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Dissertations / Theses on the topic 'Inflatables'

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Published: 4 June 2021
Last updated: 7 February 2022

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1

Bond, Justin Matthew. "Status Monitoring Of Inflatables By Accurate Shape Sensing." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/677.

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The use of inflatable structures in aerospace applications is becoming increasingly widespread. In order to monitor the inflation status and overall health of these inflatables, an accurate means of shape sensing is required. To this end, we investigated two existing methods for measuring simple curvature, or curvature in one-dimension. The first method utilizes a pair of strain sensing Fiber Bragg Gratings (FBGs) separated by a known distance; dividing the difference in strain by the separation distance yields an experimental value for the one-dimensional curvature at a point. The second meth
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2

Tagwi, Dayton. "Inflatable weir hydraulics." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96686.

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Thesis (MEng)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: General objective of the study This thesis aims to evaluate the hydraulics of an inflatable weir in its fully inflated position to the almost fully deflated position using different diameter circular weirs with varying discharges, by considering the change in the weir radius and the dynamic pressures on the weir. In the evaluation, three cylindrical weirs were installed in a 2m wide flume and tested over various discharges. Methodology The three weirs, one with a 300mm diameter, another with a 250mm diameter, and the last on
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3

Pat, Terrance, and Terrance Pat. "Electronically Steerable Inflatable Antennas." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/626342.

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In today’s technologically driven world, antennas play an essential role in enabling wireless communications over long distances and allow communities to interact on a global scale. Typically, this is done using large networks of antenna systems on the ground and in space to ensure signals reliably arrive at their destinations, which can be very expensive in terms of replacement cost and maintenance as the number of nodes increase. We shall be discussing a new method for deploying space-borne antennas via CubeSats that will enable high speed communications with the ground and other satellites
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4

Scherrer, Isaac John. "GEOMETRIC CONTROL OF INFLATABLE SURFACES." UKnowledge, 2012. http://uknowledge.uky.edu/me_etds/11.

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High precision inflatable surfaces were introduced when NASA created the ECHO 1 Balloon in 1960. The experiment proved that inflatable structures were a feasible alternative to their rigid counterparts for high precision applications. Today inflatable structures are being used in aviation and aerospace applications and the benefits of using such structures are being recognized. Inflatable structures used in high precision structures require the inflatable surfaces to have controllable and predictable geometries. Many applications such as solar sails and radar reflectors require the surface of
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Carrasquillo, Omar (Omar Y. Carrasquillo De Armas). "Design of inflatable solar concentrator." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84399.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 115-116).<br>Solar concentrators improve the performance of solar collection systems by increasing the amount of usable energy available for a given collector size. Unfortunately, they are not known for their light weight and portability, which is ideal for basic applications like solar cooking. The goal of the project was to a design a light-weight and portable solar concentrator with minimal tracking requirements.
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6

Hsieh, Jen-Chi. "Free vibrations of inflatable dams." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53533.

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This work deals with the linear two-dimensional free vibrations of an inflated cylindrical membrane. An air-inflated membrane is considered first. Vibration frequencies and modes are determined for various cases. The lowest mode shape is anti-symmetric. In the rest of the work, the membrane is inflated with water. In some cases there is a reservoir of water on one side of the membrane. The membrane equation of motion is solved using a finite difference method, and the hydrodynamic pressures on the membrane, caused by the motion of the internal and external water domains, are treated by the bou
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7

Leeuwrik, Maarten James. "Nonlinear vibration analysis of inflatable dams." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45786.

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<p>In recent years the use of inflatable dams has become more widespread throughout the world. Various people have done studies on the shape and membrane tension of these structures; however, only a few authors have considered dynamic behavior. Due to the nature of the applications and the material composition of these structures, a study considering the dynamic response of an inflatable dam is warranted.</p> <p>In this study, the equation of motion for an air-inflated dam is derived, then solved using the Galerkin approximation method. The solution is performed for a one-term approximat
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8

Apedo, Komla Lolonyo. "Numerical modelling of inflatable structures made of orthotropic technical textiles : application to the frames of inflatable tents." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10145.

