Enhancing Sound Transmission Loss in Hybrid Mufflers with Change in Pipe Perforation and Using Absorptive Material

Abstract

It is well known that baffled exhaust mufflers enhance sound transmission loss while lowering noise emissions. Sound transmission loss can be further reduced by adding sound-absorbing material inside the silencer. It has been demonstrated that carefully placed baffles in exhaust silencer systems improve acoustic performance by successfully lowering noise emissions. Sound waves are redirected and disrupted by baffles, which lessens the transmission of undesired noise and creates a more controlled and tranquil acoustic environment. The incorporation of sound-absorbing materials into mufflers is a significant development in noise control technology. Specialized materials are added to the muffler to improve sound wave absorption and drastically reduce noise emissions. This novel method not only enhances acoustic performance but also improves a variety of applications—from industrial gear to automobile exhaust systems—making them quieter and more enjoyable to use. A silencer was constructed for this research project using the finite volume method. The design's efficacy was demonstrated through experimental validation. The research project then used the finite volume technique to produce a silencer with the same dimensions. It then adjusted the design based on different flow percentages, adding a baffle and making pipe perforations, until the optimal silencer design was found. Additionally, this approach provides an optimal design and indicates which sound-absorbing material has the largest sound transmission loss.