Noise attenuation structures
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United States of America Patent
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Jun 9, 2020
Grant Date -
Jul 11, 2019
app pub date -
Dec 6, 2017
filing date -
Dec 6, 2017
priority date (Note) -
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Abstract
Noise attenuation structures, such as acoustic liners for gas turbine engines, are provided. For example, an acoustic liner comprises a face sheet, a backing sheet spaced apart from the face sheet, and a plurality of cavities defined between the face and backing sheets. The cavities are defined by cavity walls. A plurality of backing sheet walls extends from the backing sheet toward the face sheet. The backing sheet walls extend adjacent the cavity walls, and the backing sheet is movable with respect to the face sheet such that the cavities have a variable depth. Other embodiments of noise attenuation structures also are provided.
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