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L'objectif principal visé par cette thèse est de modéliser les poutres gonflables en textiles techniques orthotropes. Les approches statiques font l'objet de ce rapport. Avant d'aborder ce problème, nous avons été amenés à identifier tous les paramètres qui ont un effet direct sur les propriétés mécaniques effectives de ces composites. Ainsi, nous avons développé un modèle micro mécanique de prédiction de ces propriétés mécaniques. Le modèle proposé est basé sur l’analyse d'un volume élémentaire représentatif (VER) prenant en compte non seulement les propriétés mécaniques et la. fraction de vo
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9

Mathers, Naomi, and naomi mathers@vssec vic edu au. "Inflatable antennas for portable direct satellite communication." RMIT University. Electrical and Computer Engineering, 2010. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20100218.143609.

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Satellite-based communication system can provide access to voice, data, video and internet transmission that is independent of terrestrial infrastructure. This is particularly important in disaster response situations and military maneuvers where mobile personnel need to maintain direct contact with each other and the central control. One of the factors that currently limits the effectiveness and practicality of these systems is portability. These systems require lightweight equipment that can be quickly and easily deployed and operated in a variety of environments. Parabolic dish antennas ar
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10

Turner, Adam William. "Experimental Test Methods for Inflatable Fabric Beams." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/TurnerAW2006.pdf.

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11

Molina, Pombo Juan Cruz. "Mechanical characterization of fabrics for inflatable structures." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5844.

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Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains x, 107, 15 p. : ill. Includes abstract. Includes bibliographical references (p. 106-107).
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12

Rowe, Johnathan. "FINITE ELEMENT MODELING OF AN INFLATABLE WING." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/475.

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Inflatable wings provide an innovative solution to unmanned aerial vehicles requiring small packed volumes, such as those used for military reconnaissance or extra-planetary exploration. There is desire to implement warping actuation forces to change the shape of the wing during flight to allow for greater control of the aircraft. In order to quickly and effectively analyze the effects of wing warping strategies on an inflatable wing, a finite element model is desired. Development of a finite element model which includes woven fabric material properties, internal pressure loading, and external
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13

Puri, Manpreet Singh. "Design and analysis of inflatable space structures." Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28497.

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This thesis gives the conceptualization of inflation of inflatable membrane space structures. Although there has been little study using software simulation and the majority of documented research is based on theoretical numerical calculations. This research advanced the prior understanding of wrinkling within inflated membranes by using complex structures subjected to deformation loads. Within this thesis, a computational framework for the numerical analysis of the interaction between acting forces on the membrane and the membrane structure dynamics is presented. Moreover, in the case with th
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14

Lennon, Bernard Andrew. "Equilibrium and stability of inflatable membrane structures." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620672.

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15

Mysore, Guruprasad Jr. "Vibration Analysis of Single - Anchor Inflatable Dams." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36846.

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<p> Inflatable dams are flexible, cylindrical structures anchored to a foundation. They are used for a variety of purposes, e.g. diverting water for irrigation or groundwater recharging, impounding water for recreational purposes, and raising the height of existing dams or spillways. <p> The vibration behavior of such dams is analyzed. Single-anchor inflatable dams with fins are considered. First, a static analysis is performed which yields the equilibrium shapes of the dam, both in the presence and absence of water. Then, a dynamic analysis is undertaken which analyzes the small vibrations
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16

Brown, Ainsmar Xavier. "Inflatable wing UAV experimental and analytical flight mechanics." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39492.

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The field of man portable UASs (Unmanned Aerial Systems) is currently a key area in improving the fielded warrior's capabilities. Pressurized aerostructures that can perform with similar results of solid structures can potentially change how this objective may be accomplished now and in the future. Construction with high density polymers and other composites is currently part of active inflatable vehicle research. Many shape forming techniques have also been adapted from the airship and balloon manufacturing industry. Additional research includes modeling techniques so that these vehicles may
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17

Simpson, Andrew D. "DESIGN AND EVALUATION OF INFLATABLE WINGS FOR UAVs." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/589.

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Performance of inflatable wings was investigated through laboratory, wind tunnel and flight-testing. Three airfoils were investigated, an inflatable-rigidazable wing, an inflatable polyurethane wing and a fabric wing restraint with a polyurethane bladder. The inflatable wings developed and used within this research had a unique outer airfoil profile. The airfoil surface consisted of a series of chord-wise \bumps.andamp;quot; The effect of the bumps or \surface perturbationsandamp;quot; on the performance of the wings was of concern and was investigated through smoke-wire flow visualization. Ae
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18

Usui, Michiko. "AEROMECHANICS OF LOW REYNOLDS NUMBER INFLATABLE/RIGIDIZABLE WINGS." UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/321.

