American Machinist

Boeing Staging Tests on Fuel Efficiency, Engine Noise

A new engine inlet design and modified take-off and landing procedures will be studied to improve future aircraft performance ...

How the Boeing 737 MAX, 747-8, & 787 Dreamliner's engines create problems no other modern jet faces

Designed to reduce noise, nacelle chevrons ultimately proved to be more bad than good.

Boeing, Lufthansa, Rolls-Royce to test fuel-saving, noise-reduction tech on 787

Boeing, Lufthansa and Rolls-Royce flight-test 787-9 tech to cut fuel burn and airport noise, supporting greener aircraft.
eng.belta

Russian scientists find way to make aircraft engines quieter

MOSCOW, 20 March (BelTA - TV BRICS) - Researchers at Perm National Research Polytechnic University have developed an innovative sound-absorbing structure that effectively reduces aircraft engine noise ...

I'm a frequent flier, and these are the only headphones that drown out the plane's engine noise

The first time I flew with them, I understood the hype.
Airways

Boeing, Lufthansa, Rolls-Royce to Test 787 Fuel, Noise Technologies

The partners will use a Lufthansa-bound Boeing 787-9 to test a new engine inlet and noise-reducing flight procedures.