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  • 1
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    Determining targets for multi-stage adaptive tests using integer programming (2010)
    Elsevier
    Details
    Publication Date: 2010-09-01
    Print ISSN: 0377-2217
    Electronic ISSN: 1872-6860
    Topics: Mathematics , Economics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Acoustic fatigue: Overview of activities at NASA Langley (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A number of aircraft and spacecraft configurations are being considered for future development. These include high-speed turboprop aircraft, advanced vertical take-off and landing fighter aircraft, and aerospace planes for hypersonic intercontinental cruise or flight to orbit and return. Review of the acoustic environment expected for these vehicles indicates levels high enough that acoustic fatigue must be considered. Unfortunately, the sonic fatique design technology used for current aircraft may not be adequate for these future vehicles. This has resulted in renewed emphasis on acoustic fatigue research at the NASA Langley Research Center. The overall objective of the Langley program is to develop methods and information for design of aerospace vehicles that will resist acoustic fatigue. The program includes definition of the acoustic loads acting on structures due to exhaust jets of boundary layers, and subsequent determination of the stresses within the structure due to these acoustic loads. Material fatigue associated with the high frequency structural stress reversal patterns resulting from acoustic loadings is considered to be an area requiring study, but no activity is currently underway.
    Keywords: ACOUSTICS
    Type: NASA-TM-89143 , NAS 1.15:89143
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Effect of boundary conditions on dynamic strain response of rectangular panels (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analytical and experimental research program has been initiated at NASA Langley to investigate the strain response of panels under severe thermal and/or acoustic loads. The overall purpose of this program is to develop an analytical model that predicts the stresses and strains leading to sonic fatigue failure in advanced aircraft and aerospace structures. Previous experiments, analyses, and results of this program are reviewed. The analytical modeling refinements and their effects on the calculation of strain are discussed, considering the inclusion of in-plane motion at the panel boundary; the use of the multiterm, multimode Ritz method; and the introduction of transverse stiffness at the boundary. Finally, the findings of the analytical modeling investigation are summarized.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 87-0935
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Noise Transmission Loss of a Rectangular Plate in an Infinite Baffle (1985)
    In:  CASI
    Details
    Publication Date: 2019-11-23
    Description: An improved analytical procedure was developed that allows for the efficient calculation of the noise transmission characteristics of a finite rectangular plate. Both isotropic and symmetrically laminated composite plates are considered. The plate is modeled with classic thin-plate theory and is assumed to be simply supported on all four sides. The incident acoustic pressure is assumed to be a plane wave impinging on the plate at an arbitrary angle. The reradiated pressure is assumed to be negligible compared with the blocked pressure, and the plate vibrations are calculated by a normal-mode approach. A Green's function integral equation is used to link the plate vibrations to be transmitted far-field sound waves, and transmission loss is calculated from the ratio of incident to transmitted acoustic powers. The result is a versatile research and engineering analysis tool that predicts noise transmission loss and enables the determination of the modal behavior of the plate.
    Keywords: ACOUSTICS
    Type: NASA-TP-2398 , L-15861 , NAS 1.60:2398 , Meeting of the Acoustical Society of America; May 07, 1984 - May 10, 1984; Norfolk, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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