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高速列车表面气动噪声源的频谱分析

发表时间:2014-06-30  浏览量:1537  下载量:627
全部作者: 崔鹏翔,李人宪
作者单位: 西南交通大学机械工程学院
摘 要: 利用计算流体力学方程大涡模拟数值计算方法,计算高速列车运行时周围的动态流场,得到表面压力脉动分布状况。采用傅里叶变换方法将时域的气体压力脉动值转换为频域的声强分布,获得高速列车表面任意点的偶极子声源强度频谱特征。计算结果表明:列车表面各点偶极子声源一般均在低于1 000 Hz时出现最大值,在产生气体分离涡的位置会产生较大的声强,最大声强出现在头车第一个转向架位置。
关 键 词: 车辆工程;高速列车;气动噪声;偶极子声源
Title: Spectrum analysis of aerodynamic noise source on surface of a high-speed train
Author: CUI Pengxiang, LI Renxian
Organization: School of Mechanical Engineering, Southwest Jiaotong University
Abstract: Large eddy simulation method is used to solve the fluid field equations around a high-speed train. From the solutions of these equations, aerodynamic pressure pulsation distributing on the train surface is obtained. Consequently, the pressure pulsation definition in time domain is converted to sound intensity definition in frequency domain by Fourier transform. After that, the characteristic of frequency spectrum of dipole source intensity at any point can be obtained. Calculation results show that the maximum value of dipole sound intensity appears when the frequency range was lower than 1 000 Hz, large sound intensity appears at the position of separate eddy of air and the maximum sound intensity appears at position of the first bogie.
Key words: vehicle engineering; high-speed train; aerodynamic noise; dipole sound source
发表期数: 2014年6月第12期
引用格式: 崔鹏翔,李人宪. 高速列车表面气动噪声源的频谱分析[J]. 中国科技论文在线精品论文,2014,7(12):1173-1178.
 
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