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  • 1985-1989  (5)
  • 1
    facet.materialart.
    Unknown
    Structureborne noise investigations of a twin engine aircraft (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The interior noise of aircraft powered by advanced turbo-prop concepts is likely to have nonnegligible contributions from structureborne paths, these paths being those involving propeller loads transmitted to the structures of the lifting surfaces. As a means of examining these paths, structural measurements have been performed on a small twin-engine aircraft, and in addition analytical models of the structure have been developed. In this paper results from both portions of this study are presented.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 86-1905
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    All-theoretical prediction of cabin noise due to impingement of propeller vortices on a wing structure (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Reported calculations of structure-borne cabin noise for a small twin engine aircraft powered by tractor propellers rely on the following three-stage methodological breakup of the problem: (1) the unsteady-aerodynamic prediction of wing lift harmonics caused by the whipping action of the vortex system trailed from each propeller; (2) the associated wing/fuselage structural response; (3) the cabin noise field for the computed wall vibration. The first part--the estimate of airloads--skirts a full-fledged aeroelastic situation by assuming the wing to be fixed in space while cancelling the downwash field of the cutting vortices. The model is based on an approximate high-frequency lifting-surface theory justified by the blade rate and flight Mach number of application. Its results drive a finite-element representation of the wing accounting for upper and lower skin surfaces, spars, ribs, and the presence of fuel. The fuselage, modeled as a frame-stiffened cylindrical shell, is bolted to the wing.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 87-2681
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    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
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    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
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    Handling of oxygen in research experiments (1985)
    American Chemical Society
    Details
    Publication Date: 1985-05-01
    Print ISSN: 0021-9584
    Electronic ISSN: 1938-1328
    Topics: Chemistry and Pharmacology , Education
    Published by American Chemical Society
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