纯电动汽车底盘风噪声源特性研究

The Characteristic of Wind Noise Source on Underbody of an Electric Vehicle

随着上车身引起的风噪声逐渐得到控制,电动汽车车底高速气流对车内噪声的影响逐渐凸显。为了解决纯电动汽车底盘风噪声凸显的问题,采用大涡模拟(LES)的方法,通过分析底盘流场结构和表面脉动压力级,对某电动汽车底盘区域的高速气流噪声源进行了研究。研究表明,底盘的车轮区域成为电动汽车底盘风噪声的主要来源,在汽车底部加装挡风板和侧裙,可以有效改善降低电动汽车的底盘风噪源强度性能。

As the wind noise caused by the upper body of vehicles is gradually being controlled,the influence of highspeed airflow under the vehicle on the interior noise of electric cars is becoming increasingly prominent.To address the heightened chassis wind noise in electric vehicles,the Large Eddy Simulation(LES)method was employed.By analyzing the flow field structure and surface fluctuating pressure levels in the chassis area,the research investigates the sources of high-speed airflow noise.The results show that the wheel area in the underbody becomes the main source of wind noise in electric cars.Adding wind deflectors and side skirts to the underside of the vehicle is an effective way to reduce wind noise intensity from the underbody of electric cars.