Tesi sul tema "Active structures"
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Toews, von Riesen Eduard. "Active hyperhelical structures". Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612458.
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.
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.
Ulker, Fatma Demet. "Active Vibration Control Of Smart Structures". Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/4/1098409/index.pdf.
control strategies in order to suppress the free and forced vibrations of smart structures. The smart structures analyzed in this study were the smart beam and the smart ¯
n. They were aluminum passive structures with surface bonded PZT (Lead-Zirconate-Titanate) patches. The structures were considered in clamped-free con¯
guration. The ¯
rst part of this study focused on the identi¯
cation of nominal system models of the smart structures from the experimental data. For the experimentally identi¯
ed models the robust controllers were designed by using H1 and ¹
-synthesis strategies. In the second part, the controller implementation was carried out for the suppression of free and forced vibrations of the smart structures. Within the framework of this study, a Smart Structures Laboratory was established in the Aerospace Engineering Department of METU. The controller implementations were carried out by considering two di®
erent experimental set-ups. In the ¯
rst set-up the controller designs were based on the strain measurements. In the second approach, the displacement measurements, which were acquired through laser displacement sensor, were considered in the controller design. The ¯
rst two °
exural modes of the smart beam were successfully controlled by using H1 method. The vibrations of the ¯
rst two °
exural and ¯
rst torsional modes of the smart ¯
n were suppressed through the ¹
-synthesis. Satisfactory attenuation levels were achieved for both strain measurement and displacement measurement applications.
Chang, Min-Yung. "Active vibration control of composite structures". Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-09162005-115021/.
Pennington, Philip Nigel. "Active integrated optic waveguide/laser structures". Thesis, University of Bath, 1989. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760599.
Maldonado-Mercado, Julio Cesar. "Passive and active control of structures". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36654.
Includes bibliographical references (leaves 94-98).
by Julio Cesar Maldonado-Mercado.
M.S.
Tsai, Frank J. (Frank Jin-Fong) 1976. "Distributed active control for tension structures". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/81544.
Scruggs, Jeffrey. "Active, Regenerative Control of Civil Structures". Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/34332.
Master of Science
Maillard, Julien. "Advanced Time Domain Sensing For Active Structural Acoustic Control". Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30335.
Ph. D.
Ewing, Cameron. "Semi-active management of blast load structural response". Thesis, University of Canterbury. Mechanical Engineering, 2007. http://hdl.handle.net/10092/1225.
Matheu, Enrique E. "Active and Semi-Active Control of Civil Structures under Seismic Excitation". Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30310.
Ph. D.
Khan, Irfan Ullah. "Vibration suppression in flexible structures using hybrid active and semi-active control". Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/17682/.
Kim, Sangcheol. "Fabrication of active and passive terahertz structures". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 60 p, 2006. http://proquest.umi.com/pqdweb?did=1203570961&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Piefort, Vincent. "Finite element modelling of piezoelectric active structures". Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211645.
Berlin, Andrew A. "Towards Intelligent Structures: Active Control of Buckling". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/6768.
Baumann, Martin J. "Xyloglucan-active enzymes : properties, structures and applications". Doctoral thesis, Stockholm : Bioteknologi, KTH, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4314.
Rentzos, Panagiotis. "Active vibration control of civil engineering structures". Thesis, City University London, 2007. http://openaccess.city.ac.uk/8571/.
Tsakalotos, Orestis I. "Active control of flexible structures and manipulators". Thesis, University of Newcastle Upon Tyne, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316255.
Hong, Chinsuk. "Active control of resiliently-mounted flexible structures". Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420248.
Perry, David John. "Active CR filter structures using multiple feedback". Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38135.
Hyde, T. Tupper. "Active vibration isolation for precision space structures". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11189.
Blackwood, Gary H. (Gary Howard). "Active vibration isolation for controlled flexible structures". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12204.
