LOW-FREQUENCY SOUND TRANSMISSION IN DUCTS WITH PERMEABLE WALLS

✍ Scribed by A CUMMINGS; R KIRBY

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 225 KB
• Volume: 226
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1999.2298

✦ Synopsis

A predictive model for sound propagation in tubes with permeable walls is presented. In this, acoustic coupling between the internal and external sound "elds is taken into account by the use of an iterative procedure that involves "nite-length &&cells'' of uniform properties in the tube and an appropriate external radiation model. The propagation model is veri"ed by comparison to experimental data on a perforated metal tube and is applied to a practical type of permeable fabric tube. Good agreement between prediction and experiment is noted in the former case with predicted wall impedance values, and in the second case with &&best "t'' empirically derived wall impedance "gures.