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Статті в журналах з теми "Estimation de défauts"
-Pirio, Francis. "Fiabilité, estimation des marges et localisation des défauts dans les systèmes sous-marins : une approche client." Revue de l'Electricité et de l'Electronique -, no. 05 (1997): 30. http://dx.doi.org/10.3845/ree.1997.058.
Повний текст джерелаTavard, C., M. Ibn Chaik, and P. Senot. "Une estimation du défaut Compton en diffusion Compton des métaux simples." Journal de Physique 50, no. 13 (1989): 1631–47. http://dx.doi.org/10.1051/jphys:0198900500130163100.
Повний текст джерелаPerron, Pierre. "L’estimation de modèles avec changements structurels multiples." Contributions économétriques 73, no. 1-2-3 (February 9, 2009): 457–505. http://dx.doi.org/10.7202/602236ar.
Повний текст джерелаJuby, Heather. "Le ménage et ses unités minimales : illustration d’un modèle de projection à l’aide de données canadiennes." Articles 24, no. 1 (March 25, 2004): 35–64. http://dx.doi.org/10.7202/010181ar.
Повний текст джерелаBumpass, Larry. "L’enfant et les transformations du milieu familial aux États-Unis." Articles 23, no. 1 (March 25, 2004): 27–52. http://dx.doi.org/10.7202/010161ar.
Повний текст джерелаLeroy, A., P. Thomas, and R. Jardri. "Activation cérébrale et récompense dans la schizophrénie : une méta-analyse des données d’IRM fonctionnelle." European Psychiatry 30, S2 (November 2015): S113. http://dx.doi.org/10.1016/j.eurpsy.2015.09.215.
Повний текст джерелаYamboué, A. T., M. Zongo, B. Traoré, O. Diallo, and C. Hanzen. "Estimation du poids du fœtus zébu peulh à partir de mesures échographiques des paramètres fœtaux." Canadian Journal of Animal Science 100, no. 4 (December 1, 2020): 739–44. http://dx.doi.org/10.1139/cjas-2020-0004.
Повний текст джерелаHANOCQ, E., L. TIPHINE, and B. BIBÉ. "Le point sur la notion de connexion en génétique animale." INRAE Productions Animales 12, no. 2 (April 30, 1999): 101–11. http://dx.doi.org/10.20870/productions-animales.1999.12.2.3869.
Повний текст джерелаWatson, J. "Status of the Golden Eagle Aquila chrysaetos in Europe." Bird Conservation International 2, no. 3 (September 1992): 175–83. http://dx.doi.org/10.1017/s0959270900002422.
Повний текст джерелаSemeki Ngabinzeke, Jean, Mikhail Pitchugin, Julie Linchant, Cédric Vermeulen, Jean-Marie Kahindo Muhongya, and Philippe Lejeune. "Une méthode simple et rapide pour l’évaluation de statistiques d’occupation du sol à l’aide d’images à très haute résolution acquises par mini-drone." BOIS & FORETS DES TROPIQUES 335 (March 15, 2018): 15. http://dx.doi.org/10.19182/bft2018.335.a31497.
Повний текст джерелаДисертації з теми "Estimation de défauts"
Farhat, Ahmad. "Détection, localisation et estimation de défauts : application véhicule." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT056/document.
Повний текст джерелаModern vehicles are increasingly equipped with new mechanisms to improve safety, comfort and ecological impact. These active systems employ sensors, actuators and automatic control systems. However, in case of failure of one these components, the consequences for the vehicle and the passengers safety could be dramatic. In order to ensure a higher level of reliability within on board diagnosis, new methodologies for sensor or actuator fault detection, location and estimation are proposed. These model based approaches are extended for robust synthesis for switched uncertain systems. In addition, a method for detecting critical stability situation is presented. The validation of the different methods is illustrated with simulations using CarSim, and application on real vehicle data within the INOVE project
Bazine, Imène. "Identification en boucle fermée de la machine asynchrone : application à la détection de défaut." Poitiers, 2008. http://theses.edel.univ-poitiers.fr/theses/2008/Ben-Ameur-Bazine/2008-Ben-Ameur-Bazine-These.pdf.
