An Improvement of Transmission Loss on Reactive Muffler by using Helmholtz Resonator

The paper shows an improvement of acoustical transmission loss on single expansion chamber muffler by using Helmholtz resonator with same gas volume. A reactive muffler (silencer) is an important noise control equipment for reduction of exhaust noise and other noise source which involves the flow of gases. Mufflers are typically arranged along the exhaust pipe as the part of the exhaust system of an internal combustion engine to reduce its noise. Here basic term is used for noise attenuation namely transmission loss (TL). An experimental method for muffler’s transmission loss (TL) measurement for central inlet and central outlet muffler shows the validation of result. Finite element analysis tools comsol multiphysics used to validate the results. The wave 1-D is also used to validate the results. This paper is involving an improvement of transmission loss on first cut off frequency by the modeling of Helmholtz resonator.