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Use of an inflatable/rigidizable wing is explored for Mars airplane designs. The BIG BLUE (Baseline Inflatable-wing Glider Balloon Launched Unmanned airplane Experiment) project was developed at the University of Kentucky, with an objective to demonstrate feasibility of this technology with a flight-test of an high-altitude glider with inflatable/rigidizable wings. The focus of this thesis research was to design and analyze the wing for this project. The wings are stowed in the fuselage, inflate during ascent, and rigidize with exposure to UV light. The design of wings was evaluated by using a
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19

Sanan, Siddharth. "Soft Inflatable Robots for Safe Physical Human Interaction." Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/303.

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Robots that can operate in human environments in a safe and robust manner would be of great benefit to society, due to their immense potential for providing assistance to humans. However, robots have seen limited application outside of the industrial setting in environments such as homes and hospitals. We believe a very important factor preventing the cross over of robotic technology from the factory to the house is the issue of safety. The safety issue is usually bypassed in the industrial setting by separation of human and robot workspaces. Such a solution is clearly infeasible for robots th
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20

Economides, Thoukidides A. "Experimental investigation on the dynamics of inflatable dams." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-172109/.

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21

Welch, Bryan William. "Shape Validation and RF Performance of Inflatable Antennas." Cleveland State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=csu1581609778706776.

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22

Nguyen, Thanh Truong. "Numerical modeling and buckling analysis of inflatable structures." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10123.

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L’objectif principal de cette thèse est de modéliser en flambement des poutres pressurisées en tissu souple homogène orthotrope (THO) composite. La première partie détaille les études expérimentales qui ont été menées sur des poutres gonflables à certain niveaux de pression afin de caractériser les propriétés mécaniques du matériau et le comportement en flambement de la structure. Dans une deuxième partie, une approche analytique a été envisagée afin d’étudier le flambement ainsi que le comportement d’une poutre gonflable orthotrope. Un modèle 3D gonflables poutre orthotrope basé sur la cinéma
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23

Tanner, Christopher Lee. "Aeroelastic analysis and testing of supersonic inflatable aerodynamic decelerators." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47534.

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The current limits of supersonic parachute technology may constrain the ability to safely land future robotic assets on the surface of Mars. This constraint has led to a renewed interest in supersonic inflatable aerodynamic decelerator (IAD) technology, which offers performance advantages over the DGB parachute. Two supersonic IAD designs of interest include the isotensoid and tension cone, named for their respective formative structural theories. Although these concepts have been the subject of various tests and analyses in the 1960s, 1970s, and 2000s, significant work remains to advance supe
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24

Gillette, Sean. "The Effects of Seductive Details in an Inflatable Planetarium." Thesis, Walden University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3595482.

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<p> Astronomy is becoming a forgotten science, which is evident by its relatively low enrollment figures compared to biology, chemistry, and physics. A portable inflatable planetarium brings relevance back to astronomy and offers support to students and educators by simulating realistic astronomical environments. This study sought to determine if learning is improved in an inflatable planetarium by adhering to the design principles of the cognitive theory of multimedia learning (CTML), specifically the coherence principle, in an authentic classroom. Two groups of 5<sup>th</sup> grade student
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25

Chavez, Erin Marie, Kate Allen, Scott Angus, and Tarrah Folley. "Portable, Inflatable Plug for a Gated-Irrigation Pipe System." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/144255.

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26

Venter, Martin Philip. "A methodology for numerical prototyping of inflatable dunnage bags." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97124.

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Thesis (PhD)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Dunnage bags are an inflatable dunnage variant, positioned and inflated between goods in multi-modal containers to restrain and protect the goods while in transit. This project endeavours to develop a simple method of generating new numerical prototypes for dunnage bags suitable for simulating operational loading of the bags. Previous research has produced a model that simulates the inflation of a paper dunnage bag using a simple pressure load. A dunnage bag reinforced with plain-woven polypropylene was chosen as the test
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27

DiGiovanna, Lia (Lia Rose). "Characterizing the mechanical properties of drop stitch inflatable structures." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83708.

