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  • Man/System Technology and Life Support  (2)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
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  • 1
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    Control effectiveness characterization for state estimation and control on a highly flexible grid (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Control effectiveness tests of reaction wheel actuators on a highly flexible grid are reported herein. Analytic determination of actuator control effectiveness is accomplished with finite element modelling. Experimental determination is done with two algorithms. The first is an equation error parameter identification scheme which estimates the control coefficients of the second order difference equation model of each vibration mode. The second is a least square error algorithm using the same model. For both methods there is a lack of agreement with analytic prediction.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 86-2142
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Processing of nutritious, safe and acceptable foods from CELSS candidate crops (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-08-15
    Description: A controlled ecological life-support system (CELSS) is required to sustain life for long-duration space missions. The challenge is preparing a wide variety of tasty, familiar, and nutritious foods from CELSS candidate crops under space environmental conditions. Conventional food processing technologies will have to be modified to adapt to the space environment. Extrusion is one of the processes being examined as a means of converting raw plant biomass into familiar foods. A nutrition-improved pasta has been developed using cowpea as a replacement for a portion of the durum semolina. A freeze-drying system that simulates the space conditions has also been developed. Other technologies that would fulfill the requirements of a CELSS will also be addressed.
    Keywords: Man/System Technology and Life Support
    Type: Advances in space research : the official journal of the Committee on Space Research (COSPAR); 18; 2-Jan; 241-50
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Conditions and constraints of food processing in space (1994)
    In:  Other Sources
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    Publication Date: 2019-08-15
    Description: Requirements and constraints of food processing in space include a balanced diet, food variety, stability for storage, hardware weight and volume, plant performance, build-up of microorganisms, and waste processing. Lunar, Martian, and space station environmental conditions include variations in atmosphere, day length, temperature, gravity, magnetic field, and radiation environment. Weightlessness affects fluid behavior, heat transfer, and mass transfer. Concerns about microbial behavior include survival on Martian and lunar surfaces and in enclosed environments. Many present technologies can be adapted to meet space conditions.
    Keywords: Man/System Technology and Life Support
    Type: Food technology (ISSN 0015-6639); 48; 9; 113-22, 127, 204
    Format: text
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    NASA TECHNICAL REPORTS
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