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Abstract

Mufflers hybridized with a single dissipative tube have been extensively researched; however, there has been a palpable lack of work directed toward mufflers conjugated with multiple parallel dissipative tubes that disperse venting fluid and reduce secondary noise. That being so, an analysis of the Sound Transmission Loss (STL) of two-chamber mufflers with multiple parallel dissipative tubes that are optimally designed to perform within a limited space will be considered, here. By using a decoupled numerical method, a four-pole system matrix for evaluating acoustic performance (STL) emerges. During the optimization process, a simulated annealing (SA) method, which is a robust scheme utilized to search for the global optimum by imitating a physical annealing process, is used. Before dealing with a broadband noise, the STL’s maximization relative to a one-tone noise (400 Hz) is offered to confirm the SA method’s reliability. Subsequently, the mathematical model is checked for accuracy, and three types of mufflers (mufflers A-C) hybridized with one, two, and four parallel dissipative tubes are assessed. To bring into focus the acoustical interaction between the dissipative tube (with wool filled within a set of perforated tubes) and the non-dissipative tube (without wool within the perforated tubes), two types of mufflers (one and four nondissipative tubes) have been surveyed. Results divulge that the maximal STL is located at the desired tone, and the acoustical performance of two-chamber mufflers conjugated with multidissipative tubes decreases as a result of the decrement of the acoustical function for acoustical elements (II) and (III). Consequently, optimally designed two-chamber mufflers with multiple parallel dissipative tubes that avoid secondary noise induced by high speed flow while simultaneously maximizing acoustical performance within a constrained space are preferable.

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