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Dissertations / Theses on the topic 'Active structures'

Author: Grafiati

Published: 7 July 2024

Last updated: 19 July 2025

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1

Toews, von Riesen Eduard. "Active hyperhelical structures." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612458.

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2

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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3

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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4

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.

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The purpose of this thesis was to design controllers by using H1 and &sup1<br>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 &macr<br>n. They were aluminum passive structures with surface bonded PZT (Lead-Zirconate-Titanate) patches. The structures were considered in clamped-free con&macr<br>guration. The &macr<br>rst part of this study focused on the identi&macr<br>cation of nominal system models of the smart structures from the experimental data. For the experimentally i

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5

Chang, Min-Yung. "Active vibration control of composite structures." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-09162005-115021/.

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6

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.

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7

Maldonado-Mercado, Julio Cesar. "Passive and active control of structures." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36654.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1995.<br>Includes bibliographical references (leaves 94-98).<br>by Julio Cesar Maldonado-Mercado.<br>M.S.

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8

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.

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9

Scruggs, Jeffrey. "Active, Regenerative Control of Civil Structures." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/34332.

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An analysis is presented on the use of a proof-mass actuator as a regenerative force actuator for the mitigation of earthquake disturbances in civil structures. A proof-mass actuator is a machine which accelerates a mass along a linear path. Such actuators can facilitate two-way power flow. In regenerative force actuation, a bi- directional power-electronic drive is used to facilitate power flow both to and from the proof-mass actuator power supply. With proper control system design, this makes it possible to suppress a disturbance on a structure using mostly energy extracted from t

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10

Maillard, Julien. "Advanced Time Domain Sensing For Active Structural Acoustic Control." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30335.

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Active control of sound radiation from vibrating structures has been an area of much research in the past decade. In Active Structural Acoustic Control (ASAC), the minimization of sound radiation is achieved by modifying the response of the structure through structural inputs rather than by exciting the acoustic medium (Active Noise Control, ANC). The ASAC technique often produces global far-field sound attenuation with relatively few actuators as compared to ANC. The structural control inputs of ASAC systems are usually constructed adaptively in the time domain based on a number of error sign

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11

Ewing, Cameron. "Semi-active management of blast load structural response." Thesis, University of Canterbury. Mechanical Engineering, 2007. http://hdl.handle.net/10092/1225.

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This thesis investigates the possibility of controlling the response of a general multi-degree of freedom structure to a relatively distant blast load using passive and semi-active devices. A relatively distant blast is one that applies significant momentum to the structure, but does not destroy the face of the structure. Three multi-storey structures, and one single-storey structure, are modelled using non-linear finite elements with structural columns discretised into multiple elements to accurately capture the effects of higher order modes that are typically excited in such blast load respo

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12

Matheu, Enrique E. "Active and Semi-Active Control of Civil Structures under Seismic Excitation." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30310.

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The main focus of this study is on the active and semi-active control of civil engineering structures subjected to seismic excitations. Among different candidate control strategies, the sliding mode control approach emerges as a convenient alternative, because of its superb robustness under parametric and input uncertainties. The analytical developments and numerical results presented in this dissertation are directed to investigate the feasibility of application of the sliding mode control approach to civil structures. In the first part of this study, a unified treatment of active a

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13

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/.

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This thesis presents a new hybrid active and semi-active control method for vibration suppression in flexible structures. The method uses a combination of a semi-active device and an active control actuator situated elsewhere in the structure to suppress vibrations. The key novelty is to use the hybrid controller to enable the semi-active device to achieve a performance as close to a fully active device as possible. This is accomplished by ensuring that the active actuator can assist the semi-active device in the regions where energy is required. Also, the hybrid active and semi-active control

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14

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.

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15

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.

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16

Berlin, Andrew A. "Towards Intelligent Structures: Active Control of Buckling." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/6768.

