Method for Reducing Broadband Noise

Researchers at NASA’s Glenn and Langley Research Centers have developed a groundbreaking bio-mimicking acoustic liner for quieting noisy environments. Conventional approaches have not been able to absorb sound effectively in the 400-3,000 Hz range, thereby subjecting humans to excessive noise pollution at the low end of the auditory range. The NASA innovation relies on parallel-stacked tube filters, which improve noise reduction in this range by as much as 25% over conventional melamine or honeycomb solutions.