Abstract
Measurements of the acoustic insertion loss of poroelastic plates with different perforation ratios, mounted transversely across a flow duct, without and with flow have been made at various locations in the duct. For the lower perforation ratio the insertion loss is found to be approximately 3 dB higher with air flow than without over the frequency range of the measurements. A parallel impedance model has been formulated to predict the effects of perforation on the insertion loss without flow. Measurements and predictions without flow have been found to be in reasonable agreement.
| Original language | English |
|---|---|
| Pages (from-to) | 506-513 |
| Number of pages | 8 |
| Journal | Applied Acoustics |
| Volume | 69 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jun 2008 |
| Externally published | Yes |
Keywords
- Absorption
- Insertion loss
- Mean flow
- Perforated plates