Didier Trichet - Academia.edu (original) (raw)
Papers by Didier Trichet
International Journal of Hydrogen Energy
Abstract This paper presents the optimization of the driving strategy of a high efficiency fuel c... more Abstract This paper presents the optimization of the driving strategy of a high efficiency fuel cell based power train. This power train is developed to equip a light duty urban-concept vehicle that runs energetic races. The objective is to go the furthest with the lowest quantity of fuel. A comprehensive dynamical model is presented, including the mechanical requirement, the thermal behavior of the fuel cell stack and the various losses and consumptions of the power train devices. This model is next integrated into a global optimization algorithm, to determine the best race strategy to be adopted. These results are validated on experimental measurements, obtained during a real race at the Shell Eco-Marathon, in 2015.
The European Physical Journal Applied Physics, 2016
IEEE Transactions on Magnetics, 2015
IEEE Transactions on Magnetics, 2015
In this paper, the Shielding (SE) and Reflecting Effectiveness (RE) of a multilayer CFRP composit... more In this paper, the Shielding (SE) and Reflecting Effectiveness (RE) of a multilayer CFRP composites is studied. To avoid the costly composites, the low concentration carbon materials, far below the percolation threshold, are used. To maintain the current circulation which is indispensable for shielding, the fiber orientations are changed between two adjacent layers. The current circulation is then calculated through the capacities between the fibers. The finite elements method is used to solve a multilayer A-V formulation of Maxwell equations. The shielding and reflecting effectiveness of a thin composite sheet are then calculated for near fields of a square loop antenna.
Contexte Développement d'actionneurs à fort couple massique pour systèmes embarqués. • Fort... more Contexte Développement d'actionneurs à fort couple massique pour systèmes embarqués. • Fortes performances spécifiques • Bas coûts de fabrication • Fiabilité Méthodologie Dimensionnement et optimisation de la machine pour des applications 10 kW, 50 tr/min (soit un Couple de 2000 Nm). Problème : Optimisation des paramètres du bobinage (Ouverture angulaire et décalage spatiale des bobines, Répartition du nombre de spires entre les bobines de la même phase) pour maximiser le coefficient de bobinage et minimiser le contenu harmonique. Machine à couplage harmonique • Diminution du nombre d'encoches • Fort contenu harmonique de la FMM du bobinage (pertes, bruit et vibrations) • Faible coefficient de bobinage But de l'étude : Développer une méthodologie qui permet, pour un nombre de pôles donné, de définir la disposition optimale du bobinage qui maximise le coefficient de bobinage et réduit le contenu harmonique de la FMM. Perspectives: Optimisation globale des machin...
Le chauffage par induction est actuellement absent dans beaucoup d'applications industrielles... more Le chauffage par induction est actuellement absent dans beaucoup d'applications industrielles, et pourtant, il a une capacité importante d'innovations technologiques dès lors qu'un apport de chaleur est nécessaire. Cette absence vient du fait que les acteurs du chauffage par induction se sont intéressés essentiellement aux applications traditionnelles d'induction pour la fusion, l'élaboration et le traitement thermique des matériaux de bonnes conductivités électrique et thermique. L'objectif de cet ouvrage Électrothermie est donc de développer des méthodologies d'analyse et de la conception des systèmes du chauffage par induction pour les matériaux peu conducteurs. Dans ce cadre, les modèles analytiques et numériques couplés des phénomènes électromagnétiques et thermiques sont utilisés pour étudier et concevoir des installations du plasma inductif, de démontrer la faisabilité d'une technique du contrôle non destructif thermo inductive, et enfin illust...
IEEE Transactions on Magnetics, 2015
IEEE Transactions on Magnetics, 2015
ABSTRACT In this paper, a model is built to evaluate the flaw detection capacity of the induction... more ABSTRACT In this paper, a model is built to evaluate the flaw detection capacity of the induction thermography applied to nondestructive testing (NDT) of carbon-fiber-reinforced polymer composite. A homogenization approach is used to overcome the large-scale factor. The homogenized electric conductivity obtained is used in a 3-D multilayer finite element model. The problem is discretized by hexahedral element to deal with the numeric instability of tetrahedron element in the modeling of thin and strongly anisotropic domain. The distribution of current in the induction coil is also considered to improve the accuracy of the solution. Numerical model is then validated by comparison with measurement. Simulation of an NDT case with induction thermography will be discussed.
