Siga este enlace para ver otros tipos de publicaciones sobre el tema: Phare intelligent.
Tesis sobre el tema "Phare intelligent"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 50 mejores tesis para su investigación sobre el tema "Phare intelligent".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
1
De, Charette Raoul. "Algorithmes de vision pour la pluie et les feux tricolores pour les systèmes d'aide à la conduite". Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00802707.
Texto completoResumen
L'utilisation d'algorithmes de vision permettrait d'élargir le domaine d'application des systèmes d'aide à la conduite à d'autres situations telles que : les scènes urbaines ou les conditions météorologiques dégradées. À cette fin, trois nouvelles applications sont étudiées dans cette thèse pour la pluie et les feux tricolores. La pluie est la condition météorologique dégradée la plus fréquente. Nous comparons les modèles physiques et photométriques existants pour la pluie et les gouttes de pluie. Lors d'une conduite en temps de pluie de jour, les gouttes sur le pare-brise diminuent considérablement la visibilité du conducteur. Lorsqu'elles sont vue par une camera embarquée standard celles-ci apparaissent défocalisées. Ainsi, nous proposons de détecter ces gouttes hors-focus en utilisant soit une approche par manque de gradients soit par l'évaluation locale du flou. Lors d'une conduite de nuit sous la pluie, ce sont les phares qui paradoxalement diminuent la visibilité car leur lumière est réfléchie par les gouttes vers le conducteur. Nous appuyant sur la conception d'un simulateur physique, nous proposons un éclairage adaptatif qui illuminerait la scène sans éclairer les gouttes qui tombent. Les résultats de notre simulateur et le premier prototype construit montre que l'idée avancée pourrait efficacement améliorer la visibilité générale d'une scène. D'autre part, nous étudions la détection et le suivi de gouttes de pluie à grande vitesse. Les feux tricolores ont un rôle crucial dans la compréhension des scènes urbaines. Bien qu'il existe déjà des systèmes de détection de feux tricolores, les algorithmes actuels ne fonctionnent que dans des conditions simples. Ainsi, nous avons développé un algorithme de détection de feux tricolores qui utilise une détection en niveau de gris des spots lumineux et une classification par reconnaissance de modèle. L'approche ainsi conçue est assez flexible pour détecter différents types de feux tricolores même avec une camera à faible dynamique. Notre proposition a été évaluée sur des séquences acquises en France, Chine et Suisse.
2
Webster, Paul Michael. "Magnetic sensing and intelligent modeling of steel phase transformations". Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.411975.
Texto completo
3
Lafaye, Christophe. "La phase de traque d'information sur internet dans un processus de veille stratégique : une approche longitudinale centrée sur les agents intelligents". Lyon 3, 2004. http://www.theses.fr/2004LYO33030.
Texto completoResumen
Internet modifie le paradigme informationnel des organisations. Aussi, dans un processus de veille stratégique, l'Internet est appréhendé comme un nouveau terrain de traque à part entière. Néanmoins, l'exercice d'acquisition d'information d'anticipation externe (la traque) sur Internet se caractérise par une complexité et une pénibilité importante. C'est pourquoi, des outils d'aide, les " agents intelligents ", ont été développés et proposés pour améliorer significativement l'efficacité et l'efficience de la traque d'information sur Internet. Ce travail doctoral s'intéresse aux dynamiques générales d'assimilation de ces outils dans les organisations. Plus précisément, nous avons formulé la question de recherche suivante : "Comment se structure, dans le temps, l'activité de traque d'information centrée sur l'utilisation des agents intelligents dans un processus de veille stratégique ?"Internet changes the paradigm of organizational information. Internet is, indeed, a new field of strategic informations to the environmental scanning process. Nevertheless, the activity of information acquisition is a complex and hard one on Internet. That's why, intelligent agents had been created to help gatekeepers. Our research deals with general dynamics of assimilation of this tool in an organizational context
4
Belaroussi, Mohamed. "Intelligent real-time microcontroller of pulsewidth modulation controlled three-phase induction motors". Thesis, Robert Gordon University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303619.
Texto completo
5
Nygren, Patrik. "Bioorganisk fastfas syntes för att skapa intelligenta ytor". Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2272.
Texto completoResumen
This thesis investigates three different surface modifications, and the route to design and synthesize them. The thesis is therefore divided into three sub- projects. (i.) Design and synthesis of a peptide which secondary structure could be controlled by a negatively charged surface. (ii.) Design and synthesis of a cyclic peptide, that would self-organize prior to surface interaction, using the type I anti-freeze protein of a winter flounder as template. (iii.) The use of solid-phase synthesis to make the synthesis of SAM-molecules easier.
6
Melester, M. T. y M. S. Geoghegan. "An Intelligent Digital Phase-Locked Loop with Integral Gain Control, Signal Quality and Lock Detection". International Foundation for Telemetering, 1988. http://hdl.handle.net/10150/615089.
Texto completoResumen
International Telemetering Conference Proceedings / October 17-20, 1988 / Riviera Hotel, Las Vegas, NevadaAn intelligent digital phase-locked loop with integral automatic gain control, signal quality and lock detection suitable for implementation using current digital signal processing devices is presented. By exploiting information derived from these functions operating in unison, it is possible to realize improved performance in an adverse environment where fading or abrupt signal outages are encountered. The system described consists of several functions operating under the direction of a stored program. The state diagram model of the program is discussed along with design considerations for the system elements. Various aspects of the system are simulated in the presence of noise and signal outage and compared to the performance of a conventional phase-locked loop.
7
Zhao, Yuting. "Answer set programming : SAT based solver and phase transition /". View abstract or full-text, 2003. http://library.ust.hk/cgi/db/thesis.pl?COMP%202003%20ZHAOY.
Texto completo
8
Buddemeyer, Jenna Leigh. "Variable speed limit decision support system for the Elk Mountain corridor phase 1". Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=2065749141&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.
Texto completo
9
du, Plessis Laura. "Using emotional intelligence to support learners with Autism Spectrum Disorder in the Foundation Phase". Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/60939.
Texto completoResumen
The purpose of this study was to identify characteristics pertaining to emotional intelligence (EI) that parents and Foundation Phase teachers may use when supporting learners with autism spectrum disorder (ASD) in an inclusive classroom setting. Teachers are facing various degrees of challenges due to the demands of a range of diverse needs attributable to the influx of learners with disabilities in the school system. Given the increase in the number of children diagnosed with ASD, research indicates that it is likely that teachers will encounter learners with ASD in their classes. Teachers are generally not trained to identify and cope with such a disability, as many requirements of these learners are beyond the services of a general school system. A multiple case study was conducted where the perspectives of a teacher and two parents were gained, in order to understand experiences with children with ASD from the participants' point of view. The primary aim of this study was therefore to provide both parents and teachers with listed characteristics of EI that they could utilise while supporting learners with ASD in households or the educational sphere.
Findings illuminated the collective characteristics of learners with ASD, which include intense obsessions with a narrow range of subjects, repetitive routines, central coherence difficulties and problems with social-emotional functioning, communication and executive functioning. These indicators require specific responses from parents and teachers to effectively provide support to these learners. Qualities identified that relate to EI are patience, empathy, problem solving skills, working collaboratively with parents and being proactive. The main recommendation relates to specific training in EI skills, to prepare student teachers in supporting the growing number of learners with ASD in their classes.Dissertation (MEd)--University of Pretoria, 2017.
Early Childhood Education
MEd
Unrestricted
10
Ouali, Mohammed El Habib. "Méthodes d'intégration des estimations multi-échelles de la disparité à partir de la phase du filtre de Gabor : algorithmes et évaluations". ENSMP, 2000. http://www.theses.fr/2000ENMP0977.
Texto completoResumen
Nous proposons une nouvelle méthodologie d’intégration multi-échelles des estimations de la disparité à partir des différences de phase. La carte de disparité obtenue à partir des différences de phase d'un seul filtre n'est pas dense. De plus, la disparité n'est pas fiable partout à cause de la présence des effets indésirables des singularités de la phase dans la réponse du filtre. Il est alors naturel d'utiliser d'autres échelles pour éviter ces singularités afin d’améliorer la densité et la précision des cartes de disparités. Pour remédier à ces problèmes, les algorithmes proposés dans la littérature utilisent des palliatifs : la disparité comme une moyenne pondérée des estimations multi-échelles, une stratégie coarse-to-fine ou bien un calcul itératif du type itérations de Newton pour affiner la solution. Comme ces palliatifs présentent des inconvénients, nous proposons d'utiliser des mécanismes explicites pour la sélection multi-échelles. Cette approche est en accord total avec les travaux récents de Koenderink et de Lindeberg. Dans notre cas, nous utilisons les modules de la réponse du filtre ainsi que la distance relative entre la fréquence instantanée observée et la fréquence centrale du filtre comme paramètres de fusion des disparités multi-échelles. Cependant, ceci suppose que nous disposons d'une estimation à toutes les échelles considérées. Pour satisfaire cette condition, nous proposons d'utiliser les dérivées du signal original. Nous observons que les singularités ne se trouvent pas aux mêmes positions selon que nous utilisons le signal ou sa dérivée d'ordre N. Nous proposons également un modèle quadratique pour la détermination des voisinages de singularités sans détecter les singularités. Finalement, nous présentons l’évaluation non-contextuelle et contextuelle des algorithmes, ou nous montrons son importance, d'une part pour guider la recherche et d'autre part dans le transfert des algorithmes vers l'industrieWe propose a new methodology of multiscale phase difference-based disparity integration. Usually, the disparity map obtained with unique filter exhibits a poor density. Moreover, the disparity s not reliable everywhere because of the presence of the unwanted phase singualarities effects. Its is then natural to use other filter tunings, e. G. Scales, to avoid these singularities in order to improve the density and the precision of the disparity maps. To overcome these problems, the algorithms proposed in the literature use palliatives : the disparity is computed as a weighted average of the multiscale estimates, a coarse-to-fine strategy or, finally, an iterative calculation. , like for example Newton iterations, to refine the solution. As these palliatives present drawabacks, we propose to use explicit mechanisms for the multiscale selection. This approach is in total agreement with recent works of Koenderink and Lindeberg. In our case, we use the magnitudes of the filter response as well as the relative distance between the instantaneous frequency observed and the filter peak frequency as fusion parameters of the multiscale estimates. However, this suppose that we have an estimate with all the scales considered. To satisfy this condition, we propose to use the derivative of the original signal. We observe that the singularities are not with the same positions according to wheter we use the signal or its derivative of order N. We also propose a quadratic model to determine the singularities neighborhoods without detecting these singularities. Finally, we present the non-contextual and contextual algorithms evaluation where we show its importance, on the one hand to guide search and on the other hand in the transfer of the algorithms towards industry
11
Jaeger, Laure. "Optimisation multidisciplinaire sous incertitude en phase conceptuelle avion". Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2289/.
