Monday January 20, 2020
Home Lead Story NASA’s ...

NASA’s Noise-Reduction Tech to Make Quieter Airports a Reality

The Landing Gear Noise Reduction technology element addressed airframe noise caused by airflow moving past the landing gear on approach

0
//
NASA image.
Just 11 years after Eisenhower authorized NASA, American astronaut Neil Armstrong walked on the moon. Pixabay

Aiming to reduce aircraft noise for communities that live near airports, NASA has successfully tested new noise reduction technologies on a series of Acoustic Research Measurement (ARM) flight, and managed to cut airframe noise during landing by more than 70 per cent.

The ARM flights, which concluded in May, at NASA’s Armstrong Flight Research Center in California, tested technology to address airframe noise, or noise that is produced by non-propulsive parts of the aircraft, during landing.

NASA successfully combined several technologies including Landing Gear Noise Reduction, landing gear cavity treatments, and the Adaptive Compliant Trailing Edge flexible wing flap, on various airframe components of a Gulfstream III research aircraft to achieve a greater than 70 per cent reduction in airframe noise.

“This airframe noise reduction produced by NASA technology is definitely momentous, and the best part is that it directly benefits the public,” ARM Project Manager Kevin Weinert, said in a statement.

“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,” added Mehdi Khorrami, an aerospace scientist at NASA’s Langley Research Center in Virginia.

The Gulfstream III research aircraft flew at an altitude of 350 feet, over an 185-sensor microphone array deployed on the Rogers Dry Lake at Edwards Air Force Base in California.

NASA jet
Representational image. (IANS)

The Landing Gear Noise Reduction technology element addressed airframe noise caused by airflow moving past the landing gear on approach.

Another area of focus was landing gear cavities, also a known cause of airframe noise. These are the regions where the landing gear deploys from the main body of an aircraft, typically leaving a large cavity where airflow can get pulled in, creating noise.

NASA applied two concepts to these sections, including a series of chevrons placed near the front of the cavity with a sound-absorbing foam at the trailing wall, as well as a net that stretched across the opening of the main landing gear cavity.

This altered the airflow and reduced the noise resulting from the interactions between the air, the cavity walls, and its edges, the report said.

Also Read: NASA Seeks Partnership With US Industry to Develop First Gateway Element

To reduce wing flap noise, NASA used an experimental, flexible flap, which investigated the potential for flexible, seamless flaps to increase aerodynamic efficiency.

“While there are obvious potential economic gains for the industry, this benefits the people who live near major airports, and have to deal with the noise of aircraft coming in to land. This could greatly reduce the noise impact on these communities,” Weinert said. (IANS)

Next Story

Space Rock Twice the Size of Big Ben to Skim Past Earth: NASA

"These asteroids have been well observed and their orbits are very well known," said NASA's Planetary Defence Officer Lindley Johnson

0
University of Iowa, Radiation, Sun
FILE - Tourists take pictures of a NASA sign at the Kennedy Space Center visitors complex in Cape Canaveral, Florida, April 14, 2010. VOA

NASA is closely monitoring an asteroid with an estimated diameter of about 755 feet — larger than the Golden Gate Bridge tower or more than twice the height of London’s Big Ben — that is currently heading towards Earth and is expected to skim past the planet on Monday.

Flying towards the planet at a speed of over 61,500 miles per hour, the Near-Earth Object (NEO) is big enough to destroy an entire city if collides with the Earth.

The approaching asteroid has been identified as “2020 AQ1”.

According to Express.co.uk, the asteroid will make its closest Earth approach on January 20 at around 2.54 am EST (1.24 pm India time).

The European Space Agency (ESA) has identified 21,655 NEO asteroids and 109 NEO comets.

NASA
Earth’s view from moon’s surface. Pixabay

The asteroid will hurtle past the planet on what astronomers have described as a “close approach” trajectory.

NASA’s trackers estimate the rock measures somewhere in the range of 328 feet -754 feet across – more than twice the height of London’s Big Ben.

Last September, a pair of asteroids flew past the Earth.

Also Read: Malaysia on Track to Roll out 5G Service Commercially: President Mahathir Mohamad

“These asteroids have been well observed and their orbits are very well known,” said NASA’s Planetary Defence Officer Lindley Johnson.

“Both of these asteroids are passing at about 14 lunar distances from the Earth, or about 3.5 million miles away, but small asteroids pass by Earth this close all the time,” he added. (IANS)