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2007•Journal of Jiangsu UniversityRequires access

Effects of higher order mode waves on muffler performance

Shi‐An Chen

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Abstract

The existence of higher order mode waves(HOMW) in expansion mufflers is proved theoretically.The 3-D finite element method 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 obtained,the effects of HOMW on the muffler performance are investigated and a technique to improve the muffler performance is put forward.It shows that,because of HOMW,the sound wave in expansion chamber is not in plane form;HOMW can decrease the capability of muffler;and the positions of inlet and outlet are important to the performance of mufflers.

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What this paper is about

The existence of higher order mode waves(HOMW) in expansion mufflers is proved theoretically.The 3-D finite element method 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 obtained,the effects of HOMW on the muffler performance are investigated and a technique to improve the muffler performance is put forward.It shows that,because of HOMW,the sound wave in expansion chamber is not in plane form;HOMW can decrease the capability of muffler;and the positions of inlet and outlet are important to the performance of mufflers.

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Available abstract

The existence of higher order mode waves(HOMW) in expansion mufflers is proved theoretically.The 3-D finite element method 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 obtained,the effects of HOMW on the muffler performance are investigated and a technique to improve the muffler performance is put forward.It shows that,because of HOMW,the sound wave in expansion chamber is not in plane form;HOMW can decrease the capability of muffler;and the positions of inlet and outlet are important to the performance of mufflers.

Key concepts: Muffler, Expansion chamber, Acoustics, Transmission loss, Sound pressure, Finite element method, Inlet, Engineering

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