Calculation and Analysis of Acoustic Characteristics of Straight-Through Perforated Pipe Muffler Based on Multilayer Sound Absorbing Material

Using the multi-physical field simulation software COMSOL, the acoustic characteristics of the multilayer sound absorbing material straight-through perforated pipe muffler are studied by the finite element method. The results show that the finite element calculation of the multilayer sound absorbing material straight-through the perforated pipe muffler agrees well with the experimental measurement results. The reliability of the finite element method for studying the acoustic performance of the straight-through perforated pipe muffler with multilayer sound absorbing materials is shown. Furthermore, the influence of some structural parameters of porous sound absorbing material and micro-perforated plate on the acoustic performance of the multilayer sound absorbing material straight-through perforated pipe muffler is analyzed. The muffler based on multilayer sound absorbing material is different from the traditional muffler. After applying the multilayer sound absorbing material to the straight-through perforated pipe muffler, the transmission loss value greatly increases, which provides new ideas and directions for future research on the muffler.