Seasonal Sonic Boom Propagation Prediction

Seasonal variations in wind and temperature gradients are known to influence the propagation of sonic booms. This report examines predictive techniques in current use which may be refined for application to seasonal Environmental Impact Statements. The effects of seasonally averaged refractive atmos...

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Bibliographic Details
Main Author: Lundberg, W. R
Format: Report
Language:English
Subjects:
ACOUSTIC REFRACTION
ACOUSTIC WAVES
Acoustics
AIRCRAFT NOISE
ALTITUDE
ATMOSPHERIC REFRACTION
COMPARISON
ENVIRONMENTAL IMPACT STATEMENTS
EXPERIMENTAL DATA
EXPOSURE(PHYSIOLOGY)
MATHEMATICAL MODELS
MATHEMATICAL PREDICTION
NOISE POLLUTION
Noise Pollution and Control
PE62202F
SEASONAL VARIATIONS
SONIC BOOM
SOUND RANGING
SUPERSONIC FLIGHT
TEMPERATURE GRADIENTS
WAVE PROPAGATION
WIND VELOCITY
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Summary:Seasonal variations in wind and temperature gradients are known to influence the propagation of sonic booms. This report examines predictive techniques in current use which may be refined for application to seasonal Environmental Impact Statements. The effects of seasonally averaged refractive atmospheres on the sonic boom carpet predictions for an example flight of an F-111 at Mach 1.3 and 10,000 feet above Mean Sea Level (MSL) were documented. The effect of such atmospheres on predicted noise exposures due to a real-world mix of supersonic flights was estimated. The example boom environment was chosen to be that near Edwards Air Force Base (EAFB) where sonic booms are known to affect the public. Two distinct atmospheric averaging techniques were applied seasonally and the resulting sonic boom predictions compared to each other and to those predictions obtained using the U.S. Standard Day Atmosphere and the Annual reference Atmosphere for Edwards AFB. The results show the potential benefit of conducting seasonal sonic boom predictions in forecasting the effects which supersonic flight operations have on the public. (AN)