Dissertationen zum Thema „Performance en puissance“
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Guo, Shuibao. „High performance digital controller for high-frequency low-power integrated DC/DC SMPS“. Lyon, INSA, 2009. http://theses.insa-lyon.fr/publication/2009ISAL0033/these.pdf.
Der volle Inhalt der QuelleDespite being a popular research topic, digital control is still seldom applied in practical low-power high-frequency integrated SMPS converters. Phones, PDAs and music/video players are still mainly designed with analog PWM control inside the voltage regulator blocks. This is mainly due to the apparent complexity of implementation, cost constraint and absence of digital controller architectures that can support operation at switching frequencies significantly higher than 1MHz with low-power consumption features. Broader acceptance of digital techniques in low-power high-frequency SMPS is still hampered by practical problems of the combination of cost issues, trade-off performances and power consumption. However, with the rapid development of Very Large-Scale Integration (VLSI) technologies and CMOS manufacturing technique, and associated with their design tools in the last decade, it is now very possible to realize the high performance digital control in power electronics system by high-speed low-power digital devices (FPGA, ASIC, etc). With these advantages, the implementation of digital controller has become more feasible for low-power high-frequency SMPS design in portable electronics applications. The research interest of the thesis is to explore practical ways of incorporating advantages of digital control in practical implementation, investigates issues of digital controller implementation at lower power levels, gives detailed guidelines for digital controller design and hardware selection, and proposes new hardware solutions for the main functional digital controller blocks. Two main objectives of this work focus the implementation of high-resolution high-frequency digital PWM (DPWM) and high-performance digital control algorithms for SMPS in FPGA-based realization
Neurouth, Adrien. „Etude de la performance énergetique d’une transmission de puissance haute vitesse“. Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI017/document.
Der volle Inhalt der QuelleA way to improve both electric and hybrid vehicles is to use high speed motors, operating over than 42.000rpm. The goal is to increase the power density and the efficiency of powertrains. Using these new motors, new gearboxes should be developed. This must be done without generating significant additional cost regarding already mastered low speed solutions. High energy performance level also has to be maintained. This PhD comes before the design phase of a high-speed oil bath lubricated gearbox. It aims to identify the warm-up and power loss problems, and propose ways to improve efficiency. This work proposes a thermomechanical modelling of the gearbox’s first stage, using the thermal network method. This model links power losses with temperatures. Particular attention is paid to high speed bearing modelling. A new thermomechanical model of rolling element bearing is developed. As churning losses being significant at high speeds, a method to greatly reduce this power loss is characterized
Paquette, Myriam. „Caractérisation de l'oxygénation musculaire lors d'efforts en canoë-kayak et relation avec la performance“. Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/69444.
Der volle Inhalt der QuellePerformance in sprint canoe-kayak has been associated with maximal O2 uptake (VO2max), lactate threshold, as well as anaerobic fitness and muscle qualities. However, the physiological peculiarities of sprint canoe-kayak suggest that the peripheral component of the aerobic system, and more precisely the muscle O2 extraction capacity, is an important determinant of performance. A good understanding of the key performance indicators is crucial to validate training programs and tests used to monitor training adaptations in athletes. With the advent of portable and affordable near infrared spectroscopy devices, it is now possible to measure changes in muscle oxygenation (SmO2) in different active muscles during exercise. Thus, the goals of the four articles included in this thesis were to characterize the changes in muscle oxygenation during exercise and in response to different types of training in order to better understand the role of peripheral adaptations in sprint canoe-kayak performance and explore the effect of different types of training on these physiological parameters and on performance. Study 1, examining the association between muscle oxygenation parameters and 200m, 500m and 1000m performance in provincial to international level canoe-kayak athletes, concludes that maximal O2 extraction in the muscles studied is the best predictor of performance over all three distances, and suggests that O2 extraction is a better predictor of performance than VO2max in sprint canoe-kayak. In Study 2, the evaluation of the acute physiological response to various interval training sessions indicated that sprint interval training (SIT), compared to short interval training (HIIT), induces the lowest SmO2 levels and cumulates the longest time at low SmO2, potentially making it a stimulus of choice to generate muscle O2 extraction adaptations, and therefore improve performance in sprint canoe-kayak. Study 3 assessed changes in muscle oxygenation in response to a 3-week training camp in a group of elite athletes, to assess whether the training usually prescribed to kayakers elicits peripheral adaptations. After the training camp, the improvement in performance over 200m and 1000m was concomitant with reduced SmO2, suggesting an improvement in O2 extraction capacity. Finally, in the last study of this thesis, the effect of a SIT or HIIT program on muscle oxygenation parameters and on performance over 200m, 500m and 1000m was measured, in order to assess whether sessions generating low and sustained levels of SmO2 present an optimal stimulus for improving O2 extraction capacity. HIIT improved performance in all three time trials, while performance improvements were trivial after SIT. VO2max was unchanged after training, but the maximum deoxygenation achieved in the 1000m time trial was increased in response to both training types. In the 1000m, the increase in performance with training was associated with the increase in maximal deoxygenation in the latissimus dorsi and vastus lateralis muscles, especially in the HIIT group. While these results do not support the hypothesis that SIT would be a better stimulus than HIIT to induce peripheral adaptations, they do highlight the important contribution of peripheral adaptations to sprint kayaking performance. Thus, the results presented in this thesis allow for a better understanding of the physiological demand of sprint canoe-kayak and attest to the role of peripheral adaptations, and more specifically of the muscle O2 extraction capacity, as a physiological determinant of performance. They confirm that training is associated with increased O2 extraction capacity, and that the latter is associated with increased performance. Given these results, it becomes clear that the training of sprint canoe-kayak athletes should aim at optimizing peripheral adaptations. Measuring changes in muscle oxygenation during exercise during tests, training sessions and time trials can provide valuable information on the athlete's profile, help identify the physiological components to be optimized and assess the athlete's response to the training program, and would be a valuable tool to add to the monitoring performed with canoe-kayak athletes.
Rambaud, Olivier. „Facteurs musculaires associés à la performance en lancer : exploration par l'analyse des relations Force-Vitesse et Puissance-Vitesse“. Lyon 1, 2008. http://www.theses.fr/2008LYO10085.
Der volle Inhalt der QuelleThe aim of this work was i) to validate a method to calculate force during bench press exercise according to data obtained with a kinematic device; ii) to relate the muscle characteristics of the upper and lower limbs of throwers (discus, hammer and shot-put) to the performance; and iii) to propose a protocol adapted to throwers’ evaluation. Firstly, forces calculated according to data obtained with a kinematic device during bench press exercise were compared to those simultaneously measured with a force platform. The results showed the importance of taking the upper limbs mass into account when forces are calculated using a kinematic device. Secondly, muscular characteristics of the upper (maximal power, force and velocity determined from bench press exercise) and lower limbs (maximal power, force and velocity determined from half squat exercise and musculotendinous stiffness) were analyzed in a group of high level male throwers. Whatever the throwing events considered, results demonstrated that throwing performance was associated on the one hand with high lower limb strength and a high level of leg stiffness, and on the other hand with a upper limbs maximal power. Finally, force, velocity and power determined during cycling and those obtained from half squat exercise were compared. From a quantitative point of view, power, force and velocity values determined during cycling were significantly different. However, the same relationships between muscular characteristics and throwing performance were evidenced. In line with previous analysis the following testing protocol could be suggested: half-squat 1-RM (one repetition maximal) and musculotendinous stiffness determination for lower limbs, and maximal power estimation from one bench press against a barbell without load for upper limbs
Attiogbe, Amévi Elvis. „Facteurs d'influence de la relation détente verticale - puissance maximale musculaire des membres inférieurs“. Thesis, Paris 10, 2019. http://www.theses.fr/2019PA100170.
Der volle Inhalt der QuelleThe present thesis fits on the border of muscle physiology and biomechanics. Three studies investigated the factors influencing the relationship between vertical jump (DV) and maximal power out on cycle ergometer (Pmax). Study A, conducted on 106 participants from two groups (volleyball players, VB, and physical education students (PES) without specific training in jumping or cycling exercises) including 67 Caucasian (C) 39 West African (WA) origins, showed significant effects of sports practice (VB>PES) and enthnicity (E) (WA>C) on countermovement jump with arm swing (CMJA). However, the difference in Pmax was not significant between groups. The CMJA-Pmax relationships were different in C and WA (P=0.003). Therefore, CMJA predicted from Pmax would be underestimated in WA. The same difference was observed for CMJA-PmaxArms relationship. Study B, conducted on 84 participants, showed E significant difference (WA>C) in DV on a force platform in squat jump (SJ), countermovement jump (CMJ), CMJA, CMJA-CMJ, CMJA/CMJ. The effect sizes of E were large for CMJA, CMJA-CMJ, CMJA/CMJ and medium for CMJ and SJ. E effect of countermovement jump (CMJ-SJ) was not significant. In study C, the effects of anthropometric factors [body height (BH), sitting height (SH), foot length (FL), leg length (LL), Body Weight (BW), BMI, Body fat (BF), BF/BW and Skelic (Sk=LL/SH) or Cormic (Co=SH/BH) indices], and E (C vs WA) on SJ, CMJ and CMJA)] have been measured on a force platform in 55 PES [32 Caucasians (group C) and 23 West-Africans (group WA)]. Only SH, Sk and Co were significantly different in C and WA. All DV performances were higher WA The ethnic difference in SH could partly explain the higher DV values in WA
Paquette, Myriam. „Effet comparé de l'entaînement par intervalles inframaximal et supramaximal sur les déterminants de la performance à vélo“. Master's thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25474.
Der volle Inhalt der QuelleHigh-intensity interval training (IT) is superior to continuous training for improving endurance performance. Inframaximal IT (performed at intensities below maximal aerobic power [MAP]) is widely used by endurance athletes, but supramaximal IT (performed at intensities above MAP) is also associated with improved endurance performance. By now, it is unkown which type of IT leads to the best performance outcomes. The purpose of this study was to assess the effects of supramaximal and inframaximal IT on key endurance performance determinants. After six weeks of training, despite a 47 % lower training volume, supramaximal IT led to an increase in maximal oxygen consumption (VO2max) similar to inframaximal IT. MAP was increased following inframaximal IT only, and only supramaximal IT increased anaerobic capacity.
Mendes, Andréa Cristina. „Choréopolitique d'un devenir hybride : l'art de la performance comme puissance critique dans la traduction du déséquilibre“. Thesis, Paris 1, 2015. http://www.theses.fr/2015PA010562.
Der volle Inhalt der QuelleThe following thesis is a research about the art of performance in its aesthetic, political,ethical, cognitive and subjective implications; within the Brazilian anthropophagy tradition’s artistic and cultural context in the period when the art of performance emerges as an artistic genre, in the sixties and seventies. Faced with such implications, the art of performance not only indicates a process of hybridization of artistic genres and the relations between artist, work and spectator; but also indicates a whole different way of existence: « becoming-hybrid ». Defining « hybrid » as an intruder paradigm who overcomes the age of signification, one that assumes a hegemonic and uncritical trend in the world established by Western modernity; we ask ourselves about the critical contributions and challenges of becoming-hybrid in the art of performance and in the culture, especially considering the mechanisms that blocks the new ways of feeling and of production of subjectivity.To develop this discourse, we lean foremost on the concept of: the esthetic ideas of Deleuze-Guattari; the psychodynamic approach to subjectivity and the sensitive ways to deal with the otherness of thought of Suely Rolnik; the reformulation of the anthropophagic tradition according to the Anthropophagous manifesto by Oswald de Andrade; the theory of perspectivism; and the Amerindian myth by the anthropologist Viveiros de Castro. In this sense, in order to increase the critical power of the body and other ways of existence concerning the hybridization of the world, we propose the thinking of performing art as a hybrid paradigm of some another modernity. The way of creation, the resistance and the knowledge of the performer show a critical attitude and a heterogenetic dynamic, an alter-action of himself and of the world itself, which is very similar to the old anthropological matrix of anthropophagy. The performer, then, affirms the possibility of the emergence of another modernity, possibly linked to another kind of hybrid world, an animistic and completely anti monotheist world, which understands life as devouring, as immanence of the danger and imminence of the meaning. A world where social solidarity is defined by otherness and where the indian cogito would be « it exists, therefore it thinks »
Debraux, Pierre. „Etude des déterminants de la performance en cyclisme: puissance musculaire et aérodynamisme. Application en BMX“. Reims, 2010. http://theses.univ-reims.fr/sciences/2010REIMS013.pdf.
