Дисертації з теми "Optimization-simulation modelling"
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Ibrahim, Rashidi. "Vibration assisted machining : modelling, simulation, optimization, control and applications." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4732.
Повний текст джерелаSun, Yan. "Modelling, simulation and optimization of near-ambient grain drying." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243324.
Повний текст джерелаSiurana, Paula Maria. "Modelling and multiobjective optimization for simulation of cyanobacterial metabolism." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/90578.
Повний текст джерелаLa presente tesis está dedicada al desarrollo de modelos y algoritmos para mejorar las simulaciones metabólicas de cianobacterias. Las cianobacterias son bacterias fotosintéticas de gran interés biotecnológico para el desarrollo de bioprocesos productivos sostenibles. Para este propósito, es fundamental entender el comportamiento metabólico de estos organismos, y el modelado metabólico basado en restricciones ofrece una plataforma para el análisis y la evaluación de las funcionalidades metabólicas de las células. Se necesitan simulaciones fidedignas para aumentar la aplicabilidad de los resultados, y este es el objetivo principal de esta tesis. Esta disertación se ha estructurado en tres partes. La primera parte está dedicada a introducir los fundamentos necesarios de las disciplinas que se combinan en este trabajo: el modelado metabólico, el metabolismo de cianobacterias, y la optimización multiobjetivo. En la segunda parte, se encara la reconstrucción y la actualización de los modelos metabólicos de dos cepas de cianobacterias. Estos modelos se usan después para llevar a cabo simulaciones metabólicas con la aplicación de la metodología clásica Flux Balance Analysis (FBA). Los estudios realizados en esta parte son útiles para ilustrar los usos y aplicaciones de las simulaciones metabólicas para el análisis de los organismos vivos. Y al mismo tiempo sirven para identificar importantes limitaciones de las técnicas clásicas de simulación basadas en optimización lineal mono-objetivo que motivan la búsqueda de nuevas estrategias. Finalmente, en la tercera parte, se define una nueva aproximación basada en la aplicación al modelado metabólico de procedimientos de optimización multiobjetivo. Se cubren los principales pasos en la definición de un problema multiobjetivo y la descripción de un algoritmo de optimización que aseguren la aplicabilidad de los resultados obtenidos, así como el análisis multi-criterio de las soluciones. La herramienta resultante permite la definición de funciones objetivo y restricciones no lineales, así como el análisis de múltiples soluciones en el sentido de Pareto. Esta herramienta evita algunos de los principales inconvenientes de las metodologías clásicas, lo que lleva a obtener simulaciones más flexibles y resultados más realistas. En conjunto, esta tesis contribuye al avance en el estudio del metabolismo de cianobacterias por medio de la definición de modelos y estrategias que mejoran la plasticidad y las capacidades predictivas de las simulaciones metabólicas.
La present tesi està dedicada al desenvolupament de models i algorismes per a millorar les simulacions metabòliques de cianobacteris. Els cianobacteris són bacteris fotosintètics de gran interés biotecnològic per al desenvolupament de bioprocessos productius sostenibles. Per a aquest propòsit, és fonamental entendre el comportament metabòlic d'aquests organismes, i el modelatge metabòlic basat en restriccions ofereix una plataforma per a l'anàlisi i l'avaluació de les funcionalitats metabòliques de les cèl·lules. Es necessiten simulacions fidedignes per a augmentar l'aplicabilitat dels resultats, i aquest és l'objectiu principal d'aquesta tesi. Aquesta dissertació s'ha estructurat en tres parts. La primera part està dedicada a introduir els fonaments necessaris de les disciplines que es combinen en aquest treball: el modelatge metabòlic, el metabolisme de cianobacteris i l'optimització multiobjectiu. En la segona part, s'adreça la reconstrucció i l'actualització dels models metabòlics de dos soques de cianobacteris. Aquests models s'empren després per a portar a terme simulacions metabòliques amb l'aplicació de la metodologia clàssica Flux Balance Analysis (FBA). Els estudis realitzats en aquesta part són útils per a il·lustrar els usos i aplicacions de les simulacions metabòliques per a l'anàlisi dels organismes vius. I al mateix temps serveixen per a identificar importants limitacions de les tècniques clàssiques de simulació basades en optimització lineal mono-objectiu que motiven la cerca de noves estratègies. Finalment, en la tercera part, es defineix una nova aproximació basada en l'aplicació al modelatge metabòlic de procediments d'optimització multiobjectiu. Es cobreixen els principals passos en la definició d'un problema multiobjectiu i la descripció d'un algorisme d'optimització que asseguren l'aplicabilitat dels resultats obtinguts, així com l'anàlisi multi-criteri de les solucions. La ferramenta resultant permet la definició de funcions objectiu i restriccions no lineals, així com l'anàlisi de múltiples solucions òptimes en el sentit de Pareto. Aquesta ferramenta evita alguns dels principals inconvenients de les metodologies clàssiques, el que porta a obtenir simulacions més flexibles i resultats més realistes. En conjunt, aquesta tesi contribueix a l'avanç en l'estudi del metabolisme de cianobacteris per mitjà de la definició de models i estratègies que milloren la plasticitat i les capacitats predictives de les simulacions metabòliques.
Siurana Paula, M. (2017). Modelling and multiobjective optimization for simulation of cyanobacterial metabolism [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/90578
TESIS
Ashaibani, A. S. "Modelling simulation and optimization of refinery processess with energy conservation." Thesis, University of Bradford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511389.
Повний текст джерелаAris, Najmil Faiz Mohamed. "Surfaces functionality of precision machined components : modelling, simulation, optimization and control." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5092.
Повний текст джерелаScaglioso, Giovanni. "Modelling, simulation and optimization of maintenance considerations on condition based maintenance." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8308/.
