University Lille1

Bat., France

University Lille1

Bat., France
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Isam S.,University Lille1 | Hassan A.,University Lille1 | Mhamed S.,Lille Laboratory of Mechanics
Computers and Geotechnics | Year: 2012

This paper includes a 3D elastoplastic analysis of the influence of micropiles inclination on the seismic performances of micropiles. Analysis is carried out using a global three-dimensional modeling of the soil-micropiles-structure system. The soil behavior is described using the non-associated Mohr-Coulomb criterion. Both micropiles and the superstructure are modeled as 3D beam elements. Proper boundary conditions are used to ensure the wave transmission through the lateral boundaries of the soil mass. Analyses are first conducted for harmonic loading and then for a real earthquake record. They show that the inclination of micropiles leads to a good mobilization of their axial component and consequently to an important decrease in the shearing and bending loading. Since micropiles work mainly with the axial component, the use of inclined micropiles in seismic area presents an interesting alternative. © 2011 Elsevier Ltd.

Ambriz R.R.,National Polytechnic Institute of Mexico | Froustey C.,University of Bordeaux 1 | Mesmacque G.,University of Lille Nord de France | Mesmacque G.,University Lille1
International Journal of Impact Engineering | Year: 2013

This paper is concerned with the effect of strain rate on the tensile properties of 6061-T6 aluminum alloy welds obtained by a novel welding method called the modified indirect electric arc technique. Experimental impact tests in welded joints and base metal were carried out by means of an inertial flywheel at a constant speed of 10 m s-1. From the force-time evolution, dynamic behavior and impact fracture energy were determined in the case of base metal and welded joints. Additionally, by means of an ultra-high speed camera synchronized to the force signal, and employing digital image correlation method and monitoring markers, the true strain-time curves were obtained. These results enabled determination of the stress-strain behavior under dynamic conditions for the base metal and welded joints, which, in turn, were compared with those reported in quasi-static conditions. The strain rate does not have a strong influence on the mechanical properties of yield and tensile stress, contrasted with energy absorption capacity, which increased significantly. Finally, the effect of strain rate on the fracture surfaces was investigated. © 2013 Published by Elsevier Ltd.

Ramarotafika R.,Arts et Metiers ParisTech | Ramarotafika R.,University Lille1 | Benabou A.,University Lille1 | Clenet S.,Arts et Metiers ParisTech
IEEE Transactions on Magnetics | Year: 2012

To take account of the uncertainties introduced on the soft magnetic materials properties (magnetic behavior law, iron losses) during the manufacturing process, the present work deals with the stochastic modeling of the magnetic behavior law B-H and iron losses of claw pole stator generator. Twenty-eight samples of slinky stator (SS) coming from the same production chain have been investigated. The used approaches are similar to those used in mechanics. The accuracy of existing anhysteretic models has been tested first using cross validation techniques. The well known iron loss separation model has been implemented to take into account the variability of the losses. Then, the multivariate Gaussian distribution is chosen to model the variability and dependencies between identified parameters, for both behavior law and iron loss models. The developed stochastic models allow predicting a 98% confidence interval for the considered samples. © 2012 IEEE.

Henneron T.,University Lille1 | Clenet S.,Arts et Metiers ParisTech
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields | Year: 2014

In order to reduce the computation time and the memory resources required to solve an electromagnetic field problem, model order reduction approaches can be applied to reduce the size of the linear equation system obtained after discretisation. In the literature, the POD is widely used in engineering. In this paper, we propose to apply the POD in the case of a finite element problem accounting for the movement. The efficiency of this method is evaluated by considering an electrical motor and by comparing with the full model in terms of computational time and accuracy. Copyright © 2014 John Wiley & Sons, Ltd.

Abbadi A.,University Lille1
7th European Workshop on Structural Health Monitoring, EWSHM 2014 - 2nd European Conference of the Prognostics and Health Management (PHM) Society | Year: 2014

Efficient embedded antennas are needed for future wireless structural health monitoring. The properties of patch antennas with concrete are investigated at 860MHz. Simulations for different cases (different concrete permittivity and tangent loss) with and without the presence of steel reinforcements are performed using ANSYS HFSS software for 3-D full-wave electromagnetic field simulation and some experimental results are presented. Copyright © Inria (2014).

