NASA: Tests Show ‘Significant’ Aircraft Noise Reduction

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A series of flight tests has successfully demonstrated a “significant reduction” in the noise generated by aircraft operating near airports, NASA said in a news release on Monday. The test flights, which concluded in May, took place from NASA’s Armstrong Flight Research Center in California. NASA’s Gulfstream III research aircraft flew at 350 feet, above a 185-sensor microphone array deployed on the Rogers Dry Lake at Edwards Air Force Base in California. The flights combined several technologies that achieved a 70 percent reduction in airframe noise during landing, NASA said. Airframe noise is generated by the aircraft’s movement through the air, and doesn’t include noise generated by the engines.

The jet was equipped with porous landing-gear fairings, and a series of chevrons was installed near the leading edge of the landing-gear cavity, with a net stretched across the opening to alter airflow and align it more with the wing. The researchers also had installed an Adaptive Compliant Trailing Edge wing flap, which had previously been flight-tested. “The number one public complaint the FAA receives is about aircraft noise,” said Mehdi Khorrami, NASA’s principal investigator for the project. “NASA’s goal here was to reduce aircraft noise substantially in order to improve the quality of life for communities near airports. We are very confident that with the tested technologies we can substantially reduce total aircraft noise, and that could really make a lot of flights much quieter.”

AVweb's Paul Bertorelli spoke with Khorrami about the project recently; here's his video report.

view on YouTube

Comments (7)

"The flights combined several technologies that achieved a 70 percent reduction in airframe noise during landing,"

Airframes during LANDING?
The noise complaints are all about ENGINES, not airframes during landing.

Posted by: Mark Fraser | June 26, 2018 5:46 PM    Report this comment

Wrong, Mark. See the attached video that explains the research.

Posted by: Paul Bertorelli | June 27, 2018 7:25 AM    Report this comment

YOU need to watch (and hear) the video.
You hear engine noise primarily and you see the gear raise BEFORE LEAVING the airport environment. Airlines are also so cheap these days that gear is not even extended until the last moment before a landing. Airlines are just not flying around anymore with the gear hanging out for extended periods of time.

As far as complainants about noise, the ear perceives higher pitch noises as more offensive and louder. The higher pitch noises are from the engines, not from the lower and more muffled sounds from air passing around the flaps or wheels.

Posted by: Mark Fraser | June 27, 2018 7:46 AM    Report this comment

NIMBY's will complain about any kind of airplane noise, no matter what it is!

Posted by: matthew wagner | June 27, 2018 11:56 AM    Report this comment

NIMBYs even blame airplanes for noise caused by Harley Hogs, leaf blowers, and street racers. I remember going to an airport noise hearing and one of the loud mouths had a beautiful Harley with straight pipes. Go figure

Posted by: Leo LeBoeuf | June 27, 2018 7:08 PM    Report this comment

Leo nailed it.
We've had McMansions recently surround our local airport over the last 10 years.
Guess what the airport now has? Noise complaints!
No matter what's done, the new residents report "noise" at the airport.

No matter what's done by new super computers or NASA, new residents will still report "noise" at airports.

Posted by: Mark Fraser | June 28, 2018 1:33 PM    Report this comment

NIMBYs have evolved into BANANAs - Build Absolutely Nothing Anywhere Near Anything!

Posted by: Kirk Wennerstrom | June 30, 2018 2:37 PM    Report this comment

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