Aerospace America/June 2006, p38~42: Hushing the roar of air traffic growth
*Unless something is done to
reduce aircraft noise significantly,
the growth of air traffic in the U.S.
will be hindered by a lack of new
airports and limited runway capacity. Of all
aviation-related environmental issues, noise
is the number-one concern of the communities
surrounding airports, both existing and
proposed. This is making the construction
of new facilities and the expanded use of
existing runways an increasingly political issue.
*Today, along with fuel
efficiency and safety, noise reduction is one of the key elements
of aircraft and engine design.
*"Noise is still number one," says Carl Burleson, director of
the office of environment and energy at the Federal Aviation
*...the biggest obstacles to building new
airports and expanding runway capacity are environmental
concerns—with noise at the forefront.
*Runway capacity, according to a number of studies, is a
primary issue facing the air traffic system, which the federal
government predicts will have to handle a threefold increase in
passenger growth by 2025.
*high-bypass turbofans,...,"was one of the best things that ever
happened for aircraft noise, and it was not ac-tually
designed for [noise reduction]," says Char-lotte
Whitfield, an aeroacoustics specialist at
NASA. “It’s about the only time that perfor-mance
benefit and noise benefit have gone
hand in hand.”
*... aircraft and engine
makers as well as people in academia and gov-ernment
are constantly working on ways to
make airplanes even quieter. Their efforts cover
a range of initiatives focusing on engines, air-frames,
and procedures. NASA is heavily in-volved.
Its Quiet Aircraft Technology program,
which provides research and funding, aims to
reduce perceived aircraft noise by 50% within
10 years and by 75% within 25 years, relative
to 1997 levels.
*Acoustic treatment to engine inlet; Chevron nozzles added to engine exhaust;
Landing gear ; adjusting arrival procedures;...