V/STOL Aircraft Noise Prediction (Jet Propulsors)
Final rept. Jun 1974-Jun 1975
LOCKHEED-GEORGIA CO MARIETTA
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A computer program is presented for predicting the noise levels of V STOL aircraft with jet-propulsive-lift systems. Using the equations developed in Part I of this report the noise levels may also be estimated with hand calculations. Vectored thrust, externally blown flap, upper surface blown flap, internally blown flap, and augmentor wing are the propulsive-lift concepts considered. Semi-empirical equations are derived using the test results and theories for the following aircraft noise sources Internal engine, jet, excess core engine, high-lift system, airframe, and auxiliary power unit. The computer program predicts the perceived noise levels and tone corrected perceived noise levels for VSTOL aircraft at any specified sideline distance for known geometrical and operational parameters. This report supersedes the earlier report No. FAA-RD-73-145, August 1973.