Sahil Jadhav

These days, noise pollution is becoming worse due to the faster globalisation of nations, and its effects on human health go beyond hearing impairment. As a result, effective noise pollution control methods are needed. Use a composite reinforced with natural fibres for acoustical purposes. Natural fiber-reinforced composites have several benefits, such as being inexpensive, simple to produce, and eco-friendly. Additionally, natural fibre improves composite sound absorption, structural stability, and mechanical durability. The methods for assessing the acoustical properties of composites improved by natural fibres are described in the paper. Acoustical measures, such as sound transmission losses and absorption efficiency, are also evaluated. This work also examines a factor that influences the mechanical and acoustical properties of composites reinforced with natural fibres. The variables that determine the outcome include the fiber's characteristics, density, sample thickness, porosity, adhesive material, and filler substance. Increases in the percentage of fibre weight, binder material, and filler material improve the durability and sound absorption of natural fiber-reinforced composites.

Environmentally speaking, noise pollution is a major problem, especially when it comes to diesel engines, which produce a lot of noise because of their high compression ratios. For four-wheelers and two-wheelers, respectively, the Central Pollution Control Board (CPCB) in India has established allowable limits of 75 dB and 80 dB. Therefore, lowering noise levels is essential to complying with CPCB requirements. Mufflers, which are intended to reduce sound transmission from exhaust gases, are one method of lowering exhaust noise. The design and functional elements of a muffler affect how well it reduces noise. Mufflers can also affect the fuel economy and emissions of a vehicle, among other aspects. As a result, before to production and deployment, a detailed analysis of muffler designs is required. Performance of mufflers is influenced by a number of variables, including perforations, back pressure, insertion loss, and transmission loss. This review paper's major goal is to locate a muffler design that may successfully reduce noise levels while simultaneously lowering back pressure, which can impair engine performance. The twin expansion chamber reactive muffler's acoustic study will be the main focus, with various parameters to improve transmission loss being taken into account.

Internal combustion engines, in particular, contribute significantly to societal noise pollution. Mufflers are typically used at the end of an exhaust system to reduce noise. The muffler's components' design and use determine how well it lowers noise. As a result, it is critical to design mufflers that reduce noise to the greatest extent possible. In this study, the Transmission Loss (TL) of a single expanding chamber reactive muffler will be measured utilizing a variety of approaches. The Acoustic Examination of the Silencer is carried out using three methods: theoretical analysis, finite element approach using COMSOL Multi-Physics, and experimental analysis using the two-load method.