Finite element analysis of acoustic attenuation performance of perforated tube silencers

Three-dimensional finite element method was developed to predict and analyze the acoustic attenuation characteristics of perforated tube silencers. Comparisons of transmission loss predictions with experimental results for straight-through perforated tube silencers and three-pass perforated tube silencers illustrated that the finite element method could predict acoustic attenuation characteristics of perforated tube silencers accurately. The finite element method was then used to investigate the effects of geometrical parameters on the transmission loss of three-pass perforated tube silencers. The duct extensions into the chambers led to lower resonant frequencies. To improve the low frequency acoustic attenuation of a typical three-pass perforated tube silencer,an end-resonator might be added on the right side of the three-pass perforated tube silencer.