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Literatura académica sobre el tema "Durée de vie utile restante"
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Artículos de revistas sobre el tema "Durée de vie utile restante"
Djonkamla, Youdjari, Guy Doré y Jean-Pascal Bilodeau. "Une nouvelle approche pour prédire l’uni des chaussées flexibles pendant la durée de vie utile". Canadian Journal of Civil Engineering 44, n.º 7 (julio de 2017): 495–503. http://dx.doi.org/10.1139/cjce-2017-0015.
Texto completoLourdeau, Antoine. "Vie et mort d’un support d’outil : Chaînes opératoires de réaménagement des pièces façonnées unifacialement du technocomplexe Itaparica (Brésil Central)". Journal of Lithic Studies 4, n.º 2 (15 de septiembre de 2017): 423–46. http://dx.doi.org/10.2218/jls.v4i2.2548.
Texto completoGuillemette, François y Daniel Boisvert. "L’entrevue de recherche qualitative avec des adultes présentant une déficience intellectuelle". Recherches qualitatives 23 (28 de enero de 2022): 15–26. http://dx.doi.org/10.7202/1085577ar.
Texto completoDecambron, Adeline. "Prise en charge thérapeutique de l’arthrose chez le chat". Le Nouveau Praticien Vétérinaire canine & féline 19 (diciembre de 2022): 32–38. http://dx.doi.org/10.1051/npvcafe/2023006.
Texto completoZaccagnino, Maria, Martina Cussino, Chiara Callerame, Cristina Civilotti y Isabel Fernandez. "Anorexie mentale et EMDR : un cas clinique". Journal of EMDR Practice and Research 12, n.º 4 (noviembre de 2018): E64—E76. http://dx.doi.org/10.1891/1933-3196.12.4.e64.
Texto completoAbi-Zeid, I. y B. Bobée. "La modélisation stochastique des étiages: une revue bibliographique". Revue des sciences de l'eau 12, n.º 3 (12 de abril de 2005): 459–84. http://dx.doi.org/10.7202/705360ar.
Texto completoBaudchon, Hélène, Jérôme Creel, Vincent Touzé y Bruno Ventelou. "La politique budgétaire américaine sous la présidence Clinton : un rêve de cigale". Revue de l'OFCE 75, n.º 4 (1 de diciembre de 2000): 243–90. http://dx.doi.org/10.3917/reof.p2000.75n1.0243.
Texto completo"L'évaluation des apports positifs du recours au e-learning pendant la pandémie sur la pédagogie de FLE". Contemporaneity of Language and Literature in the Robotized Millennium 4, n.º 2 (1 de noviembre de 2022): 28–29. http://dx.doi.org/10.46632/cllrm/4/2/9.
Texto completo"Effets de trois insecticides sur la longévité, la durée de développement et le comportement de Rhynocoris albopilosus Signoret (Hétéroptères : Reduviidae)". Journal of Applied Biosciences 159 (31 de marzo de 2021): 16420–28. http://dx.doi.org/10.35759/jabs.159.6.
Texto completo"Effets de trois insecticides sur la longévité, la durée de développement et le comportement de Rhynocoris albopilosus Signoret (Hétéroptères : Reduviidae)". Journal of Applied Biosciences 159 (31 de marzo de 2021): 16420–28. http://dx.doi.org/10.35759/jabs.159.6.
Texto completoTesis sobre el tema "Durée de vie utile restante"
Rochefort, Claire. "Analyse du vieillissement, estimation de la durée de vie et méthode de surveillance de l’état de santé des condensateurs à film métallisé". Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10183.
