Accession Number:

ADA000098

Title:

A Finite Element Approach to Scattering from Elastic Spherical Shells.

Descriptive Note:

Research rept. Oct 73-Mar 74,

Corporate Author:

NAVAL UNDERSEA CENTER SAN DIEGO CALIF

Personal Author(s):

• Nichols,Charles S.
• Knittel,Max R.
• Barach,Don
• Carlson,Marianne

Report Date:

1974-09-01

Pagination or Media Count:

41.0

Abstract:

An approximation method is presented for solving the equations of motion that describe the scattering of a plane incident acoustic wave by an elastic spherical shell immersed in an infinite acoustic fluid medium. The mathematical model that is described uses the finite-element method to calculate the vibrational characteristics of the elastic spherical shell and the acoustic pressure field of a finite volume of the fluid which surrounds the spherical shell. Analytical methods are used to obtain the boundary conditions that are applied to the surface of the finite fluid volume. This technique is used to predict the total scattering cross-section, front and back axial pressures and near field pressure distribution for both evacuated and fluid-filled elastic spherical shells. Modified author abstract

Descriptors:

• *ACOUSTIC SCATTERING
• *UNDERWATER SOUND
• *UNDERWATER STRUCTURES
• MATHEMATICAL MODELS
• MATRICES(MATHEMATICS)
• ELASTIC PROPERTIES
• SPHERES
• ALUMINUM

Subject Categories:

• Acoustic Detection and Detectors
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE