Tesis sobre el tema "Predictive simulation model"
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Shah, Nirali. "Simulation of Model Predictive Control using Dynamic Matrix Control algorithm". Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1604872.
Texto completoModel Predictive Control has emerged as a very powerful technology in the area of process control for three decades. The objective of this work was to develop Dynamic Matrix Control Algorithm, one of the most widely used Model Predictive Control Algorithms using MATLAB and simulate it for a real world Single Input Single Output system. This thesis focuses on the impacts and importance of the tuning parameters of Dynamic Matrix Control along with an overview of the general Model Predictive Control strategy. The tuning of the Dynamic Matrix Controller was done by trial and error based on the knowledge of the simulated system under consideration and the control strategy. The Control Signal computed was then implemented on the system to study its effect on the system output using a discrete transfer function model. The results of the tuned controller were observed to be similar to the other tuning methods discussed in the literature.
Wei, Zhouping, University of Western Sydney y of Mechatronic Computer and Electrical Engineering School. "Model predictive control of a robot using neural networks". THESIS_XXX_MCEE_Wei_Z.xml, 1999. http://handle.uws.edu.au:8081/1959.7/323.
Texto completoMaster of Engineering (Hons)
Riley, Matthew E. "Quantification of Model-Form, Predictive, and Parametric Uncertainties in Simulation-Based Design". Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1314895435.
Texto completoSilva, Marco Jorge Tome da. "Simulation of human motion data using short-horizon model-predictive control". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43041.
Texto completoIncludes bibliographical references (p. 52-56).
Many data-driven animation techniques are capable of producing high quality motions of human characters. Few techniques, however, are capable of generating motions that are consistent with physically simulated environments. Physically simulated characters, in contrast, are automatically consistent with the environment, but their motions are often unnatural because they are difficult to control. We present a model-predictive controller that yields natural motions by guiding simulated humans toward real motion data. During simulation, the predictive component of the controller solves a quadratic program to compute the forces for a short window of time into the future. These forces are then applied by a low-gain proportional-derivative component, which makes minor adjustments until the next planning cycle. The controller is fast enough for interactive systems such as games and training simulations. It requires no precomputation and little manual tuning. The controller is resilient to mismatches between the character dynamics and the input motion, which allows it to track motion capture data even where the real dynamics are not known precisely. The same principled formulation can generate natural walks, runs, and jumps in a number of different physically simulated surroundings.
by Marco da Silva.
S.M.
Toschi, Alessandro. "Integration of Model Predictive Control for autonomous racing". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
Buscar texto completoAbdul-Jalal, Rifqi I. "Engine thermal management with model predictive control". Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/24274.
Texto completoVara-Cadillo, Gabriel. "Autonomous Car Overtake Using Model Predictive Control". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293818.
Texto completoAutonoma fordon har lyckats locka till sig mer populäritet under de senaste åren. En autonom bil har möjligheten att manövrera på ett säkert och effektivt sätt. Detta i kombination med ett fokus att öka vägsäkerheten har lagt större press på att implementera reglersystem för omkörningar. Modell prediktiv reglering (MPC) är användbar för den kan hantera linjära bivillkor och fungerar till autonomon körning. Ett reglersystem är implementerat i Python och testades på sin omkörningförmåga med olika hastigheter, avstånd och begynnelse hastigheter. Implementationen utformades med bivillkor som att det autonoma fordonet inte ska krocka med ett annat fordon eller köra utanför vägen i en omkörning. Resultaten visar att det gick att köra om på ett säkert sätt med vissa förutsättningar. MPC algoritmen har visat sig användbar men svår att optimera.
Kandidatexjobb i elektroteknik 2020, KTH, Stockholm
Sheth, Katha Janak. "Model predictive control for adaptive digital human modeling". Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/884.
Texto completoHorii, M. Michael. "A Predictive Model for Multi-Band Optical Tracking System (MBOTS) Performance". International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579658.
Texto completoIn the wake of sequestration, Test and Evaluation (T&E) groups across the U.S. are quickly learning to make do with less. For Department of Defense ranges and test facility bases in particular, the timing of sequestration could not be worse. Aging optical tracking systems are in dire need of replacement. What's more, the increasingly challenging missions of today require advanced technology, flexibility, and agility to support an ever-widening spectrum of scenarios, including short-range (0 − 5 km) imaging of launch events, long-range (50 km+) imaging of debris fields, directed energy testing, high-speed tracking, and look-down coverage of ground test scenarios, to name just a few. There is a pressing need for optical tracking systems that can be operated on a limited budget with minimal resources, staff, and maintenance, while simultaneously increasing throughput and data quality. Here we present a mathematical error model to predict system performance. We compare model predictions to site-acceptance test results collected from a pair of multi-band optical tracking systems (MBOTS) fielded at White Sands Missile Range. A radar serves as a point of reference to gauge system results. The calibration data and the triangulation solutions obtained during testing provide a characterization of system performance. The results suggest that the optical tracking system error model adequately predicts system performance, thereby supporting pre-mission analysis and conserving scarce resources for innovation and development of robust solutions. Along the way, we illustrate some methods of time-space-position information (TSPI) data analysis, define metrics for assessing system accuracy, and enumerate error sources impacting measurements. We conclude by describing technical challenges ahead and identifying a path forward.
Zsolt, Pap Levente. "Model Predictive Control of Electric Drives -Design, Simulation and Implementation of PMSM Torque Control". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240365.
