COUPLING INTEGRAL AND GEOMETRICAL REPRESENTATIONS FOR VIBRO-ACOUSTICAL PROBLEMS

✍ Scribed by P. JEAN

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 198 KB
• Volume: 224
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1999.2195

✦ Synopsis

The "nite-element method is limited either to small geometries or to the low-frequency range, whereas geometrical approaches are best applied at medium and high frequencies, but do not take vibrating surfaces into account. When the vibrating boundaries of a volume are only a small part of the total boundary it is worth combining the two methods. By using geometrical methods to compute a Green function that includes all wave re#ections on the surfaces of the volume, it is possible to restrict the integral representation of the pressure "eld to the vibrating surfaces. The surfaces to be meshed will be reduced to surfaces with known velocity "elds. This approach o!ers a means of reducing computation times. It has been applied to large volumes corresponding to a room with a vibrating concrete wall and to a train with a vibrating window.