Texto completoResumen
Ces travaux de recherche concernent l'optimisation multidisciplinaire déployée lors de la conception de systèmes complexes. Ils sont tout particulièrement centrés sur la conception avion. À ce stade de la conception les incertitudes engendrées sont significatives. De nouvelles méthodes efficaces de modélisation et de propagation des incertitudes sont donc proposées afin de concevoir un système fiable et robuste. Elles font appel à des techniques de modélisation adaptatives, à des algorithmes d'optimisation classiques et à des techniques basées sur l'intelligence artificielle (systèmes multi-agent)These researches concern multidisciplinary optimization deployed in the design of complex systems. They are particularly focused on aircraft design. At this stage of the design, the uncertainties are significant. Effective new methods of modeling and uncertainty propagation are proposed to develop a reliable and robust system. They use techniques of adaptive modeling, optimization algorithms and classical techniques based on artificial intelligence (multi-agent systems)
12
Kralj, S. (Sara). "Cognitive-emotional interplay:implications for children’s development of self-aware emotion regulation as the last developmental phase of emotional intelligence". Bachelor's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201606042303.
Texto completoResumen
Cognitive and emotional developmental trajectories account for individual differences in children. Individual variations of emotional intelligence may be a result of various factors. For the purpose of this work children’s development of emotional intelligence is examined through individual developmental aspect related to development of cognition and emotion. The ability to be aware of own emotions and emotions of others and being able to regulate own emotions facilitates the highest developmental levels of emotional intelligence. Therefore this work employs emotional intelligence and self-aware emotion regulation as concepts of interchangeable meaning.
The developmental courses of emotion and cognition are inter-related to an extent at which it is unrealistic to categorize them into separate developmental processes. This thesis focuses on multilevel interplay between emotion and cognition in the course of their development. The theories by LeDoux and Levental are integrated to provide a comprehensive theory of interplay between emotion and cognition in children’s development.
While consensus exists about emotional and cognitive development exerting influence over enhancement of emotional intelligence, there is little evidence of how exactly the enhancement is enabled. The structural overview of the emotion-cognition interplay aims at filling the literature gap by recognizing processes which may account for the development of emotional intelligence in children.
This thesis provides implications for the development of emotional intelligence by integrating the levels of emotional awareness model with model of emotional intelligence as an ability. Increasingly more complex mental representations of past events with emotional content enable advancement of emotional awareness. Therefore processing of emotional information shifts from implicit to explicit which enables employment of cognitive function when dealing with emotional information.
As a result of acquired ability of reasoning about emotions child is not only aware of own emotions and emotions of others, but is also able to regulate own emotions according to specific social situations. Self-aware emotion regulation is thereof possible result of cognitive-emotional development and a facilitator for highest levels of emotional intelligence in children.
13
Barger, Pavol. "Evaluation et validation de la fiabilité et de la disponibilité des systèmes d'automatisation à intelligence distribuée, en phase dynamique". Nancy 1, 2003. http://www.theses.fr/2003NAN10222.
Texto completoResumen
L'étude de la sûreté de fonctionnement des systèmes d'automatisation est un sujet qui nécessite la prise en compte de différentes caractéristiques telles que les modes de fonctionnement, la présence d'un réseau de communication, etc. Des méthodes d'étude existent mais aucune ne peut être appliquée avec une vue d'ensemble. L'approche proposée consiste en une analyse du comportement dynamique, à la fois du point de vue fonctionnel et dysfonctionnel. Les Réseaux de Petri colorés (CPN) sont utilisés pour la modélisation de chaque composant et l'analyse est faite par une simulation de Monte Carlo sur le logiciel Design/CPN. L'apport original de la thèse consiste en proposition d'une approche permettant à la fois la conception des composants et de leur intégration pour constituer un système complet, par l'utilisation d'un outil unique permettant d'intégrer des points de vue à l'interface de trois communautés : l'automatique, l'informatique et la sûreté de fonctionnementThe control systems dependability study is a task in which different characteristics have to be taken into account, such as functioning modes, communication network presence, etc. Some study methods exist but their application fields cannot represent the system globally. The approach proposed is based on the dynamic behavior analysis considering both functional and malfunctional behavior with a focus on the dynamic system configuration (state/phase). Colored Petri Nets (CPN) are used for modeling. Monte Carlo simulation is the main analysis method and is implemented in the Design/CPN software. The main study results include a proposition of system components models and the subsequent analysis by simulation. The original contribution is the proposition of one unified approach enabling the components modeling as well as their connection while using one single tool and expressing the viewpoints common to three areas: control systems, computer engineering and dependability assessment
14
Oberholzer, Jan Adriaan. "Die invloed van persoonlikheid op die studiehouding van 'n groep kinderhuiskinders / Jan Adriaan Oberholzer". Thesis, Potchefstroom University for Christian Higher Education, 1997. http://hdl.handle.net/10394/7844.
Texto completoResumen
This research is done with focus on a children' s home child, who is deviated by factors out of his control, but who is helped to unfurl to adulthood, so that he can have the same future vision as other children. where he has to compete to a position in a fast developing labour market. The aim of this study, by way of literature study, and supported by emperical research is to determine what the study attitude of a children' s home child is. This study attitude is analysed according to factors which give direction to it, especially the influence of personality on study attitudes. Background knowledge is gained about personality and the etiology/origin of personality characteristics, with the meaning that educators in their guidance of children to optimum personality development also bearing the study attitudes in mind. An attitude inventory is developed and implemented in order to obtain more information about the study attitudes of children' s home children in the senior primary school phase. Children from one children' s home were involved in this study after the attitude inventory' s reliability and validity was tested at another children' s home. The information obtained is statistically revised by the statistics consultation services ofthe PU for CHO. The results ofthe investigation was thereafter analysed to give positive recommendation to the practise and to do further research. Throughout this study reference to he means he/she, his means hislhers and him meaning him/her.Thesis (MEd)--PU for CHE, 1998
15
Jaeck, Vincent. "Développement d’antennes de communication reconfigurables en bande C pour munitions intelligentes". Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S104/document.
Texto completoResumen
De nos jours, les communications sans fil sont devenues un moyen incontournable et universel d'échange d'un large éventail d'informations entre différents systèmes, certains d'entre eux étant en mouvement comme des drones parmi tant d'autres. Dans le contexte de cette thèse nous considérons une liaison entre un projectile et une station de base. La géométrie de la structure ainsi que les contraintes aérodynamiques d'un tir balistique impliquent l'utilisation d'antennes patchs dans la partie conique à l'avant du projectile. Ce type d'antenne est facile à intégrer à une plate-forme en tant que réseau conformé tout en respectant les contraintes d'encombrement. Ces communications doivent être fiables et discrètes dans un environnement perturbé ou hostile. Les diagrammes de rayonnement du réseau d'antennes doivent présenter des caractéristiques spécifiques, notamment dans le cas particulier d'objets volants et possédant une rotation en roulis (rotation autour de son axe) qui impliquent l'utilisation d'un réseau phasé et commuté par rapport à sa position. Une antenne qui présenterait un rayonnement fixe assurerait une liaison avec un interlocuteur, mais rayonnerait également dans d'autres directions sensibles ce qui pourraient interférer avec la communication principale. La solution qui consiste à activer et désactiver des sous-réseaux verticaux afin d'orienter le lobe principal dans la plan orthogonal à la pointe semble être en accord avec les contraintes de la structure tournante. Un réseau conique a été étudié puis 2 prototypes ont été fabriqués, dont un à l'ISL. Les sous-réseaux sont répartis de manière égale autour de la pointe de façon à pouvoir rayonner dans toutes les directions. De plus, chaque sous-réseau est composé de trois éléments ce qui permet d'orienter également le lobe principal dans le plan longitudinal de la pointe (le long de l'axe du projectile) grâce à un dépointage électronique. Un système électronique de formation de faisceaux a été développé dans le but de contrôler 12 éléments rayonnants. Le réseau d'antennes ainsi que le circuit de répartition ont été caractérisés dans un premier temps de manière indépendante afin d'optimiser les lois de phase nécessaires à dépointer le lobe à partir des pondérations mesurées. Au final, le réseau de 12 éléments associé à son système d'alimentation dédié a été mesuré dans les chambres anéchoïques de DGA-MI et de l'ISL et les mesures sont en accord avec les simulationsNowadays wireless communications have become a useful and universal mean to exchange a wide range of information between different systems, some of them being moving, as UAVs among others. In this context we consider here the link between a projectile and a base station. The shape of the structure and the aerodynamic constraints involve the use of patch antennas in the conical front part. This class of antenna is easy to be integrated into the platform as a conformal array, while respecting space constraint. Communications have to be reliable and discrete in disturbed or hostile environment. Antennas array radiation patterns must have some specific characteristics, in particular in the case of flying objects with spin which involves the use of a switched phased array considering its roll position. A fixed-radiation pattern antenna may presents a relevant level or gain toward the interlocutor, but also toward sensitive directions, in which may be located others systems, interfering with the current communication. The solution to switch on and off vertical sub-arrays to steer the beam in the azimuthal plane seem convenient ant fitting the requirements of rotating platform. A conical phased array was studied and two prototypes were manufactured, one at ISL. Sub-arrays are distributed around the conical shape in order to be able to radiate in each direction. Moreover, each sub-array are composed of three radiating elements allowing to steer the main antenna beam in many direction (along the projectile fuze axes). A beam forming network was developed to control the 12 radiating elements conical array. The antenna array and the feeding network were characterized independently in order to optimized the phase of each radiating element. Finally, measurements were done on the whole system in the DGA-MI and ISL anechoic chambers and are in good agreement with simulation results
16
Denis, Gil y Alain Pizzinato. "Prise de décision et intelligence artificielle dans les sports d'opposition : Exemple de la phase de service-retour de service en tennis". Nancy 1, 1992. http://docnum.univ-lorraine.fr/public/SCD_T_1992_0063_DENIS_PIZZINATO.pdf.
Texto completoResumen
La prise de décision en sport d'opposition a déjà fait l'objet de nombreuses études mobilisant des approches très diverses. Notre originalité se situe dans la volonté d'envisager une analyse pluridimensionnelle de la structure du processus décisionnel. La démarche adoptée est celle de l'intelligence artificielle. L'activité sportive support est le tennis. Il s'agit donc d'identifier les concepts manipulés par un expert de l'activité tennis, et la dynamique des relations qu'ils entretiennent entre eux. Deux types de connaissances seront évoqués: la connaissance des faits (base des faits) et la connaissance des règles de la structure et de comportement du système (base des connaissances). Ce sont donc les données qui vont guider le processus décisionnel et non des fonctions préalablement déterminées. Ce travail de formalisation a permis d'élaborer un système explicatif du processus décisionnel dans la phase de service-retour de service. Le but majeur est de fournir, pour chaque échange, une prédiction de la stratégie adaptée à la situation analysée, de la zone visée et du type de balle utilisé. Ces prévisions sont accompagnées d'un coefficient de probabilité d'apparition exprimé en pourcentage. Une des caractéristiques essentielles de ce système réside dans sa faculté à apprendre le comportement des joueurs en présence grâce à une structure gérant les événements dans leur temporalité. Nomme L. I. F. T. (logique informatique pour la formalisation des connaissances en tennis), ce modèle est accompagné d'un programme logique simulant un moteur d'inférences gérant une base de connaissances.
