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Dissertations / Theses on the topic 'Equation statics'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Филатов, Вл Д., та В. А. Смирнов. "Определение опорных реакций в статически определимых балках и криволинейных стержнях". Thesis, Сумский государственный университет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/39910.

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Рассмотрено четыре задачи: однопролетная одноконсольная и консольная балки, два криволинейных стержня с шарниром. Для первых двух задач предложена следующая методика решения: составление конструктивной и расчетной схем использования принципа освобождаемости от связей и определение степени статической неопределимости. Затем составление 3х независимых уравнений статики, выполнение проверки решения.

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2

Беловол, В. О., Василь Анатолійович Смірнов, Василий Анатольевич Смирнов та Vasyl Anatoliiovych Smirnov. "Рассмотрение задач прочности и жёсткости при деформации поперечного изгиба с учётом теории обучения". Thesis, Сумский государственный университет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/39900.

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Теория обучения, т.е. дидактика, должна ответить на два главных вопроса: чему учить и как учить. Рассматривая первый вопрос с учётом задачи прочности, вводилось понятие о расчётной схеме и её преобразования из конструктивной. Заменяя связи: шарнирно-подвижную и неподвижную опоры на реакции V,H изучался принцип освобождаемости от связей. С учётом составления трёх независимых уравнений статики отмечалось, что данная балка относится к плоской системе произвольно расположенных сил.

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3

Mauch, Sean Patrick Meiron Daniel I. "Efficient algorithms for solving static Hamilton-Jacobi equations /." Diss., Pasadena, Calif. : California Institute of Technology, 2003. http://resolver.caltech.edu/CaltechETD:etd-05202003-170423.

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4

Finch, M. R. "The Painleve-Gambier equation and the relativistic static fluid sphere." Thesis, University of Sussex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380529.

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5

Sotoudeh, Zahra. "Nonlinear static and dynamic analysis of beam structures using fully intrinsic equations." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41179.

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Beams are structural members with one dimension much larger than the other two. Examples of beams include propeller blades, helicopter rotor blades, and high aspect-ratio aircraft wings in aerospace engineering; shafts and wind turbine blades in mechanical engineering; towers, highways and bridges in civil engineering; and DNA modeling in biomedical engineering. Beam analysis includes two sets of equations: a generally linear two-dimensional problem over the cross-sectional plane and a nonlinear, global one-dimensional analysis. This research work deals with a relatively new set of equations

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6

Rasch, Christian Mark Anton. "Numerical discretization of static Hamilton-Jacobi equations on triangular meshes." [S.l.] : [s.n.], 2007. http://mediatum2.ub.tum.de/doc/604594/document.pdf.

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7

Sommerville, Lesley Laverne. "A Parabolized navier-stokes model for static mixers." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19535.

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8

Alton, Ken. "Dijkstra-like ordered upwind methods for solving static Hamilton-Jacobi equations." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/25030.

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The solution of a static Hamilton-Jacobi Partial Differential Equation (HJ PDE) can be used to determine the change of shape in a surface for etching/deposition/lithography applications, to provide the first-arrival time of a wavefront emanating from a source for seismic applications, or to compute the minimal-time trajectory of a robot trying to reach a goal. HJ PDEs are nonlinear so theory and methods for solving linear PDEs do not directly apply. An efficient way to approximate the solution is to emulate the causal property of this class of HJ PDE: the solution at a particular point only de

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9

Ruffini, Sara. "Equation based modelling for the energy control of underground station systems." Doctoral thesis, Università Politecnica delle Marche, 2016. http://hdl.handle.net/11566/243131.

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Il lavoro di tesi si è svolto all’interno del progetto europeo Sustainable Energy mAnageMent for Underground Stations (SEAM4US), Grant agreement 285408 del 7°FP, finalizzato allo studio del controllo ottimo dei sistemi energetici nelle stazioni metropolitane, che ha previsto la realizzazione di un pilot nella stazione Passeig de Gracia della metropolitana di Barcellona (SP). Il principale obiettivo della ricerca è stato quindi lo sviluppo di una libreria per la modellazione delle dinamiche energetiche e degli impianti che fosse compatibile con i requisiti imposti dai processi di progettazio

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10

Mitra, Dhrubaditya. "Studies of Static and Dynamic Multiscaling in Turbulence." Thesis, Indian Institute of Science, 2004. https://etd.iisc.ac.in/handle/2005/122.

