Interactions of a Target with its Acoustic Environment.
Abstract
The results of a project to develop the capability to numerically model the sound scattered from a target in a dispersive environment are reported. The target has been rigorously coupled to its environment by combining a finite element formulation of the target shell dynamics with a Helmholtz Integral Equation formulation of fluid loading and a normal mode formulation of sound propagation. Though the computational cost of obtaining numerical solutions to this problem are awesome, some simple approximations can result in significant savings. In particular, neglect of Fresnel diffraction and boundary-induced multiple scattering permits a particularly simple and tractable reformulation of the problem. The reported work makes the following contribution to solving the problem of target-environment interactions: the errors caused by neglecting Fresnel diffraction terms and multiple scattering are numerically evaluated. (AN)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1994
- Accession Number
- ADA294441
Entities
People
- D. Barach
- D. Gillette
- E. P. Mcdaid
Organizations
- Naval Command, Control and Ocean Surveillance Center