Accession Number:

AD1004959

Title:

Enhancements of the Elasto-Acoustic Capabilities of AVAST

Descriptive Note:

Technical Report

Corporate Author:

Defence R and D Canada - Atlantic Dartmouth, Nova Scotia Canada

Personal Author(s):

Report Date:

1995-04-01

Pagination or Media Count:

98.0

Abstract:

The development and incorporation of the latest enhancements to the AVAST code are described. The purpose of this work was to make the modelling of the elasto-acoustic interaction more realistic, while ensuring that the code runs as efficiently as possible. To this end, several new features have been added. These include the option to use the wet modes of the structure when generating the mobility matrix, the option to generate a structural impedance matrix based upon the mass, damping and stiffness matrices, the implementation of a multi-frequency boundary integral equation method, decomposition of the current AVAST program modules in order to allow for restart analyses, implementation of a convergence acceleration technique for use in the calculation of the waveguide Greens function, incorporation of the hypersingular Burton and Millar boundary integral equation method and the implementation of a coupling between the fluid and structural models for the transient case.

Subject Categories:

  • Computer Programming and Software
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE