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125 results on '"Scorretti, Riccardo"'

7. The cooperative effect of load and disorder in thermally activated rupture of a two-dimensional random fuse network

Author

Guarino, Alessio, Vanel, Loïc, Scorretti, Riccardo, and Ciliberto, Sergio

Subjects
Condensed Matter - Statistical Mechanics
Abstract

A random fuse network, or equivalently a two-dimensional spring network with quenched disorder, is subjected to a constant load and thermal noise, and studied by means of numerical simulations. Rupture is thermally activated and the lifetime follows an Arrhenius law where the energy barrier is reduced by disorder. Due to the non-homogeneous distribution of forces from the stress concentration at microcrack tips, spatial correlations between rupture events appear, but they do not affect the energy barrier's dependence on the disorder; they affect only the coupling between the disorder and the applied load.

Published
2006
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9. Failure time in the fiber-bundle model with thermal noise and disorder

Author

Politi, Antonio, Ciliberto, Segio, and Scorretti, Riccardo

Subjects
Condensed Matter - Materials Science, Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Statistical Mechanics
Abstract

The average time for the onset of macroscopic fractures is analytically and numerically investigated in the fiber-bundle model with quenched disorder and thermal noise under a constant load. We find an implicit exact expression for the failure time in the low-temperature limit that is accurately confirmed by direct simulations. The effect of the disorder is to lower the energy barrier., Comment: 11 pages, 6 figures; accepted for publication in Phys. Rev. E

Published
2002
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16. Les champs électromagnétiques basses fréquences et le corps humain

Author

Scorretti, Riccardo and Ruaux, Nathalie

Subjects
exposition professionnelle, fantôme imagerie, champ magnétique, champ électrique, dosimétrie, corps humain, [SDV.EE.SANT] Life Sciences [q-bio]/Ecology, environment/Health, mesure, électromagnétisme, modèle anatomique, simulation, basse fréquence, modélisation
Abstract

Si les effets des champs électromagnétiques basses fréquences à court terme sont relativement connus, il n’existe pas actuellement de consensus sur les effets à long terme. Dans le cadre professionnel, la réglementation impose à l’employeur de procéder à une estimation du niveau d’exposition des travailleurs, dès lors que les niveaux de champ magnétique dépassent un certain seuil. Lorsqu’il est impossible de procéder autrement, il est nécessaire de calculer le champ électromagnétique à l’intérieur même du corps humain par des techniques de dosimétrie numérique. Ces techniques consiste à réaliser des simulations avec des modèles anatomiques très détaillés du corps humain appelés « fantômes ». Or, tous les fantômes existants sont donnés dans une position figée, debout avec les bras le long du corps. Il est donc nécessaire de disposer de nouveaux outils ou modèles permettant de simuler les interactions entre l’exposition en basse fréquence (50-100 kHz) et le corps humain, en fonction des postes occupés.

Published
2022

18. Algorithms to reduce the computational cost of vector Preisach model in view of Finite Element analysis

Author

Scorretti Riccardo, Francesco Riganti-Fulginei, Antonino Laudani, Simone Quandam, Riccardo, S., Riganti Fulginei, F., Laudani, A., Quandam, S., Ampère (AMPERE), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Ampère, Département Bioingénierie (BioIng), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-École Centrale de Lyon (ECL), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Roma Tre University, and University of Perugia, Dept. of Engineering Perugia, Italy

Subjects
010302 applied physics, Reduced model, 02 engineering and technology, Finite Element analysi, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Reduced models, 0103 physical sciences, Vector Preisach model, Finite Element analysis, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The purpose of this work is to devise algorithms to reduce the memory consumption of the vector Preisach model in view of its usage in Finite Element analysis. Four algorithms, which all implement a vector Preisach hysteresis model, are presented and critically compared theoretically and by numerical experiments taken on with two materials and three signals. Several strategies are presented to reduce both the memory occupation and the computational cost of several orders of magnitude.

Published
2021
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20. Numerical dosimetry of induced phenomena in the human body by a three-phase power line

Author

Hoang, Le Ha, Scorretti, Riccardo, Burais, Noel, and Voyer, Damien

Subjects
Finite element method -- Usage, Body, Human -- Analysis, Power lines -- Usage, Radiation dosimetry -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

We computed by finite element the fields induced in an heterogeneous model of the human body by both the electric and magnetic field generated by a three-phase power line. Results were partially validated and analyzed by comparison with existing data with uniform magnetic field. Induced currents due to both E and B were developed inside the body in an asymmetrical manner. Index Terms--Dosimetry, extremely low frequency (ELF), finite-element method, human body.

Published
2009

22. Identification of Jiles--Atherton model parameters using particle swarm optimization

Author

Marion, Romain, Scorretti, Riccardo, Siauve, Nicolas, Raulet, Marie-Ange, and Krahenbuhl, Laurent

Subjects
Magnetic fields -- Measurement, Magnetic materials -- Magnetic properties, Mathematical optimization -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

This paper presents the use of the multiobjective particle swarm optimization (PSO) technique for the identification of Jiles--Atherton model parameters. This approach, implemented for the first time in order to solve this kind of problem, is tested for two magnetic materials: NO 3% SiFe and NiFe 20-80. The results are compared with those obtained with a direct search method and a genetic algorithm procedure. Experimental measures performed on both samples of materials allow us to complete and argue the validation for the PSO method. Index Terms--Genetic algorithms (GAs), magnetic field measurement, magnetic hysteresis, magnetic materials, modeling, optimization methods.

