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  • 1
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    Determination of Principal Curvatures and Contact Ellipse for Profile Crowned Helical Gears (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Helical gears with localized bearing contact of tooth surfaces achieved by profile crowning of tooth surfaces are considered. Profile crowning is provided by application of two imaginary rack-cutters with mismatched surfaces. The goal is to determine the dimensions and orientation of the instantaneous contact ellipse that requires the determination of principle curvatures of pinion-gear tooth surfaces. A simplified solution to this problem is proposed based on the approach development for correlation of principal curvatures and directions of generating and generated tooth surfaces. The obtained equations are applied for profile crowning where the normal profiles of the rack-cutters are either a circular arc or a straight line.
    Keywords: Mechanical Engineering
    Type: Journal of Mechanical Design; Volume 121; 107-111
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Computerized Simulation of Meshing of Conventional Helical Involute Gears and Modification of Geometry (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An approach is proposed for computerized simulation of meshing of aligned and misaligned involute helical gears. Algorithms for TCA (Tooth Contact Analysis) computer programs were developed. Influence of misalignment on the shift of the bearing contact and transmission errors has been investigated. Numerical examples that illustrate the developed theory are provided.
    Keywords: Mechanical Engineering
    Type: NASA-TM-107451 , E-10732 , NAS 1.15:107451 , ARL-TR-1370
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Liquid cryogenic lubricant (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fluorinated polyethers are suitable lubricants for rolling-element bearings in cryogenic systems. Lubrication effectiveness is comparable to that of super-refined mineral oil lubricants operating at room temperature.
    Keywords: MACHINERY
    Type: LEW-11075
    Format: application/pdf
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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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  • 5
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    Analysis of Lubricant Jet Flow (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Computer program, IMPOUT 2, developed using newly-established "limit formulas" to prevent lubricant non-impingement on pinion. Program used to analyze impingement depth on gear teeth for oil jet located at out-of-mesh position with arbitrary offset and inclination angles and with arbitrary addendum and center-distance modification. IMPOUT 2 program written in ANSI FORTRAN IV for use on CDC 750.
    Keywords: MACHINERY
    Type: LEW-14242 , NASA Tech Briefs (ISSN 0145-319X); 10; 2; P. 104
    Format: text
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  • 6
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    Vibration Signature Analysis of a Faulted Gear Transmission System (1996)
    In:  Other Sources
    Details
    Publication Date: 2019-08-16
    Description: A comprehensive procedure in predicting faults in gear transmission systems under normal operating conditions is presented. Experimental data were obtained from a spiral bevel gear fatigue test rig at NASA/Lewis. Time-synchronous-averaged vibration data were recorded throughout the test as the fault progressed from a small single pit to severe pitting over several teeth, and finally tooth fracture. A numerical procedure based on the Wigner-Ville distribution was used to examine the time-averaged vibration data. Results from the Wigner-Ville procedure are compared to results from a variety of signal analysis techniques that include time-domain analysis methods and frequency analysis methods. Using photographs of the gear tooth at various stages of damage, the limitations and accuracy of the various techniques are compared and discussed. Conclusions are drawn from the comparison of the different approaches as well as the applicability of the Wigner-Ville method in predicting gear faults.
    Keywords: Mechanical Engineering
    Type: AIAA Paper 94-2937 , E-8914-1 , Journal of Propulsion and Power (ISSN 0748-4658); 12; 2; 289-295
    Format: text
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