Recent Submissions

  • Computational Fluid Dynamics Validation of a Single, Central Nozzle Supersonic Retropropulsion Configuration 

    Cordell, Christopher E., Jr.; Braun, Robert D. (Georgia Institute of Technology, 2009-05)
    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 ...
  • Analysis of Human-System Interaction For Landing Point Redesignation 

    Chua, Zarrin K. (Georgia Institute of Technology, 2009-05-26)
    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 ...
  • Design Space Pruning Techniques for Low-Thrust, Multiple Asteroid Rendezvous Trajectory Design 

    Alemany, Kristina; Braun, Robert D. (Georgia Institute of Technology, 2007-09)
    In 2006, the 2nd Global Trajectory Optimization Competition (GTOC2) posed a “Grand Asteroid Tour” trajectory optimization problem, where participants were required to find the best possible low-thrust trajectory that ...
  • Mars Gravity Biosatellite: Engineering, Science, and Education 

    Korzun, Ashley M.; Braun, Robert D.; Wagner, Erika B.; Fulford-Jones, Thaddeus R.F.; Deems, Elizabeth C.; Judnick, Daniel C.; Keesee, John E. (Georgia Institute of Technology, 2007-09)
    The Mars Gravity Biosatellite is a novel program aimed at providing data on the effects of partial gravity on mammalian physiology. Physiological problems intrinsic to prolonged stays in microgravity have long been ...
  • A Value Proposition for Lunar Architectures Utilizing Propellant Re-supply Capabilities 

    Young, James; Wilhite, Alan (Georgia Institute of Technology, 2007-09)
    The NASA Exploration Systems Architecture Study (ESAS)ⁱⁱ produced a transportation architecture for returning humans to the moon affordably and safely while using commercial services for tasks such as cargo delivery to ...
  • Responsive Space: Concept Analysis, Critical Review, and Theoretical Framework 

    Saleh, Joseph H.; Dubos, Gregory (Georgia Institute of Technology, 2007-09)
    Customers’ needs are dynamic and evolve in response to unfolding environmental uncertainties. The ability of a company or an industry to address these changing customers’ needs in a timely and cost-effective way is a ...
  • Technology Readiness Level, Schedule Risk and Slippage in Spacecraft Design: Data Analysis and Modeling 

    Dubos, Gregory F.; Saleh, Joseph H.; Braun, Robert D. (Georgia Institute of Technology, 2007-09)
    Schedule slippage plagues the space industry, and is antinomic with the recent emphasis on space responsiveness. The Government Accountability Office has repeatedly noted the difficulties encountered by the Department ...
  • An Approach for Calculating the Cost of Launch Vehicle Reliability 

    Krevor, Zachary C.; Wilhite, Alan W. (Georgia Institute of Technology, 2007-09)
    The goal of this paper is to determine the cost of increasing launch vehicle reliability during conceptual design. The launch vehicle mission requirements are held constant while various reliability strategies are evaluated ...
  • The Gryphon: A Flexible Lunar Lander Design to Support a Semi-Permanent Lunar Outpost 

    Arney, Dale; Hickman, Joseph; Tanner, Philip; Wagner, John; Wilson, Marc; Wilhite, Alan W. (Georgia Institute of Technology, 2007-09)
    A lunar lander is designed to provide safe, reliable, and continuous access to the lunar surface by the year 2020. The NASA Exploration System Architecture is used to initially define the concept of operations, architecture ...
  • Survivability and Resiliency of Spacecraft and Space-Based Networks: a Framework for Characterization and Analysis, Version 2 

    Castet, Jean-Francois; Saleh, Joseph H. (Georgia Institute of Technology, 2008-09-09)
    Considerations of survivability and resiliency have always been of importance in the design and analysis of military systems. Over the past two decades, the importance of survivability and resiliency has expanded beyond ...
  • Survivability and Resiliency of Spacecraft and Space-Based Networks: a Framework for Characterization and Analysis, Version 1 