Published
2008

23. Modeling of induced current into the human body by low-frequency magnetic field from experimental data

Author

Scorretti, Riccardo, Burais, Noel, Nicolas, Laurent, and Nicolas, Alain

Subjects
Finite element method -- Research, Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The induced currents into the human body by a low-frequency magnetic field are computed using three-dimensional finite elements and a special [PHI]-A formulation. This magnetic field is generated by a real (possibly unknown) power system. The stray field is characterized by an equivalent multipole, fitted from some local measurements of the field, which is a good compromise between accuracy and number of degrees of freedom. The methodology is validated on a test-device using the software FLUX3D Index Terms--Equivalent source, finite-element method, human exposure, inverse problem, low-frequency magnetic stray fields.

Published
2005

24. Computation of the induced current density into the human body due to relative LF magnetic field generated by realistic devices

Author

Scorretti, Riccardo, Burais, Noel, Fabregue, Olivier, Nicolas, Alain, and Nicolas, Laurent

Subjects
Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A three-dimensional finite-element formulation to compute induced currents into the human body due to relative low-frequency magnetic field is described. Magnetic source field and induced currents are computed separately, allowing to handle sources due to realistic devices. This method is validated using analytical solutions over a sphere. The limit of validity of the formulation is established. Computations using an accurate model of the human body are presented. Index Terms--Bioelectric phenomena, dosimetry, quasi-static magnetic fields, three-dimensional (3-D) finite-element methods.

Published
2004

26. Travailleurs et champs électromagnétiques industriels

Author

Scorretti, Riccardo, Ampère, Département Bioingénierie (BioIng), Ampère (AMPERE), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and PNR EST

Subjects
exposition professionnelle, [SDV.EE.SANT]Life Sciences [q-bio]/Ecology, environment/Health, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, modélisation numérique, champ électromagnétique, radiofréquence, équipement industriel, dosimétrie, métrologie
Abstract

National audience; Pour protéger les travailleurs contre les risques dus aux champs électromagnétiques, la directive européenne 2013/35/UE a défini des valeurs limites d’exposition et des valeurs déclenchant l’action pour les différentes bandes de fréquences.Dans le cas des machines industrielles utilisant généralement des radiofréquences, il est parfois délicat de calculer les valeurs d’exposition des travailleurs dans l’environnement de travail.Le projet de recherche EXTI vise à étudier l’exposition des travailleurs aux champs électromagnétiques RF en milieu industriel et à mettre en place une nouvelle méthode de caractérisation de l’exposition par dosimétrie numérique.

Published
2018

40. Numerical model of static hysteresis taking into account temperature.

Author

Sixdenier, Fabien and Scorretti, Riccardo

Subjects
*STATICS, *HYSTERESIS, *MAGNETIC materials, *CURIE temperature, *NUMERICAL analysis, *PARAMETER estimation
Abstract

Abstract: Some soft magnetic materials are strongly dependent of the temperature, because of their low Curie temperature. To be able to predict their behaviour in electrical devices, hysteresis models able to take into account the temperature are needed. The vector play static hysteresis model is an interesting hysteresis model that can be modified to be able to take into account the thermal behaviour. In this paper, the temperature is taken into account in this last model through its parameters. The variations of some parameters with temperature are mainly issued from numerical interpolation and specific assumptions. Simulation results are compared to measurements and discussed. [ABSTRACT FROM AUTHOR]

Published
2018
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41. Stochastic uncertainty quantification of the eddy current in human body by using polynomial chaos decomposition

Author

Roman, Gaignaire, Scorretti, Riccardo, Sabariego, Ruth, Geuzaine, Christophe, Applied and Computational Electromagnetics [Liège] (ACE), Université de Liège-Fonds de la Recherche Scientifique [FNRS]-Institut Montefiore - Département d'Electricité, Electronique et Informatique (Liège), Ampère (AMPERE), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
polynomial chaos decomposition, Non-intrusive methods, [SPI.NRJ]Engineering Sciences [physics]/Electric power, stochastic methods, numerical dosimetry
Abstract

International audience; The finite element method can be used to compute the electromagnetic fields induced in the human body by environmental extremely low frequency (ELF) fields. However, the electric properties of tissues are not precisely known and may vary depending on the individual, his/her age and other physiological parameters. In this paper, we account for the uncertainties on the conductivities of the brain tissues and spread them out to the induced fields by means of a non-intrusive approach based on the chaos Hermite polynomial with the finite element method as a black box [1], [2]. After showing the convergence of the method, we compute the probability to be over the thresholds define by the norms.

Published
2012
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42. Numerical dosimetry of ELF fields by using dual formulations

Author

Scorretti, Riccardo, Sabariego, Ruth, Geuzaine, Christophe, Dular, Patrick, and Burais, François

Abstract

ispartof: Proceedings of the International Conference of the European Bioelectromagnetics Association (EBEA) ispartof: International Conference of the European Bioelectromagnetics Association (EBEA) location:Rome date:21 Feb - 24 Feb 2011 status: published

Published
2011

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