Subjective Response to Synthesized Flight Noise Signatures of Several Types of V/STOL AircraftNational Aeronautics and Space Administration, 1968 - Short take-off and landing aircraft - 92 pages |
Contents
SUBJECTIVE TESTING | 16 |
Some Aircraft Operational Considerations | 23 |
Other Noise Rating Methods | 31 |
2 other sections not shown
Common terms and phrases
aircraft noise aircraft sounds amplitude amplitude-time history broad-band BY-PASS EXHAUST Comparative Peak Perceived COMPARATIVE PEAK PNdb Configuration cruise noise cruise operation CYCLES PER SECOND decibels Doppler shift electronically exhaust noise fan lift feet flight FREQUENCY IN CYCLES Helicopter Rotor inlet noise jet lift VTOL JET REFERENCE LEVEL IN BAND LIFT ENGINE Lift Fan LIFT JET LIFT TILT WING main rotor MEASURED PNdb LEVELS MICROBAR Noise Reduction Required noise signature peak perceived noise perceived noise level potentiometer predicted pure tone rating method RIGID ROTOR TANDEM rigid rotor VTOL rotational noise rotor noise ROTOR TANDEM ROTOR ROTOR TERMINAL simulated SOUND PRESSURE LEVEL spectrum shape SUBJECTIVE RESPONSE SUBJECTIVE TEST RESULTS SUBJECTS TAKING TEST synthesized tail rotor takeoff TANDEM ROTOR CRUISE Tandem Rotor VTOL terminal noise terminal operation Terminal Spectrum test subjects TEST WHO THINK THINK S WORSE tilt wing VTOL tip speed Turbofan STOL Turboshaft V/STOL aircraft vortex noise