Der volle Inhalt der QuelleThe BMX competitions take place on a specific track of 300-400 m with bumps and turns, and with a downhill start. The displacement velocity reached by the riders may be greater than 70 kmh-1 a few seconds after the start. Few scientific studies focused to the parameters related to the performance in BMX. Nevertheless, a study showed that the starting phase was capital and that the maximum muscle power was a major contributor to performance during this phase. The aim of this thesis is to study the determinants of performance in this sport in focusing on two main parameters: the muscular power output of the lower limbs and a variable of aerodynamics, the projected frontal area. Firstly, the study of the muscular power output in lower body during sprints on a cycle ergometer and a ½ Squat among road cyclists and BMX riders showed that the muscle cross-sectional area and maximal muscle strength were indicators of performance for all-out sprints (~ 6-30s). A comparison of muscular inertial profiles has shown that BMX riders produced a maximal power output with relative light loads and it was necessary to increase muscular power output at heavy loads. Secondly, a new field method for measuring the projetcted frontal area in cycling has been tested. This method is reproducible and valid in comparison to the methods of weighing photographs and digitization. This method was used to measure the projected frontal area of BMX riders during 80 m sprints. These sprints allowed to highlight the importance of the maximal power, the projected frontal area and the average pedaling rate on the chronometric performance and the need to find an optimal gear to decrease the difference between the average pedaling rate and the optimal pedaling rate. To optimize the performance in competition among the BMX riders, it seems necessary: i) to follow a resistance training to increase muscle mass and muscle maximal strength of the lower limbs; ii) to adjust the gear ratio depending on the riders; and iii) to optimize the projected frontal area for some phases of the race. Solutions are proposed in this thesis
Plourde, Kevin. „Relation entre les seuils lactiques, la puissance de pédalage et la performance de cyclistes expérimentés“. Thèse, Université du Québec à Trois-Rivières, 1997. http://depot-e.uqtr.ca/4929/1/000634787.pdf.
Der volle Inhalt der QuelleDoré, Eric. „Evolution de la puissance maximale anaérobie dans une population non-sélectionnée de filles et garçons ages de 7 a 21 ans“. Clermont-Ferrand 2, 1999. http://www.theses.fr/1999CLF20033.
Der volle Inhalt der QuelleFARENC, DIDIER. „Modelisation, conception et optimisation de composant de puissance lateral dmos integre. Etude des limites de performance en energie“. Toulouse 3, 1997. http://www.theses.fr/1997TOU30273.
Der volle Inhalt der QuelleFlach-Malaspina, Nicolas. „Conception globale d'une pompe à chaleur air / eau à puissance variable pour le secteur résidentiel“. Phd thesis, Paris, ENMP, 2004. http://www.theses.fr/2004ENMP1227.
Der volle Inhalt der QuelleBouthillier, Sébastien. „Relations entre la maturité, la morphologie, la puissance anaérobie et la performance de jeunes nageurs et de jeunes nageuses“. Sherbrooke : Université de Sherbrooke, 1997.
Den vollen Inhalt der Quelle findenPinot, Julien. „Etude de la puissance mécanique comme variable d'amélioration de la performance en cyclisme à travers l'interface homme-machine“. Thesis, Besançon, 2014. http://www.theses.fr/2014BESA1007/document.
Der volle Inhalt der QuelleThis thesis has been completed as part of a CIFRE agreement between the laboratory C3S(EA4660) and the Research and Development (R&D) department of the FDJ professionalcycling team. The various studies that we conducted centred on analysing sport performanceoptimisation in cyclists through a central variable: the mechanical power output (PO)developed during locomotion. There were two main areas of focus: 1) evaluation andmonitoring of physical potential, with the aim of improving the training process, and 2)optimisation of the human–machine interface via analysis of the materials and equipmentused by the FDJ team cyclists
Dubois, Florentine. „Une méthodologie de conception de modèles analytiques de surface et de puissance de réseaux sur puce hautement paramétriques basée sur une méthode d’apprentissage automatique“. Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENM026/document.
Der volle Inhalt der QuelleIn the last decade, Networks-on-chip (NoCs) have emerged as an efficient and flexible interconnect solution to handle the increasing number of processing elements included in Systems-on-chip (SoCs). NoCs are able to handle high-bandwidth and scalability needs under tight performance constraints. However, they are usually characterized by a large number of architectural and implementation parameters, resulting in a vast design space. In these conditions, finding a suitable NoC architecture for specific platform needs is a challenging issue. Moreover, most of main design decisions (e.g. topology, routing scheme, quality of service) are usually made at architectural-level during the first steps of the design flow, but measuring the effects of these decisions on the final implementation at such high level of abstraction is complex. Static analysis (i.e. non-simulation-based methods) has emerged to fulfill this need of reliable performance and cost estimation methods available early in the design flow. As the level of abstraction of static analysis is high, it is unrealistic to expect an accurate estimation of the performance or cost of the chip. Fidelity (i.e. characterization of the main tendencies of a metric) is thus the main objective rather than accuracy. This thesis proposes a modeling methodology to design static cost analysis of NoC components. The proposed method is mainly oriented towards generality. In particular, no assumption is made neither on the number of parameters of the components nor on the dependences of the modeled metric on these parameters. We are then able to address components with millions of configurations possibilities (order of 1e+30 configuration possibilities) and to estimate cost of complex NoCs composed of a large number of these components at architectural-level. It is difficult to model that kind of components with experimental analytical models due to the huge number of configuration possibilities. We thus propose a fully-automated modeling flow which can be applied directly to any architecture and technology. The output of the flow is a NoC component cost predictor able to estimate a metric of interest for any configuration of the design space in few seconds. The flow builds fine-grained analytical models on the basis of gate-level results and a machine-learning method. It is then able to design models with a better fidelity than purely-mathematical methods while preserving their main qualities (i.e. low complexity, early availability). Moreover, it is also able to take into account the effects of the technology on the performance. We propose to use an interpolation method based on Kriging theory. By using Kriging methodology, the number of implementation flow runs required in the modeling process is minimized and the main characteristics of the metrics in space are modeled both globally and locally. The method is applied to model logic area of key NoC components. The inclusion of traffic is then addressed and a NoC router leakage and average dynamic power model is designed on this basis
Chelly, Mohamed Souhaiel. „Mesure de la puissance maximale des membres inférieurs chez l'homme : ses relations avec l'élasticité, le vieillissement et la performance“. Saint-Etienne, 2000. http://www.theses.fr/2000STET001T.
Der volle Inhalt der QuelleFargeas, Marie-Agnès. „Mesure de la puissance mécanique externe chez l'enfant lors d'un exercice de courte durée sur ergocycle et tapis roulant (étude longitudinale)“. Clermont-Ferrand 2, 1993. http://www.theses.fr/1993CLF22513.
