SIMPLIFIED TECHNIQUES FOR PREDICTING THE TRANSMISSION LOSS OF A CIRCULAR DISSIPATIVE SILENCER
✍ Scribed by R. KIRBY
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 423 KB
- Volume
- 243
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
A closed-form analytical solution for the transmission loss of a dissipative silencer with a circular cross-section is described. The silencer contains a bulk reacting acoustic absorbent which is separated from a mean gas #ow by a perforated screen. Theoretical predictions of the silencer transmission loss for three di!erent dissipative silencers are compared both with experimental data and with another more complex modelling technique. Good agreement is noted between the analytical theory and experimental data in the low-to-medium frequency range. Below a de"ned upper frequency limit the analytical technique is also shown to provide good agreement with the "nite element method. In addition it is observed that, even for relatively high open area porosities, the perforate screen has a signi"cant e!ect on dissipative silencer performance.