Texto completoWidely used, the metallized film capacitors are a common cause of electronic system failure. Some of their failures can lead to serious accidents and severe damage to their surroundings, such as explosions or fires. In addition to these safety issues, the failures analysis is justified by the economic issues related to the maintenance of these systems. The objective is to estimate the remaining useful lifetime and to prevent the sudden failures. Nowadays, the most used ageing laws require performing preliminary ageing tests to identify their parameters and enable their extrapolation. These parameters strongly depend on the series and the manufacturer of the capacitor itself. For these reasons, these ageing laws are costly to use and not robust. Other types of laws based on stochastic processes and related to failure mechanisms are emerging. However, their robustness and predictive capability need to be evaluated. Finally, even if measures are implemented to reduce the occurrence of catastrophic failures, risks persist. There is a need to prevent these types of failures without solely relying on the internal characteristics and the background of the capacitors. To address these issues, this work was carried out in collaboration with Schneider Electric as part of a CIFRE contract. Several accelerated ageing tests were carried out on a total of 111 capacitors from different manufacturers. The first test campaign focused on ageing under fixed conditions of alternating voltage and temperature, while the second added the additional constraint of humidity. Post-mortem analysis revealed that the different ageing campaigns led to the prevalence of a specific type of failure mechanism. The first campaign highlighted the effects of self-healing, and the second, those of corrosion. Based on these results, models of the capacitance evolution according to these two mechanisms were established. These were validated by the data in comparison to some existing laws. A first model based on the metallization resistance degradation due to self-healing effects was also proposed. Simultaneously, a large number of thermal runaways on capacitors were observed. Through real-time health indicator measurements, an in-depth study of the process was conducted. Early signs of thermal breakdown were identified. These results enable the early detection of thermal runaway and the implementation of damage prevention measures. Based on this principle, a generic method for preventing the risk of thermal breakdown was proposed. Its feasibility has been demonstrated and experimentally evaluated
Chaoub, Alaaeddine. "Deep learning representations for prognostics and health management". Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0057.
Texto completoThis thesis contributes to the application of Deep Learning (DL) in Remaining useful life (RUL) prediction of industrial equipment, addressing significant challenges in this field. Our research is driven by the need to develop DL architectures that mitigate performance degradation under various operating conditions, to improve model interpretability, and to address data scarcity by leveraging external (un)labeled data. We structured our work into two principal parts. In the first part, we explore architectures capable of handling data variability resulting from different operating conditions, without manual feature engineering. This led us to propose an MLP-LSTM-MLP architecture. By employing an MLP at the first stage, we were able to normalize this variability, thus improving performances under such settings. Furthermore, To enhance interpretability, we proposed to replaced the first-stage MLP stage with a Gated mixture of experts (GMoE) system, enabling interpretable decomposition based on operating conditions. The second part of the thesis addresses the issue of data scarcity, a widely recognized challenge in the Prognostics and health management (PHM) field. Through the introduction of adapters, i.e. task-specific layers that address the challenge of handling multiple input/output structures, we proposed an auxiliary training approach that leverages external labeled data, presenting a method that surpasses traditional techniques found in the literature. Moreover, to utilize external unlabeled data in auxiliary training, We proposed a meta-learning approach to automatically derive auxiliary objectives from these data by pseudo-labeling them in an end-task aware manner. The goal of this part was to leverage broader spectrum of available data to improve RUL prediction performances. In reflecting upon our work, we acknowledge the limitations of the proposed approaches and suggest both immediate and long-term directions for future research. These include tackling the challenges of processing long sequence data, further improving model interpretability, addressing data scarcity with more advanced training methodologies, and exploring the potential of federated learning and large language models in industrial settings
Sylvestre, Olivier. "Influence du soulèvement au gel sur la durée de vie utile des chaussées". Master's thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/28217.
Texto completoIn cold regions, flexible pavements are constantly submitted to the effects of climate combined with the repeated traffic loads effect. The frost heave of the subgrade soils due to formation of ice lens is among the main mechanism involved in the high degradation rate of the flexible pavement. The relationship between pavement service life and the various pavement degradation mechanisms such as the soil variability, the effects of traffic, the pavement structural capacity and the effect of cracking, is complex to establish in cold regions where frost heave plays a major role in pavement deterioration. The main goal of this project is to present the development of flexible pavement damage models, developed through a multiple linear regression analysis, associating the long-term roughness performance to frost heave and several degradation mechanisms. At a design stage, those models would be essential to evaluate the benefits or consequences to have a frost heave lower, equal or higher than the allowable threshold values established by the Ministère des Transports, de la Mobilité Durable et de l’Électrification des Transports (MTMDET) du Québec according to the roads functional classification. The result illustrated that a significant increase in long-term IRI deterioration rate, usually caused by a more variable subgrade soil, is likely to contribute to the rehabilitation of the pavements before the end of the initial pavement service life. This project will allow the road administrations and contractors to adapt the designs of road infrastructure subjected to frost action according to their needs and design objectives, and to better understand to effect of frost heave on pavement deterioration.
