Noise Reduction for a Given Vehicle Based on Sound Intensity Measurement Method

In this paper the mechanisms of the bottom radiant noise generation of a given mini vehicle was investigated and the corresponding countermeasures were put forward in reducing the noise of a diesel engine. According to the analysis of acoustic signals and vibration signals measurement, an investigation of the noise source identification in a given vehicle was presented. With the sound intensity method, the major sources of the bottom radiation noise of the engine under three operating conditions were surveyed. The research provides the reliable basis for the engineering practice to reduce vehicle noise level.