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acoustical data aircraft design annoyance ratings annoying APPENDIX Beranek and Newman Boeing Company COMPONENT NOISE REDUCTION configurations Correlation of Subjective DATA ON SUBJECTIVE dB-A dB-C dBA Level DECIBELS Design Parameters Trade-Off distance doubling of duration Duration 15 Sec Duration Trade-off evaluations exposure FREQUENCY Helicopter and Tilt HELICOPTER SOUNDS indicates Jerry Davis jet reference sound judged significantly lasting 15 seconds leisure activities Leisure S.D. lower when lasting ment method of successive NASA octave band overlap Paired Comparison Perceived Noise Level PNdB Levels PNdB per doubling Psychological Scaling Ratings with Helicopter Ratings With Tilt reference jet sound REQUIRED COMPONENT NOISE ROTATIONAL NOISE scale values seconds in duration significantly more acceptable sound duration standard deviation standard errors STANDARD SCORE stimulus subjective acceptability subjective response subjectively rated annoyance successive categories TABLE tandem rotor TAPE test subjects TILT WING SOUNDS TILTWING tip speed trailer V/STOL VARIANCE ACCOUNT Variation VTOL aircraft sounds