Ouhab, Merouane. "Estimation de Durée de Vie Restante de Modules de Puissance en Fonctionnement dans des Convertisseurs Industriels". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN047.
Texto completoThe motor drive is one of the most used power converters in industry; it drives pumps, fans, conveyers, elevators …etc. In this conversion systems, power modules integrating IGBT devices represent the core part in the AC/AC electrical energy conversion. During operation, they are subjected to severe functional and environmental conditions (temperature cycles, humidity, vibrations …etc.). Due to the dissipated power at the level of their devices (IGBTs and diodes), the module undergoes deformations of a thermomechanical origin, which accumulate over time limiting its lifetime and impacting on its reliability. Therefore, manufacturers are not faced only with the development of robust and reliable components, but above all they need to be able to develop tools for maintenance phases scheduling. In this scope, the thesis work is focused. During it, we try to bring a solution to this need, so we propose a remaining lifetime prediction methodology for an integrated power module inside a 15kW motor drive.Therefore, we develop a remaining lifetime model that requires an electrothermal modeling of the system, a temperature cycles counting algorithm called by the Rainflow and a lifetime law obtained from the aging tests. The lifetime parameter is then calculated by applying the Miner’s rule. Finally, we propose strategies to take into account the degradation effect on this model
Wang, Chu. "Deep learning-based prognostics for fuel cells under variable load operating conditions". Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0530.
Texto completoProton exchange membrane fuel cell (PEMFC) systems are suitable for various transportation applications thanks to their compact structure, high power density, low start/running temperature, and zero carbon emissions. High cost and lack of durability of PEMFC are still the core factors limiting their large-scale commercialization. In transportation applications, the deterioration of PEMFCs is aggravated by variable load conditions, resulting in a decrease in their Remaining Useful Life (RUL). Prognostics and health management (PHM) is an effective tool to forecast potential system risks, manage system control/maintenance schedules, improve system safety and reliability, extend system life, and reduce operation/maintenance costs. Prognostics is an important foundation and key support for PHM, and its core tasks include health indicator extraction, degradation trend prediction, and RUL estimation. The long-term degradation characteristics of PEMFC are concealed in variable load conditions, which increases the difficulty of health indicator extraction, reduces the accuracy of degradation prediction, and inhibits the reliability of life estimation. In view of this, the thesis work starts from modeling the degradation behavior of PEMFC under variable load conditions and carries out research work on health indicator extraction, short/long-term degradation trend prediction, RUL estimation and reliability evaluation
Nechad, Hanane. "Evaluation de l'endommagement et de la rupture de matériaux hétérogènes par ultrasons et émission acoustique : estimation de la durée de vie restante". Lyon, INSA, 2004. https://theses.insa-lyon.fr/publication/2004ISAL0040/these.pdf.
Texto completoBehaviour in creep and identification of the damage mechanisms of composite materials as glass/polyester unidirectional, with cross ply and SMC (sheet moulding compound), are studied in situ by acoustic emission (AE) and ultrasounds. The analysis of the signals of AE made it possible for certain materials to identify the damage mechanisms. The follow-up of the mechanical properties in creep through the longitudinal ultrasonic velocity is measured in situ. The loss of stiffness determined from ultrasonic velocity measurements observed and its good correlation with the AE testify to the capacity of the two methods to follow the damage and consolidate the idea of a global solution for health control of materials. In addition, we observed during primary creep a relaxation in power law (Andrade’s law) for the strain rate and AE rate (Omori’s law). Tertiary creep as for it, is characterized by a singularity in power law of the strain rates and AE culminating with the total rupture of materials. Interesting correlations were observed between some characteristics of the primary creep and tertiary regime, in particular between the time of rupture tc and the transition time of primary, secondary and tertiary creep tm. This significant result shows the bonds between the two modes and makes it possible to consider a means of prediction of the rupture. These experimental results are supported by a model derived from the democratic model of fibres called DFBM (Democratic fibre bundle model) in which the material is represented by a series of elements constituted of a spring assembled in parallel with a nonlinear shock absorber of viscosity of Eyring type. This model permits to explain the correlation between tc and tm and makes it possible to find again relaxation with andrade law in primary creep and the singularity of power law in tertiary creep with critical exponents of the same order as those observed in experiments
Darwiche, Mohamad. "Apprentissage statistique pour l'évaluation et le contrôle non destructifs : application à l'estimation de la durée de vie restante des matériaux par émission acoustique sous fluage". Phd thesis, Université du Maine, 2013. http://tel.archives-ouvertes.fr/tel-01019999.
