某纯电动汽车路噪性能优化  

Optimization of Road Noise Performance for A Battery Electric Vehicle

作　　者：王维松[1] 李默华 靳豹[1] Wang Weisong;Li Mohua;Jin Bao(Baoding Technology R&D Branch of Great Wall Motor Company Limited,Baoding 071003)

机构地区：[1]长城汽车股份有限公司保定技术研发分公司,保定071000

出　　处：《汽车工程师》2023年第5期40-44,共5页Automotive Engineer

摘　　要：为解决某纯电动汽车行驶时传递到车内的路噪过大的问题,利用“源-路径-响应”的排查方法,对轮胎、后扭力梁、车身板件进行排查,识别出后扭力梁模态与路面激励耦合,对路噪起到了放大作用,通过虚拟验证对车身板件进行动态特性分析,识别出后侧围区域模态与声腔模态耦合,是整车车内路噪过大的主要原因。通过在侧围外板与C柱和D柱之间增加支撑结构,提升侧围外板局部刚度,由此优化后侧围区域的模态频率及振动幅值,对该方案进行车内路噪实车测试,结果表明,78~90 Hz、120 Hz、200~220 Hz频率区间车内噪声显著降低,主观评价车内路噪满足要求。In order to solve the problem of excessive road noise transmitted to the interior of battery electric vehicles in driving,this article investigated the tire,rear torsion beam and body panel by using the method of“source-path-response”,to identify the coupling between the mode of rear torsion beam and road excitation,which amplified road noise.By dynamical property analysis of body panel through virtual verification,it was identified that the coupling between the mode of rear side wall area and the mode of acoustic cavity was the main cause for excessive road noise in the vehicle.By adding a support struc⁃ture between the side wall outer plate and C-pillar and D-pillar,the local stiffness of the side wall outer plate was improved,so as to optimize the modal frequency and vibration amplitude in the rear side wall area.The vehicle interior road noise test was carried out.The results show that vehicle interior noise is reduced obviously in the frequency ranges of 78~90 Hz,120 Hz and 200~220 Hz,and its subjective evaluation of interior road noise meets the requirements.

关 键 词：纯电动汽车 路噪 轮胎 后扭力梁 车身板件 

分 类 号：U467[机械工程—车辆工程]