Добірка наукової літератури з теми "Pronostic de durée de vie résiduelle"
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Статті в журналах з теми "Pronostic de durée de vie résiduelle":
Bralet, M. C. "Remédiation cognitive des troubles de la cognition sociale avec le programme MindReading." European Psychiatry 28, S2 (November 2013): 21–22. http://dx.doi.org/10.1016/j.eurpsy.2013.09.052.
Lakehal, Redha, Radouane Boukarroucha, Farid Aimer, Rabeh Bouharagua, Baya Aziza, Soumaya Bendjaballah, and Abdelmallek Brahami. "Surgery of cardiac Hydatid cyst: about 25 patients." Batna Journal of Medical Sciences (BJMS) 3, no. 2 (December 31, 2016): 94–97. http://dx.doi.org/10.48087/bjmsoa.2016.3208.
Gay, C. "Psychoéducation et bipolarité, vivre avec son trouble." European Psychiatry 29, S3 (November 2014): 660. http://dx.doi.org/10.1016/j.eurpsy.2014.09.042.
Courtet, P. "Une utilisation optimale des antipsychotiques au profit d’un meilleur pronostic de la schizophrénie." European Psychiatry 30, S2 (November 2015): S49—S50. http://dx.doi.org/10.1016/j.eurpsy.2015.09.139.
Pasquier, M., and M. Blancher. "Hypothermie accidentelle." Annales françaises de médecine d’urgence 9, no. 5 (April 9, 2019): 307–18. http://dx.doi.org/10.3166/afmu-2019-0152.
Medini, F., W. Homri, I. Ben Romdhane, N. Bram, and R. Labbane. "Les particularités cliniques des états mixtes." European Psychiatry 29, S3 (November 2014): 571. http://dx.doi.org/10.1016/j.eurpsy.2014.09.258.
Chabernaud, J. L. "Quelle prémédication avant la pratique des méthodes d’administration moins invasives du surfactant exogène en salle de naissance ?" Périnatalité 13, no. 3 (September 2021): 157–65. http://dx.doi.org/10.3166/rmp-2021-0132.
Logbo-Akey, Kossi Edem, Tina Kétévi, Kignomon Bingo M’Bortché, Yendoubé Pierre Kambote, Noe Kibandou Patidi, Dédé Régina Ajavon, and Abdoul-Samadou Aboubakari. "Asphyxie Périnatale à la Maternité du CHU Kara : Aspects Epidémiologique, Clinique et Pronostique." European Scientific Journal, ESJ 19, no. 30 (October 31, 2023): 323. http://dx.doi.org/10.19044/esj.2023.v19n30p323.
Sarifou, Diallo Mamadou, Diallo Abdourahmane N’Djouria, Diallo Ahmed Tidiane, Diallo Kadiatou, Diallo Djenabou, Wann Thierno Amadou, Bah Mamadou Lamine Yaya, et al. "Profil Epidémiologique des Troubles Fonctionnels Intestinaux (TFI) Persistants au CHU de Conakry." European Scientific Journal, ESJ 20, no. 3 (January 31, 2024): 243. http://dx.doi.org/10.19044/esj.2024.v20n3p243.
Дисертації з теми "Pronostic de durée de vie résiduelle":
Delmas, Adrien. "Contribution à l'estimation de la durée de vie résiduelle des systèmes en présence d'incertitudes." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2476/document.
Predictive maintenance strategies can help reduce the ever-growing maintenance costs, but their implementation represents a major challenge. Indeed, it requires to evaluate the health state of the component of the system and to prognosticate the occurrence of a future failure. This second step consists in estimating the remaining useful life (RUL) of the components, in Other words, the time they will continue functioning properly. This RUL estimation holds a high stake because the precision and accuracy of the results will influence the relevance and effectiveness of the maintenance operations. Many methods have been developed to prognosticate the remaining useful life of a component. Each one has its own particularities, advantages and drawbacks. The present work proposes a general methodology for component RUL estimation. The objective i to develop a method that can be applied to many different cases and situations and does not require big modifications. Moreover, several types of uncertainties are being dealt With in order to improve the accuracy of the prognostic. The proposed methodology can help in the maintenance decision making process. Indeed, it is possible to select the optimal moment for a required intervention thanks to the estimated RUL. Furthermore, dealing With the uncertainties provides additional confidence into the prognostic results
Shahin, Kamrul. "Modèle graphique probabiliste appliqué au diagnostic de l'état de santé des systèmes, au pronostic et à l'estimation de la durée de vie résiduelle." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0129.