Young, Andrew J. "Active control of vibration in stiffened structures". Title page, contents and abstract only, 1995. http://hdl.handle.net/2440/37722.
Thesis (Ph.D.)--Mechanical Engineering, 1995.
Johnson, Martin Eric. "Active control of sound transmission". Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243189.
Yousefi-Koma, Aghil. "Active vibration control of smart structures using piezoelements". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq26875.pdf.
Howard, Carl. "Active isolation of machinery vibration from flexible structures". Title page, abstract and table of contents only, 1999. http://web4.library.adelaide.edu.au/theses/09PH/09phh8478.pdf.
Copy 2 does not have a CD-ROM. Includes bibliographical references (p. 317-330). Also available in an electronic version.
Gummadi, Lakshmana Nagesh Babu. "Active control of delaminations in smart composite structures". Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/13022.
PINTO, OSVALDO CASERES. "ACTIVE NONLINEAR CONTROL OF VIBRATIONS IN FLEXIBLE STRUCTURES". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1999. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1886@1.
FUNDAÇÃO UNIVERSIDADE DO RIO GRANDE
Neste trabalho estuda-se uma estratégia para o controle ativo não-linear de estruturas flexíveis submetidas a carregamentos dinâmicos. O algoritmo de controle é deduzido com base na teoria de controle ótimo não-linear com realimentação de estado, utilizando uma representação tensorial. Desenvolve-se as equações polinomiais de controle para diferentes ordens, partindo-se do controle linear clássico até um controle não-linear de quinta ordem. A estratégia é particularizada para aplicação em sistemas com um grau de liberdade que apresentem não-linearidades quadráticas e cúbicas, que podem representar, de forma aproximada, a maioria dos elementos estruturais encontrados nas Engenharias Civil e Mecânica, tais como vigas, arcos, placas e cascas. Determina-se analiticamente os coeficientes de ganhos até a terceira ordem, e utiliza-se os mesmos para estudar o feito das forças de controle sobre a não- linearidade e estabilidade do sistema. Vários exemplos numéricos de aplicação são apresentados, utilizando-se diferentes tipos de excitação. Uma atenção especial é dedicada a sistemas caracterizados pela coexistência de dois vales potenciais, um deles correspondente a uma posição de equilíbrio pós- flambagem. A influência do sistema de controle sobre a carga de escape é estudada. O efeito do retardo na aplicação das forças de controle é analisado tanto numericamente como analiticamente, utilizando-se o método das múltiplas escalas para desenvolver expressões que permitem encontrar situações críticas de retardo. Como exemplo de aplicação prática, estuda-se o problema de uma viga flambada submetida a um carregamento dinâmico lateral.
The present thesis studies a strategy for the active non- linear control of dynamically loaded flexible structures. The control method is based on the non-linear optimal control theory using state feedback and the solution of the non-linear optimal control problem is obtained by representing system non-linearities and performance indices by power series with the help of algebraic tensor theory. General polynomial representations of the non-linear control law are obtained up to the fifth order. This methodology is applied to systems with quadratic and cubic nonlinearities, capable of representing most of the elements usually used in civil and mechanical engineering structures, such as beams, plates, shells and arcs. Control gains up to the third order are analytically derived and the effect of the control forces on the system is studied. Special emphasis is placed on systems susceptible to chaotic vibrations, escape from a potential well and dynamic jumps. Several examples are provided to illustrate the control approach. Strongly nonlinear systems subjected to free vibration, simple harmonic excitations, impact and ground acceleration are tested. The variation of the dynamic buckling load with the degree of the control algorithms is studied for the problem of structures with two potential wells, one of them corresponding to a post-buckling equilibrium position. The effect of time delay on controlled systems is studied analytically and numerically. The studied methodology is also applied to control the oscillations of simply supported buckled beams, in order to mitigate the effects of dynamic loading on the vibration amplitudes and prevent dangerous instability phenomena.