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The buckling of compressively-loaded members is one of the most important factors limiting the overall strength and stability of a structure. I have developed novel techniques for using active control to wiggle a structural element in such a way that buckling is prevented. I present the results of analysis, simulation, and experimentation to show that buckling can be prevented through computer-controlled adjustment of dynamical behavior.sI have constructed a small-scale railroad-style truss bridge that contains compressive members that actively resist buckling through the use of pi

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17

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.

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18

Rentzos, Panagiotis. "Active vibration control of civil engineering structures." Thesis, City University London, 2007. http://openaccess.city.ac.uk/8571/.

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This thesis is in the area of active vibration control of Civil Engineering structures subject to earthquake loading. Existing structural control methods and technologies including passive, active, semi-active and hybrid control are first introduced. An extensive analysis of a frame-pendulum model is developed and analysed to investigate under what conditions effective energy dissipation is achieved in Tuned Mass Damper systems and the limitation of these devices under stiffness degradation when the structure enters the inelastic region. Linear Quadratic Gaussian and H-infinity active control

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19

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.

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20

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.

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21

Perry, David John. "Active CR filter structures using multiple feedback." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38135.

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22

Hyde, T. Tupper. "Active vibration isolation for precision space structures." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11189.

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23

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.

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24

Young, Andrew J. "Active control of vibration in stiffened structures." Title page, contents and abstract only, 1995. http://hdl.handle.net/2440/37722.

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Active control of vibration in structures has been investigated by an increasing number of researchers in recent years. There has been a great deal of theoretical work and some experiment examining the use of point forces for vibration control, and more recently, the use of thin piezoelectric crystals laminated to the surfaces of structures. However, control by point forces is impractical, requiring large reaction masses, and the forces generated by laminated piezoelectric crystals are not sufficient to control vibration in large and heavy structures. The control of flexural vibrations in sti

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25

Johnson, Martin Eric. "Active control of sound transmission." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243189.

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26

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.

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27

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.

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Thesis (Ph. D.)--University of Adelaide, Dept. of Mechanical Engineering, 1999?<br>Copy 2 does not have a CD-ROM. Includes bibliographical references (p. 317-330). Also available in an electronic version.

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28

Gummadi, Lakshmana Nagesh Babu. "Active control of delaminations in smart composite structures." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/13022.

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29

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.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>FUNDAÇÃO UNIVERSIDADE DO RIO GRANDE<br>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 aplicaç

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30

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.

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31

Gawith, Corin B. E. "Novel active waveguide devices in direct-bonded structures." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/15488/.

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This thesis describes a series of experimental studies on the use of direct bonding for optical waveguide fabrication. The direct bonding technique involves contacting two ultra-clean polished surfaces to form an adhesive-free vacuum-tight bond. Optical materials bonded in this way can be formed into waveguide devices, and this work extends direct bonding to include periodically poled materials and a new solid-state ion-exchange process. The first result of this work describes the fabrication of a 5.5-mm-long, 12-µm-thick periodically poled LiNbO3 planar waveguide buried in LiTaO3. Frequency d

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32

Paupitz, Goncalves Paulo José. "Dynamic analysis and active control of lattice structures." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/69737/.

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This thesis presents an investigation of the factors controlling the performance of two forms of active vibration control applied to lattice structures, such as those used for space applications. The structure considered is based on a lattice structure assembled by NASA in 1984. It consists of a satellite boom with 93 aluminium members connected rigidly through 33 spherical joints. The structure has two distinct forms of motion which are categorized in terms of short and long wavelength modes. The short wavelength modes occurs when the length of the individual members is a multiple of half wav

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33

Brennan, Michael John. "Active control of waves on one-dimensional structures." Thesis, University of Southampton, 1994. https://eprints.soton.ac.uk/69563/.

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34

Yousefi-Koma, Aghil Carleton University Dissertation Engineering Mechanical and Aerospace. "Active vibration control of smart structures using piezoelements." Ottawa, 1997.