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Thesis (S.B.)--Massachusetts Institute of Technology, Department of Mechanical Engineering, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 32).<br>This study investigates the mechanical properties of drop stitch inflatable structures with specific reference to inflatable stand up paddleboards. A sample of drop stitch material was fabricated and simple beam bending tests were performed at different pressures. This data was then used to invalidate a developed model for the deflection of the sample. High standard deviations indicate that the pressure i
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28

Gillette, Sean. "The Effects of Seductive Details in an Inflatable Planetarium." ScholarWorks, 2011. https://scholarworks.waldenu.edu/dissertations/1078.

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Astronomy is becoming a forgotten science, which is evident by its relatively low enrollment figures compared to biology, chemistry, and physics. A portable inflatable planetarium brings relevance back to astronomy and offers support to students and educators by simulating realistic astronomical environments. This study sought to determine if learning is improved in an inflatable planetarium by adhering to the design principles of the cognitive theory of multimedia learning (CTML), specifically the coherence principle, in an authentic classroom. Two groups of 5th grade students of similar abi
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29

Slagle, Adam Christopher. "Morphing Hypersonic Inflatable Aerodynamic Decelerator (HIAD) Mechanisms and Controls." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/96194.

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To enable a crewed mission to Mars, precision landing capabilities of Entry, Descent, and Landing (EDL) systems must be improved. The need for larger payloads, higher landing sites, and controllability has motivated the National Aeronautics and Space Administration (NASA) to invest in new technologies to replace traditional rigid aeroshell systems, which are limited in size by the payload envelope of existing launch vehicles. A Hypersonic Inflatable Aerodynamic Decelerator (HIAD) is an emerging technology that provides an increased drag area by inflating the aeroshell to diameters not possible
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30

Dewi, Fata Dwi Endyana Jr. "Three-Dimensional Analysis of Wave Attenuation by Anchored Hemicylindrical Shell." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35761.

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The performance of a flexible structure as a breakwater is investigated numerically. The structure is a hemicylinder and is filled with water of uniform pressure. It is anchored along the sides. Only flexural modes are present. The structure is modeled as an elastic shell using the finite element program ABAQUS. The fluid is assumed to be inviscid and incompressible. The fluid flow is analyzed using a boundary integral method and the integral equation is solved numerically by a panel method. The vibration characteristics of the structure are analyzed both in the absence and presence of w
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31

Schrader, Kale W. "Accelerometer Based Impact Localization and Scaling for Inflatable Space Structures." Fogler Library, University of Maine, 2010. http://www.library.umaine.edu/theses/pdf/SchraderKW2010.pdf.

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32

Clark, Ian Gauld. "Aerodynamic design, analysis, and validation of a supersonic inflatable decelerator." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/34708.

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Since the 1970's, NASA has relied on the use of rigid aeroshells and supersonic parachutes to enable robotic mission to Mars. These technologies are constrained by size and deployment condition limitations that limit the payload they can deliver to the surface of Mars. One candidate technology envisioned to replace the supersonic parachute is the supersonic inflatable aerodynamic decelerator (IAD). This dissertation presents an overview of work performed in maturing a particular type of IAD, the tension cone. The tension cone concept consists of a flexible shell of revolution that is shaped
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33

Fulcher, Jared T. "A DESIGN PATHFINDER WITH MATERIAL CORRELATION POINTS FOR INFLATABLE SYSTEMS." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/39.

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The incorporation of inflatable structures into aerospace systems can produce significant advantages in stowed volume to mechanical effectiveness and overall weight. Many applications of these ultra-lightweight systems are designed to precisely control internal or external surfaces, or both, to achieve desired performance. The modeling of these structures becomes complex due to the material nonlinearities inherent to the majority of construction materials used in inflatable structures. Furthermore, accurately modeling the response and behavior of the interfacing boundaries that are common to m
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34

Wu, Pai-Hung. "Analysis of the vibrations of inflatable dams under overflow conditions." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-10022008-063021/.

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35

Terry, Jonathan Spencer. "Adaptive Control for Inflatable Soft Robotic Manipulators with Unknown Payloads." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/6769.

