Publications

Revues internationales avec comité de lecture

[1]   Structure Preserving Model Reduction of Low Frequency Electromagnetic Problem based on POD and DEIM
IEEE Transactions on Magnetics, Vol. 53, N°. 6, 06/2017, Abstract
MONTIER Laurent, PIERQUIN Antoine, HENNERON Thomas, CLENET Stéphane

The Proper Orthogonal Decomposition (POD) combined with the (Discrete) Empirical Interpolation Method (DEIM) can be used to reduce the computation time of the solution of a FE model. However, it can lead to numerical instabilities. To increase the robustness, the POD_DEIM model must be constructed by preserving the structure of the full FE model. In this article, the structure preserving is applied for different potential formulations used to solve electromagnetic problems.

[2]   Comparison of DEIM and BPIM to Speed up a POD-based Nonlinear Magnetostatic Model
IEEE Transactions on Magnetics, Vol. 53, N°. 6, 06/2017, Abstract
HENNERON Thomas, MONTIER Laurent, PIERQUIN Antoine, CLENET Stéphane

Proper Orthogonal Decomposition (POD) has been successfully used to reduce the size of the equation system and the computation time of linear Finite Element (FE) problems. With a nonlinear behavior law, the POD is not so efficient due to the computation cost of nonlinear entries of the full FE model. Then, the POD approach must be combined with an interpolation method of nonlinear terms to obtain an efficient reduced model. An interpolation method consists on the computation of a small number of nonlinear entries and on the interpolation of other terms. Different methods have been presented to select the set of nonlinear entries to be calculated. Then, the (Discrete) Empirical Interpolation method ((D)EIM) and the Best Points Interpolation Method (BPIM) have been developed. In this article, we propose to compare two reduced models based on the POD-(D)EIM and on the POD-BPIM in the case of nonlinear magnetostatics coupled with electric equation.

[3]   Balanced Proper Orthogonal Decomposition Applied to Magnetoquasistatic Problems Through a Stabilization Methodology
IEEE Transactions on Magnetics, 04/2017
MONTIER Laurent, HENNERON Thomas, GOURSAUD Benjamin, CLENET Stéphane

[4]   A method coupling modified vector potential A* and homogenization formulations to model short circuits in lamination stacks
The European Physical Journal - Applied Physics (EPJ AP), Vol. 75, N°. 3, pages. 11, 08/2016, Abstract
ZIANI Smail, HENNERON Thomas, PUIGDELLIVOL Oriol, LE MENACH Yvonnick

In this paper a method in 2-D frequency domain is presented to simulate a laminated iron core with a short-circuit between several magnetic sheets. The approach consists in coupling homogenization methods and finite element method. The defect is modeled with A* modified vector potential formulation and the rest of the structure with a homogenization method. The coupled method is applied to a lamination stack containing a short-circuit and compared to the reference, where the A* formulation is applied on the whole domain. Finally, a thermal modeling of lamination stack is presented to study the influence of an insulating defect.

[5]   Model-Order Reduction of Magneto-harmonic Problems Based on POD. Application to Planar Magnetic Components
The European Physical Journal - Applied Physics (EPJ AP), Vol. 74, N°. 1, pages. 10903, 04/2016, URL, Abstract
TAYLOR Laurent, HENNERON Thomas, MARGUERON Xavier, LE MENACH Yvonnick, LE MOIGNE Philippe

Predetermination of losses and inductance values in the design phase, is necessary for the development of high-performance magnetic components for power electronics. Numerical modeling, based on the Finite Element Method (FEM) can be used to determine the characteristics of a particular component with a complex geometry in high frequency (HF). These models are very accurate but the computation time required is high compared to analytical models. The Model Order Reduction (MOR) methods can be applied to reduce the computation time while maintaining high accuracy. Nowadays, the Proper Orthogonal Decomposition (POD) is the most popular of MOR approaches. This technique has been applied to study problems in many elds of engineering. In this paper, the POD method is developed to solve magneto-harmonic problems in order to study a planar magnetic inductor.

[6]   Multirate coupling of controlled rectifier and non-linear finite element model based on Waveform Relaxation Method
IEEE Transactions on Magnetics, Vol. 52, N°. 3, 03/2016
PIERQUIN Antoine, HENNERON Thomas, BRISSET Stéphane, CLENET Stéphane

[7]   Multidisciplinary optimization formulation for the optimization of multirate systems
IEEE Transactions on Magnetics, Vol. 52, N°. 3, 03/2016
PIERQUIN Antoine, BRISSET Stéphane, HENNERON Thomas

[8]   Time periodicity condition of nonlinear magnetostatic problem coupled with electric circuit imposed by Waveform Relaxation Method
IEEE Transactions on Magnetics, Vol. 52, N°. 3, 03/2016, URL, Abstract
CARON Guillaume, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

In numerical computation, the finite element (FE) method associated with external electric circuits is often used to evaluate electromagnetic devices with voltage sources. To study the solution of the steady state, the computation time can be prohibitive due to a large transient state compared to the time step used to discretize the time domain. In this paper, a method based on Waveform Relaxation Method is developed in order to impose the steady state of the solution in the case of a nonlinear magnetostatic problem coupled with electric circuit equations.

[9]   Transient simulation of an electrical rotating machine achieved through model order reduction
Advanced Modeling and Simulation in Engineering Sciences, Vol. 3, N°. 10, 03/2016, URL, Abstract
MONTIER Laurent, HENNERON Thomas, CLENET Stéphane, GOURSAUD Benjamin

Model order reduction (MOR) methods are more and more applied on many different fields of physics in order to reduce the number of unknowns and thus the computational time of large-scale systems. However, their application is quite recent in the field of computational electromagnetics. In the case of electrical machine, the numerical model has to take into account the nonlinear behaviour of ferromagnetic materials, motion of the rotor, circuit equations and mechanical coupling. In this context, we propose to apply the proper orthogonal decomposition combined with the (Discrete) empirical interpolation method in order to reduce the computation time required to study the start-up of an electrical machine until it reaches the steady state. An empirical offline/online approach based on electrical engineering is proposed in order to build an efficient reduced model accurate on the whole operating range. Finally, a 2D example of a synchronous machine is studied with a reduced model deduced from the proposed approach.

