Abstract
Mufflers are very important elements in industry for the attenuation of exhaust noise in vehicles and machinery. Recent advances in modeling procedures, for accurate performance prediction, lead to the development of the transfer matrices method for more practical muffler components appearing in commercial designs. Muffler designers are looking for simple, quick modeling tools, especially in the preliminary evaluation stages of a design. Finite element (FEM) and boundary element (BEM) methods, in spite of giving results in a wide range of frequencies, are still expensive, need very skilled operators, and commercial software is still not user friendly. Plane wave modeling, using the transfer matrix form, offers a cheap and quick method for muffler designers to arrive at an initial prototype solution. In this paper, transmission loss calculations are presented for several practical muffler configurations in explicit formulas and comparison with experimental results are presented.
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