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《Journal of Vibration and Shock》 2018-12
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Numerical investigation and optimization of vehicle buffeting noise based on unstructured dynamic mesh and non-smooth surface rain guard

ZONG Yiqi;GU Zhengqi;LUO Zemin;JIANG Caimao;ZHANG Qidong;College of Mechanical Engineering,Yangzhou University;State Key Laboratory of Advanced Design and Manufacture for Vehicle Body,Human University;Hunan University of Arts and Science;Automotive Engineering Research Institute,Guangzhou Automobile Group Co.,Ltd.;  
Vehicle buffeting noise and opening degree of side-window are inextricable. At present,numerical study of wind buffeting noise is limited to the simulation of fixed opening. To find out the window opening degree which is responsible for the maximum wind buffeting noise,it is necessary to study wind buffeting noise of continuous opening vehicle side-windows. The dynamic mesh technology integrating partial unstructured grids with a spring-based smoothing method and a remeshing method was applied to simulate the cavity buffeting noise. Simulation results show that virtual prediction agrees well with the traditional prediction. This method was employed to compute the vehicle buffeting noise based on continuous opening degree of side-window. The results of simulation coincide well with the results of traditional method and road test. It demonstrates that this method has surpassed the method of fixed opening degree,which more practically simulates the buffeting noise in the process of opening the side-window. Buffeting characteristics was analyzed under the case of opening degree corresponding to maximum noise. Through the establishment of non-smooth surface rain guard near the rear side window,ideal noise reduction effect was obtained by using the multi-objective genetic algorithm and optimizing structure parameters. The results show that the rain guard can reduce the number of rear vortex of passenger compartment,decrease the flow velocity of reflux vortex,and transform laminar flow around the window into turbulence,thus the energy and intensity of turbulent flow are directly affected by such rain guard structure. Sound pressure level of monitoring point declines from 129 d B to 123. 82 d B,the extent and rate of descent are about 5 d B and4%,respectively.
【Fund】: 中央财政支持地方高校专项资金项目-创新团队(0420036017);; 国家高技术研究发展计划(863计划)项目(2012AA041805);; 长沙市科技计划重点项目(K1501011-11);; 湖南大学汽车车身先进设计与制造国家重点实验室自主课题资助项目(734215002)
【CateGory Index】: U463.8;U467.493
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