This thesis contributes to prognosis and health management for assessing health condition of complex systems. In the context of operational management and operational safety of systems, we propose to investigate how Dynamic Probabilistic Graphical Modelling (DPGM) can be used to diagnose the current health state of systems, prognostic the future health state, and the evolution of degradation, as well as estimate its remaining useful life based on its operating conditions. System degradation is generally unknown and requires shutting down the system to be observed. However, this is difficult or even impossible during system operation. Though, a set of observable quantities on a system or component can characterise the level of degradation and help to estimate the remaining useful life of components and systems. The DPGM provides an approach suitable for modelling the evolution of the health state of systems and components. The aim of this thesis is to transpose and capitalize on the experience of these previous works in a prognostic context on the basis of a more efficient DPGM taking into account the available knowledge on the system. We extend the classical HMM family models to the IOHMM to allow the time propagation of uncertainty to address prognostic problems. This research includes the extension of learning and inference algorithms. Variants of the HMM model are proposed to incorporate the operating environment into the prognosis. The aim of this thesis is to contribute to solving the following scientific locks: - Considering the state of health whatever the complexity of the system by a stochastic model and learning the model parameters from the available measurements on the system. - Establish a diagnosis of the state of health of the system and the prognosis of its evolution by integrating several operational conditions. - Estimate the remaining useful life of components and structured systems with series and parallel components. This is a major challenge because the prognosis of the degradation of system components makes it possible to define strategies for either control or maintenance in relation to the residual life of the system. This allows the reduction of the probability of occurrence of a shutdown due to a system malfunction either by adjusting the degradation speed to fit in with a preventive maintenance plan or by proactively planning maintenance interventions
Duchene, Pierre. "Caractérisation non destructive des matériaux composites en fatigue : diagnostic de l’état de santé et pronostic de la durée de vie résiduelle par réseaux de neurones." Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2018. http://www.theses.fr/2018MTLD0008.
This research work consists in a new approach for non-destructive characterisation of damage in composite materials (carbon/epoxy) subjected to fatigue during self-heating tests (increasing load blocks). This approach is based on the use of several non-destructive techniques applied in-situ, in real time or delayed, whose analysis is either redundant or complementary. Six techniques were used (acoustic emission, infrared thermography, digital image correlation, acousto-ultrasound, C-scan ultrasound and lamb waves) and their post-processed results were merged using algorithms based on neural networks. The results obtained made it possible to assess and locate the damage of the material and to estimate its residual life. In doing so, several scientific advances have been obtained by, for example, carrying out a 2D localization of acoustic events using only two sensors with millimetric precision, or the development of a new pictorial acousto-ultrasonic technique allowing an control of the state of material damage at free stress conditions, ... and finally, the prognosis of the residual lifetime of the material based on a data fusion by neural networks
Aggab, Toufik. "Pronostic des systèmes complexes par l’utilisation conjointe de modèle de Markov caché et d’observateur." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2051/document.
The research presented in this thesis deals of diagnosis and prognosis of complex systems. It presents two approaches that generate useful indicators for optimizing maintenance strategies. Specifically, these approaches are used to assess the level of degradation and estimate the Remaining Useful Life of the system. The aim of these approaches is to overcome for the lack of degradation indicators. The developments are based on observers, Hidden Markov Model formalism, statistical inference methods and learning-based methods in order to characterize and predict the system operating modes. To illustrate the proposed failure diagnosis/prognosis approaches, a simulated tank level control system, an induction motor and a Li-Ion battery were used
Ammour, Rabah. "Contribution au diagnostic et pronostic des systèmes à évènements discrets temporisés par réseaux de Petri stochastiques." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMLH21/document.
