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Master's Projects

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Validation of APAS Aerodynamic Predictions with a Navier-Stokes CFD Analysis of a Hankey-Wedge Forebody

1999-12-09 , Sorensen, Kirk

While in the conceptual design phase of launch vehicles, aerodynamic data is often obtained through the use of a simple analytic program called APAS (Aerodynamic Preliminary Analysis System). While suffering from an archaic and temperamental interface, APAS yields results swiftly for simple geometries at a variety of angles of attack and Mach numbers. The results from APAS are compared to those obtained through the analysis of the same vehicle shape using a sophisticated CFD program called GASP (General Aerodynamic Simulation Program). The comparison is made on the forebody for the Stargazer Bantam launch vehicle, which is based on a Hankey-wedge design. Significant differences are noted and techniques to improve the accuracy of APAS output data are suggested

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Resource-Efficient Home Building: The Public Policy Implications for Georgia

1998-12 , Herd, Dorita Lynn

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Computational Frameworks for Collaborative, Multidisciplinary Design

1998-04-06 , Acton, David E.

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Community Brownfield Guidebook: Assessing and Resolving Environmental Barriers to Redevelopment

1997-05 , Hise, Rhonda

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The Bimese Concept: A Study of Mission and Economic Options

1999-08-01 , Tooley, Jeffrey

The ideal NASA space transportation system of the future consists of a fleet of low cost vehicles that can provide a wide variety of payload options while leveraging future commercial launch markets. The Bimese concept, a NASA Langley design for a reusable Earth-to-orbit space transportation system, tries to fill this future by attempting to, "provide the broadest range of payload and mission capabilities with the minimum number of architectural developments (Talay)." Creating a vehicle that meets this requirement can minimize development costs because the same vehicle design (and hence the same development cost) can be used to support various missions. Such a transportation system can also result in a more efficient operational and manufacturing scenario by creating a learning curve effect on these processes. A vehicle that can perform various missions also has the advantage of early initial operating capability because it can be phased in over time with early missions consisting of the simplest configurations. These characteristics of the Bimese space transportation system make it a candidate for a future NASA supported launch vehicle. The intent of this paper is to analyze the performance and economics of the Bimese space transportation system in terms of trying to fulfill NASA’s ideal future

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Transforming Aerodynamic Datasets into Parametric Equations for use in Multidisciplinary Design Optimization

1998-10-01 , Scott, Jeffrey

This paper presents a method of transforming aerodynamic datasets generated in Aerodynamic Preliminary Analysis System (APAS) into parametric equations which may subsequently be used in a multidisciplinary design optimization (MDO) environment for analyzing aerospace vehicles. APAS is an analysis code which allows the user to create a simple geometric model of a vehicle and then calculate the aerodynamic force coefficients of lift, drag, and pitching moment over a wide range of flight conditions. As such, APAS is a very useful tool for conceptual vehicle designs since it allows the force coefficients for a given design to be calculated relatively quickly and easily. However, APAS suffers from an outdated user interface and, because it is tedious to generate a new dataset during each design iteration, it is quite difficult to integrate into an MDO framework. Hence the desire for a method of transforming the APAS output into a more usable form. The approach taken and described in this paper involves the use of regression analysis techniques to accomplish the data transformation with three goals in mind. The first goal was to develop a parametric model for calculating the aerodynamic coefficients for a single unique geometry. The second goal was to extend this model to capture the effects of changes in vehicle geometry. The third goal was to write a Fortran program that would be capable of automatically carry out the regression analysis on a given APAS data set and produce the desired parametric equations. This paper presents the results and gives the model developed for analyzing a sample vehicle with a fixed geometry as well as the results of a sample vehicle with a variable geometry. The Fortran computer code is also given.

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Unit Based Pricing: Charging for Garbage Collection in the Future

1997-06 , Goswami, Alex

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An Analysis on the Development of Recreational Impact Fees for the City of Acworth, Georgia

1999-03 , Rose, Paul

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Self-Help Housing in Developing Countries

1998-05 , Meskinyar, Hawa

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Vocational Education in Georgia: An Economic Development Role

1997-06 , Cranford, Andrea

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