Series
Master's Projects

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

Filters

2004 19
19
19
19
Reset filters

Settings
Start date: 2004 × End date: 2004 ×

Publication Search Results

Now showing 1 - 10 of 19
  • Thumbnail Image
    Item
    Alkaline pulping : deadload reduction studies in chemical recovery system
    (Georgia Institute of Technology, 2004-12-02) Chandra, Yusup
    The kraft pulping process has been known for decades. The focus in kraft pulping has always been on better operation of the chemical recovery system. One of the targets is on deadload (sodium sulfate (Na2SO4) and sodium carbonate (Na2CO3)) reduction in white liquor. A model based on several literature references was developed to study the effect of deadload reduction. A base model was developed based on current mill operation. This base model was compared to the deadload reduction model. Overall improvement, such as operating cost saving and revenue generation was achieved from deadload reduction. Operating cost saving involves less deadload chemical in chemical recovery system, and less water that was associated with the deadload itself. Revenue generation involves generating more steam and heat from the recovery boiler that can be used for mill purposes or energy revenue. Two important variables to achieve deadload reduction are causticizing efficiency and reduction efficiency.
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Discrete Event Simulation of Reusable Launch Vehicle Ground Operations (RLVSim)
    (Georgia Institute of Technology, 2004-07-30) Reeves, John Daniel, Jr.
  • Thumbnail Image
    Item
    Development of An Online Database Tool for Quick Access to Mass Estimating Relationships
    (Georgia Institute of Technology, 2004-05-01) Pimentele, Janssen
    This document describes the methods and approach used in the development of an online database tool used for quick access to mass estimating relationships. The resulting tool is GOMER – Georgia Tech Online Mass Estimating Resource. This tool utilizes a typical three-tier database architecture employed by many web database applications. A unique relationship scheme was used to preserve the complex relationships found in the data sets. This scheme allows the user to search through the database using a variety of methods, while returning a list of results that can be examined in further detail. MySQL and PHP were used extensively throughout in the creation and implementation of the GOMER database.
  • Thumbnail Image
    Item
    Responsive Access Small Cargo Affordable Launch (RASCAL) Independent Performance Evaluation
    (Georgia Institute of Technology, 2004-05-01) Young, David
    RASCAL is a Defense Department initiative that stands for Responsive Access, Small Cargo, Affordable Launch [2]. The overall launch concept involves three stages. The first stage will consist of a reusable aircraft similar to a large scale Air Force fighter. The first stage will also utilize Mass Injection Pre-Compressor Cooling (MIPCC) turbojet engines that will propel the stage to approximately two hundred thousand feet before releasing the second and third rocket stages. The first stage will be similar to a large fighter of the F-22 class, although the turbofans will be that of the more available F100 class. The MIPCC system will be a plug-in addition to the engines to help high altitude performance. This stage will be not only a “Launch Platform”, but more of a first stage in that it will contribute significantly to the overall acceleration of the vehicle The second and third stages will consist of simple expendable rockets. Releasing the upper stages outside the atmosphere will reduce the loads on the stages as well as the risk of staging. Also by relying on the reusable portion for all atmospheric flight, the expendable stages can be designed simpler and therefore cheaper. The purpose of this project is to compare the published RASCAL numbers with those computed using a design methodology currently used in the Space System Design Laboratory (SSDL) at The Georgia Institute of Technology. When the initial Space Launch Corporation design was evaluated using the SSDL methodology it was found to fall short of the performance as well as the cost goals set by DARPA for the RASCAL program. The baseline vehicle was found to only carry 52 lbs to the 270 nmi sun synchronous orbit. Several alternatives were evaluated off of the baseline design. The best of these alternatives can meet DARPA’s performance goals and reach the cost goals of $5,000 per pound of payload with eight first stage vehicles flying 46 times per year for a total of 363 flights per year. Different economic cases were also evaluated to try and meet the cost goals in a less ambitious number of flights per year. It was found that if the DDT&E was paid for by another party (NASA, DOD, etc.) the cost goals can be met with just three vehicles flying 42 times per year for a total of 125 flights per year.
  • Thumbnail Image
    Item
    Residential Construction and Remodeling to Implement Healthy Home Principles
    (Georgia Institute of Technology, 2004-05) Jordan, Stacey
  • Thumbnail Image
    Item
    State Drought Plans in the United States: An Evaluation of Indicators and Triggers
    (Georgia Institute of Technology, 2004-05) Cavalcanti, Luiz F. N.
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    Evaluation of Multidisciplinary Optimization (MDO) Techniques Applied to a Reusable Launch Vehicle
    (Georgia Institute of Technology, 2004-04-29) Brown, Nichols
    Optimization of complex engineering systems has always been an integral part of design. Due to the size and complexity of aerospace systems the design of a whole system is broken down into multiple disciplines. Traditionally these disciplines have developed local design tools and computer codes (legacy codes) allowing them to perform optimization with respect to some aspect of their local discipline. Unfortunately, this approach can produce sub-optimal systems as the disciplines are not optimizing with respect to a consistent global objective. Multidisciplinary design optimization (MDO) techniques have been developed to allow for multidisciplinary systems to reach a global optimum. The industry accepted All-at-Once (AAO) technique has practical limitations and is confined to only small, conceptual level problems. New multi-level MDO techniques have been proposed which may allow for the global optimization of the large, complex systems involved in higher levels of design. Three of the most promising multi-level MDO techniques, Bi-Level Integrated System Synthesis (BLISS), Collaborative Optimization (CO) and Modified Collaborative Optimization (MCO) are applied, evaluated and compared in this study. The techniques were evaluated by applying them to the optimization of a next generation Reusable Launch Vehicle (RLV). The RLV model was composed of three loosely coupled disciplines, Propulsion, Performance, and Weights & Sizing, composed of stand-alone, legacy codes not originally intended for use in a collaborative environment. Results from the multi-level MDO techniques will be verified through the use of the AAO approach and their benefits measured against the traditional approach where the multiple disciplines are converged using the fixed point iteration (FPI) process. All the techniques applied will be compared against each other and rated qualitatively on such metrics as formulation and implementation difficulty, optimization deftness and convergence errors. i
  • Thumbnail Image
    Item
    A Case Study of the STS Indirect and Support Costs
    (Georgia Institute of Technology, 2004-04-23) Krevor, Zachary C.