Due to the increasing complexity of systems and to the limitation of sensors number, developing monitoring methods is a main issue. This PhD thesis deals with the fault diagnosis and prognosis of timed Discrete Event Systems (DES). For that purpose, partially observed stochastic Petri nets are used to model the system. The model represents both the nominal and faulty behaviors of the system and characterizes the uncertainty on the occurrence of events as random variables with exponential distributions. It also considers partial measurements of both markings and events to represent the sensors of the system. Our main contribution is to exploit the timed information, namely the dates of the measurements for the fault diagnosis and prognosis of DES. From the proposed model and collected measurements, the behaviors of the system that are consistent with those measurements are obtained. Based on the event dates, our approach consists in evaluating the probabilities of the consistent behaviors. The probability of faults occurrences is obtained as a consequence. When a fault is detected, a method to estimate its occurrence date is proposed. From the probability of the consistent trajectories, a state estimation is deduced. The future possible behaviors of the system, from the current state, are considered in order to achieve fault prediction. This prognosis result is extended to estimate the remaining useful life as a time interval. Finally, a case study representing a sorting system is proposed to show the applicability of the developed methods
Hoang, Anh. "Pronostic de la performance d’Efficacité Energétique pour la prise de décision en maintenance dans les systèmes industriels." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0086/document.
Among sustainability consideration, energy is today the key for economic growth in industrial systems. Energy resources are however limited and becomes more and more expensive. The energy optimization of manufacturing systems must therefore be considered as a major challenge to be compliant with environmental impact and management of energy resources. This should be reflected primarily by using energy efficiency (EE) as main key lever to deploy sustainability to plants, i.e. reduce the amount of energy required to provide products and services. With regards to this EE context, the aim of this thesis is to investigate the problem of considering energy efficiency and its prediction as a new indicator in maintenance decision-making. In that way, we develop first a concept of energy efficiency, called EEI (energy efficiency indicator), applicable to the different levels of abstraction of an industrial system. Then, we propose a generic formulation to evaluate the EEI (and its evolution) taking into account static and dynamic factors of influence. The temporal evolution of this indicator with respect to the degradation of the system is addressed in a predictive maintenance objective. It leads to found an energy efficiency performance concept called REEL (remaining energy-efficient lifetime), representing the residual energy lifetime. To predict the potential evolution of the IEE to calculate REEL, a generic approach based on existing predictive approaches is also developed. Next, we investigate the use of EE in CBM maintenance decision-making. Finally, all these contributions are validated on the TELMA platform
Hoang, Anh. "Pronostic de la performance d’Efficacité Energétique pour la prise de décision en maintenance dans les systèmes industriels." Electronic Thesis or Diss., Université de Lorraine, 2017. http://www.theses.fr/2017LORR0086.
Among sustainability consideration, energy is today the key for economic growth in industrial systems. Energy resources are however limited and becomes more and more expensive. The energy optimization of manufacturing systems must therefore be considered as a major challenge to be compliant with environmental impact and management of energy resources. This should be reflected primarily by using energy efficiency (EE) as main key lever to deploy sustainability to plants, i.e. reduce the amount of energy required to provide products and services. With regards to this EE context, the aim of this thesis is to investigate the problem of considering energy efficiency and its prediction as a new indicator in maintenance decision-making. In that way, we develop first a concept of energy efficiency, called EEI (energy efficiency indicator), applicable to the different levels of abstraction of an industrial system. Then, we propose a generic formulation to evaluate the EEI (and its evolution) taking into account static and dynamic factors of influence. The temporal evolution of this indicator with respect to the degradation of the system is addressed in a predictive maintenance objective. It leads to found an energy efficiency performance concept called REEL (remaining energy-efficient lifetime), representing the residual energy lifetime. To predict the potential evolution of the IEE to calculate REEL, a generic approach based on existing predictive approaches is also developed. Next, we investigate the use of EE in CBM maintenance decision-making. Finally, all these contributions are validated on the TELMA platform
Abou, Jaoude Abdo. "Advanced analytical model for the prognostic of industrial systems subject to fatigue." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4331/document.