[10]   Space-Time Field Projection: Finite-Element Analysis Coupled Between Different Meshes and Different Time-Step Settings
IEEE Transactions on Magnetics, Vol. 52, N°. 3, 03/2016
WANG Zifu, HENNERON Thomas, HOFMANN Heath

[11]   Application of the PGD and DEIM to Solve a 3-D Non-Linear Magnetostatic Problem Coupled With the Circuit Equations
IEEE Transactions on Magnetics, Vol. 52, N°. 3, 03/2016
HENNERON Thomas, CLENET Stéphane

[12]   Reduction of a Finite-Element Parametric Model Using Adaptive POD Methods—Application to Uncertainty Quantification
IEEE Transactions on Magnetics, Vol. 52, N°. 3, 03/2016
CLENET Stéphane, HENNERON Thomas, IDA Nathan

[13]   Error Estimation for Model Order Reduction of Finite Element Parametric Problems
IEEE Transactions on Magnetics, Vol. 52, N°. 8, pages. 1-10, 03/2016, URL
CLENET Stéphane, HENNERON Thomas

[14]   Optimisation process to solve multirate system
Przeglad Elektrotechniczny, Vol. 2015, N°. 6, pages. 54-57, 06/2015, URL
PIERQUIN Antoine, BRISSET Stéphane, HENNERON Thomas, CLENET Stéphane

[15]   Proper Generalized Decomposition Method Applied to Solve 3-D Magnetoquasi-Static Field Problems Coupling With External Electric Circuits
IEEE Transactions on Magnetics, Vol. 51, N°. 6, 06/2015
HENNERON Thomas, CLENET Stéphane

[16]   Model-Order Reduction of Multiple-Input Non-Linear Systems Based on POD and DEI Methods
IEEE Transactions on Magnetics, Vol. 51, N°. 3, 04/2015
HENNERON Thomas, CLENET Stéphane

[17]   Energetic Mesh-to-Mesh Projection of Magnetic Fields With Respect to Nonlinear B-H Curves
IEEE Transactions on Magnetics, Vol. 51, N°. 3, 04/2015
WANG Zifu, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

[18]   End-Region Leakage Fluxes and Losses Analysis of Cage Induction Motors Using 3-D Finite-Element Method
IEEE Transactions on Magnetics, Vol. 51, N°. 3, 04/2015, URL, Abstract
CHEAYTANI Jalal, BENABOU Abdelkader, TOUNZI Abdelmounaïm, DESSOUDE Maxime, CHEVALLIER Loïc, HENNERON Thomas

The stray load losses (SLLs) in electrical machines represent a non-negligible contribution of the total losses and a key point for an accurate evaluation of the energy efficiency of considered device. In this paper, one aspect of these SLLs, the end-region leakage fluxes and losses, is investigated and considered for the case of a high-power cage induction motor. The study is performed at locked rotor, no-load, and rated load conditions using a 3-D finite-element modeling approach. The influence of the leakage flux on the end-region conductive parts of the motor is analyzed together with the eddy current loss calculation. Finally, the SLLs are calculated and compared with the experimental measurements based on the IEEE standard 112-method B test.

[19]   Error estimation of a proper orthogonal decomposition reduced model of a permanent magnet synchronous machine
IET Science, Measurement & Technology, 03/2015
HENNERON Thomas, CLENET Stéphane

[20]   Model Order Reduction of Magnetoquasistatic Problems Based on POD and Arnoldi-based Krylov Methods
IEEE Transactions on Magnetics , Vol. 51, N°. 3, 03/2015
PIERQUIN Antoine, HENNERON Thomas, CLENET Stéphane, BRISSET Stéphane

[21]   Energetic Galerkin Projection of Electromagnetic Fields Between Different Meshes
IEEE Transactions on Magnetics, Vol. 50, N°. 2, pages. 613-616, 02/2014, URL, Abstract
WANG Zifu, TANG Zuqi, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

Mesh-to-mesh field transfer arises frequently in finite element computations. Typical applications may concern remeshing, multigrid methods, domain decomposition and multi-physics problems. For electromagnetic fields, one of the essential constraints in such transfers is to conserve energetic quantities such as the magnetic energy and the joule heating. Within the framework of Galerkin projection on overlapping domains, we introduce the definition of energetic norms for electromagnetic fields. The corresponding formulations we propose, provide energy-conserving projection of electromagnetic fields between different meshes.

[22]   Model Order Reduction of Non-Linear Magnetostatic Problems Based on POD and DEI Methods
IEEE Transactions on Magnetics, 02/2014
HENNERON Thomas, CLENET Stéphane

[23]   Model order reduction applied to the numerical study of electrical motor based on POD method taking into account rotation movement
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 02/2014
HENNERON Thomas, CLENET Stéphane

[24]   Benefits of Waveform Relaxation Method and Output Space Mapping for the Optimization of Multirate Systems
IEEE Transactions on Magnetics, Vol. 50, N°. 2, pages. 653-656, 02/2014, Abstract
PIERQUIN Antoine, BRISSET Stéphane, HENNERON Thomas, CLENET Stéphane

We present an optimization problem that requires the modeling of a multirate system composed of subsystems with different time constants. We use waveform relaxation method (WRM) in order to simulate such a system, but computation time can be penalizing in an optimization context. Thus, we apply output space mapping (OSM) that uses several models of the system to accelerate optimization. WRM is one of the models used in OSM.

[25]   Comparison of Implementation Techniques for Galerkin Projection Between Different Meshes
Journal of Numerical Modelling: Electronic Networks, Devices and Fields, 12/2013, Abstract
WANG Zifu, HENNERON Thomas, DULAR Patrick, MIPO Jean-Claude, PIRIOU Francis

To solve multi-physics problems, weak coupling of finite element calculations can be carried out: the subproblems of which the physical nature differs, are solved separately on their own meshes. In this case, Galerkin projection provides useful tool to ensure the transfer of physical fields between different meshes. In terms of implementation, the Galerkin projection system can be either accurately assembled over the intersection of two meshes or approximately integrated over the target mesh. This paper describes and compares these two implementation techniques for the Galerkin projection.

[26]   Model order reduction of quasi-static problems based on POD and PGD approaches
EPJ AP, Vol. 64, N°. 2, 10/2013
HENNERON Thomas, CLENET Stéphane

[27]   Electromagnetic Field Projection on Finite Element Overlapping Domains
IEEE Transactions on Magnetics, Vol. 49, N°. 4, pages. 1290-1298, 04/2013, Abstract
WANG Zifu, HENNERON Thomas, NEMITZ Nicolas, MIPO Jean-Claude, PIRIOU Francis

Coupled problems are made up of subproblems of which the physical nature differs. Using indirect coupling models, the subproblems are calculated separately on their own meshes to ensure precision. To obtain a precise solution for the total problem, it is important to ensure the transmission of information between the subproblems. In this paper, we present field projection methods on overlapping domains. In comparison to earlier works, the classical $L^{2}$ or $mathbf{L}^{2}$ projection theory is extended to $H(mathbf{grad})$, $mathbf{H}(mathbf{curl})$ and $mathbf{H}(div)$ to obtain increased projection accuracy for the distributional derivatives. A Petrov-Galerkin method is then presented to fill the test space using a bi-orthogonal basis, without losing the optimality of the result in comparison to the $L^{2}$ or $mathbf{L}^{2}$ Ritz-Galerkin method. Using the Petrov-Galerkin method and bi-orthogonal test functions, the projection is presented using a diagonal matrix. However, in the standard Ritz-Galerkin projections, a linear system must be solved.

