Coupled FE and HIE method for exterior acoustics of axisymmetric shells
Abstract
A receptance method for calculating the exterior acoustics of axisymmetric shells is presented. A conical shell finite element is used to model the shell and the exterior Helmholtz integral equation the fluid; the displacements and pressure being represented by Fourier series expansions in the circumferential coordinate. The dynamic stiffness matrix of the system is obtained by combining the separate dynamic stiffness matrices of the fluid and structure, using normal coordinates alone to save computer time. The excitation is either a timeharmonic point force or a plane wave incident at an oblique angle. In order to validate the problem formulation and computer programs, numerical results of far field sound radiation from a spherical elastic shell are compared with those from a closedform shell theory.
 Publication:

Unknown
 Pub Date:
 July 1987
 Bibcode:
 1987cfhm.rept.....J
 Keywords:

 Acoustic Excitation;
 Axisymmetric Bodies;
 Conical Shells;
 Finite Element Method;
 Fluid Filled Shells;
 Helmholtz Vorticity Equation;
 Fourier Series;
 Series Expansion;
 Shell Theory;
 Sound Waves;
 Stiffness Matrix;
 Acoustics