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Thèses sur le sujet « Structures »

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1

Guy, Nicolas. "Modèle et commande structurés : application aux grandes structures spatiales flexibles." Thesis, Toulouse, ISAE, 2013. http://www.theses.fr/2013ESAE0036/document.

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Dans cette thèse, les problématiques de la modélisation et du contrôle robuste de l’attitude des grandes structures spatiales flexibles sont considérées. Afin de satisfaire les performances de pointage requises dans les scénarios des futures missions spatiales, nous proposons d’optimiser directement une loi de commande d’ordre réduit sur un modèle de validation d’ordre élevé et des critères qui exploitent directement la structure du modèle. Ainsi, les travaux de cette thèse sont naturellement divisés en deux parties : une partie relative à l’obtention d’un modèle dynamique judicieusement struc
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2

Sibai, Munira. "Optimization of an Unfurlable Space Structure." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99908.

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Deployable structures serve a large number of space missions. They are vital since spacecraft are launched by placing them inside launch vehicle payload fairings of limited volume. Traditional spacecraft design often involves large components. These components could have power, communication, or optics applications and include booms, masts, antennas, and solar arrays. Different stowing methods are used in order to reduce the overall size of a spacecraft. Some examples of stowing methods include simple articulating, more complex origami inspired folding, telescoping, and rolling or wrapping. Wr
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3

Keyhani, Ali. "A Study On The Predictive Optimal Active Control Of Civil Engineering Structures." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/223.

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Uncertainty involved in the safe and comfort design of the structures is a major concern of civil engineers. Traditionally, the uncertainty has been overcome by utilizing various and relatively large safety factors for loads and structural properties. As a result in conventional design of for example tall buildings, the designed structural elements have unnecessary dimensions that sometimes are more than double of the ones needed to resist normal loads. On the other hand the requirements for strength and safety and comfort can be conflicting. Consequently, an alternative approach for design of
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4

Keyhani, Ali. "A Study On The Predictive Optimal Active Control Of Civil Engineering Structures." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/223.

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Uncertainty involved in the safe and comfort design of the structures is a major concern of civil engineers. Traditionally, the uncertainty has been overcome by utilizing various and relatively large safety factors for loads and structural properties. As a result in conventional design of for example tall buildings, the designed structural elements have unnecessary dimensions that sometimes are more than double of the ones needed to resist normal loads. On the other hand the requirements for strength and safety and comfort can be conflicting. Consequently, an alternative approach for design of
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5

Peters, David W. "Design of diffractive optical elements through low-dimensional optimization." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/54614.

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The simulation of diffractive optical structures allows for the efficient testing of a large number of structures without having to actually fabricate these devices. Various forms of analysis of these structures have been done through computer programs in the past. However, programs that can actually design a structure to perform a given task are very limited in scope. Optimization of a structure can be a task that is very processor time intensive, particularly if the optimization space has many dimensions. This thesis describes the creation of a computer program that is able to find an optima
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6

Plessas, Spyridon D. "Fluid-structure interaction in composite structures." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/41432.

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Approved for public release; distribution is unlimited.<br>In this research, dynamic characteristics of polymer composite beam and plate structures were studied when the structures were in contact with water. The effect of fluid-structure interaction (FSI) on natural frequencies, mode shapes, and dynamic responses was examined for polymer composite structures using multiphysics-based computational techniques. Composite structures were modeled using the finite element method. The fluid was modeled as an acoustic medium using the cellular automata technique. Both techniques were coupled so that
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7

Carpentier, Mathilde. "Méthodes de détection des similarités structurales : caractérisation des motifs conservés dans les familles de structures pour l' annotation des génomes." Paris 6, 2005. http://www.theses.fr/2005PA066571.

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8

Edrees, Tarek. "Structural Identification of Civil Engineering Structures." Licentiate thesis, Luleå tekniska universitet, Byggkonstruktion och -produktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26719.