Bendahmane A.,University Lille1 | Vanvincq O.,University Lille1 | Mussot A.,University Lille1 | Kudlinski A.,University Lille1
Optics Letters | Year: 2013

We demonstrate that the dynamics of the soliton self-frequency shift can be accurately controlled by using tapered optical fibers with optimized longitudinal profile shape (that we term topographic fibers). The tapering profiles tailored for a targeted soliton spectral trajectory through dispersion and nonlinearity management are determined by an inverse algorithm. This control is demonstrated experimentally with topographic photonic crystal fibers fabricated directly on a drawing tower. © 2013 Optical Society of America.

Vannobel J.-M.,University Lille1
Advances in Intelligent and Soft Computing | Year: 2012

The set of focal elements resulting from a conjunctive or disjunctive combination of consonant belief functions is regretfully not consonant and is thus very difficult to represent. In this paper, we propose a graphical representation of the cross product of two focal sets originating from univariate Gaussian pdfs. This representation allows to represent initial focal intervals as well as focal intervals resulting from a combination operation. We show in case of conjunctive or disjunctive combination operations, that the whole domain can be separated in four subsets of intervals having same properties. At last, we focus on identical length focal intervals resulting from a combination. We show that such intervals are organized in connected line segments on our graphical representation. © 2012 Springer-Verlag.

Vannobel J.-M.,University Lille1
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

Much information sources model imprecision by the way of unimodal, consonant and continuous probability density functions (pdfs). We consider here in the framework of belief functions on real numbers, agents of evidence deduced from such pdfs. First are singletons plausibilities in conjunctive and disjunctive combinations proposed to basically merge agents of evidence with consonant focal elements. Second are partial and global conflict calculation methods provided. An application shows the plausibility curves and conflict values obtained in case of combination operations done on Gaussian based agents and at last, an example of conflict management based on an RCR-S adaptive rule of combination is given. © 2010 Springer-Verlag Berlin Heidelberg.

Silva L.I.,National University of Rio Cuarto | Bouscayrol A.,University Lille1 | De Angelo C.H.,National University of Rio Cuarto | Lemaire-Semail B.,University Lille1
Mechatronics | Year: 2014

This paper deals with the analysis and simulation of an electric vehicle, coupling functional and structural approaches in the same simulation environment. The Bond Graph model, the structural approach, is first deduced from the physical system, which in turn produces a direct correspondence between the system and its model. The control structure is then easily deduced from the Energetic Macroscopic Representation, the functional approach, of the vehicle using a systematic procedure. Simulation results are provided in order to analyze the performance of the closed-loop system.

Gudla V.C.,Technical University of Denmark | Jensen F.,Technical University of Denmark | Simar A.,Catholic University of Louvain | Shabadi R.,University Lille1 | Ambat R.,Technical University of Denmark
Applied Surface Science | Year: 2015

Multiple-pass friction stir processing (FSP) was employed to impregnate TiO2 (rutile) particles into the surface of an aluminium alloy. The surface composites of Al-TiO2 were then anodised in a sulphuric acid electrolyte. The effect of anodising parameters on the resulting optical appearance was investigated. Microstructural and morphological characterization was performed using scanning (SEM) and transmission electron microscopy (TEM), and X-ray diffraction (XRD). The surface appearance was analysed using an integrating sphere-spectrophotometer setup which measures the diffuse and total reflectance of light from the surface. Compared to samples without TiO2, surface appearance after anodising of samples with TiO2 changed from dark to greyish white upon increasing the anodising voltage. This is attributed to the localized microstructural and morphological differences around the TiO2 powder particles incorporated into the anodic alumina matrix. The TiO2 powder particles in the FSP zone were partially or completely amorphized during the anodising process, and also electrochemically shadowed the anodising of underlying Al matrix. © 2014 Elsevier B.V. All rights reserved.

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