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  • 1
    facet.materialart.
    Unknown
    Dynamic loading on parallel shaft gears (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A computer-based analysis of the dynamic effects of spur gear systems is presented. The method of analysis with its associated computer code is capable of determining the dynamic response of spur gear systems having involute tooth profiles and standard contact ratios. Various parameters affecting the system dynamic behavior are examined. Numerical results of the analysis are compared with semi-empirical formulae, AGMA (American Gear Manufacturers Association) formulae, and experimental data. A close correlation with the experimental data is obtained.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-179473 , NAS 1.26:179473 , UC-MIE-051586-19
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Dynamic analysis of straight and involute tooth forms (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The effect of load speed on straight and involute tooth forms is studied using several finite-element models. It is found that for rapidly rotating gears and sprockets, the load speed along the tooth surface can significantly affect the tooth vibration. Indeed, it is found that for sufficiently high load speeds and for sufficiently slender tooth forms, the tooth deflection can, at times, be directed opposite to the load direction. Comparisons are made of various dynamic models of gear and sprocket teeth. It is shown that for stubby tooth forms there is considerable difference between results obtained with finite element models and results obtained with Timoshenko beam models. Finally, it is shown that gear or sprocket vibrations can be induced by the shape of the tooth form itself. This effect becomes increasingly significant at higher speeds.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 84-DET-226
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Profile modification to minimize spur gear dynamic loading (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An analytical computer simulation program for dynamic modeling of low-contact-ratio spur gear systems is presented. The procedure computes the static transmission error of the gears operating under load and uses a fast Fourier transform to generate the frequency spectrum of the static transmission error at various tooth profile modifications. The dynamic loading response of an unmodified (perfect involute) gear pair was compared with that of gears with various profile modifications. Correlations were found between various profile modifications and the resulting dynamic loads. An effective error, obtained from frequency domain analysis of the static transmission error of the gears, gave a very good indication of the optimum profile modification to reduce gear dynamic loading. Design curves generated by dynamic simulation at various profile modifications are given for gear systems operated at various loads. Optimum profile modifications can be determined from these design curves for improved gear design.
    Keywords: MECHANICAL ENGINEERING
    Type: 1989 International Power Transmission and Gearing Conference; Apr 25, 1989 - Apr 28, 1989; Chicago, IL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Dynamic loading of spur gears with linear or parabolic tooth profile modifications (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A computer simulation was conducted to investigate the effects of both linear and parabolic tooth profile modification on the dynamic response of low-contact-ratio spur gears. The effect of the total amount of modification and the length of the modification zone were studied at various loads and speeds to find the optimal profile modification for minimal dynamic loading. Design charts consisting of normalized maximum dynamic load curves were generated for gear systems operated at various loads and with different tooth profile modification. An optimum profile modification can be determined from these design charts to minimize the dynamic loads of spur gear systems.
    Keywords: MECHANICAL ENGINEERING
    Type: 1989 International Power Transmission and Gearing Conference; Apr 25, 1989 - Apr 28, 1989; Chicago, IL; United States
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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