Abstract
Perforated pipes are frequently used to attenuate exhaust noise in contemporary automotive mufflers. Resonances at a particular frequency, however, may exceed the overall acoustic reduction effect of the muffler when the shape and fixing position are inappropriate. The theoretical calculations of the sound pressure inside the elliptical perforated tube muffler are carried out by solving the wave equation. The resonance mechanism of the perforated tube muffler is analyzed. The results of the analyses have been confirmed by experiments. © 2000 Scripta Technica, Electron Comm Jpn Pt 3, 83(8): 51-60, 2000
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