Boundary element model of the acoustic field radiated by a baffled rectangular plate
Abstract
A boundary element model based on Helmholtz's equation and employing the free-space Green's function has been formulated to study the acoustic field of baffled vibrating rectangular plates. The model utilizes isoparametric elements in which the acoustic variables and surface geometry are represented by the same shape functions. The numerical aspects of the boundary element method (BEM) are studied, revealing the sensitivity of the model to mesh refinement and element type (linear or quadratic). The model is shown to accurately predict the radiation impedance of a square baffled piston, and the axial pressure in front of the piston is shown to converge to the known far-field solution. The model is then used to predict the directivity patterns of vibrating rectangular plates.
- Publication:
-
International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration
- Pub Date:
- 1990
- Bibcode:
- 1990rdas.conf..439F
- Keywords:
-
- Boundary Element Method;
- Green'S Functions;
- Rectangular Plates;
- Sound Waves;
- Structural Vibration;
- Far Fields;
- Finite Element Method;
- Acoustics