Повний текст джерелаAchermann, David. "Modelling, simulation and optimization of maintenance strategies under consideration of logistic processes /." Zürich : ETH, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000259627.
Повний текст джерелаPang, Xi. "Trade-off analysis of forest ecosystem services – A modelling approach." Doctoral thesis, KTH, Hållbarhet, utvärdering och styrning, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-216432.
Повний текст джерелаQC 20171023
Dritsas, Ioannis. "Stochastic modelling and simulation-based optimization of specialty fibres for high power fibre lasers." Thesis, City University London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446447.
Повний текст джерелаVasini, Ester Maria <1986>. "Numerical Modelling and Simulation Optimization of Geothermal Reservoirs Using the Tough2 Family of Codes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7412/1/Vasini_EsterMaria_tesi.pdf.
Повний текст джерелаVasini, Ester Maria <1986>. "Numerical Modelling and Simulation Optimization of Geothermal Reservoirs Using the Tough2 Family of Codes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7412/.
Повний текст джерелаProkop, Aleš. "Optimalizace procesů výrobní linky." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2008. http://www.nusl.cz/ntk/nusl-221747.
Повний текст джерелаFang, Yiping. "Critical infrastructure protection by advanced modelling, simulation and optimization for cascading failure mitigation and resilience." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0013/document.
Повний текст джерелаContinuously increasing complexity and interconnectedness of modern critical infrastructures, together with increasingly complex risk environments, pose unique challenges for their secure, reliable, and efficient operation. The focus of the present dissertation is on the modelling, simulation and optimization of critical infrastructures (CIs) (e.g., power transmission networks) with respect to their vulnerability and resilience to cascading failures. This study approaches the problem by firstly modelling CIs at a fundamental level, by focusing on network topology and physical flow patterns within the CIs. A hierarchical network modelling technique is introduced for the management of system complexity. Within these modelling frameworks, advanced optimization techniques (e.g., non-dominated sorting binary differential evolution (NSBDE) algorithm) are utilized to maximize both the robustness and resilience (recovery capacity) of CIs against cascading failures. Specifically, the first problem is taken from a holistic system design perspective, i.e. some system properties, such as its topology and link capacities, are redesigned in an optimal way in order to enhance system’s capacity of resisting to systemic failures. Both topological and physical cascading failure models are applied and their corresponding results are compared. With respect to the second problem, a novel framework is proposed for optimally selecting proper recovery actions in order to maximize the capacity of the CI network of recovery from a disruptive event. A heuristic, computationally cheap optimization algorithm is proposed for the solution of the problem, by integrating foundemental concepts from network flows and project scheduling. Examples of analysis are carried out by referring to several realistic CI systems
Persson, Marie. "Modelling and Analysing Hospital Surgery Operations Management." Licentiate thesis, Karlskrona : Department of Systems and Software Engineering, Blekinge Institute of Technology, 2007. http://www.bth.se/fou/Forskinfo.nsf/allfirst2/020017aaa5cc3a0fc125734d0034ad77?OpenDocument.
Повний текст джерелаDiaz, Leiva Juan Esteban. "Simulation-based optimization for production planning : integrating meta-heuristics, simulation and exact techniques to address the uncertainty and complexity of manufacturing systems." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/simulationbased-optimization-for-production-planning-integrating-metaheuristics-simulation-and-exact-techniques-to-address-the-uncertainty-and-complexity-of-manufacturing-systems(9ef8cb33-99ba-4eb7-aa06-67c9271a50d0).html.
Повний текст джерелаLiang, Wen. "Integrated feature, neighbourhood, and model optimization for personalised modelling and knowledge discovery." Click here to access this resource online, 2009. http://hdl.handle.net/10292/749.
Повний текст джерелаGokan, Khan Michel. "Performance Modelling and Simulation of Service Chains for Telecom Clouds." Licentiate thesis, Karlstads universitet, Institutionen för matematik och datavetenskap (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-83687.
Повний текст джерелаSudiro, Maria. "Alternative processes for the production of biofuels and synthetic fuels: development, simulation and optimization." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425637.
Повний текст джерелаIl progetto di ricerca di questa tesi di dottorato ha riguardato lo sviluppo di processi alternativi per la produzione di biocarburanti e carburanti di sintesi. Il lavoro svolto è stato prevalentemente di modellazione, simulazione e ottimizzazione di processo, a cui si è aggiunta una parte sperimentale sulla produzione di bioetanolo. Per quanto riguarda quest’ultima, si è costruita un’apparecchiatura per misurare le cinetiche di fermentazione alcolica sotto pressione di CO2, e si sono ottenuti risultati interessanti a diverse condizioni di lavoro. Anche una parte del lavoro di simulazione ha riguardato il bioetanolo, di cui è stato ottimizzato un processo di produzione di prima generazione. Poi l’interesse si è focalizzato sullo sviluppo e sulla modellazione di processi alternativi per la produzione di combustibili sintetici da carbone (Coal to Liquid o CTL). Si sono messe a punto soluzioni innovative ai processi esistenti soprattutto per la sezione di gassificazione. Sono state proposte e verificate mediante simulazione due idee per realizzare la gassificazione del carbone con aria, senza diluire il gas di sintesi prodotto. Per ogni processo considerato l’analisi è iniziata con lo studio termodinamico per poi includere anche gli aspetti cinetici e di trasporto di materia. Si sono valutate le prestazioni dei processi proposti, con riferimento all’efficienza energetica e all’impatto ambientale (emissioni di CO2), ottenendo risultati decisamente migliorativi rispetto alle tecnologie esistenti. Si è abbozzata infine un’analisi economico-finanziaria.
