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Dissertations / Theses on the topic 'Reduced physical model'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Silva, Wilson José da. "Análise experimental e numérica da distribuição das ações verticais entre paredes de alvenaria estrutural com a utilização de modelo físico reduzido na escala 1:5." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-14052014-105118/.

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O presente trabalho teve como objetivo principal a análise experimental da distribuição das ações verticais entre paredes de alvenaria estrutural com a utilização de modelo físico reduzido na escala 1:5. Precedendo a construção do modelo físico reduzido foram realizados ensaios de caracterização dos componentes e da alvenaria na escala reduzida 1:5. Os ensaios no modelo físico reduzido consistiram na inserção de carregamentos uniformemente distribuídos e aplicados em diferentes ambientes e níveis. A análise da distribuição das ações verticais foi possível devido à instrumentação realizada na b

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2

Dupuis, Romain. "Surrogate models coupled with machine learning to approximate complex physical phenomena involving aerodynamic and aerothermal simulations." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0017/document.

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Les simulations numériques représentent un élément central du processus de conception d’un avion complétant les tests physiques et essais en vol. Elles peuvent notamment bénéficier de méthodes innovantes, telle que l’intelligence artificielle qui se diffuse largement dans l’aviation. Simuler une mission de vol complète pour plusieurs disciplines pose d’importants problèmes à cause des coûts de calcul et des conditions d’opérations changeantes. De plus, des phénomènes complexes peuvent se produire. Par exemple, des chocs peuvent apparaître sur l’aile pour l’aérodynamique alors que le mélange en

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3

DESHMUKH, DINAR V. "PHYSICS BASED REDUCED ORDER MODELS FOR FRICTIONAL CONTACTS." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1115997302.

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4

Bellemans, Aurélie. "Simplified plasma models based on reduced kinetics." Doctoral thesis, Universite Libre de Bruxelles, 2017. https://dipot.ulb.ac.be/dspace/bitstream/2013/261597/4/MAIN.pdf.

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Performing high-fidelity plasma simulations remains computationally expensive because of their large dimension and complex chemistry. Atmospheric re-entry plasmas for instance, involve hundreds of species in thousands of reactions used in detailed physical models. These models are very complex as they describe the non-equilibrium phenomena due to finite-rate processes in the flow. Chemical non-equilibrium arises because of the many dissociation, ionization and excitation reaction at various time-scales. Vibrational, rotational, electronic and translational temperatures characterize the flow an

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5

Khimasia, Mehul Mansukhlal Lakhamshi. "The physics of protein folding : optimisation, energy landscapes and reduced models." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624944.

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6

Aversano, Gianmarco. "Development of physics-based reduced-order models for reacting flow applications." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC095/document.

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L’objectif final étant de développer des modèles d’ordre réduit pour les applications de combustion, des techniques d’apprentissage automatique non supervisées et supervisées ont été testées et combinées dans les travaux de la présente thèse pour l’extraction de caractéristiques et la construction de modèles d’ordre réduit. Ainsi, l’application de techniques pilotées par les données pour la détection des caractéristiques d’ensembles de données de combustion turbulente (simulation numérique directe) a été étudiée sur deux flammes H2 / CO: une évolution spatiale (DNS1) et une jet à évolution tem

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7

Vairinhos, Hélvio. "Large-N reduced models of SU(N) lattice guage theories." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670101.

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8

Xu, Shaokang. "Study of reduced kinetic models for plasma turbulence." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX057/document.

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Le contrôle du transport turbulent est l'une des clés pour l'amélioration du temps de confinement nécessaire à la réalisation de la fusion thermonucléaire contrôlée. La description de la turbulence cinétique du plasma est un problème à 3 coordonnées spatiales et 3 coordonnées en vitesse. La théorie comme la simulation pour un problème de si haute dimensionnalité sont très difficiles, et des modèles réduits sont nécessaires pour comprendre la turbulence dans les Tokamaks. La technique largement utilisée est de faire moyenner le mouvement cyclotron, qui est beaucoup plus rapide que le phénomène

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9

Cheng, Xinwei. "Development of reduced reaction kinetics and fuel physical properties models for in-cylinder simulation of biodiesel combustion." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33397/.

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The analyses of spray, combustion and emission characteristics for two types of biodiesel fuels, namely coconut methyl ester (CME) and soybean methyl ester (SME) are reported in this thesis. In order to produce high fidelity numerical spray and combustion representation for CME and SME, accurately developed thermo-physical properties and chemical kinetics were integrated with open-source computational fluid dynamics codes. First, the thermo-physical properties of CME and SME which include liquid and vapour properties were calculated using temperature-dependent correlations that were found in t

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10

Syrén, Ludvig. "A method for introducing flexibility in rigid multibodies from reduced order elastic models." Thesis, Umeå universitet, Institutionen för fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-160417.

