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  • 1
    Publication Date: 2019-06-27
    Description: Stability analyses and simulation data and results are presented for an initial Control Moment Gyroscope system proposed for the Apollo Telescope Mount cluster (later named Skylab) using momentum vector feedback. A compensation filtering technique is presented which significantly improved analytical and simulation performance of the system. This technique is quite similar to the complementary filtering technique and represents an early NASA application.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-81827
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-27
    Description: An Integrated Power and Attitude Control System (IPACS) concept with potential application to a broad class of space missions is discussed. A description is given of the basic concept of combining the onboard energy storage and attitude control functions by storing energy in spinning flywheels which are used to provide control torques. A shuttle-launched Research and Applications Module (RAM) A303B solar-observatory mission having stringent pointing requirements (1.0 arc second) is selected to investigate possible interactions between energy storage and attitude control. A simulation of this spacecraft involving actual laboratory-model control-system hardware is presented. Simulation results are discussed which indicate that the IPACS concept, even in a failure-mode configuration, can readily meet the RAM A303B pointing requirements.
    Keywords: SPACE VEHICLES
    Type: NASA-TN-D-7459 , L-8791
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-13
    Description: A study to determine the viability and application of a system capable of performing the dual function of power storage/generation and attitude control has been conducted. Results from the study indicate that an integrated power/attitude control system (IPACS) can satisfy future mission requirements while providing significant savings in weight, volume, and cost over conventional systems. A failure-mode configuration of an IPACS was applied to a shuttle-launched RAM free-flyer and simulated using make-do hardware linked to a hybrid computer. Data from the simulation runs indicate that control interactions resulting from heavy power demands have minimal effect on system control effectiveness. The system was shown to be capable of meeting the stringent pointing requirements of 1 arc-second while operating under the influence of an orbital disturbance environment and during periods of momentum variations imposed by energy transfer requirements.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Intersociety Energy Conversion Engineering Conference; Aug 26, 1974 - Aug 30, 1974; San Francisco, CA
    Format: text
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  • 4
    Publication Date: 2019-06-27
    Description: Computerized onboard expeditious monitor and maintenance analyst /EMMA/ for automatic spacecraft system fault isolation and repair
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-TN-D-5725
    Format: application/pdf
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  • 5
    Publication Date: 2019-06-27
    Description: Maxwell equations and equations of massive-vector- meson fields in spatially homogeneous Bianchi cosmologies, obtaining formula for homogeneous EM field
    Keywords: SPACE SCIENCES
    Type: ; YAL SOCIETY (
    Format: text
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  • 6
    Publication Date: 2019-07-12
    Description: Theories concerning the resonance which gives rise to the tidal heating of Io are discussed. Yoder's (1979) suggestion that the resonance is maintained by tides raised on Jupiter by Io is examined along with the proposal of Greenberg (1982) that with smaller Jovian torque the system could be evolving away from resonance. The significance of Lieske's (1986) finding of a much smaller than expected negative value for Io's orbital acceleration is addressed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 323; 789-791
    Format: text
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  • 7
    Publication Date: 2019-08-28
    Description: This single-topic brochure is for high school physical science teachers to use in introducing students to extragalactic astronomy. The material is presented in three parts: the fundamental content of extragalactic astronomy; modern discoveries delineated in greater detail; and a summary of the earlier discussions within the structure of the Big-Bang Theory of evolution. Each of the three sections is followed by student exercises (activities, laboratory projects, and questions-and-answers). The unit close with a glossary which explains unfamilar terms used in the text and a collection of teacher aids (literature references and audiovisual materials for utilization in further study).
    Keywords: ASTRONOMY
    Type: NASA-EP-129
    Format: application/pdf
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