En este trabajo estudia se una estrategia para el control activo no-lineal de extructuras flexibles sometidas la cargas dinámicas. EL algoritmo de control es deduzido con base en la teoría de control ótimo no lineal con realimentación de estado, utilizando una representación tensorial. Se dearrollan las ecuaciones polinomiales de control para diferentes órdenes, desde el control lineal clásico hasta el control no lineal de quinta orden. Se particulariza la estrategia para la aplicación en sistemas con un grado de liberdad que presenten no linealidades cuadráticas y cúbicas, que pueden representar, de forma aproximada, la mayoría de los elementos extructurales encontrados en las Ingenierías Civil y Mecánica, tales como vigas, arcos y placas. Se determinan analiticamente los coeficientes de ganancias hasta tercer orden, y se utilizan los mismos para estudiar las fuerzas de control sobre la no linealidad y estabilidad del sistema. Varios ejemplos numéricos de aplicación son presentados, utilizando diferentes tipos de excitación. Atención especial se le dedica a los sistemas caracterizados por la coexistencia de dos vales potenciales, uno de ellos correspondiendo a una posición de equilibrio posflameado. Se estudia también la influencia del sistema de control sobre la carga de escape. EL efecto de retardo en la aplicación de las fuerzas de control se anlaiza tanto numérica como analíticamente, utilizando el método de las múltiples escalas para dearrollar expresiones que permiten encontrar situaciones críticas de retardo. Como ejemplo de aplicación práctica, se estudia el problema de una viga flameada sometida a una carga dinámica lateral.
Miller, Scott E. (Scott Edward). "Distributed parameter active vibration control of smart structures". Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/33473.
Gawith, Corin B. E. "Novel active waveguide devices in direct-bonded structures". Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/15488/.
Paupitz, Goncalves Paulo José. "Dynamic analysis and active control of lattice structures". Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/69737/.
Brennan, Michael John. "Active control of waves on one-dimensional structures". Thesis, University of Southampton, 1994. https://eprints.soton.ac.uk/69563/.
Yousefi-Koma, Aghil Carleton University Dissertation Engineering Mechanical and Aerospace. "Active vibration control of smart structures using piezoelements". Ottawa, 1997.
Smith, Jerome P. "Active control of broadband acoustic radiation from structures". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-01242009-063336/.
Hassani, Nezhad Gashti E. (Ehsan). "Thermo-mechanical behaviour of ground-source thermo-active structures". Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526214061.
Tiivistelmä Kasvaneet energiakustannukset ja kiristyneet ympäristösäädökset ovat lisänneet geotermisten energiaratkaisujen suosiota. EU, mukaan lukien Suomi, on asettanut tavoitteekseen lisätä uusiutuvien energialähteiden käyttöä ja vähentää hiilidioksidipäästöjä. Geotermistä energiaa hyödyntävä paaluperustukset, niin kutsutut energiapaalut, tarjoavat uudenlaisen teknologian vähäpäästöisen energian tuottamiseen. Geotermiset lämpöpumppujärjestelmät, maalämpöpumput, ovat taloudellisia ja ympäristöystävällisiä energiantuotantomenetelmiä, jotka talviaikaan siirtävät maaperään varastoitunutta energiaa rakennuksen lämmittämiseen ja vastaavasti jäähdyttävät rakennusta kesällä siirtämällä lämpöä maaperään. Energiapaalujen taloudellisuus syntyy siitä, että ne pystyvät palvelemaan rakennusta kahdessa roolissa. Ne ovat osa rakennuksen energiajärjestelmää ja toimivat samalla myös kantavana rakenteena, joka siirtää rakennuksen kuormia perustuksilta maaperään. Lämpöpumppujärjestelmän kytkeminen paaluihin voi johtaa lämpötilan vaihteluun paaluissa sekä niitä ympäröivässä maaperässä, mikä puolestaan vaikuttaa paalujen ja maaperän lämpömekaanisiin, rakenteellisiin sekä geoteknisiin ominaisuuksiin. Vaikka energiapaaluja on asennettu jo paljon, ei paalujen lämpömekaanisesta käyttäytymisestä tai energiatehokkuudesta kylmien ilmastojen alueilla ole vielä paljoa tutkittua tietoa. Tässä väitöstutkimuksessa selvitettiin numeerisesti energiapaalujen rakennuspaikan pohjaolosuhteista riippuvaa tuottopotentiaalia Skandinaavisissa olosuhteissa ja ilmastossa. Tarkastelut kohdistuivat erityisesti pohjavesivirtauksen