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Accession Number N20120014562
Title Vibroacoustic Characterization of a New Hybrid Wing-Body Fuselage Concept.
Publication Date Aug 2012
Media Count 12p
Personal Author A. Przekop A. R. Allen
Abstract A lighter, more robust airframe design is required to withstand the loading inherent to next generation non cylindrical commercial airliners. The Pultruded Rod Stitched Efficient Unitized Structure concept, a highly integrated composite design involving a stitched and co-cured substructure, has been developed to meet such requirements. While this structure has been shown to meet the demanding out-of-plane loading requirements of the flat-sided pressurized cabin design, there are concerns that the stiff co-cured details will result in relatively high acoustic radiation efficiencies at frequencies well below the thin skin acoustic coincidence frequency. To address this concern and establish a set of baseline vibroacoustic characteristics, a representative test panel was fabricated and a suite of tests were conducted that involved measurements of panel vibration and radiated sound power during point force and diffuse acoustic field excitations. Experimental results are shown and compared with Finite Element and Statistical Energy Analysis model predictions through the use of modal and energy correlation techniques among others. The behavior of the structure subject to turbulent boundary layer excitation is also numerically examined.
Keywords Aeroacoustics
Body-wing configurations
Computational fluid dynamics
Finite element method
Flight conditions
Frequency distribution
Hybrid structures
Mathematical models
Sensitivity analysis
Structural vibration

Source Agency National Aeronautics and Space Administration
NTIS Subject Category 46A - Acoustics
72B - Algebra, Analysis, Geometry, & Mathematical Logic
51C - Aircraft
Corporate Author National Aeronautics and Space Administration, Hampton, VA. Langley Research Center.
Document Type Journal article
Title Note N/A
NTIS Issue Number 1308
Contract Number N/A

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