ارزیابی کارایی روش ماتریس انتقال در پیش‌بینی عملکرد آکوستیکی مافلرهای واکنشی و اتلافی

Noise control in systems such as ventilation units, diesel generator exhausts, and HVAC equipment has always been a major engineering challenge. Mufflers equipped with perforated pipes and sound-absorbing layers are widely used due to their high efficiency over a broad frequency range. In this study, the performance of the Transfer Matrix Method (TMM) was evaluated for predicting the acoustic behavior of three types of mufflers: a simple reactive muffler, a reactive muffler with a perforated pipe, and a dissipative muffler with an absorbing layer.

The numerical results obtained from the TMM were compared with experimental data, showing that the method provides high accuracy in predicting transmission loss at frequencies below the cut-off frequency. However, at higher frequencies, discrepancies between theoretical and experimental results increase due to the limitations of the plane-wave assumption and the empirical relations used for the absorbent materials.

Overall, the TMM, owing to its simplicity, computational speed, and acceptable accuracy within the practical range, can serve as a reliable and efficient tool for the preliminary design and optimization of industrial mufflers.