sekä vuodenaikojen ja ilman lämpötilan vaihtelun vaikutuksiin. Tutkimuksessa arvioitiin myös paalujen lämpötilan vaihtelujen vaikutuksia paalujen geoteknisiin ja rakenteellisiin ominaisuuksia sekä kestävyyteen. Numeeristen simulaatiotulosten perusteella betonipaaluun asennetun U-putkirakenteen avulla saavutetaan paras tuottopotentiaali. Tulokset osoittivat, että kohtalainen pohjaveden virtaus parantaa systeemin tuottoa noin 20 % verrattuna tilanteeseen, jossa vedellä kyllästetyssä maassa ei tapahdu pohjaveden virtausta. Analyysitulokset osoittavat myös, että paalujen lämpötilavaihteluista aiheutuvat lisäjännitykset vähentävät paalujen kantokykyä, mikä tulee ottaa huomioon paalujen mitoituksessa
Kuriger, Rex J. "Kinematics, statics, and dexterity of planar active scaffolding structures". Ohio : Ohio University, 1997. http://www.ohiolink.edu/etd/view.cgi?ohiou1177095329.
Semeraro, Onofrio. "Active Control and Modal Structures in Transitional Shear Flows". Doctoral thesis, KTH, Stabilitet, Transition, Kontroll, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117916.
QC 20130207
Wang, Qishan. "Active vibration and buckling control of piezoelectric smart structures". Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114328.
L'objectif de cette thése est le contrôle de la vibration et de flambage à l'aide de l'analyse par éléments finis et LQR/LQG technologies de contrôle de rétroaction pour les structures composites stratifiées piézo-électriques qui sont liés ou incorporés de surface de capteurs et d'actionneurs piézoélectriques. Il ya principalement deux parties ciblées. La partie des éléments finis : Deux formulations éléments finis pour les poutres laminées piézo-basé sur le classique d'Euler-Bernoulli et la théorie des poutres de Timoshenko, respectivement, linéaires couplées piézoélectriques équations constitutives, et le principe de variation de Hamilton sont développés. Un C0 continue, cisaillement flexible, à huit nuds élément de coque à double courbure sérendipité pour les plaques piézocomposites stratifiés et de coquillages est également dérivée basée sur la théorie de la couche-sage déformation de cisaillement, linéaires piézo-électriques couplés relations constitutives mécaniques, et le principe de variation de Hamilton. Toute la poutre, plaque, et des éléments de coque développés ont considéré la rigidité, de masse et les effets de couplage électromécanique du capteur piézo-électrique et les couches de l'actionneur. Les éléments de structure développéssont capables de traiter les effets non linéaires de déformation en cisaillementtransversal et la non-linéarité des matériaux composites, piézoélectrique-mécanique d'accouplement, et peut prévoir plus précisément les modes supérieurs de vibration, et peut être appliquée à partir de minces d'épaisseur moyenne structures composites multicouches. Ils sont évalués à la fois les vibrations et analyse de flambage de la poutre, plaque, et structures en coque. La partie de commande actif : La vibration de supprimer d'un porte à faux piézo-collé poutre, les deux premiers modes de flambement contrôle d'un appui simple piézo-collé poutre, et la vibration et le flambage contrôle de la charge d'un cantilever piézoélectrique stratifié plaque composite sont étudiés. Les résultats de l'analyse par éléments finis sont utilisés pour concevoir un régulateur linéaire quadratique (LQR) contrôleur et un linéaire quadratique gaussienne (LQG) compensateur avec un observateur d'état dynamique pour atteindre toutes les commandes. Les conceptions de commandes commencent par une méthode modale modle pour déterminer un modle modal réduit approximative qui peut représenter la dynamique du systme avec les modes les moins systme inclus. Un modle modal espace d'état de la structure intelligente qui a intégré la structure d'accueil d'colléscapteurs et d'actionneurs piézoélectriques, est ensuite utilisé pour concevoir le systme de contrôle. Les contrôles visant commentaires LQR/LQG sont avérés succs dans la suppression de la vibration et de stabiliser les modes de flambement des structures. Tant l'analyse par éléments finis et les résultats de simulation de contrôle actives sont compatibles avec les résultats existants d'analyse théoriques et les données expérimentales de la littérature. Quelques conclusions importantes et des observations intéressantes sont obtenues.