Повний текст джерелаThis thesis presents the application of a closed loop identification technique to induction machines, including explicitly the control algorithm. Basically, direct identification is asymptotically biased by output disturbances and noises which are feedback to the control input via the control algorithm. In order to get rid of this bias problem, an indirect identification technique with explicit use of the controller is proposed. Moreover, a prior knowledge of the control algorithm is replaced by its identification with the help of an overparametrized least squares techniques, which avoids knowledge of the structure and the parameters of the controller. An equivalent minimal structure controller is estimated thanks to an original criterion based on discrete moments. The identification of induction machines is performed with this equivalent controller using an output error technique. Comparative studies performed by Monte Carlo simulations have exhibited bias rejection and better precision of indirect identification, while necessary excitation is only provided by torque variations of the machine load. Finally, this new closed loop identification technique has been applied to the diagnosis of induction machines, with the benefit of better detection of stator and rotor faults, thanks to better rejection of false alarms
Touati, Youcef. "Diagnostic robuste et estimation de défauts à base de modèle Bond Graph." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10100/document.
Повний текст джерелаThis work deals with robust bond graph model-based fault diagnosis. The main objectives of this work are related to the generation of robust thresholds with respect to measurement uncertainties, and the creation of a systematic procedure for the generation of fault estimation equations. A procedure of thresholds generation based on a graphical representation of the measurement uncertainty has been developed and implemented on a real system. The Bond graph under LFT (linear fractional transformation) form has been used for the generation of fault estimation equations. These equations are used to improve the decision step concerning the isolation of the faults having the same signature and for analyzing the sensitivity of the residuals to faults affecting sensors, actuators and parameters. The algorithms developed in this work have been on a mechatronic system representing a mobile robot, called: Robotino
Zhang, Xiaoxia. "Incipient anomaly detection and estimation for complex system health monitoring." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG025.
Повний текст джерелаIncipient fault detection and diagnosis in engineering and multivariate industrial systems with a high-level noise are addressed in this Ph.D. thesis by a ’global’ non-parametric statistical approach. An incipient fault is supposed to induce an abnormal change in the measured value of the system variable. However, such change is weak, and it tends not to cause obvious changes in the signal distribution’s parameters. Especially in high noise level environment, the weak fault feature can be masked by the noise and becomes unpredictable. In such a condition, using traditional parametric-based methods generally fails in the fault detection. To cope with incipient fault detection and diagnosis, a ’global’ approach that can consider the total faults signature is needed. The incipient fault detection can be obtained by measuring the differences between the signal distributions before and after the fault occurrence. Some distribution-based ’global’ methods have been proposed, however, the detection capabilities of these existed approaches in high noise level environment should be improved. In this context, Jensen-Shannon divergence is considered a ’global’ fault indicator to deal with the incipient fault detection and diagnosis in a high noise level environment. Its detection performance for small abnormal variations hidden in noise is validated through simulation. In addition, the fault estimation problem is also considered in this work. A theoretical fault severity estimation model depending on the divergence value for the Gaussian condition is derived. The accuracy of the estimation model is evaluated on numerical models through simulations. Then, the ’global’ statistical approach is applied to two applications in engineering. The first one relates to non- destruction incipient cracks detection. The Jensen-Shannon divergence combined with Noisy Independent Component Analysis and Wavelet analysis was applied for detection and characterization of minor cracks in conductive structures with high-level perturbations based on experimental impedance signals. The second application addresses the incipient fault diagnosis in a multivariate non-linear process with a high-level noise. Tennessee Eastman Process (TEP) is one typical multivariate non-linear process, the Jensen-Shannon divergence in the Kernel Principal Component Analysis (KPCA) is developed for coping with incipient fault detection in this process
Gahlouz, Ibtiseme. "Estimation de défauts composants par un observateur à entrées inconnues : approche bond graph." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10005/document.
Повний текст джерелаThe thesis concerns the estimation of system components faults by using an unknown inputs observer. To reach this goal, we used the Bond Graph approach to physical modelling. We showed that this graphical tool is allowing the representation of system components faults as unknown inputs within the state representation of the considered physical system. The study of the causal and structural features of the system (controllability, observability, finite structure and infinite structure) based on the Bond Graph approach was hence fulfilled in order to design an unknown inputs observer which is used for the system component fault estimation. The component fault is considered as an unknown input. The approach proposed in this work wad validated through an application to a hydraulic system. The experimental results showed the effectiveness of this particular observer for the monitoring of the system components
Laboudi, Khaled. "Contribution à la détection et à l'estimation des défauts pour des systèmes linéaires à commutations." Thesis, Reims, 2017. http://www.theses.fr/2017REIMS030/document.
