Study on Automobile Aerodynamic Noise based on Pseudo-excitation Method
-
摘要: 采用分离涡模拟(DES)方法对车外流场进行瞬态计算得到车身表面脉动压力,将虚拟激励法应用于求解汽车内部的气动噪声场,利用声振耦合法得到车内场点的声压级频谱。对不同车速不同位置的噪声特性进行了对比分析和道路实验验证。结果表明:汽车气动噪声为宽频谱,在某一特征频率处达到峰值后呈指数型下降;噪声截止频率和峰值频率随着车速的提高向高频移动;声压级大小与脉动压力强度以及辐射面积有关;将虚拟激励法应用于气动噪声求解是可行的。Abstract: The transient exterior flow fields were calculated with a turbulence model: detached eddy simulation (DES) method to get the fluctuating pressure on car body. Pseudo-excitation method (PEM) was used to calculate the interior acoustic fields and the sound pressure level spectrum was got by acoustic-vibration coupling method. Noise characteristics at different field points were compared under different vehicle velocity conditions. Road experiments were implemented to verify the effects of simulations. Results show that the aeroacoustic noise is a kind of noise with wide frequency bands, which decreases in the form of exponential function when reaching the peak value. Both the frequencies of zero value and peak value become higher when the vehicle velocity increases. The amplitudes of sound pressure level are relative to the intensity of fluctuating pressure and the radiation surface areas, and the application of PEM on aerodynamic noise simulations is feasible.
-
Key words:
- flow field /
- turbulence model /
- DES /
- PEM /
- acoustic field
-
[1] George A. Automobile aerodynamic noise[R]. SAE Technical Paper 900315, 1990, doi: 10.4271/900315 [2] 刘红光,陆森林,曾发林.高速车辆气流噪声的试验研究[J].中国公路学报,2005,18(1):113-116,121 Liu H G, Lu S L, Zeng F L. Experimental study of automobile aerodynamic noise[J]. China Journal of Highway and Transport, 2005,18(1):113-116,121 (in Chinese) [3] 王振,谷正气,王宁,等.汽车外场气动噪声仿真与计算[J].湖南工业大学学报,2012,26(1):27-31 Wang Z, Gu Z Q, Wang N, et al. The simulation and calculation of car outfield aerodynamic noises[J]. Journal of Hunan University of Technology, 2012,26(1):27-31 (in Chinese) [4] 卢勇,张继业,刘加利.高速列车车内低频气动噪声预测[J].计算机辅助工程,2013,22(5):7-13 Lu Y, Zhang J Y, Liu J L. Prediction of interior low frequency aerodynamic noise of high speed train[J]. Computer Aided Engineering, 2013,22(5):7-13 (in Chinese) [5] 刘龙贵,谷正气,张勇,等.汽车车身部件气动噪声贡献量数值模拟研究[J].科学技术与工程,2014,14(10):89-94 Liu L G, Gu Z Q, Zhang Y, et al. Numerical simulation study of automobile components aerodynamic noise contributions[J]. Science Technology and Engineering, 2014,14(10):89-94 (in Chinese) [6] Murad N, Naser J, Alam F, et al. Computational fluid dynamics study of vehicle A-pillar aero-acoustics[J]. Applied Acoustics, 2013,74(6):882-896 [7] 陈鑫,王怀玉,高长凤,等.后视镜罩边缘结构对流场和气动噪声的影响[J].航空动力学报,2014,29(5):1099-1104 Chen X, Wang H Y, Gao C F, et al. Effect of rearview mirror edge structure on flow field and aerodynamic noise[J]. Journal of Aerospace Power, 2014,29(5):1099-1104 (in Chinese) [8] 董亮,刘厚林,代翠,等.不同湍流模型在90°弯管数值模拟中的应用[J].华中科技大学学报(自然科学版),2012,40(12):18-22 Dong L, Liu H L, Dai C, et al. Application of different turbulent models to numerically simulating 90° duct bends[J]. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2012,40(12):18-22 (in Chinese) [9] Spalart P R, Jou W H, Strelets M, et al. Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach[C]//First AFOSR International Conference on DNS/LES, Los Angles: Greyden Press, 1997 [10] Spalart P R, Deck S, Shur M L, et al. A new version of detached-eddy simulation, resistant to ambiguous grid densities[J]. Theoretical and Computational Fluid Dynamics, 2006,20(3):181-195 [11] 张强.气动声学基础[M].北京:国防工业出版社,2012 Zhang Q. Basises of aerodynamic acoustics[M]. Beijing: National Defend Industry Press, 2012 (in Chinese) [12] Lighthill M J. On sound generated aerodynamically. I. General theory[J]. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 1952,211(1107):564-587 [13] 林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004 Lin J H, Zhang Y H. Preudo-excitation method of random virbation[M]. Beijing: Science Press, 2004 (in Chinese) [14] 黄剑峰,张立翔,王文全,等.基于大涡模拟的水轮机内瞬态湍流场特性分析[J].排灌机械工程学报,2010,28(6):502-505 Huang J F, Zhang L X, Wang W Q, et al. Large eddy simulation of transient turbulent flow in Francis turbine[J]. Journal of Drainage and Irrigation Machinery Engineering, 2010,28(6):502-505 (in Chinese)
点击查看大图
计量
- 文章访问数: 177
- HTML全文浏览量: 33
- PDF下载量: 8
- 被引次数: 0