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2010•Unpublished venueRequires access

Effects of Higher Order Mode Waves on Muffler Performance

Zeng Fa-lin, Dehua Li, Yuping Zeng

Open publisher page 3 citations

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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OpenAlex reports 3 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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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, Acoustics, Expansion chamber, Transmission loss, Sound pressure, Mode (computer interface), Finite element method, Inlet

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