摘要
以汽车天窗产生的气动噪声为研究对象,根据CFD分析原理及汽车结构特点建立仿真模型,对模型的粒子数量和气动阻力系数进行相关性验证。采用格子玻尔兹曼法与大涡模拟算法相结合的方法,研究汽车相对行驶速度以及天窗开启状态对气动噪声的影响规律。研究结果表明:当汽车与空气的相对速度为25 km/h时,声压达到最大值125.67 dB,对应的激振频率为28 Hz;相比于声压幅值,天窗开启状态对声压的波动性影响更为显著。
Taking the aerodynamic noise produced by the sunroof as the research object,the simulation model is established according to the principle of CFD analysis and the characteristics of the vehicle structure.The correlation between the number of particles and aerodynamic drag coefficient is verified.The grid Boltzmann method and the large eddy simulation method are used to study the influence of the relative speed of the vehicle and the opening state of the sunroof on the aerodynamic noise.The results show that when the relative speed of vehicle and air is 25 km/h,the maximum sound pressure is 125.67 dB,and the corresponding excitation frequency is 28 Hz.Compared with the amplitude of sound pressure,the opening state of skylight has more significant influence on the fluctuation of sound pressure.
作者
闫春丽
YAN Chun-li(Yantai Automotive Engineering Career Academy,Yantai 265500,China)
出处
《液压气动与密封》
2021年第4期44-47,共4页
Hydraulics Pneumatics & Seals
基金
山东省自然科学基金项目(ZR2016EEB36)。
关键词
气动噪声
气动阻力
CFD模型
研究
aerodynamic noise
aerodynamic resistance
CFD model
research