Talbot, Edith. "Manufacturing process modelling of thermoplastic composite resistance welding." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83934.
Повний текст джерелаGrossi, Matteo. "Dynamic design, optimization and simulation of a control strategy for a pharmaceutical bioprocess." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17906/.
Повний текст джерелаWeiß, Ursula [Verfasser], and Malte A. [Akademischer Betreuer] Peter. "Modelling and simulation of electromagnetic source mechanisms and sensor optimization via homogenization / Ursula Weiß ; Betreuer: Malte A. Peter." Augsburg : Universität Augsburg, 2021. http://d-nb.info/1228787948/34.
Повний текст джерелаCAMPIONE, Antonino. "Electrodialysis modelling for low energy desalination." Doctoral thesis, Università degli Studi di Palermo, 2020. http://hdl.handle.net/10447/395212.
Повний текст джерелаRybicki, Martin Rafael [Verfasser], and Ingenuin [Akademischer Betreuer] Gasser. "Mathematical Modelling, Simulation and Optimization of Gas Dynamics in a Car’s Exhaust Pipe / Martin Rafael Rybicki. Betreuer: Ingenuin Gasser." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2014. http://d-nb.info/1055069879/34.
Повний текст джерелаRybicki, Martin [Verfasser], and Ingenuin [Akademischer Betreuer] Gasser. "Mathematical Modelling, Simulation and Optimization of Gas Dynamics in a Car’s Exhaust Pipe / Martin Rafael Rybicki. Betreuer: Ingenuin Gasser." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2014. http://d-nb.info/1055069879/34.
Повний текст джерелаAbebe, Birhanu Tamene [Verfasser], and Christoph [Gutachter] Pflaum. "Modelling, Simulation and Optimization of Thin Film Silicon Solar Cells on Flexible Aluminium Substrate / Birhanu Tamene Abebe ; Gutachter: Christoph Pflaum." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1138837563/34.
Повний текст джерелаCIRILLO, GIOVANNI AMEDEO. "Engineering quantum computing technologies: from compact modelling to applications." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2971119.
Повний текст джерелаAyele, Getnet Tadesse. "Exploiting the synergies from coupled electricity and heat distribution networks : modelling, simulation and optimization based on an extended energy hub approach." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2020. http://www.theses.fr/2020IMTA0215.
Повний текст джерелаRecent literature shows that there is a significant potential of decarbonisation and efficiency improvement that can be achieved through the synergy from multi-energy systems (MESs). Coupling technologies, such as co-generation plants, heat pumps and thermal storages are widely recommended as means of unlocking additional flexibility and increasing the penetration of renewables in the heating and electricity sectors. In view of that, the size and number of coupling technologies, such as combined heat and power plants and heat pumps (HPs), being installed in the heat distribution networks are increasing. As these technologies are exclusively managed by the district heating network operators, their operation sometimes becomes suboptimal from the electricity network point of view, and they (in particular large HPs) may cause overloading of the low voltage electricity distribution networks. Integrated simulation and optimisation models are required to exploit the synergies effectively without compromising the constituent distribution networks of MES. Such models are not yet well developed. The conventional single-energy-carrier simulation tools are not capable of capturing key operating parameters of the multi-carrier distribution networks either. A novel methodology for simulation and optimisation of MES is developed in this thesis based on an Extended Energy Hub (EEH) approach. The general framework is first developed in modular form so that it can be easily adapted for any type of multi-carrier energy networks. The framework is then used to develop the details of an integrated load flow model governing coupled heating and electricity distribution networks. Various load flow case studies with radial and meshed topologies are considered for demonstration and numerical validation of the proposed model. The load flow model is further combined with a particle swarm optimisation algorithm in order to conduct integrated optimal power flow studies. Its contribution to the state of art is demonstrated by studying the optimal placement of coupling technologies, such as HPs and boilers in coupled heating and electricity distribution networks. The capacity of the model is further illustrated by exploiting the synergies using HPs together with thermal storage in the presence of intermittent renewables and variable electricity price signal. It is shown that the EEH-based simulation and optimisation methodologies proposed in this thesis are very effective, flexible and easily scalable in capturing the key operating parameters of integrated electricity and district heating networks. The models can be used as a platform for further studies on integration of smart grids and smart thermal networks
Erlendsson, Örn. "Daylight Optimization - A Parametric Study of Atrium Design : Early Stage Design Guidelines of Atria for Optimization of Daylight Autonomy." Thesis, KTH, Installations- och energisystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146292.
Повний текст джерелаNordström, Erik. "Advanced Modelling and Energy Efficiency Prediction for Road Vehicles." Thesis, Umeå universitet, Institutionen för fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-175358.
Повний текст джерелаVelasco, Carrau Jesús. "Unmanned Aerial Vehicles Modelling and Control Design. A Multi-Objective Optimization Approach." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/156034.
Повний текст джерела[CA] Esta tesis presenta los resultados del trabajo de investigación llevado a cabo sobre el modelado y el diseño de controladores para micro-aeronaves no tripuladas mediante técnicas de optimización multi-objetivo. Dos principales campos de estudio están presentes a lo largo de ella. Por un lado, el estudio de cómo modelar y controlar plataformas aéreas de pequeña envergadura. Y, por otro, el estudio sobre el empleo de técnicas heurísticas de optimización multi-objetivo para aplicar en el proceso de parametrización de modelos y controladores en micro-aeronaves no tripuladas. Se obtienen como resultado principal una serie de herramientas que permiten prescindir de experimentos en túneles de viento o de sensórica de alto coste, pasando directamente a la utilización de datos de vuelo experimental en la identificación paramétrica de modelos dinámicos. Además, se demuestra como la utilización de herramientas de optimización multi-objetivo en diferentes fases del desarrollo de controladores ayuda a aumentar el conocimiento sobre la plataforma a controlar y aumenta la fiabilidad y robustez de los controladores desarrollados, disminuyendo el riesgo de pasar de las fases previas del diseño a la validación en vuelo real.