    Castet, Jean-Francois; Saleh, Joseph H. (Georgia Institute of Technology, 2008-09)
    Considerations of survivability and resiliency have always been of importance in the design and analysis of military systems. Over the past two decades, the importance of survivability and resiliency has expanded beyond ...
  • Survey of Global Optimization Methods for Low-Thrust, Multiple Asteroid Tour Missions 

    Alemany, Kristina; Braun, Robert D. (Georgia Institute of Technology, 2007-01)
    Electric propulsion has recently become a viable option for robotic missions, enabling shorter flight times, fewer required planetary gravity assists, smaller launch vehicles, and/or larger payloads. Trajectory design ...
  • Control Authority Network Analysis Applied to Lunar Outpost Deployment 

    Alemany, Kristina; Morse, Elisabeth L.; Easter, Robert W. (Georgia Institute of Technology, 2007-03)
    In order to return humans to the Moon, the Constellation Program will be required to operate a complex network of humans and spacecraft in several locations. This requires an early look at how decision-making authority ...
  • An Approximate Ablative Thermal Protection System Sizing Tool for Entry System Design 

    Dec, John A.; Braun, Robert D. (Georgia Institute of Technology, 2006-01)
    A computer tool to perform entry vehicle ablative thermal protection systems sizing has been developed. Two options for calculating the thermal response are incorporated into the tool. One, an industry-standard, high-fidelity ...
  • Entry Descent and Landing Challenges of Human Mars Exploration 

    Wells, Grant William; Lafleur, Jarret M.; Verges, Amanda; Manyapu, Kavya; Christian, John A., III; Lewis, Charity; Braun, Robert D. (Georgia Institute of Technology, 2006-02)
    Near-term capabilities for robotic spacecraft include a target of landing 1 - 2 metric ton payloads with a precision of about 10 kilometers, at moderate altitude landing sites (as high as +2 km MOLA). While challenging, ...
  • Design of a Long Endurance Titan VTOL Vehicle 

    Prakash, Ravi; Braun, Robert D.; Colby, Luke S.; Francis, Scott R.; Gündüz, Mustafa E.; Flaherty, Kevin W.; Lafleur, Jarret M.; Wright, Henry S. (Georgia Institute of Technology, 2006-03)
    Saturn's moon Titan promises insight into many key scientific questions, many of which can be investigated only by in situ exploration of the surface and atmosphere of the moon. This research presents a vertical takeoff ...
  • Probabilistic Cost, Risk, and Throughput Analysis of Lunar Transportation Architectures 

    Alemany, Kristina; Olds, John R. (Georgia Institute of Technology, 2006-03)
    The President's Vision for Space Exploration presents a need to determine the best architecture and set of vehicle elements in order to achieve a sustained human lunar exploration program. The Lunar Architecture Stochastic ...
  • System Architecture Modeling for Technology Portfolio Management Using ATLAS 

    Thompson, Robert W.; O’Neil, Daniel A. (Georgia Institute of Technology, 2006-03)
    Strategic planners and technology portfolio managers have traditionally relied on consensus-based tools, such as Analytical Hierarchy Process (AHP) and Quality Function Deployment (QFD) in planning the funding of technology ...
  • Ultra Lightweight Ballutes for Return to Earth from the Moon 

    Masciarelli, James P.; Lin, John K. H.; Ware, Joanne S.; Rohrschneider, Reuben R.; Braun, Robert D.; Bartels, Robert E.; Moses, Robert W.; Hall, Jeffery L. (Georgia Institute of Technology, 2006-05)
    Ultra lightweight ballutes offer revolutionary mass and cost benefits along with flexibility in flight system design compared to traditional entry system technologies. Under funding provided by NASA's Exploration Systems ...
  • An Entry Handbook for the Conceptual Design of Mars Missions 

    Wells, Grant William; Braun, Robert D. (Georgia Institute of Technology, 2006-05)
    The purpose of this investigation is to investigate trends in Mars entry, descent and landing conceptual mission design and propose a method of presenting this information as a handbook for conceptual design. The premise ...

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