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The physics of turbulence is the study of the chaotic and irregular behaviour in driven fluids. It is ubiquitous in cosmic, terrestrial and laboratory environments. To describe the properties of a simple incompressible fluid it is sufficient to know its velocity at all points in space and as a function of time. The equation of motion for the velocity of such a fluid is the incompressible Navier–Stokes equation. In more complicated cases, for example if the temperature of the fluid also fluctuates in space and time, the Navier–Stokes equation must be supplemented by additional equations. Incomp

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Mitra, Dhrubaditya. "Studies of Static and Dynamic Multiscaling in Turbulence." Thesis, Indian Institute of Science, 2004. http://hdl.handle.net/2005/122.

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CSIR (INDIA), IFCPAR<br>The physics of turbulence is the study of the chaotic and irregular behaviour in driven fluids. It is ubiquitous in cosmic, terrestrial and laboratory environments. To describe the properties of a simple incompressible fluid it is sufficient to know its velocity at all points in space and as a function of time. The equation of motion for the velocity of such a fluid is the incompressible Navier–Stokes equation. In more complicated cases, for example if the temperature of the fluid also fluctuates in space and time, the Navier–Stokes equation must be supplemented by addi

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12

Balupari, Raja Shekar. "VALIDATION OF FINITE ELEMENT PROGRAM FOR JOURNAL BEARINGS -- STATIC AND DYNAMIC PROPERTIES." UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/325.

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The analysis of bearing systems involves the prediction of their static and dynamic characteristics. The capability to compute the dynamic characteristics for hydrodynamic bearings has been added to Bearing Design System (BRGDS), a finite element program developed by Dr. R.W. Stephenson, and the results obtained were validated. In this software, a standard finite element implementation of the Reynolds equation is used to model the land region of the bearing with pressure degrees of freedom. The assumptions of incompressible flow, constant viscosity, and no fluid inertia terms are made. The pre

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13

Kolesnichenko, Anna, and Galina Shopina. "Valuation of portfolios under uncertain volatility : Black-Scholes-Barenblatt equations and the static hedging." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1634.

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<p>The famous Black-Scholes (BS) model used in the option pricing theory</p><p>contains two parameters - a volatility and an interest rate. Both</p><p>parameters should be determined before the price evaluation procedure</p><p>starts. Usually one use the historical data to guess the value of these</p><p>parameters. For short lifetime options the interest rate can be estimated</p><p>in proper way, but the volatility estimation is, as well in this case,</p><p>more demanding. It turns out that the volatility should be considered</p><p>as a function of the asset prices and time to make the valuati

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14

Ferrante, Cristian. "Cosmological and static spherically symmetric solutions to Einstein equations with an exponential scalar potential." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25606/.

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Exponential potentials can be associated both with expanding and collapsing cos- mologies: whereas power-law inflation can be obtained for a nearly flat exponential potential, a stable contracting cosmology (which, by the way, can solve the hori- zon problem) can be obtained for a negative sufficiently steep exponential potential. Motivated by these results, we study the Einstein equation for a scalar field with an exponential potential in a static and spherically symmetric spacetime. For the same parameters which describe a stable contracting cosmology, we find a non- asymptotically flat blac

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15

Chaudhry, Ehtzaz. "Skin deformation and animation of character models based on static and dynamic ordinary differential equations." Thesis, Bournemouth University, 2016. http://eprints.bournemouth.ac.uk/25037/.

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Animated characters play an important role in the field of computer animation, simulation and games. The basic criterion of good character animation is that the animated characters should appear realistic. This can be achieve through proper skin deformations for characters. Although various skin deformation approaches (Joint-based, Example-based, Physics-based, Curve-based and PDE-based) have been developed, the problem of generating realistic skin deformations efficiently with a small data set is a big challenge. In order to address the limitations of skin deformation, this thesis presents a

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16

Snyder, Troy Alan. "On Hydrodynamic Lubrication using Perturbed Reynolds equation and CFD-FSI: Static and Dynamic Characteristics of Compliant Marine Bearings." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron157552061871739.

