In this study, a new approach is presented for modeling concentric
partially perforated intruding tube muflers. For acoustic impedance in the
linear regime, a closed form solution of the partially perforated intruding
tube m@er transmission loss was first obtained. With this restriction and
in the case of zero mean flow, excellent agreement between predicted and
experimental results for various mufleer configurations demonstrates the
utility and potential of the modeling approach used in the present study.
By tuning the lengths and associated physical parameters to the in-situ
case of various straight-through tubular elements, one can achieve rapid
and economical modeling of those that are frequently used in many commercial
reactive mufleers. This modeling ability is very useful to a mufleer
designer especially in the preliminary design stage.