Design and Analysis of Automotive Mufflers for Noise Attenuation in Low and Broadband Frequency Range

Abstract

Noise pollution is the major drawback of Internal Combustion engines. Automotive engineers and researchers have been working consistently on reducing automotive noise as well as pollution. While designing the mufflers, care must be taken not only for noise reduction but also for back pressure, space constraints, cost incurred, etc. Various methods to design and analyze the mufflers have been devised by researchers across the globe. In this paper an attempt has is made to present a Tuning of muffler for Low and broadband noise. Geometrical parameters influencing design of Helmholtz Muffler has been carried out in this Study. For Broadband noise, impact of Porosity and wool packing material has been chosen as a design parameter. Results observed that for exhaust system with two muffler components we have dedicated Helmholtz chamber, while for exhaust system with single muffler component, internal of muffler to have both broadband and Helmholtz integrated. Reactive mufflers like Two pass mufflers and Three pass mufflers can be taken as an initial reference to have acoustic tuning for both Helmholtz and broadband noise tuning.