Thèses sur le sujet « Signatures électriques »
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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.
Texte intégralNotre 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.
Texte intégralLeng, Sovannarith. « Identifying and evaluating aging signatures in light emitting diode lighting systems ». Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30035/document.
Texte intégralIn 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.
Texte intégralBoumegoura, 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.
Texte intégralElectrical 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.
Texte intégralAlthough 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.
Texte intégralThis 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.
Texte intégralDuloung, 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.
Texte intégralMoreover 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.
Texte intégralElectrical 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
Humbert, Laurent. « Influence du vieillissement des composants constituant une cellule de commutation sur sa signature électromagnétique ». Ecully, Ecole centrale de Lyon, 1999. http://www.theses.fr/1999ECDL0018.
Texte intégralSerie, Eric. « Contribution à l'étude des aérosols des régions arides et semi-arides : granulométrie, mesure des flux, signature électrique ». Toulouse 3, 1995. http://www.theses.fr/1995TOU30159.
Texte intégralRezard, Quentin. « High-throughput identification of circulating cancer cells using biophysical signature ». Thesis, Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILN011.
Texte intégralTumor releases various elements in its local environment. Among those, circulating tumor cells (CTCs) spread from the primary tumor to the blood vessels, colonizing distant organs and inducing metastasis, responsible for 90% of cancer deaths. With the increasing interest in liquid biopsy for diagnosis, CTC detection in the whole blood became a hot topic. However, their heterogeneity and low concentration are challenges demanding single-cell analysis in a high-throughput way. Therefore, there is a need for a reliable and high throughput method for CTC detection, which should be practical for both handling and data management to use routinely in a medical context. The currently approved method, CellSearch, targets surface epithelial biomarkers. However, many cancer cells lose such biomarkers when experiencing epithelial to mesenchymal transition and acquire invasive capabilities leading to a higher metastatic potential. Consequently, clinical applications would benefit from a more reliable biomarker. As CTCs exhibit exotic physical features acquired to survive during their journey in the vascular system, physical biomarkers appear as promising label-free biomarkers for CTC detection. Fundamental techniques for mechanical single-cell characterization, e.g., AFM, demonstrate sensitive but low-throughput measurements, which prevents their use for practical applications. Therefore, high-throughput alternatives capable of analyzing large cell populations have arisen, such as microfluidics. Nevertheless, there exists a trade-off between the throughput and the information content. Faster methods cannot reach optimal information content although they can provide needed throughput. The information content of high-throughput approaches can be improved by combining electrical and mechanical measurements to attain multiparameter analysis. In this context, a reliable, high throughput, and practical method is proposed to characterize cancer cell lines in real-time according to their biophysical signature. A hybrid microfluidic MEMS device was designed and fabricated to perform impedance cytometry with 3D silicon electrode pairs and mechanical characterization by compressing cells between the sidewall converging into the channel and the tip of the mechanical sensor. Sensitive measurements were sustained by keeping all functional MEMS elements in the air and accessing the channel via air-liquid interfaces. Multiparameter analyses were realized performing simultaneous electrical and mechanical measurements. Response of each cell was monitored, first, electrically at three different frequencies and then mechanically during a compression cycle while flowing along the channel. Specially designed and fabricated electrodes provided a trajectory-free electrical characterization, which was resulted in a reliable differentiation of cell sizes and additional information on membrane conductivity and cytoplasm resistivity. Different statistical analyses were made using measured parameters and parameters defined with them. Cell populations could be distinguished successfully based on these parameters. However, classification at the single-cell level was only possible when artificial intelligence and statistical learning algorithms were implemented. Performed blind tests following a learning session resulted in >99% success in predicting the cell type. To sum up, the proposed method demonstrated a practical, optics-free, cost- and labor-efficient way of analyzing multiple biophysical parameters of single cells in a high-throughput format. This practical method provided improved information on single cells without compromising throughput. Integrating more MEMS elements, e.g., additional actuators for mechanical compression and sorting, can lead to a revolutionary single-cell sorter based on biophysical properties. As an alternative for flow cytometry, it can be used for many clinical applications, e.g., cancer diagnosis as proposed in this study
Le, Mounier Audrey. « Méta-optimisation pour la calibration automatique de modèles énergétiques bâtiment pour le pilotage anticipatif ». Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT038/document.
