Measurements and analysis of farfield scattering from a prolate spheroid
Abstract
The farfield acoustic scattering by a prolate spheroid with axial point sources near the tip of the body was measured. Data were taken for ka between 10 and 160, where a is the semimajor axis of the spheroid. Comparisons were made with numerical results obtained by an integral equation based on the simplesource method, with appropriate coordinate stretching introduced to permit highfrequency solutions with a minimal number of grid points. Theory and experiment agree within experimental error except for the highest frequencies in the shadow region, where very rapid changes in pressure make precise measurements difficult. The results show that for frequencies of aeroacoustic interest, the scattered field is very large and cannot be ignored.
 Publication:

Acoustical Society of America Journal
 Pub Date:
 September 1978
 DOI:
 10.1121/1.382049
 Bibcode:
 1978ASAJ...64..896B
 Keywords:

 Acoustic Measurement;
 Acoustic Scattering;
 Far Fields;
 Field Theory (Physics);
 Prolate Spheroids;
 Sound Fields;
 Asymptotic Methods;
 Error Analysis;
 Mathematical Models;
 Sound Pressure;
 Wave Diffraction;
 Acoustics