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In multibody dynamics simulation of robots and vehicles it is common to model the systems as being composed of mainly rigid bodies with articulation joints. With the trend to more lightweight robots, however, the structural flexibility of the robots link’s needs to be considered for realistic dynamic simulations. The link’s geometries are complex and finite element models (FEM) are required to compute the deformations. However, FEM includes too many degrees of freedom for time-efficient dynamics simulation. A popular method is to generate reduced order models from the FE models, but with much

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11

Gallagher, Stephen J. "Zonal flow generation through four wave interaction in reduced models of fusion plasma turbulence." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/59703/.

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In tokamaks, turbulence is a key contributor to cross field transport. However, it is also responsible for the spontaneous generation of large scale structures such as zonal ows. These are of relevance to fusion plasmas as they can create transport barriers which aid plasma confinement. The interaction between drift waves and zonal ows can be investigated using reduced models such as the Hasegawa- Mima and Hasegawa-Wakatani equations. A four-wave truncated model is developed for the Extended-Hasegawa-Mima (EHM) equation. This produces a set of four ordinary differential equations (ODEs) that a

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12

Sullivan, Taylor D. "REDUCED ORDER MODELING OF FLOW OVER A NACA 0015 AIRFOIL FOR FUTURE CONTROL APPLICATION." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1407295741.

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13

Nghiem, Huu-Luyen. "Evaluation des dommages induits par des mouvements de terrain sur des structures en maçonnerie à l'aide de la modélisation physique." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI012/document.

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Les structures en maçonnerie représentent une proportion importante des maisons individuelles et sont plus vulnérables notamment lorsqu'elles sont soumises à des mouvements de terrain. Pour faire face aux conséquences de ce problème, une plate-forme d'essais a été développée pour simuler des mouvements de terrain et leur effet sur des modèles de structure en surface. Ce travail de thèse s'appuie sur un modèle physique réduit et développe des méthodes d'évaluation des dommages des structures maçonnées à l'aide de l'expérimentation physique. Dans un premier temps, un modèle physique à échelle ré

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14

Hebert, James L. "Use of Multi-Fidelity and Surrogate Models to Reduce the Cost of Developing Physics-Based Systems." Thesis, The George Washington University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3687685.

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<p> Building complex physics-based systems in a timely cost-effective manner, that perform well, meet diverse user needs, and have no bad emergent behaviors is a challenge. To meet these requirements the solution is to model the physics-based system before building it. Modeling and Simulation capabilities for these type systems have advanced continuously during the past 20 years thanks to progress in the application of high fidelity computational codes that are able to model the real physical performance of system components. The problem is that it is often too time consuming and costly to mod

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15

Gehrmann, Jan. "Transferable reduced TB models for elemental Si and N and binary Si-N systems." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:002b0c99-0e9d-4d8c-a0dc-ad07383f083f.

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Silicon nitride is a bulk and a coating material exhibiting excellent mechanical properties. The understanding of the complex processes at the nanometre scale gained through experimental research will be enhanced by the existence of a computationally efficient and accurate model that is able to describe the mechanical properties of silicon nitride. Such a model has yet to be proposed. In this thesis we present a transferable reduced tight-binding (TB) model for the silicon nitride system. More precisely, this model consists of a reduced TB model for elemental silicon, a reduced TB model for el

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16

Lülf, Fritz Adrian. "An integrated method for the transient solution of reduced order models of geometrically nonlinear structural dynamic systems." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2013. http://tel.archives-ouvertes.fr/tel-00957455.

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For repeated transient solutions of geometrically nonlinear structures the numerical effort often poses a major obstacle. Thus, the introduction of a reduced order model, which takes the nonlinear effects into account and accelerates the calculations considerably, is often necessary.This work yields a method that allows for rapid, accurate and parameterisable solutions by means of a reduced model of the original structure. The structure is discretised and its dynamic equilibrium described by a matrix equation. The projection on a reduced basis is introduced to obtain the reduced model. A compr

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17

Brewer, Allan Ronald. "Computational protein structure prediction using physico-chemical force fields : assessing reduced-atom and torsional models for accelerating the phase-space search process." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427889.

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18

Maurício, Rodrigo Menossi [UNESP]. "Estudo teórico e experimental das ligações diretas contra-fiadas entre paredes de blocos de concreto em escala real e reduzida 1:4." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/90739.