Texto completoDen här uppsatsen handlar om designen och implementeringen av en motorstyrning för en permanen- magnetiserad synkronmotor, med syfte att ersätta standardmotorstyrningsenheten i KTH Formula Students tävlingsbil. Implementationen av styralgoritmen testades experimentellt tillsammans med en prototyptillverkad frekvensomriktare i labbmiljö. Regleralgoritmer för field oriented control och finite control set model predictive control implementerades och testades i simuleringsmiljö. Den senare algoritmen visade sig prestera bättre i form av lägre vridmomentsoscillationer trots lägre switch-frekvens men den kräver samtidigt mer beräkningskraft. Övertonsinnehållet (THD) i fasströmmarna som funktion av switchfrekvensen undersöktes för de båda regleralgoritmerna, algoritmen för model predictive control gav lägre THD vid lägre frekvenser (1-20 kHz). Simuleringsresultaten användes för att motivera valet av komponenter till frekvensomriktaren. Regleralgoritmen för field oriented control implementerades och testades experimentellt med hjälp av ett utvecklingskort (TMS320F28335) från Texas Instruments. SPI-kommunikation användes för att konfigurera drivkretsana samt för att utläsa felkoder. Experimentalla tester som utfördes på låg spänningsnivå visade att strömmen till lasten var sinusformad. Mätning av verkningsgrad och provning tillsammans med motorn på en högre spänningsnivå gick inte att geno av att de snabba switchförloppen i kiselkarbidtransistorerna störde ut motorstyrningen.
Wei, Zhouping. "Model predictive control of a robot using neural networks". Thesis, View thesis, 1999. http://handle.uws.edu.au:8081/1959.7/323.
Texto completoKhare, Neeraj Prasad. "Predictive Modeling of Metal-Catalyzed Polyolefin Processes". Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11065.
Texto completoPh. D.
Sumer, Yalcin Faik. "Predictive Control of Multibody Systems for the Simulation of Maneuvering Rotorcraft". Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6940.
Texto completoLura, Derek James. "The Creation of a Robotics Based Human Upper Body Model for Predictive Simulation of Prostheses Performance". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4133.
Texto completoCollins, Jack T. "Simulation to reality and back: A robot's guide to crossing the reality gap". Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/230537/1/Jack_Collins_Thesis.pdf.
Texto completoMandokhot, Mohit Atul. "Development of Predictive Gasoline Direct Fuel Injector Model for Improved In-cylinder Combustion Characterization". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534517269503352.
Texto completoSefastsson, Ulf. "Evaluation of Missile Guidance and Autopilot through a 6 DOF Simulation Model". Thesis, KTH, Optimeringslära och systemteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188897.
Texto completoDet har forskats kring styrlagarna och styrautomaterna för robotar sedan an-dra världskrigets. Det finns mycket litteratur på områdena, men merparten av de publicerade resultaten behandlar enbart grovt förenklade modeller, och därför är tillgången på publikationer där metoderna applicerats i en mer realistisk modell begränsat. I denna rapport behandlas en olinjär simuleringsmodell av en jaktrobot som styrs med stjärtfenor och har sex frihetsgrader. Genom en rad antaganden och förenklingar erhålls en linjäriserad modell av missilen, vilket sedan används för implementering av fem styrlagar och två styrautomater. Styr-lagarna är alla baserade på en linjäriserad kollisionsgeometri och styrautomaterna är baserade på modellprediktiv styrning (MPC). Båda styrautomaterna använder linjärkvadratisk MPC, där den ena påstås vara mer robust gentemot modellfel. Styrlagarna och -automaterna utvärderas ur ett prestandaperspektiv med fokus på bomavstånd i fyra realistiska genskjutningsscenarier med ett rörligt mål. Resultaten visar att båda styrautomaterna presterar lika bra, och att de styrlagar med mer information om målets position/hastighet/acceleration generellt presterar bättre, men att de för vissa skjutfall får en väsentligt längre flygtid. Slutsatserna är att förenklingarna och antagandena i linjäriseringen är välgrundade, och att utmaningarna i missilstyrning inte ligger i utformning av styrlag/-automat, utan förmodligen i målsökningen. Därför föreslås det slutligen att framtida arbete bl. a. inkluderar mätbrus och störningar.
Brischetto, Mathias. "Improved Functionality for Driveability During Gear-Shift : A Predictive Model for Boost Pressure Drop". Thesis, Linköpings universitet, Fordonssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123424.
Texto completoDuprey, Benjamin Lawrence Blake. "A New Fuzzy Based Stability Index Using Predictive Vehicle Modeling and GPS Data". Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/32762.
Texto completoThis thesis consists of four main components:
- An overview of GPS technology is presented with coverage of several automotive-based applications. The proposed implementation of GPS in the new Hardware-in-the-Loop (HIL) driving simulator under development at the Virginia Tech Center for Vehicle Systems and Safety (CVeSS) is presented.
- The three degree-of-freedom (3DOF), linear, single track equation set used in the Matlab simulations is derived from first principles.
- Matlab and TruckSim 7® simulations are performed for five vehicle masses and three forward velocities in a ramp-steer maneuver. Using fuzzy logic to develop the control rules for the Total Safety Margin (TSM), TSM matrices are built for both the Matlab and TruckSim 7® results based on these testing conditions. By comparing these TSM matrices it is shown that the two simulation methods yield similar results.
- A discussion of the development and implementation of the aforementioned HIL driving simulator is presented, specifically the steering subsystem. Using Matlab/Simulink, dSPACE ControlDesk, and CarSim RT® software it is shown that the steering module is capable of steering the CarSim RT® simulation vehicle accurately within the physical range of the steering sensor used.
Master of Science
Maran, Fabio. "Model-Based Control Techniques for Automotive Applications". Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423131.
