Noise-absorption structures and walls constituted thereby
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United States of America Patent
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Dec 18, 2001
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N/A
app pub date -
Jan 7, 1998
filing date -
Jun 28, 1996
priority date (Note) -
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Abstract
A noise-absorption structure comprising a frame over which a gastight membrane is tensioned, the outside face of the membrane receiving soundwaves, a gas such as air filling the volume defined by the frame and the membrane, and energy-dissipation means housed in the volume, which means are of the laminar gas-flow type, of the electrostatic type, or of the electromagnetic type, and area adjustable or controllable to modify the acoustic impedance of the structure as a function of the characteristics of the noise to be absorbed. The invention is particularly applicable in the aviation industry.
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