The high availability of technological systems like aerospace, defense, petro-chemistry and automobile, is an important goal of earlier recent developments in system design technology knowing that the expensive failure can generally occur suddenly. To make the classical strategies of maintenance more efficient and to take into account the evolving product state and environment, a new analytic prognostic model is developed as a complement of existent maintenance strategies. This new model is applied to mechanical systems that are subject to fatigue failure under repetitive cyclic loading. Knowing that, the fatigue effects will initiate micro-cracks that can propagate suddenly and lead to failure. This model is based on existing damage laws in fracture mechanics, such as the crack propagation law of Paris-Erdogan beside the damage accumulation law of Palmgren-Miner. From a predefined threshold of degradation DC, the Remaining Useful Lifetime (RUL) is estimated by this prognostic model. Damages can be assumed to be accumulated linearly (Palmgren-Miner's law) and also nonlinearly to take into consideration the more complex behavior of loading and materials. The degradation model developed in this work is based on the accumulation of a damage measurement D after each loading cycle. When this measure reaches the predefined threshold DC, the system is considered in wear out state. Furthermore, the stochastic influence is included to make the model more accurate and realistic
Jha, Mayank Shekhar. "Diagnostic et Pronostic de Systèmes Dynamiques Incertains dans un contexte Bond Graph." Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0027/document.
This thesis develops the approaches for diagnostics and prognostics of uncertain dynamic systems in Bond Graph (BG) modeling framework. Firstly, properties of Interval Arithmetic (IA) and BG in Linear Fractional Transformation, are integrated for representation of parametric and measurement uncertainties on an uncertain BG model. Robust fault detection methodology is developed by utilizing the rules of IA for the generation of adaptive interval valued thresholds over the nominal residuals. The method is validated in real time on an uncertain and highly complex steam generator system.Secondly, a novel hybrid prognostic methodology is developed using BG derived Analytical Redundancy Relationships and Particle Filtering algorithms. Estimations of the current state of health of a system parameter and the associated hidden parameters are achieved in probabilistic terms. Prediction of the Remaining Useful Life (RUL) of the system parameter is also achieved in probabilistic terms. The associated uncertainties arising out of noisy measurements, environmental conditions etc. are effectively managed to produce a reliable prediction of RUL with suitable confidence bounds. The method is validated in real time on an uncertain mechatronic system.Thirdly, the prognostic methodology is validated and implemented on the electrical electro-chemical subsystem of an industrial Proton Exchange Membrane Fuel Cell. A BG of the latter is utilized which is suited for diagnostics and prognostics. The hybrid prognostic methodology is validated, involving real degradation data sets
Hervé, de Beaulieu Martin. "Identification et pronostics de l’état de santé des systèmes non linéaires par apprentissage profond. Application à la maintenance prévisionnelle des avions d’affaires." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0227.
State-of-Health prognostics is a major challenge in the predictive maintenance domain, and has been the subject of numerous studies in recent years, with particular emphasis on the use of Artificial Intelligence (AI) to improve prediction performance. However, few realistic approaches have been proposed so far that take into account the real industrial constraints, and in particular the lack of data under degradation. The aim of this PhD work is to propose an AI-based prognostics approach as realistic as possible, addressing in particular the problem of the absence of degradation data, and leveraging the available a priori knowledge. A global prognostics approach in the absence of measured degradation data is proposed. It is divided into three main stages. First of all, a hybrid data augmentation phase based on system identification coupled with the injection of a physics-based degradation model is used to generate both nominal data and degradation data. Next, an unsupervised Health Index (HI) extraction method, using the reconstruction error of an autoencoder, is used to obtain a HI from the sensor data collected on the system. Finally, a long-term HI prediction process leads to Remaining Useful Life (RUL) predictions. Some stages are first validated on an academic dataset (C-MAPSS), then the overall method is applied to a real industrial case thanks to a partnership with Dassault Aviation. The research conducted highlights the need for approaches that are realistic from an industrial point of view, taking account of real-life constraints, and the results obtained open up new opportunities for the practical use of AI in predictive maintenance