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The assumptions encountered during the analysis and design of civil engineering structures lead to a difference in the structural behavior between calculations based models and real structures. Moreover, the recent approach in civil engineering nowadays is to rely on the performance-based design approaches, which give more importance for durability, serviceability limit states, and maintenance.Structural identification (St-Id) approach was utilized to bridge the gap between the real structure and the model. The St-Id procedure can be utilized to evaluate the structures health, damage detection
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9

BABAEI, IMAN. "Structural Testing of Composite Crash Structures." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2910072.

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10

Rasmussen, Kim J. R. "Stability of thin-walled structural members and systems." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/18194.

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This DEng thesis consists of 83 articles containing research material on the stability of thin-walled structural members and systems with emphasis on metal structures. Metal structures are used widely in the construction industry. They include structural members and frames made from rolled and fabricated steel, cold-formed steel, stainless steel and aluminium. Common to these products is the desire to minimise the cross-sectional area to reduce weight and cost. Structural cross-sections are therefore thin-walled and prone to buckling, and an overriding consideration in the design of metal str
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11

Lee, Seung-Yoon. "Geometrically exact modeling and nonlinear mechanics of highly flexible structures /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3074421.

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12

Denli, Huseyin. "Structural-acoustic optimization of composite sandwich structures." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 168 p, 2007. http://proquest.umi.com/pqdlink?did=1251904511&Fmt=7&clientId=79356&RQT=309&VName=PQD.

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13

Naseer, Abeer. "Structural studies of higher order DNA structures." Thesis, University of Reading, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515807.

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14

Yahathugoda, B. P. S. Dilruk. "Structural mechanics of plain knitted elastomeric structures." Thesis, University of Manchester, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607626.

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Considerable interest has developed recently in 'stretch' and 'power' fabrics and their component yams. Stretch fabrics are finding applications in areas such as medical compression therapy, support for back, knee and ankle, and in prosthetics. These stretch fabrics can be made by either knitting or weaving; knitted structures are widely used as stretch fabrics due to their inherent elasticity, drapability and the relative ease of fabrication with stretchable yams. Therefore, the present research work deals with the development of comprehensive mechanical models to predict the mechanical prope
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15

ZHANG, Jingyao. "STRUCTURAL MORPHOLOGY AND STABILITY OF TENSEGRITY STRUCTURES." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/49132.

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学位授与大学:京都大学 ; 取得学位: 博士(工学) ; 学位授与年月日: 2007-09-25 ; 学位の種類: 新制・課程博士 ; 学位記番号: 工博第2856号 ; 請求記号: 新制/工/1420 ; 整理番号: 25541<br>Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第13385号<br>工博第2856号<br>新制||工||1420(附属図書館)<br>25541<br>UT51-2007-Q786<br>京都大学大学院工学研究科建築学専攻<br>(主査)教授 加藤 直樹, 教授 上谷 宏二, 准教授 大﨑 純<br>学位規則第4条第1項該当
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16

Zedek, Nadia. "Complex ownership structures, banks' capital structure and performance." Thesis, Limoges, 2014. http://www.theses.fr/2014LIMO0005/document.

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Cette thèse examine l’impact de la structure actionnariale sur la structure du capital et la performance des banques commerciales européennes sur la période 2002-2010. Elle est composée de trois essais empiriques. Le premier chapitre teste l'effet de la divergence entre les droits de contrôle et les droits pécuniaires d'un actionnaire ultime sur l’ajustement du ratio du capital à son niveau optimal et sur l’offre de crédit par les banques. Les résultats montrent qu’en présence de divergence entre les droits de contrôle et les droits pécuniaires, les banques n’émettent pas du capital pour augme
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17

Violette, Michael A. "Fluid structure interaction effect on sandwich composite structures." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5533.

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Approved for public release; distribution is unlimited.<br>The objective of this research is to examine the fluid structure interaction (FSI) effect on composite sandwich structures under a low velocity impact. The primary sandwich composite used in this study was a 6.35-mm balsa core and a multi-ply symmetrical plain weave 6 oz E-glass skin. The specific geometry of the composite was a 305 by 305 mm square with clamped boundary conditions. Using a uniquely designed vertical drop-weight testing machine, there were three fluid conditions in which these experiments focused. The first of these co
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18

Richardson, Mark Damian. "Dynamically installed anchors for floating offshore structures." University of Western Australia. School of Civil and Resource Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0230.

