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Dissertations / Theses on the topic 'Reduced Order Method'

Author: Grafiati

Published: 18 April 2022

Last updated: 30 July 2025

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1

Liu, Biheng. "Reduced order models for the analysis of offshore lattice structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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The lattice is a common frame applied in offshore structures benefiting from their economic construction and easily accessible, for example, the jacket platform of the offshore wind turbine. In order to accelerate the design process of a model, this thesis proposed a method to reduce the order of the offshore lattice structure models. The full order model is constructed based on the FEM. Applying the MDOF mass discrete concept lumps the structure mass on each story center. Meanwhile, apply the DSM to determine the displacement and the forces implied on the mass center for accomplishing the uni

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2

Names, Benjamin Joseph. "An Efficient Reduced Order Modeling Method for Analyzing Composite Beams Under Aeroelastic Loading." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71676.

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Composite materials hold numerous advantages over conventional aircraft grade metals. These include high stiffness/strength-to-weight ratios and beneficial stiffness coupling typically used for aeroelastic tailoring. Due to the complexity of modeling composites, designers often select safe, simple geometry and layup schedules for their wing/blade cross-sections. An example of this might be a box-beam made up of 4 laminates, all of which are quasi-isotropic. This results in neglecting more complex designs that might yield a more effective solution, but require a greater analysis effort. The pr

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3

Glenn, Russell David. "A reduced order controller design method based on the Youla parameterization of all stabilizing controllers." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1174396903.

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4

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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5

Malik, Muhammad Haris. "Reduced order modeling for smart grids' simulation and optimization." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/405730.

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This thesis presents the study of the model order reduction for power grids and transmission networks. The specific focus has been the transient dynamics. A mathematical viewpoint has been adopted for model reduction. Power networks are huge and complex network, simulation for power grid analysis and design require large non-linear models to be solved. In the context of developing "Smart Grids" with the distributed generation of power, real time analysis of complex systems such as these needs fast, reliable and accurate models. In the current study we propose model order reduction methods both

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6

Tan, Yong Kwang Alex. "Reduced basis method for 2nd order wave equation : application to one-dimensional seismic problem." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/39209.

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Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2006.<br>MIT Institute Archives copy: pages 93 and 94 bound in reverse order.<br>Includes bibliographical references (p. 93-95).<br>In this thesis, we solve the 2nd order wave equation, which is hyperbolic and linear in nature, to determine the pressure distribution for a one-dimensional seismic problem with smooth initial pressure and rate of pressure change with time. With Dirichlet and Neumann boundary conditions, the pressure distribution is solved for a total of 500 time steps, which is

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7

Di, Donfrancesco Fabrizio. "Reduced Order Models for the Navier-Stokes equations for aeroelasticity." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS603.

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Le coût d’une simulation numérique aéroélastique peut devenir trop onéreuse lorsque une analyse paramétrique à haut fidélité est requise. Dans ce contexte, des Modèles d'Ordre Réduit (MOR) ont été développés en vue de réduire le coût de calcul des simulations numériques en préservant un haut niveau de précision. Ce travail de thèse porte sur la construction d'un MOR pour les équations de Navier-Stokes en tenant compte d'un maillage déformable dans le cas d'une application aéroélastique. Une base modale pour l'écoulement est obtenue via la Décomposition Orthogonale aux valeurs propres et une pr

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8

Arkalgud, Ravi. "Vortex shedding analysis and control using reduced order modelling and viscous cell boundary element method." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274099.

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9

Wahl, Jean-Baptiste. "The Reduced basis method applied to aerothermal simulations." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD024/document.

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Nous présentons dans cette thèse nos travaux sur la réduction d'ordre appliquée à des simulations d'aérothermie. Nous considérons le couplage entre les équations de Navier-Stokes et une équations d'énergie de type advection-diffusion. Les paramètres physiques considérés nous obligent à considéré l'introduction d'opérateurs de stabilisation de type SUPG ou GLS. Le but étant d'ajouter une diffusion numérique dans la direction du champs de convection, afin de supprimer les oscillations non-phyisques. Nous présentons également notre stratégie de résolution basée sur la méthode des bases réduite (R

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10

Kasnakoglu, Cosku. "Reduced order modeling, nonlinear analysis and control methods for flow control problems." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1195629380.

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11

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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12

Zhao, Xiaopeng. "Modeling and Simulation of MEMS Devices." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11227.

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The objective of this dissertation is to present a modeling and simulation methodology for MEMS devices and identify and understand the associated nonlinearities due to large deflections, electric actuation, impacts, and friction. In the first part of the dissertation, we introduce a reduced-order model of flexible microplates under electric excitation. The model utilizes the von Karman plate equations to account for geometric nonlinearities due to large plate deflections. The Galerkin approach is employed to reduce the partial-differential equations of motion and associated boundary conditio

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13

Gao, Haotian. "POD-Galerkin based ROM for fluid flow with moving boundaries and the model adaptation in parametric space." Diss., Kansas State University, 2018. http://hdl.handle.net/2097/38776.

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Doctor of Philosophy<br>Department of Mechanical and Nuclear Engineering<br>Mingjun Wei<br>In this study, a global Proper Orthogonal Decomposition (POD)-Galerkin based Reduced Order model (ROM) is proposed. It is extended from usual fixed-domain problems to more general fluid-solid systems with moving boundaries/interfaces. The idea of the extension is similar to the immersed boundary method in numerical simulations which uses embedded forcing terms to represent boundary motions and domain changes. This immersed boundary method allows a globally defined fixed domain including both fluid and so

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14

May, David. "The TLC Method for Modeling Creep Deformation and Rupture." Honors in the Major Thesis, University of Central Florida, 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1620.

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This thesis describes a novel new method, termed the Tangent-Line-Chord (TLC) method, that can be used to more efficiently model creep deformation dominated by the tertiary regime. Creep deformation is a widespread mechanical mode of failure found in high-stress and temperature mechanical systems. To accurately simulate creep and its effect on structures, researchers utilize finite element analysis (FEA). General purpose FEA packages require extensive amounts of time and computer resources to simulate creep softening in components because of the large deformation rates that continuously evolve

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15

Phalippou, Pierre. "Data-enabled, reduced-order simulation of dynamical systems with application to vehicle crash simulation." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2544.

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Lors de la conception de nouveaux véhicules, les constructeurs automobiles font face à de nombreuses contraintes telles que la sécurité, le confort, le poids et la consommation de carburant. La simulation numérique, et plus précisément la méthode des éléments finis, y est très largement utilisée car elle permet de tester l'influence des différents paramètres sur le comportement du système. Ainsi, de nombreux tests réels sur prototypes sont évités. La conception de nouveaux véhicules est néanmoins ralentie par l'utilisation de modèles de plus en plus complexes, en particulier dans les applicati

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16

Neumann, Sönke [Verfasser], and Norbert [Akademischer Betreuer] Hoffmann. "Fluid-structure interaction of flexible lifting bodies with multi-body dynamics of order-reduced models and the actuator-line method / Sönke Neumann. Betreuer: Norbert Hoffmann." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2016. http://d-nb.info/1091059357/34.

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17

Bott, Stefanie Marita [Verfasser]. "Adaptive SQP Method with Reduced Order Models for Optimal Control Problems with Constraints on the State Applied to the Navier-Stokes Equations / Stefanie Marita Bott." München : Verlag Dr. Hut, 2016. http://d-nb.info/1084385538/34.

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18

Zanon, Lorenzo [Verfasser], Karen [Akademischer Betreuer] Veroy-Grepl, and Gianluigi [Akademischer Betreuer] Rozza. "Model order reduction for nonlinear elasticity: applications of the reduced basis method to geometrical nonlinearity and finite deformation / Lorenzo Zanon ; Karen Veroy-Grepl, Gianluigi Rozza." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1162498293/34.

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19

Zhang, Wenxian. "Direct sensitivity techniques in regional air quality models: development and application." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52941.

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Sensitivity analysis based on a chemical transport model (CTM) serves as an important approach towards better understanding the relationship between trace contaminant levels in the atmosphere and emissions, chemical and physical processes. Previous studies on ozone control identified the high-order Decoupled Direct Method (HDDM) as an efficient tool to conduct sensitivity analysis. Given the growing recognition of the adverse health effects of fine particulate matter (i.e., particles with an aerodynamic diameter less than 2.5 micrometers (PM2.5)), this dissertation presents the development of

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20

Monticelli, Guilherme Cepellos. "Análise dinâmica não linear bidimensional local de risers em catenária considerando contato unilateral viscoelástico." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-26062014-210839/.

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O estudo da dinâmica estrutural de risers oceânicos apresenta instigantes desafios aos pesquisadores da área da engenharia de estruturas, uma vez que os meios tradicionais de análises dinâmicas lineares nem sempre se ajustam às suas complexas particularidades. No atual estágio do desenvolvimento científico da área de engenharia de estruturas, a aplicação de técnicas de análise dinâmica não linear, dentro de determinadas hipóteses, mostra-se como uma das alternativas possíveis e viáveis à tradicional análise dinâmica linear. Com vistas a uma nova abordagem do problema, o presente trabalho adota

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21

Larson, Rudolph Scott. "Computationally Efficient Modeling of Transient Radiation in a Purely Scattering Foam Layer." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1871.pdf.

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22

Capaldo, Matteo. "A new approximation framework for PGD-based nonlinear solvers." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN011/document.

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Le but de ce travail est d'introduire un cadre d'approximation, la Reference Points Method, afin de réduire la complexité de calcul des opérations algébriques lorsqu'elles concernent des approximations à variables séparées dans le cadre de la Proper Generalized Decomposition.La PGD a été introduite dans [1] dans le cadre de la méthode LaTIn pour résoudre efficacement des équations différentielles non linéaires et dépendants du temps en mécanique des structures. La technique consiste à chercher la solution d'un problème dans une base d'ordre réduit (ROB) qui est automatiquement et à la volée gé

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23

Abid, Fatma. "Reduction of coupled field models for the simulation of electrical machines and power electronic modules." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0032/document.

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Dans le domaine automobile, les modules électroniques de puissance des produits mécatroniques voient leur puissance sans cesse s'accroître, tout en étant confinés dans des volumes de plus en plus réduits. Au cours de leur fonctionnement, les composants semi-conducteurs et leur assemblage subissent ainsi des contraintes électro-thermo-mécaniques sévères, susceptibles d'entraîner leur destruction et de provoquer la défaillance du produit. L'étude de la fiabilité et le calcul de la durée de vie de tels produits dépendent des températures de jonction calculées au niveau des puces des composants de

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24

Kolchuzhin, Vladimir. "Methods and Tools for Parametric Modeling and Simulation of Microsystems based on Finite Element Methods and Order Reduction Technologies." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000550.

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In der vorliegenden Arbeit wird die Entwicklung eines effizienten Verfahrens zur parametrischen Finite Elemente Simulation von Mikrosystemen und zum Export dieser Modelle in Elektronik- und Systemsimulationswerkzeuge vorgestellt. Parametrische FE-Modelle beschreiben den Einfluss von geometrischen Abmessungen, Schwankungen von Materialeigenschaften und veränderten Umgebungsbedingungen auf das Funktionsverhalten von Sensoren und Aktuatoren. Parametrische FE-Modelle werden für die Auswahl geeigneter Formelemente und deren Dimensionierung während des Entwurfsprozesses in der Mikrosystemtechnik ben

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25

Mathis, Allen MATHIS. "Theory and Application of Damping in Jointed Structures." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555940863603165.

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26

Chabot, John Alva. "VALIDATING STEADY TURBULENT FLOW SIMULATIONS USING STOCHASTIC MODELS." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1443188391.

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27

GUARNERA, DANIELE. "Refined one-dimensional models applied to biostructures and fluids." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729363.

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28

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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29

Brown, Jeffrey M. "Reduced Order Modeling Methods for Turbomachinery Design." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1229962254.

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30

Masmoudi, Florent. "Nonintrusive reduced order models." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30363.

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Le but de cette thèse est de construire des modèles réduits permettant de se substituer à des logiciels de simulation de systèmes physiques complexes. Ces modèles réduits devront être rapides à interroger et seront identifiés sur la base d’un nombre limité de calculs issus du logiciel de simulation. Ce travail s’inscrira ainsi dans le monde des méthodes d’apprentissage. Les modèles ainsi créés devront pouvoir être utilisés de manière autonome, sans avoir recours au logiciel de simulation. On s’intéressera principalement à deux types de physiques. Dans une première partie nous définirons une st

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31

Meesala, Vamsi Chandra. "Nonlinear Effects in Contactless Ultrasound Energy Transfer Systems." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101752.

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Ultrasound acoustic energy transfer (UAET) is an emerging contactless technology that offers the capability to safely and efficiently power sensors and devices while eliminating the need to replace batteries, which is of interest in many applications. It has been proposed to recharge and communicate with implanted medical devices, thereby eliminating the need for invasive and expensive surgery and also to charge sensors inside enclosed metal containers typically found in automobiles, nuclear power plants, space stations, and aircraft engines. In UAET, energy is transferred through the receptio

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32

Stoyanov, Miroslav. "Reduced Order Methods for Large Scale Riccati Equations." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/27832.