17
Ragb, Hussin Khalifa Alfitouri. "Multi-Hypothesis Approach for Efficient Human Detection in Complex Environment". University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1541210403653549.
Texto completo
18
Fadlallah, Najib. "Contribution à l'optimisation de la synthèse du lobe de rayonnement pour une antenne intelligente : Application à la conception de réseaux à déphasage". Limoges, 2005. http://aurore.unilim.fr/theses/nxfile/default/2b3c153f-58e2-4152-a5cd-53cf1fc0ae35/blobholder:0/2005LIMO0008.pdf.
Texto completoResumen
Ce mémoire s'inscrit dans le cadre d'un projet CEDRE (Collaboration entre l'université de Limoges et l'université Libanaise) sur le thème des antennes intelligentes dans les radio- communications mobiles. Le travail a consisté en une contribution à l'optimisation du lobe de rayonnement pour une antenne intelligente. Deux approches complémentaires ont été développées pour implémenter la technique de formage du lobe, une basée sur un algorithme d'optimisation qui calcule les phases des excitations en fonction des spécifications désirés (lobe pointé, multi- lobes, création des zéros) et l'autre utilisant les résultats de la première technique pour implémenter un modèle avec des réseaux de neurones. La première méthode a un inconvénient concernant le temps de calcul (quelques seconds), la deuxième est quasiment une application en temps réel. La prise en compte de l'effet de couplage sur le rayonnement a été implémentée directement dans la technique de synthèse, et une validation pratique de cet effet a été réalisée. De nombreuses mesures d'une antenne réseau 8 éléments, excités seulement en phase, ont permis de valider nos outils développés. This report joins within the framework of a project CEDRE (Collaboration between the University of Limoges and the Lebanese university) on the topic of the intelligent antennas in the radio mobile communications. Work consisted with a contribution to the optimization of the lobe of radiation for an intelligent antenna. Two complementary approaches were developed to implement the technique of forming of the lobe, one based on an algorithm of optimization which calculates the phases of the excitations according to the specifications desired (pointed lobe, multiple lobes and creation of the zeros) and the other using the results of the first technique to implement a model with networks of neurons. The first method has a disadvantage concerning the computing time (some seconds), the second is almost an application in real time. The taking into account of the effect of coupling on the radiation was implemented directly in technique of synthesis, and a practical validation of this effect was carried out. Many measurements of an antenna arrays 8 elements, excited only in phase, made it possible to validate our developed tools
19
Miftah, el kheir Laila. "Smart devices for biomedical applications". Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD054.
Texto completoResumen
Dans cette thèse, nous nous sommes intéressés aux systèmes intelligents pour des applicationsmédicales et cosmétiques. Ainsi, nous avons conçu et réalisé trois instruments. Le premier estdédié à la mesure de la mouillabilité de la peau. L’originalité de ce dispositif réside en sa capacité àdonner une image 3D de la goûte de la surface de la peau explorée et de donner le comportementdynamique de la goûte. Cette stratégie nous donnera la possibilité de créer de nouvelles basesde données relatives à la mouillabilité de tout le corps humain. En effet, nous disposons que desdonnées sur la mouillabilité de l’avant-bras. Le deuxième instrument intelligent concerne la mesurede la réflectance d’une surface. Ce dispositif assure une mesure de très haute résolution angulairede la BRDF et une très bonne répétabilité de la mesure. Il a été validé sur la peau pour la mesurede l’ éclat. Et enfin le troisième instrument, basé sur une méthode originale de mesure de vibrationà l’aide d’un système de stéréo-vision associée à un motif périodique. Il a été appliqué pour lamesure du mouvement thoracique et abdominal lors de la respiration. Notre principale motivationpour développer ce système fut la réduction des artefacts, dus aux mouvements d’un patient lorsd’un examen radiologiqueSmart Devices have been widely used by health care and cosmetics professionals. Indeed, they helpin many aspects of clinical practice by providing an efficient way for medical diagnosis, supportingbetter clinical decision-making and improving patient outcomes. In this thesis, we have beeninterested in three applications. The first one is related to the wettability measurement, especially forthe human skin. So we propose, a held-hand device that is based on the contact angle measurementto determine skin wettability. Besides, the device allows the visualization of the liquid dropletspreading in both dynamic and static modes. Moreover, it can measure the top and the left views ofthe droplet and provides the 3D droplet and the skin explored area profiles. The second applicationpermits the skin radiance measurement. For this purpose, we propose a miniaturized device havingan original method for the BRDF measurement associated with 3D profile measurement of the areastudied. As regards the third application, it is a non-invasive method for breath measurement that usesa stereovision system and a pseudo-periodic pattern. This system allows a high-resolution threedimensionaldisplacement measurement for the recording of the thoracoabdominal wall respiratorymovement. The devices developed during this research gives us a high accuracy, a good resolutionand repeatability of measurements
20
Souza, Kleymilson do Nascimento. "Optimization in calculation of active part three phase distribution transformer with use genetic algorithms aiming better efficiency and less cost". Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8364.
Texto completoResumen
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel SuperiorThe present work is a study of a methodology that seeks to be more economical and efficient compared to traditional methods, the design of three phase distribution transformers. To this end, we use a tool of Computational Intelligence, based on previous calculations made in the traditional way by manufacturing industries and books that address this matter. It is evident here, another way to design the active part of the transformer, the dimension of the core and coil, for this, used Genetic Algorithms (GA) which will assist in the calculation and selection of parameters, providing the best choice of design of the transformer, minimizing, on average, 5% in the cost and losses in 2.5% as input parameters the following standard. With changes in the fitness function of GA, one can simply adapt to new requirements and standards. As a result of using the genetic algorithm can find a design solution that is more efficient than that used by the manufacturers. The losses calculated values meet established by NBR-5440.
O presente trabalho faz um estudo de uma metodologia que busca ser mais econÃmica e eficiente, em comparaÃÃo com mÃtodos tradicionais, no projeto de transformadores de distribuiÃÃo trifÃsico. Para tal, utiliza-se uma ferramenta de InteligÃncia Computacional, tendo como base cÃlculos anteriores feitos de forma tradicional por indÃstrias fabricantes e livros que tratam desse assunto. Evidencia-se, aqui, mais uma maneira de projetar a parte ativa do transformador, ou seja, o dimensionamento do nÃcleo e bobinas; para isso, utiliza-se Algoritmos GenÃticos (GA), que irÃo auxiliar no cÃlculo e escolha dos parÃmetros, proporcionando a melhor escolha do projeto do transformador, minimizando, em mÃdia, o custo em 5 % e as perdas em 2,5 %, conforme parÃmetros de entrada seguindo a norma. Com modificaÃÃes na funÃÃo de fitness do GA, pode-se adequar de maneira simples a novas exigÃncias e normas. Como consequÃncia da utilizaÃÃo do Algoritmo GenÃtico pode-se encontrar uma soluÃÃo de projeto que à mais eficiente do que a utilizada pelos fabricantes. As perdas calculadas atendem valores estabelecidos pela norma NBR-5440.
21
Sari-Bey, Sana. "Mise au point de nouveaux matériaux à changement de phase pour optimiser les transferts énergétiques". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1158.
Texto completoResumen
Les recherches dans le domaine des matériaux innovants possédant une meilleure efficacité énergétique présentent un enjeu environnemental majeur. L'un des moyens d'économiser l'énergie est le stockage. L'utilisation des matériaux à changement de phase est une solution permettant d'absorber, de stocker et de restituer de grandes quantités d'énergie. Ce travail porte sur l'étude expérimentale des propriétés thermophysiques et des changements de phase de matériaux composites à matrice polymère contenant un matériau à changement de phase microencapsulé et sur l'optimisation de ces propriétés. Des composites contenants différentes fractions massiques de microcapsules de paraffine ont d'abord été caractérisés. Afin d'améliorer le transfert thermique des microcapsules de paraffine métallisées avec de l'argent ont ensuite été utilisées. Une nouvelle série d'échantillons a été réalisée. Dans les composites la matrice polymère choisie est le polycaprolactone (PCL), ce polymère a une température de fusion particulièrement faible (53°C), qui permet de le mélanger aux microcapsules sans les détériorer. Les mélanges polymère/microcapsules ont été réalisés à l'aide d'un mélangeur interne, ils ont ensuite été pressés pour obtenir des plaques de composites. L'homogénéité des échantillons a été vérifiée en faisant des observations au microscope électronique à balayage et des mesures de densité. Le matériau à changement de phase utilisé est un mélange de paraffines qui a une température de changement de phase de 26°C, microencapsulé dans du PMMA hautement réticulé, et commercialisé par la société BASF® sous la dénomination commerciale de Micronal® DS 5001 X. Le PCL a une température de fusion inférieure à la température de ramollissement du PMMA. Un des objectifs de cette étude était d'obtenir un matériau qui reste solide même quand la paraffine fond. La microencapsulation a permis cela en évitant que la paraffine ne diffuse hors de l'échantillon lors de cycles successifs, elle permet également d'éviter les phénomènes de convection quand la paraffine est liquide. D'autre part, un autre objectif était de voir si la métallisation des particules permettait d'améliorer les propriétés thermiques en augmentant significativement la conductivité et la diffusivité thermique. La DSC a été utilisée pour connaître les températures et les enthalpies de changements de phase ainsi que les Cp des matériaux entre -20 et 40 °C. Une technique expérimentale développée au laboratoire (DICO) permet de mesurer simultanément la conductivité thermique (λ) et la diffusivité thermique (a) à température ambiante. Une évolution récente de ce dispositif permet maintenant de faire des mesures en rampe en température entre -15°C et 180°C. Les mesures de l'évolution de la conductivité et de la diffusivité thermique en fonction de la température ont donc été réalisées en chauffe et en refroidissement. Les changements de phase observés en DSC se retrouvent sur l'évolution de la conductivité et de la diffusivité thermiques tracées en fonction de la température. On voit également l'impact de l'état solide ou liquide de la paraffine contenue dans les microcapsules sur ces propriétés. Enfin l'évolution de la capacité calorifique volumique a pu être calculée à partir des résultats obtenus avec la DICO (Cp=λ/a) et comparée à l'évolution de la capacité calorifique massique mesurée en DSC. Globalement le transfert thermique a été amélioré pour les composites contenant des Micronal® argentés mais leur capacité de stockage est inférieure aux composites ne contenant que des Micronal®Research in the field of innovative materials with improved energy efficiency have a major environmental issue. One way to save energy is storage. The use of phase change materials (PCM) is a solution for absorbing, storing and releasing large amounts of energy. This study focuses on the experimental study of the thermophysical properties and phase changes of polymer matrix composite materials containing microencapsulated PCM and the optimization of their thermophysical properties. Composite containing different mass fractions of paraffin microcapsules were first characterized. To improve heat transfer, paraffin microcapsules metallized with silver were then used. A new set of samples was elaborated. In the composite the selected polymer matrix is polycaprolactone (PCL), this polymer has a particularly low melting point (53°C), which allows to mix the microcapsules without damaging them. The polymer/microcapsules mixtures were prepared using a blender, they were then pressed to obtain plates of composites. The homogeneity of the samples was verified by scanning electron microscopy observations and density measurements. The phase change material used is a mixture of paraffins having a phase change temperature of 26°C, in microencapsulated highly crosslinked PMMA, and marketed by BASF under the trade name of Micronal®DS 5001 X. PCL has a melting temperature lower than the softening temperature of PMMA. One objective of this study was to obtain a material that remains solid even when the paraffin melts. Microencapsulation has avoided that the paraffin in the sample diffuses out during successive cycles, it also avoids convection when paraffin is liquid. On the other hand, another goal was to see if metallization of the particles allowed to improve the thermal properties by significantly increasing the thermal conductivity and diffusivity. DSC was used to determine the temperatures and enthalpies of the phase changes and the materials Cp between -20 and 40 ° C. An experimental technique, developed in the laboratory (DICO), can simultaneously measure the thermal conductivity (λ) and thermal diffusivity (a) at room temperature. A recent development of this system now allows to make measurements in ramp between -15°C and 180°C. The measures of the change in thermal conductivity and diffusivity as a function of temperature have been carried out by heating and cooling. Phase changes observed in DSC are found on the evolution of thermal conductivity and thermal diffusivity plotted as a function temperature. It also shows the impact on these properties of solid or liquid state of the paraffin contained in the microcapsules. Finally the evolution of the volumetric heat capacity was calculated from the results obtained with DICO (Cp=λ/a) and compared with the evolution of the specific heat capacity measured by DSC. Globally, heat transfer was improved for composites containing silver but their storage capacity is lower than for the composites containing only Micronal®
22
Minotti, Cristiano. "Estimador fuzzy de velocidade para motores de indução trifásicos usando abordagem sensorless". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-15102008-135246/.