Der volle Inhalt der QuelleBouthillier, Sébastien. „Relations entre la maturité, la morphologie, la puissance anaérobie et la performance de jeunes nageurs et de jeunes nageuses“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0034/MQ26552.pdf.
Der volle Inhalt der QuelleThongam, Jogendra Singh. „Commande de haute performance sans capteur d'une machine asynchrone = High performance sensorless induction motor drive“. Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2006. http://theses.uqac.ca.
Der volle Inhalt der QuelleAkiki, Tilda. „Modélisation de la dégradation de la production de puissance d'une pile à combustible suite aux sollicitations mécaniques“. Phd thesis, Université de Technologie de Belfort-Montbeliard, 2011. http://tel.archives-ouvertes.fr/tel-00607268.
Der volle Inhalt der QuelleAziz, Usama. „Détection des défauts des éoliennes basée sur la courbe de puissance : Comparaison critique des performances et proposition d'une approche multi-turbines“. Thesis, Université Grenoble Alpes, 2020. https://tel.archives-ouvertes.fr/tel-03066125.
Der volle Inhalt der QuelleSince wind turbines are electricity generators, the electrical power produced by a machine is a relevant variable for monitoring and detecting possible faults. In the framework of this thesis, an in-depth literature review was first performed on fault detection methods for wind turbines using the electrical power produced. It showed that, although many methods have been proposed in the literature, it is very difficult to compare their performance in an objective way due to the lack of reference data, allowing to implement and evaluate all these methods on the basis of the same data.To address this problem, as a first step, a new realistic simulation approach has been proposed in this thesis. It allows to create simulated data streams, coupling the power output, wind speed and temperature, in normal conditions and in fault situations, in an infinite way. The defects that can be simulated are those that impact the shape of the power curve. The simulated data are generated from real data recorded on several French wind farms, located on different geographical sites. In a second step, a method for evaluating the performance of fault detection methods using the power produced has been proposed.This new simulation method was implemented on 4 different fault situations affecting the power curve, using data from 5 geographically remote wind farms. A total of 1875 years of 10-minute SCADA data was generated and used to compare the detection performance of 3 fault detection methods proposed in the literature. This allowed a rigorous comparison of their performance.In the second part of this research, the proposed simulation method was extended to a multi-turbine configuration. Indeed, several multi-turbine strategies have been published in the literature, with the objective of reducing the impact of environmental conditions on the performance of fault detection methods using temperature as a variable. In order to evaluate the performance gain that a multi-turbine strategy could bring, a hybrid mono-multi-turbine implementation of fault detection methods based on the power curve was first proposed. Then, the simulation framework proposed to evaluate mono-turbine methods was extended to multi-turbine approaches and a numerical experimental analysis of the performance of this hybrid mono-multi-turbine implementation was performed
Bouillod, Anthony. „Positions sur le vélo et performance en cyclisme“. Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD032/document.
Der volle Inhalt der QuelleThe studies conducted during this PhD research showed that optimizing the position of the cyclist on the bicycle is a key factor influencing cycling performance. Our research focused on four main axes: the design and validation of measurement tools, the study of the aerodynamic position, the study of the seated position and the study of the standing position.All the results showed that the performance capacity of cyclists can be improved in aerodynamic position by increasing the ratio between the mechanical power (PO) and the drag area (ACd). Comfort is also a significant factor in time trial (TT) performance as it determines the ability of the cyclist to maintain position over time. Our works show that comfort can be improved via orthopaedic correction in cyclists affected by lower limb length inequality (LLLI) in the TT position, related to a reduction in pelvis movements. The orthopaedic correction also induces an increase in gross efficiency (+5.7%). Thus, this improvement in comfort could increase the PO and/or the amount of time the aerodynamic position can be maintained during a TT. Therefore, cyclists affected by LLLI should compensate LLLI with individualised foot orthotics to improve their TT performance. In a preliminary study, we also showed that there is a relationship between head movements and ACd. Therefore, cyclists should minimise these movements to minimise their ACd and maximise their performance. Aerodynamic position must be evaluated in real cycling locomotion, whether for the evaluation of A or ACd. We have developed two applications that are a real asset for the dynamic evaluation of aerodynamic drag (Ra) as they make the data analysis more accessible to coaches. Finally, although we have initiated a new method to assess ACd in the aerodynamic position by combining 3D scanning and computational fluid dynamics simulation, this method is also recommended for individualisation of cycling equipment.The seated cycling position can also be optimised by increasing the cyclists’ force effectiveness (FE), regardless of practice level or gender. This increase in FE is mainly due to a decrease in resistive force (Fres) during the upstroke phase of pedalling. Nevertheless, the cyclist should not pull on the pedal to generate propulsive torque because this strategy is counterproductive from an energy point of view. It would be interesting to extend our first study, which was set up in a laboratory, to the field to analyse the biomechanical adaptations of cyclists to the real conditions of locomotion. The differences observed in the laboratory, on level ground and over an uphill grade suggest that cyclists adjust their pedalling technique according to the conditions under which they are performing.Finally, studies of the standing cycling position show that cyclists increase their mechanical cost (MC) (+4.3% in the laboratory vs. +19% in the field) compared to the seated position; however, oxygen consumption was similar between the two positions. These mechanical losses (13 W in the laboratory vs. 49 W in the field) in the standing position are mainly due to increased rolling resistance coefficient (Crr), induced by the lateral sways of the bicycle and therefore torsion of the tyres. Because the observed mechanical losses are higher in the field than on the treadmill, other factors could contribute to this difference, such as Ra (~10 W), the equipment used by cyclists, the Crr of the road surface and the technique adopted. Also, the standing position induces an increase in MC to maintain constant speed when faced with uphill slope variations. Cyclists are therefore strongly recommended to reduce the increase of the MC in standing position compared to the seated position. This reduction in mechanical losses can be achieved by decreasing lateral sways and Ra
Vu, Ngoc Tuan. „Dynamique régénérative du véhicule : Transfert de puissance optimal par la maîtrise des comportements du véhicule de distribution“. Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0104/document.
