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采用计算气动声学研究高速列车表面偶极子声源外辐射的指向性
引用本文:郑拯宇,李人宪.采用计算气动声学研究高速列车表面偶极子声源外辐射的指向性[J].现代制造工程,2012(6):42-46.
作者姓名:郑拯宇  李人宪
作者单位:1. 西南交通大学机械工程学院,成都610031;重庆理工大学重庆汽车学院,重庆400054
2. 西南交通大学机械工程学院,成都,610031
基金项目:教育部博士学科点专项科研基金资助项目,重庆市科委自然科学基金资助项目,重庆市教委科学技术研究项目
摘    要:将边界元声场分析方法与流体动力学分析技术有机结合起来,在某高速列车边界元模型中,导入流场脉动压力数据并在声学网格上转换成气动偶极子声源边界条件,采用直接边界元算法实现了基于表面偶极子声源的列车气动噪声外辐射声场的数值仿真,在此基础上对列车气动噪声外辐射场声压力分布规律以及车身表面偶极子源外辐射的指向性等特性进行了分析。研究表明:列车两侧的正横方向为车身表面偶极子声源主要水平声辐射方向,在离声源中心25m距离上可达80dB左右;车顶上方为主要横向声辐射声域,25m距离上可达83dB;频率越高,车身表面偶极子声源的指向性越强。

关 键 词:车辆工程  气动噪声  计算气动声学  偶极子声源  边界元法  指向性分析

External directivity analysis of high-speed train' s surface dipole acoustic source based on the computational aero-acoustics
Zheng Zhengyu , Li Renxian.External directivity analysis of high-speed train' s surface dipole acoustic source based on the computational aero-acoustics[J].Modern Manufacturing Engineering,2012(6):42-46.
Authors:Zheng Zhengyu  Li Renxian
Affiliation:1 (1 School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China; 2 Chongqing Automobile College,Chongqing University of Technology,Chongqing 400054,China)
Abstract:Based on Lighthill’s analogy,the Boundary Element Method(BEM) combined with the Computational Fluid Dynamics(CFD) utilized to simulate the external aerodynamic noise field of high-speed train by converting the fluctuating flow pressure near the vehicle’s surface into the dipole source boundary condition in acoustics grid.The distribution of vehicle’s external aero-acoustics field and the external directivity of vehicle’s surface aerodynamic acoustic dipole source were also discussed carefully.The results show:the perpendicular direction to the lateral sides of the train is the main horizontal radiation of surface dipole acoustic source,and the Sound Pressure Level(SPL) may up to 80dB at 25m away from the acoustic source center;above the roof is main radiation in traverse direction;the train’s surface aerodynamics acoustic source directivity enhances with frequency increases.
Keywords:vehicle engineering  aerodynamics noise  Computational Aero-Acoustics(CAA)  dipole source  Boundary Element Method(BEM)  directivity analysis
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