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Saint Ouen, France

Boukenoui R.,Blida University | Bradai R.,Blida University | Bradai R.,Ecole Polytechnique de Montreal | Mellit A.,Jijel University | And 2 more authors.
2015 International Conference on Renewable Energy Research and Applications, ICRERA 2015 | Year: 2015

in this paper, a MATLAB-Simscape-based model for the simulation of a Photovoltaic (PV) generator is presented and discussed. The MPPT techniques based on Fuzzy Logic Control (FLC) are simple to be developed and can provide high efficiency in the control of the PV systems. For this purpose a detailed analysis and a comparative study have been provided for two fuzzy logic MPPT methods recently published. The first is based on a modified hill climbing-FLC and the second one is based on adaptive P&O-FLC. Moreover, The conventional P&O has been developed. The developed techniques have been simulated in the MATLAB-Simulink environment to show the method for which the performances of PV system are increased. The results obtained, revealed the performance of the adaptive P&O-FLC MPPT over the remaining examined methods with negligible static error, fast time response and high efficiency under fast variation of irradiance level. © 2015 IEEE. Source

Ghanes M.,CNRS Research Institute of Communication and Cybernetics of Nantes | DeLeon J.,Autonomous University of Nuevo Leon | Barbot J.-P.,CNRS Quartz Laboratory | Barbot J.-P.,French Institute for Research in Computer Science and Automation
Journal of the Franklin Institute | Year: 2016

In this paper, a class of time-delayed nonlinear systems with unknown parameters and unknown time-varying delays is considered. A high gain observer approach is proposed for simultaneous state observation and parameter identification. Sufficient conditions are obtained to ensure the boundedness of both observation and identification errors. Consequently a practical stability of the proposed observer is achieved. Moreover, an exponential stability of the observer is derived from the knowledge of time-delay. Simulation results are given to illustrate the performances of the proposed observer design under time-varying delay function and a piecewise unknown parameter. © 2016 The Franklin Institute. Source

Casimir J.B.,CNRS Quartz Laboratory | Khadimallah M.A.,University of Carthage | Khadimallah M.A.,Prince Sattam bin Abdulaziz University | Nguyen M.C.,Hanoi University of Science and Technology
Computers and Structures | Year: 2016

This paper describes a procedure for taking into account distributed loads in the calculation of the harmonic response of a cross-ply laminated circular cylindrical shell using the dynamic stiffness method. This work is a direct continuation of a previous work concerning isotropic materials. Equivalent loads are established on element boundaries to determine the response of the system. Therefore, the vibration analysis is solved with numerical examples in order to determine the performances of this approach. The method allows reducing both the size of the model and computing time, and ensures higher precision compared to the finite element method. © 2016 Elsevier Ltd. All rights reserved. Source

Datcu O.,Polytechnic University of Bucharest | Datcu O.,CNRS Quartz Laboratory | Stanciu M.,Polytechnic University of Bucharest | Tauleigne R.,CNRS Quartz Laboratory | And 3 more authors.
Advances in Electrical and Computer Engineering | Year: 2015

Usually, when analyzing a data series, dynamical systems theory is used to reconstruct the state space of the original system. This work aims to determine which of a chaotic system's states is best suited as output when transmitting secret messages. This is the first step prior to designing an actual communication scheme. As an example, the three states of Sprott's jerk circuit are analyzed in terms of the local observability they ensure for the original dynamics when transmitted as a scalar data series. Results show that its first two states enable accurate estimation of the transmitter's dynamics at the receiving end. However, its third state generates, in some regions of the state space, a non-invertible transformation between the original state space and the one the receiver sees. This is due to the exponential nonlinearities present in this state's derivatives. Given that these nonlinearities remain inaccessible to the receiver, they are neglected in order to allow the partial reconstruction of the dynamics of the transmitter. But, since these nonlinearities are essential for the chaotic behavior, this makes the third state unusable for cryptographic purposes. This analysis may be applied to any bipolar junction transistor or diode based chaotic circuit. © 2015 AECE. Source

Edjekouane E.,CNRS Quartz Laboratory | Khaled Y.,CNRS Quartz Laboratory | Ghanes M.,CNRS Quartz Laboratory | Barbot J.-P.,CNRS Quartz Laboratory | Barbot J.-P.,French Institute for Research in Computer Science and Automation
2015 IEEE Conference on Control and Applications, CCA 2015 - Proceedings | Year: 2015

An impulsive observer with synchronous and asynchronous measurements is investigated in this work. To prove the efficiency of this observer a simplified quarter vehicle model is used. This observer is designed to estimate the wheel slip ratio parameter λ by two measurements in the case of ABS brake systems. These measurements are the wheel rotation speed and the vehicle speed. Simulation results highlight the efficiency of the proposed impulsive observer. © 2015 IEEE. Source

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