[EN] This thesis presents the results of the research work carried out on the modelling and design of controllers for micro-unmanned aerial vehicles by means of multi-objective optimization techniques. Two main fields of study are present throughout it. On one hand, the study of how to model and control small aerial platforms. And, on the other, the study on the use of heuristic multi-objective optimization techniques to apply in the process of models and controllers parameterization in micro-unmanned aerial vehicles. The main result is a series of tools that make it possible manage without wind tunnel experiments or high-cost air-data sensors, going directly to the use of experimental flight data in the parametric identification of dynamic models. In addition, a demonstration is given on how the use of multi-objective optimization tools in different phases of controller development helps to increase knowledge about the platform to be controlled and increases the reliability and robustness of the controllers developed, reducing the risk of hoping from the initial design phases to validation in real flight.
Velasco Carrau, J. (2020). Unmanned Aerial Vehicles Modelling and Control Design. A Multi-Objective Optimization Approach [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/156034
TESIS
Wikedzi, Alphonce Wendelin. "Optimization and performance of grinding circuits: the case of Buzwagi Gold Mine (BGM)." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-235098.
Повний текст джерелаAradi, Thabiani Cristine. "Planejamento de operações de manutenção submarina." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-07032016-115426/.
Повний текст джерелаThis research aimed at solving the problem of planning underwater operations that involves job scheduling and fleet sizing decisions. The problem consisted in establish the best sequence of tasks to be atended by vessels taking into account compatibility constraints, sequencing rules and the size of the fleet. The problem is an extension of the classical vehicle routing problem with time windows. The objective is to minimize the routing costs and the economic losses associated with production losses. The solution procedure focused on short and long-term decisions based on the heuristic Simulated Anneling through a simulation-optimization algorithm.
Qi, Rui. "Optimization and optimal control of plant growth : application of GreenLab model for decision aid in agriculture." Phd thesis, Châtenay-Malabry, Ecole centrale de Paris, 2010. http://tel.archives-ouvertes.fr/tel-00494918.
Повний текст джерелаHussain, Mohammed Salih. "Numerical simulation and effective management of saltwater intrusion in coastal aquifers." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/19239.
Повний текст джерелаTouš, Michal. "Výpočtový systém pro výběr optimálního způsobu využití energie generované spalovacími procesy." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-234148.
Повний текст джерелаCastelan, Anne. "Modélisation de composants d'extraction de la chaleur : application à l'optimisation de système d'électronique de puissance." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30341/document.
Повний текст джерелаThe replacement of hydraulic and pneumatic network embedded in aircraft by electrical network will increase the number of embedded systems to ensure the effective functioning of the aircraft. The development of an electrical aircraft will allow the reduction of production and functioning costs. It will also help ensure a better reliability of systems and will reduce the ecological impact of the aircraft circulation. This kind of plane would be lighter than a usual one. To be sure of this, it is necessary to reduce weight of embedded equipment's dedicated to management, conversion and distribution of electrical energy. The sizing and the optimization of embedded equipment's weight is a critical issue in the development of more electrical aircraft. This weight is mostly defined by heat transfer systems, when we consider the sizing of energy conversion system A lot of heat transfer system exists and are dedicated to the cooling of power converters. We selected two of these heat transfer system, in order to produce models of them. These models will be used in optimization routines. Plate fin heat sink in forced convection, and system assembly, combining heat pipe and plate fin heat sink, will be modelled during this thesis. Analytical models of these heat transfer systems will be developed, to optimize their weight and ensure a good cooling of electrical systems. Even if lots of dimensioning and optimization methods exists, dedicated to heat transfer systems, we choose to use analytical modelling. This kind of models gives an exact solution to the heat equation, to describe simple geometric and thermic configurations. Selected heat transfer systems can be simply described. The main advantage of these models is that it represents the thermal behavior of the system as a function of its geometrical parameters, materials and environmental conditions. Execution of these models is very fast and gives a precise solution of the thermal parameters of the described configuration. There is then a real interest to use this type of models to optimize weight of heat transfer systems, and then power converter
Lamy, Christophe. "Novel accurate tyre slip angle measurement means : application to tyre model identification." Thesis, Mulhouse, 2010. http://www.theses.fr/2010MULH3256.
