Technology

June 13, 2018
 

Evaluating noise of future aircraft

Alcyon Technical Services photograph by Rami Daud

As air traffic continues to surge in the U.S., neighbors who live near airports are complaining about the escalating noise. All the while, the demand for faster aircraft that travel at supersonic speeds is accelerating.

To address the expected noise levels of future aircraft, NASA’s Commercial Supersonic Technology project is already developing technologies focused on reducing the noise produced by an aircraft’s engine exhaust.

Acoustics experts at NASA’s Glenn Research Center in Cleveland, Ohio, recently used the center’s Aero-Acoustic Propulsion Laboratory to complete an evaluation on a small-scale model of a Learjet engine exhaust, or nozzle, system.

The blue, curved array at the top of the AAPL dome held microphones for making the noise measurements and simulating a flyover.  The large door to the right was opened to exhaust the air from the jet during tests.

“This recent test succeeded in creating a simulated environment which closely matched flight tests, and the results provide us with a unique opportunity to investigate how well noise levels produced in the lab can be compared with flight test noise data,” says Research Engineer Dennis Huff.




All of this week's top headlines to your email every Friday.


 
 

 

Headlines – November 19, 2018

News Here’s what Pentagon’s first-ever audit found – The Pentagon’s first-ever audit discovered major flaws in how it handles IT processes and challenges with its internal tracking databases, but did not discover any major cases of fraud or abuse.     Business Australia makes its pick for drone fleet – Australian Defence Minister Christopher Pyne...
 
 

News Briefs – November 19, 2018

U.S. military chief says tech giants should work with Pentagon The top U.S. military officer says it’s problematic that American tech companies don’t want to work with the Pentagon but are willing to engage with the Chinese market. U.S. Chairman of the Joint Chiefs of Staff Joseph Dunford told the Halifax International Security Forum Nov....
 
 
virgin-galactic9

Virgin Orbit completes successful captive-carry flight test with ‘flying launchpad’

VICTORVILLE, Calif.— On Nov. 18, a new sight appeared in the baby-blue skies over Southern California: A specially modified 747-400 carrying a 70-foot-long rocket under its wing soared through the air as part of a successful ...