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Made available in DSpace on 2014-06-11T19:24:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-03-18Bitstream added on 2014-06-13T18:52:37Z : No. of bitstreams: 1 mauricio_rm_me_ilha_prot.pdf: 7189412 bytes, checksum: 165c0a934d87bdea5e70b44e57f92b0a (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>O principal objetivo do trabalho foi desenvolver o estudo de ligações diretas entre paredes de blocos de concreto em escala real e reduzida 1A. Foram realizados ensaios de resistência à compress

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19

Jeannot, Benjamin. "Modélisation hydrologique intégrée de bassins versants fortement transitoires : développement d'outils numériques et applications." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAH009/document.

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L’objectif du travail de thèse est d'œuvrer au développement et à l’application d’un modèle hydrologique intégré pré-existant (Pan et al., 2015; Weill et al., 2017) : Normally Integrated Model (NIM). La spécificité de ce modèle est d’intégrer l’équation d’écoulement souterrain 3D sur la direction perpendiculaire au substratum, de façon à se ramener à un problème en deux dimensions. Il en résulte un gain substantiel en termes de temps de simulation, et une économie du point de vue de l’espace mémoire requis. Dans le cadre de cette thèse, NIM a été entièrement recodé et optimisé. Un module de ru

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20

Thornes, Tobias. "Investigating the potential for improving the accuracy of weather and climate forecasts by varying numerical precision in computer models." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:038874a3-710a-476d-a9f7-e94ef1036648.

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Accurate forecasts of weather and climate will become increasingly important as the world adapts to anthropogenic climatic change. Forecasts' accuracy is limited by the computer power available to forecast centres, which determines the maximum resolution, ensemble size and complexity of atmospheric models. Furthermore, faster supercomputers are increasingly energy-hungry and unaffordable to run. In this thesis, a new means of making computer simulations more efficient is presented that could lead to more accurate forecasts without increasing computational costs. This 'scale-selective reduced p

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21

Maurício, Rodrigo Menossi. "Estudo teórico e experimental das ligações diretas contra-fiadas entre paredes de blocos de concreto em escala real e reduzida 1:4 /." Ilha Solteira : [s.n.], 2005. http://hdl.handle.net/11449/90739.

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Orientador: Jefferson Sidney Camacho<br>Banca: Rogério de Oliveira Rodrigues<br>Banca: Luiz Roberto Prudêncio Júnior<br>Resumo: O principal objetivo do trabalho foi desenvolver o estudo de ligações diretas entre paredes de blocos de concreto em escala real e reduzida 1A. Foram realizados ensaios de resistência à compressão axial e medidas as deformações em blocos, prismas e paredes nas duas escalas. Também foram montadas paredes em forma de H assentadas sobre bases de concreto armado. Estas foram construídas de 2 formas: na primeira, chamada de PRl, foram construídas 3 (três) unidades de modo

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22

Gasparin, Suelen. "Numerical methods for predicting heat and moisture transfer through porous building materials." Thesis, Université Grenoble Alpes (ComUE), 2019. https://thares.univ-grenoble-alpes.fr/2019GREAM077.pdf.

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La consommation énergétique des bâtiments est directement impactée par les variables climatiques et en particulier par la température, la radiation solaire, la pression atmosphérique, l’humidité relative et la vitesse du vent. La maîtrise de la performance hygrothermique des bâtiments permet la conception d’ouvrage à faible consommation énergétique intégrant des enveloppes durables et dépourvues de risques de pathologies liées à l’humidité. Ainsi, les architectes et constructeurs nécessitent de disposer d’outils, pour simuler les performances de l’enveloppe sur le long terme, qui reposent sur

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23

Franci, Alessio. "Pathological synchronization in neuronal populations : a control theoretic perspective." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00695029.

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In the first part of this thesis, motivated by the development of deep brain stimulation for Parkinson's disease, we consider the problem of reducing the synchrony of a neuronal population via a closed-loop electrical stimulation. This, under the constraints that only the mean membrane voltage of the ensemble is measured and that only one stimulation signal is available (mean-field feedback). The neuronal population is modeled as a network of interconnected Landau-Stuart oscillators controlled by a linear single-input single-output feedback device. Based on the associated phase dynamics, we an

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24

Dumon, Antoine. "Réduction dimensionnelle de type PGD pour la résolution des écoulements incompressibles." Phd thesis, Université de La Rochelle, 2011. http://tel.archives-ouvertes.fr/tel-00644565.