Der volle Inhalt der QuelleIn this work, we have studied the energy optimal transfer by controlling the delivery vehicle behaviors. We studied, in particular, the energy consumed by a hybrid vehicle in the urban area. This context led us to investigate the use of a regenerative dynamics by taking into account the vehicle lateral dynamics on a variety of architectures associated with a method for controlling an over-actuated system. To do this, we have developed: (i) a modular virtual test bench to study the energy terms of delivery hybrid vehicle, (ii) an optimal control to determine the actuator inputs of over-actuated system, (iii) and regenerative dynamics to manage energy by taking into account the vehicle lateral dynamics. The virtual test bench constructed in this work allow for studies of the energy consumed for all architectures without changing of each module. This bench is composed the models of vehicle dynamics, steering, traction, braking, and electrical components systems. All models of this bench have been validated by experiments. It provides us the ability to validate and justify the control inputs of actuators and to evaluate the energy consumed terms. The optimal control module by using the allocation controller was also built in this work. It allows us to determine the optimal inputs of the actuators and to simulate the behaviors of all vehicle architectures under the constraints related with different architectures. The results show that the allocation controller is sufficient to determine the actuator inputs and to ensure the vehicle stability without the integration of additional criteria in the optimization problem. The energy gains in comparison with conventional architecture, which have been determined, ensure that the proposed approach effectively reduce the energy consumed by the vehicle. The parametric studies show that the regenerative dynamics can be used to recover energy in the case where the actuators have a very good performance and fast dynamics. In this case, the principle of regenerative dynamics is being improved for delivery vehicles (heavy load and in urban areas)
Quiban, Romain. „Modélisation des pertes de puissance d’engrenages spiro-coniques lubrifiés par bain d’huile : Application à une boîte de transmission arrière d’hélicoptère“. Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI066.
Der volle Inhalt der QuelleThe current environmental context is driving the aeronautic industry towards new design criteria. On the one hand, governments demand emission reductions of pollutants and on the other hand, customers, i.e. aircraft manufacturers, are pushing to reduce fuel consumption. Both of these goals can be achieved through efficiency improvements. As such, it is important to understand and quantify losses generated in power transmission systems. The objective of this study is to model the power losses of an helicopter tail gearbox. These gearboxes are generally characterized by the presence a spiral bevel gear and oil bath lubrication. A test campaign on an elementary test bench was carried out to measure the resistive torque of spiral-bevel wheels rotating in an oil bath. An uncommon evolution of the torque with the rotational speed was observed. From these results, a simple analytical model has been developed for the calculation of power losses. This model was then validated on a tail helicopter gearbox application, for which resistive torque and temperature measurements were made
Amar, Djamel. „Performance assessment and modeling of flexible optical networks“. Thesis, Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0007/document.
Der volle Inhalt der QuelleWith the exponential growth of traffic driven by video and Internet services, WDM systems evolve regularly to increase optical fiber capacity. To meet the relentless need for capacity, advanced features have been integrated into optical layer leading to the notion of channel flexibility (datarate elasticity, flex-grid). In contrast, with the potential benefits that optical channel flexibility provides, network dimensioning gets even more complicated, and traditional dimensioning tools should be rethought. Moreover, some strategic and technological problems appear with optical layer flexibility. Almost, all legacy equipment in the optical layer needs to be replaced by greenfield and well-adapted equipment, which requires new investments. Furthermore, spectrum fragmentation has been identified as the main disadvantage of optical layer flexibility. This work proposes and implements different mathematical multilayer tools for network dimensioning with the aim of evaluating optical layer flexibility. It identifies profitable and advantageous use cases and networking scenarios that bring forward the interest of flex-grid and elasticity. This work also deals with the potential troubles of flexibility and provides solutions to them. Specifically, we thoroughly investigate spectrum fragmentation in operator network context, and propose some traffic engineering strategies. We propose and evaluate a new use case that combines datarate elasticity and optical restoration within a multilayer context. Finally, we state a new drawback of flex-grid technology regarding the use of legacy optical amplifiers with flex-grid networks and provide a solution to overcome this problem
Lu, Wei. „Relations force-vitesse lors du mouvement pluri-articulaire : impact de la fatigue“. Thesis, Le Mans, 2020. http://www.theses.fr/2020LEMA1005.
Der volle Inhalt der QuelleMuscular explosivity is associated with the notion of power (i.e., product of force and velocity) and represents the skill to produce as much work as possible in a short time period. During multi-articular movement, such as squat, bench press and pedalling, the force-velocity relationship has been described by a negative linear relationship. However, during more complex movements that involve the whole-body, the linearity of the force-velocity relationship has not yet been established yet. Moreover, the impact of fatigue on the force-velocity relationship remains uninvestigated. This work intended i) to investigate the force-velocity relationship during a movement that involved all body segments, the deadlift high pull; and ii) to explore the impact of fatigue on this relationship.In the experimental part of our work, we first determined the shape of the force-velocity relationship during the deadlift and high pull movement and evaluated the reproducibility of the performance and the force-velocity associated with this movement. Then, we compared the difference and correlation between the two commonly methods used to assess force-veloctiy relationships: the force platform and the accelerometer. At last, the impact of fatigue on the force-velocity performance and the force-velocity relationship was analyzed
Xiao, Song. „Research on insulation performance of SF6 substitute CF31/CO2 under power frequency voltage and the influence of micro-moisture on CF31“. Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30184/document.
Der volle Inhalt der QuelleA large amount of gas insulated equipment are applied widely as the key part of power system. Gas insulated equipment develop quickly and used widely in high and ultra-high voltage field owing to its high stability, less maintenance work, smaller floor space, and flexible configuration. Nowadays, SF6 is adopted as the main insulation medium of gas insulated equipment, which is considered a kind of dangerous greenhouse gas to environment. Global climate warming caused by greenhouse effect brings disastrous consequences to our living conditions. Electric devices account much for the emission of SF6, which makes it urgent to find a kind of environment-friendly substitute insulating gas. Besides, the decomposed products of SF6 under discharge may be corrosive to internal material and poisonous to power workers. In the early period of global research and development of environment-friendly insulated devices, mastering the formula and key technique of substitute gas is vital to electrical development. According to the above circumstance, systematic investigation of the insulating characteristics of CF3I/CO2 mixed gases under power-frequency voltage was carried out firstly, which could provide useful information for the best mixed ratio of CF3I/CO2 and the design of internal structure in matching devices. Then insulating characteristic of CF3I/CO2 and CF3I were tested under a kind of normal insulating defect of free metal particles defect, and the influence of metal particles on the thermodynamic characteristics and transmission properties of CF3I discharge plasma were calculated theoretically. The overall performance of CF3I/CO2 under typical defects were tested for the choice of internal metal materials of electrical devices. Finally, the influence of moisture, the main hazardous material on gas insulated equipment, on the insulating performance of CF3I were conducted experimentally and theoretically, which proved the harmful effect of moisture on the new insulating medium and provided theoretical foundation for the standard constitution of moisture content
Dorel, Sylvain. „La production de puissance maximale au cours du mouvement de pédalage : implications bioénergétique et application à l'étude de la performance de haut niveau en sprint en cyclisme sur piste“. Saint-Etienne, 2004. http://www.theses.fr/2004STET010T.
