LOW-FREQUENCY SOUND TRANSMISSION IN DUCTS WITH PERMEABLE WALLS
1999; Elsevier BV; Volume: 226; Issue: 2 Linguagem: Inglês
10.1006/jsvi.1999.2298
ISSN1095-8568
Autores Tópico(s)Wind and Air Flow Studies
ResumoA predictive model for sound propagation in tubes with permeable walls is presented. In this, acoustic coupling between the internal and external sound fields is taken into account by the use of an iterative procedure that involves finite-length “cells” of uniform properties in the tube and an appropriate external radiation model. The propagation model is verified 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 fit” empirically derived wall impedance figures.
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