Tuning acoustic performance of multi-chamber hybrid mufflers

In this paper, we investigate the functional acoustic performance of multi-chamber mufflers using a numerical approach. The wave propagation governing in expansion chamber domains is first introduced and solved by finite element method. Our results selected muffler configurations are compared with reference predictions model experiments order to validate present procedure. Then, influence geometry characteristics typical hybrid multi-chambered (number sub-chambers, micro-perforated tube structure) on their sound transmission loss studied. obtained indicate that structure considered has strong effect acoustical performance, location high level resonances behavior strongly related number sub-chambers as well characteristics. By tuning geometrical parameters (e.g., having small perforation ratio), enable design higher (up 110 dB) at low frequencies (~ 195 Hz) but constraint space length 300 mm).