Dissertations / Theses on the topic '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.
Full textSterle, Lance. "Modeling Path Dependent Derivatives Using CUDA Parallel Platform." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu149263565284954.
Full textALBUQUERQUE, 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.
Full textCONSELHO 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.
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.
Full textSmith, Harrison B. "The Language And Platform Independent Steering (LAPIS) System." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337879192.
Full textGirmay, 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.
Full textDen 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.
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.
Full textBowlin, 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.
Full textBauer, 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.
Full textPh.D.
Department of Industrial Engineering and Management Systems
Engineering and Computer Science
Industrial Engineering and Management Systems
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.
Full textCyberattacksimulering 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.
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.
Full textSotnik, 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.
Full textLara, 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.
Full textDissertação (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
Alleau, Thibaut. "Development of a numerical platform to model the mitral valve." Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2649.
Full textMitral 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
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.
Full textThis 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.
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.
Full textVianna, 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/.
Full textA 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.
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.
Full textPei, 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/.
Full textAcevedo, 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.
Full textLuddeni, 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/.
Full textMotamed, 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.
Full textFloating 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
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.
Full textFrazer, 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.
Full textCaron, 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.
Full textPalma, 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.
Full textHouda, 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.
Full textThe 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
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.
Full textThe 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
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.
Full textThe 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
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.
Full textLi, Daming. "Modeling, simulation, and control of a Stewart platform." Thesis, 1996. http://hdl.handle.net/2429/5959.
Full textSu, 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.
Full text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.
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.
Full text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.
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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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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Jia, Zile. "Building Integration Requirement and High Quality Simulation Development: Bring Simulation into Practice." Doctoral thesis, 2019. https://tud.qucosa.de/id/qucosa%3A36536.
Full textGrant, Michael. "New modelling and simulation methods to support clean marine propulsion." Thesis, 2021. http://hdl.handle.net/1828/13308.
Full textGraduate
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.
Full textMathematical 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)
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.
Full textPhysics 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.
Lai, Gilbert Ming Yeung. "Modelling and Control of Small-Scale Helicopter on a Test Platform." Thesis, 2008. http://hdl.handle.net/10012/3761.
Full textMotaung, Mokete Isaac. "Modelling and control of an electric wheelchair virtual reality platform." 2014. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001341.
Full textDiscusses 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.
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.
Full textDevelopes 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.
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.
Full textToday’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.
Yue, Bonnie. "A Hardware-in-the-Loop Test Platform for Planetary Rovers." Thesis, 2011. http://hdl.handle.net/10012/6055.
Full textBujela, Buhle Wilfred. "Investigation into the robust modelling, control and simulation of a two-DOF gimbal platform for airborne applications." Thesis, 2014.
Find full textCrépeau, 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.
Full textCoaches 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 %.
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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