Texto completoNella tesi vengono trattati due argomenti distinti. Model Predictive Control applicato al Motion Cueing Problem Gli ultimi anni hanno visto un'interesse sempre crescente nei confronti dei simulatori di guida dinamici, con lo sviluppo e la diffusione nel mercato di nuovi soluzioni. I simulatori di guida giocano infatti un ruolo fondamentale nello sviluppo di nuovi veicoli e dei vari dispositivi di aiuto alla guida: infatti, da un lato la presenza di un guidatore in un simulatore permette ai produttori in ambito automotive di colmare il divario fra la prototipazione virtuale e i test su strada nella fase di sviluppo del veicolo; dall'altro, i nuovi sistemi di assistenza alla guida (come ad esempio le procedure di advanced accident avoidance attualmente in fase di sviluppo) posso essere testati in totale sicurezza ponendo il pilota in un contesto virtuale altamente realistico, simulando le situazioni di pericolo. In entrambe queste applicazioni risulta cruciale riprodurre fedelmente nella piattaforma la percezione che l'essere umano avrebbe, all'interno del veicolo reale, delle forze agenti sul mezzo e le conseguenti accelerazioni. Questo task deve essere compiuto tenendo conto dei vincoli fisici del simulatore, all'interno dei quali deve avvenire il moto. Le strategie utilizzate per perseguire questo obbiettivo vanno sotto il nome di Motion Cueing Algorithms. Il presente lavoro intende illustrare una particolare implementazione di un Motion Cueing Algorithm, basato sulla tecnica di controllo nota come Model Predictive Control. Una delle principali caratteristiche di questo approccio è lo sfruttamento di un modello del sistema vestibolare umano, e questo (assieme ad altre features) lo rende differente dalle strategie standard di Motion Cueing: esso permette infatti una migliore realizzazione della tilt coordination e una più efficiente gestione dei limiti di piattaforma. L'algoritmo è stato testato sperimentalmente su una piattaforma innovativa, dalle dimensioni ridotte, con l'aiuto di piloti professionisti. I risultati dimostrano come l'algoritmo basato su MPC permetta di gestire efficientemente l'area di lavoro del simulatore, limitando la presenza di tutti quei comportamenti tipicamenti associati alla motion sickness, garantendo nel contempo un approccio molto più semplice e concreto alle procedure di tuning, rispetto alle procedure classiche. In più, la disponibilità di un efficace driver virtuale permette lo sviluppo di strategie predittive affidabili: nella tesi sono riportati alcuni iniziali risultati simulativi in tal senso. Tecniche di Controllo per un Motociclo Ibrido Sportivo La riduzione dell'impatto ambientale dei sistemi di trasporto si sta affermando come una priorità sentita a livello mondiale. I veicoli a propulsione ibrida hanno dimostrato avere un grande potenziale a questo riguardo, e svariate soluzioni sono ormai diffuse sul mercato per quanto riguarda i veicoli a quattro ruote. A differenza delle automobili, e pur essendo considerati la soluzione ideale per la mobilità urbana, l'applicazione della propulsione ibrida a motociclette e scooter non ha ancora avuto una diffusione significativa, e ciò è dovuto in gran parte ai grossi vincoli di spazio e all'impatto della propulsione additiva sul feeling alla guida. In questa parte della tesi viene considerato il problema dell'applicazione della propulsione ibrida a una motocicletta 125cc in commercio, aggiungendo una macchina elettrica al motore termico presente di serie. Lo scopo, per il particolare prototipo, è sfruttare la macchina elettrica (installata in modo solidale all'albero motore) per fornire un incremento alla coppia erogata durante le accelerazioni, migliorando e regolarizzando la potenza della moto e riducendo nel contempo le emissioni di gas nocivi. Due algoritmi di controllo sono proposti per la gestione del motore elettrico e degli accumulatori 1) il primo è basato su una euristica standard con caratteristiche adattative, più semplice da implementare nella ECU per la prototipazione; 2) il secondo è basato su una strategia di controllo ottimo con lo scopo di gestire in maniera ottimale la coppia erogata da entrambi i motori. Elemento cruciale è l'implementazione di un ambiente virtuale Simulink realizzato integrando un tool in commercio, VI-BireRealTime, per la valutazione degli algoritmi. Il modello del motore ibrido è stato implementato ex-novo, e così anche un (semplice) modello di batteria, derivato con interpolazione polinomiale dalle caratteristiche riportate nei data-sheet. Il sistema di simulazione è completato dalla presenza di un virtual rider e di un tool per la realizzazione di circuiti di test. Sono riportati i risultati delle simulazioni su un tracciato realistico per valutare le differenti performance delle due strategie in catena chiusa (grazie al rider virtuale). Sono riportati anche i risultalti su pista del prototipo realizzato.
Michelini, Elisa. "Integration of Energy and Power Predictive Model in Material Flow Simulation: hybrid modelling by using AutoMod ® and Matlab ®". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Buscar texto completoDI, FILIPPO Gabriella. "SUSTAINABLE MOBILITY: SIMULATION OF THE ADOPTION OF FUEL CELL ELECTRIC VEHICLES". Doctoral thesis, Università degli Studi di Palermo, 2022. https://hdl.handle.net/10447/576069.
Texto completoStocca, Valentina. "Development of a predictive LES model for the study of the pollutant dispersion in urban areas". Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3512.
Texto completoIn this thesis, a new large-eddy simulation solver, LES-AIR, has been developed, tested and applied to a practical situation of flow and pollutant dispersion in urban environments. The novelty of the present research resides in the application of a high resolution, accurate, CFD technique to the simulation of real-life flows. The code uses a body fitted curvilinear grid to account for the macro geometry such as terrain slopes, and is thus able to reproduce in detail the complex conditions typical of urban areas; by utilizing the technique of immersed boundaries, the code is also able to mimic the presence the micro complexities such as anthropic structures (i.e. buildings). The first part of the thesis presents a detailed description of the mathematical and numerical model on which the code is based. An extensive set of validation tests was performed in flow configurations having an increasing degree of complexity in terms of forcing and geometry. The numerical model thus validated is applied for obtaining flow and pollutant dispersion in the Servola-Valmaura suburban area of the city of Trieste in Italy. The pollutant was introduced into the domain from a line source near the ground, mimicking the emission from vehicular traffic. In spite of the idealizations inherent to the model, LES-AIR is able to predict the flow and dispersion patterns well, and has proven to be a reliable tool for adaptation in urban pollution studies.