[28]   Nonlinear Proper Generalized Decomposition Method Applied to the Magnetic Simulation of a SMC Microstructure
IEEE Transactions on Magnetics, Vol. 48, N°. 11, 11/2012
HENNERON Thomas, BENABOU Abdelkader, CLENET Stéphane

[29]   Interlaminar short circuit detection: modeling and measurement
Compel, Vol. 31, N°. 5, 08/2012, Abstract
MÜLLER Juliana-Luisa, ROMARY Raphaël, BENABOU Abdelkader, HENNERON Thomas, PIRIOU Francis, BASTOS João Pedro Assumpção, ROGER Jean-Yves

Short circuits in turbo-generator stators can lead to a modification of the magnetic flux distribution that impacts the performances and, in some extreme cases, can lead to local damage of the iron core. This work presents the modeling of short circuited laminations in a stator yoke of a turbo-generator. A 3D finite element (FE) model, associated to a homogenization technique, is used to calculate the short circuit current. The results are compared with the experiment, especially for the electrical signature of the diagnosis test known as Electromagnetic Core imperfection detector (El Cid).

[30]   Mortar method using bi-orthogonal nodal functions applied to A-phi formulation
IEEE transaction on magnetics, Vol. 48, N°. 2, 02/2012
AUBERTIN Mathieu, HENNERON Thomas, PIRIOU Francis

[31]   High Order Surface Impedance Boundary Conditions with the A-Φ Formulation
Facta Universitatis: Electronics and Energetics, Vol. 24, N°. 2, pages. 147-155, 08/2011
IDA Nathan, LE MENACH Yvonnick, HENNERON Thomas

[32]   An approach to determine the circulation of magnetic field in FEM computation code with vector potential formulation
IEEE transaction on magnetics, 01/2011
HENNERON Thomas, PIRIOU Francis, ROGER Jean-Yves

[33]   Overlapping finite elements used to connect non-conforming meshes in 3D with a vector potential formulation
IEEE transaction on magnetics, 01/2011, Abstract
KREBS Guillaume, HENNERON Thomas, CLENET Stéphane, LE BIHAN Yann

Overlapping elements can be used to connect non-conforming meshes in the finite-element method. This approach has been developed with the scalar potential formulation and used to solve magnetostatic problems but not in the case of the vector potential formulation. In this paper, we propose to introduce the overlapping element method in this second formulation

[34]   Periodic and Anti-periodic boundary conditions with the Lagrange multipliers in the FEM
IEEE Transactions on Magnetics, Vol. 46, N°. 8, 08/2010, Abstract
AUBERTIN Mathieu, HENNERON Thomas, PIRIOU Francis, GUERIN Pierre, MIPO Jean-Claude

An approach based on the double Lagrange multipliers is developed in the finite element method in order to impose complex periodic or anti-periodic boundary conditions. The magnetostatic equations are solved using the vector or scalar potential formulations. In order to show the possibilities of the proposed approach, an example of application is studied and the results are discussed.

[35]   Single and Double Lagrange multipliers approaches applied to the Scalar potential formulation used in magnetostatic FEM
Przeglad Elektrotechniczny, Vol. 5, 05/2010, Abstract
AUBERTIN Mathieu, HENNERON Thomas, BOITEAU Olivier, PIRIOU Francis, GUERIN Pierre

In this paper, we propose to introduce the single and double Lagrange multipliers approaches in the case of the finite element method (FEM). These approaches allow non-conforming meshes to be linked together. The methods introduced are developed in the case of a magnetostatic problem solved by the scalar potential formulation. An application is studied and the results obtained by both approaches are compared.

[36]   Source-Field Method for 3D Magnetostatics: Influence of the Potential Created by the Exciting Currents
JOURNAL OF MICROWAVES, OPTOELECTRONICS AND ELECTROMAGNETIC APPLICATIONS, Vol. 8, N°. 1, pages. 135-142, 06/2009
HENNERON Thomas, PIRIOU Francis, TOUNZI Abdelmounaïm, CLENET Stéphane, BASTOS João Pedro Assumpção

[37]   Electromagnetic modelling of short circuited coreplates
The international Journal for Computation and Mathematics in Electrical and Electronic Engineering (COMPEL), Vol. 28, N°. 3, pages. 762-771, 02/2009, URL, Abstract
ROGER Jean-Yves, VRIGNAUD Emmanuel, HENNERON Thomas, BENABOU Abdelkader, DUCREUX Jean-Pierre

Coreplates in large generators may suffer from local short circuits. An accurate analysis is required to avoid these failures and detect them when occurring. The purpose of this paper is to develop a lamination stack model compliant with interlamination default analysis.

[38]   Discrete finite element characterizations of source fields for volume and boundary constraints in electromagnetic problems
Journal of Computational and Applied Mathematics, Vol. 215, N°. 2, pages. 438-447, 06/2008
HENNERON Thomas, CLENET Stéphane, DULAR Patrick, PIRIOU Francis

[39]   Analysis of a rotational single sheet tester using 3D Finite Element model taking into account hysteresis effect
The international Journal for Computation and Mathematics in Electrical and Electronic Engineering (COMPEL), Vol. 26, N°. 4, pages. 1037-1048, 08/2007, URL, Abstract
LEITE Jean Vianei, BENABOU Abdelkader, DA SILVA Pedro Armando, SADOWSKI Nelson, HENNERON Thomas, CLENET Stéphane, KUO-PENG Patrick, PIRIOU Francis, BATISTELA N.J.

The accuracy of the magnetic field strength estimation in rotational single sheet tester is investigated with the finite element method and measurements. The incorporation of a vector hysteresis model, derived from the original scalar Jiles-Atherton model, in a finite element magnetic field code is performed. The application of this method leads to use the differential reluctivity tensor that arises naturally from the vector model. The effect of the shielding on a Rotational Single Sheet Tester is analyzed in order to improve the field homogeneity in the sample area.

[40]   Source Field Computation in NDT Applications
IEEE Trans. Mag., Vol. 43, N°. 4, pages. 1785-1788, 04/2007
HENNERON Thomas, LE MENACH Yvonnick, PIRIOU Francis, CLENET Stéphane, DUCREUX Jean-Pierre

[41]   Computation of the magnetic flux in the finite elements method
European Physical Journal Applied Physics, Vol. 39, pages. 119-128, 03/2007, URL, Abstract
HENNERON Thomas, CLENET Stéphane, PIRIOU Francis

For designers, calculation of local fluxes can be very useful. In the vector potential formulation, the local fluxes can be easily deduced. In the scalar potential formulation, the determination of these fluxes presents some difficulties. In this paper, we present three methods to compute a flux through any surface in the scalar potential formulation. These are compared with the one used in the vector potential formulation for two application examples.

