Finite Element Calculation and Analysis of Acoustic Attenuation Performance of Perforated Tube Silencers

The predicted transmission loss of perforated tube silencers using the finite element method and experimental results are compared and showed good agreement. The comparison of transmission loss predictions of two perforated tubes silencers with same porosities and different hole diameters and a simple expansion silencer with the same diameter and length as the perforated tube silencers shows that the influence of the perforated tube on the silencer's acoustic performance is marginal at lower frequencies, important at medium frequencies and limited at higher frequencies.