Nella presente tesi è stato sviluppato, testato ed applicato ad un caso studio applicativo un nuovo solutore numerico, chiamato codice LES-AIR, capace di predire i campi di vento e la dispersione di nquinanti in ambienti urbani. La maggiore novità di questo lavoro risiede nell’utilizzo di una tecnica fluidodinamica molto accurata e ad alta risoluzione per la simulazione di flussi reali. Il codice LES-AIR è capace di riprodurre con grande dettaglio le geometrie complesse tipiche delle aree urbane tramite l’utilizzo congiunto di una griglia curvilinea, che si adatta all’ orografia del terreno, e della tecnica dei corpi immersi, con la quale vengono riprodotti gli ostacoli antropici, quali gli edifici. Nella prima parte della tesi viene fornita una descrizione dettagliata del modello matematico e numerico su cui si basa il codice. Il modello è stato validato per mezzo di un esteso set di casi test, aventi un grado crescente di complessit à in termini di forzanti e di configurazione geometriche. Il modello così validato è stato applicato alla riproduzione di un caso applicativo nel quale i campi di vento e la dispersione di un inquinante nella zona di Servola-Valmaura, situata nella periferia di Trieste, sono stati simulati. L’ inquinante è stato introdotto da una sorgente lineare posta in prosimità del terreno e rappresentante l’emissione derivante dal traffico cittadino. Nonostante le condizioni idealizzate di vento considerate, il codice LES-AIR si è dimostrato molto efficace nella predizione del flusso e della dispersione dell’inquinante e quindi si è attestato essere un valido strumento negli studi d’ inquinamento urbani.
XXII Ciclo
1981
Ledet, Jeffrey H. "Simulation and Performance Evaluation of Algorithms for Unmanned Aircraft Conflict Detection and Resolution". ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2168.
Texto completoTian, Guosong. "Network protocols and predictive control strategies for distributed real-time control applications". Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/41545/1/Guosong_Tian_Thesis.pdf.
Texto completoKam, Shui-Cheong. "Assessing of circuit breaker restrike risks using computer simulation and wavelet analysis". Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/53144/1/Shui-Cheong_Kam_Thesis.pdf.
Texto completoWarner, Holly E. "Simulation and Control at the Boundaries Between Humans and Assistive Robots". Cleveland State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=csu1577719990967925.
Texto completoAoun, Nadine. "Modeling and flexible predictive control of buildings space-heating demand in district heating systems". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC104.
Texto completoIn District Heating Systems (DHSs), buildings Space-Heating (SH) demand management conventionally relies on a heating curve: when the outdoor temperature drops, the internal SH system supply water temperature is raised. This control mode, referred to as Weather-Compensation Control (WCC), offers widely recognized assets in terms of simplicity and robustness. However, WCC does not account for the building thermal inertia, and consequently, it does not allow modulation of its demand. SH demand modulation is the control action of strategically altering the indoor thermal comfort conditions within an energetic and/or economic optimization framework. It is a key measure in flexible demand control strategies, which seek loads shifting and peaks shaving to allow sustainable commitment of energy resources in favour of renewable power penetration and waste heat recovery.The work presented in this thesis aims at developing a flexible Model Predictive Control (MPC) strategy for SH demand, applicable at large scale in DHSs.Firstly, a thermal dynamic simulator of a residential building with a radiator SH circuit connected to a DHS substation is developed. It allows the definition of multiple case study buildings, well-representative of the french residential stock, and constitutes the virtual experimental environment for our research. Then, a methodology to obtain a control-oriented Reduced-Order Model (ROM) for the building and its SH system is proposed. It starts by defining the ROM structure based on physical knowledge, and proceeds to parameters identification by meta-heuristic optimization using data generated by the simulator. The parametric identification approach evaluates the possibility of carrying out this task by relying solely on data available at the substation level, refraining from using indoor temperature measurements, personal data assumed to be unavailable at large scale for technical, economic and legal reasons. Finally, MPC is implemented to schedule the SH supply water temperature as function of weather forecasts and energy price variations. The flexible controller is designed to solve a constrained linear optimization problem according to the receding horizon principle. It embeds the linearized ROM equations within the problem formulation and makes an optimal trade-off between energy consumption costs and thermal discomfort, the degree of flexibility to modulate SH demand being defined through dedicated tuning parameters
Cieslar, Dariusz. "Control for transient response of turbocharged engines". Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/244951.
Texto completoVASQUEZ, AGUILAR JENIFER. "Integral sustainability model for the improvement of environmental and productive processes in small and medium enterprises". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2932753.