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17

Wang, Chao. "Static, dynamic and levitation characteristics of squeeze film air journal bearing : designing, modelling, simulation and fluid solid interaction." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/5832.

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Bearings today need to be able to run at very high speed, providing high positional accuracy for the structure that it supports, and requiring very little or no maintenance. For this to happen, bearings must have tight tolerances and very low or zero friction during operation. This pushes many traditional contact-type bearings to their limits as they often fail due to friction, generating heat and causing wear. By comparison, existing non-contact bearings fare better because of their very low or zero friction. But some have their own problem too. For example, the fact that aerostatic bearings

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18

Beauregard, Matthew Alan. "Nonlinear Dynamics of Elastic Filaments Conveying a Fluid and Numerical Applications to the Static Kirchhoff Equations." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/194164.

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Two problems in the study of elastic filaments are considered.First, a reliable numerical algorithm is developed that candetermine the shape of a static elastic rod under a variety ofconditions. In this algorithm the governing equations are writtenentirely in terms of local coordinates and are discretized usingfinite differences. The algorithm has two significant advantages:firstly, it can be implemented for a wide variety of the boundaryconditions and, secondly, it enables the user to work with generalconstitutive relationships with only minor changes to thealgorithm. In the second problem a

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19

Kalinski, Michael E. "Hypervelocity impact analysis of International Space Station Whipple and Enhanced Stuffed Whipple Shields." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FKalinski.pdf.

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Thesis (M.S. in Astronautical Engineering)--Naval Postgraduate School, Dec. 2004.<br>Thesis Advisor(s): Eric Christiansen, Terry R. McNelley. Includes bibliographical references (p. 275-276) Also available online.

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20

Thaller, Daniela. "Inter-technique combination based on homogeneous normal equation systems including station coordinates, earth orientation and troposphere parameters." kostenfrei, 2008. http://mediatum2.ub.tum.de/doc/635109/635109.pdf.

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21

Bahrampouri, Mahdi. "Ground Motion Prediction Equations for Non-Spectral Parameters using the KiK-net Database." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/87704.

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The KiK-net ground motion database is used to develop ground motion prediction equations for Arias Intensity (Ia), 5-95% Significant Duration (Ds5-95), and 5-75% Significant Duration (Ds5-75). Relationships are developed both for shallow crustal earthquakes and subduction zone earthquakes (hypocentral depth less than 45 km). The models developed consider site amplification using VS30 and the depth to a layer with VS=800 m/s (h800). We observe that the site effect for is magnitude dependent. For Ds5-95 and Ds5-75, we also observe strong magnitude dependency in distance attenuation. We compare

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22

Pemmanaboina, Rajashekar. "Assessing Crash Occurrence On Urban Freeways Using Static And Dynamic Factors By Applying A System Of Interrelated Equations." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2617.

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Traffic crashes have been identified as one of the main causes of death in the US, making road safety a high priority issue that needs urgent attention. Recognizing the fact that more and effective research has to be done in this area, this thesis aims mainly at developing different statistical models related to the road safety. The thesis includes three main sections: 1) overall crash frequency analysis using negative binomial models, 2) seemingly unrelated negative binomial (SUNB) models for different categories of crashes divided based on type of crash, or condition in which they occur, 3)

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23

Azegami, Hideyuki. "A Proposal of a Shape-Optimization Method Using a Constitutive Equation of Growth (In the Case of a Static Elastic Body)." 日本機械学会, 1990. http://hdl.handle.net/2237/7275.

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24

Khanal, Kiran. "Monte Carlo Stimulations to Study The Effect of Chain Stiffness on Static, Dynamic, and Equation-of-State Properties of Polymer Melts." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1251402309.

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25

Khanal, Kiran. "Monte Carlo simulations to study the effect of chain stiffness on static, dynamic, and equation-of-state properties of polymer melts." Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1251402309.

