Title: Coupled structural-acoustic computations for interior problems using a modal solution for the structural vibrations and a direct solution for the acoustic pressure field.
Abstract: Structural-acoustic computations involving enclosed volumes of fluid using finite elements are often performed by coupling in vacuo structural modes with acoustic modes derived assuming rigid-wall boundary conditions, sometimes referred to as Dowell’s method. This approach works well for problems with “light” fluid coupling, but is very slow to converge for problems with “heavy” fluid coupling. Several authors have suggested methods to derive terms to add to the acoustic basis set to account for the residual contributions of truncated modes. Another possibility, which will be the focus of this paper, is to directly compute the acoustic field in terms of nodal pressure variables rather than as a modal summation. Despite the relative simplicity of this approach, it does not appear to have explored previously in the literature. As will be shown, the coupled structural-acoustic equation system closely resembles that for coupled finite element/boundary element problems because both are written in terms of the structural variables only. The main goal of the presentation will be to demonstrate that using a direct solution for the acoustic field alleviates the slow convergence difficulties encountered with Dowell’s method for coupled structural-acoustic analyzes.
Publication Year: 2011
Publication Date: 2011-04-01
Language: en
Type: article
Indexed In: ['crossref']
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