Fouladgar/Electrothermics, 2012
RESUME -Les machines à aimants permanents, équipées d'un bobinage dentaire sont de plus en plus e... more RESUME -Les machines à aimants permanents, équipées d'un bobinage dentaire sont de plus en plus envisagées dans les systèmes embarquées grâce à leurs fortes performances spécifiques et à leur simplicité de fabrication. Néanmoins, elles sont caractérisées par une force magnétomotrice (FMM) riche en harmonique pouvant conduire à des pertes rotoriques, vibrations et des nuisances sonores non négligeables. Dans ce papier, une nouvelle méthode basée sur l'utilisation d'un algorithme génétique couplée à un modèle analytique de la FMM du bobinage statorique est proposée pour optimiser les paramètres intrinsèques du bobinage et ainsi réduire le contenu harmonique de la FMM. Cette méthode est utilisée pour déterminer des bobinages dentaires dont l'harmonique dominant est le cinquième harmonique. Un ensemble de bobinages optimaux est alors présenté.
ABSTRACT An original modelling of PEM fuel cell impedance is developed in our laboratory. It is b... more ABSTRACT An original modelling of PEM fuel cell impedance is developed in our laboratory. It is based on the 1D resolution in the frequency domain of the physical equations taken into account the main phenomena encountered in PEM fuel cell: electrochemical reactions, ionic transport, charge and mass transfer in cathode electrode and GDL. In the present work, the impedance model has been validated on experimental impedance measurements run on 16 cells stack (400 W maximum electrical output) where every cell impedances have been recorded simultaneously. Coupled with a dynamic physical model an accurate stack characterisation has been performed over a relative large current density range from 0.08 A/cm(2) to 0.6 A/cm(2).
2011 IEEE Vehicle Power and Propulsion Conference, 2011
In this paper, an analytic tank to wheel model of a light-duty fuel-cell vehicle is presented. Th... more In this paper, an analytic tank to wheel model of a light-duty fuel-cell vehicle is presented. This model takes into account all the elements of the vehicle along with their interactions. It is used to optimize the velocity profile of the vehicle in order to minimize the energy consumption per kilometer.
Fuel Cells, 2014
ABSTRACT This paper presents a pseudo 2D multiphysics A.C. and D.C. model that has been successfu... more ABSTRACT This paper presents a pseudo 2D multiphysics A.C. and D.C. model that has been successfully used with Electrochemical impedance spectroscopy (EIS) measurements to detect cells state-of-health in a PEMFC stack. The model is able to reproduce the gas concentration oscillations that develop along the cell channel while doing EIS measurements. This feature makes it possible to explicitly take into account the air stoichiometry effects on cells state-of health. The model being both static and harmonic, the identification of model parameters is based on static cell data (current and voltage) and on measured cells impedance spectra. The cells state-of-health is presented in terms of repartition of losses due to four limiting phenomena: the membrane ionic resistance, the mass and charge transport limitations in the electrode, the mass transport limitations through GDLs and along the cell channels and the kinetic irreversibilities. When coupled with pressure drop measurements across the stack, it has been possible to prove that flooding conditions for the stack leads to inhomogeneous cells state-of-health: on one hand, most of the cells get flooded while, on the other hand, some of them remain in the nominal conditions.
European Journal of Electrical Engineering, 2012
ABSTRACT In this paper, the detailed modelling and optimization of a power converter used on ligh... more ABSTRACT In this paper, the detailed modelling and optimization of a power converter used on light-duty fuel-cell vehicle is presented. This vehicle is a prototype car developed to run energetic races, where the main objective is to go the furthest with the lowest energy. An accurate loss model of the power converter is proposed. This model will help to identify the main sources of losses, leading to the achievement of a high efficiency power converter. This study is validated experimentally on a dynamical test bench, which emulates the vehicle behaviour on a real race track.
Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, 2010
ABSTRACT This paper presents the modeling of soft magnetic composite materials (SMC) using a non ... more ABSTRACT This paper presents the modeling of soft magnetic composite materials (SMC) using a non linear homogenization technique. This study provides useful information for the powder development and design. A new method to take into account the real geometry of the iron particles and the insulation layer is developed. This method permits to evaluate the equivalent permeability and the hysteresis losses of SMC as a function of different geometrical and physical parameters.
Fouladgar/Electrothermics, 2012
ABSTRACT This book concerns the analysis and design of induction heating of poor electrical condu... more ABSTRACT This book concerns the analysis and design of induction heating of poor electrical conduction materials. Some innovating applications such as inductive plasma installation or transformers, thermo inductive non-destructive testing and carbon-reinforced composite materials heating are studied. Analytical, semi-analytical and numerical models are combined to obtain the best modeling technique for each case. Each model has been tested with experimental results and validated. The principal aspects of a computational package to solve these kinds of coupled problems are described. In the first chapter, the mathematical tools for coupled electromagnetic and thermal phenomena are introduced. In Chapter 2, these tools are used to analyze a radio frequency inductive plasma installation. The third chapter describes the methodology of designing a low frequency plasma transformer. Chapter 4 studies the feasibility of the thermo inductive technique for non-destructive testing and the final chapter is dedicated to the use of induction heating in the lifecycle of carbon-reinforced composite materials.
