Acoustic Characteristics of Perforated Sheets With Throughflow in a High Intensity Noise Environment
✍ Scribed by M. Salikuddin; A.A. Syed; P. Mungur
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 1021 KB
- Volume
- 169
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
An impedance tube technique is described to measure the normal acoustic impedance of perforated sheets with throughflow in a high intensity sound environment. Experimental results for perforated samples covering a range of hole diameters and porosities are presented in this paper for varying throughflow and acoustic intensities. The general behavior of perforated sheets is that the acoustic resistence increases with particle velocity and with throughflow, that the effect of acoustic intensity is relatively small on the resistance in the presence of through flow, that the acoustic reactance first decreases and then increases with throughflow, and that both resistance and reactance decrease with increasing porosity.