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Noise impact of advanced high lift systemsThe impact of advanced high lift systems on aircraft size, performance, direct operating cost and noise were evaluated for short-to-medium and medium-to-long range aircraft with high bypass ratio and very high bypass ratio engines. The benefit of advanced high lift systems in reducing noise was found to be less than 1 effective-perceived-noise decibel level (EPNdB) when the aircraft were sized to minimize takeoff gross weight. These aircraft did, however, have smaller wings and lower engine thrusts for the same mission than aircraft with conventional high lift systems. When the advanced high lift system was implemented without reducing wing size and simultaneously using lower flap angles that provide higher L/D at approach a cumulative noise reduction of as much as 4 EPNdB was obtained. Comparison of aircraft configurations that have similar approach speeds showed cumulative noise reduction of 2.6 EPNdB that is purely the result of incorporating advanced high lift system in the aircraft design.
Document ID
19950019740
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Elmer, Kevin R.
(McDonnell-Douglas Aerospace Long Beach, CA, United States)
Joshi, Mahendra C.
(McDonnell-Douglas Aerospace Long Beach, CA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1995
Subject Category
Acoustics
Report/Patent Number
NASA-CR-195028
CRAD-9310-TR-0127
NAS 1.26:195028
Accession Number
95N26160
Funding Number(s)
PROJECT: RTOP 538-03-15-01
CONTRACT_GRANT: NAS1-20103
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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