Accession Number : AD0735859

Title :   Scattering of Sound from Layered Hollow Elastic Cylinders.

Descriptive Note : Technical rept.,

Corporate Author : SOUTHERN METHODIST UNIV DALLAS TEX DEPT OF STATISTICS

Personal Author(s) : Tepera,Joseph E.

Report Date : 08 NOV 1971

Pagination or Media Count : 79

Abstract : The scattering of a continuous plane wave by a layered cylinder was investigated through the solution of hyperbolic wave equations and the associated boundary conditions. A basic steel cylinder was assumed to be coated with a single layer of an isotropic linearly elastic material, e.g., copper, nickel, etc., and the resulting far field scattered pressure patterns were computed considering fluid-filled interiors as well as boid interiors. Comparative analyses of the resulting patterns over a wave number range of 0.25 to 5.0 have shown that the mass and elastic moduli of the coating materials are of significant influence, and that there is the presence of an apparent transmission phenomenon. In addition, the thin shell solution to the scattering of a single layer cylinder resulted in magnitude differences in the forward scattered portion for radius-to-thickness (R/t) ratios up to 50 when compared to the 2-dimensional elasticity solution.. (Author)

Descriptors :   (*SOUND TRANSMISSION, MATHEMATICAL MODELS), (*ELASTIC SHELLS, SOUND TRANSMISSION), SCATTERING, PARTIAL DIFFERENTIAL EQUATIONS, BESSEL FUNCTIONS, NUMERICAL ANALYSIS, CYLINDRICAL BODIES, WAVE FUNCTIONS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE