Rozprawy doktorskie na temat „Advanced machine controls”
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Ma, Yu Ph D. Massachusetts Institute of Technology. "Machine learning in ocean applications : wave prediction for advanced controls of renewable energy and modeling nonlinear viscous hydrodynamics". Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127057.
Pełny tekst źródłaCataloged from the official PDF of thesis.
Includes bibliographical references (pages 144-150).
Many conventional problems in ocean engineering remain challenging due to the stochastic nature of ocean waves, viscous effects of the flow, nonlinear resonance, etc., and the combination of these factors. Data-driven techniques is an prospective approach complementary to traditional methods to model physical problems since data from experiments, field tests or high-fidelity simulations are mostly informative about actual physical systems. Machine learning algorithms, especially kernel based methods have very good generalization capability as well as statistical inference. This thesis targets to establish a framework that how we can use data from real-time measurements or data gathered from experiments and field tests and simulations to provide an alternative approach for physical modeling or practical engineering solutions.
In this thesis, we mainly target two different types of problems-mapping highly nonlinear physical relations and predicting time series, to prove the feasibility of such a framework. More specifically, one problem is the short-term wave prediction based on realtime measurements and its application to the advanced controls of renewable energy. The other one is the modeling of nonlinear viscous hydrodynamic loads of ships and offshore platforms. The Support Vector Machines (SVM) is used in solving both the problems. In the thesis, the SVM regression model are developed for the realtime short-term forecast of wave elevations and wave excitation forces. Optimal controllers aiming to reduce the structural loads or optimize energy capture with the knowledge of the forecasted wave force are established for offshore floating wind turbines and wave energy converters.
A series of CFD simulations of a rectangular barge with bilge keels are conducted and validated, along with the experiment data of a fixed offshore cylindrical platform, to serve as the baseline data set to model the nonlinear viscous hydrodynamic loads. Using the wave elevations and ship roll kinematics as features, the SVM regression models are trained and tested to predict the nonlinear hydrodynamic loads. The influence of the stochastic effect and different feature selections and kernel selections are discussed in the thesis as well. Key words: Machine learning, SVM regression, short-term forecast, model predictive control, nonlinear viscous hydrodynamic loads
by Yu Ma.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Mechanical Engineering
Bouyahia, Omar. "Génération électrique tolérante aux défauts à base de structures multiphasées : comparaison, choix d'une technologie, transfert technologique". Electronic Thesis or Diss., Amiens, 2022. http://www.theses.fr/2022AMIE0040.
Pełny tekst źródłaThe project of this thesis consists in the definition of a fault tolerant multiphase generator allowing to increase the reliability of a production line. In fact, whatever the fossil fuel (oil, gas, coal) or renewable (hydraulic, wind, biomass, solar) primary energy used upstream, it is necessary to transform it into electric energy a conversion chain based on an electric generator. whatever the power level (from kW to MW). This element, basically of three-phase structure, is subject to failures during the loss of a phase. Also, by multiplying the number of phases, the production can continue if there remain three active phases. Nevertheless, even if the generation is still possible, it is necessary to define an intelligent control that adapts to the fault and drives the power converter so as to maintain a clean power generation complying with the rules imposed by the national power grid
BERTO, MATTEO. "Advanced Modeling of Anisotropic Synchronous Machine Drives for Sensorless Control". Doctoral thesis, Università degli studi di Padova, 2022. http://hdl.handle.net/11577/3459855.
Pełny tekst źródłaSynchronous machines are extensively used for home appliances and industrial applications thanks to their fast dynamic response, good overload capability and high energy density. A precise knowledge of the rotor position is required to control efficiently this kind of motors. In most of the applications resolvers or absolute encoders are installed on the rotor shaft. The employment of position sensors leads to significant drawbacks such as the increased size and cost of the system and a lower reliability of the drive, caused by additional hardware and cabling. In sensorless drives motor position is estimated and employed in the machine control. Thus, no position sensor is required by the drive and all the drawbacks entailed by the sensor are eliminated. Moreover, the position estimation could be useful for redundancy in case of system failures. Therefore, position estimation techniques are object of great interest in the electric drives field. Position estimation techniques can be divided into two main categories: methods that are suitable for medium or high speed and techniques suitable for low speed or standstill operations. In the former group the motor position is estimated through a reconstruction of the permanent magnet flux or back electromotive force (back-EMF). In case of synchronous reluctance machines it is possible to reconstruct the extended active flux or back-EMF. Stator voltages and currents measurements are needed for these reconstruction methods. Since these signals amplitude is proportional to the rotor speed, position estimation can be successfully performed only for medium and high speed machine operations. In the low speed range, sensorless schemes exploit the rotor magnetic anisotropy. Thus, position can be estimated only for anisotropic motors, i.e. synchronous reluctance motors (SynRM), permanent magnet assisted synchronous reluctance motors (PMA-SynRM) and interior permanent magnet synchronous motors (IPMSM). The rotor anisotropy is recognized thanks to an high frequency voltage injection in the stator windings. Several injection techniques have been proposed, differing from the signal typology. In particular, high frequency sinusoidal or square-wave carriers are often applied. The position information is usually extracted from the current response through a heterodyning demodulation that entails the use of low pass filters in the position estimator, limiting its dynamic. The aim of the research was proposing a new algorithm to estimate the rotor position from the HF current response, getting rid of the demodulation and its weaknesses. Thus, the ellipse fitting technique has been proposed. Robustness against signal processing delay effects and a reduced number of required filters are the main advantages of this novel approach. The inverse problem related to the ellipse fitting is solved implementing a recursive least squares algorithm. The proposed ellipse fitting technique is not affected by signal processing delay effects, and it requires the tuning of only one parameter, called forgetting factor, making the studied method suitable for industrial application thanks to its minimal setup effort. Besides the ellipse fitting technique for rotor position estimation, two other topics have been studied: - Computation of self-sensing capabilities of synchronous machines. - Online incremental inductances identification for SynRM.
VARATHARAJAN, ANANTARAM. "Generalized Sensorless and Advanced Control of Synchronous Reluctance Machines". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2872347.
Pełny tekst źródłaHsieh, Kuang-Han. "Part geometry for advanced quality control and process monitoring /". free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9842539.
Pełny tekst źródłaMilthorpe, Thomas Edward. "Development of advanced control strategies for a dynamic triaxial soil testing machine". Thesis, University of Reading, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590131.
Pełny tekst źródłaJiffri, Shakir. "Advanced passive and active methods for vibration control in rotating machines". Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582112.
Pełny tekst źródłaOuyang, Dingxin. "Intelligent Road Control System Using Advanced Image Processing Techniques". University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1352749656.
Pełny tekst źródłaGao, Yuan, i 高源. "Control of chaos in advanced motor drives". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B45014784.
Pełny tekst źródłaCédric, Peeters. "Advanced signal processing for the identification and diagnosis of the condition of rotating machinery". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI107.
