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  • 1
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    The Coupling of Flexural Propeller Vibrations with the Torsional Crankshaft Vibrations (1943)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: The exact mathematical treatment of the problem is possible by replacing the propeller blade by a homogeneous prismatic rod. Conclusions can them be drawn as to the behavior of an actual propeller, since tests on propeller blades have indicated a qualitative agreement with the homogeneous rod. The natural frequencies are determined and the stressing of the systems under the various vibration modes are discussed.
    Keywords: Mechanical Engineering
    Type: NACA-TM-1051 , Jahrbuch 1938 der Deutschen Luftfahrtforschung; 141-159
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Vibration Survey of Blades in 19XB Axial-Flow Compressor (1947)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Strain-gage measurements were taken under operating conditions from blades of various stages of the 19XB axial-flow compressor in an effort to determine the reason for failures in the seventh and tenth stages. First bending-mode vibrations were detected in the first five stages of the compressor caused by each integral multiple of rotor speed from three through ten. Lead-wire failures in the last five stages resulted in incomplete data. The dynamic-vibration frequencies at various rotor speeds were compared with statically measured frequencies analytically corrected for the influence of centrifugal force. Large increases in vibration ani~litude with increased pressure ratio were observed. During surging operation, blade vibrations were not present. The effects of pressure ratio and surge indicate the existence of aerodynamic excitation as the cause of the blade vibrations.
    Keywords: Mechanical Engineering
    Type: NACA-RM-E7D09
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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