Analysis of Wind Noise Propagation Characteristics of Automobile Based on Statistical Energy Analysis

Abstract:

Wind tunnel test CFD（computational fluid dynamics）and SEA（statistical energy analysis） are used to study the vehicle dynamic pressure and sound field of the external gas artery of the car at 140 km/h to obtain the vehicle SEA model with high accuracy. Based on the model, the transmission of aerodynamic pulsation and the aerodynamic noise from the exterior of the vehicle to the interior space is investigated. The results show that the main contribution of aerodynamic noise in the vehicle comes from the window, the front and the rear windshield. The pulsating pressure outside the vehicle is far higher than the sound field. The sound field dominates in the higher part of the middle frequency noise, while the pulsating pressure dominates in the lower part. It is found that the glass of window has obvious characteristics.

Key words:automobile;aerodynamic noise;fluctuating pressure;statistical energy analysis;computational fluid dynamics