Md, Salleh Salihatun. "Active intelligent control of vibration of flexible plate structures". Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538085.
Potter, Jack. "Passive and semi-active damping of base-excited structures". Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618724.
Marseglia, Luca. "Nano-structures coupled to optically active defects in diamond". Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573911.
Karpenko, Daria. "Self-assembly of Self-similar Structures by Active Tiles". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4095.
Darus, Intan Zaurah Mat. "Soft computing adaptive active vibration control of flexible structures". Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408305.
Lee, Young-Sup. "Active control of smart structures using distributed piezoelectric transducers". Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324821.
El-Zanfaly, Dina Ezz ElDin. "Active shapes : introducing guidelines for designing kinetic architectural structures". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65545.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 69-73).
This thesis proposes guidelines for designing kinetic architectural structures, in which rules based on shape grammars, are used for motion capturing and design. There is an increasing demand for adaptive architecture that reconfigures itself physically to meet functional or climatic changes. These guidelines provide a way for the architect to describe and design novel kinetic structures based on s/he already has to meet required physical reconfigurations in these structures. Based on Shape Grammars, the rule A -> t(A) is introduced as a design guideline for designing kinetic architectural structures. (A) means here an Active Shape, that is a physical shape with motion observed or created by the designer. The Active Shape (A) could be composed from one physical component or several physical components together. t(A) means a new Active Shape produced by applying one or more transformations t on the original Active Shape to produce a novel motion. These transformations could be (1) a transformation of the arrangement of the components of the Active Shape, (2) a transformation of the motion control means between the components of the Active Shape, such as actuators, hinges and linkages, (3) a transformation of the geometry of the components of the Active Shape and any other applicable transformations such as a transformation in the materiality of the components of Active Shape (A). In order to test the abovementioned guidelines; two design experiments were set up, (1) a workshop with a group of students and (2) a self-study. The workshop consisted of four stages: two design stages and two reporting stages after each design stage. The participants were provided with samples of Active Shapes (A), and they were asked n the first stage to choose one active shape with two arrangements of its components, and design with this active shape a kinetic structure. After reporting what he designed, each participant was then asked to take a kinetic structure from the other participants and apply a transformation on the active shape of this structure, and then report what s/he has done. The self-study consisted of 2 projects designed by the author.
by Dina E. El-Zanfaly.
S.M.
Al-Hammadi, Mohammed Ridha Sadeq Abed. "Scour and scour protection around dynamically active marine structures". Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10053143/.
Nerves, Allan C. "Regenerative electric actuators for active control of civil structures". Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-10052007-143247/.
Davis, Denny E. "Optimization of transducers for active structural acoustic control of complex structures using numerical techniques". Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/40657.
Dai, Yang. "Feedback Control of Multi-Story Structures under Seismic Excitations". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26742.
Ph. D.