Texto completoMarec, Anne. "Contrôle de santé des matériaux hétérogènes par émission acoustique et acoustique non linéaire : discrimination des mécanismes d’endommagement et estimation de la durée de vie restante". Le Mans, 2008. http://cyberdoc.univ-lemans.fr/theses/2008/2008LEMA1012.pdf.
Texto completoLocal damage in glass/epoxy and glass/polyester composite materials is investigated with the analysis of the signals of acoustic emission (AE). Unsupervised pattern recognition analyses (fuzzy c-means clustering) associated with a principal component analysis are the tools used for the classification of the monitored AE events. A cluster analysis of AE data is achieved and the resulting clusters are correlated to the damage mechanisms of the material under investigation. The proposed method also shows the time evolution of different damage mechanisms till the global failure. Thus the most critical damage mechanisms are identified. After being validated on model samples composed of unidirectional composites, this method is applied to actual composites such as cross-ply composites, sheet molding compound (SMC) and polymer concretes damaged with tensile, creep and three-point bending tests. Furthermore, AE signals generated by heterogeneous materials are not stationary. Thus, continuous and discrete wavelet transforms are applied on typical damage mechanisms AE signals such as matrix cracking, debonding, fiber failure. Time-scale descriptors are defined from these wavelets and are introduced in the classification process. They provide a better discrimination of damage mechanisms than some time-based descriptors for more complex composite materials. Finally, gradually damaged SMC composite materials are experimented with nonlinear slow dynamics tests. Nonlinear slow dynamics have been found to be very sensitive to damage evolution. Clustering of AE signals enables to understand the contribution of the different damage mechanisms to the evolution of the nonlinear behavior of damaged SMC
Bankati, Wabi Réné. "Gestion d'énergie des systèmes multi-piles à combustible basée sur les pronostics de durées de vie restantes pour une application au transport automobile". Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCD006.
Texto completoThe global warming’s effects, such as the increase in the earth’s surface average temperature, the progressive remoteness of climatic extremes, the increase in the average water level of seas and oceans, etc., are only the consequences of the human-induced accumulation of greenhouse gasses (GHGs) in the atmosphere. At the global level, some economic sectors contribute more to this phenomenon than others. This is particularly true for the transport sector, which is responsible for 25% of global GHG emissions, according to the IEA 2020 report. This percentage makes the transport sector the most polluting economic sector after electric generation. A more detailed statistical analysis of transportation emissions shows that road transport is the most GHG-emitting transportation mode. According to the report published in 2020 by « INSEE, France » and the national inventory report 1990-2019 of « Environment and Climate Change, Canada », 94% and 70% of transportation emissions are respectively attributed to road traffic in France and in Canada.To reduce the carbon footprint of road transport, using hydrogen-powered vehicles, also known as fuel cell hybrid electric vehicles (FCHEV) seems to be a very attractive idea and a complement to electric vehicles. However, besides the lack of hydrogen refueling infrastructures, there are some technological barriers such as the short lifetime of fuel cells, the main power source of FCHEV, that slow down the commercialization of these vehicles.The concept of modular power system for fuel cells, which was introduced in the literature ten years ago, is particularly interesting because it can improve the lifetime, fault tolerance, and energy efficiency of fuel cell systems. The basic idea of this concept is to combine several low power fuel cell modules (short stack + auxiliary units) instead of using a single high power fuel cell module. In this case, a multi-fuel cell stack (MFCS) system is obtained and the main challenge to overcome is the development of an appropriate energy management strategy (EMS). In fact, energy management is an essential element on which all the performances that an MFCS system can offer depend.Some great achievements have been made over the past decade in certain research areas, such as PHM « prognostic and health management », to enable EMS for MFCS systems to make appropriate energy management decisions regarding the lifetime of these systems. However, to date, very few prognostic-based EMS are developed in the literature. To this end, a remaining useful life (RUL) prediction-based EMS is proposed in this thesis for MFCS systems in the context of an automotive application.The proposed EMS was validated by simulations in Matlab/Simulink environment on an MFCS system consisting of four 500-W using the class 3 of the Worldwide harmonized Light vehicles Test Procedure (WLTP). A comparative study of the MFCS system performance under the proposed EMS and the conventional EMS showed that the proposed EMS can achieve a lifetime for the MFCS system that is more than 2.35 times greater than the one that could be reached under conventional EMS. All this while keeping its hydrogen consumption at a very reasonable level compared to the amount of hydrogen consumed with the conventional EMS
Foulard, Stéphane. "Online and real-time load monitoring for remaining service life prediction of automotive transmissions : damage level estimation of transmission components based on a torque acquisition". Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0012.