International Journal of Hydrogen Energy
Abstract This paper presents the optimization of the driving strategy of a high efficiency fuel c... more Abstract This paper presents the optimization of the driving strategy of a high efficiency fuel cell based power train. This power train is developed to equip a light duty urban-concept vehicle that runs energetic races. The objective is to go the furthest with the lowest quantity of fuel. A comprehensive dynamical model is presented, including the mechanical requirement, the thermal behavior of the fuel cell stack and the various losses and consumptions of the power train devices. This model is next integrated into a global optimization algorithm, to determine the best race strategy to be adopted. These results are validated on experimental measurements, obtained during a real race at the Shell Eco-Marathon, in 2015.
The European Physical Journal Applied Physics, 2016
IEEE Transactions on Magnetics, 2015
IEEE Transactions on Magnetics, 2015
In this paper, the Shielding (SE) and Reflecting Effectiveness (RE) of a multilayer CFRP composit... more In this paper, the Shielding (SE) and Reflecting Effectiveness (RE) of a multilayer CFRP composites is studied. To avoid the costly composites, the low concentration carbon materials, far below the percolation threshold, are used. To maintain the current circulation which is indispensable for shielding, the fiber orientations are changed between two adjacent layers. The current circulation is then calculated through the capacities between the fibers. The finite elements method is used to solve a multilayer A-V formulation of Maxwell equations. The shielding and reflecting effectiveness of a thin composite sheet are then calculated for near fields of a square loop antenna.
Contexte Développement d'actionneurs à fort couple massique pour systèmes embarqués. • Fort... more Contexte Développement d'actionneurs à fort couple massique pour systèmes embarqués. • Fortes performances spécifiques • Bas coûts de fabrication • Fiabilité Méthodologie Dimensionnement et optimisation de la machine pour des applications 10 kW, 50 tr/min (soit un Couple de 2000 Nm). Problème : Optimisation des paramètres du bobinage (Ouverture angulaire et décalage spatiale des bobines, Répartition du nombre de spires entre les bobines de la même phase) pour maximiser le coefficient de bobinage et minimiser le contenu harmonique. Machine à couplage harmonique • Diminution du nombre d'encoches • Fort contenu harmonique de la FMM du bobinage (pertes, bruit et vibrations) • Faible coefficient de bobinage But de l'étude : Développer une méthodologie qui permet, pour un nombre de pôles donné, de définir la disposition optimale du bobinage qui maximise le coefficient de bobinage et réduit le contenu harmonique de la FMM. Perspectives: Optimisation globale des machin...
Le chauffage par induction est actuellement absent dans beaucoup d'applications industrielles... more Le chauffage par induction est actuellement absent dans beaucoup d'applications industrielles, et pourtant, il a une capacité importante d'innovations technologiques dès lors qu'un apport de chaleur est nécessaire. Cette absence vient du fait que les acteurs du chauffage par induction se sont intéressés essentiellement aux applications traditionnelles d'induction pour la fusion, l'élaboration et le traitement thermique des matériaux de bonnes conductivités électrique et thermique. L'objectif de cet ouvrage Électrothermie est donc de développer des méthodologies d'analyse et de la conception des systèmes du chauffage par induction pour les matériaux peu conducteurs. Dans ce cadre, les modèles analytiques et numériques couplés des phénomènes électromagnétiques et thermiques sont utilisés pour étudier et concevoir des installations du plasma inductif, de démontrer la faisabilité d'une technique du contrôle non destructif thermo inductive, et enfin illust...
IEEE Transactions on Magnetics, 2015
IEEE Transactions on Magnetics, 2015
ABSTRACT In this paper, a model is built to evaluate the flaw detection capacity of the induction... more ABSTRACT In this paper, a model is built to evaluate the flaw detection capacity of the induction thermography applied to nondestructive testing (NDT) of carbon-fiber-reinforced polymer composite. A homogenization approach is used to overcome the large-scale factor. The homogenized electric conductivity obtained is used in a 3-D multilayer finite element model. The problem is discretized by hexahedral element to deal with the numeric instability of tetrahedron element in the modeling of thin and strongly anisotropic domain. The distribution of current in the induction coil is also considered to improve the accuracy of the solution. Numerical model is then validated by comparison with measurement. Simulation of an NDT case with induction thermography will be discussed.
