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- W4379877275 abstract "A single degree-of-freedom acoustic liner, consisting of a perforate facesheet over honeycomb core, is modified to have a facesheet comprised of three layers. The top and bottom perforate layers have the same dimensions with aligned perforations while the middle layer perforate can be longitudinally shifted up to 0.075 inches to change the effective porosity of the facesheet. These configurations range in porosity from 100% open down to 10% open in addition to two closed configurations (0% porosity). Gaps are introduced between the facesheet layers ranging from no gap to 0.016 inches. These configurations are tested in the NASA Langley Grazing Flow Impedance Tube to determine their acoustic impedance spectra. Introduction of a gap affects the acoustic impedance of the liner where the resonant frequency of the liners decreases with increased gap thickness for liners with an open area ratio above 25% but increases with gap thickness for liners with an open area ratio below 25%. Additionally, increasing the gap thickness reduces the effect of porosity on acoustic impedance. The results show that the presence of such gaps can have a significant effect on liner impedance especially as porosity decreases." @default.
- W4379877275 created "2023-06-09" @default.
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- W4379877275 date "2023-06-08" @default.
- W4379877275 modified "2023-09-27" @default.
- W4379877275 title "Effects of Layer Spacing for a Multilayered Facesheet Acoustic Liner" @default.
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- W4379877275 doi "https://doi.org/10.2514/6.2023-3640" @default.
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