Pełny tekst źródłaThis Ph.D. dissertation targets innovative methods for vibration-based condition monitoring of rotating machinery. Substantial benefits can be achieved from an economical and a safety point of view using condition monitoring. One of the most popular methods to gather information about the state of machine parts is through the analysis of machine vibrations. Most of these vibrations are directly linked to periodical behavior of subsystems within the machine like e.g. rotating shafts, gears, rotating electrical fields, etc. This knowledge can be exploited to enable faultdependent processing schemes. This dissertation investigates how to implement and utilize these processing schemes and details the steps in such a procedure. Typically, the first prerequisite for advanced analysis is the availability of the instantaneous rotation speed. This speed needs to be known since most frequency-based analysis techniques assume stationary behavior. Knowledge of the speed thus allows for compensating speed fluctuations, for example through angular resampling of the vibration signal. While there are hardware-based solutions for speed estimation using angle encoders or tachometers, this thesis investigates the potential in vibration signals for speed estimation. After speed estimation and angular resampling, a common next step is to separate the signal into deterministic and stochastic components. The cepstrum editing procedure is examined for its efficacy and applicability. Afterwards, different filtering methods are inspected as to improve the signal-to-noise ratio of the signal content of interest. Existing methods using conventional criteria are investigated together with a novel blind filtering methodology. The final step in the multi-step processing scheme is to search for the potential fault. Statistical indicators can be calculated on the processed time domain signal and tracked over time to check for increases. In many cases, the fault signature exhibits cyclostationary behavior. Therefore this dissertation also examines different cyclostationary analysis techniques. Lastly, the performance of the different processing methods is validated on two experimental vibration data sets of wind turbine gearboxes
Obeid, Ali. "Scheduling and Advanced Process Control in semiconductor Manufacturing". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2012. http://tel.archives-ouvertes.fr/tel-00847032.
Pełny tekst źródłaGENTILE, ROCCO. "Advanced Diagnostic for Fly-By-Wire Flight Control Systems". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2934682.
Pełny tekst źródłaHussein, Mohamed. "Integrated real-virtuality system and environments for advanced control system developers and machines builders". Thesis, De Montfort University, 2008. http://hdl.handle.net/2086/4910.
Pełny tekst źródłaFernando, Weeramundage Udaya Nuwantha. "Control systems for switched reluctance and permanent magnet machines in advanced vehicular electric networks". Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/control-systems-for-switched-reluctance-and-permanent-magnet-machines-in-advanced-vehicular-electric-networks(ba4d8974-e749-4fbc-b690-824002873a96).html.
Pełny tekst źródłaManzolini, Virginia. "Advanced algorithms for flux-weakening and sensorless control of interior PM and reluctance synchronous motor drives". Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3427316.
Pełny tekst źródłaLe macchine sincrone a magneti permanenti (PMSM) sono sempre più utilizzate in applicazioni domestiche, commerciali e industriali per via della loro superiore efficienza, coppia elevata e alta densità di potenza. Grazie a queste caratteristiche, questo tipo di macchine viene ampiamente utilizzato in diversi campi. Nel settore dei trasporti, la trazione elettrica basata su PMSM sta diventando un forte concorrente dei sistemi di propulsione convenzionali basati su motori a combustione o macchine a induzione. Chiari esempi sono i veicoli elettrici puri e ibridi, i treni, ecc. A causa dei vincoli sempre più stringenti delle classi energetiche, le macchine PMSM stanno conquistando il mercato dei grandi elettrodomestici, ad es. lavatrici e asciugatrici, frigoriferi e condizionatori. Infine, la robotica e i sistemi di alta precisione, le macchine utensili e le applicazioni industriali impiegano sempre più macchine a magneti permanenti per dispositivi ad alte prestazioni ed efficienza. Negli ultimi anni c'è stato un crescente interesse per le macchine a riluttanza sincrona (SyRMs) poiché presentano una superiore affidabilità e sono economicamente vantaggiose a causa dell'assenza di magneti permanenti nel rotore. Per questo la possibilità di sostituire i motori a magneti permanenti presenti nelle esistenti applicazioni con macchine sincrone a riluttanza è di grande interesse per chi lavora nei campi precedentemente citati. Esigenze industriali hanno determinato le attività descritta in questa tesi. In particolare, gli argomenti di ricerca sono stati scelti e sviluppati in base alle specifiche esigenze di E.E.I. S.p.a. (Equipaggiamenti Elettronici Industriali - Vicenza, Italia), il partner industriale che ha finanziato la mia borsa di studio. Due principali temi di ricerca riguardanti il controllo delle macchine sincrone, in particolare IPMSM e SyRM, sono stati individuati. Innanzitutto, la possibilità di sviluppare un algoritmo di controllo in grado di sfruttare la capacità di questi motori di lavorare in un ampio intervallo di velocità. Questo è un aspetto cruciale nella progettazione di un azionamento elettrico poichè consente di evitare il sovradimensionamento del convertitore di potenza e del motore, che a sua volta porta a risparmi di spazio e denaro. Il secondo argomento riguarda l'analisi del controllo sensorless dei motori sincroni. Gli algoritmi di stima della posizione consentono di evitare l'uso di sensori che portando vantaggi in termini di costi e affidabilità dell'azionamento. Per queste ragioni le applicazioni sensorless sono molto interessanti da un punto di vista industriale. Tuttavia, le prestazioni degli algoritmi convenzionali per la stima della posizione a velocità bassa o nulla peggiorano in caso di condizioni di forte saturazione e potrebbero portare perfino all’instabilità dell’algoritmo.