Texto completoResumen
O uso da tecnologia sensorless é uma tendência crescente para acionamentos industriais aplicados em máquinas elétricas. A estimação dos parâmetros elétricos e mecânicos envolvidos com o controle da máquina elétrica são utilizados freqüentemente para se evitar medir todas as variáveis envolvidas no processo. A redução de custos em acionamentos industriais, além do incremento da robustez do sistema, são algumas das vantagens do uso de técnicas sensorless. Este trabalho propõe o uso de lógica fuzzy para estimar a velocidade de rotação de motores de indução trifásicos. Estão presentes resultados de simulações computacionais e comparação com outras técnicas inteligentes para validação da abordagem apresentada.The use of sensorless technologies is an increasing tendency on industrial drives for electrical machines. The estimation of electrical and mechanical parameters involved with the electric machine control is used very frequently in order to avoid measurement of all variables from this process. The cost reduction may also be considered in industrial drives, besides the increasing robustness of the system, as advantages of the use of sensorless technologies. This work proposes the use of fuzzy logic to estimate the speed in three-phase induction motors. Simulation results are presented to validate the proposed approach and comparative analyses with other intelligent techniques are also outlined.
23
Batista, Luciana [UNESP]. "A gênese da organização fonético-fonológica da fala". Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/91257.
Texto completoResumen
Made available in DSpace on 2014-06-11T19:24:57Z (GMT). No. of bitstreams: 0
Previous issue date: 2005-09-19Bitstream added on 2014-06-13T20:52:54Z : No. of bitstreams: 1
batista_l_me_mar.pdf: 301132 bytes, checksum: cc34ffbc650427600130594a247e6d0a (MD5)A fala ou a necessidade de conversar não nasce bruscamente quando a criança emite suas primeiras palavras. O marco da aquisição dos fonemas, geralmente, é datado ao redor dos dezoito a vinte quatro meses, quando a criança é capaz de expressar-se oralmente de acordo com os padrões de uma língua. Mas, antes deste acontecimento, há uma etapa determinante na aquisição de tal conhecimento, denominada período sensório-motor. A evolução deste período é estudada quase sempre em função do meio social ou de estruturas inatas, independentes da evolução da inteligência, ou seja, da atividade da criança na interação com o meio. Com o objetivo de compreender a gênese da organização fonético-fonológica da fala na criança, realizou-se, neste trabalho, o estudo evolutivo das condutas vocais de crianças de três a dezoito meses, relacionando-as aos estágios do desenvolvimento sensório-motor descrito por Piaget. A pesquisa experimental demonstrou que as condutas sonoras produzidas no período sensório-motor evoluem correlativamente ao desenvolvimento da inteligência, em função da atividade e da interação da criança em seu meio, prolongando-se na fala estruturada de acordo com os padrões da língua.
Speech or the need to talk doesn't just suddenly start when a child says its first words. The period that phonetic sounds are acquired by a child, is usually about the time it starts to speak, that is when it is eighteen to twenty four months of age, when a child is able to express itself orally, by the standards of a language. But, before this happens, there is a phase that is important in speech acquisition, known as the motor-sensorial phase. The evolution of the speech acquisition period, is nearly always studied considering factors such as the child's social background and innate structures, independently of the evolution of the child's intelligence, that is, interaction with what surrounds it. In order to better understand the phonetic-phonological organization of children's speech, this study of the vocal evolution of children aged three to eighteen months, was made to determine the stages of motor-sensory development, described by Piaget. Experimental research work showed that the sounds emitted prior to the motor sensory phase, evolve towards intelligence development, and the amount of interaction the child has with it's surroundings, leads to speech that is structured by the standards of a language.
24
Batista, Luciana. "A gênese da organização fonético-fonológica da fala /". Marília : [s.n.], 2005. http://hdl.handle.net/11449/91257.
Texto completoResumen
Orientador: Adrian Oscar Dongo MontoyaBanca: Lourenço Chacon Jurado Filho
Banca: Jaime Luiz Zorzi
Resumo: A fala ou a necessidade de conversar não nasce bruscamente quando a criança emite suas primeiras palavras. O marco da aquisição dos fonemas, geralmente, é datado ao redor dos dezoito a vinte quatro meses, quando a criança é capaz de expressar-se oralmente de acordo com os padrões de uma língua. Mas, antes deste acontecimento, há uma etapa determinante na aquisição de tal conhecimento, denominada período sensório-motor. A evolução deste período é estudada quase sempre em função do meio social ou de estruturas inatas, independentes da evolução da inteligência, ou seja, da atividade da criança na interação com o meio. Com o objetivo de compreender a gênese da organização fonético-fonológica da fala na criança, realizou-se, neste trabalho, o estudo evolutivo das condutas vocais de crianças de três a dezoito meses, relacionando-as aos estágios do desenvolvimento sensório-motor descrito por Piaget. A pesquisa experimental demonstrou que as condutas sonoras produzidas no período sensório-motor evoluem correlativamente ao desenvolvimento da inteligência, em função da atividade e da interação da criança em seu meio, prolongando-se na fala estruturada de acordo com os padrões da língua.
Abstract: Speech or the need to talk doesn't just suddenly start when a child says its first words. The period that phonetic sounds are acquired by a child, is usually about the time it starts to speak, that is when it is eighteen to twenty four months of age, when a child is able to express itself orally, by the standards of a language. But, before this happens, there is a phase that is important in speech acquisition, known as the motor-sensorial phase. The evolution of the speech acquisition period, is nearly always studied considering factors such as the child's social background and innate structures, independently of the evolution of the child's intelligence, that is, interaction with what surrounds it. In order to better understand the phonetic-phonological organization of children's speech, this study of the vocal evolution of children aged three to eighteen months, was made to determine the stages of motor-sensory development, described by Piaget. Experimental research work showed that the sounds emitted prior to the motor sensory phase, evolve towards intelligence development, and the amount of interaction the child has with it's surroundings, leads to speech that is structured by the standards of a language.
Mestre
25
Santos, Fernanda Maria da Cunha. "Identificação de falhas em motores de indução trifásicos usando sistemas inteligentes". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-29042013-114436/.
Texto completoResumen
Esta tese consiste em desenvolver um sistema de identificação e classificação de falhas em motores de indução trifásico. As falhas analisadas foram simuladas em laboratório e envolvem problemas elétricos, como curto-circuito no estator, e problemas mecânicos, como barras quebradas no rotor. O sistema computacional proposto é formado pela transformada discreta wavelet, pelo cálculo de variáveis estatísticas e por redes neurais artificiais. A partir dos sinais elétricos da corrente do estator, a transformada wavelet produz os coeficientes característicos das falhas, os quais são usados no cálculo das variáveis estatísticas, como a média, root mean square, skewness e kurtosis. Estes valores são transmitidos como dados de entrada para as redes neurais que identificam as falhas e classificam a natureza das mesmas. Por fim, resultados obtidos visam validar a metodologia sugerida, que buscou nos sistemas inteligentes soluções eficazes para diagnosticar falhas em máquinas elétricas.This thesis consists in developing a system for the identification and classification of faults in three-phase electric motors. The faults were analyzed and simulated in the laboratory and involve electrical problems, such as short circuit in the stator, and mechanical problems, such as broken rotor bars. The proposed computer system is formed by discrete wavelet transform, by calculation of statistical variables and for artificial neural networks. From the electrical signals of the stator current, the wavelet transform produces characteristic coefficients of faults, which are extracted by calculating of statistics variables, such as mean, root mean square, skewness and kurtosis. These values are passed as input to the neural networks that identify faults and the severity of it. Finally, results aimed at validating the methodology suggested that sought effective solutions in intelligent systems to diagnose faults in electrical machines.
26
Dabo, Marcelin. "Commande prédictive généralisée non linéaire à temps continu des systèmes complexes". Phd thesis, Université de Rouen, 2010. http://tel.archives-ouvertes.fr/tel-00497319.
