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Статті в журналах з теми "Signatures électriques"
Bélanger, N., W. H. Hendershot, M. Bouchard, and S. Jolicoeur. "Identification des compartiments responsables de la qualité des eaux de surface d'un petit bassin versant du centre du Nouveau-Brunswick (Canada): application et analyse du modèle hydrochimique EMMA." Revue des sciences de l'eau 11, no. 1 (April 12, 2005): 117–37. http://dx.doi.org/10.7202/705300ar.
Повний текст джерелаДисертації з теми "Signatures électriques"
Sixdenier, Fabien. "Prédiction de signatures électriques dans un actionneur en prenant en compte les lois de matériaux." Phd thesis, Université Claude Bernard - Lyon I, 2005. http://tel.archives-ouvertes.fr/tel-00011188.
Повний текст джерелаNotre travail a consisté à développer des outils de simulation dans lesquels le circuit magnétique est au coeur de la conversion énergétique. Des hypothèses simplificatrices ou/et des couplages de méthodes à priori ou en temps réel nous autorisent à étudier les régimes transitoires à l'intérieur de ces circuits et à en évaluer les pertes.
Le couplage de méthodes de représentation ainsi que les hypothèses y attenant est décrit au fil des chapitres. Les résultats obtenus permettent l'analyse minutieuse du rôle du circuit magnétique pour plusieurs systèmes à vocation industrielle ainsi que la réflexion sur d'éventuelles améliorations à apporter à ces systèmes.
Sixdenier, Fabien. "Prédictions de signatures électriques dans un actionneur en prenant en compte les lois de matériaux." Lyon 1, 2005. http://tel.archives-ouvertes.fr/docs/00/05/16/56/PDF/Prediction_de_signatures_electriques.pdf.
Повний текст джерелаLeng, Sovannarith. "Identifying and evaluating aging signatures in light emitting diode lighting systems." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30035/document.
Повний текст джерелаIn this work, the degradation of light emitting diodes (LEDs) is studied by identifying and evaluating their aging signature during the stress time. The custom-made experimental test bench is built for realization of the test measurement. Through this experimental test bench, it allows to test a large amount of LED samples and enable to select different temperature condition and different current stress level. There are four different types of LED with similar characteristic in term of their color temperature, IF, VF, power (1W) and as monochip, but different technology coming from Cree, Osram, Philips and Seoul Semiconductor. The devices are firstly characterized their electrical and photometrical characteristic at their initial state, then they are submitted to different current stress condition at low current stress (350mA) and high current stress (1000mA) while the thermal stress is fixed at one temperature (50°C). The study of these devices failure mechanism is archived by using the primary method based on the electrical and photometrical characterization of the devices that allows to evaluate their degradation at different locations of the device components such as semiconductor chip, interconnection and device's package. The electrical characteristic of the device's I-V curve: at low injected current level and reverse bias allow us to identify the degradation characteristic of device's semiconductor chip, at high injected current level allows us to determine the degradation of device's ohmic contact and photometric characteristic allows us to evaluate the degradation of device's package system
Monsterleet, Aymeric. "Etude des architectures optiques pour la génération de formes d'ondes électriques arbitraires pour applications radar." Paris 11, 2005. http://www.theses.fr/2005PA112283.
Повний текст джерелаBoumegoura, Tarek. "Recherche de signature électromagnétique des défauts dans une machine synchrone et synthèse d'observateurs en vue du diagnostic." Ecully, Ecole centrale de Lyon, 2001. http://www.theses.fr/2001ECDL0008.
Повний текст джерелаElectrical traction use more and more the asynchronous machines because of their robustness, their power weight ratio. Their maintenance as well as their diagnosis then became an economic state. It is important to early detect the faults likely to appear in those motors and therefor to implement a preventive maintenance. Thus, a detailed model of the machine was developed in order to analyse the impact of those faults on the machine performance. We could then get specific signatures for electrical faults and foresee their evolution. Our approach is based on keeping a close watch over parameters of the performance model of the machine perticularly sensitive to faults : the rotor resistances of three phase model, the magetising inductance and the rotoric resistance of a two phase model. Some tools for detecting motor faults, based on extended Kalman and High Gain observes adapted to non-linear systems, were workout to record these parameters. They were successfully tested on data from a motor bench as well as on data from finite element model
Frini, Marouane. "Diagnostic des engrenages à base des indicateurs géométriques des signaux électriques triphasés." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSES052.
