A U.S. research engineer says he's developed microchanneled material that reduces aircraft engine noise through a process called viscous shear.Noise from commercial and military jet aircraft causes environmental problems for communities near airports, requiring airplanes to follow often complex noise-abatement procedures on takeoffs and landings.But Jason Nadler of the Georgia Tech Research Institute has found a physics approach to resolve the problem. Nadler and colleagues said they have found honeycomb-like structures composed of many tiny tubes or channels can reduce sound more effectively than conventional methods.This approach dissipates acoustic waves by essentially wearing them out, said Nadler. ...
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