Abstract:
The characteristics of the wind noise radiated from vehicle windows of a passenger car depend on its shape, cruising speed, wind direction towards the vehicle and the natural wind condition. For these factors, the vehicle shape is the most important controllable factor. The exterior shape, which significantly affects the wind noise, is decided in the early design stage of the actual vehicle development process. A vehicle driver may be particularly annoyed at open-windows conditions. Thus, a measurement campaign has been carried out in order to characterize the aerodynamic noise generated by air flows through vehicle windows. Noise levels have been measured at the driver ears by varying vehicle speed and driver-side window opened area. Experimental results have shown that the noise is mainly depending on the following physical parameters: vehicle speed, car internal volume, and window open area that creates large pressure differences between the inside and outside of the car. The Light hill acoustic analogy is employed to estimate the far field wind noise