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  • ACOUSTICS  (1)
  • 5'-O-demethyl-8-O-methyl-7-epi-dioncophylline A
  • resistance
  • enthalpy
  • 5'-O-demethyl-8-O-methyl-dioncophylline A
  • 1975-1979  (1)
  • 1
    Publication Date: 2019-06-27
    Description: Axial segmentation of acoustically absorbing liners in rectangular, circular or annual duct configurations is a very useful concept for obtaining higher noise attenuation with respect to the bandwidth of absorption as well as the maximum attenuation. As a consequence, advanced liner concepts are proposed which induce a modal energy transfer in both cross-sectional directions to further reduce the noise radiated from turbofan engines. However, these advanced liner concepts require three-dimensional geometries which are difficult to treat theoretically. A very simple three-dimensional problem is investigated analytically. The results show a strong dependence on the positioning of the liner for some incident source modes while the effect of three-dimensional segmentation appears to be negligible over the frequency range considered.
    Keywords: ACOUSTICS
    Type: NASA-TM-80118
    Format: application/pdf
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