Dissertations / Theses: 'Simulation modeling platform'

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Baloch, Adeel. "Graphical Web Interface for OpenModelica Platform." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-89858.

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“OPENMODELICA is an open-source Modelica-based modeling and simulation environment intended for industrial and academic usage. Its long-term development is supported by a non-profit organization – the Open Source Modelica Consortium (OSMC).” OpenModelica aims to provide an enhanced, Open Source Modelica modeling and simulation environment and this thesis is an addition in this direction. The purpose of this thesis is to create a web based graphical connection editor. There are other open-source connection editors available, but these editors were desktop applications. There is one web based editor but it is a textual editor. Desktop applications need installation and space on the local system. OMWeb connection editor is the first web based graphical connection editor that runs on a web browser. It’s a web platform for OpenModelica and provides the environment for modeling and simulation in the Modelica Modeling Language. The OMWeb connection editor can run on any system without the need for an OpenModelica installation. If a system is connected to the internet, and contains a web browser, it can run the OMWeb connection editor. The OMWeb connection editor uses Java Runtime Environment to run an applet in the browser. The user can create models graphically; but they can also be viewed in the textual format. The user can simulate and plot his models. The plot file generated for the model can be downloaded from the server. The OMWeb Connection Editor uses Servlet to handle requests from the client. The servlet is responsible for the communication with OpenModelica Compiler. It also gets the results from OMC and sends them back to the client. In our case the browser is the client.

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Sterle, Lance. "Modeling Path Dependent Derivatives Using CUDA Parallel Platform." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu149263565284954.

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ALBUQUERQUE, ALLAN NOGUEIRA DE. "MODELING AND SIMULATION OF A STEWART PLATFORM CONTROLLED USING INERTIAL SENSORS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21834@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Simuladores de movimentos são sistemas mecatrônicos que reproduzem as principais atitudes e movimentos de um veículo. Neste estudo serão analisados simuladores baseados em mecanismos com 3 e 6 graus de liberdade. No segundo caso, o mecanismo é capaz de reproduzir todos os ângulos de atitude (rolagem, arfagem e guinada) e todos os deslocamentos lineares (lateral, vertical e longitudinal) com limitações, porém com amplitude suficiente de modo a possibilitar os principais movimentos associados ao veículo. O uso de transdutores de deslocamento linear nestes mecanismos articulados introduzem elevados efeitos de inércia, além de aumentar a massa dos mesmos, diminuindo sua relação carga/peso e sua eficiência. Atualmente, o grande desenvolvimento de sensores do tipo unidade de medição inercial (IMU) aumentou a disponibilidade destes no mercado e reduziu muito seu custo. Como se trata de acelerômetros triaxiais em conjunto com girômetros também triaxiais, sensores como este podem ser usados para determinar a posição e a orientação no espaço de mecanismos com seis graus de liberdade, como a Plataforma Stewart. Neste trabalho será desenvolvida uma metodologia para modelagem da cinemática de mecanismos paralelos baseada nos derivativos de suas matrizes jacobianas. Esta metodologia é avaliada em um mecanismo paralelo plano de três graus de liberdade e em uma Plataforma Stewart. Com a metodologia de modelagem validada, é implementada uma estratégia de controle baseada no uso de um sensor tipo central inercial para o controle de posição, velocidade e aceleração destes mecanismos. Os resultados das simulações indicam a possibilidade do uso destes sensores nestes tipos de equipamentos e apontam para a necessidade de avaliar esta metodologia em testes experimentais.
Movement simulators are mechatronic systems that reproduce the main attitudes and movements of a vehicle. In this study are examined simulators based on 3 and 6 degrees of freedom mechanisms. In the second case, the mechanism is able to reproduce all the attitude angles (roll, pitch and yaw) and all the linear displacements (sway, heave and surge) with limitations, but with sufficient amplitude to enable the main movements associated with the vehicle. The use of linear displacement transducers in these articulated mechanisms introduce high inertia effects and increase the mass, decreasing the load/weight ratio and efficiency. Currently, the great development of the inertial central type sensors (IMU – Inertial measurement unit) increased the availability of these transducers on market and greatly reduced cost. Since this is a conjunct of triaxial accelerometers with triaxial gyrometers, sensors such as these ones can be used to determine the position and orientation in space of mechanisms with six degrees of freedom, such as the Stewart Platform. In this work it will be developed a methodology for modeling the kinematics of parallel mechanisms based on derivatives of their jacobian matrices. This methodology is evaluated in a planar parallel mechanism of three degrees of freedom and on a Stewart Platform. With the modeling methodology validated, a control strategy based on the use of an inertial unit type sensor for controlling the position, velocity and acceleration of these mechanisms is implemented. The simulations results indicate the possibility of using these sensors in these types of equipment and point to the need to evaluate this methodology in experimental tests.

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Březina, Lukáš. "Optimization of a Parallel Mechanism Design with Respect to a Stewart Platform Control Design." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233905.

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Předkládaná práce se zabývá návrhem modelu dynamiky paralelního manipulátoru optimálního pro účely návrhu řízení. Zvolený přístup je založen na modelování dynamiky systému v simulačním prostředí Matlab SimMechanics následovaném linearizací modelu. Výsledný stavový lineární model mimo jiné umožňuje snadné posouzení řiditelnosti a pozorovatelnosti modelu. Díky své relativní jednoduchosti je model také výpočetně nenáročný. Přístup je demonstrován na návrhu dvouvrstvého řízení SimMechanics modelu Stewartovy platformy, na kterém bylo následně navržené řízení úspěšně testováno. Podstatná část práce obsahuje přístup k modelování neurčitých parametrů dynamického modelu Stewartovy platformy a stejnosměrného motoru Maxon RE 35 a jeho výsledky. Předložený přístup je založen na modelování parametrické neurčitosti způsobem, kdy je neurčitost definována individuálně pro jednotlivé prvky stavových matic modelu. Samotná neurčitost je potom určena rozdílem mezi jednotlivými parametry příslušných matic nominálního modelu a modelu se stanovenou maximální neurčitostí parametrů. Výsledný neurčitostní model je vzhledem ke své stavové reprezentaci vhodný pro návrh regulátoru založeném na metodách návrhu robustního řízení, například minimalizaci normy H-nekonečno. Popsaná metoda byla použita pro kompenzaci posunu mezi pracovními body, okolo kterých je prováděna linearizace a pro kompenzaci nepřesnosti modelování vybraných parametrů modelů Stewartovy platformy a stejnosměrného motoru. Získané modely (v prostředí SimMechanics a neurčitostní model) byly experimentálně porovnány s chováním jednoho z lineárních pohonů Stewartovy platformy. Rozdíl v datech obdržených ze simulace v prostředí SimMechanics a naměřených na reálném stroji byl téměř kompletně pokryt neurčitostním modelem. Prezentovaná metoda neurčitostního modelování je velice univerzální a aplikovatelná na libovolný stavový model.

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Smith, Harrison B. "The Language And Platform Independent Steering (LAPIS) System." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337879192.

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Girmay, Mesele Asmelash. "AUTOSARLang: Threat Modeling and Attack Simulation for Vehicle Cybersecurity." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240410.

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The rapid growth and development of the Information and Communications Technology attract many industries including the automotive industry. Since the last four decades, the automotive engineering has been impacted by the Information Technology. Nowadays, modern vehicles are being designed with up to hundreds of electronic control units (ECUs) and be able to communicate with other vehicles, infrastructure, and other things via wireless networks and sensors. For such in-vehicle networks, serial bus systems like CAN bus, LIN bus, FlexRay, and MOST are standardized. Parallel to this, the automotive industry vendors designed and standardized automotive open systems architecture (AUTOSAR) software platform. AUTOSAR has two main standards - the classical platform and adaptive platform. The classical platform (CP) is designed for the current embedded ECUs, whereas the adaptive platform (AP) is being designed for the future intelligent ECUs. The intelligent AP ECU constitute many multi-processing processors and Ethernet to realize the future autonomous vehicles.On the other hand, automotive industries shall ensure “safety first” in their design and regard it as part of their market feature. Directly or indirectly, the safety of the modern connected vehicles is related to their cybersecurity. Today, cybersecurity professionals are conducting researches to bring remarkable solutions to the sophisticated cyberattacks. One approach of cybersecurity solution is to make a cyber threat modeling and attack simulations. Example, meta-attack-language (MAL) is a threat modeling and attack simulation language, which is designed to make domain-specific threat analysis.In this study, potential assets of an automotive vehicle with AP ECUs are identified. Then, threats of each identified asset are collected from different literature. With both inputs, a cyber threat model is written using MAL. Finally, validation of the model is made with a simulation language. Consequently, modern vehicle with AP ECUs is modeled and simulated.This study contributes four important things - list of potential assets that AP running vehicle constitutes, collected list of threats of the identified assets, validated cyber threat model, and simulation test cases for each potential attack paths in the model.
Den snabba tillväxten och utvecklingen av informations- och kommunikationstekniken lockar många‌ branscher, däribland bilindustrin. Sedan de senaste fyra decennierna har automotive engineering påverkats av informationstekniken. Numera är moderna fordon utformade med upp till hundratals elektroniska styrenheter (ECU) och kan kommunicera med andra fordon, infrastruktur och andra saker via trådlösa nätverk och sensorer. För sådana inbyggda nätverk är seriella bussystem som CAN-buss, LIN-buss, FlexRay och MOST standardiserade. Parallellt med detta har automotive-leverantörerna utformat och standardiserat automatsystem för öppna systemarkitekturer (AUTOSAR). AUTOSAR har två huvudstandarder - den klassiska plattformen och den adaptiva plattformen. Den klassiska plattformen (CP) är utformad för nuvarande inbyggda ECU, medan den adaptiva plattformen (AP) är utformad för framtida intelligenta ECU. Den intelligenta AP-enheten utgör många processorer och Ethernet för att förverkliga de framtida autonoma fordonen. Bilindustrin ska å andra sidan säkerställa "säkerhet först" i sin design och betrakta den som en del av deras marknadsfunktion. Direkt eller indirekt är säkerheten hos moderna anslutna fordon relaterad till sin cybersäkerhet. Idag genomför cybersecurity-proffs för att få anmärkningsvärda lösningar på de sofistikerade cyberattackarna. Ett tillvägagångssätt för cybersecurity-lösningen är att göra en modellering av cyberhot och attack simuleringar. Exempel, meta-attack-language (MAL) är ett hot modellerings-och attack simuleringsspråk, som är utformat för att göra domänspecifik hotanalys. I denna studie identifieras potentiella tillgångar i ett fordonsbil med AP-ECU. Därefter samlas hot av varje identifierad tillgång från olika litteratur. Med båda ingångarna skrivs en cyber-hotmodell med MAL. Slutligen görs validering av modellen med ett simuleringsspråk. Följaktligen modelleras och simuleras moderna fordon med AP-ECU. Denna studie bidrar till fyra viktiga saker - en lista över potentiella tillgångar som AP-körfordon utgör, samlad lista över hot av identifierade tillgångar, validerad cyberhot-modell och simuleringsprovfall för varje potentiell attackvägar i modellen.

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Skoglund, Pascal, and Tobias Peterson. "Development of a Simulation Platform Addressing the Digitalization of the Stockholm Healthcare System." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-227193.