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Soft robotic platforms are becoming increasingly popular as they are generally safer, lighter, and easier to manufacture than their more rigid, heavy, traditional counterparts. These soft platforms, while inherently safer, come with significant drawbacks. Their compliant components are more difficult to model, and their underdamped nature makes them difficult to control. Additionally, they are so lightweight that a payload of just a few pounds has a significant impact on the manipulator dynamics. This thesis presents novel methods for addressing these issues. In previous research, Model Predic
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36

Butt, Lauren Marie. "Design Optimization of a High Aspect Ratio Rigid/Inflatable Wing." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/42641.

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High aspect-ratio, long-endurance aircraft require different design modeling from those with traditional moderate aspect ratios. High aspect-ratio, long endurance aircraft are generally more flexible structures than the traditional wing; therefore, they require modeling methods capable of handling a flexible structure even at the preliminary design stage. This work describes a design optimization method for combining rigid and inflatable wing design. The design will take advantage of the benefits of inflatable wing configurations for minimizing weight, while saving on design pressure requir
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37

Lowery, Kristen Mary. "Dynamic Analysis of an Inflatable Dam Subjected to a Flood." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35802.

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A dynamic simulation of the response of an inflatable dam subjected to a flood was carried out to determine the survivability envelope of the dam where it can operate without rupture, or overflow. A fully nonlinear free-surface flow was applied in two dimensions using a mixed Eulerian-Lagrangian formulation. <p> An ABAQUS finite element model was used to determine the dynamic structural response of the dam. The problem was solved in the time domain which allows the prediction of a number of transient phenomena such as the generation of upstream advancing waves, and dynamic structural collap
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38

Cook, Andy. "A study of hybrid inflatable space booms for small satellite applications." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/393986/.

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Inflatables have considerable packing efficiencies and allow simple deployment. This is due to their lack of stiffness when deflated, offering low cost solutions for space applications. After inflation, these typically soft systems could be improved using tape springs as structural stiffeners along the length of the boom, creating hybrid structures. These simple low cost single element components are easily stowed gaining strain energy in their collapsed state without permanent deformation providing additional potential to drive boom deployment. Combining both inflatable and tape spring compon
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39

Johansen, Todd A. "Optimization of a Low Reynolds Number 2-D Inflatable Airfoil Section." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/864.

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A stand-alone genetic algorithm (GA) and an surrogate-based optimization (SBO) combined with a GA were compared for accuracy and performance. Comparisons took place using the Ackley Function and Rastrigin's Function, two functions with multiple local maxima and minima that could cause problems for more traditional optimization methods, such as a gradient-based method. The GA and SBO with GA were applied to the functions through a fortran interface and it was found that the SBO could use the same number of function evaluations as the GA and achieve at least 5 orders of magnitude greater accurac
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40

Hawkins, Robert A. Jr. "Analysis of an Inflatable Gossamer Device to Efficiently De-Orbit CubeSats." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1139.

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There is an increased need for spacecraft to quickly and efficiently de-orbit themselves as the amount of debris in orbit around Earth grows. Defunct spacecraft pose a significant threat to the LEO environment due to their risk of fragmentation. If these spacecraft are de-orbited at the end of their useful life their risk to future spacecraft is greatly lessened. A proposed method of efficiently de-orbiting spacecraft is to use an inflatable thin-film envelope to increase the body's area to mass ratio and thusly shortening its orbital lifetime. The system and analysis presented in this project
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41

Candemir, Kadri Uygar Çıkış Şeniz. "Inflatable pillow system as a glass substitute in terms of building envelope/." [s.l.]: [s.n.], 2003. http://library.iyte.edu.tr/tezler/master/mimarlik/T000290.rar.

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42

Best, Charles Mansel. "Position and Stiffness Control of Inflatable Robotic Links Using Rotary Pneumatic Actuation." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5971.

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Inflatable robots with pneumatic actuation are naturally lightweight and compliant. Both of these characteristics make a robot of this type better suited for human environments where unintentional impacts will occur. The dynamics of an inflatable robot are complex and dynamic models that explicitly allow variable stiffness control have not been well developed. In this thesis, a dynamic model was developed for an antagonistic, pneumatically actuated joint with inflatable links.The antagonistic nature of the joint allows for the control of two states, primarily joint position and stiffness. Firs
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43

Wilson, Joshua Parker. "Extending Time Until Failure During Leaking in Inflatable, Pneumatically Actuated Soft Robots." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6264.