[42]   Calculation of Extra Copper Losses with Imposed Current Magnetodynamic Formulations
IEEE Transaction on Magnetics, Vol. 42, N°. 2, 04/2006
HENNERON Thomas, CLENET Stéphane, PIRIOU Francis

[43]   Dual Finite Element Formulations for Lumped Reluctances Coupling
IEEE Transaction on Magnetics, Vol. 41, N°. 5, 01/2005
DULAR Patrick, GYSELINCK Johan, HENNERON Thomas, PIRIOU Francis

[44]   Comparison 3D magnetodynamic formulations in term of potential with imposed electric global quantities
COMPEL, Vol. 23, N°. 4, 04/2004
HENNERON Thomas, CLENET Stéphane, PIRIOU Francis

[45]   Evaluation of 3D finite element method to study and design a soft magnetic composite machine
IEEE Transaction on Magnetics, Vol. 40, N°. 2, pages. 786-789, 04/2004
HENNERON Thomas, CLENET Stéphane, PIRIOU Francis, CROS Jérôme, VIAROUGE Philippe

[46]   3D approaches to determine the end winding inductances of a PMLSM
IEEE Trans. Mag, Vol. 38, N°. 2, pages. 989-992, 03/2004
TOUNZI Abdelmounaïm, HENNERON Thomas, LE MENACH Yvonnick, ASKOUR Rachid, DUMETZ Eric

[47]   Estimation of numerical errors due to time and space discretisation
IEEE Transactions on Magnetics, Vol. 40, N°. 2, pages. 1061 - 1064, 03/2004
HENNERON Thomas, CLENET Stéphane, PIRIOU Francis

[48]   Rotation movement based on the Spatial Fourier Interpolation Method (SFIM)
IEEE Transactions on Magnetics, A paraître, Abstract
MONTIER Laurent, CLENET Stéphane, HENNERON Thomas, GOURSAUD Benjamin

In the field of computational electromagnetics, taking into account the rotation of a sub-domain is required to simulate certain devices such as electrical machines. Several methods have been proposed in the literature, but they remain quite difficult to implement. In this paper, we propose a sliding surface method based on a spatial Fourier interpolation in order to take into account any rotation angle with a very simple numerical implementation.

[49]   Robust Model Order Reduction of an Electrical Machine at Startup through Reduction Error Estimation
International Journal of Numerical Modelling, A paraître
MONTIER Laurent, HENNERON Thomas, CLENET Stéphane, GOURSAUD Benjamin

[50]   Waveform relaxation-Newton method to determine steady state: application to three-phase transformer
The International Journal for Computation and Mathematics in Electrical and Electronic Engineering (COMPEL), Vol. 36, N°. 3, A paraître, Abstract
CARON Guillaume, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

Conférences internationales avec acte

[1]   Application of the Proper Generalized Decomposition to Solve MagnetoElectric Problem
COMPUMAG2017 (Daejeon, Corée du sud), 06/2017
HENNERON Thomas, CLENET Stéphane

[2]   Data-driven model order reduction for magnetostatic problem coupled with circuit equations
COMPUMAG 2017, Daejeon, Korea, 06/2017
PIERQUIN Antoine, HENNERON Thomas, CLENET Stéphane

[3]   Proper Generalized Decomposition Applied on a Rotating Electrical Machine
Oral session, 06/2017
MONTIER Laurent, HENNERON Thomas, CLENET Stéphane, GOURSAUD Benjamin

[4]   Nonlinear Lamination Stacks Studied with Harmonic Balance FEM combined with Homogenization approach
Compumag (International Conference on the Computation of Electromagnetic Fields), 03/2017, Abstract
ZIANI Smail, HENNERON Thomas, LE MENACH Yvonnick

Harmonic Balance Finite Element method combined with homogenization method is used to model lamination stacks. The Harmonic Balance gives directly the steady-state solution and the homogenization method reduces the number of unknowns. The numerical model takes into account the nonlinear magnetic behavior and the electric conductivity. The results of the proposed method are compared with those obtained from a classic approach.

[5]   Numerical Modeling of Steady State of Magnetostatic Problems Coupled with nonlinear Electric Circuit
Conférence CEFC 2016, Miami, 11/2016, 11/2016
CARON Guillaume, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

[6]   Nonlinear Lamination Stacks Studied with Harmonic Balance FEM Supplied by Magnetic Flux Arising from PWM
CEFC 2016, Miami, 11/2016, Abstract
ZIANI Smail, HENNERON Thomas, LE MENACH Yvonnick

The Harmonic Balance combined with the finite element method enables to obtain the steady-state solution of electromagnetic problems. In this communication, we propose to apply this approach to study a laminated iron core submitted to a magnetic flux arising from a Pulse Width Modulation (PWM) voltage. The proposed numerical model takes into account the nonlinear magnetic behaviour, the electric conductivity and a short circuit between steel sheets.

[7]   Rotation movement based on the Spatial Fourier Interpolation Method (SFIM)
CEFC 2016, 11/2016, Abstract
MONTIER Laurent, CLENET Stéphane, HENNERON Thomas, GOURSAUD Benjamin

In the field of computational electromagnetics, taking into account the rotation of a sub-domain is required to simulate certain devices such as electrical machines. We propose a sliding surface method based on a spatial Fourier interpolation in order to take into account any rotation angle with a very simple numerical implementation.

[8]   Optimization of the TEAM workshop problem 22 using POD-EIM reduced model
CEFC 2016, Miami, Florida, USA, 11/2016
PIERQUIN Antoine, BRISSET Stéphane, HENNERON Thomas, CLENET Stéphane

[9]   Comparison of DEIM and BPIM to Speed up a POD-based Nonlinear Magnetostatic Model
CEFC 2016 (Miami, USA), 11/2016
HENNERON Thomas, MONTIER Laurent, PIERQUIN Antoine, CLENET Stéphane

[10]   Parametric analysis of Magnetoharmonic problem based on Proper Generalized Decomposition
CEFC 2016 (Miami, USA), 11/2016
HENNERON Thomas, CLENET Stéphane

[11]   Structure Preserving Model Reduction of Low Frequency Electromagnetic Problem based on POD and DEIM
CEFC 2016, Miami, Florida, USA, 11/2016, Abstract
MONTIER Laurent, PIERQUIN Antoine, HENNERON Thomas, CLENET Stéphane

The Proper Orthogonal Decomposition combinedwith the (Discrete) Empirical Interpolation Method can be used to reduce the size of a numerical model. To conserve robustness, the reduced model must be constructed by preserving the structure of the full model. In this communication, an approach is proposed with potential formulations used to solve electromagnetic problems.

[12]   OFF-LINE MODEL ORDER REDUCTION FOR ON-LINE APPROACH OF LOW FREQUENCY ELECTROMAGNETIC DEVICES BASED ON POD AND (D)EI METHODS
Conférence EMI-IC (Engineering Mechanics Institute Conference, Metz, France), 10/2016
HENNERON Thomas, MONTIER Laurent, PIERQUIN Antoine, CLENET Stéphane

[13]   A coupled method between homogenization and vector potential formulations to model short-circuits in lamination stacks
MSHOM 2016, Vienna, 09/2016
ZIANI Smail, HENNERON Thomas, LE MENACH Yvonnick

[14]   Waveform Relaxation-Newton Method to determine Steady State Operation: Application to three-phase transformer
Conference EPNC 2016, Helsinki, 06/2016, Abstract
CARON Guillaume, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

This paper presents a 3-D finite element method to determine the steady state operation for magnetostatic problems coupled with electrical circuit equations. For this purpose, the waveform relaxation method combined with the Newton method (WR-NM) is developed. This method is especially suitable to long transient problems. To show the efficiency of this approach a three-phase transformer is studied. The results show that the WR-NM becomes very efficiency when the transient state is more important than about 10 periods.