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The gradual depletion of shallow water hydrocarbon deposits has forced the offshore oil and gas industry to develop reserves in deeper waters. Dynamically installed anchors have been proposed as a cost-effective anchoring solution for floating offshore structures in deep water environments. The rocket or torpedo shaped anchor is released from a designated drop height above the seafloor and allowed to penetrate the seabed via the kinetic energy gained during free-fall and the anchor’s self weight. Dynamic anchors can be deployed in any water depth and the relatively simple fabrication and insta
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19

Swanson, Gary D. "Structural efficiency study of composite wing rib structures." Thesis, This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-04292010-020010/.

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20

Liu, Wenjie. "Structural dynamic analysis and testing of coupled structures." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246801.

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21

Yang, Nana. "Structural strength and reliability analysis of composite structures." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=13242.

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22

Bennett, J. E. "Structural and compositional studies of novel ribbon structures." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596574.

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This thesis documents the results of a structural and compositional study of selected mixed metal oxides possessing novel structures based upon 'ribbons' of corner sharing metal-oxygen octahedra. The techniques employed to characterise the specimens of interest have included Powder X-ray Diffraction (PXRD). High Resolution Transmission Electron Microscopy (HRTEM) and Energy Dispersive X-ray Spectroscopy (EDS). Compositional analysis of specimens containing strontium, lanthanum and titanium has been achieved to a high degree of accuracy using EDS analysis in the electron microscope. A mathemati
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23

Dawood, Tariq Ali. "Structural health monitoring of GFRP sandwich beam structures." Thesis, University of Southampton, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438529.

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24

Samad, Abdus. "Structural and magnetic properties of spin valve structures." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624580.

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25

Edrees, Tarek. "Structural Control and Identification of Civil Engineering Structures." Doctoral thesis, Luleå tekniska universitet, Byggkonstruktion och -produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18700.

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In general, the main purpose of a structural control system is to apply powerful control techniques that improve the behaviour of civil structures under various kinds of dynamic loading. The first part of this thesis presents novel applications of posicast and input shaping control schemes that have never previously been applied in the field of structural control. Numerical simulations of a benchmark three-story building with an MR damper are used to verify the efficiency of the proposed control theories. The superiority and effectiveness of the suggested schemes at reducing the structure’s re
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26

Ullah, Israr. "Vibration-based structural health monitoring of composite structures." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/vibrationbased-structural-health-monitoring-of-composite-structures(f21abb03-5b46-4640-9447-0552d5e0c7d6).html.

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Composite materials are in use in several applications, for example, aircraft structural components, because of their light weight and high strength. However the delamination which is one of the serious defects often develops and propagates due to vibration during the service of the structure. The presence of this defect warrants the design life of the structure and the safety. Hence the presence of such defect has to be detected in time to plan the remedial action well in advance. There are a number of methods in the literature for damage detection. They are either 'baseline free/reference fr
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27

Shafieezadeh, Abdollah. "Application Of Structural Control For Civil Engineering Structures." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/142.

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This study presents the application of control methods in seismic mitigation of structural responses. The study consists of two parts. In the first section, fractional order filters are utilized to enhance the performance of the conventional LQR method for optimal robust control of a simple civil structure. The introduced filters modify the state variables fed back to the constant gain controller. Four combinations of fractional order filter and LQR are considered and optimized based on a new performance criterion defined in the paper. Introducing fractional order filters is shown to improve t
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28

Yi, Ding. "Multiscale modeling structure and super structures of dendronized polymers /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18126.

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29

Gangopadhyay, Subhashis. "Growth, surface structure and morphology of semiconductor nano-structures." [S.l.] : [s.n.], 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=980582946.

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30

Isaksson, Jonas, and Mathias Werborg. "Jämförelse mellan BIM­­-verktygen Revit Structure och Tekla Structures." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Byggnadsteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-16011.

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31

O'Connor, Joseph. "Fluid-structure interactions of wall-mounted flexible slender structures." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/fluidstructure-interactions-of-wallmounted-flexible-slender-structures(1dab2986-b78f-4ff9-9b2e-5d2181cfa009).html.

