Analysis of the Automobiles External Aerodynamic Noise Field Characteristics Based on CAA
This paper dwelled on the principle of Computational Aero-Acoustics (CAA), and utilized the Boundary Element Method (BEM) combined with the Computational Fluid Dynamics (CFD) based on Lighthills analogy to the automobile flow model, and converted the fluctuating flow pressure near the vehicles surface into the dipole source boundary condition in acoustics grid, and eventually succeeded in simulating the external aerodynamic noise field of automobile by introducing the dipole source boundary condition into the automobiles BEM model. The distribution of vehicles external aero-acoustics field and the directivity of vehicles surface aerodynamic acoustic dipole source were also discussed carefully in this paper. The results show that: The head and tail of car are the main aerodynamic noise source radiation areas, and most of the dipole sources SPL value is more than 70dB; the variation in car speed greatly impacts on the directivity of aerodynamic noise field near the cars tail surface(9=165°~195° ).
Vehicles-Noise Aeroacoustics Computational Aero-Acoustics Dipole source BEM
ZHENG Zheng-yu LI Ren-xian
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China Chongqing Aut School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
国际会议
合肥
英文
58-62
2011-09-23(万方平台首次上网日期,不代表论文的发表时间)