Title: Imaging the sources on a cylindrical shell from far-field pressure measured on a semicircle
Abstract: This paper provides a method to identify which areas on a vibrating cylindrical shell body radiate to the far field. Of particular interest is the identification of these surface ‘‘hot spots’’ (as a function of frequency) from pressure measurements made in the far field on a circle with the source at the center, located in the same plane as the axis of the shell. In this paper a simple formula is derived using a rigorous mathematical approach for the backpropagation of this far-field data to the surface of the shell. The accuracy of this approach is tested with numerical and experimental data. It is shown over a wide frequency range that far-field data can accurately predict the acoustic source regions on the shell in the same plane as the measured data. These regions are quantified using a new concept, supersonic acoustic intensity. Implied in the success of this approach is a general rule that acoustic sources on a cylindrical body which radiate to the far field, radiate dominantly in the direction defined by the plane passing through the shell axis and the source.
Publication Year: 1996
Publication Date: 1996-04-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 13
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