Abstract: While the existing evaluation index for vehicle interior wind noise can only reflect macro-weighting of each frequency component with a lack of judgment on partial spectrum problems, it needs to be perfected. By analyzing wind tunnel test data of 23 different mass-produced vehicles, the positive correlation between vehicle type grade and interior wind noise performance is verified,and the spectrum regularity of superior samples is summarized. The results illustrate that leak noise is the main cause of roughness in narrow-range of medium-high frequency band, which should be avoided as far as possible. By adding up the difference between the moving-average spectrum and original spectrum, a method to obtain the quantitative index of spectral roughness is proposed. The results show that spectrum smoothness is closely related to interior wind noise performance and especially sensitive to leak noise, which can be used to evaluate the vehicle interior wind noise level

Key words: wind noise, evaluation method, spectrum analysis, leak noise