Fouladgar/Electrothermics, 2012
RESUME -Les machines à aimants permanents, équipées d'un bobinage dentaire sont de plus en plus e... more RESUME -Les machines à aimants permanents, équipées d'un bobinage dentaire sont de plus en plus envisagées dans les systèmes embarquées grâce à leurs fortes performances spécifiques et à leur simplicité de fabrication. Néanmoins, elles sont caractérisées par une force magnétomotrice (FMM) riche en harmonique pouvant conduire à des pertes rotoriques, vibrations et des nuisances sonores non négligeables. Dans ce papier, une nouvelle méthode basée sur l'utilisation d'un algorithme génétique couplée à un modèle analytique de la FMM du bobinage statorique est proposée pour optimiser les paramètres intrinsèques du bobinage et ainsi réduire le contenu harmonique de la FMM. Cette méthode est utilisée pour déterminer des bobinages dentaires dont l'harmonique dominant est le cinquième harmonique. Un ensemble de bobinages optimaux est alors présenté.
ABSTRACT An original modelling of PEM fuel cell impedance is developed in our laboratory. It is b... more ABSTRACT An original modelling of PEM fuel cell impedance is developed in our laboratory. It is based on the 1D resolution in the frequency domain of the physical equations taken into account the main phenomena encountered in PEM fuel cell: electrochemical reactions, ionic transport, charge and mass transfer in cathode electrode and GDL. In the present work, the impedance model has been validated on experimental impedance measurements run on 16 cells stack (400 W maximum electrical output) where every cell impedances have been recorded simultaneously. Coupled with a dynamic physical model an accurate stack characterisation has been performed over a relative large current density range from 0.08 A/cm(2) to 0.6 A/cm(2).
2011 IEEE Vehicle Power and Propulsion Conference, 2011
In this paper, an analytic tank to wheel model of a light-duty fuel-cell vehicle is presented. Th... more In this paper, an analytic tank to wheel model of a light-duty fuel-cell vehicle is presented. This model takes into account all the elements of the vehicle along with their interactions. It is used to optimize the velocity profile of the vehicle in order to minimize the energy consumption per kilometer.
Fuel Cells, 2014
ABSTRACT This paper presents a pseudo 2D multiphysics A.C. and D.C. model that has been successfu... more ABSTRACT This paper presents a pseudo 2D multiphysics A.C. and D.C. model that has been successfully used with Electrochemical impedance spectroscopy (EIS) measurements to detect cells state-of-health in a PEMFC stack. The model is able to reproduce the gas concentration oscillations that develop along the cell channel while doing EIS measurements. This feature makes it possible to explicitly take into account the air stoichiometry effects on cells state-of health. The model being both static and harmonic, the identification of model parameters is based on static cell data (current and voltage) and on measured cells impedance spectra. The cells state-of-health is presented in terms of repartition of losses due to four limiting phenomena: the membrane ionic resistance, the mass and charge transport limitations in the electrode, the mass transport limitations through GDLs and along the cell channels and the kinetic irreversibilities. When coupled with pressure drop measurements across the stack, it has been possible to prove that flooding conditions for the stack leads to inhomogeneous cells state-of-health: on one hand, most of the cells get flooded while, on the other hand, some of them remain in the nominal conditions.
European Journal of Electrical Engineering, 2012
ABSTRACT In this paper, the detailed modelling and optimization of a power converter used on ligh... more ABSTRACT In this paper, the detailed modelling and optimization of a power converter used on light-duty fuel-cell vehicle is presented. This vehicle is a prototype car developed to run energetic races, where the main objective is to go the furthest with the lowest energy. An accurate loss model of the power converter is proposed. This model will help to identify the main sources of losses, leading to the achievement of a high efficiency power converter. This study is validated experimentally on a dynamical test bench, which emulates the vehicle behaviour on a real race track.
Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, 2010
ABSTRACT This paper presents the modeling of soft magnetic composite materials (SMC) using a non ... more ABSTRACT This paper presents the modeling of soft magnetic composite materials (SMC) using a non linear homogenization technique. This study provides useful information for the powder development and design. A new method to take into account the real geometry of the iron particles and the insulation layer is developed. This method permits to evaluate the equivalent permeability and the hysteresis losses of SMC as a function of different geometrical and physical parameters.
Fouladgar/Electrothermics, 2012
ABSTRACT This book concerns the analysis and design of induction heating of poor electrical condu... more ABSTRACT This book concerns the analysis and design of induction heating of poor electrical conduction materials. Some innovating applications such as inductive plasma installation or transformers, thermo inductive non-destructive testing and carbon-reinforced composite materials heating are studied. Analytical, semi-analytical and numerical models are combined to obtain the best modeling technique for each case. Each model has been tested with experimental results and validated. The principal aspects of a computational package to solve these kinds of coupled problems are described. In the first chapter, the mathematical tools for coupled electromagnetic and thermal phenomena are introduced. In Chapter 2, these tools are used to analyze a radio frequency inductive plasma installation. The third chapter describes the methodology of designing a low frequency plasma transformer. Chapter 4 studies the feasibility of the thermo inductive technique for non-destructive testing and the final chapter is dedicated to the use of induction heating in the lifecycle of carbon-reinforced composite materials.