The Study on Automobile Engine Noise based on Sound Intensity Method

Automobile noise contains a variety of different noise. It can be divided into the engine noise and chassis of noise. The engine noise is main noise sources of automobile noise, and can be roughly divided into pneumatic noise, combustion noise, and mechanical noise. These are caused by the recruit vibration of the students in air, when a car engine exhausts fan rotation, these voices, the light into the air directly. No, the largest into exhaust muffler for automobile engine exhaust noise, another kind is the source of the intake noise. Fan noise, usually main noise sources especially air-cooled engine. Combustion noise, mechanical noise is difficult to disaggregate. Study on emission of vehicle noise frequency characteristics and energy distribution characteristics, with the optical image automatic overlapping, obtained the vehicle noise source frequency, spatial location and origin. The test results show that, the microphone array technology is an effective way for noise diagnosis and sound localization, for noise control of vehicle to provide a scientific basis.