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35

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/.

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36

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.

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Abstract High energy prices and new environmental policies have made geothermal energy increasingly popular. The EU, including Finland, aims to increase the use of renewable energy resources and reduce carbon emissions. Geothermal energy pile foundations, so-called energy piles, are considered a viable alternative technology for producing energy instead of traditional methods. Geothermal heat pump systems are economically efficient and renewable environmentally friendly energy production systems in which the ground acts as a heat source in winter and as a heat sink in summer. Energy piles are

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37

Kuriger, Rex J. "Kinematics, statics, and dexterity of planar active scaffolding structures." Ohio : Ohio University, 1997. http://www.ohiolink.edu/etd/view.cgi?ohiou1177095329.

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38

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.

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Flow control of transitional shear flows is investigated by means of numerical simulations. The attenuation of three-dimensional wavepackets of Tollmien-Schlichting (TS) and streaks in the boundary layer is obtained using active control in combination with localised sensors and actuators distributed near the rigid wall. Due to the dimensions of the discretized Navier-Stokes operator, reduced-order models are identified, preserving the dynamics between the inputs and the outputs of the system. Balanced realizations of the system are computed using balanced truncation and system identification.

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39

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.

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The objective of this dissertation is the vibration and buckling control of piezo-laminated composite structures with surface bonded or embedded piezoelectric sensors and actuators by using the finite element analysis and LQR/LQG feedback control techniques. The focus is mainly on two aspects: the finite element part and the active control part. (1) The finite element part:Two finite element formulations for the piezo-laminated beams based on the classical Bernoulli-Euler and the Timoshenko beam theories are developed using the coupled linear piezoelectric constitutive equations, and the Hamil

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40

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.

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41

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.

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It has become commonplace for discrete passive or active elements to be added to Structures to mitigate against vibration. More recently, semi-active damping has been a focus of research. Semi- active systems are attractive due to their performance, low cost, power consumption and control stability. In this thesis we consider how passive and semi-active damping systems may he designed to mitigate against. vibration in base-excited structures. initially we consider the base isolation of a single degree-of-freedom system. The optimality of the common sky-hook switching controller is assessed and

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42

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.

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43

Karpenko, Daria. "Self-assembly of Self-similar Structures by Active Tiles." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4095.

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The natural capacity of DNA for molecular self-assembly has already been exploited to create DNA based tiles which can self-assemble into nano-scale arrays and carry out nano-scale computation. Thus far, however, all such self-assembly has been passive, in the sense that the binding capacities of a tile are never altered throughout the assembly. The idea of active tiles, tiles that can send signals to each other and activate latent binding sites, has been proposed but never incorporated into a formal model. Here, I present an extension of the existent abstract tile assembly model by defining a

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44

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.

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45

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.

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46

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.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 69-73).<br>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 me

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47

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/.

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The fast growing and proven offshore wind energy industry provides the motivation for this study, in particular the prediction and control of scour around foundations. This thesis is concerned with the impact of the dynamic behaviour of marine structures (such as wind turbines) on scour and scour protection around foundations in non-cohesive and cohesive beds. Firstly, to investigate the potential of pile cyclic movement, a range of cases were tested in non-cohesive sediment. These concluded with a very long, multi stage test simulating the exposure of a monopile to a sequence of storm and cal

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48

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/.

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49

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.

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50

Dai, Yang. "Feedback Control of Multi-Story Structures under Seismic Excitations." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26742.

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This dissertation studies the feedback control of the dynamic response of multi-story structures to seismic excitations. The seismic excitations are represented by arbitrary unknown stochastic disturbances. The research consists of modeling of the structure with a control system and a control design in the state space. A combination of the extended Hamilton's principle and the Hierarchical Finite Element Method (HFEM) was used to derive the discrete differential equations of motion. This method exhibits superior accuracy with fewer degrees of freedom (DOF). The discrete equation were real

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