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  • 1
    facet.materialart.
    Unknown
    Noise transmission into semicylindrical enclosures through discretely stiffened curved panels (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An analytical study of sound transmission into semicylindrical enclosures through discretely stiffened curved elastic panels is presented. The transmitted sound is estimated by solving the acoustic wave equation for the interior acoustic field, a Galerkin-like method being used. This solution is then coupled to the vibration of the stiffened panels. The response characteristics of these panels are determined by using a modal analysis where the modes are obtained by the finite element-strip method. Numerical results include spectra of the interior sound pressure due to white noise, turbulent boundary layer and propeller noise inputs.
    Keywords: ACOUSTICS
    Type: Journal of Sound and Vibration; 85; Nov. 8
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Noise transmission and attenuation for business aircraft (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes analytical studies applicable for estimating the effects of noise transmission into light aircraft and commuter type aircraft. The propeller noise and turbulent boundary layer noise are considered. The analytical model described uses modal methods and incorporates flat stiffened panels for flat sided sidewalls and curved stiffened panels for cylindrical enclosures. The numerical results include noise attenuation with add-on treatments and the sensitivity of the transmitted noise to the discrete stiffening of the sidewall panels.
    Keywords: ACOUSTICS
    Type: SAE PAPER 810561 , Business Aircraft Meeting and Exposition; Apr 07, 1981 - Apr 10, 1981; Wichita, KS
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Noise transmission and attenuation by stiffened panels (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An analytical study of noise transmission into semi-cylindrical and rectangular acoustic enclosures due to turbulent boundary layer pressure and propeller noise (prop-fan) is presented. The structural noise transmission models include a single panel, discretely stiffened elastic panel and stiffened viscoelastic sandwich panel. Response characteristics of the stiffened panels are evaluated using a transfer matrix procedure. The interior noise field is determined by a Galerkin-like method. The effect on interior noise due to aerodynamic surface flow, cavity back-up pressure, pressurization, mass, stiffness, and damping addition to the structure is investigated. It is shown that stiffened viscoelastic sandwich panels, while providing the same stiffening benefits as an equivalent elastic panel, could significantly reduce vibration levels and subsequently give similar benefits for interior noise control.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 80-1034 , Aeroacoustics Conference; Jun 04, 1980 - Jun 06, 1980; Hartford, CT
    Format: text
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    NASA TECHNICAL REPORTS
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