[15]   Harmonic Balance Finite Element Method applied for Nonlinear Lamination stack with short circuits
EPNC 2016, Helsinki, 06/2016, Abstract
ZIANI Smail, MONTIER Laurent, HENNERON Thomas, LE MENACH Yvonnick

In this paper, the Harmonic Balance Method is used to obtain the steady-state solution of a laminated iron core with an imposed magnetic flux. The numerical model takes into account the nonlinear magnetic behaviour, the electric conductivity and a short circuit between steel sheets. The results of the Harmonic Balance Method are compared with those obtained from a classic approach.

[16]   Proper Generalized Decomposition Method Applied to Solve 3D Low Frequency Electromagnetic Field Problems
FEM2016 (Florence, Italie), 05/2016
HENNERON Thomas, CLENET Stéphane

[17]   Geometrical parametric model order reduction of transmission lines
EMF 2016, Lyon, France, 04/2016
PIERQUIN Antoine, HENNERON Thomas, LE MENACH Yvonnick, COLAS Frédéric

[18]   Waveform Relaxation Method combined with Proper Orthogonal Decomposition to solve linear magnetodynamic steady state problem coupled with electric circuit
Conférence EMF 2016, Lyon, 04/2016
CARON Guillaume, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

[19]   A method coupling a modified vector potential A* and a homogenization formulations to model short circuits in lamination stacks
EMF 2016, Lyon, 04/2016
ZIANI Smail, LE MENACH Yvonnick, HENNERON Thomas

[20]   Robust model order reduction of a nonlinear electrical machine at startup through reduction error estimation
EMF 2016, 04/2016
MONTIER Laurent, HENNERON Thomas, GOURSAUD Benjamin, CLENET Stéphane

[21]   Eddy current computation in 2D-FEM for permanent magnet loss calculation
Compumag 2015, Montreal, Canada, 07/2015
BOUGHANMI Walid, HENNERON Thomas, BENABOU Abdelkader, TOUNZI Abdelmounaïm, ZAÏM Mohamed El Hadi

[22]   Comparison of Model Order Reduction Methods like POD, CVT, Arnoldi-Krylov and PGD to solve quasistatic problems
COMPUMAG 2015, 07/2015, Abstract
MONTIER Laurent, HENNERON Thomas, GOURSAUD Benjamin, CLENET Stéphane

In the domain of numerical computation, Model Order Reduction (MOR) methods are more and more applied in mechanics and have shown their efficiency in terms of computation time and memory requirements. In computational electromagnetics, research has started recently and the different methods available in the literature need to be compared in order to find the most efficient one. We propose to evaluate MOR approaches in order to solve linear magnetoquasistatic field problems. Therefore, the Proper Orthogonal Decomposition (POD), the Centroidal Voronoi Tessellation (CVT), the Proper Generalized Decomposition (PGD) and the Arnoldi-Krylov projection (AKP) are developed and compared.

[23]   Balanced Proper Orthogonal Decomposition applied to magnetoquasistatic problems
COMPUMAG 2015, 07/2015, Abstract
MONTIER Laurent, HENNERON Thomas, GOURSAUD Benjamin, CLENET Stéphane

Model Order Reduction (MOR) methods are an active research field in the numerical analysis domain. They are applied to many different areas in physics, especially in mechanics because they allow to dramatically reduce the computational time. MOR is quite recent in electromagnetics and needs still to be investigated. The Proper Orthogonal Decomposition (POD) is the most famous one and has already shown very promising results. However, the POD approach minimizes the error in the L2 sense on the whole domain and cannot be very accurate to calculate quantities of interest, like flux associated with a probe in region where the field is low. In this communication, we present the Balanced Proper Orthogonal Decomposition (BPOD) which extends the POD by taking account of probes in its model. The BPOD and POD approaches will be compared on a 3D linear magnetoquasistatic field problem.

[24]   Multirate coupling of controlled rectifier and non-linear finite element model based on Waveform Relaxation Method
COMPUMAG 2015, Montréal, Québec, Canada, 06/2015
PIERQUIN Antoine, HENNERON Thomas, BRISSET Stéphane, CLENET Stéphane

[25]   Multidisciplinary optimization formulation to the optimization of multirate systems
COMPUMAG 2015, Montréal, Québec, Canada, 06/2015
PIERQUIN Antoine, BRISSET Stéphane, HENNERON Thomas

[26]   Application of the PGD and DEI methods to solve a Non-Linear Magnetostatic Problem coupled with the Circuit Equations
COMPUMAG 2015, Montréal, Québec, Canada, 06/2015
HENNERON Thomas, CLENET Stéphane

[27]   Space-Time Galerkin Projection of Electro-Magnetic Fields
COMPUMAG 2015, Montréal, Québec, Canada, 06/2015
WANG Zifu, HENNERON Thomas, HOFMANN Heath

[28]   Time periodicity condition of magnetostatic problem coupling with electric circuit imposed by Waveform Relaxation Method
Conférence Compumag 2015, Montreal, 06/2015, URL, Abstract
CARON Guillaume, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

In numerical computation, the finite element (FE) method associated with external electric circuits is often used to evaluate electromagnetism devices with voltage sources. To study the solution of the steady state, the computation time can be prohibitive due to a large transient state compared with the time step used to discretize the time domain. In this communication, the Waveform Relaxation Method is developed to impose the steady state of the solution in the case of magnetostatic problem coupled with electric cricuit equation.

[29]   Reduction of a Finite Element Parametric Model using Adaptive POD Methods
COMPUMAG 2015, Montréal, Québec, Canada, 06/2015
CLENET Stéphane, HENNERON Thomas, IDA Nathan

[30]   Model order reduction of single transformer based on typical engineer test-oriented POD (TETO-POD) methods
EPNC2014 (Pilsen), 07/2014
HENNERON Thomas, CLENET Stéphane

[31]   Model Order Reduction of Multi-input Non-Linear systems based on POD-DEI Methods
CEFC2014, 05/2014
HENNERON Thomas, CLENET Stéphane

[32]   Energetic Mesh-to-Mesh Projection of Magnetic Fields With Respect to Nonlinear B-H Curves
CEFC 2014, Annecy, France, 05/2014
WANG Zifu, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

[33]   Model order reduction of magnetoquasistatic problems based on POD and Arnoldi-based Krylov methods
CEFC 214, Annecy, France, 05/2014, Abstract
PIERQUIN Antoine, HENNERON Thomas, CLENET Stéphane, BRISSET Stéphane

Two model order reduction approaches are applied to reduce the computational time of a quasistatic finite element problem. Both methods are compared on an academic example.

[34]   Error estimation of POD reduced model - Application to a permanent magnet synchronous machine
CEM2014 (londres), 03/2014
HENNERON Thomas, CLENET Stéphane

[35]   Optimization process to solve multirate system
ISEF 2013, Ohrid, Macedonia, 09/2013, Abstract
PIERQUIN Antoine, BRISSET Stéphane, HENNERON Thomas, CLENET Stéphane

The modeling of a multirate system -formed by components with heteroge- neous time constants- can be done using fixed-point method. This method allows a time- discretization of each subsystem with respect to its own time constant. In an optimization process, executing the loop of the fixed-point at each model evaluation can be time consum- ing. By adding one of the searched waveform of the system to the optimization variables, the loop can be avoided. This strategy is applied to the optimization of a transformer.

