Volume 2
Maximum Sound Transmission Loss in Multi-Chamber Reactive Silencers: Are Two Chambers Enough?
Authors
Hakan Arslan, Mostafa Ranjbar, Zeynep Mutlum
Abstract
The transmission loss performance of multi-chamber silencer with respect to its number of chambers is studied. At this regard, theoretical values of sound transmission loss (STL) for various geometries of silencers with different number of baffles have been calculated by the transfer matrix method. Also, the sound transmission loss for the considered models have been measured experimentally. The main aim is to find the effect of number of chambers on the performance of silencers. Indeed, the target is to find the best number of chambers so that it can lead to the maximum sound transmission loss. It is realized that by increasing the number of chambers, the sound transmission loss can be improved. However, this can be happened when the number of baffles is not more than three. Because after that, the increasing of baffles has not a significant effect on the maximization of the transmission loss. It is confirmed that a silencer with two chambers is well enough to enjoy from the highest sound transmission loss over the frequency range of 0 to 3000 Hz. The length of baffles is important according to the considered frequency ranges. If the maximization of transmission loss over the low frequency ranges is on demand, the length of the first chamber should be more than others. However, for high frequency ranges the length of the second chamber should be more.
Keyword: Primary subject classification, reactive silencer, noise, transmission loss, multi-chamber, baffle number.
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