Acoustics performance of mufflers with baffles

K, Nirmal and M S, Mahesh (2018) Acoustics performance of mufflers with baffles. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

Circular ducts are widely used in automobile applications for reduce noise. These duct system con- tains di�erent chambers which are used to reduce the noise during their operation. The noise emitted depends on the structural properties of the duct as well as the acoustics properties of the medium. Current research work studies the noise emitted from the ducts. Ducts with ba�e, without ba�e and multiple numbers of ba�e are used for the analysis, to study the e�ect of the noise emitted. For analyzing the e�ect on noise emitted, the parameter like transmission loss was studied. Numerical and computational approaches were employed in the study. In the current research work, the acoustic performance of circular chamber mu�er with extended inlet/outlet and ba�es is investigated. two approaches are used to �nd the transmission loss of the circular expansion chamber: (1) a one-dimensional (1-D) analytical solution for the concentric con- �gurations; (2) a two-dimensional (2-D) computational solution for the concentric con�gurations by boundary element method. The transmission loss results from analytical approach is shown for spe- ci�c con�gurations. The computational approach is applied to determine the acoustic performance of axi-symmetrical expansion chambers with extended inlet/outlet and ba�es, which compares well with analytical solutions. Some of these e�ects are shown to modify the acoustic behavior drastically, suggesting potential means to improve the acoustic performance.

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