Der volle Inhalt der QuelleGenevois, Cyril. „Effets de l'entrainement sur la performance en coup droit et l'hypersollicitation du membre supérieur en tennis“. Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10327/document.
Der volle Inhalt der QuelleThis work aimed at exploring the training modalities to develop maximal post impact ball velocity fo the tennis forehand drive, while assessing the potential risk of upper limb oeruse. The results of our studies showed that maximal power developed during a two-handed side medecine-ball(MB) throw explained 25% of the variation of maximal forehand ball velocitiy, and was achieved when using a MB mass of 5,7 % of player's body weight. However, the relationship between throwing distances and maximal ball velocity of forehand drive was weak. By contrast, a significant relationship was found between the performance for the one-handed side MB throw and the maximal velocity of the forehand drive. A six-week trainig program based on one-hand MB throws increased the ball velocity by 11%, but the shot accuracy tended to be reduced. In the same way, a six-week training program including forehand drives with an overweighted racketr about 12 % allowed the maximal forehand ball velocity to be improved (5%), without alteration in theshot accuracy. Finally, the comparison of muscular coordination between both MB throws and the forehand drive demonstrated that the trunk and upper limb muscles presented similar activity pattern and levels. The potentials for injury risk would thus not justify. In conclusion, the finding of this work contributed to the periodization of the strength and conditioning training in order to improve the forehand drive performance in nonprofessional competitive tennis players
Carlos, Da Silva Daniel. „Development of a closed-form modeling methodology for the subsystems of electric vehicles : optimization of energy performance“. Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST014.
Der volle Inhalt der QuelleTo maximize the contribution of hybrid electric vehicles (HEV) to the decarbonization of the transportation sector, it is essential to maximize their energy performance during the design phase. However, the additional power pathways to propel the vehicle act both as an advantage and an added layer of complexity. Indeed, evaluating the consumption of an HEV requires defining a supervisory control, known as Energy Management Strategy (EMS). Therefore, optimizing the design entails combining a static optimization problem (system's plant) with a time-dependent problem (its control), both of which must be considered in tandem.This plant/control co-optimization is typically tackled through either nesting optimal control algorithms within each iteration of a general optimization algorithm for the plant, or employing convex optimization to simultaneously optimize both layers. However, the former approach is known to be limited by computational constraints, while the latter may impact modeling fidelity due to convexity constraints.As a different perspective, this thesis introduces a methodology for developing explicit models to estimate powertrain energy consumption, referred to in this work as the Explicit Powertrain Consumption Model (EPCM). They are developed using component models to account for power losses, then by introducing a second modeling level to consider the impact of sizing variations on loss estimation. Such a formulation can be used as a computationally efficient objective function of an optimization problem that remains static, while enabling human-explainable analysis for reduced problems.The thesis presents the methodology development while using a Fuel Cell Hybrid Electric Vehicle (FCHEV) as a reference vehicle. Besides modeling components commonly found in electric vehicles, it includes a model for the fuel cell system, while further considering models for the power electronics, often overlooked in vehicle design studies. It first introduces the considered component models, then the models for the sizing variation (i.e., the predictive models), before developing the EPCMs and using them for the co-optimization.The validation of the component models using a Toyota Mirai~II on a roller test bench presents an overall error of less than five percent, while the study to assess the impact of the predictive models on the hydrogen consumption resulted in errors below two percent when compared to reference models. Then, an assessment of the usage of EPCMs explores the assumptions required to ensure an explicit formulation; and the co-optimization of the Mirai~II powertrain shows that an EPCM using an affine EMS can be a fair approximation for the co-optimization at the vehicle's first design stages, while reducing the evaluation time by a factor of 100. This study is further extended with reduced problems to observe the impact of the EM sizing only, then of the hybridization level, resulting in linear and quadratic expressions for the fuel consumption and the optimization constraints, which can be used to quickly derive analyses of the vehicle's energy performance.Although the results show that the current state of the methodology can be used for the co-optimization of FCHEVs, the thesis further explores its improvement points and suggests alternative applications to solidify its validity and relevance
Deribew, Dargie Hailu. „Structure, morphology and performance relationships of organic photovoltaic devices : the block copolymer approach“. Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-01055312.
Der volle Inhalt der QuelleBulusu, Sri Satish Krishna Chaitanya. „Performance Analysis and PAPR Reduction Techniques for Filter-Bank based Multi-Carrier Systems with Non-Linear Power Amplifiers“. Thesis, Paris, CNAM, 2016. http://www.theses.fr/2016CNAM1042/document.
Der volle Inhalt der QuelleThis thesis is part of the European FP7 EMPHATIC project (Enhanced Multicarrier Techniques for Professional Ad-Hoc and Cell-Based Communications) including various European universities and two main industrial partners: THALES Communications Security and CASSIDIAN. The EMPHATIC objective is to develop, evaluate and demonstrate the capability of enhanced multi-carrier techniques to make better use of the existing radio frequency bands in providing broadband data services in coexistence with narrowband legacy services. The project addresses the Professional Mobile Radio (PMR) application. The main idea is to analyze the viability of broadband systems based on filter-bank multi-carrier (FBMC) clubbed with o ffset quadrature amplitude modulation (OQAM) in the context of the future 5th Generation (5G) radio access technology (RAT). Increasingly, the FBMC-OQAM systems are gaining appeal in the probe for advanced multi-carrier modulation (MCM) waveforms for future communication systems. This advanced modulation scheme o ers numerous advantages such as excellent frequency localization in its power spectral density (PSD), a robustness to phase noise, frequency off sets and also to the multi-user asynchronism; making it more appealing than OFDM for PMR, cognitive radio (CR) and 5G RAT. However, like any other MCM technique, FBMC-OQAM suff ers from high PAPR. When the power amplifi er (PA) non-linearity, which is realistic radio-frequency impairment, is taken into account; the good frequency localization property is severely compromised, due to the spectral regrowth. The first objective of this PhD thesis is, to predict the extent of the spectral regrowth in FBMC-OQAM systems, due to the PA non-linearity. The second objective is to probe techniques for FBMC-OQAM systems, such as PAPR reduction and PA linearization, in order to mitigate the NL eff ects of PA. By cumulant analysis, spectral regrowth prediction has been done for FBMC-OQAM systems. Also, some algorithms for PAPR reduction, which are based on probabilistic approach and adding signal methods, have been proposed. The coexistence capability of the FBMC-OQAM based broadband system with the narrowband PMR systems in the presence of PA has been analyzed and it has been found that coexistence is possible, provided there is a symbiotic combination of PA Input Back-off (IBO), PAPR reduction and PA linearization. Finally, a novel PA linearization technique has been proposed for FBMC-OQAM
Yammine, Samer. „Contribution to the Synchronous Reluctance Machine Performance Improvement by Design Optimization and Current Harmonics Injection“. Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14555/1/yammine.pdf.
