North Carolina State University and MIT researchers, whose work was detailed last week in Applied Physics Letters , figured out that by putting a rubber membrane measuring 0.25 mm thick (about 0.01 inches) on the honeycomb, they could bounce up to 1,000 times more sound waves away from the cabin than is currently possible. The membrane is particularly effective at eliminating low-frequency noises, like those that come from the plane’s massive engines.
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