Far-Field Pressures from Doubly Periodic Three-Dimensional Elastic Panels
Abstract
We present an analysis and algorithm to calculate the scattered and transmitted far-field pressures for fluid-loaded doubly periodic elastic panels forced by a planar acoustic wave at an arbitrary angle of incidence. The elastic panels are of infinite extent and can have complex internal structures. The fluid-loaded structural response of a single unit cell is determined using the STARS3D finite element solver with periodic boundary conditions and the use of perfectly matched layers (PML) for the truncation of the semi-infinite fluid domains. The far-field pressure is a posteriori calculated by projecting the transverse motion of the wet surface of the unit cell with a simple Fourier analysis. As a result of the infinite periodicity of the configuration, the far-field pressures are represented as a summation of the finite set of radiating modes. Radiation fields for single and multilayered elastic layers with and without internal structures are shown to agree with analytical and numerical solutions.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 03, 2021
- Accession Number
- AD1131737
Entities
People
- David Raudales
- Mauricio Villa
- Saikat Dey
- Zachary Waters
Organizations
- United States Naval Research Laboratory