Повний текст джерелаThis work deals with the problem of estimation of fault and hybrid state for a classof switched linear systems. The objective is to develop a method to synthesize anobserver and an estimator dedicated respectively to the estimation of the hybridstate and the faults. After presenting a state of the art for estimation, stabilityand diagnostic techniques for switched linear systems, the report is divided intotwo parts. The first part proposes a method for estimating the continuous stateand the faults in the case where the discrete state of the system is known. Basedon a coordinate transformation which decouples a subset of the state of the systemof faults, we first synthesized a hybrid observer to estimate the continuous stateof the system and, in a second step, an estimator allowing the reconstructionof faults. The proposed fault estimator depends on the derivative of the systemoutput. For this reason, a robust and accurate differentiator based on sliding modetechniques is used. In the second part of this paper, the discrete state of the systemis assumed unknown. An algebraic approach is proposed to estimate the switchingtimes between the different subsystems. Thereafter, the estimation of the hybridstate (continuous and discrete state) and of the faults is considered in the casewhere the discrete state of the system is unknown. The latter is reconstructedfrom the estimated switching times and on a known switching sequence. Thecontinuous state of the system is estimated using a pole placement method allowingimprove the performances of the transient phase. Finally, by exploiting the resultsfound in the first part, the estimation of the faults is considered by estimatingthe output of the system with an algebraic differentiator. This differentiator givesmore interesting results at the noise compared to the differentiator based on thesliding mode techniques used in the first part
Kharrat, Dhouha. "Commande tolérante aux défauts des systèmes non linéaires : application à la dynamique du véhicule." Electronic Thesis or Diss., Amiens, 2019. http://www.theses.fr/2019AMIE0012.
Повний текст джерелаThis work deals with the development of new technologies of fault tolerant control (FTC), state and sensor/actuator faults estimation for different classes of systems. The algorithm described in this manuscript improve and reduce the conservatism of existing results in the literature. Firstly, we were interested in the synthesis of adaptive observer-based FTC for Takagi-Sugeno (T-S) descriptor systems with time-delay in presence of actuator faults. The analysis and design conditions of observer-based FTC are formulated into a set of delay-dependent linear matrix inequalities (LMIs) which can be solved in a single step. Then, an adaptive observer-based FTC strategy is proposed for both T-S descriptor systems and T-S fuzzy systems subject to simultaneous actuator and sensor faults under external disturbances. The last part of this work concerns the issue of the lateral vehicle and rollover dynamics which is approximated by the T-S fuzzy model under the influence of actuator and sensor faults with external disturbances. Using the cone complementarity linearization algorithm, the proposed method offers less restrictive LMI conditions than those established in the literature. The proposed approach is validated in simulation on the Carsim software as an application of the dynamics of the vehicle in presence of sensor, actuator faults and external disturbances
Bachir, Smaïl. "Contribution au diagnostic de la machine asynchrone par estimation paramétrique." Poitiers, 2002. http://www.theses.fr/2002POIT2306.
Повний текст джерелаBoukhari, Mohamed Riad. "Architecture de commande tolérante aux défauts capteurs proprioceptifs et extéroceptifs pour un véhicule autonome." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS029.
Повний текст джерелаDriverless vehicle offers several advantages: comfort, reduced stress, and reduced road mortality. Nevertheless, fatal accidents involving its responsibility, have highlighted its limitations and imperfections. These accidents raise questions about autonomous vehicle reliability, and voices expressed a strong concern for the safety of users of the autonomous vehicle. Furthermore, the tasks of perception and localization of autonomous vehicles may have inconsistencies leading to errors that would affect the stability of the vehicle. The sources of these inconsistencies can be of different natures and act both on the sensor itself (Hardware), or on the post-processing of information (Software). In this context, several difficulties must be overcome to secure the interaction of automated driving systems with human drivers facing these problems, the adoption of a fault-tolerant control strategy is paramount. In this thesis, a fault detection and fault tolerant control strategies for perception and localization are implemented. In addition, fault estimation strategies for proprioceptive sensors are also proposed. The purpose is to have a reliable fault localization and ensure acceptable performance. Moreover, given the unpredictability and variety of road scenes, a fault-tolerant fusion based on voting algorithms is developed for a better perception. The fusion takes advantage of current obstacle detection technologies (radio, light beam or camera detection) and the voting algorithm provides an output that is closest to reality. Tests with real data from a demonstrator vehicle are used to validate the approaches proposed in this thesis
Bara, Gabriela Iuliana. "Estimation d'état des systèmes linéaires à paramètres variants." Vandoeuvre-les-Nancy, INPL, 2001. http://www.theses.fr/2001INPL591N.
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