Abstract
Interference effects from ground reflections are different for moving than for stationary noise sources. These differences have not generally been taken into account in analysis of noise measurements of moving sources such as aircraft. Sound source motion affects measured sound pressure levels for two reasons. First of all, since sound travels with a finite speed, retarded time effects must be taken into account for both “real” sources and “image” sources. Secondly, since the pressure signal received at a microphone must be time‐averaged to obtain sound pressure levels, the distance a source moves during the averaging time must be taken into account. Results of analyses considering those two effects are presented and compared with measurements. [Work supported by NASA Langley Research Center.]
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