Texte intégralIn order to tackle the actual climate issues, the building field is encouraged to reduce his energetic consumption without changing the occupant’s comfort. In this context, the aim of the ANR PRECCISION project is to develop tools and methods for energetic management of the buildings which needs the use of dynamical thermal models. The PHD works, realise between the G2Elab and the G-SCOP, was focused on models parametric estimation issues. Indeed, uncertainties due to unknown phenomena and the nature of models lead to difficulties for the calibration of the models. Nowadays, this complex procedure is still not automatable: auto-regressive models have a low capacity to extrapolate because of their inadequate structure, whereas the physical models are non-linear regarding many parameters: estimations lead towards local optimums which highly depend on the initial point. In order to eliminate these constraints, several approaches have been explored with physical models adapted for which identifiability studies have been reached on an experimental platform: PREDIS MHI. Different optimisation strategies will be proposed in order to determine the parameters which can be estimated. The first approach uses an analyse a priori of the parametric dispersion, the second one use a meta optimisation which dynamicaly determined as the optimisation sequence, the parameters which can be readjusted. The results are analysed and compared to several approaches (universal models, “simple” identification of all the parameters of a physical model, genetic algorithm …) in different application cases
Tchoumakov, Sergueï. « Signatures relativistes en spectroscopie de matériaux topologiques : en volume et en surface ». Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS258/document.
Texte intégralDuring my PhD studies I focused on the relativistic properties of threedimensional topological materials, namely Weyl semimetals and topological insulators. After introducing surface states and topological materials I discuss their covariance in trigonometric and hyperbolic rotations. These transformations help to solve the equations of motion of an electron in a magnetic field or at the surface with an applied electric field or with a tilt in the band dispersion. In a first place, I illustrate these transformations for the magneto-optical response of tilted Weyl semimetals. This work is related to my collaboration with experimentalists at LNCMI, Grenoble for characterizing the band structure of Cd₃As₂ where we show that this material is a Kane semi-metal instead of a Dirac semi-metal in the experimentally accessible range of chemical doping. The other part of this thesis is concerned with the surface states of topological insulators. I show that massive surface states can also exist in addition to the chiral surface state due to band inversion. Such states may have already been observed in ARPES measurement of oxidized Bi₂Se₃ and Bi₂Te₃ and in transport measurement of strained bulk HgTe. I show the work we performed with experimentalists at LPA, Paris on the behavior of HgTe surface states for strong field effects. Finally, I discuss the states at the interface of a Weyl semimetal and a small gap insulator. In this situation, an applied magnetic field or the tilt of the band dispersion can strongly affect the observed surface states
Bouslama, Mohamed. « Approche duale de modélisation TCAD et de caractérisations électriques approfondies pour la détermination de la signature et de la localisation des pièges dans les HEMT GaN sur substrat SiC ». Thesis, Limoges, 2020. http://www.theses.fr/2020LIMO0076.
Texte intégralGaN-based HEMTs have already demonstrated their supreme potential for all high power and high frequency applications. However, this technology suffers from limitations due to complex trapping/de-trapping mechanisms that occurs in the device and that are still not well understood. This trapping mechanism limits the RF performances but also undermines the device reliability. In this work, we have investigated the trapping mechanisms using different advanced measurements techniques (LF S-parameter measurements, I-DLTS, noise current spectral density) to identify the signature of traps.Thanks to SentaurusTCAD simulation, we have identified and understood the physical location of several traps in the device. This contribution would provide an efficient feedback for future technological improvements
Alameh, Kawthar. « Contribution au diagnostic et a l'analyse de défauts d'une machine synchrone à aimants permanents ». Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR072/document.
