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  • MECHANICAL ENGINEERING  (2)
  • ELECTRONICS  (1)
  • 1970-1974  (3)
  • 1960-1964
  • 1
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    The Backup-Gilbert method and its application to the electrical conductivity problem (1972)
    In:  CASI
    Details
    Publication Date: 2006-03-12
    Description: The theory of Backus and Gilbert gives a technique for solving the general linear inverse problem. Observational error and lack of data are shown to reduce the reliability of the solution in different ways: the former introduces statistical uncertainties in the model, while the latter smooths out the detail. Precision can be improved by sacrificing resolving power, and vice versa, so that some compromise may be made between the two in choosing the best model. Nonlinear inverse problems can be brought into the domain of the theory by linearizing about a typical solution. The inverse problem of electrical conductivity in the mantle is used to illustrate the Backus-Gilbert technique; an example of the tradeoff diagram is given.
    Keywords: ELECTRONICS
    Type: NASA. Ames Res. Center Math. of Profile Inversion; 8 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Fatigue life of high-speed ball bearings with silicon nitride balls (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Evaluation of hot-pressed silicon nitride as a rolling-element bearing material. Two grades of hot-pressed silicon nitride balls were tested under rolling contact conditions in a five-ball fatigue tester. A digital computer program was used to predict the dynamic performance characteristics and fatigue life of high-speed ball bearings with silicon nitride balls relative to that with bearings containing steel balls. The results obtained include the finding that fatigue spalls on silicon nitride balls are similar in appearance to those obtained with typical bearing steels.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 74-LUB-12 , American Society of Mechanical Engineers and American Society of Lubrication Engineers, Joint Lubrication Conference; Oct 08, 1974 - Oct 10, 1974; Montreal; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Correlation of elastohydrodynamic film thickness measurements for fluorocarbon type 2 ester, and polyphenyl ether lubricants (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A minimum films thickness correlation applicable to heavily loaded elastohydrodynamic (EHD) contacts was formulated from experimental data obtained by an X-ray transmission technique. The correlation, based on data generated with fluorocarbon, type II ester, and polyphenyl ether lubricants, extends a previous analysis developed from data for a synthetic paraffinic oil. The resulting correlation represents the data of the four lubricants reasonably well over a large range of operating conditions. Contained within the derived relation is a factor to account for the high-load dependence displayed by the measurements beyond that which is provided for by the theory. Thermal corrections applied to a commonly used film thickness formula showed little improvement to the general disagreement that exists between theory and test. Choice of contact geometry and material are judged to have a relatively mild influence on the form of the semiempirical model.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TN-D-7825 , E-7954
    Format: application/pdf
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