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  • ASTRONAUTICS (GENERAL)  (3)
  • 1990-1994  (3)
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  • 1990  (3)
  • 1
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    Science and application payloads in the 90's (1990)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: An overview is conducted of the payloads under development for NASA to support space science and the Mission to Planet Earth. The science payloads reviewed include the Controls, Astrophysics, and Structures Experiment in Space (CASES), the Advanced Solar Observatory (ASO), the Laser Atmospheric Wind Sounder (LAWS), and the Lightning Imaging Sensor. The payloads are supported by the Extended Duration Orbiter, the Space Station Freedom, and an infrastructure that includes platforms in polar and geosynchronous orbits. The LAWS payload can provide data for global wind-profile measurements, and the ASO can coordinate solar-physics observations and study solar dynamic processes. The CASES payload is designed to investigate critical control technology for stabilizing and pointing large flexible structures in space for astrophysics missions.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Space Congress; Apr 24, 1990 - Apr 27, 1990; Cocoa Beach, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Assembly, disassembly and repair of large truss structures in space (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper addresses the problem of planning assembly, disassembly and repair sequences for large truss structures in space. First, the AND/OR graph representation scheme for mechanical assemblies is reviewed and extended to truss structures. The assembly, disassembly and repair sequence planning problem is then formulated as a graph search problem using assembly's AND/OR graph and appropriate cost functions. The general search problem, which is known to be exponential, is simplified by taking advantage of the symmetries that exist in truss structures. General cost functions for truss assembly are discussed.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: i-SAIRAS ''90: International Symposium on Artificial Intelligence, Robotics and Automation in Space; Nov 18, 1990 - Nov 20, 1990; Kobe; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Assembly planning for large truss structures in space (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The approach is based on a graph search algorithm. A relational data structure is used to represent a truss structure. There are four types of entities: units, faces, edges, and vertices. There are contain/contained relationships for every pair of entity types, as well as in-contact relationships between faces. A best-first algorithm constitutes the core of the planner. The cost function in the current implementation corresponds to a combination of the rigidity of the intermediate structures and the total distance to be traversed by the agent executing the assembly tasks.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: IEEE International Conference on Systems Engineering; Aug 09, 1990 - Aug 11, 1990; Pittsburgh, PA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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