Texto completoThis research work proposes the development and the validation of an online and real-time method to predict the remaining service life of the gearwheels of automotive transmissions, with the aim of implementing it on standard control units of series-production vehicles. By focusing on the proposition of a simple, reliable and easy-to-implement solution, the system relies on the combination of an acquisition method of the torques acting in the transmission and a continuous estimation of the damage levels of the gearwheels. Firstly, a state of the art and the theoretical basics are presented concerning a damage estimation based on a nominal stress concept and a linear damage accumulation. The global structure of the damage estimation algorithm is then analyzed and the methodological approach adopted for its development is explained. This is based in principal on a drivetrain model, validated with tests and measurements, where a particular attention is paid to the representation of the gear shifts and the transmission dynamics. Two types of transmissions are considered, namely a standard manual transmission and a dual clutch transmission mounted in series-production cars. Respectively a requirement analysis for the configuration of the algorithm as well as a requirement specification for the torque acquisition method are performed. On this basis, a state observer is developed and validated, which is able to reconstruct the clutch torque and the transmission output torque. Finally, a synthesis of the complete method and the final version of the algorithm are addressed, and the economic and ecological advantages of the introduction of the method in the context of lightweight design measures are discussed and evaluated
Kurzfassung Diese Dissertation beschreibt die Entwicklung einer Online- und Echtzeit-Methode zur Vorhersage der restlichen Lebensdauer von den Zahnradern eines Kraftfahrzeuggetriebes. Diese Methode ist fur eine Implementierung auf Standard-Steuergeraten vorgesehen. Durch die Fokussierung auf eine einfache, zuverlassige und leicht zu implementierende Losung beruht die Methode auf der Kombination aus einer Drehmomenterfassungsmethode und einer kontinuierlichen Vorhersage des Schadigungsniveaus der Zahnrader. Zuerst werden der Stand der Technik und die theoretischen Grundlagen von Schadigungsberechnungen basierend auf dem Nennspannungskonzept und einer linearen Schadensakkumulation dargestellt. Danach wird die globale Struktur des Schadigungsberechnungsalgorithmus gezeigt und die fur die Entwicklung ausgewahlte methodische Vorgehensweise erlautert. Diese bezieht sich grundsatzlich auf ein durch Testfahrten und Messungen verifiziertes Antriebsstrangmodell, welches besonders die Schaltungen und die Dynamik des Getriebes berucksichtigt. Ein Serien-Handschaltgetriebe und ein Serien-Doppelkupplungsgetriebe werden betrachtet. Fur diese zwei Getriebetypen werden eine Anforderungsanalyse zur Konfiguration des Algorithmus sowie eine Anforderungsspezifikation fur die Drehmomenterfassungsmethode durchgefuhrt. Auf Basis dieser Untersuchungen wird dann ein Zustandsbeobachter zur Rekonstruktion des Kupplungs- und Getriebeausgangsdrehmoments entwickelt und validiert. Infolgedessen werden eine Synthese der kompletten Methode und die Endversion des Algorithmus vorgestellt. Abschliesend werden die Wirtschaftlichkeit sowie die okologischen Vorteile in Bezug auf die Einfuhrung der Lebensdauermonitoringmethode im Rahmen von Leichtbaumasnahmen diskutiert und bewertet