Saint-Étienne-du-Rouvray, France
Saint-Étienne-du-Rouvray, France
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Mhiri R.,LITIS Laboratory | Vasseur P.,LITIS Laboratory | Mousset S.,LITIS Laboratory | Boutteau R.,IRSEEM | Bensrhair A.,LITIS Laboratory
IEEE Intelligent Vehicles Symposium, Proceedings | Year: 2014

This paper presents a visual odometry with metric scale estimation of a multi-camera system in challenging un-synchronized setup. The intended application is in the field of intelligent vehicles. We propose a new algorithm named 'triangle-based' method. The proposed algorithm employs the information from both extrinsic and intrinsic parameters of calibrated cameras. We assume that the trajectory between two consecutive frames of a camera is a linear segment (straight trajectory). The relative camera poses are estimated via classical Structure-from-Motion. Then, the scale factors are computed by imposing the known extrinsic parameters and the linearity assumption. We verify the validity of our method both in simulated and real conditions. For the real world, the motion trajectory estimated for image sequence of two cameras from KITTI dataset is compared against the GPS/INS ground truth. © 2014 IEEE.

Guermouche M.,IRSEEM | Ali S.A.,IRSEEM | Langlois N.,IRSEEM
IFAC-PapersOnLine | Year: 2015

This paper develops a Super-Twisting Algorithm controller via a nonlinear disturbance observer for a DC motor system subject to matched and unmatched uncertainties. The proposed controller is based upon a novel Nonlinear Disturbance Observer structure which uses the concept of total disturbance estimation in order to estimate simultaneously the matched and the unmatched uncertainties in the system. This estimation is incorporated then in a composite observer based controller where the stability analysis is given. Simulations results illustrate the effectiveness of the proposed controller compared to other some existing control designs and show its advantages in terms of disturbance rejection, nominal performance recovery and chattering reduction. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

Dabo M.,IRSEEM | Langlois N.,IRSEEM | Chafouk H.,IRSEEM
2009 European Control Conference, ECC 2009 | Year: 2015

This paper presents a control design method based on feedback linearization applied to a turbocharged diesel engine, namely TDE. Our goal is to track desired constant values of a chosen vector output: the pressure in the intake manifold and the compressor mass flow rate instead of the air fuel ratio (AFR) and the fraction of exhaust gas recirculated (EGR) which are not accessible for measurements, see [10]. Unfortunately, the reduced-order model of TDE with these chosen outputs presents a non-minimum phase behavior. In order to solve this issue, we first make an Input-Output (IO) linearization of the nonlinear system obtained from the successive derivations of the components of the vector output with a change of coordinates, see [9]. Then, zero dynamics are linearized approximatively around a computed equilibrium point. Once this done, the I-O linearized system is extended with the approximative linearized zero dynamics. Therefore a pole placement is then applied to this linear decoupled extended system. This method presents the advantage of avoiding implicit problems of measurements, see [3],[6], [5] and [4]. Simulation results are presented to highlight the efficiency of the proposed method. © 2009 EUCA.

Coru G.,IRSEEM | Duval F.,IRSEEM | Benjelloun N.,IRSEEM | Kadi M.,IRSEEM
IEEE International Symposium on Electromagnetic Compatibility | Year: 2013

This paper presents an immunity modelling study of a 74LS04 inverter. The purpose of this work is to develop a simple model, using as little measurements as possible, and using only datasheet available data. To evaluate model precision, DPI test simulation results are compared to DPI test measurements. © 2013 EMC Europe Foundation.

Zhao L.,CNRS Material Physics Group | Normand A.,CNRS Material Physics Group | Delaroche F.,CNRS Material Physics Group | Ravelo B.,IRSEEM | Vurpillot F.,CNRS Material Physics Group
International Journal of Mass Spectrometry | Year: 2015

We propose in this paper novel approach for improving mass resolution in atom probe tomography. Using conventional counter-electrode or microelectrode design, improved mass resolution at half, tenth and 1% of the mass peak maximum is predicted when shaping properly the voltage evaporation pulse. Using a numerical approach, it is shown that a flat top voltage pulse used to trigger the field evaporation with sharp front and leading edges associated with a short tip to counter electrode distance(10 μm) strongly minimizes the energy deficits of evaporated ions from the sample, so that energy compensation devices are not necessary to obtain high mass resolution. © 2015 Elsevier B.V. All rights reserved.