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Thesis (M.S.)--University of Akron, Dept. of Physics, 2009.<br>"August, 2009." Title from electronic thesis title page (viewed 10/21/2009) Advisor, Jutta Luettmer-Strathmann; Committee members, Alper Buldum, Ben Yu-Kuang Hu; Department Chair, Robert R. Mallik; Dean of the College, Chand Midha; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

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26

NAKANO, MASAKI, AKIRA ASAOKA, and TOSHIHIRO NODA. "SOIL-WATER COUPLED FINITE DEFORMATION ANALYSIS BASED ON A RATE-TYPE EQUATION OF MOTION INCORPORATING THE SYS CAM-CLAY MODEL." 地盤工学会, 2008. http://hdl.handle.net/2237/20062.

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27

Edirisinghe, Pathirannehelage Neranjan S. "Charge Transfer in Deoxyribonucleic Acid (DNA): Static Disorder, Dynamic Fluctuations and Complex Kinetic." Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/phy_astr_diss/45.

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The fact that loosely bonded DNA bases could tolerate large structural fluctuations, form a dissipative environment for a charge traveling through the DNA. Nonlinear stochastic nature of structural fluctuations facilitates rich charge dynamics in DNA. We study the complex charge dynamics by solving a nonlinear, stochastic, coupled system of differential equations. Charge transfer between donor and acceptor in DNA occurs via different mechanisms depending on the distance between donor and acceptor. It changes from tunneling regime to a polaron assisted hopping regime depending on the donor-acc

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28

Treude, Jan-Hendrik Verfasser], and Felix [Akademischer Betreuer] [Finster. "Decay in outgoing null directions of solutions of the massive Dirac equation in certain asymptotically flat, static spacetimes / Jan-Hendrik Treude. Betreuer: Felix Finster." Regensburg : Universitätsbibliothek Regensburg, 2015. http://d-nb.info/107616109X/34.

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29

Borghini, Stefano. "On the characterization of static spacetimes with positive cosmological constant." Doctoral thesis, Scuola Normale Superiore, 2018. http://hdl.handle.net/11384/85730.

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In this thesis we study static vacuum spacetimes. These are very special solutions of the Einstein Field Equations in General Relativity, where the Lorentzian structure disappears and we are left with the study of a system of PDEs on a Riemannian manifold. Although they represent the simplest examples of spacetimes, their study is by no means trivial. Our main focus will be on spacetimes with positive cosmological constant, even though we will provide a general overview of the other cases as well. Our main contribution is the introduction of a new notion of mass (which will be called v

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30

Bränd, Emelie, and Ann-Mari Olofsson. "Experiments and simulations of the flow velocity distribution downstream the Xiluodu hydropower station." Thesis, Uppsala universitet, Elektricitetslära, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-143818.

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Hydropower is a more environmental friendly way of producing electric power than many other alternatives today. Though, the effects of constructing mega dams are much tangible for the local eco systems in addition to changing many people’s lives forever. In order to prevent floods, riverbank erosions or landslides, proper investigations of the environmental impact from dam constructions must be performed. One of the key parameters in such investigations is the flow discharge velocity. This master thesis treats experimental measurements and numerical simulations of the velocity downstream a mod

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31

Kaymak, Yalcin. "A Composite Frame/joint Super Element For Structures Strengthened By Externally Bonded Steel/frp Plates." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1052547/index.pdf.

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A materially non-linear layered beam super element is developed for the analysis of RC beams and columns strengthened by externally bonded steel/FRP plates. The elasto-plastic behavior of RC member is incorporated by its internally generated or externally supplied moment-curvature diagram. The steel plate is assumed to be elasto-plastic and the FRP laminate is assumed to behave linearly elastic up to rupture. The thin epoxy layer between the RC member and the externally bonded lamina is simulated by a special interface element which allows for the changing failure modes from steel plate yieldi

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32

Feliú, Gabaldón Marco Antonio. "Logic-based techniques for program analysis and specification synthesis." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/33747.

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La Tesis investiga técnicas ágiles dentro del paradigma declarativo para dar solución a dos problemas: el análisis de programas y la inferencia de especificaciones a partir de programas escritos en lenguajes multiparadigma y en lenguajes imperativos con tipos, objetos, estructuras y punteros. Respecto al estado actual de la tesis, la parte de análisis de programas ya está consolidada, mientras que la parte de inferencia de especificaciones sigue en fase de desarrollo activo. La primera parte da soluciones para la ejecución de análisis de punteros especificados en Datalog. En esta parte se han

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33

Oyarbide-Usabiaga, Estanislao. "Commande passive des structures de l'électronique de puissance." Grenoble INPG, 1998. http://www.theses.fr/1998INPG0097.

