Abstract : The internal combustion engine is major source of noise pollution. The engines finds wide application base as in various manufacturing machineries, locomotives and automobiles. The maximum contribution to noise pollution is shared by exhaust noise and noise which is produced on account of friction of various parts. Muffler is a device used to reduce noise within the exhaust system. It is arranged along the exhaust pipe for the purpose of noise attenuation. In the present work, an attempt has been made to study the effect of extended Inlet and Outlet elements in Single Expansion Chamber reactive muffler on the muffler’s capacity of noise reduction (i.e. Transmission Loss). The acoustic behaviour of the muffler is investigated in detail by: (1) the finite element method by using COMSOL Multi-Physics, (2) and Experimental validation by using Two Load Method.

Keywords : Reactive muffler, Transmission Loss, Finite Element Analysis, Two Load Method.