Texto completoMarques, Thyago Carvalho. "Uma politica operativa a usinas individualizadas para o planejamento da operação energetica do sistema interligado nacional". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261140.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Este trabalho apresenta uma polÃtica para a operação energética do Sistema Nacional (SIN), baseada na representação individualizada das usinas hidrelétricas e termelétricas, na representação detalhada das caracterÃsticas de operação dessas usinas, e na representação indireta da estocasticidade das vazões através demodelo de previsão. Essas caracterÃsticas diferem a polÃtica operativa proposta daquela em vigor no setor elétrico brasileiro, que se baseia na modelagem equivalente de sistemas hidrotérmicos interligados. Diversos estudos de caso são apresentados com o intuito de avaliar o desempenho dessa polÂ'ıtica, desde o caso de sistemas hidrotérmicos simples com uma única usina até o caso completo do SIN sob condições reais. Para esse último caso, um procedimento de ajuste da operação foi implementado para assegurar o atendimento do mercado com as restrições de intercâmbio entre os subsistemas. Análises de sensibilidade foram realizadas em relação a restrições de intercâmbio, inflexibilidade das usinas termelétricas, a importância de algumas usinas hidrelétricas e mercado
Abstract: This work presents an operational policy for the mid term hydrothermal scheduling of the Brazilian Interconnected Power System (BIPS) based on the individual representation of the hydro and thermo power plants, the detailed representation of the plantsâ?¿ features and the indirect representation of the inflow stochasticity through a forecasting model. These characteristics differs the operational policy which is in use nowadays in BIPS, which is based on four interconnected subsystems represented by composite reservoirs. Several case studies are presented to evaluate the performance of the operational policy, from the simple case with a single hydro plant system to the complete case of the whole BIPS under real conditions. For this last case an operational adjustment procedure was implemented to assure the market attendance considering interchange constraints between the subsystems. Sensitivity analyses have been done with respected to interchange, minimum thermal generation, market, importance of hydro plants and system dimension
Doutorado
Energia Eletrica
Doutor em Engenharia Elétrica
Sarmiento, Carnevali Maria Laura. "Modeling and control of PEM fuel cells". Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/667121.
Texto completoA pesar de los avances actuales, la tecnología de celdas de hidrógeno tipo PEM no está suficientemente preparada para ser ampliamente introducida en el mercado energético. Rendimiento, durabilidad y costo son los mayores retos. El rendimiento y la durabilidad de las celdas dependen significativamente de las variaciones en las concentraciones de hidrógeno y oxígeno en los canales de alimentación de gases, la humedad relativa en las capas catalizadoras, el contenido de agua de la membrana polimérica, así como la temperatura, entre otras variables. Dichas variables presentan dependencia espacial interna en la dirección del flujo de gases del ánodo y del cátodo. Distribuciones espaciales altamente no uniformes en algunas variables de la celda resultan en sobrecalentamiento local, inundación, degradación acelerada y menor potencia de la requerida. Muy pocos trabajos disponibles en la literatura se ocupan del control de perfiles espaciales. La mayoría de los diseños orientados a control usan modelos de parámetros concentrados que ignoran la dependencia espacial de variables internas de la celda, debido a la complejidad que añaden al funcionamiento de controladores. En contraste, esta Tesis Doctoral trata la modelización y control de parámetros distribuidos en las celdas de hidrógeno tipo PEM. En la parte de modelización, esta tesis presenta el desarrollo detallado de un modelo no lineal de parámetros distribuidos para una sola celda, el cual incorpora las variaciones espaciales de todas las variables que son relevantes para su correcto funcionamiento. El modelo se usa primero para analizar importantes perfiles espaciales internos, y luego se simplifica para reducir su complejidad computacional y adecuarlo a propósitos de control. En esta tarea se usan y se comparan dos técnicas de reducción de orden de modelos. El propósito de la parte de control es abordar la gestión de agua y el suministro de reactantes, que son dos grandes retos en el funcionamiento de las celdas con importantes consecuencias para su vida útil. En esta parte de la tesis, dos estrategias de control descentralizadas, basadas en controladores predictivos de modelos de referencia con parámetros distribuidos, son diseñadas, implementadas y analizadas en un entorno de simulación. Estas tareas incluyen también el diseño de observadores de estado que estiman los perfiles espaciales internos necesarios para la acción de control. El objetivo de la primera estrategia es monitorear y controlar perfiles espaciales observados de la humedad relativa en las capas catalizadoras para mantenerlos en niveles apropiados. Estos niveles son escogidos cuidadosamente para combinar la correcta humidificación de la membrana y las capas catalizadoras, reduciendo la velocidad de acumulación de agua líquida. El objetivo clave de este enfoque es disminuir la frecuencia de las acciones de remoción de agua dentro de la celda, ya que estas acciones causan interrupción en la potencia suministrada, aumento de las cargas parasitarias y disminución de la eficiencia. La segunda estrategia es una variación de la estrategia anterior que considera adicionalmente el control de la distribución espacial de los gases en los canales del ánodo y cátodo. Esta solución integrada tiene como objetivo evitar la ausencia local de reactantes mediante el control de perfiles espaciales de concentración de gases. Este enfoque pretende prevenir la degradación de las celdas debido a mecanismos de corrosión. Los resultados muestran un mayor rendimiento de la celda considerando los enfoques de control de perfiles espaciales propuestos en esta tesis, en comparación con técnicas de control que ignoran dichos perfiles. Además, la característica descentralizada de los esquemas de control, combinada con el uso de modelos reducidos dentro de los controladores predictivos, tiene un impacto positivo importante en el rendimiento general del control.
Dawoua, Kaoutoing Maxime. "Contributions à la modélisation et la simulation de la coupe des métaux : vers un outil d'aide à la surveillance par apprentissage". Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0013.
Texto completoShaping processes by material removal, also known as machining, are the manufacturing processes most commonly used for the production of mechanical parts, particularly in industrial sectors such as aeronautics, automotive, railways, etc. Although these processes are widely used in industry, the prediction of the characteristic sizes of the machining process is not always accurate, and a poor choice of cutting conditions can lead to abnormal tool wear or even to a deterioration in the quality of the machined part. The fine simulation of machining parameters, aiming at detecting anomalies, is a good example of this problem, as it represents the general problem of optimizing metal cutting to obtain cutting accuracy and anticipate rapid tool wear. This thesis is a contribution to the modelling and simulation of metal cutting, with a view to assisting mechanical parts manufacturing companies in their decision-making, based on knowledge extraction from simulated data. An efficient implementation of an analytical model of orthogonal cutting of metals, able to predict cutting parameters in a reduced time was proposed. The performance of this model was studied by comparing its predictions with the 1045 and carbon steel machining data that are available in the literature. By using the high speed resolution obtained from the proposed implementation, a large quantity of data simulating real cutting conditions was generated, and allowed the elaboration of a machining monitoring approach, based on a deep unsupervised learning method. The implementation with the simulated data highlighted the ability of the proposed detection approach to identify combinations of input parameter values (from the analytical cutting model) that could generate an abnormally high internal temperature; this was considered in the thesis as an indicator of the health of the machining system. Implementation of the proposed learning model gave an accuracy of 99,96 % and a precision of 96%, reflecting its ability to effectively predict the outcome
El-Asrag, Hossam Abd El-Raouf. "Large Eddy Simulation Subgrid Model for Soot Prediction". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14652.