Dupuis Y.,IRSEEM | Savatier X.,IRSEEM | Vasseur P.,Avenue Of Luniversite
Image and Vision Computing | Year: 2013

In this paper, we tackle the problem of gait recognition based on the model-free approach. Numerous methods exist; they all lead to high dimensional feature spaces. To address the problem of high dimensional feature space, we propose the use of the Random Forest algorithm to rank features' importance. In order to efficiently search throughout subspaces, we apply a backward feature elimination search strategy. Our first experiments are carried out on unknown covariate conditions. Our first results suggest that the selected features contribute to increase the CCR of different existing classification methods. Secondary experiments are performed on unknown covariate conditions and viewpoints. Inspired by the location of our first experiments' features, we proposed a simple mask. Experimental results demonstrate that the proposed mask gives satisfactory results for all angles of the probe and consequently is not view specific. We also show that our mask performs well when an uncooperative experimental setup is considered as compared to the state-of-the art methods. As a consequence, we propose a panoramic gait recognition framework on unknown covariate conditions. Our results suggest that panoramic gait recognition can be performed under unknown covariate conditions. Our approach can greatly reduce the complexity of the classification problem while achieving fair correct classification rates when gait is captured with unknown conditions. © 2013 Elsevier B.V.

Ouyessaad H.,IRSEEM | Chafouk H.,IRSEEM
6th Int. Conference on Integrated Modeling and Analysis in Applied Control and Automation, IMAACA 2012, Held at the International Multidisciplinary Modeling and Simulation Multiconference, I3M 2012 | Year: 2012

The objective of this paper is to detect and isolate the presence of sensor faults in dynamical systems. Unknown input observers are used which is then used to generate residuals based on the DOS observer architecture (Dedicated Observer Scheme). This diagnosis strategy is applied on the double-feed induction generator (DFIG) in wind turbines. The structure of a DOS is used for detection and isolation of multiple sensor faults. The approach is validated using signals obtained from a simulated DFIG system. The main contribution of this paper is the modelling of induction generator for wind turbines and the use unknown input observers to detect multiples and simultaneous faults in current sensors. The simulation model of DFIG is developed using MATLAB.

Zhang J.,University of Auckland | Bennouna O.,IRSEEM | Swain A.K.,University of Auckland | Nguang S.K.,University of Auckland
Proceedings of 2013 International Renewable and Sustainable Energy Conference, IRSEC 2013 | Year: 2013

This paper proposes a sliding mode observer (SMO)-based fault detection and isolation (FDI) scheme for wind turbines. The actuator faults in pitch systems of the wind turbine are transformed as sensor faults. A reduced order model of the drive train system is constructed to eliminate the effects of unknown aerodynamic rotor torque. Based on the new system representation, a bank of SMOs are designed such that the output signal can be accurately estimated in the presence of faults. The proposed method can accurately determine the location of the faults by comparing the estimated outputs with measurements. The effectiveness of the proposed FDI scheme is illustrated via simulations. © 2013 IEEE.

Yahyaoui W.,IRSEEM | Yahyaoui W.,CNRS Electrical Engineering Laboratory of Paris | Pichon L.,CNRS Electrical Engineering Laboratory of Paris | Duval F.,IRSEEM
IEEE Transactions on Magnetics | Year: 2010

The partial element equivalent circuit method (PEEC) is well suited to extract the conducted electromagnetic disturbances parameters from wiring systems. It provides an efficient tool for the EMC study relevant to automotive cables. However the complete EMC analysis of embedded systems requires also reliable models for the radiated emissions especially at high frequencies. In this paper a new approach based on the PEEC method and involving 3D field calculation is developed to evaluate emissions from radiating cables. © 2006 IEEE.

Benkaci M.,Irseem Institute Of Recherche En Systemes Electronics Embarques | Hoblos G.,IRSEEM | Langlois N.,IRSEEM
2013 10th IEEE International Conference on Networking, Sensing and Control, ICNSC 2013 | Year: 2013

Feature selection is an essential step for data classification used in fault detection and diagnosis process. In this work, a new approach is proposed which combines a feature selection algorithm and neural network tool for leaks detection and characterization tasks in diesel engine air path. The Chi2 is used as feature selection algorithm and the neural network based on Levenberg-Marquardt is used in system behavior modeling. The obtained neural network is used for leaks detection and characterization. The model is learned and validated using data generated by xMOD. This tool is used again for test. The effectiveness of proposed approach is illustrated in simulation when the system operates on a low speed/load and the considered leak affecting the air path is very small. © 2013 IEEE.

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