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La Chaussée-Saint-Victor, France

Leserf P.,ESTACALAb | De Saqui-Sannes P.,ISAE University | Hugues J.,ISAE University
IEEE International Conference on Emerging Technologies and Factory Automation, ETFA | Year: 2015

Finding the set of optimal architectures is an important challenge for the designer who uses the Model-Based System Engineering with SysML. The paper discusses the application of techniques to solve a Constraint Satisfaction Multi-criteria Optimization Problem (CSMOP) obtained from a SysML model. In this paper, we present our methodology and propose several stereotypes for model variability, including continuous and discrete variables. Then we define a new parametric diagram usage for context modeling optimization. From this optimization context and model variability, it is possible to generate a problem description file for the PyOpt optimization framework. Finally a case study combining optical and electronic parameters illustrates the methodology with numerical results. © 2015 IEEE. Source


Aubry J.,ESTACALAb | Barbedette B.,ESTACALAb
European Journal of Electrical Engineering | Year: 2014

Only physical training allows to improve the effort management on a bike. Electric bikes (e-bike, pedelec category) add a torque when travelling difficulties appear. But this facility does not manage the energy developed by the cyclist. A series hybrid type drivetrain for bikes, well known in the automotive field, is presented in this paper which improves the management of human efforts. The first results show the advantage of this solution compared to conventional self-management on the basis of a simple model of untrained cyclist behaviour. The paper argues that an energy storage device associated to series hybrid drivetrain will ensure an improved balance of the human effort management. However, the efficiency of this conversion chain must be high to maintain its benefits. In this context, a first sizing of an electric generator is introduced. © Lavoisier 2014. Source


Murzyn F.,ESTACALAb | Murzyn F.,Laval University | Mehel A.,ESTACALAb | Mehel A.,University Paris Est Creteil
International Journal of Fluid Mechanics Research | Year: 2016

The turbulent flow downstream of a single square grid is being experimentally investigated in a relatively small-sized wind tunnel. 2D LDV (Laser Doppler Velocimetry) measurements are conducted at the centerline of the channel for Reynolds numbers ranging from 8300 to 24870. Two grids are tested with two mesh sizes (M) and the solidity coefficient is always kept constant. We aim at discussing the influence of the position of virtual origin x0 on the turbulent macro (Lf ), micro (λf ) and Kolmogorov (νK) length scales. Five possible virtual origins (0 < x0=M < 8) are arbitrary chosen based on a literature review. Whatever x0=M is, we demonstrate that macro, micro and Kolmogorov length scales can be predicted by empirical laws according to some confidence intervals of 30, 20 and 15 % respectively. Comparisons with others experimental data are also provided to validate the model. Best choice for the virtual origin is also provided for the present set of experiments. © 2016 Begell House, Inc. Source


Azib T.,ESTACALAb | Hemsas K.E.,Ferhat Abbas University Setif | Larouci C.,ESTACALAb
International Review on Modelling and Simulations | Year: 2014

This paper deals with the design of energy management strategy (EMS) for a fuel cell hybrid vehicle (FCHV) with hybrid energy storage system (HESS) using energetic macroscopic representation (EMR). It discusses the design options including power, energy, and operating strategy as they relate to the energy storage system. The studied HESS is composed of battery/ultracapacitor (BAT/UC) system allowing increasing both the power capability and the energy capacity of FCHV. In order to describe the system and organize his control structure, the EMR concept is used, which is well adapted for multiphysics complex systems. EMS has been designed to control the power flow between sources and traction load, and to ensure local protections. It is based on power splitting technique in the frequency domain allowing a natural dynamics control without slop limitation to provide any load demand and to satisfy the sources inherent characteristics: FC, BAT and UC voltage and current limits are considered, as well as slow FC dynamics and HESS state of charge (SOC). Simulation results are presented to check the theoretical analysis, ensure that the system well operates under difference load conditions and demonstrate the robustness and stability of the control strategy with good tracking response. © 2014 Praise Worthy Prize S.r.l. - All rights reserved. Source


Azib T.,ESTACALAb | Bendali M.,ESTACALAb | Larouci C.,ESTACALAb | Hemsas K.E.,Ferhat Abbas University Setif
International Review of Electrical Engineering | Year: 2015

This paper presents the design of robust control strategy for an interleaved buck converter IBC for automotive application with a focus on the current sharing between cells and the fault tolerant capability in the presence of sensor faults and cell failure. The design of the controller is based on back stepping control approach and compared with a standard proportional-integral PI controller to improve fault tolerant strategy. Experimental results and simulations demonstrate the effectiveness of the proposed approach. It exhibits excellent performances and robustness under normal and fault operations. © 2015 Praise Worthy Prize S.r.l. - All rights reserved. Source

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