Zonzini, Mirko. "Calibration and advanced control of the PICKABLE robot for the improvement of its dynamic performance". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Znajdź pełny tekst źródłaLe, Ngoc Tien. "Advanced Quality Measures for Speech Translation". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAM002/document.
Pełny tekst źródłaThe main aim of this thesis is to investigate the automatic quality assessment of spoken language translation (SLT), called Confidence Estimation (CE) for SLT. Due to several factors, SLT output having unsatisfactory quality might cause various issues for the target users. Therefore, it is useful to know how we are confident in the tokens of the hypothesis. Our first contribution of this thesis is a toolkit LIG-WCE which is a customizable, flexible framework and portable platform for Word-level Confidence Estimation (WCE) of SLT.WCE for SLT is a relatively new task defined and formalized as a sequence labelling problem where each word in the SLT hypothesis is tagged as good or bad accordingto a large feature set. We propose several word confidence estimators (WCE) based on our automatic evaluation of transcription (ASR) quality, translation (MT) quality,or both (combined/joint ASR+MT). This research work is possible because we built a specific corpus, which contains 6.7k utterances for which a quintuplet containing: ASRoutput, verbatim transcript, text translation, speech translation and post-edition of the translation is built. The conclusion of our multiple experiments using joint ASR and MT features for WCE is that MT features remain the most influent while ASR features can bring interesting complementary information.As another contribution, we propose two methods to disentangle ASR errors and MT errors, where each word in the SLT hypothesis is tagged as good, asr_error or mt_error.We thus explore the contributions of WCE for SLT in finding out the source of SLT errors.Furthermore, we propose a simple extension of WER metric in order to penalize differently substitution errors according to their context using word embeddings. For instance, the proposed metric should catch near matches (mainly morphological variants) and penalize less this kind of error which has a more limited impact on translation performance. Our experiments show that the correlation of the new proposed metric with SLT performance is better than the one of WER. Oracle experiments are also conducted and show the ability of our metric to find better hypotheses (to be translated) in the ASR N-best. Finally, a preliminary experiment where ASR tuning is based on our new metric shows encouraging results.To conclude, we have proposed several prominent strategies for CE of SLT that could have a positive impact on several applications for SLT. Robust quality estimators for SLT can be used for re-scoring speech translation graphs or for providing feedback to the user in interactive speech translation or computer-assisted speech-to-text scenarios.Keywords: Quality estimation, Word confidence estimation (WCE), Spoken Language Translation (SLT), Joint Features, Feature Selection
DELVECCHIO, Simone. "ADVANCED VIBRATION PROCESSING TECHNIQUES FOR CONDITION MONITORING AND QUALITY CONTROL IN I.C. ENGINES AND HARVESTING MACHINES". Doctoral thesis, Università degli studi di Ferrara, 2009. http://hdl.handle.net/11392/2388714.
Pełny tekst źródłaDe, las Casas Zolezzi Humberto Jose. "Model-Free Optimization of Trajectory and Impedance Parameters on Exercise Robots with Applications to Human Performance and Rehabilitation". Cleveland State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=csu1625490714196286.