Повний текст джерелаThe road traffic becomes more and more dense so that the active safety of road vehicles must continuously improved. This especially requires the improvement of the vehicle dynamics. The major part of the forces applied by the road to the vehicle are issued of the tyres. So, an accurate knowledge of the tyre-road interaction is primordial. This especially requires the development of the modelling and the identification of tyre models in the phases of design and tuning of a vehicle. The main goal of the thesis project is the contribution to a better determination of the dynamic functioning point of the system tyre/wheel. More accurately, is aims at improving the tyre slip angle determination accuracy, which is still insufficient for the analysis of tyre performance from vehicle-on-track tests. This determination is performed simultaneously to the determination of the other variables required in study of the tyre-road interface: longitudinal slip ratio, camber angle, tyre forces and moments. This project has been made in collaboration with the Research Department of Renault and the MIPS laboratory of the University of Haute-Alsace. Preliminary studies carried out by Renault and MIPS on this topic have served as a support to this project. A study carried out at the beginning of the thesis has helped to the determination of exhaustive requirements, in terms of tyre slip angle measurement performance, allowing the study of the vehicle dynamics with a sufficient accuracy, using performance indicators. A novel tyre slip angle measurement means has been developed in the thesis, in order to fit these requirements. It is based on the combination of inertial and GPS data near the wheel rim edge plane, using a extended Kalman filter (EKF). A dedicated measurement sensor (INS/GPS) has then be designed, developed and embedded in a test vehicle. The measurement performance of the novel INS/GPS has been validated according to the requirements, following a characterization procedure which has been specifically designed in the thesis. The tyre slip angle is then measured with an accuracy of 0.1° (at 3σ) in a range of 360°, with a insensitivity to the texture and the granularity of the road, contrary to the existing industrial solutions. When this novel measurement means is coupled with other standard measurements in vehicle dynamics, the whole motion of the wheel rim is then also determined with the required accuracy. This is made possible by mounting only one sensor at the level of the wheel rim edge plan, which helps to limit the inertia added to the wheel, in comparison with the existing measuring systems.A strategy of identification of a tyre model (Magic Formula 5.2) has been proposed and validated experimentally, in order to validate the novel measurement means developed. A Simplex optimization algorithm has been developed for the identification of a tyre model, from measurements (on a track or on a test rig) and/or simulation data. So, the tyre model parameters can be optimized in the phase of vehicle design, in order to fit well know vehicle performance indicators. The accurate INS/GPS measurements, combined with the optimization algorithm, are now especially used for the identification of tyre models from vehicle-on-track measurements and for the determination of the tyre model parameters required in the design phase. The novel INS/GPS is also considered as a reference for the tyre slip angle measurement, whatever the road grip (dry, wet, snow covered, ice covered ...). A number of research collaborations, especially with a worldwide tyre manufacturer, are been launched following the thesis results, especially for the study of the correlation between the physical tyre properties and the vehicle dynamics
Torregrosa, Jaime Bárbara. "Modelling and analysis of an air-conditioning system for vehicles based on magnetocaloric refrigeration." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/68503.
Повний текст джерела[ES] En la presente tesis doctoral se ha estudiado la aplicación de un refrigerador magnético en un sistema de aire acondicionado para automóviles. Con el fin de determinar las prestaciones de dicho sistema de manera global y precisa, se ha desarrollado un modelo térmico de cada uno de sus componentes. Por un lado, se ha desarrollado un modelo dinámico unidimensional de regenerador magnético activo (AMR) de placas planas paralelas, basado en un nuevo esquema numérico que reduce el tiempo de cálculo hasta en un 88% respecto al esquema más empleado. El modelo reproduce con gran exactitud los casos de regenerador con solución analítica y ha sido validado exhaustivamente con resultados experimentales funcionando como regenerador pasivo y como AMR. Para obtener buenos ajustes ha sido clave la inclusión en el modelo de las propiedades magnetocalóricas medidas experimentalmente con una muestra del material empleado, el efecto desmagnetizante, la mala distribución del fluido y las pérdidas hacia el ambiente del montaje experimental. La influencia de las incertidumbres y las simplificaciones en el modelado de estos fenómenos se ha analizado detalladamente, lo cual ha permitido validar diferentes aproximaciones. Por otro lado, se ha desarrollado un modelo dinámico del sistema de aire acondicionado de un vehículo eléctrico. Se incluye el modelo térmico de la cabina, los bucles hidráulicos para la distribución de la potencia térmica con los intercambiadores de calor agua-aire y los auxiliares eléctricos. La metodología empleada para el desarrollo de estos modelos, basada en la combinación de ecuaciones de conservación con el ajuste semi-empírico de los coeficientes globales de transmisión de calor, ha producido excelentes resultados de validación con resultados experimentales en un amplio rango de condiciones de funcionamiento. El modelo del vehículo se ha empleado para obtener la demanda de refrigeración y calefacción de un minibús eléctrico comercial, así como las temperaturas de funcionamiento del sistema. Con el modelo de AMR se ha llevado a cabo un amplio estudio de optimización para determinar los parámetros de diseño y de funcionamiento de dicho refrigerador que cubren las necesidades de refrigeración del vehículo una masa del conjunto del sistema y un consumo eléctrico mínimos, incluyendo el consumo de los auxiliares. Adicionalmente se han calculado las prestaciones de calefacción de las combinaciones óptimas. La aplicabilidad de este sistema en automóviles se analiza en comparación con un sistema equivalente de compresión de vapor.
[CAT] En aquesta tesi doctoral s'ha estudiat l'aplicació d'un refrigerador magnètic en un sistema d'aire condicionat per a automòbils. A fi de determinar les prestacions d'aquest sistema de manera global i precisa, s'ha desenvolupat un model tèrmic de cadascun dels components. D'una banda, s'ha desenvolupat un model dinàmic unidimensional de regenerador magnètic actiu (AMR) de plaques planes paral·leles, basat en un nou esquema numèric que redueix el temps de càlcul fins d'un 88% respecte a l'esquema més emprat. El model reprodueix amb gran exactitud els casos de regenerador amb solució analítica, i ha sigut validat exhaustivament amb resultats experimentals funcionant com a regenerador passiu i com a AMR. Per a obtenir bons ajustos ha sigut clau la inclusió en el model de les propietats magnetocalòriques mesurades experimentalment amb una mostra del material emprat, l'efecte desmagnetitzador, la mala distribució del fluid i les pèrdues cap a l'ambient del muntatge experimental. La influència de les incerteses i les simplificacions en la modelització d'aquests fenòmens s'ha analitzat detalladament, la qual cosa ha permès validar diferents aproximacions. D'altra banda, s'ha desenvolupat un model dinàmic del sistema d'aire condicionat d'un vehicle elèctric. S'hi inclouen el model tèrmic de la cabina, els bucles hidràulics per a la distribució de la potència tèrmica amb els bescanviadors de calor aigua-aire i els auxiliars elèctrics. La metodologia emprada per al desenvolupament d'aquests models, basada en la combinació d'equacions de conservació amb l'ajust semiempíric dels coeficients globals de transmissió de calor, ha produït excel·lents resultats de validació amb resultats experimentals en un ampli rang de condicions de funcionament. El model del vehicle s'ha emprat per a obtenir la demanda de refrigeració i calefacció d'un minibús elèctric comercial, així com les temperatures de funcionament del sistema. Amb el model d'AMR s'ha dut a terme un ampli estudi d'optimització per determinar els paràmetres de disseny i de funcionament de la refrigeradora esmentada que cobreixen les necessitats de refrigeració del vehicle, una massa del conjunt del sistema i un consum elèctric mínims, incloent el consum dels auxiliars. Addicionalment s'han calculat les prestacions de calefacció de les combinacions òptimes. L'aplicabilitat d'aquest sistema en automòbils s'analitza comparant-la amb la d'un sistema equivalent de compressió de vapor.
