Accession Number : AD0750754

Title :   Acoustic Scattering by Objects Whose Shapes Permit Separation of Variables.

Descriptive Note : Technical memo.,

Corporate Author : SACLANT ASW RESEARCH CENTRE LA SPEZIA (ITALY)

Personal Author(s) : Lauvestad,Vetle R.

Report Date : 01 SEP 1972

Pagination or Media Count : 33

Abstract : Descriptions of the field scattered by finite objects in the presence of a radiating acoustic source are among the investigations fundamental to antisubmarine warfare, but progress from idealised tractable models to more realistic 'target' shapes is a slow business of great theoretical difficulty, leaving aside the complications introduced by the properties of the medium. In this paper a selective review of existing treatments is first briefly and critically made. Then, because of the insight that generalisations may give, a general treatment is formulated of the acoustic scattering problem that includes the whole class of cases in which the Helmoltz's equation separates and partial wave analysis is applicable. Care is taken to indicate the practical shortcomings of the class of solutions that this exact treatment provides. Possible means by which some of these shortcomings might be overcome are indicated. (Author)

Descriptors :   (*SOUND TRANSMISSION, SCATTERING), (*SONAR SIGNALS, SPECTRUM SIGNATURES), ANTISUBMARINE WARFARE, TARGET RECOGNITION, SPHERES, MATHEMATICAL MODELS, ITALY

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE