ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

1pPA3. The prediction of sonic-boom distortion using a scattering center based calculation.

Richard Raspet

Henry E. Bass

Dept. of Phys. and Astron., Natl. Ctr. for Phys. Acoust., Univ. of Mississippi, University, MS 38677

A numerical scattering technique has been developed to calculate the effect of turbulence on sound propagation. This technique resolves the atmosphere into discrete ``turbules,'' calculates the scattered field from each turbule using the Born approximation, then sums all the contributions to form the scattered waveform. The effect of single ``turbules'' of different scales will be discussed. This technique has been applied to model the atmosphere and the propagation of sonic booms through the planetary boundary layer during the JAPE-2 tests at White Sands. Good agreement was achieved. The limitations and planned improvements will be described. [Work supported by NASA Langley Research Center.]