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  • Other Sources  (4)
  • Lunar and Planetary Science and Exploration  (4)
  • METEOROLOGY AND CLIMATOLOGY
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE
  • 2005-2009  (4)
  • 1
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    Experiences applying Formal Approaches in the Development of Swarm-Based Space Exploration Systems (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: NASA is researching advanced technologies for future exploration missions using intelligent swarms of robotic vehicles. One of these missions is the Autonomous Nan0 Technology Swarm (ANTS) mission that will explore the asteroid belt using 1,000 cooperative autonomous spacecraft. The emergent properties of intelligent swarms make it a potentially powerful concept, but at the same time more difficult to design and ensure that the proper behaviors will emerge. NASA is investigating formal methods and techniques for verification of such missions. The advantage of using formal methods is the ability to mathematically verify the behavior of a swarm, emergent or otherwise. Using the ANTS mission as a case study, we have evaluated multiple formal methods to determine their effectiveness in modeling and ensuring desired swarm behavior. This paper discusses the results of this evaluation and proposes an integrated formal method for ensuring correct behavior of future NASA intelligent swarms.
    Keywords: Lunar and Planetary Science and Exploration
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Room to Live: the sizing of Lunar and Martian Habitats (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In order for man to return to space or extra terrestrial bodies for long duration missions it is important that adequate habitat volume be defined early to avoid costly delays and redesign. To properly define a habitat volume two major factors need to be considered. The first factor is the free or open space. This is the space that allows the crew room to move about the habitat. This space will vary based on crew size and length of the mission. The second major factor is the stowage space required for equipment and supplies. This includes both fixed volumes and consumables. Fixed volumes include items such as tools, communication equipment, Advanced Life Support (ALS) equipment, and support equipment. Consumables include items like filters, food, water and oxygen. This space is also dependent on crew size and mission length. A review of past missions into alien environments, such as deep sea habitats as well as space based habitats will be used to validate the assumption made in this paper. Once these key factors are defined trades must be run to optimize the overall volume of a habitat. This includes trades of disposable vs. reusable for items such as clothing, dishes, and water. Another factor to consider is the availability of in situ resources to aid in the construction of the habitat structure as well as re-supply of consumable items. A review of past missions into alien environments, such as deep sea habitats as well as space based habitats will be used to validate the assumption made in this paper. The result is a habitat sizing tool to provide a first order estimate of habitat volumes for extended mission to the surface of the moon and Mars.
    Keywords: Lunar and Planetary Science and Exploration
    Type: AIAA/Habitation 2006; Feb 06, 2006; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Gas Dynamics and Kinetics in the Cometary Coma: Theory and Observations (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Our ability to describe the physical state of the expanding coma affects fundamental areas of cometary study both directly and indirectly. In order to convert measured abundances of gas species in the coma to gas production rates, models for the distribution and kinematics of gas species in the coma are required. Conversely, many different types of observations, together with laboratory data and theory, are still required to determine coma model attributes and parameters. Accurate relative and absolute gas production rates and their variations with time and from comet to comet are crucial to our basic understanding of the composition and structure of cometary nuclei and their place in the solar system. We review the gas dynamics and kinetics of cometary comae from both theoretical and observational perspectives, which are important for understanding the wide variety of physical conditions that are encountered.
    Keywords: Lunar and Planetary Science and Exploration
    Type: COMET II; 523
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    In Situ Resource-Based Lunar and Martian Habitat Structures Development at NASA/MSFC (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: As the nation prepares to return to the Moon and subsequently to Mars, it is apparent that the viability of long duration visits with appropriate radiation shielding/crew protection, hinges on the development of habitat structures, preferably in advance of a manned landing, and preferably utilizing in-situ resources. A relatively large number of habitat structure configurations can be developed from a relatively small set of in-situ resource-based construction products, including, blocks, raw regolith, reinforced concrete, and glass products. A much larger group of habitat designs can be developed when "imported" material are brought from Earth, including thin films and liners, and foldable, or expandable metal structures. These, and other technologies have been identified, and subjected to a rigorous trade study evaluation with respect to exploration and other performance criteria. In this paper, results of this trade study will be presented, as well as various habitat structure design concepts and concepts for construction automation. Results of initial tests aimed at concrete, block and glass production using Lunar regolith simulants will also be presented. Key issues and concerns will be discussed, as well as design concepts for a Lunar environment testbed to be developed at MSFC's Microgravity Development Laboratory. (MDL).
    Keywords: Lunar and Planetary Science and Exploration
    Type: AIAA Paper 2005-2704 , AIAA 1st Exploration Conference; Jan 31, 2005 - Feb 01, 2005; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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