Texto completoIshak, Asnor Muizan. "Hydrological simulation aided by numerical weather prediction model". Thesis, University of Bristol, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.559471.
Texto completoSmit, Jacobus Petrus Johannes. "The quantification of prediction uncertainty associated with water quality models using Monte Carlo Simulation". Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85814.
Texto completoENGLISH ABSTRACT: Water Quality Models are mathematical representations of ecological systems and they play a major role in the planning and management of water resources and aquatic environments. Important decisions concerning capital investment and environmental consequences often rely on the results of Water Quality Models and it is therefore very important that decision makers are aware and understand the uncertainty associated with these models. The focus of this study was on the use of Monte Carlo Simulation for the quantification of prediction uncertainty associated with Water Quality Models. Two types of uncertainty exist: Epistemic Uncertainty and Aleatory Uncertainty. Epistemic uncertainty is a result of a lack of knowledge and aleatory uncertainty is due to the natural variability of an environmental system. It is very important to distinguish between these two types of uncertainty because the analysis of a model’s uncertainty depends on it. Three different configurations of Monte Carlo Simulation in the analysis of uncertainty were discussed and illustrated: Single Phase Monte Carlo Simulation (SPMCS), Two Phase Monte Carlo Simulation (TPMCS) and Parameter Monte Carlo Simulation (PMCS). Each configuration of Monte Carlo Simulation has its own objective in the analysis of a model’s uncertainty and depends on the distinction between the types of uncertainty. As an experiment, a hypothetical river was modelled using the Streeter-Phelps model and synthetic data was generated for the system. The generation of the synthetic data allowed for the experiment to be performed under controlled conditions. The modelling protocol followed in the experiment included two uncertainty analyses. All three types of Monte Carlo Simulations were used in these uncertainty analyses to quantify the model’s prediction uncertainty in fulfilment of their different objectives. The first uncertainty analysis, known as the preliminary uncertainty analysis, was performed to take stock of the model’s situation concerning uncertainty before any effort was made to reduce the model’s prediction uncertainty. The idea behind the preliminary uncertainty analysis was that it would help in further modelling decisions with regards to calibration and parameter estimation experiments. Parameter uncertainty was reduced by the calibration of the model. Once parameter uncertainty was reduced, the second uncertainty analysis, known as the confirmatory uncertainty analysis, was performed to confirm that the uncertainty associated with the model was indeed reduced. The two uncertainty analyses were conducted in exactly the same way. In conclusion to the experiment, it was illustrated how the quantification of the model’s prediction uncertainty aided in the calculation of a Total Maximum Daily Load (TMDL). The Margin of Safety (MOS) included in the TMDL could be determined based on scientific information provided by the uncertainty analysis. The total MOS assigned to the TMDL was -35% of the mean load allocation for the point source. For the sake of simplicity load allocations from non-point sources were disregarded.
AFRIKAANSE OPSOMMING: Watergehalte modelle is wiskundige voorstellings van ekologiese sisteme en speel ’n belangrike rol in die beplanning en bestuur van waterhulpbronne en wateromgewings. Belangrike besluite rakende finansiële beleggings en besluite rakende die omgewing maak dikwels staat op die resultate van watergehalte modelle. Dit is dus baie belangrik dat besluitnemers bewus is van die onsekerhede verbonde met die modelle en dit verstaan. Die fokus van hierdie studie het berus op die gebruik van die Monte Carlo Simulasie om die voorspellingsonsekerhede van watergehalte modelle te kwantifiseer. Twee tipes onsekerhede bestaan: Epistemologiese onsekerheid en toeval afhangende onsekerheid. Epistemologiese onsekerheid is die oorsaak van ‘n gebrek aan kennis terwyl toeval afhangende onsekerheid die natuurlike wisselvalligheid in ’n natuurlike omgewing behels. Dit is belangrik om te onderskei tussen hierdie twee tipes onsekerhede aangesien die analise van ’n model se onsekerheid hiervan afhang. Drie verskillende rangskikkings van Monte Carlo Simulasies in die analise van die onsekerhede word bespreek en geïllustreer: Enkel Fase Monte Carlo Simulasie (SPMCS), Dubbel Fase Monte Carlo Simulasie (TPMCS) en Parameter Monte Carlo Simulasie (PMCS). Elke rangskikking van Monte Carlo Simulasie het sy eie doelwit in die analise van ’n model se onsekerheid en hang af van die onderskeiding tussen die twee tipes onsekerhede. As eksperiment is ’n hipotetiese rivier gemodelleer deur gebruik te maak van die Streeter-Phelps teorie en sintetiese data is vir die rivier gegenereer. Die sintetiese data het gesorg dat die eksperiment onder beheerde toestande kon plaasvind. Die protokol in die eksperiment het twee onsekerheids analises ingesluit. Al drie die rangskikkings van die Monte Carlo Simulasie is gebruik in hierdie analises om die voorspellingsonsekerheid van die model te kwantifiseer en hul doelwitte te bereik. Die eerste analise, die voorlopige onsekerheidsanalise, is uitgevoer om die model se situasie met betrekking tot die onsekerheid op te som voor enige stappe geneem is om die model se voorspellings onsekerheid te probeer verminder. Die idee agter die voorlopige onsekerheidsanalise was dat dit sou help in verdere modelleringsbesluite ten opsigte van kalibrasie en die skatting van parameters. Onsekerhede binne die parameters is verminder deur die model te kalibreer, waarna die tweede onsekerheidsanalise uitgevoer is. Hierdie analise word die bevestigingsonsekerheidsanalise genoem en word uitgevoer met die doel om vas te stel of die onsekerheid geassosieer met die model wel verminder is. Die twee tipes analises word op presies dieselfde manier toegepas. In die afloop tot die eksperiment, is gewys hoe die resultate van ’n onsekerheidsanalise gebruik is in die berekening van ’n totale maksimum daaglikse belading (TMDL) vir die rivier. Die veiligheidgrens (MOS) ingesluit in die TMDL kon vasgestel word deur die gebruik van wetenskaplike kennis wat voorsien is deur die onsekerheidsanalise. Die MOS het bestaan uit -35% van die gemiddelde toegekende lading vir puntbelasting van besoedeling in die rivier. Om die eksperiment eenvoudig te hou is verspreide laste van besoedeling nie gemodelleer nie.
