Nord-Pas-de-Calais, France

School of Advanced Engineering Studies
Nord-Pas-de-Calais, France

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Amiranashvili Sh.,Weierstrass Institute for Applied Analysis And Stochastics | Bandelow U.,Weierstrass Institute for Applied Analysis And Stochastics | Akhmediev N.,School of Advanced Engineering Studies
Optics Express | Year: 2014

It seems to be self-evident that stable optical pulses cannot be considerably shorter than a single oscillation of the carrier field. From the mathematical point of view the solitary solutions of pulse propagation equations should loose stability or demonstrate some kind of singular behavior. Typically, an unphysical cusp develops at the soliton top, preventing the soliton from being too short. Consequently, the power spectrum of the limiting solution has a special behavior: the standard exponential decay is replaced by an algebraic one. We derive the shortest soliton and explicitly calculate its spectrum for the so-called short pulse equation. The latter applies to ultra-short solitons in transparent materials like fused silica that are relevant for optical fibers. © 2014 Optical Society of America.

Libessart L.,School of Advanced Engineering Studies | Djelal C.,CNRS Civil and geo-Environmental Engineering Laboratory | De Caro P.,ENSIACET | De Caro P.,French National Institute for Agricultural Research
Construction and Building Materials | Year: 2014

The quality of the concrete facings results from the implementation of release agents and the casing surface quality. It is interesting to characterize the behaviour of release agents over the lifetime of the formwork. This study is based on the many ones test physicochemical and esthetics realized on two types of surface of formwork like on three types of applications. In complement, the ageing of the casing formwork was characterized by electrochemical spectroscopy of impedance and thanks to the correlation with the aesthetic tests will allow to find from new mechanisms to the interfaces related to the studied oil's formulations. © 2014 Elsevier Ltd. All rights reserved.

Boulkroune B.,School of Advanced Engineering Studies | Galvez-Carrillo M.,Elia System Operator | Kinnaert M.,Free University of Colombia
IEEE Transactions on Control Systems Technology | Year: 2013

The problem of multiplicative and/or additive fault detection and isolation (FDI) in the current sensors of a doubly fed induction generator (DFIG) is considered in the presence of model uncertainty. A residual generator based on the DFIG model is proposed using the structure of the classical generalized observer scheme. However, each observer in this scheme is replaced by a robust H-/H8 fault detection filter followed by a Kalman-like observer. The latter further attenuates the effect of the modeling uncertainties on the residuals. It exploits the specific pattern induced by the balanced three-phase nature of all the electric signals. It turns out that the FDI problem then amounts to detecting an abrupt change in the mean of the residual vector in the additive fault case, or the appearance of sine waves superimposed on a white noise vector in the multiplicative fault case. A decision algorithm made of a combination of generalized likelihood ratio algorithms allows us to detect and isolate the additive and multiplicative sensor faults. The complete FDI system is tested through simulations on a controlled DFIG. © 2012 IEEE.

Zhang H.,School of Advanced Engineering Studies | Saudemont C.,School of Advanced Engineering Studies | Robyns B.,School of Advanced Engineering Studies | Meuret R.,Safran Group
Mathematics and Computers in Simulation | Year: 2010

The local DC Power Distribution System of More Electric Aircraft is one of the cores of the electric power transmission. Because of some unidirectional devices (diode bridge and anti-run-back diodes), the system is not totally reversible. Some storage and dissipation systems are necessary to store or/and dissipate the returned energy to maintain the DC bus voltage and to increase the energy efficiency. This paper introduces four supervision strategies in two levels to maintain the DC bus voltage and compares these strategies with the help of two criteria: the voltage performance and efficiency. © 2010 IMACS. Published by Elsevier B.V. All rights reserved.

Gao Z.,School of Advanced Engineering Studies | Zhi C.,Japan International Center for Materials Nanoarchitectonics | Bando Y.,Japan International Center for Materials Nanoarchitectonics | Golberg D.,Japan International Center for Materials Nanoarchitectonics | Serizawa T.,Tokyo University of Science
ACS Applied Materials and Interfaces | Year: 2011

Strong and stable visible-light-emitting boron nitride nanotube (BNNT)/biomolecule nanohybrids were successfully fabricated via noncovalent functionalization of BNNTs with flavin mononucleotides (FMN). Atomic force microscopy showed excellent dispersion of the nanohybrids in aqueous solution. Infrared absorption spectroscopy revealed strong π-π stacking interactions between FMN and BNNT sidewalls. Importantly, the fluorescence spectra revealed that the nanohybrids were highly fluorescent in the visible-light spectral range. Moreover, this fluorescence had unique pH-dependent and thermally stable properties. These nanohybrids might be used to construct novel fluorescence imaging probes that function over a wide pH and temperature range. © 2011 American Chemical Society.