Pełny tekst źródłaNg, Choon Hoe. "Sensorless vector control of rotary and linear permanent magnet synchronous machines operating at extreme conditions". Thesis, University of Aberdeen, 2003. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU166980.
Pełny tekst źródłaLi, Shengming. "The development and implementation of an advanced power electronics converter and electric machine control technology for flywheel energy storage system applications /". The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486462067843111.
Pełny tekst źródłaArenas, Joshua A. "Evaluation of a Novel Myoelectric Training Device". VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/4050.
Pełny tekst źródłaFares, Adnan. "Development of advanced architectures of power controllers dedicated to Ultra High Switching Frequency DC to DC converters". Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS195.
Pełny tekst źródłaThe continuous sophistication of smart handheld devices such as smartphones and tablets creates an incremental need for improving the performances of the power conversion devices. The trend in power delivery migrates progressively to higher frequency, higher density of integration and flexibility of the control scheme. Dynamic Voltage Scaling Power Management ICs (DVS PMIC) are now systematically used for powering RF Transmitters and DVFS PMICS using Voltage and Frequency scaling are used for CPUs and GPUs. Flexible High frequency (HF) DC/DC converters in conjunction with low dropout LDOs constitute the main solution largely employed for such purposes. The migration toward high frequency/small size DCDC solutions creates serious challenges which are: 1) the stability of the feedback loop across a wide range of loading voltage and current conditions 2) The complexity of the control and often-non-synchronous state machine managing ultra large dynamics and bridging low power and high power operating modes, 3) The portability of the proposed solution across technology processes.The main stream solutions have so far reached the range of 2 to 6 MHz operation by employing systematically sliding mode or hysteretic converters that suffer from their variable operating frequency which creates EMI interferences and lead to integration problems relative to on-chip cross-talk between converters.In this work we aim at extend the use of traditional design and modeling techniques of power converters especially the average modeling technique by putting a particular care on the simplification of the theory and adjunction of flexible compensation techniques that don't require external components and that are less sensitive to process spread, or to high frequency substrate and supply noise conditions.The Small Signal Average Models, widely treated in the existing literature, might address most needs for system modeling and external compensation snubber design, especially when aiming on the high frequency natural zero of the output capacitor. However, HFDCDC converters today use small size MLCC capacitors with a very low ESR which require using alternative techniques mixing the compensation scheme with the duty cycle generation itself. The literature often provides a simplistic state machine description such as PWM/PFM operations but doesn't cover combined architectures of synchronous / non synchronous mode operations such as PWM, PFM, Current Limit, Boundary Clamp, Start, Transitional and finally Fault or Protection modes.In our work, we have focused our study on two main axes: 1) The parametric modeling and the loop compensation of HFDCDC and 2) the scalability of the control state machine and mode inter-operation. In the first part, we provided a detailed small signal averaged model of the “voltage and current mode buck converter” and we depicted it to emphasize and optimize the contributions of the Proportional, Integral and Derivative feedback loops. We demonstrated the ability to use the current feedback to damp and stabilize the converter with a wide variety of loading conditions (resistive or capacitive). In the second part, we provided architecture of the mode control state machine with different modes like the PWM, PFM, soft-start, current limit,… .The technique we have used is inspired by Huffman machine with a significant effort to make it abstract and scalable. The state machine is implemented using RTL coding based on a generic and scalable approach.The theoretical effort has been implemented inside a real PMIC test-chip carrying two 12MHz buck converters, each employing a voltage and current mode feedback loop. The chip has been realized in a 0.5um / 0.18um BiCMOS technology and tested through a dedicate Silicon validation platform able to test the analog, digital and power sections. The key performance obtained is a 50mV load transient undershoot / overshoot during 2us following a load step of 300mA (slope 0.3A/ns)
Ulas, Yaman. "Design Of Advanced Motion Command Generators Utilizing Fpga". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612054/index.pdf.