Texte intégralThe advent of new magnetic materials and recent advances in power electronics have played a major role in the progress of hybrid electric vehicles. Nowadays, permanent magnet synchronous machines (PMSM) thanks to their performances, especially their energy efficiency, are considered as ideal candidates for the traction chains of hybrid and electric vehicles. However, due to material aging, manufacturing defects or severe operating conditions, different types of faults are capable to occur in the machine components, its control or measuring devices. In order to ensure safety, reliability and availability, the integration of a fault diagnosis and condition monitoring approach in the automotive electrical powertrain system is becoming more and more important. In this context, the aim of the thesis is to contribute to the diagnosis and characterization of faults in the PMSM based on a vibration analysis. First, analytical modeling approaches for the PMSM and inter-turn short-circuits, eccentricity and rotor demagnetization faults will be proposed. The major interest of such models, in a diagnosis context, is to study the behavior of the machine in the presence of studied faults in order to deduce the most suitable detection methods. In addition, numerical models will be developed in order to validate the analytical magnetic and mechanical parts of the machine as well as the demagnetization fault. In the phase of fault impact analysis, we will focus on the cases of rotor eccentricity and demagnetization. The fault indicators will be extracted from the vibratory signal representations in time and space domains and their Fourier transforms, in the cases of single faults and the cases of two combined faults. For single fault cases, two diagnosis approaches will be proposed: the first uses the principle of statistical tests and fault signature tables, inspired by model-based diagnosis methods, while the second relies on a set of three neural networks, such as each one is with a single input and a single output and dedicated to isolate one type of fault. Finally, the performance of these two approaches, in terms of robustness and adaptability, will be compared for the same training and test sets
Denecker, Mélanie. « Le rôle des sulfates de sodium dans l’altération des pierres du patrimoine bâti : méthodes indirectes d'identification pour l'approche expérimentale ». Thesis, Cergy-Pontoise, 2014. http://www.theses.fr/2014CERG0727/document.
Texte intégralSodium sulfates are well known to be the most damaging salts in building materials and rocks. The crystallization processes of sodium sulfates are not completely understood, and more specifically the transition between the heptahydrate (SS7, Na2SO4-7H2O) and the mirabilite (SS10, Na2SO4-10H2O). The metastable heptahydrate has long been neglected in scientific works on salt damage until recently, and its role in rock weathering has not been established so far. In order to better understand the role of the different phases in damaging process, it is important to be able to identify which phase crystallizes under specific environmental conditions. Unfortunately, salt crystallization occurs very often within porous material and crystallization processes cannot be observed directly in situ. In this study, we use temperature monitoring to detect and identify the hydrates crystallization during cooling/heating cycles a sodium sulfate solution and limestone samples saturated with the same solution. In parallel, other experimental approaches consist to measure the electrical and elastic responses of the crystallization/dissolution processes occurring in the porous media. These methods enable to characterize the different phases occurring during temperature cycle and can be used in further experimental studies about ageing test in order to estimate the role of the different sodium sulfate hydrates involved in the salt weathering of rocks
Bouzida, Nabila. « Extraction de la signature veineuse dans le moyen (MWIR) et le proche infrarouge (NIR) - Analyse de la thermorégulation du corps ». Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26541/26541.pdf.
Texte intégralRance, Olivier. « Synthèse de RCS pour la conception de tags RFID sans puce à forte capacité de codage ». Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT050.
Texte intégralThe important growth of RFID goes along with the development of many technologies which complement the current offer by adding new possibilities. The chipless RFID is a perfect example of such technology. The purpose of the approach is to considerably reduce the price of the tag while increasing the data encoding capacity in order to compete with the barcode. The RF link between the tag and the reader also permit a flexible reading. In order to increase the coding capacity of a chipless tag, this PHD work proposes a new coding method based on the overall shape of the electromagnetic signature. To do this, we must be able design tags for which the RCS is given in advance, which amounts to the resolution of an inverse problem. A method based on the decomposition of the RCS on a base of resonators is proposed. The main characteristics of these base elements (amplitude, frequency, quality factor) are controlled by geometric parameters
Blanchard, Torea. « Caractérisation de drones en vue de leur localisation et de leur suivi à partir d’une antenne de microphones ». Thesis, Le Mans, 2019. http://www.theses.fr/2019LEMA1042.
