Abstract: In order to study the spatial distribution pattern, frequency characteristics and influencing factors of interior aerodynamic noise of a passenger car for modifying design and lowering noise, a noise test is conducted on a SUV in the wind tunnel of Jilin University. The results show that aerodynamic noise is mainly composed of leakage noise and shape noise, and exhibits spatially symmetric distribution between left and right, but a typical phenomenon is found that the leakage noise at front row is higher than that at rear row, while the shape noise at rear row is higher than that at front row. The sound pressure level of interior noise increases linearly with the increase of wind speed and also goes up with the rise of yaw angle. In the locality on the leeside, the noise obviously deteriorates due to airflow separation becoming severer, while the noise on windward side has just little changes. According to test results, a series of modification schemes for reducing interior noise are adopted, including locally upsizing the sealing belt near A-pillar, plugging the harness hole for rearview mirror with sound insulation foam, using a new-style rearview mirror with a flared shape and a thinner bracket, and pasting damping pieces on door and roof panels. As a result, the interior aerodynamic noise of vehicle is effectively attenuated

Key words: interior aerodynamic noise, wind tunnel test, wind speed, yaw angle, articulation index