[36]   Model Order Reduction of Non-Linear Magnetostatic Problems on POD and DEI Methods
compumag2013, 07/2013
HENNERON Thomas, CLENET Stéphane

[37]   Energetic Galerkin projection of electromagnetic fields between different meshes
COMPUMAG 2013 Budapest, Hungary, 07/2013, Abstract
WANG Zifu, TANG Zuqi, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

The Galerkin projection provides an useful tool to transfer electromagnetic fields between different meshes. Given an electromagnetic field calculated on the source mesh, the transfer to a different mesh can be employed for model-coupling, domain decomposition, remeshing, visualization and similar proposes. The Galerkin projection consists of calculating a target field which minimizes the interpolation error between two discretized fields. However, the $L^2$ Galerkin projection suffers from non-conservation of the electromagnetic energy. In this paper, we present an energetic approach for Galerkin projections.

[38]   Benefits of waveform relaxation method and space mapping for the optimization of multirate system
COMPUMAG 2013, Budapest, Hungary, 07/2013, Abstract
PIERQUIN Antoine, BRISSET Stéphane, HENNERON Thomas, CLENET Stéphane

For the optimization of a component from a multirate system, the article presents benefits of the joint use of several models for the optimization and of fixed-point strategy for the modeling. Thus, space mapping allows reducing time computation of an optimization process by limiting the number of evaluations of time consuming models. In the case of multirate problems, these models can be modeled by Waveform Relaxation Method to provide an additional time saving.

[39]   Comparison of implementation techniques for Galerkin projection between different meshes
EMF, 05/2013, Abstract
WANG Zifu, HENNERON Thomas, DULAR Patrick, MIPO Jean-Claude, PIRIOU Francis

Usually, coupled problems (e.g. magneto-mechanical or magneto-thermal problems) with weak interactions can be decomposed into several sub-problems and solved separately. However, in the area of finite element computation, depending on the nature of the sub-problem to solve, the used meshes generally differ. In this case, transfers of fields are required to take into account the interaction between the sub-problems. Given a previously-computed field, in order to obtain on the target mesh its approximate image, the Galerkin projection enjoys several advantages over interpolation, especially in terms of precision. This method consists of minimizing the norm of the interpolation error in the chosen target space. The accuracy of the solution is ensured by the quasi-best property of the Galerkin method. Nevertheless, in practice the general implementation of the Galerkin projection has been proved challenging. As the source and target fields are discretized on different meshes, the accurate assembly of the projection system necessitates the numeric integrating over an intermediate mesh. In practice, such an intermediate mesh can be calculated by means of intersecting the source and target meshes. However, the use of intersection requires heavy work on programming and high computation cost (P.E. Farrell and J.R. Maddison, ”Conservative interpolation between volume meshes by local Galerkin projection”, in Comput. Methods Appl. Mech Engrg, Vol. 200, pp 89-100, 2009). This proposed paper discusses the possibility to avoid mesh intersections, by using an approximate integrating algorithm. Instead of integrating over the lowest common mesh, the integrals are computed over the target mesh. Over the quadrature points of targets elements, the source solution is interpolated and approximately integrated. This is less accurate than integrating over intersections. However, the accuracy can be improved using high-oder quadrature rules. Through analytical field distributions such as skin effect current densities, we have compared this approximate method to the intersection method, on node, edge and facet Whitney elements. The robustness of the approximate method will also be studied using reciprocal projection between fine and coarse meshes. In our examples of projection on edge elements, the computation time can be reduced by a factor up to one hundred. Meanwhile, the lost accuracy is less than 0.6%. The integration of physical constraints in the projection formulation will be shown to improve coarse-to-fine-mesh projected solutions.

[40]   Waveform relaxation method and proper orthogonal decomposition approach to solve multirate electro-magnetic system
EMF 2013, Bruges, Belgium, 04/2013, Abstract
PIERQUIN Antoine, HENNERON Thomas, CLENET Stéphane, BRISSET Stéphane

In the communication, the WRM and the POD techniques are applied to study a transformer supplied by a power converter. The transformer is modeled by Finite Element Method. A reduced model of the transformer provided by the POD tech- nique is used to couple the power converter and the transformer using the WRM technique.

[41]   Model order reduction applied to the numerical study of electrical motor based on POD method
EMF2013, 04/2013
HENNERON Thomas, CLENET Stéphane

[42]   Influence of excitation on Energy bounds of dual potential formulations in magnetostatics
CEFC 2012 Oita, Japan, 11/2012
CLENET Stéphane, HENNERON Thomas

[43]   Model Order Reduction of Electromagnetic Field Problem Coupled with Electric Circuit Based on Proper Orthogonal Decomposition
OIPE, 09/2012
HENNERON Thomas, CLENET Stéphane

[44]   Proper Generalized Decomposition method applied to the magnetic simulation of a SMC microstructure
INTERMAG2012, 05/2012
HENNERON Thomas, BENABOU Abdelkader, CLENET Stéphane

[45]   Stochastic model in eddy current non destructive testing
EPE2011 (Birmingham), 09/2011
HOMBERG Charles, HENNERON Thomas, CLENET Stéphane

[46]   Interlaminar short-circuit detection: modeling of the El Cid test and comparison with the experiment
ISEF 2011 Madeira, Portugal, 09/2011, Abstract
MÜLLER Juliana-Luisa, ROMARY Raphaël, BENABOU Abdelkader, HENNERON Thomas, PIRIOU Francis, BASTOS João Pedro Assumpção, ROGER Jean-Yves

Short-circuits in turbo-generator stators can lead to a modification of the magnetic flux distribution that impact the performances and, in some extreme cases, to local damage of the iron core. This work presents the modeling of short-circuited laminations in a stator yoke of a turbo-generator. A 3D finite element (FE) model, associated to a homogenization technique, is used to calculate the short-circuit current. The results are compared with the experiment, especially for the electrical signature of the diagnosis test known as Electromagnetic Core imperfection detector (El Cid).

[47]   A TIME-DOMAIN IMPLICIT-SCHEMA DIRECT SOLVER: APPLICATION TO FINITE INTEGRATION SOLUTION
ISEF 2011, 09/2011, Abstract
WANG Zifu, LE MENACH Yvonnick, TANG Zuqi, KORECKI Julien, HENNERON Thomas

In time-domain electromagnetic fields computation, numerical methods (such as Finite Element Method (FEM), Finite Integration Technique (FIT) [1-3] and etc.) have been applied. For the time- domain integration solution, explicit and implicit schemas have been widely used. In comparison with implicit methods, the explicit methods are easier to realize in terms of computation complexity, however, they are constrained by the stability condition. This condition may require a small time step and therefore a prohibitive computing time. Another possibility is to use an implicit schema which ensures the numerical stability. Unfortunately the implicit methods require equation solved at each time step [4]. As a consequence, despite of a free choice on time step, the computation time using the full implicit methods increases. In this paper, fixed-point explicit calculation is introduced to an implicit schema. This method combines the two advantages of implicit and explicit methods: no stability condition and no equation solving. The solver is then applied to a time-domain eddy current problem. Using orthogonal mesh cells and FIT, the mass-matrices in discrete formulations are diagonal. The fixed- point explicit method allows direct calculations without matrix inversion or decomposition.