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Solving the linear quadratic regulator (LQR) problem for partial differential equa- tions (PDEs) leads to many computational challenges. The primary challenge comes from the fact that discretization methods for PDEs typically lead to very large sys- tems of differential or differential algebraic equations. These systems are used to form algebraic Riccati equations involving high rank matrices. Although we restrict our attention to control problems with small numbers of control inputs, we allow for po- tentially high order control outputs. Problems with this structure appear in a number of prac

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33

Eftang, Jens Lohne. "Reduced basis methods for parametrized partial differential equations." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for matematiske fag, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12550.

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34

Hultman, Hugo. "Validation of Forced Response Methods for Turbine Blades." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172144.

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35

Liang, Zongxian. "Computational Analysis of Vortex Structures in Flapping Flight." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1388700948.

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36

Zigic, Dragan. "Homotopy methods for solving the optimal projection equations for the reduced order model problem." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-11242009-020145/.

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37

Pereira, Da Silva Luciano. "Atténuation du bruit et des vibrations de structures minces par dispositifs piézoélectriques passifs : modèles numériques d'ordre réduit et optimisation." Thesis, Paris, CNAM, 2014. http://www.theses.fr/2015CNAM0944/document.

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Dans le cadre de la lutte contre les nuisances sonores et vibratoires, cette thèse porte sur la modélisation numérique des structures amorties par dispositifs piézoélectriques shuntés. La première partie du travail concerne la modélisation par éléments finis de structures en vibrations avec des pastilles piézoélectriques shuntées. Dans un premier temps, une formulation éléments finis originale, qui utilise des variables électriques globales (différence de potentiel et charge dans chaque pastille piézoélectrique), est analysée et validée. Dans un second temps, différentes stratégies de réductio

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Zhang, Yuqing. "Fixed-time algebraic distributed state estimation for linear systems." Electronic Thesis or Diss., Bourges, INSA Centre Val de Loire, 2025. http://www.theses.fr/2025ISAB0001.

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Au cours des dernières décennies, le déploiement massif de capteurs embarqués en réseau dotés des capacités de communication dans des systèmes à grande échelle a suscité un intérêt croissant de la part des chercheurs dans le domaine de l’estimation distribuée. Cette thèse vise à développer une méthode d’estimation d’état distribuée algébrique à temps fixe pour les systèmes linéaires à temps variant d’ordre entier et les systèmes linéaires à temps invariant d’ordre fractionnaire dans des environnements bruités, en concevant un ensemble d’estimateurs locaux d’ordre réduit au niveau des capteurs

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Richardson, Brian Ross. "A reduced-order model based on proper orthogonal decomposition for non-isothermal two-phase flows." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2623.

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Braun, Mathias. "Reduced Order Modelling and Uncertainty Propagation Applied to Water Distribution Networks." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0050/document.

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Les réseaux de distribution d’eau consistent en de grandes infrastructures réparties dans l’espace qui assurent la distribution d’eau potable en quantité et en qualité suffisantes. Les modèles mathématiques de ces systèmes sont caractérisés par un grand nombre de variables d’état et de paramètres dont la plupart sont incertains. Les temps de calcul peuvent s’avérer conséquents pour les réseaux de taille importante et la propagation d’incertitude par des méthodes de Monte Carlo. Par conséquent, les deux principaux objectifs de cette thèse sont l’étude des techniques de modélisation à ordre rédu

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Ramos, Alberto Gil Couto Pimentel. "Numerical solution of Sturm–Liouville problems via Fer streamers." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/256997.

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The subject matter of this dissertation is the design, analysis and practical implementation of a new numerical method to approximate the eigenvalues and eigenfunctions of regular Sturm–Liouville problems, given in Liouville’s normal form, defined on compact intervals, with self-adjoint separated boundary conditions. These are classical problems in computational mathematics which lie on the interface between numerical analysis and spectral theory, with important applications in physics and chemistry, not least in the approximation of energy levels and wave functions of quantum systems. Because

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Schmidt, Andreas [Verfasser], and Hans Georg [Akademischer Betreuer] Bock. "Direct Methods for PDE-Constrained Optimization Using Derivative-Extended POD Reduced-Order Models / Andreas Schmidt ; Betreuer: Hans Georg Bock." Heidelberg : Universitätsbibliothek Heidelberg, 2014. http://d-nb.info/118030070X/34.

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Fjellstedt, Christoffer. "Methods for including stiffness parameters from reduced finite element models in simulations of multibody systems." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-387499.

