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  • Other Sources  (5)
  • INSTRUMENTATION AND PHOTOGRAPHY  (5)
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  • 1
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    Performance of the new Efratom optically pumped rubidium frequency standards and their possible application in space relativity experiments (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The characteristics of Efratom optically pumped rubidium frequency standards are discussed. The Efratom units were compared with cesium beam and hydrogen maser standards and showed a stability of approximately 5 times 10 to the minus 12th power over two one-week periods. Dependency of frequency upon the environmental parameters of pressure, magnetic field, temperature, supply voltage, and acceleration was measured. A package of three units with automatic phase comparison and recording was designed and constructed to allow a measurement of relativistic effects on time with high accuracy during space missions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Proc. of the 4th Precise Time and Time Interval Planning Meeting; p 29-40
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Research study on stabilization and control modern sampled-data control theory (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The methods of continuous and discrete describing function analysis were applied to predicting the existence of self-sustained oscillations in the single-axis model of the large space telescope system with nonlinear control moment gyroscope friction characteristics. It is shown that the stability equations may be solved by a numerical-iterative technique using the describing function analysis, instead of the usual graphical methods. The numerical method is found to be effective in leading to a convergent solution rapidly, with an appropriate guess of the initial condition.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-120455
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Continuous and discrete describing function analysis of the LST system (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A describing function of the control moment gyros (CMG) frictional nonlinearity is derived using the analytic torque equation. Computer simulation of the simplified Large Space Telescope (LST) system with the analytic torque expression is discussed along with the transfer functions of the sampled-data LST system, and the discrete describing function of the GMC frictionality.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-120321
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A pulsed cesium spectral lamp for optical pumping studies (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two-bulb switchable pulsed spectral lamp with Cs and Xe for optical pumping studies
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; UGREVUE(
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    NASA TECHNICAL REPORTS
  • 5
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    Stability study of the Large Space Telescope /LST/ system with nonlinear CMG gimbal friction (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The purpose of the investigation reported upon is to study the existence and characteristics of self-sustained oscillations in the dynamic behavior of the Large Space Telescope (LST) system due to the presence of nonlinear gimbal friction in the control moment gyroscopes (CMGs). A continuous-data single-axis model of the LST is considered. A solid friction model is used to represent CMG gimbal friction. A rigorous mathematical model is derived for use in a continuous describing function analysis. Conditions for self-sustained oscillations are then determined.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 74-874 , Mechanics and Control of Flight Conference; Aug 05, 1974 - Aug 09, 1974; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
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