Echavarria, Gregory Maria Angelica. "Predictive Data-Derived Bayesian Statistic-Transport Model and Simulator of Sunken Oil Mass". Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/471.
Texto completoGillett, A. G. "Modelling the response of winter wheat to different environments : a parsimonious approach". Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339658.
Texto completoKenimer, Ann Lee. "A computer simulation model for predicting pesticide losses from agricultural lands". Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45817.
Texto completoA field scale model for predicting the surface losses of pesticides (Pesticide Losses In Erosion and Runoff Simulator, PLIERS) was developed. PLIERS accounts for pesticide losses by degradation and volatilization, the washoff of pesticides from plant canopy and surface residue, the adsorption and desorption of pesticides to and from soil particles, and the movement of pesticides in the dissolved and adsorbed phases. Hydrologic data are generated by the comprehensive watershed model, FESHM; which contains an extended sediment detachment and transport algorithrn. PLIERS uses first order rate equations to describe degradation and volatilization, and pesticide washoff. The adsorption of pesticides to individual particle size classes is estimated using the Freundlich equation.
Movement of atrazine and 2,4-D in runoff and sediment was measured on twelve field plots under simulated rainfall. The plots were treated with conventional or no-tillage in combination with one of three residue levels (0, 750, and 1500 kg/ha). Runoff and sediment losses were found to increase with decreasing residue cover for both tillage systems. No·till reduced sediment loss and total runoff volume by 98 and 92 percent, respectively, compared to conventional tillage. Concentrations of atrazine and 2,4-D ir1 runoff and sediment were greater from the no-till plots than from the conventional plots but the total losses were less. Both pesticides were carried predominately in the dissolved phase. Averaged over all plots, the atrazine losses were 2.9 percent of applied amount for conventional tillage and 0.3 percent for no-tillage. The corresponding values for 2,4-D were 0.3 percent and 0.02 percent.
PLIERS was validated using data from the rainfall simulator field plot studies. Agreement between predicted and observed data was very good for dissolved pesticide losses and satisfactory for adsorbed pesticide losses. In addition, the effects of tillage type and residue level were reflected in PLIERS predictions. PLIERS shows great potential as a flexible planning tool since it could be used with any comprehensive hydrologic model and is able to predict the losses of pesticides under various field conditions.
Master of Science
Walker, Jens. "A motion cueing model for mining and forestry simulator platforms based on Model Predictive Control". Thesis, Umeå universitet, Institutionen för fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-98685.
Texto completoOryx Simulations tillverkar simulatorer i huvudsak för gruv- och skogsindustrinvilket används i utbildnings- och marknadsföringssyfte. Simulatorerna använder en röorelseplattform för att spegla hur fordonet i simulatormiljön rör sig. Denna plattform lutar och accelererar föraren för att förstarka upplevelsen. Tidigare har ett så kallat klassiskt washout-filter använts för att kontrollera plattformen som lämnar en del i övrigt att onska vad gäller hur väl fordonets rörelser speglas, hur lätt det ar att justera samt hur det hanterar plattformens begränsningar. Detta projekt ämnar producera en modell som väl speglar vinklar,hastigheter och accelerationer samtidigt som den respekterar plattformens gränser. I tillägg till detta bör modellen vara enkel att modifiera och justera. Detta uppnås genom så kallad Model Predictive Control som förutsager hur plattformen kommer röra sig utifrån dess aktuella tillstånd samtidigt som den respekterar de tvång som finns på plattformen direkt i modellen. Då alla parametrar i modellen är faktiska fysiska kvantiteter blir modellen märkbart lättare att justera. En viktig komponent i denna lösning är så kallad tilt coordination vilket består i att substituera lateral/longtudinell acceleration med en komposant av tyngdaccelerationen genom att luta föraren. Denna modell konstrueras och implementeras i Matlab och verifieras genom att använda extraherat data från den simulerade miljön. Vi kan se att parametrarna som består av vinklar, rotationella hastigheter och linjära accelerationer speglas väldigt väl, samtidigt som tvången på plattformen respekteras. Dessa tvång kan enkelt modieras for att passa den aktuella simulatorn. Vi ser även att modellen framgångsrikt implementerar tilt coordination i plattformens beteende. I teorin har denna modell väldigt bra prestanda; vad som kvarstår är att implementera den på en rörelseplattform och finjustera modellen.
Shi, Han. "Numerical simulations and predictive models of undrained penetration in soft soils". Texas A&M University, 2005. http://hdl.handle.net/1969.1/2555.
