Noise Abatement Technology Options for Conventional Turboprop Airplanes.
BOLT BERANEK AND NEWMAN INC CANOGA PARK CA
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The practical application of noise control technology to new and derivative conventional turboprop airplanes likely to come into service in the 1980s has been analyzed with a view to determining noise control costbenefits. The analysis identifies feasible noise control methods, applies them to four study airplanes, and presents the noise reductions in terms of the equivalent perceived noise level at takeoff, sideline and approach locations, and the effect on the area within selected EPNL contours. Noise reductions of up to 8.3 dB for takeoff and 10.7 dB for approach are calculated for the study airplanes but, for most cases, the changes are less than 5 dB. Weight and cost increases associated with the noise control treatments are determined under the assumption that they are no changes to airplane performance or fuel consumption. Author