Texto completoResumen
Nous abordons, dans cette thèse, la poursuite asymptotique de trajectoire basée sur la commande prédictive généralisée non linéaire à temps continu (NCGPC). L'application de cette technique de commande requiert la vérification d'assomptions précises. La NCGPC est caractérisée par deux paramètres : le degré relatif et l'horizon de prédiction, respectivement, intrinsèque et extrinsèque au système. Sa loi de commande résulte de la minimisation d'un critère quadratique basée sur l'erreur de prédiction (jusqu'à un ordre égal au degré relatif) entre la(es) sortie(s) choisie(s) et le(es) signal(aux) de référence correspondant(s). Elle linéarise le système non linéaire en boucle fermée dans un nouvel espace de coordonnées et lui garantit la stabilité (degré relatif inférieur ou égal à quatre) de facto. Au-delà de quatre, il y a instabilité. Pour résoudre ce problème, Chen et al. ont introduit un troisième paramètre, qui est l'ordre des dérivées successives de la commande par rapport au temps, choisi de sorte que sa différence avec le degré relatif soit inférieure à quatre. Nous proposons dans ce travail, deux approches qui vérifient les mêmes assomptions mentionnées ci-dessus et dont les points communs sont la modification du critère avec le maintien à zéro de l'ordre des dérivées successives de la commande et la garantie de la stabilité pour le système linéaire bouclé résultant. La première approche consiste au rajout d'un terme linéaire en commande au critère, tandis que la deuxième consiste au rajout d'une matrice de correction "intelligente" à la matrice de prédiction du critère. Quelques propriétés de la NCGPC sont données pour des systèmes SISO de degré relatif un ou deux.
27
Dinh, Van Binh. "Méthodes et outils pour le dimensionnement des bâtiments et des systèmes énergétiques en phase d'esquisse intégrant la gestion optimale". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT092/document.
Texto completoResumen
Dans le but de réduire la consommation d’énergie et d’augmenter la part des énergies renouvelables, la conception optimale des futurs bâtiments (bâtiments intelligents) apparaît comme un facteur important. Cette thèse vise donc à développer des modèles, des méthodes innovantes d’aide à la conception pour ces bâtiments. Notre nouvelle approche de conception est une optimisation globale et simultanée de l’enveloppe, des systèmes énergétiques et de leurs stratégies de gestion dès la phase d’esquisse, qui prend en compte plusieurs critères de coût (investissement et exploitation) et de confort (thermique, visuel et aéraulique). Le problème d’optimisation multi-objectif est donc un problème de couplage fort de grande taille avec de nombreuses variables et contraintes, qui induisent des difficultés lors de sa résolution. Après avoir fait des analyses sur des cas tests, une méthode d’optimisation d’ordre 1 est choisie, en association à des modèles analytiques dérivés formellement de manière automatique. Notre méthodologie est appliquée à la conception de maisons individuelles, et plus particulièrement des maisons à énergie positive. Les résultats obtenus par cette approche globale apportent des informations importantes aux concepteurs pour l’aider à faire des choix en phase amont du processus de conceptionIn order to reduce the energy consumption and to increase the use of renewable energy, the optimal design of future buildings (smart-buildings) appears as an important factor.This thesis aims to develop models, innovative methods aiding decision-making during the design of buildings. Our approach of design is a global and simultaneous optimization of envelope, energy systems and their management strategies from the sketch phase, which takes into account multi-criterions of costs (investment et exploitation) and comforts (thermal, visual, aeraulic). The multi-objective optimization problem is so a strong coupling problem of large scale with a lot of variables and constraints, which leads to difficulties to solve.After the tests, an optimization method of order 1 is chosen in combination with analytical models formally derived automatically. Our methodology is applied to the design of individual houses, especially positive energy houses. The results of this global approach provide important information to designers to help make choices from the preliminary phase of the design process
28
Suetake, Marcelo. "Sistemas inteligentes para monitoramento e diagnósticos de falhas em motores de indução trifásicos". Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-26062012-164520/.
Texto completoResumen
O objetivo desta tese consiste na implementação de sistemas inteligentes para monitoramento e diagnósticos de falhas ocorrentes em motores de indução trifásicos. Para tanto, desenvolveu-se uma bancada de experimentos que visa ensaios de falhas relacionados a curto-circuito entre as bobinas do enrolamento de estator, quebras nas barras da gaiola de esquilo do rotor e, finalmente, rolamentos defeituosos. Mais especificamente, o enfoque principal consiste na proposição de uma abordagem neural de detecção de quebras nas barras de rotores de motores de indução trifásicos mediante a análise do espectro de frequência e aplicação de técnicas de análise das componentes principais. Considerou-se o acionamento do motor de indução tanto pela tensão de alimentação da rede quanto por inversor trifásico em diferentes frequências, operando sob diversas condições de torque de carga para a avaliação da metodologia.The objective of this thesis consists of the implementation of intelligent systems for three-phase induction motors fault diagnosis and condition monitoring. Therefore, an experimental test stand for stator winding inter-turn short circuit faults, broken rotor bar in squirrel cage and, finally, defective wheel bearing has been designed. The main focus is to propose a neural network approach, which uses spectral frequency analysis and principal component analysis techniques to detect broken rotor bar in squirrel cage induction motor. Induction motor operating at different load torque conditions and supplied with sinusoidal voltage supply and three-phase inverter at different frequency was considered in the experiment for methodology evaluation.
29
Hardas, Manas Sudhakar. "SEGMENTATION AND INTEGRATION IN TEXT COMPREHENSION: A MODEL OF CONCEPT NETWORK GROWTH". Kent State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=kent1334593269.
Texto completo
30
Godoy, Wagner Fontes. "Multiclassificador inteligente de falhas no domínio do tempo em motores de indução trifásicos alimentados por inversores de frequência". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-03062016-111024/.
Texto completoResumen
Os motores de indução desempenham um importante papel na indústria, fato este que destaca a importância do correto diagnóstico e classificação de falhas ainda em fase inicial de sua evolução, possibilitando aumento na produtividade e, principalmente, eliminando graves danos aos processos e às máquinas. Assim, a proposta desta tese consiste em apresentar um multiclassificador inteligente para o diagnóstico de motor sem defeitos, falhas de curto-circuito nos enrolamentos do estator, falhas de rotor e falhas de rolamentos em motores de indução trifásicos acionados por diferentes modelos de inversores de frequência por meio da análise das amplitudes dos sinais de corrente de estator no domínio do tempo. Para avaliar a precisão de classificação frente aos diversos níveis de severidade das falhas, foram comparados os desempenhos de quatro técnicas distintas de aprendizado de máquina; a saber: (i) Rede Fuzzy Artmap, (ii) Rede Perceptron Multicamadas, (iii) Máquina de Vetores de Suporte e (iv) k-Vizinhos-Próximos. Resultados experimentais obtidos a partir de 13.574 ensaios experimentais são apresentados para validar o estudo considerando uma ampla faixa de frequências de operação, bem como regimes de conjugado de carga em 5 motores diferentes.Induction motors play an important role in the industry, a fact that highlights the importance of correct diagnosis and classification of faults on these machines still in early stages of their evolution, allowing increase in productivity and mainly, eliminating major damage to the processes and machines. Thus, the purpose of this thesis is to present an intelligent multi-classifier for the diagnoses of healthy motor, short-circuit faults in the stator windings, rotor broken bars and bearing faults in induction motors operating with different models of frequency inverters by analyzing the amplitude of the stator current signal in the time domain. To assess the classification accuracy across the various levels of faults severity, the performances of four different learning machine techniques were compared; namely: (i) Fuzzy ARTMAP network, (ii) Multilayer Perceptron Network, (iii) Support Vector Machine and (iv) k-Nearest-Neighbor. Experimental results obtained from 13.574 experimental tests are presented to validate the study considering a wide range of operating frequencies and also load conditions using 5 different motors.
31
Vu, Duc Tan. "Commande tolérante aux défauts des entraînements de machines synchrones à aimants permanents polyphasées non-sinusoïdales sous contraintes de courant et de tension pour les applications automobiles". Electronic Thesis or Diss., Paris, HESAM, 2020. http://www.theses.fr/2020HESAE040.
Texto completoResumen
Les entraînements électriques pour les véhicules électrifiés doivent répondre à certaines exigences spécifiques des marchés automobiles, tels qu'un rendement élevé, des densités volumiques élevées de puissance et de couple, un coût faible avec une protection contre les risques électriques, une fiabilité fonctionnelle élevée et une qualité de couple élevée. Dans ce contexte, les entraînements de machines synchrones à aimants permanents (PMSM) polyphasées sont devenus des candidats appropriés pour répondre aux exigences citées ci-dessus. L’objectif principal de cette thèse de doctorat vise à proposer et affiner des stratégies de commandes tolérantes aux défauts pour les entraînements de machines PMSM polyphasées non-sinusoïdales qui requièrent moins de contraintes lors de leur conception. Par ailleurs, les contraintes de courant et de tension définies par l’onduleur et la machine sont prises en compte pour optimiser en régime non-sinusoïdal le contrôle de la machine sans dépasser leurs limites admissibles. Cela permet idéalement un dimensionnement au plus juste et cela tout particulièrement dans la zone de défluxage. Les stratégies proposées de commandes tolérantes aux défauts, basées sur le modèle mathématique des entraînements polyphasés, enrichissent le domaine de contrôle des entraînements polyphasés en offrant de diverses options de contrôle. Le choix de l'une des options proposées de commande peut être un compromis entre un couple de haute qualité mais avec une valeur moyenne faible, et un couple moyen élevé mais avec une ondulation relativement élevée. Les performances de contrôle et de couple peuvent être affinées en utilisant l'intelligence artificielle avec un type simple de réseaux de neurones artificiels nommé ADALINE (neurone linéaire adaptatif). Grâce à leur capacité d'auto-apprentissage, à leur convergence rapide et à leur simplicité, les ADALINE peuvent être appliqués aux entraînements polyphasés industriels. Toutes les stratégies de contrôle proposées dans cette thèse de doctorat sont validées avec un entraînement d’une machine PMSM à sept phases. La force électromotrice non-sinusoïdale de la machine PMSM à sept phases, relevée expérimentalement, est complexe avec la présence de plusieurs harmoniques. Les résultats expérimentaux vérifient l'efficacité des stratégies proposées, et leur applicabilité dans une machine polyphasée avec une force électromotrice non-sinusoïdale complexeElectric drives for electrified vehicles need to fulfil some specific requirements from automotive markets such as high efficiency, high volume power and torque densities, low-cost but safe-to-touch, high functional reliability, high torque quality, and flux-weakening control. In this context, multiphase permanent magnet synchronous machine (PMSM) drives have become suitable candidates to meet the above requirements. The main objective of this doctoral thesis is to propose and refine fault-tolerant control strategies for non-sinusoidal multiphase PMSM drives that require less constraints on their design. In addition, constraints on current and voltage defined by the inverter and the machine are considered to optimize the machine control under the non-sinusoidal condition without exceeding their allowable limits. Therefore, the system sizing is guaranteed, especially in flux-weakening operations. The proposed fault-tolerant control strategies, based on the mathematical model of multiphase drives, enrich the control field of multiphase drives by providing various control options. The selection of one of the proposed control options can be a trade-off between a high quality torque but a low average value and a high average torque but a relatively high ripple. The control and torque performances of the drives can be refined by using artificial intelligence with a simple type of artificial neural networks named ADALINE (ADAptive LInear NEuron). With self-learning ability, fast convergence, and simplicity, ADALINEs can be applied to industrial multiphase drives. All proposed control strategies in this doctoral thesis are validated with an experimental seven-phase PMSM drive. The non-sinusoidal back electromotive force (back-EMF) of the experimental seven-phase PMSM is complex with the presence of multi-harmonics. Experimental results verify the effectiveness of the proposed strategies, and their applicability in a multiphase machine with a complex non-sinusoidal back-EMF
32
Schulz, Jakub. "Zdroj pro pulzní magnetronové naprašování". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217246.
Texto completoResumen
The presented thesis deals with the design and assembly of the generator for pulse magnetron sputtering. The designed device is capable of generating two square wave signals via its counter-working outputs. Both signals have independently adjustable frequency, pulse count and duty ratio. Both signals originate from two frequency syntheses controlled by microcontroller PIC16F877A. All the settings are entered by four buttons and are shown on an alphanumeric display with 16x4 characters. The duty ratio is adjusted using a special module.
33
Al, Ghossini Hossam. "Contributions to the study of control for small-scale wind turbine connected to electrical microgrid with and without sensor". Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2310/document.
Texto completoResumen
L'objectif de cette thèse est de proposer l'approche la plus appropriée afin de minimiser le coût d'intégration de petite éolienne dans un micro-réseau DC urbain. Une petit éolienne basé sur un machine synchrone à aimant permanent (MSAP) est considéré à étudier. Un état de l'art concernant les énergies renouvelables, micro-réseau DC, et la production d'énergie éolienne, est fait. Comme le capteur mécanique de cette structure est relativement d'un coût élevé, les différents types de contrôle pour un système de conversion éolienne sont présentés afin de choisir une structure active de conversion d'énergie et un MSAP sans capteur. Par conséquent, un estimateur de vitesse/position est nécessaire pour contrôler le système. Ainsi, les méthodes différentes proposées dans la littérature sont considérées et classifiées à étudier dans les détails, puis les plus efficaces et largement utilisés sont à vérifier dans la simulation et expérimentalement pour le système étudié. Les méthodes choisies sont: estimation de la flux de rotor avec boucle à verrouillage de phase (PLL), observateur à mode glissement (SMO), observateur de Luenberger d'ordre réduit, et filtre de Kalman étendu (EKF). Face à d'autres méthodes, l'estimateur basé sur un modèle EKF permet une commande sans capteur dans une large plage de vitesse et estime la vitesse de rotation avec une réponse rapide. Le réglage des paramètres EKF est le problème principal à sa mise en œuvre. Par conséquent, pour résoudre ce problème, la thèse présente une méthode adaptative, à savoir réglage-adaptatif d’EKF. En conséquence, et grâce à cette approche, le coût total du système de conversion est réduite et la performance est garantie et optimiséeThe aim of this thesis is to propose the most appropriate approach in order to minimize the cost of integration of a wind generator into a DC urban microgrid. A small-scale wind generator based on a permanent magnet synchronous machine (PMSM) is considered to be studied. A state of the art concerning the renewable energies, DC microgrid, and wind power generation is done. As the mechanical sensor for this structure is relatively of high cost, various types of wind conversion system control are presented in order to choose an energy conversion active structure and a sensorless PMSM. Therefore, a speed/position estimator is required to control the system. Thus, different methods proposed in literatures are considered and classified to be studied in details, and then the most effective and widely used ones are to be verified in simulation and experimentally for the studied system. The methods which are chosen are: rotor flux estimation with phase locked loop (PLL), sliding mode observer (SMO), Luenberger observer of reduced order, and extended Kalman filter (EKF). Facing to other methods, the EKF model-based estimator allows sensorless drive control in a wide speed range and estimates the rotation speed with a rapid response. The EKF parameters tuning is the main problem to its implementation. Hence, to solve this problem, the thesis introduces an adaptive method, i.e. adaptive-tuning EKF. As a result and grace to this approach, the total cost of conversion system is reduced and the performance is guaranteed and optimized
34
Korniienko, Anton. "Réseau de PLLs distribuées pour synthèse automatique d'horloge de MPSOCs synchrones". Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00676933.
Texto completoResumen
Les arbres classiques de distribution du signal d'horloge au sein des microprocesseurs synchrones présentent un certain nombre de limitations : skew, jitter, limitation de la fréquence, influence de perturbations et de dispersions quelles que soient leurs natures. Ces facteurs, critiques pour les microprocesseurs modernes complexes, sont devenus la raison principale qui a poussé à la recherche d'autres types d'architecture de génération et de distribution du signal d'horloge. Un exemple d'un tel système alternatif est le réseau de PLLs couplées, où les PLLs sont géographiquement distribuées sur la puce, et génèrent des signaux d'horloge locaux qui sont ensuite synchronisés, en temps réel, par un échange d'information entre les PLLs voisines et une rétroaction locale réalisé par leur correcteurs. La nature active du réseau de PLLs de génération et de distribution du signal d'horloge, qui peut permettre de surpasser les limitations mentionnées plus tôt, oblige à sortir du cadre classique des outils et des méthodes de la Microélectronique habituellement appliqués à l'étude et à la conception de ce type de systèmes. En effet, les aspects dynamiques de bouclage et de transformation de signaux au sein de tels systèmes complexes rendent leur conception extrêmement difficile voire parfois impossible. La difficulté principale consiste en un changement des propriétés d'un sous-système local indépendant par rapport aux propriétés du même sous-système faisant partie du réseau. Effectivement, il existe beaucoup de méthodes et d'outils de conception d'une PLL isolée garantissant un comportement et des propriétés locales désirés. Néanmoins, ces propriétés désirées locales, selon la topologie d'interconnexion considérée, ne sont pas forcément conservées quand il s'agit d'un réseau de PLLs interconnectées et de son comportement global. Le but principal de cette thèse est ainsi de développer une méthode de synthèse de la loi de commande décentralisée réalisée au sein de chaque sous-système (tel qu'une PLL) assurant le comportement désiré pour le réseau global. Une méthode de transformation du problème de synthèse globale en un problème équivalent de synthèse d'une loi de commande locale est proposée en se basant sur l'hypothèse des sous-systèmes identiques interconnectés en réseau. Le lien entre les propriétés locales et globales est établi grâce aux approches d'Automatique avancée telles que les approches entrée-sortie et la dissipativité. Ce choix de méthode permet non seulement de réduire considérablement la complexité du problème initial mais aussi de ramener le problème de synthèse à une forme proche des méthodes de conception locale utilisées en Microélectronique, ce qui garantit une continuité logique de leur évolution. Ensuite la méthode proposée est combinée avec la commande H∞ et l'optimisation sous contraintes LMIs conduisant au développement d'algorithmes efficaces de résolution du problème posé. Elles sont à la fois particulièrement bien adaptées à l'application considérée, c'est-à-dire à la synchronisation d'un réseau de PLLs, et sont facilement généralisables aux autres types de problèmes de commande de systèmes de grande dimension. Le premier aspect permet une intégration naturelle et aisée de la méthode dans le flux de conception existant en Microélectronique, très riche et mature à ce jour, alors que le deuxième offre une solution à d'autres problèmes de commande de systèmes interconnectés en réseau, un champ d'application aujourd'hui en plein essor.
35
Lai, Yu-Kai y 賴煜凱. "Intelligent Photovoltaic Power System with Three-Phase Unbalanced Load Current Compensation". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/uff69k.
Texto completoResumen
碩士國立中央大學
電機工程學系
106
A improved method is proposed to compensate the three-phase unbalanced currents of power grid under three-phase unbalanced load for a two-stage photovoltaic (PV) power system without the augmentation of active power filter (APF). The PV power system is composed of an interleaved DC/DC converter and a three-level neutral-point clamped (NPC) inverter. Moreover, the PV power system possesses the smart inverter function, in which the output active and reactive powers of the PV inverter are predetermined by a power factor according to grid codes of the utilities. In the proposed method, -axis compensation currents are obtained through low pass filters (LPFs) to compensate the three-phase unbalanced currents of power grid. Furthermore, in order to improve the control performance of the DC bus voltage of the PV power system under unbalanced load variation condition, an online trained compensatory neural fuzzy network with an asymmetric membership function (CFNN-AMF) is proposed to replace the traditional proportional-integral (PI) controller for the DC bus voltage control. In the proposed CFNN-AMF, the compensatory parameter to integrate pessimistic and optimistic operations of fuzzy systems is embedded in the CFNN. In addition, the dimensions of the Gaussian membership functions are directly extended to AMFs. Additionally, the proposed controllers of the PV power system are implemented by two control platforms using floating-point digital signal processor (DSP). Finally, excellent compensation performance for the three-phase currents of power grid under three-phase unbalanced load can be achieved from the experimental results.
36
Lu, Kuang-Chin y 呂光欽. "Intelligent Power Control System of Three-Phase Grid-Connected PV System". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/90117545732400970594.
Texto completoResumen
博士國立中央大學
電機工程學系
104
A PC-based intelligent power control system of the three-phase grid-connected photovoltaic (PV) system for active and reactive power control during grid faults is developed in this dissertation. Two fuzzy-neural-network (FNN) based intelligent controllers are proposed to perform the intelligent power control system to regulate the active and reactive power of the grid-connected PV system satisfying the low voltage ride through (LVRT) requirements and ensuring the injected currents within the safety value of the three-phase inverter. The first proposed intelligent controller is the probabilistic wavelet fuzzy neural network (PWFNN) controller, which combines the merits of probabilistic FNN (PFNN) and wavelet FNN (WFNN). The other is the Takagi-Sugeno-Kang type probabilistic fuzzy neural network with asymmetric membership function (TSKPFNN-AMF) controller, which is the combination of the characteristics of the Takagi-Sugeno-Kang type fuzzy neural network (TSKFNN), asymmetric membership function (AMF) and probabilistic neural network (PNN). Both PWFNN and TSKPFNN-AMF controllers are good at dealing with a complex nonlinear system with uncertainty, complexity, and strong nonlinearities. Since the three-phase grid-connected PV system, which includes PV panel, boost converter, three-phase inverter and grid, can be regarded as a nonlinear system with uncertainty, it is very difficult to develop a physical nonlinear model for the system. Traditional controller such as proportional-integral (PI) controller is difficult to guarantee the desired control performance with the presence of plant parameter variations and unknown external disturbances due to the linearity characteristic of a PI controller. Therefore, the proposed PWFNN and TSKPFNN-AMF controllers can be adopted to develop a system with learning capability for nonlinear systems with uncertainties and be adopted to control the active and reactive power of the grid-connected PV system during grid faults. Moreover, a formula for evaluating the percentage of voltage sags is derived to determine the ratio of the injected reactive current to satisfy the regulations. To reduce the risk of over-current during LVRT operation, a current limit is predefined for the injection of reactive current. Furthermore, a dual mode operation control method of the converter and inverter of the three-phase grid-connected PV system is proposed to balance the active power between the PV panel and the three-phase inverter and maximize the three-phase inverter power capability via injecting the full-rated current during grid fault. To achieve this objective, the control system applies the mode II operation strategy to curtail the active power to ensure the maximum rated current is not surpassed. In addition, the network structure, online learning algorithm, and convergence analysis of the proposed intelligent controllers are described in detail. An emulated 1kW grid-connected three-phase PV system is settled and tested to verify the performance of the proposed intelligent power control system. Various types of voltage sags and test scenarios are designed to investigate the LVRT capability of the grid-connected PV system. The experimental results show that although the control performances of the proposed controllers are superior to other controllers such as PI, FNN and WFNN, higher complexity of structure and current harmonic distortion of injected current during grid faults are the main defects. Additionally, some benchmarks of these controllers are also provided to evaluate the control performances.
37
Chia-Lung, Cheng. "GPS Carrier Phase Frequency Syntonization with the Dynamic Intelligent Adaptive Forecasting Filter". 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-3006200617163800.
Texto completo
38
Cheng, Chia-Lung y 程家龍. "GPS Carrier Phase Frequency Syntonization with the Dynamic Intelligent Adaptive Forecasting Filter". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/77241063984199584231.
Texto completoResumen
博士國立臺灣大學
電機工程學研究所
94
A low-cost, highly-accurate GPS carrier phase frequency syntonization system (GPS carrier phase-disciplined oscillator, GPSCDO) based on a single-frequency receiver is presented. The scheme can allow traceability to the international time and frequency as disseminated by the GPS. The system can be used in stratum II time/frequency standards, such as site syntonization systems, event measurement, etc. Furthermore, the GPSCDO can monitor atmospheric variations applied to earthquake prediction or meteorology when the dynamic intelligent adaptive forecasting filter is turned off. To estimate the average frequency offsets of an oscillator with respect to the GPS, the oscillator was connected to a time/frequency GPS receiver to replace its original oscillator. Hence, the behavior of the oscillator was determined from the GPS carrier phase observations. The average frequency offsets of the oscillator with respect to the GPS could be estimated by performing difference operations on carrier phase observations of all satellites in view between two measurement epochs. To reduce the interference of the atmospheric delay, a real-time dynamic intelligent adaptive forecasting filter (DIAFF) was proposed. The corrected average frequency offsets were then used by the switch controller to steer the OCXO through a D/A converter. The parameters of the DIAFF were obtained according to the results of an eight-day experiment, in which the GPS carrier phase observations of a stand-alone configuration with a primary clock are recorded for each satellite. The DIAFF can be available to correct locally (smaller than 50 Km) average atmospheric differential delays in real time. The circumstances of the users can be considered in creation of the DIAFF. The DIAFF is available easily and provides day-to-day robustness under regular atmosphere. In addition, the DIAFF is better than the Klobuchar model from the frequency stability analyses of the medium term and long term in the local area. The GPSCDO with the DIAFF can be improved on the estimates of normalized frequency offset of the OCXO with respect to the Cs. clock from the order of 10 to that of 10 and the frequency stability (MDEV) from the order of 10 to that of 10 over 24 hours. Furthermore, the GPSCDO with the DIAFF is better than the commercial GPS disciplined oscillator (GPSDO) from the frequency stability analyses of the short term (10s) and medium term (10000s) in the local area. The decentralized adaptive atmospheric delay correction processes improve frequency syntonization performance of the users, and reduce the cost of the apparatus for the National Metrology Institute (NMI). In addition, a great quantity of computation can be distributed over the users equally.
39
Chen, Jun-Hao y 陳俊豪. "Design and Implementation of Three-Phase Active Power Filters with Intelligent Control". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5d6ac3.
Texto completoResumen
碩士國立中央大學
電機工程學系
105
A three-phase three-arm active power filter (APF) is proposed to compensate harmonic current under nonlinear load conditions in grid-connected operation in this study. In order to improve the regulation control of the DC-link voltage in the shunt APF under the variation of nonlinear load and to compensate the currents harmonic effectively, a novel recurrent probabilistic fuzzy neural network with an asymmetric membership function(RPFNN-AMF) controller is proposed to replace traditional proportional-integral (PI) controller. Moreover, a three-phase four-arm inverter-based active power filter is also proposed to compensate three-phase unbalanced currents under unbalanced load conditions in grid-connected operation in this study. Furthermore, to improve the regulation control of the DC-link voltage in the APF under the variation of three-phase unbalanced load and to compensate the three-phase unbalanced currents effectively, a novel Petri probabilistic fuzzy neural network (PPFNN) controller is proposed to replace traditional PI controller. In addition, the network structure, online learning algorithms and convergence analysis of the proposed two intelligent controllers are represented respectively in detail. Finally, the proposed two intelligent controllers to control the APF are implemented by the control platform using the Texas Instruments digital signal processor (DSP) TMS320F28335, and the effectiveness and the feasibility are verified by some experimental results.
40
Wu, Jia-Yong y 吳家勇. "Plan and Design of Intelligent Digital Single-phase Meter to Support Demand Response". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/23639784682274891144.
Texto completoResumen
碩士國立高雄應用科技大學
電機工程系
99
The thesis proposes an energy management for demand response system. The intelligent digital single-phase meter uses RS-485 and ZigBee as communication medium and integrates microprocessor with energy metering IC and switch power supply. It can be easily installed without requesting modification of original circuits of a user. The meter can support power company to reach control of demand response for customers and achieve the effect of carbon reduction. The master station reads the power consumption of appliances through the RS-485 or ZigBee interface in the meter. The energy management system which is designed by Visual Basic transmits the measured data from the meter to the master station and displays on the screen of the master station. The function of the meter can support the analysis of reasonable demand to help users to understand current status of used electricity. That will improve the users electricity consumption habits for the purposes of peak load shaving and bill cut.
41
WeiHan-Sheng y 魏漢昇. "Intelligent Speed Control of Three-Phase Induction Motor Based on Programmable Logic Controller". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/34814348705718964375.
Texto completoResumen
碩士崑山科技大學
電機工程研究所
94
The motor control technique based on programmable logic controller (PLC) has the advantages of good operation quality and superior control performance during on-off instant. Hence, provided that it belongs to the general purpose of motor drive and control, the industrial circles are used to utilize the PLC based PID control method to substitute for the traditional driving technique in order to simplify the control circuit components and satisfy the control requirements. To further promote the performance of motor control for PLC, this thesis combines fuzzy theory and artificial neural network to the close-loop speed control of induction motor. The fuzzy theory adopts the human language to replace the complicated mathematics model. For one highly non-linear system or in which the differential equation is not easy to be obtained, the fuzzy theory can offer a simpler control method. In addition, in order to have the fuzzy control strategy to be implemented easily in the PLC ladder program, this thesis utilizes ANN to learn the fuzzy inference rules in order to further simplify the control model. To verify the feasibility of the proposed method, this thesis employs one three-phase induction motor to fulfill the experiment. Furthermore, to provide the personification man-machine interface, this thesis also combines the VB software and RS485 module to carry out the distributed monitor of three-phase induction motor that it can reaches the monitor requirement of one PC monitors several motors.
42
Li, Yuan-Fang y 李元芳. "Simulation and Experimentation of Wind-Driven Three-Phase Induction Generator System Using Intelligent Control". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/21409140178312974214.
Texto completoResumen
碩士國立東華大學
電機工程學系
93
An intelligent controlled wind turbine emulator and induction generator (IG) system with an AC/DC power converter is developed in this study. The electric frequency of the IG is controlled using the indirect field-oriented control mechanism. Moreover, a power converter is adopted to convert the electric power generated by a three-phase IG from variable-frequency and variable-voltage to constant DC voltage. The rotor speed of the IG, the DC-link voltage and current of the power converter are detected simultaneously to yield maximum power output of the IG through DC-link power control. In this thesis, first, the indirect field-oriented mechanism is designed for the control of the IG. Since the IG system is nonlinear and time-varying, an on-line trained recurrent fuzzy neural network (RFNN) with backpropagation algorithm is then developed as the tracking controller of DC-link power to improve the control performance. In addition, a closed-loop wind turbine emulator also using the RFNN is designed to produce maximum power for the IG system at various wind speeds. Then, some experimental results are provided to show the effectiveness of the proposed wind turbine emulator and IG system using RFNN controller. The performance of the wind-driven induction generator system is also simulated using PSIM and Simulink. In the simulation, a power converter and a DC/AC power inverter are adopted and operated in both the stand-alone or grid-connected mode. Moreover, some simulated results are given to verify the design of the wind-driven induction generator system.
43
Tsai, Meng-ting y 蔡孟庭. "Development of Intelligent Fault Tolerant Control for Six-Phase Permanent Magnet Synchronous Motor Drive System". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/84925446080846369419.
Texto completoResumen
碩士國立中央大學
電機工程研究所
100
The objective of this thesis is to develop and implement a digital signal processor (DSP) based fault tolerant control of six-phase permanent magnet synchronous motor (PMSM) drive system. This system is suitable for industrial applications such as mechanical tools, electric vehicles and some specific applications. The six-phase PMSM drive system is highly nonlinear and is very sensitive to parameter variations and external disturbance. When the motor winding or the respective inverter is broken, the torque fluctuation will appear due to unbalanced current and the motor will operate under non-smooth situation. Therefore, the fault detection and operating decision method is proposed in the thesis to prevent serious broken. Since, the stability and the fault tolerant control are the most important issues of the six-phase PMSM drive and control system, therefore, two intelligent control systems, which can improve the control performance and the requirements of stability of fault tolerant control of six-phase PMSM drive system, are proposed: a Takagi-Sugeno-Kang type fuzzy neural network with asymmetric membership function (TSKFNN-AMF) controller and an intelligent complementary sliding-mode controller (ICSMC). The network structure and the online learning algorithms of the intelligent controller are introduced in detail. Moreover, the proposed control systems are implemented in a TMS320F28335 DSP to verify the feasibility of the proposed control schemes.
