Е-Публикации
Технически университет - София

Abstract: In this paper, the influence of the cross-sectional area format of a resonator-type muffler on the noise reduction performance is investigated. The study is implemented in the frequency range from 50 to 4500 Hz. Only resonant type mufflers are investigated. The variation of sound pressure level at the output of the muffler is investigated over the one-third octave band. The aim of the study is to determine the influence of the geometrical shape of the muffler cross-section on its acoustic characteristics. Mufflers with ten simple geometrical cross-section shapes were investigated. The tested mufflers have equal cross-sectional areas and equal lengths (volumes). The inlet and outlet pipes are coaxial. Based on the study, the most effective cross section of a muffler of resonant type is determined. The results are analysed, and appropriate conclusions are drawn.

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