Suppression of Motorcycle’s Exhaust Noise

Khaw, Wai Keong (2018) Suppression of Motorcycle’s Exhaust Noise. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

With a large amount of vehicle population in our country, the noise pollution is getting more serious and affects the human life and environment. The sources of noise can be categorizes into few types which are industrial noise, traffic noise and public noise. Traffic noise is the highest noise level among the others noise and 70% of the traffic noise cause by vehicle noise. The objective of this project is to suppress exhaust noise generated from two-stroke engine which produce high sound pressure level of exhaust noise. The objective of this project is to analyze the performance of different types of mufflers in exhaust noise isolation that the different design of perforated muffler tube affect the exhaust noise level. This project also aim to improve human quality lifestyle with a higher comfortable noise level. Sound pressure level measurement and frequency spectrum analysis have been carried out in order to identify the performance of different types of muffler in decibels, (dB). Modal analysis has been carries out by impact testing and ANSYS Workbench in order to investigate the natural frequencies and mode shapes of muffler are in good correlation to avoid resonance. In the final result and discussion, the improved muffler has been successfully suppressed 20% of the sound pressure level which from 97.1 dB to 75 dB. The end of the result proved that the noise level of exhaust pipe has been suppressed and maintain in a comfortable noise level.