Abstract
There has been considerable research done on multi-chamber mufflers used
in the elimination of industrial venting noise. However, most research has
been restricted to lower frequencies using the plane wave theory. This has
led to underestimating acoustical performances at higher frequencies.
Additionally, because of the space-constrained problem in most plants, the
need for optimization of a compact muffler seems obvious. Therefore, a
muffler composed of multiple rectangular fin-shaped chambers is proposed.
Based on the eigenfunction theory, a four-pole matrix used to evaluate the
acoustic performance of mufflers will be deduced. A numerical case for
eliminating pure tones using a three-fin-chamber muffler will also be
examined. To delineate the best acoustical performance of a
space-constrained muffler, a numerical assessment using the Differential
Evolution (DE) method is adopted. Before the DE operation for pure tone
elimination can be carried out, the accuracy of the mathematical model
must be checked using experimental data. The results reveal that the
broadband noise has been efficiently reduced using the three-fin-chamber
muffler.
Consequently, a successful approach in eliminating a pure tone using optimally
shaped three-fin-chamber mufflers and a differential evolution method
within a constrained space has been demonstrated.
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