A Study on the Effects of Higher Order Mode Wave on Mufflers Performance

Hongguang Liu, Senlin Lu, Falin Zeng, Zhangping Lu, Jiangkun Zhou


Based on the existence of higher order mode waves (HOMW) in expansion mufflers is proved theoretically, a 3-D FEM is used to obtain the four-pole parameters of a muffler which are in turn used to calculate the transmission loss. With this method, the distribution of sound pressure in a muffler is calculated, the effects of HOMW on the muffler performance are investigated and a technique to improve the muffler performance is put forward. It is shown that, because of HOMW, the sound wave in expansion chamber is not in plane form; HOMW can descent capability of muffler, and the position of inlet and outlet is important to the performance of mufflers.

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DOI: https://doi.org/10.5539/mas.v3n1p170

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