Повний текст джерелаAlthough they are widely used, classical vibration measurements have several limitations. Vibration analysis can only identify about 60% of the defects that may occur in mechanical systems. However, the main drawbacks of vibration measurements are the difficult access to the transmission system in order to place the sensor as well as the consequent cost of implementation. This results in sensitivity problems relative to the position of the installation and the difficulty to distinguish the source of vibration because of the diversity of mechanical excitations that exist in the industrial environment.Hence, the Motor Current Signatures Analysis (M.C.S.A.) represents a promising alternative to the vibration analysis and has therefore been the subject of increasing attention in recent years. Indeed, the analysis of electrical signatures has the advantage of being a technically accessible method as well as inexpensive and non-intrusive to the system. Techniques based on currents and voltages only require the motor’s electrical measurements which are often already supervised for the purposes of the control and the protection of the electrical machines. This process was mainly used for the detection of motors faults such as rotor bars breakage and eccentricity faults as well as bearings defects. On the other hand, very little research has been focused on gear faults detection using the current analysis. In addition, three-phase electrical signals are characterized by specific geometric representations related to their waveforms and they can serve as different indicators providing additional information. Among these geometric indicators, the Park and Concordia transforms model the electrical components in a two-dimensional coordinate system and any deviation from the original representation indicates the apparition of a malfunction. Moreover, the differential equations of Frenet-Serret represent the trajectory of the signal in a three-dimensional euclidean space and thus indicate any changes in the state of the system. Although they have been previously used for bearing defects, these indicators have not been applied in the detection of gear defects using the analysis of electrical current signatures. Hence, the innovative idea of combining these indicators with signal processing techniques, as well as classification techniques for gears diagnosis using the three-phase motor’s electrical current signatures analysis is established.Hence, in this work, a new approach is proposed for gear faults diagnosis using the motor currents analysis, based on a set of geometric indicators (Park and Concordia transforms as well as the properties of the Frenet-Serret frame). These indicators are part of a specifically built fault signatures library and which also includes the classical indicators used for a wide range of faults. Thus, a proposed estimation algorithm combines experimental measurements of electrical signals with advanced signal processing methods (Empirical Mode Decomposition, ...). Next, it selects the most relevant indicators within the library based on feature selection algorithms (Sequential Backward Selection and Principal Component Analysis). Finally, this selection is combined with non-supervised classification (K-means) for the distinction between the healthy state and faulty states. It was finally validated with a an additional experimental configuration in different cases with gear faults, bearing faults and combined faults with various load levels
Hosni, Houssem. "Conception d’un jumeau numérique pour un procédé d’aspiration industrielle." Electronic Thesis or Diss., La Rochelle, 2022. http://www.theses.fr/2022LAROS031.
Повний текст джерелаThis thesis is devoted to the design of a digital twin for industrial ventilation systems in a monitoring and diagnostic context. The input measurements of the model are exclusively electrical and no mechanical sensors are used. The particular cases of fixed and variable speed are studied. At constant speed, the demodulation of electrical currents is particularly studied and an original algorithm, based on an orthogonal signal generator, is proposed, compared to the main known methods, and validated experimentally. At variable speed, the proposed approach is based on order tracking methods without mechanical sensor in which the analysis signals are sampled as a function of the mechanical angle. In this case, the spectral components become independent of the rotation speed and the frequency analysis can be exploited. An original method is presented. It is based on the definition of an observer from a reduced number of information on the considered motor. The estimated speed is used to deduce the mechanical position and to perform the angular resampling. A generalization of the concept of ordertracking is also presented, allowing to define resampling angles adapted to the monitored faults. This method is tested on a LIAS test bench and on the industrial ventilation process
Mathews, Nripan. "Signatures de l'injection optique et électrique de charges dans des monocristaux de rubrene." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00351281.
Повний текст джерелаDuloung, Corinne. "Modélisation comportementale des perturbations électromagnétiques en électronique de puissance : signature CEM d'une cellule de commutation." Aix-Marseille 3, 2001. http://www.theses.fr/2001AIX30091.
Повний текст джерелаMoreover increasing switching frequencies of converters induces increases of high frequencies part of parasitic spectrum. As a consequence, that power electronic equipment's EMC performances are very difficult to analyse. Because it is very important to be able to separate influences of switch ON and switch OFF phases on generated frequency spectrum, we have developped a tool : ASPECT (Source's Analyse of Perturbations in Electronic CommuTation), to analyse in time and in frequency, the voltage and the current waveforms of a a very simple converter : the switching cell. The work realized in this thesis treats the problem of CEM in static converter by identifying the source of perturbation : we have analyzed temporal form of commutation. ASPECT is interactive in time and in frequency, and it authorizes the different commutation study's : theoretical, experimental, simulate. We will apply our tool for helping the engineer in his choice of a cell taking electromagnetic disturbances and losses into account
Bourguet, Salvy. "Contribution à l'étude de l'influence du réseau de distribution d'un navire tout électrique sur sa signature électromagnétique." Nantes, 2004. http://www.theses.fr/2004NANT2104.
Повний текст джерелаElectrical installations aboard passenger and goods vessels keep developing with a more and more frequent use of electric propulsion and the massive introduction of power converters. As far as military ships are concerned the increase of the aboard electrical power must not compromise its 'discretion', especially due to an uncontrolled electromagnetic signature. In enhancing the circulation of currents as well as the presence of voltage in a low frequency range within the distribution network, this study mainly focuses on propulsion systems and aims at finding the sources of such perturbations. A commutation functions based analysis allows to reveal low frequency perturbations in the different parts of the propulsion system. Two kinds of converters are dealt with: current source inverters and voltage source inverters. Both of these drives generate network and propulsion motor driving frequency dependent interharmonic perturbations. These ones are foreseeable according to the kind of converter and to propulsion structure (coupling of the transformers, propulsion motors stator windings). Some measures recorded aboard several all electric ships equipped with this kind of propulsion converters validate this approach. Numeric simulation is used and developed in order to have a tool to predict the perturbations within the propulsion systems and the distribution networks of the electrical ships. Subsequently, in an experimental approach, this work puts forward a description of the different leakage currents coming from several installations. The measure of the electromagnetic signature transmitted by an all electric cruise hip is presented and analysed, showing the influence of the frequencies of the electrical sources onboard
Тези доповідей конференцій з теми "Signatures électriques"
HADJI, Y., B. LEHOUIDJ, Y. SAHRA, A. NACER, and H. MOULAI. "Etude comparative des signatures électriques liées à la propagation de streamers dans les liquides diélectriques." In 2018 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM). IEEE, 2018. http://dx.doi.org/10.1109/cistem.2018.8613570.
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