An Overview of Acoustic Investigation of a Dual Expansion Chamber Reactive Muffler

Shravani Kulkarni

Abstract: Noise pollution is a significant environmental issue, particularly with diesel engines, which generate considerable noise due to their high compression ratios. In India, the Central Pollution Control Board (CPCB) has set permissible noise limits of 75 dB for four - wheelers and 80 dB for two - wheelers. To adhere to these standards, reducing noise levels is crucial. One effective method is the use of mufflers, which are designed to attenuate the sound produced by exhaust gases. The efficiency of a muffler in reducing noise depends on its design and operational characteristics. Additionally, mufflers can influence factors such as fuel efficiency and vehicle emissions, necessitating a thorough evaluation of their design before production and implementation. Various parameters, including perforations, back pressure, insertion loss, and transmission loss, play a vital role in determining muffler performance. This review focuses on identifying a muffler design that can effectively minimize noise levels while also reducing back pressure to prevent any adverse effects on engine performance. Special emphasis is placed on the acoustic analysis of a twin expansion chamber reactive muffler, considering different parameters to optimize transmission loss.

Keywords: Dual Expansion Chamber Reactive Muffler, Backpressure, Numerical Analysis, Experimental Analysis, Transmission Loss