The method of sound intensity measurement and analysis is used to identify noise source of motorcycle and accurately judge the exhaust muffler and air filter is the main noise source.on the basis of this

by optimizing muffler structure

accelerating noise of motorcycle can be reduced by 11% through experiment

such as extending the expansion tube length of indoor and outdoor

increasing the number of porous of inner tube surface and the hole diameter

installing the shielded partitions out of the motorcycle muffler

depositing sound-absorbing material inside.Research results show that the method of sound intensity test and analysis is an effective method for noise source identification and sound field analysis for motorcycle.The new improved exhaust muffler have a demonstrable effect on the vehicle’s noise reduction.