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  • 1
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    A simple method for determining the bending moment equation that includes vehicle elastic and sloshing modes and a numerical example (1964)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Bending moment of vehicle in terms of control parameters - vehicle elastic and sloshing modes
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Lubricant selection for gear designers (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Guide for gear designers, consisting of theory, calculations, charts, curves and references, explains lubrication requirements for gears to insure maximum performance. Mechanical and service variables are considered in order to obtain optimum gear performance under severe operating conditions.
    Keywords: MATERIALS
    Type: LEW-11483
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Elastohydrodynamic principles applied to the design of helicopter components. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Elastohydrodynamic principles affecting the lubrication of transmission components are presented and discussed. Surface temperatures of the transmission bearings and gears affect elastohydrodynamic film thickness. Traction forces and sliding as well as the inlet temperature determine surface temperatures. High contact ratio gears cause increased sliding and may run at higher surface temperatures. Component life is a function of the ratio of elastohydrodynamic film thickness to composite surface roughness. Lubricant starvation reduces elastohydrodynamic film thickness and increases surface temperatures. Methods are presented which allow for the application of elastohydrodynamic principles to transmission design in order to increase system life and reliability.
    Keywords: STRUCTURAL MECHANICS
    Type: AHS PREPRINT 770 , Annual National Forum; May 09, 1973 - May 11, 1973; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Biological-Physical Coupling in the Gulf of Maine: Satellite and Model Studies of Phytoplankton Variability (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The goals of this project were to acquire, process, QC, archive and analyze SeaWiFS chlorophyll fields over the Gulf of Maine and Scotia Shelf region. The focus of the analysis effort was to calculate and quantify seasonality and interannual. variability of SeaWiFS-measured phytoplankton biomass in the study area and compare these to physical forcing and hydrography. An additional focus within this effort was on regional differences within the heterogeneous biophysical regions of the Gulf of Maine / Scotia Shelf. Overall goals were approached through the combined use of SeaWiFS and AVHRR data and the development of a coupled biology-physical numerical model.
    Keywords: Life Sciences (General)
    Type: NRA-97-MTPE-01 , 2002 Ocean Sciences Meeting HI: Seasonal and Interannual Phytoplankton Variability in the Gulf of Maine; Jan 01, 2002; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Lubricants and Additives Affect Spur-Gear Fatigue (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Surface-fatigue tests conducted with AISI 9310 steel spur gears show surface-fatigue life of AISI 9310 steel spur gears increased as much as 400 percent by addition of small amount of phosphorus-type extreme-pressure (EP) additive in lubricant. Antiwear or EP additives either absorbed onto surface or react with surface to form protective coating or surface film. Boundary film provides barrier that prevents contact of metal surfaces and provides low shear strength, which reduces friction coefficient below base metal.
    Keywords: MATERIALS
    Type: LEW-14314 , NASA Tech Briefs (ISSN 0145-319X); 10; 5; P. 84
    Format: text
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    NASA TECHNICAL REPORTS
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