44
Hsu, Chia-Wei y 許家瑋. "Application of Intelligent Motor Control System for Control and Protection of Three-Phase Induction Motor". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/56521156678651408559.
Texto completoResumen
碩士國立臺灣海洋大學
電機工程學系
100
Motor control center (MCC) is widely used in the industry. The conventional MCC consists of electrical and mechanical components and apparatus and all connections are in the form of hard wiring. The task of troubleshooting often needs to make measurements with a large number of components and control points, which is labor-intensive with high maintenance cost and time. In recent years, the Intelligent Motor Control Systems (IMCCs) are gaining development and applications. The IMCCs use new intelligent components and network technology and will be able to identify the type of motor fault more quickly. In this thesis, the functions of IMCC motor protection is applied to the diagnosis of motor faults with the detection of imbalances in voltage and current. The conditions under study are carbon deposits on the electromagnetic contactor and open line circuit faults of an induction motor. An experimental platform for the diagnosis of motor faults includes an IMCC, an induction motor, a personal computer equipped with Matlab/Simulink and LabVIEW, a magnetic contactor, and resistors with numerous values resistance. Some function codes, including motor fault simulation, virtual instrumentation, and fault diagnosis, are implemented in the personal computer. Experiment works consist of both the software simulation and hardware emulation of motor faults and practical detections. It is found that the IMCC will assist the maintenance crew in diagnosing the motor faults.
45
Ranjith, Ameetha. "Foundation phase educator's conceptualisations of emotional intelligence and its influence on teaching". Thesis, 2012. http://hdl.handle.net/10413/9630.
Texto completoResumen
This study focused on foundation phase educators‟ understanding of emotional intelligence and how this understanding influenced their teaching.
The concept of emotional intelligence has emerged from the growing realisation that there are factors beyond cognitive performance which contribute to success in life. Emotional intelligence may be described as the recognition and management of emotions in oneself as well as in others. It has been found to be beneficial in a wide variety of settings including that of education.
The study was qualitative in nature and was located within the interpretive paradigm. In order to investigate the understanding of the concept by the foundation phase educators and how this understanding impacted their teaching, the data production tools of semi structured interviews, questionnaires and observations were utilised.
The findings were analysed and discussed according to themes. The findings revealed that the foundation phase educators had an inadequate understanding of many aspects of emotional intelligence which consequently-impacted their teaching accordingly.Thesis (M.Ed.)-University of KwaZulu-Natal, Durban, 2012.
46
Juan, Kai-Chun y 阮開駿. "Intelligent Control of Six-Phase Permanent Magnet Synchronous Motor Drive System for Electric Power Steering System". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90463892602004376035.
Texto completoResumen
碩士國立中央大學
電機工程學系
101
The purpose of this thesis is to develop a digital signal processor (DSP) based intelligent control of six-phase permanent magnet synchronous motor (PMSM) drive system for electric power steering (EPS) system. Due to the EPS system is a nonlinear and time-varying system, the control accuracy is very sensitive to the parameter variations and external disturbances. Since the stability of EPS system is the most important issue, two intelligent control systems are proposed in this thesis. First, an improved differential evolution wavelet fuzzy neural network with asymmetric membership function (IDE WFNN-AMF) is proposed, in which the learning rates of IDE WFNN-AMF are adapted online. Then, an intelligent two-order sliding-mode controller (I2OSMC) is proposed, in which the uncertainties of the EPS system is estimated using the WFNN-AMF with online learning and fast convergence capabilities. The above two intelligent controllers can achieve the required high control performance of the EPS system. Finally, the six-phase PMSM drive system is implemented by the DSP TMS320F28335, and some experimental results are illustrated to verify the validity of the proposed intelligent controllers.
47
Hung, Ying-Chih y 洪英智. "Intelligent Fault Tolerant Control of Six-Phase Permanent Magnet Synchronous Motor Drive System for Light Electric Vehicle". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/99318277481360638251.
Texto completoResumen
博士國立中央大學
電機工程學系
101
In recent years, due to the greenhouse effect and fossil energy shortage, the concept of carbon reduction and energy saving has been valued highly. Therefore, the market of the internal combustion engine vehicles will be impacted seriously due to the increasing price of fossil fuel. Moreover, to consider the possible change of the habit of driver and the development of the public transportation in the future, light electric vehicles (LEVs) with high energy efficiency and low emissions are believed to be the best choice of transportation in the future. On the other hand, fault tolerant control for a motor drive system enables a motor to continue operating properly in the event of the failure. The fault tolerant control motor drive system is suitable for industrial applications such as mechanical tools, aerospace technology, vehicle technology, compressors, robotic arms, robots, electric vehicles (EVs) and some specific applications. For the above reasons, the purpose of this dissertation is to develop a digital signal processor (DSP)-based intelligent fault tolerant control of six-phase permanent magnet synchronous motor (PMSM) drive system. Furthermore, the developed intelligent fault tolerant control motor drive system will be applied to an in-wheel motor drive system in LEV to fulfill the requirements of the safety and system stability in LEV applications. In this dissertation, the DSP-based control system using a 32-bit floating-point DSP, TMS320F28335, and the six-phase PMSM drive system are presented in detail first. Then, the dynamics of the six-phase PMSM is analyzed and derived. Moreover, the six-phase PMSM drive system is a highly nonlinear system and is very sensitive to the parameter variations and external disturbance. When the motor winding or respective inverter is broken, the unbalanced current will cause torque fluctuation so that the motor may be operated under a non-smooth situation and lead to a serious damage. Thus, the fault tolerant control for the six-phase PMSM drive system should be considered. Hence, the fault detection and operating decision method is proposed in this dissertation. Furthermore, the dynamics of LEV and in-wheel motor drive system are described in detail. In addition, two control approaches including Takagi-Sugeno-Kang type fuzzy neural network with asymmetric membership function (TSKFNN-AMF) control and intelligent complementary sliding mode control (ICSMC), which combines the merits of complementary sliding mode control (CSMC) and TSKFNN-AMF, are proposed to improve the control performance and to maintain the stability of the fault tolerant control six-phase PMSM drive system under faulty condition. Additionally, a probabilistic fuzzy neural network (PFNN) control is proposed to control the fault tolerant control six-phase PMSM drive system for an in-wheel motor drive system in LEV, and to achieve high control performance of the LEV and to maintain the stability of the in-wheel motor drive system under faulty condition. The fault tolerant control with PFNN of in-wheel motor drive system can provide better acceleration and deceleration control performance of the vehicle when the vehicle is accelerated or decelerated promptly and make the driving more comfortable with safety for the driver and the passengers. Finally, according to the experimental results, the developed intelligent fault tolerant control of six-phase PMSM drive system possesses good control performance and fault tolerance ability, and can apply to the in-wheel motor drive system in LEV effectively.
48
Zhao, Feng. "Phase Space Navigator: Towards Automating Control Synthesis in Phase Spaces for Nonlinear Control Systems". 1991. http://hdl.handle.net/1721.1/5982.
Texto completoResumen
We develop a novel autonomous control synthesis strategy called Phase Space Navigator for the automatic synthesis of nonlinear control systems. The Phase Space Navigator generates global control laws by synthesizing flow shapes of dynamical systems and planning and navigating system trajectories in the phase spaces. Parsing phase spaces into trajectory flow pipes provide a way to efficiently reason about the phase space structures and search for global control paths. The strategy is particularly suitable for synthesizing high-performance control systems that do not lend themselves to traditional design and analysis techniques.
49
Beukes, Christopher John. "Employability and emotional intelligence of the individual within the school-to-work transition phase". Thesis, 2010. http://hdl.handle.net/10500/4096.
Texto completoResumen
Youth employability in South Africa has become an important focus for career counsellors. This
study investigated the relationship between the employability (as measured by the Southern
African Employability Inventory) and emotional intelligence (as measured by the Assessing
Emotions Scale) of individuals within the school-to-work transition phase. A random sample of
590 Grade 9 and Grade 12 further education and post-school (recently exited) students from a
total population of 1349 participated in the study. The research findings indicated that
participants’ level of employability is significantly related to their emotional intelligence.
Recommendations are postulated for the career counselling of individuals in the school-to-work
career transition phase.Industrial and Organisational Psychology
M.Com. (Industrial and Organisational Psychology)
50
Gomes, Veronica Ann. "Guidelines for the educational psychologist in the assessment of mathematics in the foundation phase". Thesis, 2008. http://hdl.handle.net/10210/355.
Texto completoResumen
The aim of this study was to investigate guidelines for the educational psychologist in the assessment of foundation phase mathematics. The investigation takes place in the light of Outcomes-based education, which is a new practice of education in South Africa, within the paradigm of post-modernism. Outcomes-based education framed within the National Curriculum Statement, has necessitated far-reaching changes in education and assessment alike. Educational psychology has not been untouched and the field has had to re-look its approach to assessment. Therefore, it has been necessary for educational psychologists in South Africa to develop an approach to the assessment of foundation phase mathematics that will yield credible information in order to support the learner in the best way possible. Educational psychologists have tended to use standardised mathematics tests and IQ tests exclusively when assessing foundation phase learners in mathematics. But, the emphasis of an educational psychological assessment is moving from, not only discovering the learner’s IQ score and the grade or age level that they function at mathematically but also, to question ‘why’ the specific learner is not making progress, ‘what’ the learner can or can’t do, and from the teacher’s point of view, ‘how’ the child can best be helped. This can be achieved by making use of the curriculum as the starting point for the assessment and then assessing each task using an approach which encompasses a dynamic and assetbased approach, where the assessor seeks to understand the learner's areas of personal strength and assets in mathematics. A qualitative interpretivistic design was used in this study. The research methods employed were a literature search of existing literature including mathematics documents, a focus-group interview with foundation teachers from a local primary school, an interview with a lecturer of educational psychological assessment and an incomplete-sentences questionnaire completed by second year masters’ degree students in the educational psychology programme─ both at the University of Johannesburg. A content analysis of two documents─ the National Curriculum Statement (NCS) (2002) and the Principles and Standards for School Mathematics (2000), an American mathematics curriculum─ revealed that the NCS (2002) seems to be based, because of the similarities and at times the exactness of content, on the Principles and Standards for School Mathematics (2000) The value of the process undertaken was that both the documents provide insight into how curriculum-based assessment could be carried out. The constant comparative method of analysis was used to analyse the focus group interview, the individual interview and the incomplete questionnaires. The findings confirm that the changes in education have impacted on educational psychologists’ ‘medical model’ approach to assessment and on the way in which they have been used to working. Educational psychologists’ when carrying out an assessment should aim to ascertain how much an individual has learnt and whether support for learning is required. They should use a variety of assessment tools which should result in a comprehensive understanding of the learner resulting in feedback and a report that is meaningful to teachers and parents.Dr. Elzette Fritz Mrs. Raine Pettipher