Abstract:

For studying the wind noise on A?pillar and rear?view mirrors， a simplified vehicle model is built. Based on aero?acoustic wind tunnel tests， five models with different styling features are designed. With A?weighted sound pressure level and articulation index as the evaluation indicators， the wind noise on the surface of side window， that in the far field and that inside the vehicle are comparatively analyzed. The results show that high?frequency noise attenuates faster in the area of A?pillar vortex， and the square A?pillar has a significant masking effect on the noise on rear?view mirror. There is a pressure level peak in the noise on rear?view mirror， and the corresponding characteristic frequency increases with the rise of wind speed. As the wind speed increases， the wind noise on the windows， that in the far field and that inside the vehicle of all models increases apparently. When yawing， the wind noise on the windows shows a tendency of falling on the windward side and rising on the leeward side in the whole frequency range. The far?field noise and the interior noise show the same trend in different frequency bands.

Key words: aerodynamic noise, A pillar, rear?view mirror, aero?acoustic wind tunnel, simplified model