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As e-Health solutions start being integrated into the healthcare system in Stockholm County, the possibility of moving monitored patients out of the hospitals and into their homes increases. Such a change in the healthcare system could require a major redistribution of resources in order to meet possible changes in resource demands. Simulations can be used in order to understand how the healthcare system needs to adapt to handle the relocation of monitored patients. In this thesis project, a simulation platform has been designed and developed to address possible questions posed by this redesign of the healthcare system. By conducting a literary study, it was found that a discrete event- and agent based- hybrid simulation architecture could address the complexity required for such a large simulation environment by simulating across different abstraction levels. The agent based simulation component of the architecture models resources such as nurses, doctors, and patients as agents. A patient agent has a statechart which allows the patient to move between situational states and require interventions depending on a developed illness progression logic and routines. Interventions are modeled as event workflows in the discrete event simulation architecture. These cover most of the relevant interventions in a home monitored patient's life, such as nurse home visits and doctor video consultations. A communication protocol has been defined which will allow this model to communicate with a healthcare facility model. The platform implements a user interface for changing relevant input parameters, such as the amount of patients or doctors, in order to simulate different scenarios. Therefore the provided framework reduces the need for any major reprogramming between model runs. Outputs provided by simulation runs give relevant insights on patient resource usage and logistics management. A method for automatic generation of locations for patient homes and healthcare facilities on Geographic Information Systems open street maps has also been identified but not implemented. A validation process was conducted by allowing experts in the field to test the platform and give feedback on its validity and outputs. The simulation architecture provided by this thesis achieves the objective of modeling flows and resources in a further digitalized healthcare system in Stockholm County.

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Bowlin, Oscar E. "Modeling and simulation of the free electron laser and railgun on an electric Naval surface platform." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FBowlin.pdf.

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Bauer, Maria. "EVALUATING THE EFFECTIVENESS OF TRAINING SYSTEM APPROACHES FOR HIGHLY COMPLEX FLIGHT TRAINING." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3020.

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This research investigates the Training Effectiveness of a low-cost, PC-based training system when compared with two modes (motion and no motion) of a cab training system with large screen for various aviation flying tasks. While much research on this topic has been done in the past, advances in technology have significantly altered what is considered a "low-cost" "simulator." The technology advances have in effect increased the ability of a "low-cost" "simulator" to deliver desired experiences to the user. These "simulators" often are nothing more than PC training system, with only notional representations of the actual aircraft. This research considers the use of such training systems in training for a highly complex and dynamic task situation, that task being a search and rescue mission. A search and rescue mission is far more complex task than those studied for possible "low-cost" simulation substitution in the past. To address that aspect, one mode of the cab involves motion in two degrees of freedom. The results of this research advances the body of literature on the capability of "low-cost" simulation to deliver the experiences necessary to learn highly complex tasks associated with search and rescue as well as further clarify the extent to which a motion platform aides in flight training. This research utilizes available platforms provided by the US Army Research, Development and Engineering Command Simulation and Training Technology Center. Additionally, all the participants in the research are in training to be helicopter pilots. Participants were randomly assigned to one of three training configurations: a) Cab with motion turned ON, b) Cab with motion turned OFF and c) PC-based simulator. Training effectiveness is evaluated using measures for learning, task performance, and human factors. Statistically significant results are shown for the Cab with Motion and the Cab with No Motion configurations.
Ph.D.
Department of Industrial Engineering and Management Systems
Engineering and Computer Science
Industrial Engineering and Management Systems

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Hawasli, Ahmad. "azureLang: a probabilistic modeling and simulation language for cyber attacks in Microsoft Azure cloud infrastructure." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240406.

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Cyber-attack simulation is a suitable method used for assessing the security ofnetwork systems. An attack simulation advances step-wise from a certain systementry-point to explore the attack paths that lead to dierent weaknesses inthe model. Each step is analyzed, and the time to compromise is calculated.Attack simulations are primarily based on attack graphs. The graphs areemployed to model attack steps where nodes can represent assets in the system,and edges can represent the attack steps. To reduce the computational cost associatedwith building an attack graph for each specic system, domain-specicattack languages, or DSL for short, are used.The nal product of this thesis work is azureLang, a probabilistic modelingand simulation language for modeling Microsoft Azure cloud infrastructure.AzureLang is a DSL which denes a generic attack logic for MicrosoftAzure systems. Using azureLang, system administrators can easily instantiatespecic-system scenarios which emulate their Microsoft Azure cloud system infrastructure.After creating the model, attack simulation can be run to assessthe security of the model.
Cyberattacksimulering är en lämplig metod som används för att bedöma säkerhetenhos nätverkssystem. En angrepsimulering går stegvis från ett visst systeminmatningspunkt för att utforska angreppsbanorna som leder till olika svagheter i modellen. Varje steg analyseras och tiden för kompromettera beräknas.Attack-simuleringar baseras huvudsakligen på attackgrafer. Graferna används för att modellera angreppssteg där noder kan representera tillgångar i systemet, och kanterna kan representera attackenstegen. För att minska kostnaden för att skapa attackgrafer för varje specifikt system används domänspecifika språk eller DSL förkortat.Den slutliga produkten av detta examensarbete är azureLang, ett probabilistisk hotmodelleringsoch attacksimuleringsspråk för analys av Microsoft Azure Cloud Infrastructure. AzureLang är en DSL som definierar en generisk attacklogik för Microsoft Azure-system. Med hjälp av azureLang kan systemadministratörer enkelt ordna specifika systemscenarier som efterliknar deras Microsoft Azure cloudsystem infrastruktur. Efter att ha skapat modellen kan attack simu-lering köras för att bedöma modellens säkerhet.

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Pyle, David Carter. "Vertical replenishment airlift platform for the 21st century : an analysis using the Simulation Mobility Modeling and Analysis Toolbox (SMMAT) /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA303855.

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Sotnik, Garry. "SOSIEL: a Cognitive, Multi-Agent, and Knowledge-Based Platform for Modeling Boundedly-Rational Decision-Making." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4239.

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Decision-related activities, such as bottom-up and top-down policy development, analysis, and planning, stand to benefit from the development and application of computer-based models that are capable of representing spatiotemporal social human behavior in local contexts. This is especially the case with our efforts to understand and search for ways to mitigate the context-specific effects of climate change, in which case such models need to include interacting social and ecological components. The development and application of such models has been significantly hindered by the challenges in designing artificial agents whose behavior is grounded in both empirical evidence and theory and in testing the ability of artificial agents to represent the behavior of real-world decision-makers. This dissertation advances our ability to develop such models by overcoming these challenges through the creation of: (a) three new frameworks, (b) two new methods, and (c) two new open-source modeling tools. The three new frameworks include: (a) the SOSIEL framework, which provides a theoretically-grounded blueprint for the development of a new generation of cognitive, multi-agent, and knowledge-based models that consist of agents empowered with cognitive architectures; (b) a new framework for analyzing the bounded rationality of decision-makers, which offers insight into and facilitates the analysis of the relationship between a decision situation and a decision-maker's decision; and (c) a new framework for analyzing the doubly-bounded rationality (DBR) of artificial agents, which does the same for the relationship between a decision situation and an artificial agent's decision. The two new methods include: (a) the SOSIEL method for acquiring and operationalizing decision-making knowledge, which advances our ability to acquire, process, and represent decision-making knowledge for cognitive, multi-agent, and knowledge-based models; and (b) the DBR method for testing the ability of artificial agents to represent human decision-making. The two open-source modeling tools include: (a) the SOSIEL platform, which is a cognitive, multi-agent, and knowledge-based platform for simulating human decision-making; and (b) an application of the platform as the SOSIEL Human Extension (SHE) to an existing forest-climate change model, called LANDIS-II, allowing for the analysis of co-evolutionary human-forest-climate interactions. To provide a context for examples and also guidelines for knowledge acquisition, the dissertation includes a case study of social-ecological interactions in an area of the Ukrainian Carpathians where LANDIS-II with SHE are currently being applied. As a result, this dissertation advances science by: (a) providing a theoretical foundation for and demonstrating the implementation of a next generation of models that are cognitive, multi-agent, and knowledge-based; and (b) providing a new perspective for understanding, analyzing, and testing the ability of artificial agents to represent human decision-making that is rooted in psychology.

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Lara, Molina Fabian Andres. "Ambiente de simulação de manipuladores paralelos : modelagem, simulação e controle de uma plataforma Stewart." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265016.

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Orientador: João Mauricio Rosario
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-08-12T18:15:19Z (GMT). No. of bitstreams: 1 LaraMolina_FabianAndres_M.pdf: 3777126 bytes, checksum: 5d2bb864ea5a4dc9fb76ddeeeb83c38f (MD5) Previous issue date: 2008
Resumo: O presente trabalho recopila e aplica conceitos concernentes à modelagem dos manipuladores paralelos, desta maneira é proposta um ambiente de simulação para manipuladores paralelos aplicada à Plataforma Stewart. O manipulador paralelo de seis graus de liberdade - Plataforma Stewart é utilizado em aplicações que requerem alto desempenho de posicionamento: alta rigidez, alta razão capacidade de carga - peso do manipular, alta exatidão no movimento. Entre as aplicações nas quais se tem utilizado a Plataforma Stewart estão: simuladores de vôo, manipuladores cirúrgicos, máquinas ferramentas CNC, sistemas de locomoção bípedes, etc. São enfatizados aspectos concernentes à modelagem cinemática e dinâmica deste manipulador. A partir do modelo é proposta a simulação e controle de posição no espaço das juntas em MATLAB - SimulinkTM. A validação da simulação é feita mediante um estudo de casos
Abstract: The present work involves and applies parallel manipulator design concepts; therefore it is proposed a parallel manipulator design methodology applied to Stewart Platform. In this research project, it is modeled, simulated and analyzed the six degrees of freedom parallel manipulator - Stewart Platform. This system is used on applications with high position performance: high stiffness, high useful load - manipulator weigh and high accuracy. The Stewart Platform has been applied in: flight simulators, surgery manipulators, CNC machines, biped locomotion systems, etc. In this work are emphasized on Stewart Platform cinematic and dynamic modeling concepts. Based on manipulator model is proposed the simulation and joint space position control in MATLAB - SimulinkTM. The simulation is validated thought a case study
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica

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Alleau, Thibaut. "Development of a numerical platform to model the mitral valve." Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2649.

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L’insuffisance mitrale est la valvulopathie mondiale la plus fréquente avec une prévalence de 2%. Lorsque le patient n’est pas en mesure d’être opéré à cœur ouvert, un implant percutané est utilisé pour aider la fermeture des feuillets. Le seul implant actuellement disponible est basé sur la réparation bord à bord de la valve mitrale. Il réduit le reflux vers l’oreillette lors de la systole, mais n’est pas adapté pour les patients souffrant d’insuffisance mitrale fonctionnelle, chez qui la pathologie provient du ventricule et non des éléments de la valve. L’objectif de la thèse est de fournir une plateforme numérique permettant d’aider au développement d’un implant adapté pour ces patients. Plusieurs géométries de valve ont été réalisées au moyen d’un modèle paramétrique, en utilisant des données anatomiques. La dynamique de la valve a été modélisée avec le logiciel ADINA par des simulations éléments finis en grandes déformations. Des modèles structurels de la valve ont permis de représenter la fermeture de la valve sous une pression uniforme. Les lois de comportement de matériaux ont été développé dans le but d’obtenir une fermeture réaliste de la valve. Cela a nécessité la prise en compte de l’hyperélasticité et de l’anisotropie des tissus. Des pathologies valvulaires, telles que la dilatation de l’anneau mitrale ou la rupture des cordages tendineux ont été modélisées, et plusieurs méthodes ont été testées pour y apposer des systèmes médicaux. En utilisant une description ALE et un couplage monolithique, les interactions fluide-structure ont été simulées pour une valve mitrale bi-dimensionnelle. La fermeture hermétique de la valve pendant la systole a pu être reproduite et l’ouverture de la valve étudiée pendant la diastole. La plateforme numérique développée permet de modéliser la fonction de la valve mitrale et peut être utilisée pour aider au développement d’un implant mitral grâce au modèle paramétrique reproduisant différentes géométries de valve et aux lois matériaux anisotropes. Une perspective reste la création d’un modèle 3D des interactions fluide-structure de la valve mitrale
Mitral insufficiency is the first valvular disease worldwide, with a 2% prevalence. When open-heartsurgery is impossible for the patient, surgeons use percutaneous devices to help the mitral leaflets coapt. However, the only device currently available is based on the edge-to-edge mitral valve repair technique. This type of implant is not adapted for patients suffering from functional mitral insufficiency, where the ventricle is responsible for the lack of coaptation of the leaflets. This thesis aims to provide a numerical platform to help the development of a mitral valve implant adapted for those patients. Several mitral valve geometries were created from a parametric model using anatomical measurements. Finite element simulations of the mitral valve were performed using ADINA to determine the valve closure under constant pressure. Several material models were developed in large strain and large deformation to model the valve closure accurately. Pathological behaviour such as annulus dilatation and chordae rupture were modelled, and several methods were tested to implement medical devices. Fluid-structure interaction of a 2D mitral valve was obtained using an ALE description and a monolithic coupling approach. Both the systole and the diastole were reproduced and studied, and the hermetic seal of the valve was detailed. The numerical platform developed is suited to model mitral valve function and can be used to help the development of mitral implants. In addition, the parametric geometry model and the anisotropic material model will be useful to depict with realism the valve function. A 3D fluid-structure interaction of the mitral valve could be developed

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Pant, Gaurav, I. Felician Campean, Aleksandrs Korsunovs, Daniel Neagu, and Oscar Garcia-Afonso. "Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform." SAE, 2020. http://hdl.handle.net/10454/18376.

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Yes
This paper introduces a hybrid dynamic modelling approach for the prediction of NOx emissions for a Diesel engine, based on a multi-physics simulation platform coupling a 1-D air path model (GT-Suite) with in-cylinder combustion model (CMCL Stochastic Reactor Model Engine Suite). The key motivation for this research was the requirement to establish a real time stochastic simulation capability for emissions predictions early in engine development, which required the replacement of the slow combustion chemistry solver (SRM) with an appropriate surrogate model. The novelty of the approach in this research is the introduction of a hybrid approach to metamodeling that combines dynamic experiments for the gas path model with a zonal optimal space-filling design of experiments (DoEs) for the combustion model. The dynamic experiments run on the virtual Diesel engine model (GT- Suite) was used to fit a dynamic model for the parameters required as input to the SRM. Optimal Latin Hypercubes (OLH) DoE run on the SRM model was used to fit a response surface model for the NOx emissions. This surrogate NOx model was then used to replace the computationally expensive SRM simulation, enabling real time simulations of transient drive cycles to be executed. The performance of the proposed approach was validated on a simulated NEDC drive cycle against experimental data collected for the engine case study, which proved the capability of methodology to capture the transient trends for the NOx emissions. The significance of this work is that it provided an efficient approach to the development of a global model with real time transient modelling capability based on the integration of dynamic and local DoE metamodeling experiments.
The full-text of this article will be released for public view at the end of the publisher embargo on 12 Aug 2021.

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16

Modica, Tony [Verfasser], and Hartmut [Akademischer Betreuer] Ehrig. "Formal Modeling, Simulation, and Validation of Communication Platforms / Tony Modica. Betreuer: Hartmut Ehrig." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1028072295/34.

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17

Vianna, Murilo dos Santos. "Functional, structural and agrohydrological sugarcane crop modelling: towards a simulation platform for Brazilian farming systems." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/11/11152/tde-01082018-150704/.

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Sugarcane crop is the main source of sugar and the second largest source of biofuel in the world. Since the 1980s, Brazil has been the largest sugarcane producing nation, producing half of the global amount. Ethanol and biomass from sugarcane account for more than 15% of the country´s energy source. Nevertheless, commercial Brazilian sugarcane yield has plateaued at 75 t ha-1, and to meet the increasing demand for sugar and ethanol, the crop has strongly expanded towards central-western regions, where irrigation is mandatory to offset water stress risks. To support decision making and scientific guidance towards where and how the crop should expand and/or to increase yields, a heuristic view of the crop system is needed, which can mathematically be translated into a crop model. In turn, the effects of crop management, land use change, climate variability and agro-economic change factors on crop production and associated quantities can and have been assessed by using crop process-based models (PBM). In contrast to other crops, however, sugarcane has only two PBMs available for end users (DSSAT-CANEGRO and APSIM-Sugar), and further modifications of these models are required to better assess and support sustainable sugarcane production in Brazil. Therefore, this study aimed to develop, calibrate and evaluate different crop modelling approaches for Brazilian sugarcane farming systems, water management strategies, climate change impacts and canopy structures to support improved decisions for private and public stakeholders in the sugarcane sector, provide scientific guidance and establish a Brazilian platform of crop simulations. A new version of the sugarcane process-based model (SAMUCA) was developed to operate at phytomer level, focusing on soil mulch effects on crop growth and development, tillering process under competition for light and sucrose accumulation based on source-sink relations. The model was embedded into a modular platform dedicated to simulating the soil-plant-atmosphere and the management of the sugarcane farm system. The previous version of SAMUCA was also re-structured and coupled to the SWAP (Soil, Water, Atmosphere and Plant) agrohydrological model platform, focusing on soil water relations to crop growth. Moreover, a Functional-Structural Plant Model (FSPM) for sugarcane was developed by integrating the main crop components at the organ level (phytomer), based on a relative source-sink approach and a robust light model embedded into a three-dimensional modelling platform (GroIMP). All approaches were evaluated, and the performance under experimental conditions for different Brazilian conditions was determined. The performance of the new version of SAMUCA in a long-term experiment and under different Brazilian conditions was satisfactory, with agreement indices close to those of other widely used sugarcane crop models (CANEGRO and APSIM-Sugar). In addition, the modulated crop simulation platform can be used to host more crop models and integrate new features of Brazilian farming systems. The coupling of the SWAP-SAMUCA model was accomplished, and although non-expressive improvements in model performance regarding crop yield were noticed (with an overall 6% lower RMSE), the ability of SWAP-SAMUCA to simulate soil water content was higher than that of the original \"tipping bucket\" approach (32% lower RMSE). The Functional-Structural Plant Model for sugarcane was able to satisfactorily simulate canopy development, tillering and sucrose accumulation at the organ level and its integration at the whole-plant level. Besides its ability to simulate competition for light, helping to understand intra-specific competition among tillers, the sugarcane FSPM framework can be used to support sucrose accumulation and translocation mechanism studies as well as intercropping studies for sugarcane, which has already successfully been done for other crops.
A cultura da cana-de-açúcar é a principal fonte de açúcar e a segunda maior fonte de biocombustíveis do mundo. O Brasil é o maior produtor mundial desde a década de 80 e atualmente representa metade da produção mundial, enquanto que ao mesmo tempo o etanol e a biomassa correspondem a mais de 15% da fonte de energia do país. Contudo, a produtividade comercial da cana-de-açúcar brasileira atingiu um limiar de cerca de 75 t ha-1 e para atender à crescente demanda de açúcar e etanol, a cultura expandiu-se fortemente para a região centro-oeste, onde a irrigação é obrigatória para manter os níveis de produção e diminuir riscos de quebra de safra. Para dar suporte a tomada de decisão e avanço científico sobre onde e como a cultura deve se expandir e/ou aumentar a produtividade, é necessária uma visão heurística do sistema agrícola brasileiro que pode ser traduzida matematicamente para um modelo de cultura. Desta forma, os efeitos do manejo e tipo de solo, variabilidade climática e fatores econômicos na produtividade de culturas agrícolas podem ser avaliados quantitativamente por meio de modelos de culturas baseados em processos (MBP). No entanto, em contraste a outras culturas, a cana-de-açúcar possui apenas dois MBPs disponíveis para usuários finais (DSSAT-CANEGRO e APSIM-Sugar) que requerem calibração e parametrização para melhor representar o sistema agrícola de cana-de-açúcar do Brasil. Portanto, este estudo teve como objetivo desenvolver, calibrar e avaliar diferentes abordagens de modelagem de culturas voltadas a produção de cana-de-açúcar no Brasil, para servir como ferramenta de tomada de decisão para o setor público e privado, auxilio no manejo da água e avaliação dos impactos nas mudanças climáticas. Portanto, uma nova versão do modelo baseado em processo de cana-de-açúcar (SAMUCA) foi desenvolvida para operar a nível de fitômeros, incluindo os efeitos no crescimento e desenvolvimento da cana com base na cobertura da palha no solo, competição por luz no processo de perfilhamento e acúmulo de sacarose com base nas relações fonte-dreno. O modelo foi incorporado em uma plataforma modular dedicada a simular o sistema solo-planta-atmosfera e manejo do sistema agrícola. Além disso, a versão anterior do SAMUCA também foi reestruturada e acoplada à plataforma agro-hidrológica SWAP (\"Soil, Water, Atmosphere and Plant\") com objetivo de aprimorar as simulações de balanço hídrico no solo e efeito no crescimento da cana-de-açúcar. Por fim, um Modelo Funcional-Estrutural de Plantas (MFEP) para a cana-de-açúcar foi desenvolvido integrando os principais componentes da cultura a nível de órgãos (fitômeros) com base em uma abordagem de fonte-dreno e um modelo robusto de radiação que foram introduzidos em uma plataforma de modelagem tridimensional (GroIMP). As três abordagens foram avaliadas e seu desempenho foi determinado com base em condições experimentais para diferentes regiões brasileiras. O desempenho da nova versão do modelo SAMUCA em experimento de longo prazo e em diferentes condições brasileiras foi satisfatório e os índices de concordância foram próximos de outros modelos de cana-de-açúcar amplamente utilizados (CANEGRO e APSIM-Sugar). Além disso, a plataforma de simulação de culturas modulada pode ser usada para hospedar mais modelos de culturas e integrar novas características do sistema de cultivo brasileiro. O acoplamento do modelo SWAP-SAMUCA foi realizado e apesar não apresentar melhorias expressivas no desempenho do modelo em simular os componentes da cultura (com erro médio quadrático [RMSE] 6% menor), a habilidade do modelo SWAP-SAMUCA em simular o teor de água no solo mostrou-se consideravelmente superior em comparação ao modelo original (RMSE 32% menor). O MFEP para cana-de-açúcar foi capaz de simular o desenvolvimento do dossel, o processo de perfilhamento e o acúmulo de sacarose ao nível de órgãos e planta de forma satisfatória. Além de sua capacidade em simular com precisão a interceptação da radiação por cada estrutura do dossel, podendo auxiliar na compreensão do processo de competição intraespecífica entre perfilhos, a estrutura do MFEP da cana-de-açúcar também pode ser usada no apoio à pesquisa focando os mecanismos de acúmulo de sacarose e translocação de açúcares bem como em estudos de consórcio em cana-de-açúcar, como têm sido realizado com sucesso para outras culturas nos últimos anos.

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Barritt, Brian James. "The Modeling, Simulation, and Operational Control of Aerospace Communication Networks." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1499348546519051.

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19

Pei, Yuqing. "Computer simulation of fundamental processes in high voltage circuit breakers based on an automated modelling platform." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/2007107/.

