Abstract : The internal combustion engine is the major source responsible for noise pollution. A 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. Exhaust noise from engines is one of component noise pollution to the environment. Exhaust systems are developed to attenuate noise meeting required dB levels and sound quality; emissions based on environment norms. Set up for experimental analysis is developed to predict the acoustic performance of reactive muffler using the two-load method. The decrease in the exhaust noise level is controlled by muffler construction and operating techniques. Therefore, the muffler configuration plays an important role. In this research work, an effort has been made to study the different methodologies for evaluation of transmission loss for extended inlet & outlet tube parameters of single expansion chamber reactive muffler. The detail study of acoustic performance of the muffler is carried out by: (1) Theoretical analysis (2) The finite element method by using COMSOL Multi-Physics, (3) Experimental validation by method of two loads.
Keywords - Transmission Loss (TL), Single Expansion Chamber reactive muffler, Numerical Method, Experimental Method, Inlet & Outlet tubes.