Torregrosa Jaime, B. (2016). Modelling and analysis of an air-conditioning system for vehicles based on magnetocaloric refrigeration [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/68503
TESIS
Premiado
Rotunno, Giuliana. "Integrated techniques for the internal logistics analysis and management of complex systems." Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8531.
Повний текст джерелаIn the context of manufacturing systems management, a decisive role is played by logistics, which may be defined as a planning and organization process aimed at optimizing the flow of material and information within and outside the company. In detail, the internal logistic systems are an important part of the modern industry and their design is challenging due to high complexity and heterogeneity of the manufacturing plants. Moreover, the analysis and management of the logistics in complex manufacturing systems is a widely discussed research topic in the related scientific literature. In this thesis the study of the internal logistic, and specifically application to manufacturing system, is taken into account in relation to the complexity features that characterize such systems. Despite the numerous contributions in the related literature proposing manufacturing logistic management approaches, few attempts were made to propose systematic techniques that, while improving the manufacturing system internal logistics and the related performances, are able to assess the manufacturing dynamics and the corresponding improvement. Therefore, the research results presented in this thesis are focused on the development of twoinnovative strategies and integrated techniques to analyze and manage the internal logistics of complex manufacturing systems. First, we present a novel hierarchical and iterative technique for the analysis and lean management of the internal logistics of discrete manufacturing systems. The technique efficiently integrates the Value Stream Mapping (VSM) tool, the Analytic Hierarchy Process (AHP) methodology and discrete event simulation in order to systematically improve the manufacturing system behaviour by rigorously assessing the system dynamics and corresponding performance indicators. Second, we deal with the scheduling of operations in Steelmaking and Continuous Casting (SM-CC) plants. Despite the numerous contributions, all the published papers in the field two limitations in real applications: (i) they do not consider the detailed description of the complete system from the structural and dynamic viewpoints; (ii) the authors focus on the process of the SM-CC plant and do not consider some peculiar characteristic of the main machines involved on the process, such as the continuous casting machines. In order to face the problem of the management and optimization of the production in the steel making continuous casting we propose an integrated a methodology to describe, assess and improve the logistics of the SM-CC processes: the Unified Modeling Language (UML), the discrete event simulation and the Mixed Integer Linear Programming (MILP) formulation. The application of the techniques to some real cases studies shows the effectiveness of the proposed management and optimization strategies.
XXV Ciclo
1979
Sassi, Kamal M. "Optimal scheduling, design, operation and control of reverse osmosis desalination : prediction of RO membrane performance under different design and operating conditions, synthesis of RO networks using MINLP optimization framework involving fouling, boron removal, variable seawater temperature and variable fresh water demand." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5671.
Повний текст джерелаScolan, Simon. "Développement d'un outil de simulation et d'optimisation dynamique d'une centrale solaire thermique." Thesis, Pau, 2020. http://www.theses.fr/2020PAUU3007.
Повний текст джерелаIn the current climate and energy context, solutions must be found to gradually replace the use of fossil fuels. Solar thermal energy is a resource with great potential that is still insufficiently exploited in France on an industrial scale. In this context, large solar thermal installations are increasingly studied. Currently, a majority of studies focus on optimizing the sizing of the plants based on standard operating strategies. This manuscript offers a mathematical resolution methodology for the simulation and dynamic optimization of a solar thermal plant. This type of optimization makes it possible to take into account the dynamics of this system and in particular the slow dynamics of a thermal energy storage. It is carried out by exploiting the degrees of freedom of the problem. By leaving certain design parameters free, dynamic optimization makes it possible to optimize the operation and sizing of the plant simultaneously.The different elements of a solar thermal plant (solar field, heat exchanger, thermal energy storage, pumps, pipes) are modeled and form a Differential Algebraic Equation system. We have described the orthogonal collocation method which allows to discretize these equations and thus, to obtain a system comprising only algebraic equations. Different models are confronted with experimental data from a plant located in Condat-sur-Vézère (France). Their precision is quantified. The development of a method by successive simulations and initializations allowed us to carry out the dynamic simulation of a solar thermal plant. However, certain operating constraints (control rules necessary to saturate the degrees of freedom) are difficult to formulate in a coherent and implementable way in the GAMS software used in this work. The interest of using dynamic optimization is to take advantage of the degrees of freedom of the problem in order to minimize / maximize an objective function (while respecting the constraints of the problem) without having to formulate constraints to saturate them.A first dynamic optimization problem was formulated and then solved, using an equation-oriented strategy. Over a five-day time horizon and with a fixed plant sizing, we have maximized the benefits from the sale of solar heat to a consumer by optimizing the operation of the plant. This notably brought to light counter-intuitive operating strategies allowing a significant improvement of the objective function compared to more standard strategies. In particular, the use of a dynamic inclination of the flat-plate collectors (as with a solar tracking device) has proved effective, on the one hand, to increase the energy captured by the solar field and, on the other hand, to handle possible overheating by defocusing the collectors from the maximum energy capture trajectory. The use of a thermal energy storage was also useful to allow the phase difference between production and demand.The formulation of a second optimization problem, over a time horizon of one year, made it possible to minimize the average cost of solar heat sold to the consumer (over the duration of the project) by determining the optimal sizing of the plant and the optimal time profiles of the operating variables as a function of the load curve. Difficulties have been encountered, in particular to maintain consistent operation over the optimization period. Finally, we listed a number of leads that could potentially improve the results obtained
Gonçalves, Da Silva Pinto Wagner José. "Modelling airframe noise : from aerodynamic topology to acoustic efficiency." Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2289.
