NASA’S QUIET AIRCRAFT TECHNOLOGY PROJECT

摘要

NASA's Quiet Aircraft Technology Project isdeveloping physics-based understanding,models and concepts to discover and realizetechnology that will, when implemented, achievethe goals of a reduction of one-half in perceivedcommunity noise (relative to 1997) by 2007 anda further one-half in the far term. Noise sourcesgenerated by both the engine and the airframeare considered, and the effects ofengine/airframe integration are accounted forthrough the propulsion airframe aeroacousticselement. Assessments of the contribution ofindividual source noise reductions to thereduction in community noise are developed toguide the work and the development of newtools for evaluation of unconventional aircraftis underway. Life in the real world is taken intoaccount with the development of more accurateairport noise models and flight guidancemethodology, and in addition, technology isbeing developed that will further reduce interiornoise at current weight levels or enable the useof lighter-weight structures at current noiselevels.