Identification of sources of noise emitted by accelerating vehicle based on transfer path and its improvement
To reduce the pass-by noise of a passenger car,the data of the target point is collected according to the process of the external noise test,and the noise curve and vehicle displacement curve of the target point are analyzed to obtain the vehicle position at the maximum noise of the target point.The transfer path analysis(TPA)model from the main sound source components to the target points outside the vehicle is established,and the noise frequency is analyzed by frequency spectrum.The main noise source is determined by the transfer path analysis,and the main noise source engine is optimized.The results show that the maximum noise of the vehicle is 4.6 m above the center line of the test site,the maximum noise source is the engine,and the noise frequency is 140-180 Hz.When the engine speed is 4 500 r/min,the torque rise step is reduced,and the outside noise is reduced by 2.6 dB,which meets the standard limit requirements.The transfer path analysis method can provide a reference for the identification and improvement of external noise sources of accelerating vehicles.
noise emitted by accelerating vehicleTPAnoise source identificationspectral analysis
NETL
NSTL
万方数据
