Series
Master's Projects

Permanent Link
https://hdl.handle.net/1853/71003
Series Type
Publication Series
Description
Associated Organization(s)
Associated Organization(s)

Filters

2000 - 2009 107
83 25
107
107
Reset filters

Settings
Start date: 2000 × End date: 2009 ×

Publication Search Results

Now showing 1 - 10 of 107
  • Thumbnail Image
    Item
    A Plan for Industrial Land and Sustainable Industry in the City of Atlanta
    (Georgia Institute of Technology, 2009-12-08) Driemeier, Kale ; Hoelzel, Nathanael ; Jain, Rahul ; Mansbach, Jodi ; Morrow, Edward ; Moseley, Charlie ; Stevens, Shelley ; Zayas, Ermis
    The Atlanta Development Authority commissioned this report from the School of City and Regional Planning at Georgia Tech to better understand the problems and solutions to its loss of industrial land. In this report, we present a plan for the protection of industrial land in the City of Atlanta and to further the goal of stimulating future growth in Atlanta's industrial sector, all with an eye toward sustainability.
  • Thumbnail Image
    Item
    Strategies for Neighborhood Recovery: High Point, Joyland and Chosewood Park, Atlanta
    (Georgia Institute of Technology, 2009-12) Lee, S. Won ; Brandon, Leonard J. ; Berry, Kirsten ; Mullins, Nicholas ; Sinclair, Alyssa ; Mager, Christine ; Brandon, Leonard J. ; Smith, Brooks ; Hawes, Mary Beth ; Adrian, Troels ; Lee, Yung San
  • Thumbnail Image
    Item
    Lujiazui:Pudong: Retrofits
    (Georgia Institute of Technology, 2009-12) Dagenhart, Richard ; Yang, Perry Pei-Ju ; Getty, Drew ; Thompson, Claire ; Williams, Galen ; Jones, Paul ; Murphy, Diana ; Tabor, Reginald ; Johnson, Louis ; Sanders, Julie ; Ghizoni, Renato ; Morrow, Edward ; Wallace, Ross
    A joint two-week workshop in Shanghai sponsored by the School of Architecture at Georgia Tech and the Department of Architecture at Tongji University. Projects were prepared in teams of Chinese and American students as retrofits to Lujiazui, the new financial “downtown” in Pudong, Shanghai.
  • Thumbnail Image
    Item
    Exploring the F6 Fractionated Spacecraft Trade Space with GT-FAST
    (Georgia Institute of Technology, 2009-11-12) Lafleur, Jarret M.
    Released in July 2007, the Broad Agency Announcement for DARPA’s System F6 outlined goals for flight demonstration of an architecture in which the functionality of a traditional monolithic satellite is fulfilled with a fractionated cluster of free-flying, wirelessly interconnected modules. Given the large number of possible architectural options, two challenges facing systems analysis of F6 are (1) the ability to enumerate the many potential candidate fractionated architectures and (2) the ability to analyze and quantify the cost and benefits of each architecture. This paper applies the recently developed Georgia Tech F6 Architecture Synthesis Tool (GT-FAST) to the exploration of the System F6 trade space. GT-FAST is described in detail, after which a combinatorial analysis of the architectural trade space is presented to provide a theoretical contribution applicable to future analyses clearly showing the explosion of the trade space as the number of fractionatable components increases. Several output metrics of interest are defined, and Pareto fronts are used to visualize the trade space. The first set of these Pareto fronts allows direct visualization of one output against another, and the second set presents cost plotted against a Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) score aggregating performance objectives. These techniques allow for the identification of a handful of Pareto-optimal designs from an original pool of over 3,000 potential designs. Conclusions are drawn on salient features of the resulting Pareto fronts, important competing objectives which have been captured, and the potential suitability of a particularly interesting design designated PF0248. A variety of potential avenues for future work are also identified.
  • Thumbnail Image
    Item
    Analysis of Human-System Interaction For Landing Point Redesignation
    (Georgia Institute of Technology, 2009-05-26) Chua, Zarrin K.
    Despite two decades of manned spaceflight development, the recent thrust for increased human exploration places significant demands on current technology. More information is needed in understanding how human control affects mission performance and most importantly, how to design support systems that aid in human-system collaboration. This information on the general human-system relationship is difficult to ascertain due to the limitations of human performance modeling and the breadth of human actions in a particular situation. However, cognitive performance can be modeled in limited, well-defined scenarios of human control and the resulting analysis on these models can provide preliminary information with regard to the human-system relationship. This investigation examines the critical case of lunar Landing Point Redesignation (LPR) as a case study to further knowledge of the human-system relationship and to improve the design of support systems to assist astronauts during this task. To achieve these objectives, both theoretical and experimental practices are used to develop a task execution time model and subsequently inform this model with observations of simulated astronaut behavior. The experimental results have established several major conclusions. First, the method of LPR task execution is not necessarily linear, with tasks performed in parallel or neglected entirely. Second, the time to complete the LPR task and the overall accuracy of the landing site is generally robust to environmental and scenario factors such as number of points of interest, number of identifiable terrain markers, and terrain expectancy. Lastly, the examination of the overall tradespace between the three main criteria of fuel consumption, proximity to points of interest, and safety when comparing human and analogous automated behavior illustrates that humans outperform automation in missions where safety and nearness to points of interest are the main objectives, but perform poorly when fuel is the most critical measure of performance. Improvements to the fidelity of the model can be made by transgressing from a deterministic to probablistic model and incorporating such a model into a six degree-of-freedom trajectory simulator. This paper briefly summarizes recent technological developments for manned spaceflight, reviews previous and current efforts in implementing LPR, examines the experimental setup necessary to test the LPR task modeling, discusses the significance of findings from the experiment, and also comments on the extensibility of the LPR task and experiment results to human Mars spaceflight.
  • Thumbnail Image
    Item
    Experimental Determination of Material Properties for Inflatable Aeroshell Structures
    (Georgia Institute of Technology, 2009-05-26) Hutchings, Allison L.
    As part of a deployable aeroshell development effort, system design, materials evaluation, and analysis methods are under investigation. One specific objective is to validate finite element analysis techniques used to predict the deformation and stress fields of aeroshell inflatable structures under aerodynamic loads. In this paper, we discuss the results of an experimental mechanics study conducted to ensure that the material inputs to the finite element models accurately predict the load elongation characteristics of the coated woven fabric materials used in deployable aeroshells. These coated woven fabrics exhibit some unique behaviors under load that make the establishment of a common set of test protocols difficult. The stiffness of a woven fabric material will be influenced by its biaxial load state. Uniaxial strip tensile testing although quick and informative may not accurately capture the needed structural model inputs. Woven fabrics, when loaded in the bias direction relative to the warp and fill axes, have a resultant stiffness that is quite low as compared with the warp and fill directional stiffness. We evaluate the experimental results from two load versus elongation test devices. Test method recommendations are made based on the relevance and accuracy of these devices. Experimental work is conducted on a sample set of materials, consisting of four fabrics of varying stiffness and strength. The building blocks of a mechanical property database for future aeroshell design efforts are constructed.
  • Thumbnail Image
    Item
    Computational Fluid Dynamics Validation of a Single, Central Nozzle Supersonic Retropropulsion Configuration
    (Georgia Institute of Technology, 2009-05) Cordell, Christopher E., Jr.
    Supersonic retropropulsion provides an option that can potentially enhance drag characteristics of high mass entry, descent, and landing systems. Preliminary flow field and vehicle aerodynamic characteristics have been found in wind tunnel experiments; however, these only cover specific vehicle configurations and freestream conditions. In order to generate useful aerodynamic data that can be used in a trajectory simulation, a quicker method of determining vehicle aerodynamics is required to model supersonic retropropulsion effects. Using computational fluid dynamics, flow solutions can be determined which yield the desired aerodynamic information. The flow field generated in a supersonic retropropulsion scenario is complex, which increases the difficulty of generating an accurate computational solution. By validating the computational solutions against available wind tunnel data, the confidence in accurately capturing the flow field is increased, and methods to reduce the time required to generate a solution can be determined. Fun3D, a computational fluid dynamics code developed at NASA Langley Research Center, is capable of modeling the flow field structure and vehicle aerodynamics seen in previous wind tunnel experiments. Axial locations of the jet terminal shock, stagnation point, and bow shock show the same trends which were found in the wind tunnel, and the surface pressure distribution and drag coefficient are also consistent with available data. The flow solution is dependent on the computational grid used, where a grid which is too coarse does not resolve all of the flow features correctly. Refining the grid will increase the fidelity of the solution; however, the calculations will take longer if there are more cells in the computational grid.
  • Thumbnail Image
    Item
    Fully-Propulsive Mars Atmospheric Transit Strategies for High-Mass Missions
    (Georgia Institute of Technology, 2009-04-29) Marsh, Christopher L.
    A systems analysis focused on the use of propulsion during the EDL sequence at Mars for high-payload missions is presented. Trajectory simulation and mass sizing are performed to analyze the feasibility of a fully-propulsive descent. A heat rate boundary and associated control law are developed in an effort to limit the heating loads placed on the vehicle. Analysis is performed to explore the full-propulsive EDL strategy’s sensitivity to the vehicle’s propulsive capabilities and aero-propulsive and vehicle models. The EDL strategy is examined for ranges of initial masses and heat rate constraints, outlining an envelope of feasibility. The proposed architecture is compared against EDL systems in which significant aeroassist technology is employed. With this information, an overview of the impact of a fully-propulsive EDL system on spacecraft design and functionality is offered
  • No Thumbnail Available
    Item
    A Static Evaluation of Transtibial Prosthesis Suspension
    (Georgia Institute of Technology, 2009-04-22) Brooks, Dustin
    Previously, there have been a number of studies comparing different transtibial suspension methods; however, studies using elevated negative pressure (vacuum) as a suspension method are limited. The purpose of this study is to compare three methods of transtibial suspension (vacuum, suction, and knee sleeve) with respect to pistoning. Our hypotheses were: one that vacuum suspension will significantly reduce the amount of pistoning compared to knee sleeve and suction suspensions, and two that a greater magnitude of pistoning would be apparent in individuals with a higher percentage of redundant tissue. Seven subjects with unilateral transtibial amputations were included in this study. A custom made prosthesis was fabricated for each subject that allowed for easy conversion between suspension methods. For each suspension method, radiographic scans of the subject’s limb were produced inside the prosthetic socket using the dual energy X-ray absorptiometry (DEXA) scanner for three conditions. These conditions, designed to simulated dynamic gait, consited of an unweighted, loaded to half body weight, and a 44.5 N distraction. Using a multivariate repeated measures ANOVA along with a Bonferroni post-hoc analysis, statistical significance was shown between both knee sleeve and suction and between knee sleeve and vacuum suspensions with regard to pistoning. Although statistically insignificant, the p value (p=0.063) was very close to the alpha level for significance of 0.05 between suction and vacuum suspensions. In contrast to previous schools of thought this study has also shown that the amount of redundant tissue and pistoning are not strongly correlated.
  • No Thumbnail Available
    Item