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Cette thèse est une étude exploratoire autour des apports de la commande passive et de sa version adaptative dans le champ de l'électronique de puissance. En première partie, après des rappels théoriques, les propriétés génériques des convertisseurs sous le formalisme d'Euler-Lagrange sont présentées. Ces propriétés rendent l'application de la commande passive naturelle. En seconde partie, des exemples d'application sont traités, ils sont choisis de manière à englober un large éventail de familles de convertisseurs. Les modèles de réglage vont du modèle moyen standard au modèle moyen généralis

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Dang, Thi Thu Huong, Huu Thu Do, Minh Quang Trinh, Hung Manh Nguyen, Thi Tuyet Xuan Bui, and Tien Dung Nguyen. "Allometric relations between biomass and diameter at breast height and height of tree in natural forests at Me Linh Station for Biodiversity, Vinh Phuc Province, Vietnam." Technische Universität Dresden, 2018. https://tud.qucosa.de/id/qucosa%3A33298.

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Stem diameter at breast height (D1.3m) and tree height (H) are commonly used measures of tree growth. Based on correlation analysis between biomass of stem, branches and leaves and stem diameter and height of tree we can identify allometric equation for predicting biomass and carbon sequestration of the vegetation. This study was carried out in the natural forests of Me Linh Station for biodiversity to develop allometric equation between biomass and diameter at breast height and height of tree. The study results indicated that twenty tree species dominate in natural forests in Me Linh Station

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Zhou, Yang. "Parametric stability analyses for fluid-loaded thin membranes." Licentiate thesis, KTH, Strukturmekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176030.

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Membrane structures are commonly used in many elds. The studies of thesestructures are of increasing interest. The two projects focus on the evaluations ofequilibrium states for uid-pressurized membranes under dierent loading conditions,and the corresponding instability behavior.The rst part of the current work discusses the instability behavior of a thin,planar, circular and initially horizontal membrane subjected to downwards or upwards uid pressure. The membrane structures exhibit large deformations under uid pressure. Various instability behaviors have been observed for dierent loadingpara

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Bayliss, David. "Labour market status and well-being during the Great Recession : a changing relationship?" Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/labour-market-status-and-wellbeing-during-the-great-recession-a-changing-relationship(3d2bc5cd-d1f9-49cd-a6cd-ec0ef194c3eb).html.

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This thesis investigates the relationship between labour market statuses and well-being in the UK working age population, and the moderating role of the Great Recession. Research on the relationship between labour market statuses and well-being outcomes identifies negative associations with unemployment and economic inactivity. These findings are typically presented as independent of macroeconomic conditions, but to what extent does this assumption hold? The central proposition of this thesis, is that economic crises moderate the way in which labour market statuses affect well-being, thereby c

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Пигнастый, Олег Михайлович, та Виктор Яковлевич Заруба. "Задачи программного управления параметрами поточной линии с использованием сверхурочных работ". Thesis, ЦНИИ "Электроприбор", 2012. http://repository.kpi.kharkov.ua/handle/KhPI-Press/42004.

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Рассмотрены основные элементы технологического процесса. Показана их взаимосвязь между собой в ходе движения предмета труда по технологическому маршруту. Детально рассмотрено техническое содержание задачи управления параметрами технологического процесса через сверхурочные работы. Представлена модель управления параметрами технологического процесса, основанная на статистических балансовых уравнениях для макропараметров технологического процесса. Поставлена задача программного управления параметрами технологического процесса.

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Pokorný, Jan. "Výpočtové modelování radiálních hydrodynamických ložisek pro vodní stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382572.

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The aim of this thesis is to calculate the stiffness and damping coefficients for radial hydrodynamic bearings. Cylindrical and lemon hydrodynamic bearings are considered. The solution to this problem mainly depends on the hydrodynamic pressure in the bearing. The numerical solution of the Reynolds equation is used to calculate the pressure. The effect of variable viscosity and density of the lubricant due to temperature changes is considered. The static equilibrium position of the journal centre is also solved. The stiffness and damping coefficients are determined using small amplitude journa

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Brancatelli, Giuseppe. "Analisi di dati acquisiti con OBS." Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3458.