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The fluid-structure interactions of wall-mounted slender structures, such as cilia, filaments, flaps, and flags, play an important role in a broad range of physical processes: from the coherent waving motion of vegetation, to the passive flow control capability of hair-like surface coatings. While these systems are ubiquitous, their coupled nonlinear response exhibits a wide variety of behaviours that is yet to be fully understood, especially when multiple structures are considered. The purpose of this work is to investigate, via numerical simulation, the fluid-structure interactions of arrays
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32

Tidei, Carina. "G-structures projective et conforme et leur structure BRS." Phd thesis, Aix-Marseille 2, 2009. http://theses.univ-amu.fr.lama.univ-amu.fr/2009AIX22062.pdf.

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Cette étude propose une application innovante de deux concepts très étudiés par la communauté mathématique, le fibré des k-repères et la connaxion de Cartan. D'une part, l'utilisation d'une connexion de Cartan particulière sur le fibré des 2-repères nous permet de proposer une généralisation de la notion de dérivée de Schwarz en dimension arbitraire, pour les difféomorphismes projectifs et conformes. D'une part, nous avons pu élaborer une structure de BRS permettant de reproduire infinitésimalement l'action des difféomorphismes sur des champs de jauge à un terme de courbure près. Ainsi, la not
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33

Charley, Jacques. "Dynamique de structures complexes hydroacoustique et couplage fluide-structure." [S.l.] : [S.n.], 2001. http://www.univ-lille1.fr/bustl-grisemine/pdf/extheses/50376-2001-127-128.pdf.

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34

Finkelman, Janis. "Structures." Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/2493.

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In my artistic practice, I have defined the term “disorder” to mean a disturbance in established patterns, structures, or balances. I have defined the term “structure” to be an arrangement of constituents that results in a unified whole. I have defined “energy” to mean forces which either activate or are active upon entities. I seek to generate imagery that investigates relationships between disorder, structure, and energy.
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35

Tugilimana, Alexis. "Optimal design of lightweight modular structures." Doctoral thesis, Universite Libre de Bruxelles, 2018. https://dipot.ulb.ac.be/dspace/bitstream/2013/283383/3/content.pdf.

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This PhD thesis addresses the development of novel computational methods for designing modular structures i.e. structures composed of the assembly of identical components called modules. Current methodologies tackle this challenge by implementing topology optimization of the module but their efficiency is limited by the performance deterioration when numerous modules are used in the structure. In this work, the design of lightweight modular structures is addressed by simultaneously optimizing the topology of the modules and their respective position in the structure. This contribution also inc
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Wang, Zhuozhi. "Finding common structures among RNA secondary structures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq30832.pdf.

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Guinand, Gérard. "Structures de structures de systèmes anthracéniques complexants." Bordeaux 1, 1986. http://www.theses.fr/1986BOR10526.

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38

Lannamann, Daniel L. "Structural health monitoring : numerical damage predictor for composite structures." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA390997.

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Nayyerloo, Mostafa. "Real-time Structural Health Monitoring of Nonlinear Hysteretic Structures." Thesis, University of Canterbury. Department of Mechanical Engineering, 2011. http://hdl.handle.net/10092/6581.

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The great social and economic impact of earthquakes has made necessary the development of novel structural health monitoring (SHM) solutions for increasing the level of structural safety and assessment. SHM is the process of comparing the current state of a structure’s condition relative to a healthy baseline state to detect the existence, location, and degree of likely damage during or after a damaging input, such as an earthquake. Many SHM algorithms have been proposed in the literature. However, a large majority of these algorithms cannot be implemented in real time. Therefore, their result
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40

Bruun, Karianne. "Structural Dynamics of Subsea Structures in Earthquake Prone Regions." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24328.