Texto completoFuenzalida, González Octavio Francisco. "Model predictive control of froth flotation processes aided by a dynamic simulator". Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/150812.
Texto completoA model and simulation based methodology is used to implement a multi-layer model predictive control (MPC) strategy for a rougher row of mechanical flotation cells. Pilot-scale tests are done to calibrate and validate both the process simulation models and the predictive simulation models. The hierarchical control strategy considers three layers: orchestrator, advanced control and basic control; is deployed, in a commercial control system and, tested in a pilot row. The orchestrator is divided in two: the row supervisor and the row optimizer. The row supervisor monitors and manages all the other components of the control structure. The optimizer is a MPC-based controller which optimal criterion is separation efficiency (SE) and; according to recent developments, that happens with a balanced mass-pull profile along the row. The advanced control layer includes individual cell MPC in coordination with a symbolic MPC for all pulp levels along the row. The basic control layer consists of single loop proportional and integral (PI) controllers and their corresponding valves and instruments. After simulation, the control layers are successively downloaded in an industrial controller, starting from the basic control layer and ending with orchestrator s algorithms. Then, the control structure provides good disturbance rejection against feed variabilities. Regarding the orchestrator, it supports smooth and logical transitions between control modes as well as good abnormal situation management. This work shows promising results of the power of integrated process control design and model based methodologies; allowing earlier and better selection and validation of: flotation machine technology, cutting edge instrumentation and, advanced control structure and strategies. Given pre-defined economic assumptions, estimated results are obtained for the simulated industrial scenario: almost 40 percent reduction of capital expenditure (Capex), with almost the same operational expenditure (Opex). From the total Capex reduction, almost 80% is due to integrated process and control design (IPCD), being the other 20% a consequence of advanced process control and optimization structure and strategies. MPC-based control algorithms show their potential to have a main role in mineral processing processes feasibility and optimality.
Stockdale, Timothy N. "Simulation and prediction of tropical SST with a coupled ocean-atmosphere model". Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305416.
Texto completoStenberg, Patric. "Computational models for the prediction of intestinal membrane permeability". Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-4934-4/.
Texto completoHoogendoorn, Corné. "A statistical dynamic cardiac atlas for the virtual physiological human: construction and application". Doctoral thesis, Universitat Pompeu Fabra, 2014. http://hdl.handle.net/10803/132632.
Texto completoEsta tesis está centrada en la construcción de un atlas cardiaco, para servir como marco común de referencia en el Virtual Physiological Human (VPH). La construcción consiste en la trayectoria completa, empezando con un conjunto de imágenes 3D+t de tomografía computacional multi-corte, y entonces hacer una normalización espacial de las imágenes, segmentación de la imagen promedio sintetizada, un mallado multi-estructura, y finalmente la transformación de la malla a la población de imágenes. Adicionalmente, la tesis presenta dos aplicaciones del atlas. Primero, el atlas se usa para enmarcar un modelo espacio-temporal de la morfología cardiaca que modela la variación a lo largo de ambos 'ejes' simultáneamente. Tal propuesta debe ser preferible sobre otros m\'etodos existentes, los cuales desacoplan las dos fuentes de variación para modelarlas separadamente, en isolación. Segundo, el atlas está aplicado al desarrollo de una técnica de aceleración para simulaciones personalizadas de electrofisiología (EF) cardiaca. El conocimiento previo encapsulado en nuestro atlas se usa, en conjunto con un solver de EF cardiaca, para construir un modelo estadístico conectando morfología cardiaca con los steady states de modelos celulares del miocardio que precondicionan a simulaciones detalladas de EF cardiaca. Esta aplicación posiciona el propuesto atlas dinámico cardiaco en el contexto de simulaciones relacionadas al VPH, cuyo costo computacional actual está en gran exceso de lo aceptable para su adopción en la práctica clínica de hoy en día.
Lancaster, Joseph Paul Jr. "Predicting the behavior of robotic swarms in discrete simulation". Diss., Kansas State University, 2015. http://hdl.handle.net/2097/18980.
Texto completoDepartment of Computing and Information Sciences
David Gustafson
We use probabilistic graphs to predict the location of swarms over 100 steps in simulations in grid worlds. One graph can be used to make predictions for worlds of different dimensions. The worlds are constructed from a single 5x5 square pattern, each square of which may be either unoccupied or occupied by an obstacle or a target. Simulated robots move through the worlds avoiding the obstacles and tagging the targets. The interactions between the robots and the robots and the environment lead to behavior that, even in deterministic simulations, can be difficult to anticipate. The graphs capture the local rate and direction of swarm movement through the pattern. The graphs are used to create a transition matrix, which along with an occupancy matrix, can be used to predict the occupancy in the patterns in the 100 steps using 100 matrix multiplications. In the future, the graphs could be used to predict the movement of physical swarms though patterned environments such as city blocks in applications such as disaster response search and rescue. The predictions could assist in the design and deployment of such swarms and help rule out undesirable behavior.
Göktepe, Serdar. "Micro-macro approaches to rubbery and glassy polymers : predictive micromechanically-based models and simulations". Stuttgart Institut für Mechanik (Bauwesen) der Universität Stuttgart, 2007. http://elib.uni-stuttgart.de/opus/volltexte/2007/3342/.
Texto completoTang, Youmin. "ENSO simulation and prediction using hybrid coupled models with data assimilation". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ61182.pdf.
Texto completoRastogi, Mayank Carleton University Dissertation Engineering Civil. "Development of simulation models for predicting heavy vehicle performance on grade". Ottawa, 1989.
Buscar texto completoDavies, Graham Mark. "Molecular simulation of adsorption equilibrium in microporous solids : model development and performance prediction". Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624341.
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