Pełny tekst źródłaEdgar, Alexander Montero Vera. "Virtual Commissioning of an industrialwood cutter machine : A software in the loop simulation". Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-77401.
Pełny tekst źródłaBaggu, Murali Mohan. "Advanced control techniques for doubly fed induction generator-based wind turbine converters to improve low voltage ride-through during system imbalances". Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Baggu_09007dcc806684bd.pdf.
Pełny tekst źródłaVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 27, 2009) Includes bibliographical references (p. 126-130).
Sala, Cardoso Enric. "Advanced energy management strategies for HVAC systems in smart buildings". Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/668528.
Pełny tekst źródłaL’eficàcia dels sistemes de gestió d’energia per afrontar el consum d’energia en edificis és un tema que ha rebut un interès en augment durant els darrers anys a causa de la creixent demanda global d’energia i del gran percentatge d’energia que n’utilitzen actualment els edificis. L’escala d’aquest sector ha atret l'atenció de nombrosa investigació amb l’objectiu de descobrir possibles vies de millora i materialitzar-les amb l’ajuda de recents avenços tecnològics que es podrien aprofitar per disminuir les necessitats energètiques dels edificis. Concretament, en l’àrea d’instal·lacions de calefacció, ventilació i climatització, la disponibilitat de grans bases de dades històriques als sistemes de gestió d’edificis fa possible l’estudi de com d'eficients són realment aquests sistemes quan s’encarreguen d'assegurar el confort dels seus ocupants. En realitat, informes recents indiquen que hi ha una diferència entre el rendiment operatiu ideal i el rendiment generalment assolit a la pràctica. En conseqüència, aquesta tesi considera la investigació de noves estratègies de gestió de l’energia per a instal·lacions de calefacció, ventilació i climatització en edificis, destinades a reduir la diferència de rendiment mitjançant l’ús de mètodes basats en dades per tal d'augmentar el seu coneixement contextual, permetent als sistemes de gestió dirigir l’operació cap a zones de treball amb un rendiment superior. Això inclou tant l’avanç de metodologies de modelat capaces d’extreure coneixement de bases de dades de comportaments històrics d’edificis a través de la previsió de càrregues de consum i l’estimació del rendiment operatiu dels equips que recolzin la identificació del context operatiu i de les necessitats energètiques d’un edifici, tant com del desenvolupament d’una estratègia d’optimització multi-objectiu generalitzable per tal de minimitzar el consum d’energia mentre es satisfan aquestes necessitats energètiques. Els resultats experimentals obtinguts a partir de la implementació de les metodologies desenvolupades mostren un potencial important per augmentar l'eficiència energètica dels sistemes de climatització, mentre que són prou genèrics com per permetre el seu ús en diferents instal·lacions i suportant equips diversos. En conclusió, durant aquesta tesi es va desenvolupar, implementar i validar un marc d’anàlisi i actuació complet mitjançant una base de dades experimental adquirida en una planta pilot durant el període d’investigació de la tesi. Els resultats obtinguts demostren l’eficàcia de les contribucions de manera individual i, en conjunt, representen una solució idònia per ajudar a augmentar el rendiment de les instal·lacions de climatització sense afectar el confort dels seus ocupants
Dreijer, Gregor (Gregor Steve). "The evaluation of an ARM-based on-board computer for a low earth orbit satellite". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53112.
Pełny tekst źródłaENGLISH ABSTRACT: The use of commercial-off-the-shelf (COTS) components and emerging technologies in satellite systems has become increasingly popular over the past few years. This is mainly due to advances in radiation shielding and system-level reliability improving techniques. The use of a new generation commercial processor in the design of a satellite's on-board computer (OBC) is now considered a feasible option. The aim of this thesis was to evaluate the use of a commercial grade ARM processor in a low earth orbit (LEO) microsatellite on-board computer. The process began with the selection of the most suitable ARM processor for an aBC design. A typical aBC system was developed for the chosen processor, in order to test its functionality and performance in anOBC design.