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Auto-expansion circuit breakers utilize the arc’s energy to generate the flow conditions required for current interruption. The operation of this type of circuit breaker is extremely complex and its interruption capability depends on the whole arcing history as well as a number of geometric factors. On the other hand, circuit breaker development based on test is extremely expensive and time consuming. The accumulated understanding of the underlying physical processes so far enables arc models be used as a tool for optimum design of switchgear product such as high voltage circuit breakers. For academic research, there is often a need to study the performance of a newly developed arc model by inspecting the distribution of relevant physical quantities during a simulation and their sensitivity to model parameters in an efficient and convenient approach. However the effective use of computer simulation by design engineers has been hindered by the complexity encountered in model implementation. This thesis presents the development and structure of an automated simulation tool, the Integrated Simulation and Evaluation Environment (ISEE), for the arcing process in gas-blast circuit breakers. The functionalities of ISEE are identified and developed based on the experience in real product design, which include visual creation and definition of components, automatic setup of arc models based on a commercial CFD software package as equation solver, simulation task management, and visualization of computational results in “real-time” mode. This is the first automated simulation platform in the community of switching arc simulation. Using ISEE as the simulation tool, different designs of auto-expansion circuit breakers have been investigated to reveal the fundamental characteristics of the arcing process under different test duties. Before attempting to investigate the capability of an auto-expansion circuit breaker, the fundamental issue of determining the turbulence parameter of the Prandtl mixing length model is addressed. Previous studies on turbulence arcs were mostly concerned with simple converging-diverging nozzles. There has been little work on real circuit breaker nozzles. In order to calibrate the turbulence parameter, real arcing conditions including interrupting currents, contact travels, and transient recovery voltages of two commercial circuit breakers, with rated voltage of 145 kV and 245 kV, have been used together with the geometry of the circuit breakers to calibrate the range of the turbulence parameter. The effect of nozzle ablation has been considered. All together 6 cases have been used for three circuit breakers with each pair of cases corresponding to a success and failure in its thermal recovery process. It has been found that a single parameter of 0.35 is applicable to all three circuit breakers with an auxiliary nozzle and a main nozzle of converge-flat throat-diverge shape. It must be noted that this value is obtained with the definition of thermal radius introduced in Chapter 3 and the assumption that the parameter linearly changes with the interrupting current from 0.05 at 15 kA to 0.35 at current zero. Using the calibrated turbulence model, a computational study of the thermal interruption performance of a 145 kV, 60 Hz auto-expansion circuit breaker with different arc durations has been carried out in Chapter 4. The relation between pressure peak and current peak in the auto-expansion circuit breaker is discussed. It has been found that a larger average mass flux in the main nozzle indicates a better interruption environment, enabling the circuit breaker to withstand a larger rate of rise of recovery voltage after current zero. Another important finding is that the auxiliary nozzle plays an important role in an auto-expansion circuit breaker both at the high current phase and during the current zero period. Therefore, the proper design and use of an auxiliary nozzle is a key factor to enhance the thermal interruption capability of high voltage auto-expansion circuit breakers. In Chapter 5 of the thesis, the transient pressure variation in auto-expansion circuit breakers was studied. The pressure variation has an extremely complex pattern and the pressure changes in different ways depending on the location in the arcing chamber. It is shown, for the first time, that the time lag between the current peak and pressure peak in the expansion volume can be explained by using an energy flow rate balance method, that is flow reversal occurs when the enthalpy exhaustion rate from the contact space equals the electrical power input. Following the flow reversal, a high enthalpy flow rate from the expansion volume into the contact gap first occurs for a short while (1 ms), which is followed by a high mass flow rate of relatively cool gas at less than 2000 K. This high mass flow rate causes a surplus in mass flow rate into the contact gap and results in the last temporary pressure peak in the contact space before the pressure and flow field finally settle down for arc quenching at current zero. The pressure change under different conditions, i.e. different arc durations, different current levels and different length of the heating channel, has also been studied in details. In summary the present research leads to original findings in three aspects of the operation of auto-expansion circuit breakers, i.e. the calibration of the turbulence parameter for the Prandtl mixing length model, interruption performance with different arc durations, and the transient pressure variation in the arcing process. The results are expected to provide useful information for the optimum design of auto-expansion circuit breakers.

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20

Acevedo, Miguel. "FPGA-Based Hardware-In-the-Loop Co-Simulator Platform for SystemModeler." Thesis, Linköpings universitet, Datorteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-133413.

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This thesis proposes and implements a flexible platform to perform Hardware-In-the-Loop (HIL) co-simulation using a Field-Programmable-Gate-Array (FPGA). The HIL simulations are performed with SystemModeler working as a software simulator and the FPGA as the co-simulator platform for the digital hardware design. The work presented in this thesis consists of the creation of: A communication library in the host computer, a system in the FPGA that allows implementation of different digital designs with varying architectures, and an interface between the host computer and the FPGA to transmit the data. The efficiency of the proposed system is studied with the implementation of two common digital hardware designs, a PID controller and a filter. The results of the HIL simulations of those two hardware designs are used to verify the platform and measure the timing and area performance of the proposed HIL platform.

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Luddeni, Giovanni. "Improvement of a simulation platform for Helicon Plasma Thrusters: analysis of the boundary conditions and modelling of the sheath." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24296/.

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The proper treatment of the boundary conditions when dealing with fluid simulations of plasma processes constitutes a non-negligible issue that might affect the results, especially when dealing with plasma sources for propulsion applications, e.g., as in Helicon Plasma Thrusters (HPT). In this work, we handle the problem of boundary conditions modelling. Firstly, we have reviewed several established physical models to assess how to properly treat the HPTs. Then, three approaches to account for the sheath have been considered, namely, I) the direct solution of the sheath region through the finite volume discretization, II) the modelling of the sheath through analytical solutions, and III) a hybrid approach in which we coupled two distinguished solvers that handle respectively the bulk region of the plasma and the sheath. The bulk region solver is based on the classical multi-fluid approach. The sheath is solved either by a fluid or a Lagrangian approach, to account for deviations from the Maxwellian velocity distribution function for each species present in the plasma. The proposed approaches have been tested in terms of plasma profiles (e.g., density) against the experimental case of a Piglet reactor. Generally, all three approaches have given a satisfactory agreement with the experimental measurements. In particular, the first and third approaches have shown similar results, with the latter being assessed with the fluid approach only. As for the computational cost, both methods required similar computation time. Regarding the second approach, the results under-estimate the plasma density if compared to the other methods. Nonetheless, this approach required 97% less computational effort. Ultimately, the hybrid approach achieved good results and it offers interesting possibilities of further development, some of which have been discussed.

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Motamed, Dashliborun Amir. "Performance of multiphase packed-bed reactors and scrubbers on offshore floating platforms: hydrodynamics, chemical reaction, CFD modeling and simulation." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/30439.

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Les systèmes flottants de production, stockage et de déchargement (FPSO) ont été introduits dans les secteurs d'exploitation des hydrocarbures offshore en tant qu'outils facilement déplaçables pour l’exploitation de champs de pétrole et de gaz de petites ‘a moyenne tailles ou lorsque ceux-ci sont éloignés des côtes ou en eaux profondes. Ces systèmes sont de plus en plus envisagés pour les opérations de traitement et de raffinage des hydrocarbures à proximité des sites d'extraction des réservoirs sous-marins en utilisant des laveurs et des réacteurs à lit fixe embarqués. De nombreuses études dans la littérature pour découvrir l'hydrodynamique de l'écoulement polyphasiques dans des lits garnis ont révélé que la maîtrise de tels réacteurs continue d’être un défi quant à leur conception /mise à l'échelle ou à leur fonctionnement. De plus, lorsque de tels réacteurs sont soumis à des conditions fluctuantes propres au contexte marin, l'interaction des phases devient encore plus complexe, ce qui entraîne encore plus de défis dans leur conception. Les travaux de recherche proposés visent à fournir des informations cruciales sur les performances des réacteurs à lit fixes à deux phases dans le cadre d'applications industrielles flottantes. Pour atteindre cet objectif, un simulateur de mouvement de navire de type hexapode avec des mouvements à six degrés de liberté a été utilisé pour simuler les mouvements des FPSO tandis que des capteurs à maillage capacitif (WMS) et un tomographe à capacitance électrique (ECT) couplés avec le lit garni ont permis de suivre en ligne les caractéristiques dynamiques locales des écoulements diphasiques. L'effet des inclinaisons et des oscillations de la colonne sur le comportement hydrodynamique des lits garnis biphasiques a été étudié, puis les résultats ont été comparés à leurs analogues terrestres correspondants (colonne verticale immobile). De plus, des stratégies opérationnelles potentielles ont été proposées pour atténuer la maldistribution des fluides résultant des oscillations du lit ainsi que pour intensifier le processus de réactions dans les réacteurs à lit fixe. Parallèlement aux études expérimentales, un modèle Eulérien CFD transitoire 3D a été développé pour simuler le comportement hydrodynamique de lits garnis polyphasiques sous des inclinaisons et des oscillations de colonnes. Enfin, pour compléter le travail expérimental, une étude systématique a été réalisée pour étudier les performances de capture de CO2 à base d'amines d’un laveur à garnissage (en vrac et structuré) émulant une colonne à bord des ...
Floating production storage and offloading (FPSO) systems have been introduced to offshore hydrocarbon exploitation sectors as readily movable tools for development of small or remote oil and gas fields in deeper water. These systems are increasingly contemplated for onboard treatment and refining operations of hydrocarbons extracted from undersea reservoirs near extraction sites using embarked packed-bed scrubbers and reactors. Numerous efforts in the literature to uncover the hydrodynamics of multiphase flow in packed beds have disclosed that such reactors continue to challenge us either in their design/scale-up or their operation. Furthermore, when such reactors are subjected to marine conditions, the interaction of phases becomes even more complex, resulting in further challenges for design and scale-up. The proposed research aims at providing important insights into the performance of two-phase flow packed-bed reactors in the context of floating industrial applications. To achieve this aim, a hexapod ship motion simulator with six-degree-of-freedom motions was employed to emulate FPSO movements while capacitance wire mesh sensors (WMS) and electrical capacitance tomography (ECT) coupled with the packed bed scrutinized on-line and locally the two-phase flow dynamic features. The effect of column tilts and oscillations on the hydrodynamic behavior of multiphase packed beds was investigated and then the results were compared with their corresponding onshore analogs. Moreover, potential operational strategies were proposed to diminish fluid maldistribution resulting from bed oscillations as well as for process intensification of heterogeneous catalytic reactions in packed-bed reactors. In parallel with the experiment studies, a 3D transient Eulerian CFD model was developed to simulate the hydrodynamic behavior of multiphase packed beds under column tilts and oscillations. Ultimately, a systematic experimental study was performed to address the amine-based CO2 capture performance of packed-bed scrubbers on board offshore floating vessels/platforms. Apart from gaining a comprehensive knowledge on the influence of translational and rotational movements on multiphase flows in porous media, oil and gas sectors and ship industry would benefit from the results of this work for design and scale-up of industrial reactors and scrubbers.
Unité flottante de production, de stockage et de déchargement

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23

Pant, Gaurav. "Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17223.

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Frazer, Miles. "Advances in understanding the evolution of diagenesis in Carboniferous carbonate platforms : insights from simulations of palaeohydrology, geochemistry, and stratigraphic development." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/advances-in-understanding-the-evolution-of-diagenesis-in-carboniferous-carbonate-platforms-insights-from-simulations-of-palaeohydrology-geochemistry-and-stratigraphic-development(9a1caa9d-6f16-472a-8b38-42aca657a9b9).html.

