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  • 1
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    Structureborne noise measurements on a small twin-engine aircraft (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Structureborne noise measurements performed on a twin-engine aircraft (Beechcraft Baron) are reported. There are two overall objectives of the test program. The first is to obtain data to support the development of analytical models of the wing and fuselage, while the second is to evaluate effects of structural parameters on cabin noise. Measurements performed include structural and acoustic responses to impact excitation, structural and acoustic loss factors, and modal parameters of the wing. Path alterations include added mass to simulate fuel, variations in torque of bolts joining wing and fuselage, and increased acoustic absorption. Conclusions drawn regarding these measurements are presented.
    Keywords: ACOUSTICS
    Type: NASA-CR-4137 , NAS 1.26:4137 , U-1541-349-PT-2
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Analytical modeling of the structureborne noise path on a small twin-engine aircraft (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The structureborne noise path of a six passenger twin-engine aircraft is analyzed. Models of the wing and fuselage structures as well as the interior acoustic space of the cabin are developed and used to evaluate sensitivity to structural and acoustic parameters. Different modeling approaches are used to examine aspects of the structureborne path. These approaches are guided by a number of considerations including the geometry of the structures, the frequency range of interest, and the tractability of the computations. Results of these approaches are compared with experimental data.
    Keywords: ACOUSTICS
    Type: NASA-CR-4136 , NAS 1.26:4136 , U-1541-349-PT-1
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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