Acoustic Transparency of Non-homogeneous Plates (with repeating inclusions) using Periodic Structures Methodology
Abstract
The paper addresses a class of problems for determining the acoustic interaction of time harmonic plane waves impinging upon submerged elastic plates (fluid backed or void backed), that are of infinite in extent. The plates can have repeated equally spaced inclusions (voids solids, ribs etc.), and also can be constructed from orthotropic and/or isotropic layers that can have a frequency dependent loss factor for the modulus data (e.g. E= E'(1+ietaE), and nu=nu'(1+ieta(nu)), where eta(E) and eta(nu) are the corresponding loss factors for Young's modulus and Poisson's ratio for example. Since the plates are infinite in extent, the issue of dealing with the infinite domain of fluid must be dealt with and is treated through the application of PML (Perfectly Matched Layers) boundary conditions, for absorbing the reflected acoustic waves and transmitted acoustic waves when the plates are fluid backed. The physical quantities of interest are typically the reflected acoustic waves and transmitted acoustic waves, however detailed information of how the elastic stress waves propagate through and around the inclusions are often of interest as well.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2007
- Accession Number
- ADA592630
Entities
People
- Anthony J. Kalinowski
Organizations
- Naval Undersea Warfare Center