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Carbonate diagenesis encapsulates a wide range of water rock interactions that can occur within many environments and act to modify rock properties such as porosity, permeability, and mineralogical composition. These rock modification processes occur by the supply of reactant-laden fluids to areas where geochemical reactions are thermodynamically and kinetically favoured. As such, understanding the development of diagenesis requires an understanding of both palaeohydrology and geochemistry, both of which have their own complexities. However, within geological systems, both the conditions that control fluid migration and the distribution of thermodynamic conditions can change through time in response to external factors. Furthermore, they are often coupled, with rock modification exercising a control on fluid flow by altering the permeability of sediments. Numerical methods allow the coupling of multiple complex processes within a single mathematical formulation. As such, they are well suited to investigations into carbonate diagenesis, where multiple component subsystems interact. This thesis details the application of four separate types of numerical forward modelling to investigations of diagenesis within two Carboniferous carbonate platforms, the Derbyshire Platform (Northern England) and the Tengiz Platform (Western Kazakhstan). Investigations of Derbyshire Platform diagenesis are primarily concerned with explaining the presence of Pb-mineralisation and dolomitisation observed within the Dinantian carbonate succession. A coupled palaeohydrology and basin-development simulation and a series of geochemical simulations was used to investigate the potential for these products to form as a result of basin-derived fluids being driven into the platform by compaction. The results of these models suggest that this mechanism is appropriate for explaining Pb-mineralisation, but dolomitisation requires Mg concentrations within the basin-derived fluids that cannot be attained. Geothermal convection of seawater was thus proposed as an alternative hypothesis to explain the development of dolomitisation. This was tested using an advanced reactive transport model, capable of considering both platform growth and dolomitisation. The results of this suggests that significant dolomitisation may have occurred earlier on in the life of the Derbyshire Platform than has previously been recognised. An updated framework for the development of diagenesis in the Derbyshire Platform is proposed to incorporate these new insights. The Tengiz platform forms an important carbonate oil reservoir at the northeastern shore of the Caspian Sea. The effective exploitation of any reservoir lies in an understanding of its internal distributions of porosity and permeability. Within carbonate systems, this is critically controlled by the distribution of diagenetic products. A model of carbonate sedimentation and meteoric diagenesis is used to produce a framework of early diagenesis within a sequence stratigraphic context. The studies mentioned above provide a broad overview of the capabilities and applicability of forward numerical models to two data-limited systems. They reveal the potential for these methods to guide the ongoing assessment and development of our understanding of diagenetic systems and also help identify key questions for the progression of our understanding in the future.

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Caron, Eddy. "Contribution to the management of large scale platforms: the Diet experience." Habilitation à diriger des recherches, Ecole normale supérieure de lyon - ENS LYON, 2010. http://tel.archives-ouvertes.fr/tel-00629060.

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10 ans. 10 ans de recherches autour du calcul haute performance dans des environnements distribués. Et tout au long de ces années, le développement d'un intergiciel appelé DIET comme liant de ces recherches. Aujourd'hui la naissance d'une start'up autour de DIET, offre à cet intergiciel une autre vie. Ce tournant me donne alors l'occasion de proposer une vision que j'espère complète de cette aventure. A travers l'expérience de DIET, il sera intéressant d'évoquer les problèmes de recherche inhérents au développement complet d'un intergiciel de grille et de Cloud pour le calcul haute performance. Les aspects d'interoperabilités seront tout d'abord évoqués au travers des efforts de standardisation du GridRPC, et nous verrons comment DIET répond au problème de la localisation de ressources. Le problème de l'extensibilité sera ensuite traité au travers de l'architecture proposée. Nous verrons ensuite la réponse faite pour la découverte de services qui partant d'un besoin de notre intergiciel débouchera sur une solution générique. Ces premiers travaux évoqués se focalise côté client. Côté serveur nous évoquerons la solution mise en place pour la gestion des ressources. L'étape suivante sera de s'intéresser au déploiement et à la planification de ce déploiement. Conformément à notre objectif initial de fournir un outil complet, nous aborderons ensuite les problèmes liés à la gestion de données. Nous mettrons ensuite en lumière un des points forts de DIET qui est la réponse de ce dernier aux problèmes d'ordonnancement sur des environnements hétérogènes. Ce qui nous conduira jusqu'à la gestion des workflows dans notre intergiciel. Enfin pour conclure je vous présenterai différents cas d'utilisation de DIET sur des applications réelles et variées dont la plateforme du projet Décrypthon qui utilise notre intergiciel dans un cadre de production.

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Palma, Lázgare Israel Romualdo. "Contributions to channel modelling and performance estimation of HAPS-based communication systems regarding IEEE Std 802.16TM." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/48630.

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New and future telecommunication networks are and will be broadband type. The existing terrestrial and space radio communication infrastructures might be supplemented by new wireless networks that make and will make use of aeronautics-technology. Our study/contribution is referring to radio communications based on radio stations aboard a stratospheric platform named, by ITU-R, HAPS (High Altitude Platform Station). These new networks have been proposed as an alternative technology within the ITU framework to provide various narrow/broadband communication services. With the possibility of having a payload for Telecommunications in an aircraft or a balloon (HAPS), it can be carried out radio communications to provide backbone connections on ground and to access to broadband points for ground terminals. The latest implies a complex radio network planning. Therefore, the radio coverage analysis at outdoors and indoors becomes an important issue on the design of new radio systems. In this doctoral thesis, the contribution is related to the HAPS application for terrestrial fixed broadband communications. HAPS was hypothesised as a quasi-static platform with height above ground at the so-called stratospheric layer. Latter contribution was fulfilled by approaching via simulations the outdoor-indoor coverage with a simple efficient computational model at downlink mode. This work was assessing the ITU-R recommendations at bands recognised for the HAPS-based networks. It was contemplated the possibility of operating around 2 GHz (1820 MHz, specifically) because this band is recognised as an alternative for HAPS networks that can provide IMT-2000 and IMT-Advanced services. The global broadband radio communication model was composed of three parts: transmitter, channel, and receiver. The transmitter and receiver parts were based on the specifications of the IEEE Std 802.16TM-2009 (with its respective digital transmission techniques for a robust-reliable link), and the channel was subjected to the analysis of radio modelling at the level of HAPS and terrestrial (outdoors plus indoors) parts. For the channel modelling was used the two-state characterisation (physical situations associated with the transmitted/received signals), the state-oriented channel modelling. One of the channel-state contemplated the environmental transmission situation defined by a direct path between transmitter and receiver, and the remaining one regarded the conditions of shadowing. These states were dependent on the elevation angle related to the ray-tracing analysis: within the propagation environment, it was considered that a representative portion of the total energy of the signal was received by a direct or diffracted wave, and the remaining power signal was coming by a specular wave, to last-mentioned waves (rays) were added the scattered and random rays that constituted the diffuse wave. At indoors case, the variations of the transmitted signal were also considering the following matters additionally: the building penetration, construction material, angle of incidence, floor height, position of terminal in the room, and indoor fading; also, these indoors radiocommunications presented different type of paths to reach the receiver: obscured LOS, no LOS (NLOS), and hard NLOS. The evaluation of the feasible performance for the HAPS-to-ground terminal was accomplished by means of thorough simulations. The outcomes of the experiment were presented in terms of BER vs. Eb/N0 plotting, getting significant positive conclusions for these kind of system as access network technology based on HAPS.

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Houda, Taha. "Human Interaction in a large workspace parallel robot platform with a virtual environment." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG047.

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L'objectif de la thèse porte sur la définition, la mise oeuvre et l'évaluation d'un algorithme de restitution de mouvement prenant en compte les contraintes de perception du système vestibulaire chez l'humain et les contraintes liées à la physique du simulateur de mouvement utilisé. Ce dernier est constitué par une plateforme robotique série-parallèle à 8 degrés de liberté entièrement conçue dans le laboratoire et destinée principalement à l'assistance aux personnes présentant un handicap moteur. Cette restitution sensorielle nécessite des travaux de recherches pluridisciplinaires en robotique et en réalité virtuelle. Aussi, une formalisation de la modélisation dynamique, basée sur l'état de l'art, a été adaptée et les paramètres dynamiques optimisés et identifés à la plateforme de mouvement à 8 degrés de libertés. Plusieurs méthodes de génération de mouvement, gérant la redondance de la plateforme, ont été étudiées mises en oeuvre et comparées. La méthode basée sur l'optimisation par essaims particulaires (PSO) plus performante a été retenue. Cet algorithme est par la suite utilisé pour optimiser les paramètres du contrôleur de la plateforme par mode glissant.Le simulateur a été utilisé pour une application de ski en réalité virtuelle reproduisant la station de Combloux en Haute-Savoie dédiée aux personnes handicapées. Les résultats de simulation montrent un très bon suivi des consignes et une bonne réduction des oscillations. Ces travaux seront poursuivis par l'utilisation d'interfaces multi sensorielles de réalité virtuelle d'assistance à l'humain
The thesis objective relates to the denition, the implementation and the evaluation of a Motion Cueing Algorithm taking into account the perceptual constraints of the vestibular systemin humans and the constraints related to the movement physics of the used simulator. The latter consists of a series-parallel robotic platform with 8 degrees of freedom, entirely designed in the laboratory and intended primarily to assist people with motor disabilities. This sensory restitution requires multidisciplinary research work in robotics and virtual reality. Moreover, a formalization of dynamic modeling, based on the state of the art, was adapted and the dynamic parameters optimized and identied for the 8 degrees of freedom motion platform. Several methods of trajectory generation, exploitation of the platform redundancy, have been studied, implemented,and compared. The most e cient particle swarm optimization (PSO) method was chosen. This algorithm is then used to optimize the parameters of the platform controller in sliding mode. The simulator was used for a virtual reality ski application reproducing the Combloux resort in Haute-Savoie dedicated to disabled people. The simulation results show a very good trajectory tracking behavior and a good reduction in terms of oscillations. This work will be continued through the use of multi-sensory human-assisted virtual reality interfaces

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Gallab, Maryam. "Développement d’une approche d’aide à la maitrise des risques dans les activités de maintenance d'une chaine logistique : Approche par modélisation et simulation basée sur les systèmes multi-agents." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM028/document.

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Cette thèse a pour objectif principal de développer un simulateur multi-agents pour concevoir un système d'aide à la maitrise des risques des activités de maintenance. Le but est d'explorer la complexité de la maintenance et de spécifier les interactions entre la fonction maintenance, l'analyse et l'évaluation des risques. Nous nous intéressons d’une part, à concevoir un modèle systémique permettant d’identifier et de modéliser un système industriel, à montrer les différentes interactions entre ses éléments, à analyser et évaluer les risques des activités de maintenance. Nous proposons la méthode MOSAR et le langage UML pour concevoir un modèle cognitif de référence. Ce modèle a servi de point de départ pour la conception d’une base de données à l’aide du langage SQL, qui est exploitée par le modèle Multi-Agents afin d’acquérir les informations nécessaires à son fonctionnement.D’autre part, nous développons une architecture d’un Système Multi-Agents qui a pour vocation d’anticiper les situations de défaillances et la prise de décisions à l’aide de la simulation du comportement du système étudié. Une comparaison entre les plateformes existantes dédiées aux Systèmes Multi-Agents est effectuée pour choisir la plateforme adéquate à notre problématique pour la réalisation de la simulation.Finalement, les modèles développés sont appliqués dans le cadre d’une chaîne logistique pour le chargement et le déchargement de GPL (Gaz de Pétrole Liquéfié). Un simulateur a été développé à l’aide de la plateforme AnyLogic dans le but d’étudier le comportement du système et de simuler les scénarios de défaillances choisis par l’industriel pour le calcul de la criticité à partir de trois paramètres (fréquence, gravité, détectabilité) et l’obtention d’un Tableau de Bord contenant un ensemble d’indicateurs de performance de la maintenance. Les modèles de simulation proposés permettent d’orienter les industries vers les bonnes décisions pour éviter les situations à risques pouvant déclencher des événements perturbateurs dommageables
The main objective of this thesis is to develop a multi-agent approach to designing a model to overcome risks of maintenance activities. The aim is to explore the maintenance complexity and to indicate the interactions between the maintenance function and the risk assessment.Firstly, we are interested in designing a systemic model to identify and model the industrial system, to show the different interactions between its elements, to analyze and to evaluate risks of maintenance activities. We propose the MOSAR method and the UML language to design a cognitive reference model. This model served as a starting point for designing a database using the SQL language, which is operated by Multi-Agent model to acquire the necessary information for its operation.On the other hand, we develop a framework of a multi-agent system that aims to anticipate failures scenarios and the decision-making by simulating the studied system behaviour. A comparison between the existing platforms dedicated to Multi-Agent Systems is performed to choose the appropriate platform for the simulation.Finally, the developed models are applied in the LPG supply chain (Liquefied Petroleum Gas). A simulator was developed using the AnyLogic platform in order to study the system behaviour and to simulate the failure scenarios chosen by the industry, for the calculation of the criticality from three parameters (Frequency, severity, detectability), and for obtaining a Dashboard containing a set of maintenance performance indicators. The proposed simulation models help to guide the industries toward good decisions to avoid risky situations that may trigger disruptive events damaging

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Tendil, Anthony. "Contrôles tectoniques, climatiques et paléogéographiques sur l'architecture stratigraphique de la plateforme carbonatée urgonienne provençale (France) : approches sédimentologiques, géochimiques et numériques intégrées." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0230.

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Les systèmes carbonatés, anciens et actuels, se retrouvent au coeur d’enjeux économiques et sociétaux majeurs, notamment dans le domaine énergétique où ils représentent une part considérable des réserves prouvées de gaz et de pétrole. La présente thèse se focalise sur la plate-forme urgonienne Provençale (Barrémien supérieur–Aptien inférieur), analogue d’affleurement prouvé de réservoirs carbonatés du Moyen-Orient. Près d’une trentaine de coupes stratigraphiques, incluant notamment deux forages réalisés dans le cadre de ce travail, ont été considérées sur l’ensemble du domaine Provençal. La reconnaissance de surfaces d’émersion et d’ennoiement contraintes biostratigraphiquement permet d’appréhender régionalement l’évolution paléogéographique et l’architecture stratigraphique. Plusieurs phases de progradation en direction des bassins adjacents, entrecoupées d’épisodes de perturbation de la production carbonatée, sont identifiées en Provence. Un scénario stratigraphique comparable est proposé pour les plates-formes urgoniennes du Pourtour Vocontien. En Provence, la compartimentation réservoir de la plate-forme urgonienne est principalement contrôlée par le contexte séquentiel des dépôts qui induit une dualité entre des carbonates cimentés précocement et ceux préservant un certain espace poreux. Les règles géologiques définies dans cette étude 1) servent à la réalisation d’un modèle numérique 3-D destiné aux simulations des écoulements à l’échelle de l’aquifère karstique de Fontaine-de-Vaucluse, dont le débit à l’exutoire est classé au cinquième rang mondial, et 2) aident à la prédiction des hétérogénéités sédimentaires et pétrophysiques des systèmes carbonatés
The analysis of carbonate systems is at the heart of major economic and societal challenges, especially in the energy field since they represent significant oil and gas reserves. The present thesis focuses on the Urgonian Provence platform (upper Barremian–lower Aptian interval) which is considered as a valid outcrop analogue of middle East carbonate reservoirs. About thirty stratigraphic sections, including newly acquired cores, are considered throughout the Provence domain. The recognition of biostratigraphically constrained exposure and drowning surfaces enables us to restore the regional palaeogeographic evolution along with the stratigraphic architecture. Several phases of platform progradation toward the adjacent basins, interrupted by episodes of changes in carbonate production, are identified in Provence. A comparable stratigraphic scenario is proposed for the peri-Vocontian Urgonian platforms. In Provence, the reservoir compartmentalisation of the Urgonian platform is mainly controlled by the sequence stratigraphic context that induced a distinction between early cemented carbonates and those preserving part of their original porosity. The geological rules provided in this study 1) are implemented into a 3-D numerical model intended for fluid-flow simulations at the scale of the Fontaine-de-Vaucluse karstic aquifer, whose karst spring is the fifth largest in the world, and 2) help in predicting the sedimentary and petrophysical heterogeneities of carbonate systems

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30

Le, Goïc Maëva. "Etude du contrôle postural chez l'homme : analyse des facteurs neurophysiologiques, biomécaniques et cognitifs, impliqués dans les 500 premières millisecondes d'une chute." Phd thesis, Université René Descartes - Paris V, 2013. http://tel.archives-ouvertes.fr/tel-01002633.

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La chute chez les seniors constitue un problème de santé publique. Citée comme la seconde cause de décès accidentel dans le monde, elle concerne un tiers des Français de plus de 65 ans. Les séquelles physiques et fonctionnelles qui en résultent, les conséquences psychosociales nuisibles pour la qualité de la vie, la perte d'autonomie et son coût de prise en charge justifient l'attention qui lui est actuellement portée. Du point de vue du chercheur, les interprétations sous-jacentes à la surexposition des personnes âgées au risque de chute restent controversées, notamment parce que la compréhension de la coordination dynamique corporelle et de l'implication corticale lors du contrôle de l'équilibre est encore limitée. L'étude de la chute et des mécanismes qui y conduisent présente donc un double intérêt, fondamental et sociétal. Une chute survient si deux conditions sont réunies. La première est la perte initiale de l'équilibre, un 'pré-requis' qui peut toucher la population entière dans son quotidien. La seconde est un échec des mécanismes de rééquilibration, c'est à dire de la stratégie de réponse mise en œuvre pour compenser la déstabilisation : comment s'opère la sélection d'une stratégie de rattrapage, à partir de quelle appréciation du contexte et des informations sensorielles disponibles est-elle choisie ? qu'est ce qui assure son opérationnalité et garantit le rattrapage ou signe au contraire son échec ?...Pour répondre à ces questions, nous nous sommes donc intéressés à ce moment critique où il est encore possible de modifier l'issue finale par des ajustements posturaux et des actions motrices rapides et adéquats chez une population de jeunes adultes. La première étude est une analyse globale de la phase précoce d'une chute -abrégée par un harnais- (soit quelques centaines de millisecondes après la perturbation), afin d'évaluer la capacité du sujet à réagir à une perturbation imprévue et de développer des stratégies garantissant une protection efficace. Cette première étape se propose d'identifier les indicateurs discriminants et prédictifs d'une chute et d'un rattrapage au niveau neurophysiologique et biomécanique. Cette étude a également permis de mettre en évidence la présence d'un délai temporel incompressible appelé " phase passive ", source de contraintes spatio-temporelles à l'expression complète d'une réponse posturale adaptée. Dans la seconde étude, de modélisation, nous avons élaboré un modèle mécanique personnalisé, construit à partir de radiographies tridimensionnelles non invasives du corps entier. Cette modélisation nous a permis d'analyser la contribution relative de propriétés biomécaniques passives et des synergies musculaires actives en jeu pendant les perturbations récupérables de l'équilibre ou non en comparant les résultats expérimentaux ('réels') obtenus à l'aide d'un dispositif asservi pour provoquer des chutes de plain-pied et la réponse théorique prédite ('simulée') à l'aide du modèle. Les résultats obtenus permettent de confirmer que le comportement du corps est en phase précoce-dicté par ses propriétés mécaniques, et peut être assimilé à un modèle simplifié. Après avoir mis en évidence l'existence d'une phase inertielle d'une durée équivalente à la moitié du temps disponible avant l'impact, notre questionnement s'est orienté vers le traitement de l'information en-cours lors de cette phase afin d'évaluer la contribution corticale alors que la réponse posturale évolue. La troisième étude consiste principalement à appréhender la charge cognitive impliquée dans le contrôle sensori-moteur, en particulier lors d'une chute, à l'aide du paradigme de double-tâche. En conclusion, à travers une approche pluridisciplinaire, les résultats obtenus dans cette thèse permettent d'émettre des recommandations intéressantes pour une prévention et une rééducation adaptée dans le but de contribuer à l'amélioration de la qualité de vie des personnes âgées.

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31

Li, Daming. "Modeling, simulation, and control of a Stewart platform." Thesis, 1996. http://hdl.handle.net/2429/5959.

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This thesis describes the modeling, simulation, and control of an inverted, ceiling-mounted Stewart platform, which is designed to be a motion simulator. This hydraulically actuated Stewart platform is capable of providing 10 m/s2, 400 degree/s2 accelerations and 1 m/s, 30 degree/s speeds to a 250 kg payload. The issues of modeling and control of such a platform are addressed here. The inverse kinematics and forward kinematics are studied first. The platform rigid-body dynamics are derived based on the virtual work principle and then combined with the actuator dynamics to simulate the response of the Stewart platform given a pre-planned motion path. Design and implementation of the link-space controller are discussed and also validated using experimental data. Cartesian-space controllers are also addressed. Motion drive algorithms are finally addressed to complete the system's function as a motion simulator. When the controller is well tuned, the bandwidth of the system can reach about 9Hz along the vertical axis for a payload of about 140 kg.

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32

Su, Po-Yuan, and 蘇柏元. "A Mulit-Granular Environment-Modeling Simulation Platform for IoT End Devices." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4te2ec.

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碩士
國立清華大學
資訊工程學系所
105
The development of Internet of Things (IoT) systems becomes difficult and time consuming. IoT simulation is desirable to provide a way to evaluate the system to save time and money. Current simulation tools only focus on the functional correctness but lack of execution information for design optimization. Particularly, it needs to identify the functions/objects in the original program that contain the executed instructions, which is essential in identifying bottlenecks. However, addition of the profiling ability slows down the simulation speed, it needs to support multiple simulation granularity at the functions/objects level to trade off simulation fidelity with simulation time. Furthermore, those tools also lack of supports for interactions with the environment. It needs to add environmental models in terms of time and location to dynamically inject environmental data to the simulated IoT devices. In this thesis, we present a multi-granular environment-modeling simulation platform for IoT end devices. We propose a source level profiling mechanism to allow generation of trace of executed instructions and link each executed instruction to the source level function. Our work is configurable to allow change of simulation granularity at the function level dynamically and support environmental modeling with external inputs to influence IoT simulation for the IoT end devices.

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33

Chyn, Yang Meng, and 楊孟秦. "A Methodology for Business Process Modeling and Simulation - Based on the Platform of Swarm." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/30849230658982242468.

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碩士
國立中山大學
資訊管理研究所
86
For improving business process modeling and analysis, we propose a modeling methodology, called Multi-Agent Modeling Method (MAMM). This modeling method covers the scope of process modeling and business process simulation. The main features of the MAMM consist of (1) representing a business in separation of concerns and multiple layers of abstraction, (2) eliminating the barriers between process representation and model analysis, (3) embedding verification and validation into the model, and (4) providing the modeling procedure for process modeling and simulation. We choose Swarm system as our simulation platform, and design the specific steps mapping the model to Swarm architecture in order to reduce the efforts of developing simulation system. We use a major manufacturer as an example to illustrate our proposed methodology.

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Andersen, Kevin. "Development of a time-domain modeling platform for hybrid marine propulsion systems." Thesis, 2016. http://hdl.handle.net/1828/7245.

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This thesis develops a time-domain integrated modeling approach for design of hybrid-electric marine propulsion systems that enables co-simulation of powertrain dynamics along with ship hydrodynamics. This work illustrates the model-based design and analysis methodology by performing a case study for an EV conversion of a short-cross ferry using the BC Ferries’ M.V. Klitsa. A data acquisition study was performed to establish the typical mission cycle of the ship for its crossing route between Brentwood Bay and Mill Bay, across the Saanich Inlet near Victoria, BC Canada. The data provided by the data acquisition study serves as the primary means of validation for the model’s ability to accurately predict powertrain loads over the vessel’s standard crossing. This functionality enables model-based powertrain and propulsion system design optimization through simulation to intelligently deploy hybrid-electric propulsion architectures. The ship dynamics model is developed using a Newton-Euler approach which incorporates hydrodynamic coefficient data produced by potential flow solvers. The radiation forces resulting from vessel motion are fit to continuous time-domain transfer functions for computational efficiency. The ship resistance drag matrix is parameterized using results from uRANS CFD studies that span the operating range of the vessel. A model of the existing well-mounted azimuthing propeller is developed to predict thrust production and mechanical torque for pseudo-second quadrant operation to represent all operating conditions seen in real operation. The propeller model is parameterized from the results of a series of uRANS CFD on the propeller geometry. A full battery-electric powertrain model is produced to study the accuracy of the model in predicting the drivetrain loads, as well as assessing the technological feasibility of an EV conversion for this particular vessel. A dual-polarization equivalent circuit model is created for a large-scale LTO battery pack. An average value model with MTPA control and dynamics loss model is developed for a commercially available electric drive system. Power loss models were developed for required converter topologies for computational efficiency. The model results for load prediction are compared to data acquired, and results indicate that the approach is effective for enabling the study of various powertrain architecture alternatives.
Graduate

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Razaghi, Parisa. "Dynamic time management for improved accuracy and speed in host-compiled multi-core platform models." Thesis, 2014. http://hdl.handle.net/2152/25049.

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With increasing complexity and software content, modern embedded platforms employ a heterogeneous mix of multi-core processors along with hardware accelerators in order to provide high performance in limited power budgets. Due to complex interactions and highly dynamic behavior, static analysis of real-time performance and other constraints is challenging. As an alternative, full-system simulations have been widely accepted by designers. With traditional approaches being either slow or inaccurate, so-called host-compiled simulators have recently emerged as a solution for rapid evaluation of complete systems at early design stages. In such approaches, a faster simulation is achieved by natively executing application code at the source level, abstracting execution behavior of target platforms, and thus increasing simulation granularity. However, most existing host-compiled simulators often focus on application behavior only while neglecting effects of hardware/software interactions and associated speed and accuracy tradeoffs in platform modeling. In this dissertation, we focus on host-compiled operating system (OS) and processor modeling techniques, and we introduce novel dynamic timing model management approaches that efficiently improve both accuracy and speed of such models via automatically calibrating the simulation granularity. The contributions of this dissertation are twofold: We first establish an infrastructure for efficient host-compiled multi-core platform simulation by developing (a) abstract models of both real-time OSs and processors that replicate timing-accurate hardware/software interactions and enable full-system co-simulation, and (b) quantitative and analytical studies of host-compiled simulation principles to analyze error bounds and investigate possible improvements. Building on this infrastructure, we further propose specific techniques for improving accuracy and speed tradeoffs in host-compiled simulation by developing (c) an automatic timing granularity adjustment technique based on dynamically observing system state to control the simulation, (d) an out-of-order cache hierarchy modeling approach to efficiently reorder memory access behavior in the presence of temporal decoupling, and (e) a synchronized timing model to align platform threads to run efficiently in parallel simulation. Results as applied to industrial-strength platforms confirm that by providing careful abstractions and dynamic timing management, our models can achieve full-system simulations at equivalent speeds of more than a thousand MIPS with less than 3% timing error. Coupled with the capability to easily adjust simulation parameters and configurations, this demonstrates the benefits of our platform models for early application development and exploration.
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36

Jia, Zile. "Building Integration Requirement and High Quality Simulation Development: Bring Simulation into Practice." Doctoral thesis, 2019. https://tud.qucosa.de/id/qucosa%3A36536.

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Abstract Most of the current building simulation tools are the results of funded projects for particular research purposes. Normally, these tools are developed in one research organization and utilized by the organization's own staff rather than by external personnel. Financially and intellectually, it is definitely a huge waste that designers and engineers rarely use those tools while they have to deal with increasingly complex issues and surely need the assistance of building simulation tools in building practice. Therefore, this thesis is dedicated to bringing building simulation closer to practice. The general goal is to promote the usage of simulation tools not only by simulation experts for research purposes but also by designers and engineers in practical work. Abstract Since the well-adopted tool could only be established based on appropriate requirements analysis, attention is firstly devoted to perceiving engineer or practice demands in building design and operation activities. Building multi-criteria analysis, whole life cycle integration, interdisciplinary interaction, control-wise integration/optimization together with the influence of “Industry 4.0” in building discipline are discussed in sequence. This is not only an enumeration of emerging scenarios, but also an exploration to figure out that integrated requirement is of growing significance as buildings are becoming increasingly advanced and complex. Abstract Multi-criteria simulation analysis indicates that designers and engineers need to consider, at least, energy efficiency and initial cost simultaneously; human comfort, environmental impact, life cycle cost are also involved; however, current workflow and cooperation mechanism among different simulation tools could not sufficiently fulfill multi-criteria analysis demand in building design and operation activities. Other detailed discussions on energy and cost integrated simulation, energy and human comfort integrated simulation, control related simulations all indicate one conclusion that building practice is increasingly integrated but simulation ability is still insufficient and isolated. Therefore, related tools must be coordinated and connected from the socio-technical point of view to support building practice eventually. Abstract Recent development in multi-domain modeling language Modelica and Functional Mock-up Interface (FMI) standard has provided an efficient solution for both integration and practical utilization. The ideology of the transfer layer is introduced; open-to-public and free usable framework and associated collaborative mechanisms are proposed. Individual models and tools could be integrated together through co-simulation or model exchange under FMI standard; along with complete and accurate database, the integrated tools could be validated and documented together, then transferred to commercial partners for further improvement, marketing and sale. In such way, a collaborative framework to transfer knowledge from research to practice could be formed in order to sufficiently process integrated requirement issues; the usage of research-oriented tools could be intensified in building industrial practice. Abstract Connection, interoperability, technical standard, and workflow protocol, those general terms for cooperative simulation development are further discussed. Cooperative Modelica library development is taken as an example to illustrate associated problems and their solutions from both detailed technical and generalized socio-technical perspectives. Abstract Individual model quality is a fundamental guarantee for successful cooperative simulation system. Therefore a model comparison project is carried out for quality assurance purpose. First, a series of comparison validation tests are established with a stepwise increased level of complexity. Then, multiple participants with a diversity of simulation tools contribute simulation models and results for listed validation scenarios. During the result comparison process, the deviation is detected, the bug is fixed, the model is improved; cooperative relationship and workflow standard are formed. Abstract In the last, a multi-criteria and interdisciplinary simulation case is conducted as a demonstrated example of actual integrated requirement along with integration and practical utilization effort of simulation. This case aims to select an appropriate energy solution for a building from four alternatives. Traditional HVAC equipment, renewable energy devices, storage facilities are applied and arranged in groups under Demand Side Management strategy and dynamic control. Financial and environmental impacts are also calculated along with the traditional result of annual energy consumption. Multiple Criteria Decision Analysis (MCDA) method is applied to analyze the four alternative energy solutions with an overall consideration of energy consumption, energy production, initial cost, life-cycle cost, and CO2 emission.:Chapter 1 Introduction Chapter 2 Integrated requirements in building practice Chapter 3 Isolated and insufficient building simulation tools Chapter 4 Practice oriented tool integration and improvement Chapter 5 Cooperative development in Modelica and Annex 60 Chapter 6 Model comparison cooperation Chapter 7 Conclusion and future work

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Grant, Michael. "New modelling and simulation methods to support clean marine propulsion." Thesis, 2021. http://hdl.handle.net/1828/13308.

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The marine industry has increased its adoption of pure-electric, diesel-electric, and other non-traditional propulsion architectures to reduce ship emissions and fuel consumption. While these technologies can improve performance, the design of a propulsion system becomes challenging, given that no single technology is superior across all vessel types. Furthermore, even identical ships with different operating patterns may be better suited to different propulsion technologies. Addressing this problem, previous research has shown that if key elements of a vessel's operational pro file are known, simulation and optimization techniques can be employed to evaluate multiple propulsion architectures and result in a better propulsion system design and energy management strategy for a given vessel. While these studies have demonstrated the performance improvements that can be achieved from optimizing clean marine propulsion systems, they rely on vessel operational profiles obtained through physical measurement from existing ships. From a practical point of view, the optimization of a vessel's propulsion system needs to occur prior to a vessel's construction and thus precludes physical measurement. To this end, this thesis introduces a marine simulation platform for producing vessel operational profiles which enable propulsion system optimization during the ship design process. Core subsystem modules are constructed for simulating ship motions in 3 degrees of freedom and result in operational profile time-series, including propulsion power. Data is acquired from a benchmark vessel to validate the simulation. Results show the proposed approach strikes a balance between speed, accuracy, and complexity compared with other available tools.
Graduate

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Kabunga, Selain Kasereka. "Towards hybrid stochastic modeling and simulation of complex systems in multi-scale environments with case studies on the spread of tuberculosis in Democratic Republic of the Congo." Thesis, 2020. http://hdl.handle.net/10500/26845.

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Abstract in English
Mathematical modeling of the spread of infectious diseases in a population has always been recognized as a powerful tool that can help decision-makers understand how a disease evolves over time. With the evolution of science and humanity, it has become evident that Mathematical models are too simplistic and have some limitations in modeling environmental phenomena, such as the spread of epidemics in a population, when they are applied without combining them with other sciences. In understanding the dynamics of epidemics in a population, the weakness of these models is their difficulty in grasping the complexity inherent in the spread of diseases in real life because, life is supported by human interactions and behaviors that are understood through networks of social and spatial interactions. Modeling the spread of epidemics which takes this reality into account requires the implementation of new tools to refine the results already obtained by mathematical models. The aim of this thesis is to explore and attempt to extend new developments in mathematical modeling of the spread of infectious diseases by proposing new tools based on mathematical models from differential equations and agent-based models from intelligent agents derived from artificial intelligence. To achieve this objective, the study starts from a comparative study of two ways of modeling and simulation of the spread of infectious diseases in the population, namely mathematical modeling and agent-based modeling with a concrete case study of the spread of tuberculosis based on data from the Democratic Republic of the Congo (DRC). Then comes a coupling study of these two approaches in a single model and its implementation in a multi-scale environment. The results show that the coupled model is more realistic compared to mathematical models generally implemented in the literature. Four case studies are presented in this thesis. Mathematical modeling based on differential equations is used in the first and second cases. The third case is based on intelligent agents model while the last one is based on the coupling of mathematical models and agent-based models. Application of implemented models to the spread of tuberculosis reveals that detection of people with latent tuberculosis and their treatment are among the actions to be taken into account in addition to those currently carried out by the Congolese health system. The models assert that the current TB situation in DRC remains endemic and that the necessary measures need to be taken to reduce the burden of TB, especially to control it, through the tuberculosis elimination strategy and its elimination in the future in accordance with the Sustainable Development Goals. Our hybrid model benefiting from the advantages of EBM and ABM confirms that taking the individual into account as a fully-fledged entity and managing their behavior gives the microscopic aspect of the model set up and brings it closer as much as possible to reality. Mathematical management of the spread of the disease in cities gives a macroscopic aspect to the model. Numerical simulations of this last model on a multi-scale virtual environment affirm that the mobility of individuals from city to city has a significant impact on the spread of tuberculosis in the population. Controlling the rate of population mobility from one city to another is one of the most important measures for large-scale disease control. This model therefore draws its richness from this dynamic at two different scales (two time scales modeling approaches: at the microscopic/individual level (ABM) and macroscopic/city level (ODE)), which gives the emergence of the model at the global level. As a result, it seems that the coupling of mathematical models to agent-based models should be applied when the dynamics of the complex system under consideration is at different scales. Based on our research results, it seems that the choice of an approach must depend on how the modeler would like to achieve the expected results. Mathematical models remain essential due to their analytical and synthetic aspect, but their coupling with intelligent agent-based models makes it possible to refine known results and thus reflect the reality of real life, because the resulting model integrate interactions of individuals and their heterogeneous behaviors that are necessary for understanding the spread of infectious diseases in the population that only mathematical models based on differential equations can not capture.
Mathematical Sciences
Ph D. (Applied Mathematics)

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Tang, W., A. S. Sagi, D. Green, and Tao Ruan Wan. "Cross-Platform Cloth Simulation API for Games." 2016. http://hdl.handle.net/10454/15325.