[48]   Proper Generalized Decomposition method to solve Quasi Static Field Problems
COMPUMAG2011, 07/2011
HENNERON Thomas, CLENET Stéphane

[49]   3D FE Modelling of Interlamination Short-circuits Taking into Account the Building Bar
COMPUMAG 2011 Sydney, Australie, 07/2011, Abstract
MÜLLER Juliana-Luisa, BENABOU Abdelkader, HENNERON Thomas, PIRIOU Francis, BASTOS João Pedro Assumpção, ROGER Jean-Yves

This paper deals with the modelling of a lamination stack, crossed by a conducting building bar, in the presence of an inter-lamination short-circuit. Under a timevarying magnetic flux, an induced current loop flows through both the building bar and the fault. To reduce computational times, a homogenization technique is used to model the lamination stack. Eddy current losses and total magnetic energy values are compared for cases with and without homogenization for 50 Hz and 100 Hz.

[50]   Evaluation of the overlapping finite element method for taking into account very small displacements
IGTE, 09/2010
KREBS Guillaume, TOUNZI Abdelmounaïm, HENNERON Thomas

[51]   Influence of the approximation function of the vector potential formulation with the Lagrange multipliers approach and the Mortar method
EPNC 2010, Essen, Allemange, 07/2010, Abstract
AUBERTIN Mathieu, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

In this paper, we propose to compare two types of approximation of the vector potential used to solve a magnetostatic problem in the case of the domain decompostion. The single and Lagrange multipliers approaches and the Mortar method are considered in this context.

[52]   Non-Linear Analytical Model of a Three Phase Transformer Based on 2D-FEM Identification of its Reluctances
EPNC 2010, Essen, Allemagne, 06/2010, Abstract
FRATILA Mircea, BENABOU Abdelkader, HENNERON Thomas

This paper presents a simple model to simulate the currents in a transformer, especially during the transient state. The model is based on a reluctance circuit using a finite element (FE) tool for identifying the global behaviour laws of the transformer iron core. A three-phase three-limb transformer is modelled to test the proposed approach.

[53]   Preconditioner for Mortar method applied to the FEM
CEFC 2010, 05/2010
TINZEFTE Abdellatif, AUBERTIN Mathieu, HENNERON Thomas, PIRIOU Francis

[54]   Overlapping finite elements used to connect non-conforming meshes in 3D with a vector potential formulation
CEFC 2010, 05/2010
KREBS Guillaume, HENNERON Thomas, CLENET Stéphane, LE BIHAN Yann

[55]   An approach to determine the circulation of magnetic field in FEM computation code with vector potential formulation
CEFC 2010, 05/2010
HENNERON Thomas, PIRIOU Francis

[56]   Study of Different FEM Models to Analyze Homogenized Iron Lamination with Electrical Fault
Compumag 2009, Florianopolis, Brésil, 11/2009, Abstract
MÜLLER Juliana-Luisa, BENABOU Abdelkader, HENNERON Thomas, PIRIOU Francis, BASTOS João Pedro Assumpção, ROGER Jean-Yves

In this paper we compare different approaches for the lamination stack homogenization with a short-circuit due to an electrical fault between several sheets. The presented techniques are based on the determination of a complex equivalent magnetic permeability for the homogenized domain. The eddy current losses are calculated in the homogenized lamination stack and in the fault. These losses are compared with those obtained from a reference system where the lamination is modeled with its real geometry.

[57]   Periodic and Anti-periodic boundary conditions with the Lagrange multipliers in the FEM
Compumag 2009, Florianopolis, Brésil, 11/2009
AUBERTIN Mathieu, HENNERON Thomas, PIRIOU Francis, GUERIN Pierre, MIPO Jean-Claude

[58]   Comparison between Overlapping method and Lagrange multipliers approach applied to a movement
EMF’09 (Mondovi, Italy), 05/2009
HENNERON Thomas, KREBS Guillaume, AUBERTIN Mathieu, CLENET Stéphane, PIRIOU Francis

[59]   Décomposition de domaines dans les problèmes de magnétostatique résolus par la méthode des éléments finis
Numélec 2008 Liège, 11/2008
AUBERTIN Mathieu, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude, GUERIN Pierre

[60]   Identification of a 7-phase claw-pole starter-alternator for a micro-hybrid automotive application
International Conference on Electrical Machines (ICEM08), 09/2008, Abstract
BRUYERE Antoine, HENNERON Thomas, LOCMENT Fabrice, SEMAIL Eric, BOUSCAYROL Alain

This paper deals with the identification of a new high power starter-alternator system, using both: a Finite Element Method (FEM) modeling and an elementary experimental vector control. The drive is composed of a synchronous 7-phase claw-pole machine supplied with a low voltage / high current Voltage Source Inverter (VSI). This structure needs specific approaches to plan its electrical and mechanical behaviors and to identify the parameters needed for control purpose. At first, a Finite Element Method (FEM) modeling of the machine is presented. It is used for the predetermination of the electromotive forces and of the torque. Experimental results are in good accordance with numerical results. In a second part, resistive and inductive parameters of the drive are determined by an original experimental approach that takes into account each component of the drive: the battery, the VSI and the machine.

[61]   3D Study of an Electrostatic MEMS device taking account of the active part displacement
CEFC 2008, 05/2008, Abstract
BOLONI Francisc, KREBS Guillaume, HENNERON Thomas, TOUNZI Abdelmounaïm

The analysis of micro-electro-mechanical systems (MEMS) requires to take into account both electric and mechanical phenomena. An iterative FEM approach, which involves the computation of the electrostatic field and the displacement of the moving part, is presented. The maximum displacement allows computing the pull-in voltage.

[62]   Predetermination of Currents and Field in Short-Circuit Voltage Operation for an Axial-Flux Permanent Magnet Machine
CEFC 2008 (Athene), 05/2008
HENNERON Thomas, LOCMENT Fabrice, SEMAIL Eric, PIRIOU Francis

[63]   Insulating layers in electrokinetics problem solved by the FEM
ACOMEN 2008 (Liege), 05/2008
HENNERON Thomas, CLENET Stéphane, PIRIOU Francis

[64]   Calculation of induction machine external field using both magnetodynamic potential formulations
COMPUMAG 2007, 06/2007
ALLAERT Yves-Laurent, HENNERON Thomas, CLENET Stéphane, ABAKAR Ali, MARCHAND Claude

[65]   Calcul de flux magnétique locaux avec la méthode des éléments finis
NUMELEC’06, 11/2006
HENNERON Thomas, CLENET Stéphane, PIRIOU Francis

[66]   Using 3D-FEM for design of an axial flux seven-phase machine
EMF 2006, 06/2006, Abstract
LOCMENT Fabrice, HENNERON Thomas, SEMAIL Eric, PIRIOU Francis

For the experimental seven-phase machine studied in this paper, parameters necessary for the control such as inductances and electromotive force (EMF) are sensitive to harmonics. A conventional analytical method in which only the first harmonic is taken into account does not give good results. Besides, the machine is an axial-flux one and has two asymmetrical rotors: a 3D-FEM is then necessary. Comparisons between predeterminations and experimental results show sufficient accuracy to achieve a control model.