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Soft robots and particularly inflatable robots are of interest because they are lightweight, compact, robust to impact, and can interact with humans and their environment relatively safely compared to rigid and heavy traditional robots. Improved safety is due to their low mass that results in low-energy collisions and their compliant, soft construction. Inflatable robots (which are a type of soft robot) are also robust to impact and have a high torque to weight ratio. As a result inflatable robots may be used for many applications such as space exploration, search and rescue, and human-robot i
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McCoy, Shannon E. K. "The design and performance of a low-cost inflatable wheelchair seat cushion." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123281.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 55-57).<br>For wheelchair users, the use of wheelchair seat cushions is vital to preventing life-threatening pressure sores, but high quality air cushions are often too expensive and inaccessible for many people. Given the prevalence of pressure sores, there is a need for a more accessible alternative to expensive air cushions. The design of a low-cost inflatable wheelchair seat cushion made of bicycle inner tubes
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Williams, Robert Brett. "Localized Effects of Piezopolymer Devices on the Dynamics of Inflatable Space-Based Structures." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34542.

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Inflatable space-based devices have become popular over the past three decades, as they offer minimized launch-mass and launch-volume. Since some satellites have mirror sections over fifty feet in diameter and struts with lengths over ninety feet, inflation while in orbit has become a necessary procedure. Once inflated, these space structures are subject to two types of vibrations: those induced mechanically by guidance systems and space debris and those induced thermally from variable amounts of direct sunlight as they orbit about earth. Controlling vibrations of spaced-based structures i
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46

Suhey, Jeffrey. "Preliminary design and nonlinear numerical analysis of an inflatable open-ocean aquaculture cage." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0005442.

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Han, Chul Min. "Dual-band reflectarrays using microstrip ring elements and their applications with various feeding arrangements." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4416.

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In recent years there has been a growing demand for reduced mass, small launch volume, and, at the same time, high-gain large-aperture antenna systems in modern space-borne applications. This dissertation introduces new techniques for dual-band reflectarray antennas to meet these requirements. A series of developments is presented to show the dual-band capability of the reflectarray. A novel microstrip ring structure has been developed to achieve circular polarization (CP). A C/Ka dual-band front-fed reflectarray antenna has been designed to demonstrate the dual-band circular polarized operati
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Terjesen, Steven. "Navigation system design and state estimation for a small rigid hull inflatable boat (RHIB)." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/44016.

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Approved for public release; distribution is unlimited<br>Autonomous operation of a small rigid hull inflatable boat (RHIB) is a complex problem that requires a robust network of sensors, controllers, processors, and actuators. Furthermore, autonomous navigation requires accurate state estimation, fusing and filtering data from an array of sensors to give the best possible estimates of attitude, position, and velocity. This thesis will address the hardware modifications and navigation state estimators used to configure the SeaFox Mk II RHIB for future autonomous operations. The study began wit
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Rodriguez, Garcia Javier. "Numerical study of dynamic relaxation methods and contribution to the modelling of inflatable lifejackets." Lorient, 2011. http://www.theses.fr/2011LORIS247.

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Dynamic relaxation (DR) is a numerical method introduced in 1965 by A. S. Day in the book "The Engineer". From 1983, with the works presented by P. Underwood, it became more and more used. Since then, many applications were found, and several authors presented different improvements on the method in order to optimize the calculations. Nowadays, its use is widely spread in fields as structural dynamics (particularly in form-finding), geomechanics or biomechanics. When using DR in numerical simulations, researchers followed two different paths in the choice of a damping strategy for the oscillat
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Dickerson, Catherine. "Salvaging meaning : exploring the language of inflatable kinetic sculptures and the materiality of plastic." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/10408.

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Includes bibliographical references.<br>Inflatable sculpture is often seen as absurd, comic or light-hearted, but it can also convey a darker, more serious tone. The inflatable sculptures created in part fulfillment for this degree explore refabrication through the use of discarded plastic. This body of work highlights the relationship between industrialisation, plastic goods and nature. The insubstantial, flimsy qualities of the inflatable are an extended metaphor for the fragility of ecologies and the impact of plastic pollution on the environment.
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