Abbes D.,School of Advanced Engineering Studies | Martinez A.,EIGSI | Champenois G.,University of Poitiers | Robyns B.,School of Advanced Engineering Studies
Simulation Modelling Practice and Theory | Year: 2014

This paper is focused on the design and the implementation of a hybrid PV-wind power system with batteries. It aims to emulate the behavior of a hybrid power system in order to face load consumption variations. Final system includes relevant contributions such as quality of emulator (a large number of parameters are considered); capacity to study various impacts simultaneously, a fast dynamic and a set of experimental tests that have been achieved and validated with a test bench. Moreover, a relevant supervision strategy based on currents control and batteries State Of Charge (SOC) estimation has been successfully performed despite simplicity of converter controls. © 2013 Elsevier B.V. All rights reserved.

Cimuca G.,Renault S.A. | Breban S.,Technical University of Cluj Napoca | Radulescu M.M.,Technical University of Cluj Napoca | Saudemont C.,School of Advanced Engineering Studies | Robyns B.,School of Advanced Engineering Studies
IEEE Transactions on Energy Conversion | Year: 2010

Flywheel energy storage systems (FESSs) improve the quality of the electric power delivered by wind generators, and help these generators contributing to the ancillary services. Presently, FESSs containing a flux-oriented controlled induction machine (IM) are mainly considered for this kind of application. The paper proposes the direct torque control (DTC) for an IM-based FESS associated to a variable-speed wind generator, and proves through simulation and experimental results that it could be a better alternative. This DTC application entails two specific aspects: 1) the IM must operate in the flux-weakening region, and 2) it must shift quickly and repeatedly between motoring and generating operation modes. DTC improvement for increasing the FESS efficiency, when it operates at small power values, is discussed. Some aspects concerning the flywheel design and the choice of the filter used in the FESS supervisor are also addressed. © 2010 IEEE.

Boulenguez J.,School of Advanced Engineering Studies | Berthier S.,University Paris Diderot | Leroy F.,CNRS Interdisciplinary Center on Nanoscience in Marseille
Applied Physics A: Materials Science and Processing | Year: 2012

The iridescence of Morpho rhetenor butterfly is known to result from a photonic structure on wing scales, where multilayer interference and grating diffraction occur simultaneously. We characterize the disorder at the photonic structure length scale and at the butterfly scale. We measure the scattering pattern of the wing. Through RCWA and 1st Born approximation models, we link the different disorders to different features in the scattering patterns. © 2012 Springer-Verlag.

Genty G.,Tampere University of Technology | de Sterke C.M.,University of Sydney | Bang O.,Technical University of Denmark | Dias F.,Ecole Normale Superieure de Cachan | And 2 more authors.
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2010

We discuss optical rogue wave generation in terms of collisions and turbulence processes. Simulations of picosecond pulse propagation in optical fibres show rogue soliton generation from either third-order dispersion or Raman scattering independently. Simulations of rogue soliton emergence with dispersive perturbation in the long-distance limit are also presented. © 2009 Elsevier B.V.

Abidi I.,University of Picardie Jules Verne | Bosche J.,University of Picardie Jules Verne | El Hajjaji A.,University of Picardie Jules Verne | Aitouche A.,School of Advanced Engineering Studies
2012 20th Mediterranean Conference on Control and Automation, MED 2012 - Conference Proceedings | Year: 2012

Environmental issues and respect for the European Union's objectives for green house emissions reduction, has required an improved in the sophistication of control strategies. This article focuses on the control of the air path diesel engine. Most studies consider the following control setup: intake pressure and intake air flow are controlled using EGR and VGT valves. A simple state feddback control law strategy based on a nonlinear control Lyapunov function and D-stabilisation is proposed. LMI terms have been developed. The goal is to achieve the reference tracking of desired values of intake and exhaust pressures. First at all, a description of the airpath system is given, then, the mean value model of the diesel engine is presented and converted into a Takagi-Sugeno'model. The model was validated with the AMEsim software. Finally, to ensure the performance of the proposed approach, simulation results are presented. © 2012 IEEE.

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