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Two methods using lumped element (lumped parameter) methods to model flexible bodies have been presented. The methods are based on the concept of using a Guyan reduced stiffness matrix to describe the elasticity of a body. The component to be modeled has been divided into two parts using FE software and the mass and inertia tensor for the respective part of the component have been retrieved. The first method has been based on including the elements from the stiffness matrix in compliant constraints. The compliant constraints have been derived and a prototype has been implemented in MATLAB. It

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Riffaud, Sébastien. "Modèles réduits : convergence entre calcul et données pour la mécanique des fluides." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0334.

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L'objectif de cette thèse est de réduire significativement le coût de calcul associé aux simulations numériques gouvernées par des équations aux dérivées partielles. Dans ce but, nous considérons des modèles dits "réduits", dont la construction consiste typiquement en une phase d'apprentissage, au cours de laquelle des solutions haute-fidélité sont collectées pour définir un sous-espace d'approximation de faible dimension, et une étape de prédiction, qui exploite ensuite ce sous-espace d'approximation conduit par les données afin d'obtenir des simulations rapides voire en temps réel. La premiè

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Savas, Berkant. "Algorithms in data mining using matrix and tensor methods." Doctoral thesis, Linköpings universitet, Beräkningsvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11597.

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In many fields of science, engineering, and economics large amounts of data are stored and there is a need to analyze these data in order to extract information for various purposes. Data mining is a general concept involving different tools for performing this kind of analysis. The development of mathematical models and efficient algorithms is of key importance. In this thesis we discuss algorithms for the reduced rank regression problem and algorithms for the computation of the best multilinear rank approximation of tensors. The first two papers deal with the reduced rank regression problem,

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Hoareau, Christophe. "Vibrations hydroélastiques de réservoirs élastiques couplés à un fluide interne incompressible à surface libre autour d’un état précontraint." Thesis, Paris, CNAM, 2019. http://www.theses.fr/2019CNAM1241/document.

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Cette thèse de doctorat porte sur le calcul par la méthode des éléments finis du comportement dynamique de réservoirs élastiques précontraints contenant un liquide interne à surface libre. Nous considérons que la pression hydrostatique exercée par le fluide interne incompressible sur les parois flexibles du réservoir est à l’origine de grands déplacements, conduisant ainsi à un état d’équilibre non-linéaire géométrique. Le changement de raideur lié à cet état précontraint induit un décalage des fréquences de résonances du problème de vibrations linéaires couplées.L’objectif principal du travai

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47

Mayorca, María Angélica. "Development and Validation of a Numerical Tool for theAeromechanical Design of Turbomachinery." Licentiate thesis, KTH, Energy Technology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11992.

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<p>In aeromechanical design one of the major rules is to operate under High Cyclic Fatigue (HCF) margins and away from flutter. The level of dynamic excitations and risk of HCF can be estimated by performing forced response analyses from blade row interaction forces or Low Engine Order (LEO) excitation mechanisms. On the other hand, flutter stability prediction can be assessed by calculation of aerodynamic damping forces due to blade motion. In order to include these analyses as regular practices in an industrial aeromechanical design process, interaction between the fields of fluid and struct

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48

Mayorca, María Angélica. "Development and Validation of a Numerical Tool for the Aeromechanical Design of Turbomachinery." Licentiate thesis, KTH, Kraft- och värmeteknologi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11992.

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Abstract:

In aeromechanical design one of the major rules is to operate under High Cyclic Fatigue (HCF) margins and away from flutter. The level of dynamic excitations and risk of HCF can be estimated by performing forced response analyses from blade row interaction forces or Low Engine Order (LEO) excitation mechanisms. On the other hand, flutter stability prediction can be assessed by calculation of aerodynamic damping forces due to blade motion. In order to include these analyses as regular practices in an industrial aeromechanical design process, interaction between the fields of fluid and structura

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49

Gerges, Youssef. "Méthodes de réduction de modèles en vibroacoustique non-linéaire." Phd thesis, Université de Franche-Comté, 2013. http://tel.archives-ouvertes.fr/tel-00933423.

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Les structures soumises à des vibrations sont rencontrées dans diverses applications. Dans denombreux cas, elles sont de nature linéaires, mais quand les amplitudes des oscillations deviennentimportantes, cela provoque un comportement non-linéaire. Par ailleurs, les oscillations desstructures dans un milieu fluide entrainent une interaction fluide-structure. Cette thèse porte surla modélisation du problème fluide-structure non-linéaire. Les cas de non-linéarités étudiés sont lanon-linéarité grands-déplacements caractéristique des structures minces, la non-linéarité localiséegéométrique décriva

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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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