22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-3.9.1 (IL)
NASA SUBSONIC JET TRANSPORT NOISE REDUCTION RESEARCH
C. A. Powell, J. S. Preisser
NASA Langley Research Center, USA
Keywords: aircraft noise, jet engine, transport aircraft, environment
Although new jet transport airplanes in today’s
fleet are considerably quieter than the first jet
transports introduced about 40 years ago,
airport community noise continues to be an
important environmental issue. NASA’s
Advanced Subsonic Transport (AST) Noise
Reduction program was begun in 1994 as a
seven-year effort to develop technology to
reduce jet transport noise 10 dB relative to
1992 technology. This program provides for
reductions in engine source noise,
improvements in nacelle acoustic treatments,
reductions in the noise generated by the
airframe, and improvements in the way
airplanes are operated in the airport environs.
These noise reduction efforts will terminate at
the end of 2001 and it appears that the objective
will be met. However, because of an
anticipated 3–8% growth in passenger and
cargo operations well into the 21st Century and
the slow introduction of new the noise reduction
technology into the fleet, world aircraft noise
impact will remain essentially constant until
about 2020 to 2030 and thereafter begin to rise.
Therefore NASA has begun planning with the
Federal Aviation Administration, industry,
universities and environmental interest groups
in the USA for a new noise reduction initiative
to provide technology for significant further
reductions.
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