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  • 1
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    Component model reduction via the projection and assembly method (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The problem of acquiring a simple but sufficiently accurate model of a dynamic system is made more difficult when the dynamic system of interest is a multibody system comprised of several components. A low order system model may be created by reducing the order of the component models and making use of various available multibody dynamics programs to assemble them into a system model. The difficulty is in choosing the reduced order component models to meet system level requirements. The projection and assembly method, proposed originally by Eke, solves this difficulty by forming the full order system model, performing model reduction at the the system level using system level requirements, and then projecting the desired modes onto the components for component level model reduction. The projection and assembly method is analyzed to show the conditions under which the desired modes are captured exactly; to the numerical precision of the algorithm.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Proceedings of the 3rd Annual Conference on Aerospace Computational Control, Volume 2; p 778-791
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The Cassini spacecraft: Object oriented flight control software (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The Cassini Attitude and Articulation Control Subsystem (AACS) is responsible for determining and controlling the spacecraft attitude including instrument pointing, antenna pointing, and thrust vector pointing during velocity change maneuvers. The 12 year mission life, long round-trip light time, and extended periods of coast without continuous ground control drive the AACS flight software design in the directions of autonomy, fault tolerance, and modularity to accommodate planned upgrades in flight. The Cassini AACS Flight Software is depicted in increasing levels of detail using a Context Diagram, Architecture Diagrams (i.e., Dependency Diagrams), an Object Diagram for each object, and a Statechart (i.e., State Transition Diagram) for each object. The detail contained in the diagrams is enhanced and refined during the Requirements and Design Phases of both Subsystem and Software Development. Examples of all the diagrams as well as the criteria for object selection, the advantages of statecharts, and the ease of modifying the design to accommodate changes in scope are described.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: (ISSN 0065-3438); sic Space Science; U
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Proceedings of the 3rd Annual Conference on Aerospace Computational Control, volume 1 (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Conference topics included definition of tool requirements, advanced multibody component representation descriptions, model reduction, parallel computation, real time simulation, control design and analysis software, user interface issues, testing and verification, and applications to spacecraft, robotics, and aircraft.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-186446 , JPL-PUBL-89-45-VOL-1 , NAS 1.26:186446 , Nov 01, 1989; Oxnard, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Proceedings of the 3rd Annual Conference on Aerospace Computational Control, volume 2 (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This volume of the conference proceedings contain papers and discussions in the following topical areas: Parallel processing; Emerging integrated capabilities; Low order controllers; Real time simulation; Multibody component representation; User environment; and Distributed parameter techniques.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-186447 , JPL-PUBL-89-45-VOL-2 , NAS 1.26:186447 , Nov 01, 1989; Oxnard, CA; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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