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Med utviklingen som har funnet sted innenfor den norske oljebransjen de siste &#229;rene har b&#229;de teknologien og utfordringene blitt mer komplekse. Subsea-operasjoner har blitt mer vanlig og gir utslag i at det p&#229; havbunnen i mange felt er sammenkoblede systemer av konstruksjoner. I relasjon til seismisk aktivitet reises da sp&#248;rsm&#229;let om disse systemene med br&#248;nner, r&#248;r og andre konstruksjoner kan t&#229;le &#229; bli utsatt for et jordskjelv av en viss st&#248;rrelse. For &#229; ta et steg i retningen av &#229; besvare dette sp&#248;rsm&#229;let, dreier denne hov
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41

Eksik, Ömer. "Structural performance of GRP top hat stiffened marine structures." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431952.

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42

Kirikera, Goutham Raghavendra. "A Structural Neural System for Health Monitoring of Structures." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155149869.

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Islami, Kleidi. "System identification and structural health monitoring of bridge structures." Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423079.

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This research study addresses two issues for the identification of structural characteristics of civil infrastructure systems. The first one is related to the problem of dynamic system identification, by means of experimental and operational modal analysis, applied to a large variety of bridge structures. Based on time and frequency domain techniques and mainly with output-only acceleration, velocity or strain data, modal parameters have been estimated for suspension bridges, masonry arch bridges, concrete arch and continuous bridges, reticular and box girder steel bridges. After giving an in-
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44

Saeed, Kashif. "Contribution à la surveillance de l'intégrité de structures." Paris, ENSAM, 2010. http://www.theses.fr/2010ENAM0024.

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La mise en place de la surveillance de l'intégrité des structures comprend les étapes de modélisation, d'identification, d'extraction des caractéristiques et de développement d'un modèle statistique. L'objectif de cette thèse est de développer une approche intégrée regroupant ces étapes et d'élaborer une stratégie de validation en utilisant un simulateur à éléments finis. Dans cette finalité, nous avons d'abord élaboré une me��thode globale de modélisation d'une structure comprenant des capteurs piézo-électriques. Ensuite, nous avons choisi la méthode d'identification par sous-espaces pour amé
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45

Song, Yale. "Structured video content analysis : learning spatio-temporal and multimodal structures." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90003.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 141-154).<br>Video data exhibits a variety of structures: pixels exhibit spatial structure, e.g., the same class of objects share certain shapes and/or colors in image; sequences of frames exhibit temporal structure, e.g., dynamic events such as jumping and running have a certain chronological order of frame occurrence; and when combined with audio and text, there is multimodal structure, e
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Miner, andrew S. "Data structures for the analysis of large structured Markov models." W&M ScholarWorks, 2000. https://scholarworks.wm.edu/etd/1539623985.

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High-level modeling formalisms are increasingly popular tools for studying complex systems. Given a high-level model, we can automatically verify certain system properties or compute performance measures about the system. In the general case, measures must be computed using discrete-event simulations. In certain cases, exact numerical analysis is possible by constructing and analyzing the underlying stochastic process of the system, which is a continuous-time Markov chain (CTMC) in our case. Unfortunately, the number of states in the underlying CTMC can be extremely large, even if the high-lev
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47

Imai, Kenichiro, 賢一郎 今井, Naoyuki Asakawa, et al. "Secondary structure breakers and hairpin structures in myoglobin and hemoglobin." Chem-Bio Informatics Society, 2005. http://hdl.handle.net/2237/9271.

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48

Thiriat, Paul. "FLUID-STRUCTURE INTERACTION : EFFECTS OF SLOSHING IN LIQUID-CONTAINING STRUCTURES." Thesis, KTH, Bro- och stålbyggnad, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-125353.

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This report presents the work done within the framework of my master thesis in the program Infrastructure Engineering at KTH Royal Institute of Technology, Stockholm. This project has been proposed and sponsored by the French company Setec TPI, part of the Setec group, located in Paris. The overall goal of this study is to investigate fluid-structure interaction and particularly sloshing in liquid-containing structures subjected to seismic or other dynamic action. After a brief introduction, the report is composed of three main chapters. The first one presents and explains fluid-structure inte
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Wang, Chunlei. "Size and structure effects on the properties of ferroelectric structures." Thesis, University of Essex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336928.

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Maheri, M. R. "Hydrodynamic investigations of cylindrical structures and other fluid-structure systems." Thesis, University of Bristol, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376615.

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