In 1968 Sawyers presented a theory which predicts the acoustic pressure underwater due to a supersonic aircrafts sonic boom in the air. The theory has since been validated in laboratory experiments. In the present paper Sawyers theory is utilized to predict the effect of a supersonic aircrafts speed on the penetration of the sonic boom into the water. By taking into account the variation in a sonic booms duration as a function of the aircraft Mach number, it is shown that higher aircraft speeds are associated with higher acoustic pressures in the water. For fixed depths of 10 m or less the Sound Pressure Level varias less thean 6 dB over a wide range of Mach numbers. For greater depths, 100 m for example, increased Mach numbers may increase the Sound Pressure Level by 15 dB or more. The acual levels are always diminished for deeper depths. These observations may be importatnt for avaluating the possible effects of sonic boom noise on marine mammals.
The effect of supersonic aircraft speed on the penetration of sonic boom noise into the ocean
Der Einfluss der Überschall-Flugzeuggeschwindigkeit auf das Eindringen des Überschallknalls in den Ozean
Journal of the Acoustical Society of America ; 97 , 1 ; 159-162
1995
4 Seiten, 4 Bilder, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
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