Texte intégralThis thesis work focuses on the acoustic identification of drones in order to design an array with few microphones (up to 10) and adapted to the frequencies emitted for localizing and tracking these devices. Characterization measurements have shown the inherent harmonic structure of the signal emitted by the UAV propulsion systems. A filtering step before the localization, adapted to this type of signal, is proposed. It consists of the detection of the fundamental frequency by the HPS (Harmonic Product Spectrum) algorithm and a series of bandpass filters to preserve the useful harmonics of the signal. Two methods of localization are compared through numerical simulations and experimental measurements. The first is beamforming in the time domain. Usually used for angular source localization, it is extended for localization in 3D space. The second, called acoustic goniometry, estimates the angular position of the target as a solution to an inverse problem. A Kalman filter is then used to track the target. An experimental measurement campaign made it possible to establish a database of the displacement of a small four-engine drone for different trajectories. Data analysis showed that a small number of harmonics (3 to 6) in the signal spectrum of the source to be located is sufficient to estimate the position of a source without significant loss in accuracy relative to a location without processing. The choice of this strategy is justified for localization and tracking in the presence of several drones
Cuevas, Salvatierra Mauricio Andrés. « Méthodes non-invasives de diagnostic de défauts et d'analyse thermique des machines synchrones à pôles saillants ». Thesis, Artois, 2017. http://www.theses.fr/2017ARTO0209/document.
Texte intégralThis work aims to develop non-invasive monitoring techniques on AC rotating machines so that their implementation is easy in an industrial environment. For this purpose, two independent methods are described: a fault diagnosis in alternators connected to the local power gird and an exploratory study to evaluate the internal temperature of AC rotating machines.The first method relies on the analysis of two physical magnitudes: the stray magnetic field radiated outside from the external frame and the vibrations content of machine structure. Mathematical models have been developed in order to correlate magnetic and mechanical phenomena which occur in three different machine states: healthy and in two winding short-circuit faults both in the stator and in the rotor. These results were then validated experimentally in laboratory as well as on large machines in industrial environment. A first diagnostic prototype is presented capable to be implemented in industrial environment in order to detect short-circuit faults in larges alternators.In a second time, a temperature estimation method is proposed based on observations concerning variations in material characteristics of windings as temperature increases. Thus, the localizations of impedance resonant frequencies are impacted, which was verified experimentally as well.This thesis work allowed to verify diagnostic feasibility and on-line monitoring methods in rotating machines in a non-invasive way in industrial environments
Camier, Thomas Romain. « Détection et reconnaissance des actions simples réalisées par le résident pour l'assistance cognitive ». Thèse, Université de Sherbrooke, 2013. http://hdl.handle.net/11143/6541.
Texte intégralGomina, Kamil. « Méthodologie et développement de solutions pour la sécurisation des circuits numériques face aux attaques en tensions ». Thesis, Saint-Etienne, EMSE, 2014. http://www.theses.fr/2014EMSE0751.
Texte intégralGeneral use products as mobile phones or smartcards manipulate confidential data. As such, the circuits composing them are more and more prone to physical attacks, which involve a threat for their security. As a result, SoC designers have to develop efficient countermeasures without increasing overall cost and complexity of the final application. The analysis of existing attacks on digital circuits leads to consider power attacks, in advanced technology nodes.First of all, the power signature of a circuit was determined at design time. To do so, an electrical model was suggested based on the current consumption and the overall power grid capacitance. The methodology to extract these parameters, as well as the evaluation of the model are presented. This model allows designers to anticipate information leakage at design time and to quantify the protection of countermeasures, as the use of integrated decoupling capacitors. Then, the study was dedicated to power glitch attacks. The different fault injection mechanisms were analyzed in details. From then on, a set of detection circuits were suggested and evaluated at design time and on silicon by electrical tests. Both the theoretical analysis and the given methodology were confirmed by the test campaigns.This work demonstrated that the design of low-cost solutions against passive and active power attacks can be achieved, and used in a large scale product development
Khlaief, Amor. « Contribution à la commande vectorielle sans capteur mécanique des machines synchrones à aimants permanents (MSAP) ». Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00814276.
Texte intégralLe, Coat Gwenaëlle. « DISCRETION ELECTROMAGNETIQUE DES MACHINES ELECTRIQUES TOURNANTES ». Phd thesis, 1997. http://tel.archives-ouvertes.fr/tel-00906722.
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