AFRIKAANSE OPSOMMING: Die afgelope paar jaar het die gebruik van gewone kommersiële komponente en die nuutste tegnologie in satelliet stelsels heelwat toegeneem. Dit kan grootliks toeskryf word aan die vordering in bestralings afskerming en stelselvlak betroubaarheid tegnieke. Die gebruik van 'n nuwe generasie kommersiële verwerker in die ontwerp van 'n satellite aanboord rekenaar (AR) is nou prakties uitvoerbaar. Die doel van hierdie tesis was om die gebruik van 'n ARM verwerker in 'n lae aardwentelbaan mikrosatelliet aanboord rekenaar te evalueer. Eerstens moes die mees geskikte kommersiële ARM verwerker vir 'n AR ontwerp gevind word. Daarna is 'n tipiese AR stelselontwikkel om die verwerker se funksionaliteit en werkverrigting te toets.
Kesler, Sarita L. "Consolidation and Interweaving of Composite Members by a Continuous Manufacturing Process". BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1292.
Pełny tekst źródłaNarmack, Kirilll. "Dynamic Speed Adaptation for Curves using Machine Learning". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233545.
Pełny tekst źródłaMorgondagens fordon kommer att vara mer sofistikerade, intelligenta och säkra än dagens fordon. Framtiden lutar mot fullständigt autonoma fordon. Detta examensarbete tillhandahåller en datadriven lösning för ett hastighetsanpassningssystem som kan beräkna ett fordons hastighet i kurvor som är lämpligt för förarens körstil, vägens egenskaper och rådande väder. Ett hastighetsanpassningssystem för kurvor har som mål att beräkna en fordonshastighet för kurvor som kan användas i Advanced Driver Assistance Systems (ADAS) eller Autonomous Driving (AD) applikationer. Detta examensarbete utfördes på Volvo Car Corporation. Litteratur kring hastighetsanpassningssystem samt faktorer som påverkar ett fordons hastighet i kurvor studerades. Naturalistisk bilkörningsdata samlades genom att köra bil samt extraherades från Volvos databas och bearbetades. Ett nytt hastighetsanpassningssystem uppfanns, implementerades samt utvärderades. Hastighetsanpassningssystemet visade sig vara kapabelt till att beräkna en lämplig fordonshastighet för förarens körstil under rådande väderförhållanden och vägens egenskaper. Två olika artificiella neuronnätverk samt två matematiska modeller användes för att beräkna fordonets hastighet. Dessa metoder jämfördes och utvärderades.
Michel, Larry Ashley. "A phone application to provide advanced remote control functionality to an embedded systems product". Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-2026.
Pełny tekst źródłatext
Tang, Hao-Yun, i 湯皓雲. "Key Technologies of Realizing Advanced Motion Control Design on CNC Machines through the EtherCAT". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99757796348159553991.
Pełny tekst źródła國立交通大學
電控工程研究所
103
Ethernet Automation Technology EtherCAT (Ethernet for control automation technology) that is established for real-time control applications now is widely adopted in Industrial automation. In this thesis, the packet congestion and data dropout in EtherCAT master ET9200 were analyzed by the packet monitor of Beckoff ET2000. Both the interleaving transmission/receive communication and the missing message estimator are proposed to improve the data loss. On the other hand, ITRI has developed an CNC control interface with the real-time EtherCAT system INtime for master of EtherCAT Internet communication, experimental results that Beckoff ET2000 measure packet transmission time indicate that the sampling time can be set to 0.25ms without data dropout. By implementing the EtherCAT CNC interface on the Tongtai CNC XZ table, all the proportional-derivative (PD) controller, the digital disturbance observer (DDOB), and the cross-coupled controller (CCC) can be realized. Furthermore, both the static nonlinear friction compensator (NFC) and the dynamic nonlinear friction compensator LuGre model were realized on the real-time EtherCAT CNC controller to significantly improve motion precision. Compared with the P Controller, the roundness was improved from 17.8 to 3.8 based on the encoder measurements by applying the proposed integrated controller. Furthermore, its roundness was also significantly reduced from 26.2 to 12.0 from the measurements of double-ball bar.
