基于某新能源MPV车型低频路噪分析及优化设计

打开文本图片集

中图分类号：TB535 文献标志码：A文章编号：1673-2340（2025）02-0070-09

Analysis and optimal design of low frequency road noise based on newenergyMPVvehicle

BIN Shibo1，XIE Yunhel，ZHENGWeiguang²，WEI Shangjun1，GAO Ting³，LIU Xuewen1 （l.Dongfeng Liuzhou Motor Co.，Ltd.，Liuzhou 545ooo， China; 2.School of Mechanical and Automotive Engineering，Guangxi University of Science and Technology， Liuzhou 5456l6， China; 3.Liuzhou RailwayVocational Technical College，Liuzhou 5456l6，China）

Abstract：Low-frequencyroad noise isa primary contributor to in-cabinnoiseand directlyaffectsoverall vehicle comfort.Withtherapiddevelopmentof electric vehicles，this issue hasatracted increasingatention from theautomotive industry.Thisstudyconducts anexperimental investigationonthe low-frequencynoisecontribution inanew energy multi-purposevehicle （MPV）using theclasical transferpath analysis （TPA）method.Byintegrating modal analysis and operational deflection shape （ODS）analysis，the noise-contributing components along the transmision path are identified.For theidentifiedcomponents，structuraloptimization isperformedthrough simulation，including tailgatereinforcement and rigidity enhancement，aiming to increase modal frequencies and decouple problematic resonance frequencies.Theefectivenessof theoptimization isvalidated through vehicle testing.Testresults indicatethat the main contributing frequencies are 27Hz and 43Hz The 27Hz component arises from the X -direction rigid body mode of the rear suspension and the first-order rigid swing mode of the tailgate.After optimizing the tailgate structure， itsmodal frequency increased from 29.2Hz to 32.9Hz ，resulting in a 4 dB（A） noise reduction in the front row and 6.4 dB（A） in the rear row. The 43Hz component is mainly due to the first-order mode of the panoramic sunroof. By modifying itssurfacecurvature，themodal frequency decreased from 37.8Hz to 32.1Hz ，leading to noisereductions of7dB（A） inthe frontand3dB（A）in therear.The proposedoptimization strategies significantly improve interior noise performance and provide valuable references for low-frequency road noise control in vehicle design. Key words： low frequency road noise;transfer path analysis; operational deflection shapes;noise reduction

汽车振动噪声直接影响着整车舒适性和体验感。（剩余10282字）