To address the problem of low frequency noise of the internal combustion engine,\nseveral existing muffler design methods, such as the theory of the quarter-wavelength\ntube and the Helmholtz muffler, were examined and compared. This paper proposes\na new type of muffler design method, which has the advantages of both the quarterwavelength\ntube and the Helmholtz muffler. An example is carried out to illustrate the\nanalysis of original signal, the design of the new muffler and the improvement of the\nin-car noise. The transmission loss of the new muffler is studied by theoretical method\nand finite element method. The vehicle test of the new muffler demonstrates excellent\nperformance with a wider noise elimination frequency band and smaller radial size.
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