[67]   Analysis of a rotational single sheet tester using 3d finite element model taking into account hysteresis effect
EPNC 2006, Maribor, Slovenia, 06/2006
LEITE Jean Vianei, BENABOU Abdelkader, DA SILVA Pedro Armando, SADOWSKI Nelson, HENNERON Thomas, CLENET Stéphane, KUO-PENG Patrick, PIRIOU Francis, BATISTELA N.J.

[68]   Influence of Source Fields on FEM Potential Formulations in Magnetostatics
CEFC 2006, 03/2006
HENNERON Thomas, CLENET Stéphane, BASTOS João Pedro Assumpção, PIRIOU Francis

[69]   Calculation of global quantities using incidence matrix in the A-φ formulation
CEM 2006, 02/2006
HENNERON Thomas, CLENET Stéphane, PIRIOU Francis

[70]   Study of a PM planar actuator using a permeance network model and the 3D-FEM
COMPUMAG05, 09/2005, Abstract
KREBS Guillaume, HENNERON Thomas, TOUNZI Abdelmounaïm, PAUWELS Brecht, WILLEMOT Dirk

Specific actuators are now widely used. The design and study of such a converter must be carried out using specific models. This paper deals with the study of a permanent magnet planar actuator with Multiple Degrees of Freedom (MdoF). A 3D permeance network model is used to design the actuator and study its performance. The 3D-FEM is also used to investigate more accurately the prototype behavior. A prototype of the actuator has been built. Results, given by both models are shown and compared with those obtained experimentally.

[71]   Comparison of different methods to estimate numerical errors in finite element problem coupled with external circuit equations
CEM 2004, 01/2004
HENNERON Thomas, BOUILLAULT Frédéric, CLENET Stéphane, PIRIOU Francis

[72]   Analysis of supplementary conditions for a smooth torque running of heteropolar excited Vernier Reluctance Machines
ISEF 2003, 01/2003
TAÏBI Soufiane, HENNERON Thomas, TOUNZI Abdelmounaïm

Conférences nationales avec acte

[1]   Modélisation d’empilements de tôles par une méthode de couplage entre une formulation A* spectrale et une approche homogénéisée
JCGE 2017 (Jeunes Chercheurs en Génie Electrique), 06/2017, Abstract
ZIANI Smail, HENNERON Thomas, LE MENACH Yvonnick

Nous proposons une approche de couplage entre une formulation éléments finis spectrale et une approche d’homogénéisation afin de modéliser un empilement de tôles. L’approche spectrale permet d’obtenir directement le régime permanent, l’homogénéisation permet de réduire le nombre d’inconnues et la formulation classique nous permet de prendre en compte les effets de bord des tôles. Notre approche prend en compte une loi de comportement magnétique non linéaire et une conductivité électrique dans les tôles. Les résultats de notre approche de couplage sont comparés aux résultats d’une approche classique de type éléments finis pas à pas dans le temps.

[2]   Résolution d’un problème piézoélectrique par la méthode « Proper Generalized Decomposition »
NUMELEC2015, St Nazaire, 06/2015
HENNERON Thomas, CLENET Stéphane

[3]   Réduction de modèle par POD appliquée à un transformateur planar en régime magnéto-harmonique
NUMELEC15 - St Nazaire, 06/2015, Abstract
TAYLOR Laurent, HENNERON Thomas, MARGUERON Xavier, LE MENACH Yvonnick, LE MOIGNE Philippe

La prédétermination, dans la phase de dimensionnement, des pertes et des valeurs d’inductances est nécessaire à l’élaboration de composants magnétiques performants pour l’électronique de puissance. La modélisation numérique peut être utilisée pour déterminer les caractéristiques propres d’un composant notamment lorsque sa géométrie est "complexe" ou que la fréquence d’utilisation est élevée. Ces modèles sont très précis mais le temps de simulation nécessaire est important par rapport à des modèles analytiques plus simplistes. Les méthodes de réduction de modèles, type POD ou autres, permettent de diminuer le nombre de ces simulations numériques tout en conservant une grande précision.

[4]   Approche énergétique pour la projection de champs entre deux maillages non coïncidents
Numélec 2012, 07/2012, Abstract
WANG Zifu, HENNERON Thomas, PIRIOU Francis, MIPO Jean-Claude

Une méthode de projection de champs entre deux maillages non coïncidents basée sur une approche énergétique est développée. Cette approche est proposée en magnétostatique pour les deux formulations en potentiel classiquement utilisées. Un exemple académique permet de montrer les possibilités.

[5]   Application des méthodes POD et PGD à la résolution de problèmes magnétodynamiques
NUMELEC2012, 07/2012
HENNERON Thomas, CLENET Stéphane

[6]   Une procédure pour simuler deux rotations indépendantes par la méthode Eléments Finis en 3D
EF 2009 Compiègne, 09/2009
AUBERTIN Mathieu, HENNERON Thomas, TOUNZI Abdelmounaïm

[7]   Modélisation par éléments finis de capteurs de flux pour la caractérisation de l’hystérésis en champ tournant
Proc. of MGE 2005, Lyon, France, 12/2005
BENABOU Abdelkader, HENNERON Thomas, CLENET Stéphane, PIRIOU Francis

[8]   Introduction des grandeurs globales électriques dans les formulations magnétodynamiques en potentiel
JCGE 2005, 06/2005
HENNERON Thomas

Autre publication

1]   Review on Numerical Modeling of Magnetoelectric devices
Newletters, International Compumag Society, Vol. 23, N°. 3, 11/2016
MININGER Xavier, HAKEIM Talleb, HENNERON Thomas

Conférences invités

[1]   Modelling of magneto-elastic problems on disconnected meshes
Numélec 2012 Marseille, 07/2012, Abstract
WANG Zifu, JOURNEAUX Antoine, HENNERON Thomas, BOUILLAULT Frédéric, NEMITZ Nicolas

To compute the magneto-elastic problems, a chaining of III. CALCUL DES FORCES finite element calculations is realized. The coupling term is magnetic Diverses m�thodes peuvent �tre envisag�es pour le calcul force. To compute it and realize the chaining, various methods are ana- des forces : m�thode des travaux virtuels, forces de Lorentz lyzed. The approaches are then compared to an academic example with [1, 2]. Ces diff�rentes m�thodes sont th�oriquement �quiva- analytical solution.

[2]   Accounting of different movements in the study of electomechanical devices using 3D FEM
MOMAG 2008, 09/2008
TOUNZI Abdelmounaïm, LE MENACH Yvonnick, HENNERON Thomas, KREBS Guillaume, CLENET Stéphane

[3]   Numerical solutions of electrokinetic and magnetostatic problems with imposed global quantities using FEM and FIT
MOMAG-06 (Belo-Horizonte - BRESIL), 07/2006
HENNERON Thomas, KORECKI Julien, LE MENACH Yvonnick, CLENET Stéphane, PIRIOU Francis

Thèse

[1]   Contribution à la prise en compte des grandeurs globales dans les problèmes d’électromagnétisme résolus avec la méthode des éléments finis
12/2004
HENNERON Thomas