Der volle Inhalt der QuelleChikhaoui, Walf. „Etude des mécanismes physiques responsables des dysfonctionnements des transistors HEMTs à base d'hétérostructures AlGaN/GaN et AlInN/GaN“. Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00679527.
Der volle Inhalt der QuelleSamozino, Pierre. „Capacités mécaniques des membres inférieurs et mouvements explosifs. Approches théoriques intégratives appliquées au saut vertical“. Phd thesis, Université Jean Monnet - Saint-Etienne, 2009. http://tel.archives-ouvertes.fr/tel-00483683.
Der volle Inhalt der QuelleClemençon, Michel. „Fonction musculaire et performances fonctionnelles de la personne âgée“. Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10312/document.
Der volle Inhalt der QuelleThis work has focused on the study of factors that explain the functionals performances of the lower limbs of the elderly. In a first study we showed that the maximum power (Pmax) and its component called the optimal speed (Vopt) obtained during a test of force-velocity of the knee extensors, are important determinants of functional performance elderly evaluated on three tests: walking on 6m, sit to stand 5 times from a chair and climbing 5 stairs. The more a person has a high Pmax and Vopt, the more its performance during functional tests will be. In addition, Vopt is considered an indirect assessment of the percentage of fast fibers; subjects with the highest values of Vopt are best performers during functional tests. The second study measured and compared the electromyographic (EMG) activity of the quadriceps when tested for isometric maximum voluntary contraction (IMVC), determination of maximum power and functional tests mentioned above. Measurement of EMG signal during these tests was used to determine to what extent the type of task induced a maximum activation or not. Older people show a greater ability to activate their quadriceps muscles when tested for concentric contraction rather than isometric or eccentric contractions. Tests using the IMVC compared to tests for determining the power, sit-tostand and stairs climbing would not be the most appropriate tests to measure the maximum neuromuscular activation capacity in the elderly. From these results improved testing of the elderly and guidelines for rehabilitation are proposed
Genov, Antonio. „Estimation de la consommation basée sur les modèles de performance SystemC-TLM des systèmes d'interconnexion et de mémoire des SoC“. Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4108.
Der volle Inhalt der QuelleThe rapid pace of development in microelectronics enables the semiconductor industry to constantly surpass itself and to offer ever more innovative and complex products and technologies. The most modern areas of development, such as 5G, the Internet of Things (IoT) and automotive, rely on complex, high¬-performance, low-¬power designs. Unfortunately, this increased complexity often leads to higher power consumption and more challenging designs. In order to solve these problems and differentiate themselves in the market, System¬-on-Chip (SoC) manufacturers and engineers are putting tremendous effort into researching new development strategies. Numerous studies have shown that one of the key steps to take is to revisit the early stages of the design flow and, in particular, to integrate simulation-based modeling and verification at a higher level of abstraction. The early stages of product development are critical to avoiding costs, delays, and other unexpected problems. As a result, Hardware/Software (HW/SW) architectural exploration has become a key component of SoC modeling. In this thesis, we address this gap and present a framework for mixed performance and power estimation/management of SoCs using high¬-level SystemC/TLM2.0 functional models. Our methodology allows us to dynamically extract performance and power, while considering functional model activity, power management and reduction strategies, and memory system consumption. In this way, we can observe the impact of power management on performance and optimize the trade¬off between the two at the very beginning of the design flow. We address this shortcoming and present our first dynamic approach for mixed power/performance estimation applied to an NXP Intellectual Property (IP) interconnection subsystem used in i.MX8 SoC series. This modeling methodology uses the PwClkARCH library, which follows UPF semantics and enables power estimation and management. Its key point is that it maintains a strong separation between the functional code and the power intent description. There is no intrusive power¬-oriented code in the functional model, which simplifies architectural exploration, allows joint and separate reuse of behavioral and power models, and leads to more complete code and easier performance estimation
Li, Yiqun. „Contribution à l'optimisation des performances d'antennes de téléphones mobiles à l'aide de techniques d'adaptation“. Cergy-Pontoise, 2009. http://biblioweb.u-cergy.fr/theses/09CERG0429.pdf.
Der volle Inhalt der QuelleMobile telephone antenna design can be summarised as a complex “multi-objectives” problem. Hence, in the actual procedure of the mobile phone antenna design, “trial and error” method is widely used thanks to simulation software or measurement tools. Free-space bandwidth is considered as the central decision criterion. A new design approach allowing simultaneous optimization of the antenna performances in free-space and in the presence of a user is applied in this thesis. The central decision criterion is changed to the ratio of TRP / SAR. Bandwidth is compensated in other way, in particular, the matching technique. For this aim, the matching limits between the reflexion coefficient and the bandwidth with a matching network for a mono- and dual-band mobile phone antenna are deduced. The limits allow us a larger degree of freedom in the design of mobile phone antenna. This thesis leads to a practical method for obtaining a good compromise between the various constrains, by adding a matching network, with consideration on the influence of the complete radio transmission chain including the power amplifier
Morancho, Frédéric. „Le transistor MOS de puissance à tranchées : modélisation et limites de performances“. Phd thesis, Université Paul Sabatier - Toulouse III, 1996. http://tel.archives-ouvertes.fr/tel-00165581.
Der volle Inhalt der QuelleBen, Ammar Faouzi. „Variateur de vitesse de hautes performances pour machine asynchrone de grande puissance“. Toulouse, INPT, 1993. http://www.theses.fr/1993INPT142H.
Der volle Inhalt der QuelleKarray, Mohamed Kadhem. „Evaluation analytique des performanes des réseaux sans-fil par un processus de Markov spatial prenant en compte leur géométrie, leur dynamique et leurs algorithmes de contrôle“. Phd thesis, Télécom ParisTech, 2007. http://pastel.archives-ouvertes.fr/pastel-00003009.
Der volle Inhalt der QuelleJacob, Pierre. „Groupes de secours statiques à hautes performances : application des principes de la résonance“. Toulouse, INPT, 1986. http://www.theses.fr/1986INPT050H.
