### ASA 125th Meeting Ottawa 1993 May

## 4pSA6. Sound pressure field into reverberant chamber containing structures
excited acoustically.

**Hugues Nelisse
**

**
Alain Berry
**

**
F. Charron
**

**
Jean Nicolas
**

**
**
*G.A.U.S., Mech. Eng. Dept., Univ. de Sherbrooke, Sherbrooke, PQ J1K 2R1,
Canada
*

*
*
A method has been developed to obtain the sound pressure field for all
points in a large reverberant chamber whether or not it contains a flexible
structure excited acoustically by a so-called diffuse field. The approach is
based on an integral equation method for the pressure in the chamber. The
Helmholtz--Kirchhoff theorem is expressed using a pressure jump function across
the surface of the structure [see, for instance, D. Ouellet et al., J. Acoust.
Soc. Am. 89, 2131--2139 (1991)]. A modal expansion over modes of rigid cavity
and in-vacuo modes of the structure is used. It leads to a set of linear
coupled equations reflecting the existence of a fluid--structure interaction.
Numerical resolution of the set of equations allows one to obtain physical
quantities of interest, such as the distribution of pressure on each side of
the panel and consequently the jump of sound pressure across the structure.
Convergence of the solution, as well as its frequency range of validity, will
be discussed.