摘要
某车型的空调系统在样车阶段存在噪声大的气动噪声问题,其噪声频谱在500 Hz以下存在明显峰值,在主观上隆隆声感知强烈,影响车辆的声品质水平。通过CFD对流场阻力的优化和试验验证,噪声问题得到一定程度的改善,但气动噪声问题仍然存在,其发生的机理和位置不能确定。由于进行整车模型气动噪声模拟所需求的资源多、时间长,因此采用简化风道进行对子系统的模拟分析。文中利用气动噪声仿真计算方法,对风道内的噪声生成和传播进行了模拟和研究。文中采用简化风道的子系统CFD模型,研究气流速度大小及方向对出口噪声的影响。结果显示,气流方向与管壁形成15°的夹角时,管内气流发生分离现象,产生了500 Hz下的低频噪声。
The problem of air-conditioning noise occurred in the Prototype stage of a development vehicle project,the noise spectrum has an obvious peak below 500 Hz,Subjectively,rumble sound perception is strong,affects the sound quality level of vehicles.Used CFD tool optimize duct resistance,the noise problem has been improved,but the aerodynamic noise problem still exists,thereason of noise not be determined.Using real air-conditioning model to study aerodynamic noise needs more resources and longer time,so the simplified duct is used to study.In this paper,the generation and propagation of noise in air duct are simulated and studied by using the method of aerodynamic noise simulation.In this paper,using aerodynamic noise simulation method,studied the influence of airflow velocity and direction on exit noise.The results show that the air flow direction forms an angle of 15°with the pipe wall,the air flow in the pipe will separate,Low frequency noise below 500 Hz is generated.
作者
邓玉伟
潘作峰
侯杭生
DENG Yu-wei;PAN Zuo-feng;HOU Hang-sheng(General R&D Institute of China FAW Group Co.,Ltd.,Changchun 130011;State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise&Safety Control,Changchun 130011)
出处
《机械设计》
CSCD
北大核心
2020年第S02期176-180,共5页
Journal of Machine Design
关键词
风道
气动噪声
空调噪声
CFD
duct
aerodynamic noise
air-conditioning noise
CFD
