FLUID–STRUCTURE COUPLING FOR AN UNBAFFLED ELASTIC PANEL IMMERSED IN A DIFFUSE FIELD

✍ Scribed by H. Nelisse; O. Beslin; J. Nicolas

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 359 KB
• Volume: 198
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1996.0583

✦ Synopsis

The study of the structural response of a panel excited by a multiple plane-wave acoustic field is presented. A new semi-analytical approach based on the integral equation method is proposed. The two major difficulties lie in the fact that the panel is unbaffled and is excited by an acoustic field, a system for which the fluid-structure coupling cannot be neglected a priori. Using the free-space Green function and a variational approach, a linear system is obtained for the two unknowns of the problem, the sound pressure jump and the panel deflection. The formulation allows one to obtain a simple physical interpretation in terms of the diffraction and radiation phenomenon. An efficient computation scheme is introduced for the admittance matrix as well as a multiexcitation procedure for the acoustic plane-waves. Convergence of the method is discussed and a comparison with a modal-cavity approach is presented. Finally, the importance of the diffraction by the panel is discussed with regards to approximations usually performed in some numerical techniques.