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  • 1
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    Integrated dynamic analysis simulation of space stations with controllable solar array (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A methodology is formulated and presented for the integrated structural dynamic analysis of space stations with controllable solar arrays and non-controllable appendages. The structural system flexibility characteristics are considered in the dynamic analysis by a synthesis technique whereby free-free space station modal coordinates and cantilever appendage coordinates are inertially coupled. A digital simulation of this analysis method is described and verified by comparison of interaction load solutions with other methods of solution. Motion equations are simulated for both the zero gravity and artificial gravity (spinning) orbital conditions. Closed loop controlling dynamics for both orientation control of the arrays and attitude control of the space station are provided in the simulation by various generic types of controlling systems. The capability of the simulation as a design tool is demonstrated by utilizing typical space station and solar array structural representations and a specific structural perturbing force. Response and interaction load solutions are presented for this structural configuration and indicate the importance of using an integrated type analysis for the predictions of structural interactions.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-112118
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Integrated dynamic analysis simulation of space stations with controllable solar arrays (supplemental data and analyses) (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Space station and solar array data and the analyses which were performed in support of the integrated dynamic analysis study. The analysis methods and the formulated digital simulation were developed. Control systems for space station altitude control and solar array orientation control include generic type control systems. These systems have been digitally coded and included in the simulation.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-112145
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The 136 MHZ/400 MHz earth station antenna-noise temperature prediction program for RAE-B (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A simulation study was undertaken to determine the 136 MHz and 400 MHz noise temperature of the ground network antennas which will track the RAE-B satellite during data transmission periods. Since the noise temperature of the antenna effectively sets the signal-to-noise ratio of the received signal, a knowledge of SNR will be helpful in locating the optimum time windows for data transmission during low noise periods. Antenna noise temperatures will be predicted for selected earth-based ground stations which will support RAE-B. Telemetry data acquisition will be at 400 MHz; tracking support at 136 MHz will be provided by the Goddard Range and Range Rate (RARR) stations. The antenna-noise temperature predictions will include the effects of galactic-brightness temperature, the sun, and the brightest radio stars. Predictions will cover the ten-month period from March 1, 1973 to December 31, 1973.
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-66047 , X-752-72-324
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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