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L'objectif de ce travail consiste à développer la méthode de résolution PGD (Proper Generalized Decomposition), qui est une méthode de réduction de modèle où la solution est recherchée sous forme séparée, à la résolution des équations de Navier-Stokes. Dans un premier temps, cette méthode est appliquée à la résolution d'équations modèles disposant d'une solution analytique. L' équation de diffusion stationnaire 2D et 3D, l'équation de diffusion instationnaire 2D et les équations de Burgers et Stokes sont traitées. Nous montrons que dans tous ces cas la méthode PGD permet de retrouver les solut

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25

Jacqmin, Thibaut. "Mesures de corrélations dans un gaz de bosons unidimensionnel sur puce." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00779447.

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Nous présentons dans ce manuscrit des mesures de corrélations spatiales à un et deux corps effectuées sur un gaz de bosons unidimensionnel et ultra-froid piégé à la surface d'une microstructure. Les corrélations à deux corps sont mises en évidence par des mesures de fluctuations de densité in situ ; les corrélations à un corps sont sondées grâce à des mesures de distributions en impulsion. Nous avons observé des fluctuations de densité sub-poissoniennes dans le régime d'interactions faibles, mettant ainsi en évidence pour la première fois le sous-régime du régime de quasi-condensat dans lequel

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26

Eberle, Robert Raymond. "A physically motivated reduced-order modal energy technique for ARMA spectrum estimation." Thesis, 1995. http://hdl.handle.net/1911/16816.

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A reduced-order modal energy (ROME) technique for spectrum estimation is introduced. In this technique the transfer function of a higher-order autoregressive (AR) model of a power spectrum is decomposed into partial fractions. These individual fractions are examined from the perspective of relative significance to the total energy of the system. First, the technique is formulated for a scalar random process (the univariate case). In the derivation, two solution procedures are discussed. In one procedure, a system of equations is solved to determine the unknown numerator coefficients of the par

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27

Atef, Nour. "Numerically investigating the effects of gasoline surrogate physical and chemical properties in a gasoline compression ignition (GCI) engine." Diss., 2018. http://hdl.handle.net/10754/628032.

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Gasoline compression ignition (GCI) engines show promise in meeting stringent new environmental regulations, as they are characterized by high efficiency and low emissions. Simulations using chemical kinetic models provide an important platform for investigating the behaviors of the fuels inside these engines. However, because real fuels are complex, simulations require surrogate mixtures of small numbers of species that can replicate the properties of real fuels. Accordingly, the development of high fidelity, well-validated kinetic models for surrogates is critical in order to accuratel

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28

Bulušek, Petr. "Vizuálně realistické modelování deformací dynamických objektů." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-321438.

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The present work deals with simulation methods for rigid bodies and deformable bodies. In the first chapter you can find research of some methods for simulation of rigid body physics with emphasis on method used in open source physics engine Bullet. In second chapter you can find methods for simulation of deformable bodies, again with emphasis on Bullet physics engine. In last chapter model order reduction technique is presented. This method enables to reduce system of ordinary differential equations. These equations come for example from applying finite element method to partial differential

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29

Nghiem, Huu Luyen. "Evaluation des dommages induits par des mouvements de terrain sur des structures en maçonnerie à l'aide de la modélisation physique." Thesis, 2015. http://www.theses.fr/2015GRENI012/document.

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Les structures en maçonnerie représentent une proportion importante des maisons individuelles et sont plus vulnérables notamment lorsqu'elles sont soumises à des mouvements de terrain. Pour faire face aux conséquences de ce problème, une plate-forme d'essais a été développée pour simuler des mouvements de terrain et leur effet sur des modèles de structure en surface. Ce travail de thèse s'appuie sur un modèle physique réduit et développe des méthodes d'évaluation des dommages des structures maçonnées à l'aide de l'expérimentation physique. Dans un premier temps, un modèle physique à échelle ré

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30

Nguyen, Phung Anh (Alex), and 顏安峰. "“Big Data” Approach to Improve Patient Safety and Reduce Medication Errors in Computerized Physician Order Entry (CPOE) system: A Probabilistic Model." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/6nw2v9.

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博士<br>國立陽明大學<br>生物醫學資訊研究所<br>102<br>Health information technology (HIT) is the area where health care experts, policymakers, payers, and consumers consider health information technologies, such as electronic health records (EHR) and computerized physician order entry (CPOE), to be critical to transforming the health care industry. Due to the rapid pace of change in technology that had dramatically increased health data accumulated by the health providers. The allure of big data and healthcare analytics is that they can unlock the potential of this information by extracting, analyzing, and maki

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