http://smartech.gatech.edu/handle/1853/9435 Search the Channel search http://smartech.gatech.edu/simple-search http://smartech.gatech.edu/handle/1853/10597 Title: First Annual Space Systems Engineering Conference. Papers listing <br/> <br/>Abstract: A listing of all papers and presentations from the First Space Systems Engineering Conference held in Atlanta Georgia, November 8-11, 2005. Additional materials: agenda and map from the conference ; pre conference flyer <br/> <br/>Description: This conference features the work of authors from: Georgia Tech’s Space Systems Design Lab, Aerospace Systems Design Lab, School of Aerospace Engineering, Georgia Tech Research Institute; NASA’s Jet Propulsion Laboratory, Marshall Space Flight Center, Goddard Space Flight Center, Langley Research Center; and other aerospace industry and academic institutions http://smartech.gatech.edu/handle/1853/8044 Title: The Space Propulsion Sizing Program <br/> <br/>Authors: Scher, Michael D.; North, David <br/> <br/>Abstract: The Space Propulsion Sizing Program is an advanced tool to facilitate vehicle design and broad system-level trade studies. It was designed to provide a simple and reliable means for rapid propulsion trade studies during the conceptual design phase. This is accomplished through a combination of mass estimating relationships, bottom-up calculations, and historical data to size several vehicle subsystems. Microsoft Excel and Visual BASIC were selected as the medium for the application of these methods. Through the versatility of Visual BASIC, several output modes are available for the vehicle mass breakdown and geometry estimates. The capability and reliability of this unique tool has been demonstrated by comparing estimates to real vehicles. <br/> <br/>Description: This conference features the work of authors from: Georgia Tech’s Space Systems Design Lab, Aerospace Systems Design Lab, School of Aerospace Engineering, Georgia Tech Research Institute; NASA’s Jet Propulsion Laboratory, Marshall Space Flight Center, Goddard Space Flight Center, Langley Research Center; and other aerospace industry and academic institutions http://smartech.gatech.edu/handle/1853/8045 Title: An Auction Algorithm for Optimal Satellite Refueling <br/> <br/>Authors: Salazar, Alexandros; Tsiotras, Panagiotis <br/> <br/>Abstract: Satellite refueling can extend the lifetime of satellite constellations. Peer-to-peer satellite refueling in particular has the potential to make the most efficient use of the fuel contained in the constellation by redistributing it as on a need-to basis. In this paper we present an alternative implementation of P2P refueling, namely pairing up fuel sufficient satellites with fuel deficient satellites so that they can refuel each other and guarantee that each satellite has more than a certain baseline amount of fuel. To solve this problem we make use of the auction algorithm, which is implemented in a distributed context. Asynchronous bids have been used to illustrate the robustness of the algorithm. <br/> <br/>Description: This conference features the work of authors from: Georgia Tech’s Space Systems Design Lab, Aerospace Systems Design Lab, School of Aerospace Engineering, Georgia Tech Research Institute; NASA’s Jet Propulsion Laboratory, Marshall Space Flight Center, Goddard Space Flight Center, Langley Research Center; and other aerospace industry and academic institutions http://smartech.gatech.edu/handle/1853/8046 Title: Design and Operation of Micro-Gravity Dynamics and Controls Laboratories <br/> <br/>Authors: Saenz-Otero, Alvar; Miller, David W. <br/> <br/>Abstract: The cost and complexity of maturing spacecraft dynamics and controls technology increases dramatically as the developer needs to demonstrate functionality in the space environment. Due to the high cost and infrequent opportunities to exercise such technology in space, dedicated free-flyers are developed which integrate a number of high risk technologies. As the budget expands and real or perceived risk is recognized, schedules extend and technologies are reduced or removed. Pushing advanced technology to its limits in an operational environment is fundamentally at odds with the risk-intolerant environment of space, leading to high costs and delayed testing. The MIT Space Systems Laboratory has taken an alternative approach by developing a family of dynamics and controls laboratories that have operated on Shuttle, Mir, and ISS. By designing the laboratories to not ensure safety through software design, as well as operating within the interior of these vehicles, the risk-tolerant and technically aggressive nature of a terrestrial laboratory has been emulated in the long duration micro-gravity of space. This paper will present the various laboratory design features that have led to the low cost of this technology maturation approach: including modularity; platforming; virtual presence; and facilitation of the iterative research process. <br/> <br/>Description: This conference features the work of authors from: Georgia Tech’s Space Systems Design Lab, Aerospace Systems Design Lab, School of Aerospace Engineering, Georgia Tech Research Institute; NASA’s Jet Propulsion Laboratory, Marshall Space Flight Center, Goddard Space Flight Center, Langley Research Center; and other aerospace industry and academic institutions