Der volle Inhalt der QuelleRoudet, James. „Analyse et comparaison des divers modes de conversion statique CC-CC : modes de commutation et sûreté de fonctionnement, performances CEM“. Grenoble INPG, 1990. http://www.theses.fr/1990INPG0139.
Der volle Inhalt der QuelleFinianos, Boutros. „The effects of a 1-year recreational football protocol on bone mineral density and physical performance parameters in a group of healthy inactive 50 years old men“. Thesis, Littoral, 2021. http://www.theses.fr/2021DUNK0575.
Der volle Inhalt der QuelleThe aim of this PhD thesis were to explore the relationships between several physical performance variables and bone parameters in a group of middle-aged men, to compare composite indices of femoral neck strength in inactive middle-aged men and ages-matched former football players and to explore the effects of a 1-year recreational football protocol on bone mineral density and physical performance parameters in a group of healthy inactive 50-year-old men. Three main studies have been conducted. The first study has shown that VO₂ max (L/min), lean mass and maximum power of the lower limbs are the strongest determinants of bone variables in middle-aged men. The second study has shown that former footbal practice is associated with higher composite indices of femoral neck strength in middle-aged men. The third study has demonstrated that WB BMC, FN BMD, CSMI, CSI, BSI and ISI increased in both experimental groups (RF30 and RF60) but not in the control group. The percentages of variations in bone health parameters and in physical performance variables were not significantly different in both experimental groups. Recreational football is an effective method to improve bone health in middle-aged men
Dekhissi, Habri. „Etude des performances des technologies HCMOS 3 et HCMOS 4“. Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37604368s.
Der volle Inhalt der QuelleErnst, Thomas. „Etude des structures MOSFET avancées sur SOI pour les applications basse consommation“. Grenoble INPG, 2000. http://www.theses.fr/2000INPG0118.
Der volle Inhalt der QuelleLoraine, Jérôme. „Amélioration des performances intrinsèques d'un amplificateur de puissance grâce à une méthode de linéarisation“. Thesis, Cergy-Pontoise, 2019. http://www.theses.fr/2019CERG2024.
Der volle Inhalt der QuelleThe increasing demande of wireless connectivity drives the development of the new genration standards using the leading edge technologies in terms of telecommunication. To meet announced data rates, the use of more and more complex signal is necessary to have the most efficient use of the finite radio spectrum. This involve more stringent constraints on the radio emitter to ensure information integrity and a good quality of service. In this context, this thesis aims to the energetic and spectral performance improvement of a CMOS Power Amplifier (PA) for handheld application through a linearization scheme. The PA designed in this thesis is based on the MASMOS (patented cell) and must meet our specifications.The flip-chip interconnection study shows that its impact must be mitigated. For that, we select the differential topology pour the PA design. A differential reference structure (withtout linearization scheme) are designed and measured. It consists in a power stage terminated by a balun integrated on a laminate substrate synthesizing optimal impedance at the fundamental and second harmonic frequencies. The obtained results are close to the state of the art for the CMOS PA for 3G without any linearization scheme.Then, we propose two circuit linearization scheme specific to differential structures. We have selected the use of a differential second harmonic filter within the amplifying cell. The full PA (driver stage + power stage) is then designed. We propose a design method for the output balun as well as the inter-stage matching network. The final simulation results allow us to conclude that the proposed PA exceed the specifications
Reynes, Jean-Michel. „Relations entre performances et parametres structuraux des transistors bipolaires de puissance : application a la conception des composants“. Toulouse, INSA, 1986. http://www.theses.fr/1986ISAT0028.
Der volle Inhalt der QuelleQuentin, Nicolas. „Alimentation à découpage hautes performances pour l'aéronautique“. Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1327/document.
Der volle Inhalt der QuelleThe power supply system in an onboard aeronautical application represents an important contribution to the recurring cost, global efficiency and the volume of the system. Moreover, power supplies are installed in a harsh environment with a wide input voltage range and a confined area. In these conditions, power supply losses impact the converter volume and weight to prevent the system from overheating. Therefore, a gain in efficiency is the main purposes, since it has a significant impact on the reduction of weight and volume of the equipment.Soft-switching is a reasonable technique to increase the switching frequency and limit the power losses. The selection of the topology should take into account 3 considerations: a low number of components, an efficient control, which allows to cover the wide input voltage range and a soft-switching validity over a large input voltage range. Regarding all the considerations, the Flyback active-Clamp topology seems to be the best candidate which has a step-up and down transfer function and ZVS at the primary with only ones additional capacitor and transistor.A technological work is also done to further increase the power supply efficiency. The technologies which have been selected are the GaN transistors for its good switching performances and a planar transformer for its integration into the PCB. Also, the vertical integration of the converter which is actually on two stackable boards, one for the low frequency functions and the other one for the high frequency functions, minimizes the footprint of the converter. The new technologies will make a huge technological leap, especially in the systems where the power supply represents a significant proportion of the equipment. The success of GaN transistor highlights that the power electronics is currently driving by the performance and reducing the parasitic elements is becoming the priority. Looking forward into the future, the interest in 3D packaging and PCB integration will grow rapidly to provide a fully embedded power supply
Souakri, Sonia. „Optimisation des performances d'un procédé industriel d'électrofiltration alimenté par hautes puissances pulsées“. Thesis, Pau, 2016. http://www.theses.fr/2016PAUU3028/document.
Der volle Inhalt der QuelleThe fight against air pollution is a major issue in the twenty-first century. The center of Marcouleof CEA develops different waste treatment processes by incineration / vitrification that generatecombustion gases requiring treatment. To do this, the CEA uses the electrostatic precipitation, atechnical waste gas treatment employed for thin particles filtration.This thesis is dedicated to optimizing the performance of an electrofilter supplied by high pulsedpowered. One of the goals is to size and achieve a new emissive electrode adapted to thedevelopment of a new incineration process. This new electrode coupled to its High Voltage (HV)power supply, which electrical parameters were optimized, allowed to obtain maximum filtrationefficiency during operating times in line with industrial applications. The impact of thephysicochemical characteristics of dusts on the filtration efficiency was analyzed.A specific study also focused on the evolution of different discharge conditions that develop inthe electrofilter to identify the phenomena responsible for the process efficiency fall. The intake ofthe emissive electrode and a hybrid generator, combining a continuous background voltagesuperimposed with impulses, has clearly been demonstrated by their effects on back coronainitiation and therefore on the optimal efficiency operation duration