SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS
A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 44, ISSUE 6 - March 24, 2006
20 SPACECRAFT PROPULSION AND POWER
Includes main propulsion systems and components, e.g., rocket engines; and spacecraft auxiliary power sources.
For related information see also 07 Aircraft Propulsion and Power, 28 Propellants and Fuels, 15 Launch Vehicles and Launch Operations, and 44 Energy Production and Conversion.
20060007913 Department of Energy, Washington, DC, USA
Energy Tips-Motor System. Extend the Operating Life of Your Motor
January 2005; 6 pp.; In English Report No.(s): DE2005-15020347; No Copyright; Avail.: Department of Energy Information Bridge
Two-page tip sheet on motor efficiency measures and optimizing industrial motor-driven systems. NTIS
Energy Conservation; Service Life
20060008082 Department of Energy, Washington, DC, USA
Energy Tips - Motor Systems. When to Purchase NEMAPremium(Trade Mark) Efficiency Motors. Motor Systems Tip Sheet No. 1
Sep. 2005; 6 pp.; In English Report No.(s): DE2005-15020341; DOE/GO-102005-2019; No Copyright; Avail.: Department of Energy Information Bridge
Two-page tip sheet on motor efficiency measures and optimizing industrial motor-driven systems. NTIS
Energy Conservation; Motors
20060008714 NASA Glenn Research Center, Cleveland, OH, USA
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Gas Foil Bearings for Space Propulsion Nuclear Electric Power Generation
Howard, Samuel A.; DellaCorte, Christopher; February 2006; 17 pp.; In English; Original contains color and black and white illustrations Report No.(s): NASA/TM-2006-214115; E-15448; No Copyright; Avail.: CASI: A03, Hardcopy
The choice of power conversion technology is critical in directing the design of a space vehicle for the future NASA mission to Mars. One candidate design consists of a foil bearing supported turbo alternator driven by a helium-xenon gas mixture heated by a nuclear reactor. The system is a closed-loop, meaning there is a constant volume of process fluid that is sealed from the environment. Therefore, foil bearings are proposed due to their ability to use the process gas as a lubricant. As such, the rotor dynamics of a foil bearing supported rotor is an important factor in the eventual design. The current work describes a rotor dynamic analysis to assess the viability of such a system. A brief technology background, assumptions, analyses, and conclusions are discussed in this report. The results indicate that a foil bearing supported turbo alternator is possible, although more work will be needed to gain knowledge about foil bearing behavior in helium-xenon gas. Author
Foil Bearings; Gas Bearings; Nuclear Electric Power Generation; Rotor Dynamics; Turbogenerators; Vapor Phase Lubrication
Source: NASA
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