Vujaklija, Ivan. "Translating Advanced Myocontrol for Upper Limb Prostheses from the Laboratory to Clinics". Doctoral thesis, 2016. http://hdl.handle.net/11858/00-1735-0000-0023-3EF1-F.
Pełny tekst źródłaUddin, S. M. Muslem. "Advanced Model Predictive Control for AC drives with common mode voltage mitigation". Thesis, 2021. http://hdl.handle.net/1959.13/1430649.
Pełny tekst źródłaModel Predictive Control (MPC) is a popular control strategy studied in many research publications. Moreover, its acceptance by industry is slow. This thesis identifies a class of AC application, which can significantly benefit from MPC paradigm. Thus, is high performance AC drives operating in industrial environments where common mode voltage (CMV) is a critical aspect. After critical analysis of the existing MPC-based approaches, the thesis proposes a new and advanced MPC scheme called Feedback Quantization Model Predictive Control (FBQ-MPC). The proposed scheme has a number of important improvements, including integral action, advanced disturbance rejection, improved modulation performance and control over the harmonic spectrum, as well as CMV minimization. Application of the proposed FBQ-MPC method is demonstrated with two selected power converter options found as most appropriate in CMV sensitive environment. Based on the above, full models of industrial AC drive have been developed and studied by simulation and experiment. The studies have shown that AC drives based on FBQ-MPC overcome the common MPC drawback and offer prominent advantages in CMV sensitive, as well as more general, AC drive applications.
(8731800), Xuan Li. "ADVANCED INDOOR THERMAL ENVIRONMENT CONTROL USING OCCUPANT’S MEAN FACIAL SKIN TEMPERATURE AND CLOTHING LEVEL". Thesis, 2020.
Znajdź pełny tekst źródłaPeople spend most of their time indoors. Because people’s health and productivity are highly dependent on the quality of the indoor thermal environment, it is important to provide occupants with healthy, comfortable and productive indoor thermal environment. However, inappropriate thermostat temperature setpoint settings not only wasted large amount of energy but also make occupants less comfortable. This study intended to develop a new control strategy for HVAC systems to adjust the thermostat setpoint automatically and accordingly to provide a more comfortable and satisfactory thermal environment.
This study first trained an image classification model based on CNN to classify occupants’ amount of clothing insulation (clothing level). Because clothing level was related to human thermal comfort, having this information was helpful when determining the temperature setpoint. By using this method, this study performed experimental study to collect comfortable air temperature for different clothing levels. This study collected 450 data points from college student. By using the data points, this study developed an empirical curve which could be used to calculate comfortable air temperature for specific clothing level. The results obtained by using this curve could provide environments that had small average dissatisfaction and average thermal sensation closed to neutral.
To adjust the setpoint temperature according to occupants’ thermal comfort, this study used mean facial skin temperature as an indicator to determine the thermal comfort. Because when human feel hot, their body temperature would rise and vice versa. To determine the correlation, we used a long wave infrared (LWIR) camera to non-invasively obtain occupant’s facial thermal map. By processing the thermal map with Haar-cascade face detection program, occupant’s mean facial skin temperature was calculated. By using this method, this study performed experimental study to collect occupant’s mean facial skin temperature under different thermal environment. This study collected 225 data points from college students. By using the data points, this study discovered different intervals of mean facial skin temperature under different thermal environment.
Lastly, this study used the data collected from previous two investigations and developed a control platform as well as the control logic for a single occupant office to achieve the objective. The measured clothing level using image classification was used to determine the temperature setpoint. According to the measured mean facial skin temperature, the setpoint could be further adjusted automatically to make occupant more comfortable. This study performed 22 test sessions to validate the new control strategy. The results showed 91% of the tested subjects felt neutral in the office