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2008/2009<br>Gli OBS (Ocean Bottom Seismometer) sono ampiamente utilizzati negli studi sismici crostali attraverso l’utilizzo delle registrazioni di onde rifratte e riflesse a grande offset (Wide Angle Reflection/Refraction, WAR/R). L'analisi di questi dati comporta, solitamente, l'impiego di modellistica diretta e/o inversa al fine di giungere alle velocità dei singoli strati e alle profondità delle interfacce. In questa tesi, invece, si presenta un approccio diverso che prevede: 1) costruzione di modelli di velocità dall’analisi dei segnali rifratti; 2) elaborazione dei dati OBS al fine di o

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Pihnastyi, O. M., G. K. Kozhevnikov, and Tetiana Bondarenko. "The information controlling model transport system during transient conditions." Thesis, Institute of Electrical and Electronics Engineers, Inc., USA, 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48796.

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This article is devoted to designing an information management system for the conveyor line of mining enterprises. The analytical design method for the transient mode of the stepped speed control system of the conveyor line was developed. The partial differential equation was used in constructing the conveyor line model. The description of the production system is fulfilled in the single step approximation. A decision was obtained which determines the state of the parameters of the production line for a technological position specified as a function of time. Has been determined the length of t

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Teixeira, Denis Leocádio. "Determinação do gradiente de pressão estática do ar para sistemas de compostagem por aeração forçada." Universidade Federal de Viçosa, 2014. http://locus.ufv.br/handle/123456789/3672.

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Made available in DSpace on 2015-03-26T13:23:59Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1263079 bytes, checksum: 4f8dcc7d9121a93cc4f882cd8390c608 (MD5) Previous issue date: 2014-07-18<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Although there equations and graphics in scientific literature to estimate the static pressure gradient of airflow through layers of grains and seeds, studies using organic waste submitted to composting treatment are scarce. The objective of this study was to adjust equations to estimate the static pressure gradient of airflow through la

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Marion, Romain. "Contribution à la modélisation du magnétisme statique et dynamique pour le génie électrique." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00839041.

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De nos jours, la modélisation numérique constitue un outil indispensable pour le prototypage de convertisseurs électromagnétiques. Les matériaux magnétiques jouent un rôle essentiel dans la conversion de l'énergie, il est donc nécessaire de maîtriser leur comportement et leur représentation. L'objectif de ce travail s'inscrit dans ce cadre et s'attache à élaborer des lois réalistes de comportement de matériaux afin de les inclure dans des simulateurs de circuits. Concernant le comportement statique, le modèle de Jiles-Atherton a été implémenté puis adapté, simplifié et modifié afin d'en amélio

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Kazemi, Noj. "Circuit analysis of a parallel plate waveguide." Thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-222617.

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The aim of this work was to model a four-port waveguide as a simple circuit,by first starting with a two-port then a three-port waveguide. Duethat the work was based on Nathan Marcuvitz book Waveguide handbook,an analytical solution for the circuit parameters was desired. In order toobtain an analytical solution three methods were studied; the Variationalmethod, the Integral equation method and the Static method. Out of thesethree methods the latter was chosen, because its strength of simplifying theboundary conditions. The goal to model a four-port and a three-portedwaveguide was too complica

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Janon, Alexandre. "Analyse de sensibilité et réduction de dimension. Application à l'océanographie." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00757101.

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Les modèles mathématiques ont pour but de décrire le comportement d'un système. Bien souvent, cette description est imparfaite, notamment en raison des incertitudes sur les paramètres qui définissent le modèle. Dans le contexte de la modélisation des fluides géophysiques, ces paramètres peuvent être par exemple la géométrie du domaine, l'état initial, le forçage par le vent, ou les coefficients de frottement ou de viscosité. L'objet de l'analyse de sensibilité est de mesurer l'impact de l'incertitude attachée à chaque paramètre d'entrée sur la solution du modèle, et, plus particulièrement, ide

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Pace, Michele. "Stochastic models and methods for multi-object tracking." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2011. http://tel.archives-ouvertes.fr/tel-00651396.