Повний текст джерелаThe influence of the shape on the sound emission of cylindrical bluff-bodies is studied. Simulations are performed in two-dimensions (2D) at low-Reynolds number (Re=20-200), with the incompressible direct Navier-Stokes (DNS) solver incompact3D, using the Immersed Boundary Method (IBM) formalism; the acoustic emission is evaluated by a single formula derived from Curle’s equation for compact cylinders. In anechoic wind tunnel, the acoustic signature is measured for about 30 geometries, Re=4,000-53,000; hot-wire measurements of the spanwise flow characteristics are performed for a subset of the tested cylinders. The influence of both the shape of the upstream portion of the geometry and the breadth-to-height ratio (AR) are proved to be major features in terms of both the flow and its acoustic emission in 2D. By reducing the strength of the vortices and pushing them downstream and affecting the mechanics of the von Kármán instability (delaying the transition to unsteadiness), stretched shapes (with higher AR) are generally quieter. From the experiments, it is found that the geometries of biggest AR are the loudest, contraposing the results obtained in 2D. The disparity is justified by a significant increase of the spanwise coherence associated with the larger AR’s, practically fully-phased, thus more acoustically efficient. Globally, it is implied that geometries which have weakly perturbed flow in 2D, marked by a later transition to unsteadiness (larger critical Reynolds number), are also more organized in 3D, high-Reynolds number regimes. The underlying relationship between low and high-Reynolds number transitions must be further investigated
Richtr, Jiří. "Využití diskrétní simulace při řízení výrobního procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2011. http://www.nusl.cz/ntk/nusl-223057.
Повний текст джерелаLoos, Florian [Verfasser], Hans-Dieter [Akademischer Betreuer] Ließ, and Thomas [Akademischer Betreuer] Apel. "Joule Heating in Connecting Structures of Automotive Electric Devices – Modelling, Simulation and Optimization / Florian Loos. Universität der Bundeswehr München, Fakultät für Bauingenieurwesen und Umweltwissenschaften. Gutachter: Hans-Dieter Ließ ; Thomas Apel. Betreuer: Hans-Dieter Ließ." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2014. http://d-nb.info/1058176838/34.
Повний текст джерелаLiu, Xing. "Modélisation, analyse et optimisation de la résilience des infrastructures critiques interdépendantes." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC080.
Повний текст джерелаResilience is the ability of a system to resist to and recover from disruptive events. The objective of this thesis is to build a framework of analysis and optimization of interconnected critical infrastructures (ICIs) resilience. In this work, the original scientific contributions include: 1) a generic modeling approach to describe the dynamic behavior and the physical cascading failure processes in ICIs.2) on the basis of the model, a quantitative resilience assessment approach for ICIs is proposed, where both the mitigation and recovery aspects of system resilience are evaluated; 3) in order to reduce the computational cost in the case of large-scale systems, three different global sensitivity analysis methods (ANN estimation, ensemblebased, give-data estimation) are implemented to identify the most relevant model parameters affecting the system resilience, and then the performance of these methods are compared; 4) a hierarchical model is developed to characterize the factors of resilience improvement strategies. A multi-objectives optimization problem is formulated and solved by NSGA-II algorithm, to provide the optimal plan for system resilience improvement. The methods proposed are implemented to applications, e.g., a gas supply network and an electrical power grid
Ajimotokan, Habeeb A. "A study of trilateral flash cycles for low-grade waste heat recovery-to-power generation." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9202.
Повний текст джерелаFabre, Florian. "Conduite orientée ordonnancement d'un simulateur dynamique hybride : application aux procédés discontinus." Thesis, Toulouse, INPT, 2009. http://www.theses.fr/2009INPT023G/document.
Повний текст джерелаThis thesis presents works which aim to incorporate a scheduling module (ProSched) to an environment for modeling and dynamic hybrid simulation PrODHyS in order to automate the generation of scenarios for simulation of batch processes based on a recipe and a list of production orders (OF). The methodology developed is based on a mixed optimization / simulation approach. In this context, three key points have been developed in this work: - First, design and develop reusable components (recipe classes) for the hierarchical and systematic modeling of the sequencing of unit operations. For this, the notions of Task token and macro-place have been introduced in the RdPDO formalism and allow the modeling of recipes by assembling these predefined components. - Secondly, define a generic mathematical model of scheduling based on a well defined graphical formalism (RTN) that models the main characteristics of batch processes and provide all input data necessary to the simulation model. For this, a MILP model based on the Unit Specific Event formulation has been implemented. - Finally, define the interface between the optimization model and the simulation model through the concept of control place and decision-making center at the simulator level. In this context, various strategies of mixing optimization and simulation are proposed. The potential of this approach is illustrated by the simulation of a complete manufacturing process
Gely, Laurent. "Modélisation et optimisation de la gestion opérationnelle du trafic ferroviaire en cas d’aléas." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14177.
