A review of air transport noiseFlight vehicles are characterized according to their manner of operation and type of propulsion system, and their associated sources of noise are identified. Available noise reduction technology as it relates to engine cycle design and to power plant component design is summarized. Such components as exhaust jets, fans, propellers, rotors, airflow-surface interactions, and reciprocating engine exhausts are discussed, along with their noise reduction potentials. Significant aircraft noise reductions are noted to have been accomplished by the application of available technology in support of noise certification rules. Improved analytical prediction methods, and well controlled validation experiments supported by advanced design aeroacoustic facilities, are required as a basis for an effective integrated systems approach to aircraft noise control.
Document ID
19740057337
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Hubbard, H. H.
Maglieri, D. J. (NASA Langley Research Center Acoustics and Noise Reduction Div., Hampton, Va., United States)