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La poursuite multi-cibles a pour objet le suivi d'un ensemble de cibles mobiles à partir de données obtenues séquentiellement. Ce problème est particulièrement complexe du fait du nombre inconnu et variable de cibles, de la présence de bruit de mesure, de fausses alarmes, d'incertitude de détection et d'incertitude dans l'association de données. Les filtres PHD (Probability Hypothesis Density) constituent une nouvelle gamme de filtres adaptés à cette problématique. Ces techniques se distinguent des méthodes classiques (MHT, JPDAF, particulaire) par la modélisation de l'ensemble des cibles comm

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Patier, Laurent. "Etude de techniques de calculs multi-domaines appliqués à la compatibilité électromagnétique." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00834164.

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Le contexte d'étude est celui de la Compatibilité ÉlectroMagnétique (CEM). L'objectif de la CEM est, comme son nom l'indique, d'assurer la compatibilité entre une source de perturbation électromagnétique et un système électronique victime. Or, la prédiction de ces niveaux de perturbation ne peut pas s'effectuer à l'aide d'un simple calcul analytique, en raison de la géométrie qui est généralement complexe pour le système que l'on étudie, tel que le champ à l'intérieur d'un cockpit d'avion par exemple. En conséquence, nous sommes contraints d'employer des méthodes numériques, dans le but de pré

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Beckstein, Pascal. "Methodenentwicklung zur Simulation von Strömungen mit freier Oberfläche unter dem Einfluss elektromagnetischer Wechselfelder." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232474.

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Im Bereich der industriellen Metallurgie und Kristallzüchtung treten bei zahlreichen Anwendungen, wo magnetische Wechselfelder zur induktiven Beeinflussung von leitfähigen Werkstoffen eingesetzt werden, auch Strömungen mit freier Oberfläche auf. Das Anwendungsspektrum reicht dabei vom einfachen Aufschmelzen eines Metalls in einem offenen Tiegel bis hin zur vollständigen Levitation. Auch der sogenannte RGS-Prozess, ein substratbasiertes Kristallisationsverfahren zur Herstellung siliziumbasierter Dünnschichtmaterialien, ist dafür ein Beispiel. Um bei solchen Prozessen die Interaktion von Magnetf

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Aydogdu, Elif Can. "Three dimensional heterogeneous finite element method for static multi‐group neutron diffusion." Thesis, 2010. http://hdl.handle.net/10155/116.

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Because current full‐core neutronic‐calculations use two‐group neutron diffusion and rely on homogenizing fuel assemblies, reconstructing pin powers from such a calculation is an elaborate and not very accurate process; one which becomes more difficult with increased core heterogeneity. A three‐dimensional Heterogeneous Finite Element Method (HFEM) is developed to address the limitations of current methods by offering fine‐group energy representation and fuel‐pin‐level spatial detail at modest computational cost. The calculational cost of the method is roughly equal to the calculational cost o

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Mauch, Sean Patrick. "Efficient Algorithms for Solving Static Hamilton-Jacobi Equations." Thesis, 2003. https://thesis.library.caltech.edu/1888/1/thesis.pdf.

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<p>We present an algorithm for computing the closest point transform to an explicitly described manifold on a rectilinear grid in low dimensional spaces. The closest point transform finds the closest point on a manifold and the Euclidean distance to a manifold for the points in a grid. We consider manifolds composed of simple geometric shapes, such as, a set of points, piecewise linear curves or triangle meshes. The algorithm solves the eikonal equation |grad u| = 1 with the method of characteristics. For many problems, the computational complexity of the algorithm is linear in both the nu

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Yan, Rong-June, and 顏榮俊. "Instantaneous and Static Analysis of Planar Multi-loop Linkages Using Loop Equations." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/38678164008747372501.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>91<br>Methods developed using loop equations are proposed to investigate the instantaneous kinematics, statics, and dynamics of complex planar mechanisms. The rank of the coefficient matrix of loop equations is used to check if a mechanism is at an unstable configuration or all the instantaneous centers of the mechanism can be found. The solution of the loop equations are used to (i) find all the instantaneous centers; (ii) find the angular velocity of each link and the velocity of each point; (iii) develop the equations for static analysis; (iv) develop dynamic equa

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