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no
Physics simulation is an active research topic in games, because without realistic physics, even the most beautiful game feels static and lifeless. Although cloth simulation is not new in computer graphics, high level of details of cloth in video games is rare and mostly coarse due to complex and nonlinear physical properties of cloth, which requires substantial computing power necessary to simulate it in real-time. This paper presents a robust and scalable real-time cloth simulation framework by exploring a variety of modern simulation techniques to produce realistic cloth simulation for games. The framework integrates with OpenCL GPGPU library to leverage parallelism. The final result is an API for games development with enriched interactive environments.

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Lai, Gilbert Ming Yeung. "Modelling and Control of Small-Scale Helicopter on a Test Platform." Thesis, 2008. http://hdl.handle.net/10012/3761.

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The helicopter is a Multiple-Input Multiple-Output (MIMO) system with highly coupled characteristics, which increases the complexity of the system dynamics. In addition, the system dynamics of the helicopter are unstable, referring to its tendency to deviate from an equilibrium when disturbed. Despite the complexity in its modelling and control, the benefit of using a helicopter for unmanned, autonomous applications can be tremendous. One particular application that motivates this research is the use of an unmanned small-scale helicopter in an autonomous survey mission over an area struck by disaster, such as an earthquake. The work presented in this thesis provides a framework for utilizing a platform system for research and development of small-scale helicopter systems. A platform system enables testing and analysis to be performed indoor in a controlled environment. This can provide a more convenient mean for helicopter research since the system is not affected by environmental elements, such as wind, rain or snow condition. However, the presence of the platform linkages poses challenges for analysis and controller design as it alters the helicopter system flight dynamics. Through a six degree-of-freedom (6 DOF) platform model derived in this research, the criteria for matching the trim conditions between the platform system and a stand alone helicopter have been identified. With the matched trim conditions, linearization is applied to perform analysis on the effects that the platform has on the system dynamics. The results of the analysis provide insights into both the limitations and benefits of utilizing the platform system for helicopter research. Finally, a Virtual Joint Control scheme is proposed as an unified control strategy for both the platform and the stand alone helicopter systems. Having a consistent control scheme between the two systems allows for comparisons between simulation and experimental results for the two systems to be made more readily. Furthermore, the Virtual Joint Control scheme represents a novel flight control strategy for stand alone helicopter systems.

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Motaung, Mokete Isaac. "Modelling and control of an electric wheelchair virtual reality platform." 2014. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001341.

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M. Tech. Electrical Engineering.
Discusses how to develop the kinematic and dynamic model and the controller for the 2-DOf motion platform used in an augmented reality environment for wheelchair driving. This comes as a motivation to help to train disabled and elderly people to drive wheelchairs.. With accurate inverse dynamic model, it is possible to achieve high performance control algorithms of robots and direct dynamic model is required for their simulation. The other part of this research was to model and control the roller for the feedback of the wheelchair wheels.

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Steyn, Nico. "Virtual reality platform modelling and design for versatile electric wheelchair simulation in an enabled environment." 2014. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001014.

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D. Tech. Electrical Engineering.
Developes a wheelchair motion platform whereby its user may be introduced into a simulated world. This simulated world is then required to be closely related to real world spaces that will be encountered by a disabled person using a wheelchair as a mobility aid. The wheelchair to be accommodated in the simulation environment may have multiple mechanical construct possibilities. The wheelchair used on the simulation platform needs to be driven by a combination of two wheels, as is generally found on manual and electric wheelchairs. The final objective was to design the simulation as closely as possible to the real world in order to use the VS-1 motion platform for architectural evaluations, possible training and general research in the field of simulators used in an enabled environment.

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Mughaid, Ala' Said Mohammad. "Modelling and simulation of a new cloud computing platform based on the SPEEDOS operating system." Thesis, 2018. http://hdl.handle.net/1959.13/1395111.

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Research Doctorate - Doctor of Philosophy (PhD)
Today’s society is data-driven. Collecting data from people, actions, algorithms and the web has resulted in large data stores, and accommodating all these data has become a major challenge. ‘Big data’ tends to grow exponentially each year [1]. To handle these increasing data sizes, the concepts of shared computing, shared memory, and remote storage and access to resources have been developed. Systems such as grid computing systems, where the infrastructure combines computer resources and storage from different locations to reach a common objective; utility computing systems, a business model in which computational resources and demand are packaged as a metered service similar to electricity and the public switched telephone network; and distributed systems, which consist of either physically distributed institutions or logically related projects/groups, are examples of such concepts. Cloud computing is a relatively recent abstraction, providing functionalities such as computation, and the sharing and storage of data for the users of computer networks. Cloud computing is attracting massive global investment [2] because of the services that it provides. However, security remains one of the top concerns for organisations and customers using cloud computing environments [3]. In fact, some security issues in cloud computing were inherited from previous computing systems, but the others were created because of its unique characteristics and architecture. Conventional security mechanisms are not sufficient to mitigate the threats in cloud systems, and new techniques are needed. This research presents a new platform for secure cloud computing. The platform allows cloud service providers to host their clients’ data in a secure environment and allows them to operate on the services in a secure manner for transactions. The platform was designed to make the operations relatively secure and safe using a robust structure by building a general software-structuring framework to implement the cloud software resources. The new platform provides new mechanisms that authorise only legitimate users to access data. The access to data is handled by a third-party service that checks on all of the requests by using the user’s ID and authentication/authorisation details. All of the users’ details and sensitive data are encrypted during transit and storage. The platform was implemented, evaluated and compared in terms of its effectiveness to the existing cloud platforms over a set of criteria. The results showed that this platform worked as expected and fairly quickly as compared to the other security platforms, and provided strong security against an intruder’s actions.

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Yue, Bonnie. "A Hardware-in-the-Loop Test Platform for Planetary Rovers." Thesis, 2011. http://hdl.handle.net/10012/6055.

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Hardware-in-the-Loop (HIL) test platform for planetary rovers was designed, fabricated and tested in the present work. The ability for planetary rover designers and mission planners to estimate the rover’s performance through software simulation is crucial. HIL testing can further the benefits of software simulations by allowing designers to incorporate hardware components within traditionally pure software simulations. This provides more accurate performance results without having access to all hardware components, as would be required for a full prototype testing. The test platform is designed with complete modularity such that different types of tests can be performed for varying types of planetary rovers and in different environments. For demonstrating the operation of the test platform, however, the power system operation of a solar powered rover was examined. The system consists of solar panels, a solar charge controller, a battery, a DC/DC converter, a DC motor and a flywheel. In addition, a lighting system was designed to simulate the solar radiation conditions solar panels would experience throughout a typical day. On the software side, a library of component models was developed within MapleSim and model parameters were tuned to match the hardware on the test bench. A program was developed for real-time simulations within Labview allowing communication between hardware components and software models. This program consists of all the component models, hardware controls and data acquisitioning. The GUI of this program allows users to select which component is to be tested and which component is to be simulated, change model parameters as well as see real time sensor measurements for each component. A signal scaling technique based on non-dimensionalization is also presented, which can be used in an HIL application for obtain scaling factors to ensure dynamic similarity between two systems. A demonstration of power estimation was performed using the pure software model simulations as well as the pure hardware testing. Hardware components were then added into the software simulation progressively with results showing better accuracy as hardware is added. The rover’s power flow was also estimated under different load conditions and seasonal variation. These simulations clearly demonstrate the effectiveness of an HIL platform for testing a rover’s hardware performance.

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Bujela, Buhle Wilfred. "Investigation into the robust modelling, control and simulation of a two-DOF gimbal platform for airborne applications." Thesis, 2014.

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The Council for Scienti c and Industrial Research's Sensor Science and Technology discipline has developed a multi-sensor camera (which consist of ultraviolet, infrared and visual lenses) capable of diagnosing HV/MV power transmission lines for hot/cold spots, corona e ects and visual defects of conductors, towers and pylons. This camera is planned to be mounted on a double-gimbal platform, which will be suspended on a rotary-unmanned aerial vehicle for the autonomous inspection of power transmission lines. The work presented in this dissertation focuses on the robust modelling and control of the gimbal assembly. The purpose of this is to ensure smooth and jitter-free motion of the gimbal against mechanical vibrations, sensor and actuator noise, and disturbances so that the images that are captured by the camera are not distorted. The work encompasses modelling the gimbal using the Lagrangian theory and applying Proportional Integral Derivative control,Ziegler-Nichols tuning and Integral Square Error, Integral Absolute Error, Integral Time Square Error, Integral Time Absolute Error tuning techniques, robust H1, Quantitative Feedback Theory and Model Reference Adaptive Control to stabilise the assembly against the aforementioned disturbances and parametric model uncertainty. The results obtained indicate favoritism towards the frequency domain robust control algorithms over the standard Proportional Integral Derivative controller, even when it is auto-tuned.

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Crépeau, Rousseau Ariane. "Développement et validation d'un modèle de simulation numérique personnalisé à une athlète de plongeon." Thèse, 2013. http://hdl.handle.net/1866/10402.

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Les entraîneurs en sports acrobatiques disposent de peu d’outils permettant d’améliorer leur compréhension des saltos vrillés et la performance des athlètes. L’objectif de ce mémoire était de développer un environnement graphique de simulation numérique réaliste et utile des acrobaties aériennes. Un modèle composé de 17 segments et de 42 degrés de liberté a été développé et personnalisé à une athlète de plongeon. Un système optoélectronique échantillonné à 300 Hz a permis l’acquisition de huit plongeons en situation réelle d’entraînement. La cinématique articulaire reconstruite avec un filtre de Kalman étendu a été utilisée comme entrée du modèle. Des erreurs quadratiques moyennes de 20° (salto) et de 9° (vrille) entre les performances simulées et réelles ont permis de valider le modèle. Enfin, une formation basée sur le simulateur a été offerte à 14 entraîneurs en sports acrobatiques. Une augmentation moyenne de 11 % des résultats aux questionnaires post-test a permis de constater le potentiel pédagogique de l’outil pour la formation.
Coaches need tools to better understand the mechanics of twisting somersaults and improve their knowledge and their athletes’ performance. The aim of this thesis was to provide them with a computer simulation model of aerial movements. An elite diver was modelled as a 17-segment 42-degree of freedom angle-driven model. The model was personalised to the diver so that simulation outputs could be compared with her actual performance. Input data were recorded by a 17-camera motion capture system sampled at 300 Hz. The joint angle time histories were reconstructed using an extended Kalman filter. The model was successfully evaluated and shown to produce realistic movements, with overall root-mean-square error of 20° (somersault) and 9° (twist) between reconstructed body kinematics and the corresponding simulations for eight dives. Finally, a workshop based on the simulation was offered to coaches and showed potential to improve their knowledge since the mean post-test result was increased by 11 %.

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Cuevas, Castell José Manuel [Verfasser]. "Mathematical modelling and 3-D computer simulation of Neogene carbonates (S. Spain) : unravelling the controlling factors of carbonate platform evolution / vorgelegt von José Manuel Cuevas Castell." 2006. http://d-nb.info/978168372/34.

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Dissertations / Theses on the topic 'Simulation modeling platform'

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