Повний текст джерелаOn-line re-scheduling of trains aims to find accurate solutions after an incident has occurred on the railway network. When we consider a large area, solutions consist in calculating new timetables, sequences and routes of trains. This problem asks for decision support tools based on operational research techniques.This thesis aims to develop solutions toward an operational tool, it articulates around three main parts. The first part defines an exhaustive model of the railway system operations and a multiscalable description of the infrastructure.The second part presents three mathematical models of the rescheduling problem associated with this description. We preset a exhaustive continuous time based model including headways that take into account speeds of trains, plus a discrete time based model and an hybrid model combining both formulations.The last part describes first implementations and the global framework we need to develop in order to solve the real world problem. It emphases on expected synergies, specilaly between simulation and optimization techniques
Hayati, Abolfazl. "Natural Ventilation and Air Infiltration in Large Single‑Zone Buildings : Measurements and Modelling with Reference to Historical Churches." Doctoral thesis, Högskolan i Gävle, Energisystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24612.
Повний текст джерелаNaturlig ventilation är den dominerande ventilationsprocessen i äldre byggnader såsom kyrkor, och även i de flesta småhus i Sverige och övriga delar av världen. Luftinfiltration och vädring utgör viktiga komponenter i naturlig ventilation, där luftinfiltration är luftflöde genom oavsiktliga läckage i byggnadsskalet, medan vädring är avsiktligt luftutbyte genom stora öppningar såsom fönster och dörrar/portar. Vädring kan i sin tur ske ensidigt (genom en öppning) eller som tvärdrag (genom två eller flera öppningar belägna på olika ytterväggar). Det totala luftutbytet påverkar värmeförluster och inomhusluftens kvalité. I kyrkor orsakar avsättning av luftpartiklar en gradvis nedsmutsning av invändiga ytor, inklusive väggmålningar och andra konstföremål. Betydande mängder partiklar avges från besökare, tända ljus, rökelse, o.d. Tillfällig vädring kan minska detta problem, men även användas för att justera innetemperaturen. Föreliggande studie analyserar mekanismer och predikteringsmodeller gällande luftinfiltration och dörrvädring genom fältmätningar, vindtunnelförsök och datorsimuleringar. Luftinfiltration och vädring har samma drivkrafter, d.v.s. vind och termik (inne‑ute temperaturskillnader). Båda dessa drivkrafter är svåra att predicera, särskilt vindinducerade flöden och kombinationen av termik och vind. Två av de mest etablerade modellerna för luftinfiltrationsprediktering i byggnader har utvärderats via mätningar i tre kulturhistoriska stenkyrkor i Sverige. En korrigeringsfaktor av 0,8 föreslås för bättre prediktion av den ena modellen (som gav bäst resultat) gällande höga en-zonsbyggnader såsom kyrkor. En detaljerad numerisk modell är utvecklad för luftinfiltrationsprediktering, där indata baseras på fältundersökningar, inkl. IR-termografering och uppmätt av neutrala tryckplanet (NPL). Modellens funktionalitet har validerats via mätningar i en av fallstudierna och pekar på tämligen god prediktionsprestanda. Vidare utveckling av modellen föreslås, inkl. ett mer systematiskt kalibreringssystem, för olika typer av byggnader och väderförhållanden. Gällande vädring mättes både ensidigt flöde och tvärdrag genom portar i olika kyrkobyggnader med hjälp av spårgas samt direkta lufthastighetsmätningar i portöppning. Mätresultaten jämfördes med erhållna prediktioner från fyra tidigare utvecklade modeller för ensidig ventilation. De modeller som tog hänsyn till vindturbulens gav något bättre resultat. Enligt utförda mätningar medför en timmes ensidig portvädring i en kyrka cirka 50 % luftutbyte, vilket indikerar att detta är en tillämpbar ventilationsmetod, även för så pass stora byggnadsvolymer. Ett särskilt vädringsdiagram presenteras, som syftar till att underlätta uppskattning av erforderlig vädringsperiod. Vidare studerades predikteringsprestanda hos IDA Indoor Climate and Energy (IDA-ICE) simuleringsprogram avseende vädring, där simuleringsdata jämfördes med fältmätningar i en kyrka. Programmets prediktion av ensidigt luftflöde genom en öppen kyrkport var av samma storlekordning som det uppmäta; dock klarade programmet inte av att hantera inverkan av vindriktning så väl, vilket pekar på en utvecklingspotential. Avslutningsvis undersöktes vinddrivet flöde igenom portöppningar i en kyrkmodell i vindtunnel, där luftomsättningen mättes med hjälp av spårgasmetoden. Vid ensidig vädring observerades högre flöde vid högre vindturbulens och när öppningen var på vindsidan av byggnaden, i överensstämmelse med fältmätningarna. Dessutom var vädringsflödet vid tvärdrag i storleksordningen 15 högre än det vid ensidig vädring. Det verkar alltså som att man kan öka vädringstakten avsevärt om man kan åstadkomma tvärdrag. Kalibreringskonstanter presenteras också för en enkel ekvation för vinddrivet flöde genom portar. Vindtunnelstudien indikerar vidare att advektion genom turbulens är en viktigare vädringsmekanism än pumpning. Föreliggande arbete bidrar med kunskap speciellt kring luftinfiltration och vädring genom portar i höga en-zonsbyggnader. Resultaten kan även vara tillämpliga på andra typer av höga en-zonsbyggnader såsom industrihallar, atrier/ljusgårdar och idrottshallar.
Church project
Grandicki, Andreas, and Mattias Lokgård. "Parametric CAD Modeling to aid Simulation-Driven Design : An evaluation and improvement of methods used at Scania." Thesis, Linköpings universitet, Maskinkonstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138121.
Повний текст джерела