自动挡车型Creep Groan噪声传递路径分析与优化  

Analysis and Optimization of Creep Groan Noise Transfer Path for AT Vehicles

作　　者：徐宜敏[1] 段龙杨 翁建生[2] 吴赵生[1] 王轮[1] XU Yi-min;DUAN Long-yang;WENG Jian-sheng;WU Zhao-sheng;WANG Lun(Jiangling Auto Co. Ltd., Jiangxi Vehicle Noise and Vibration Key Lab.,Nanchang 330001, China;School of Energy and Power Engineerine, Nanjing University of Aeronautics and Astronautics Nanjing 210016, China)

机构地区：[1]江铃汽车股份有限公司江西省汽车噪声与振动重点实验室,南昌330001 [2]南京航空航天大学能源与动力工程学院,南京210016

出　　处：《噪声与振动控制》2017年第5期124-127,203,共5页Noise and Vibration Control

基　　金：江西省教育厅科学技术研究资助项目(GJJ151157)

摘　　要：Creep Groan(吱嘎声)噪声是一种频率小于1 000 Hz的低频噪声,当自动挡车型采用D挡、R挡慢慢松开刹车起步或低速轻踩刹车慢慢停止时都容易产生该噪声。以前Creep Groan噪声主要通过修改摩擦片的摩擦材料进行优化,很少通过分析和改进Creep Groan噪声传递路径进行优化。主要通过相干性、ODS、NTF分析,确定Creep Groan噪声主要传递路径为车辆前悬挂系统,关键节点为车辆前悬挂系统中减震器的Top mount。通过降低Top mount硬度使Creep Groan噪声改善明显,达到可接受主观驾评。Creep groan noise is a kind of low frequency noises with the frequency below1000Hz,which will be generated very easily when the driver of an automatic car is releasing the brake slowly to start with D block or R block,or giving the brake slowly to stop.Recently,most of the creep groan noise is eliminated by changing the friction material of brake shoes.Nevertheless,it is rare to find the work of reducing the creep groan noise by analyzing and improving the transfer path of the noise.In this paper,through the coherence,ODS and NTF analyses,it is found that the main transfer path of the creep groan noise is in the front suspension system of the vehicle.And the key component is the top mount of the shock absorber of the front suspension system.By lowering the hardness of the top mount,the creep groan noise is reduced obviously and the subjective driving assessment is acceptable.

关 键 词：声学 CreepGroan噪声 ODS 相干性 Topmount NTF 减震器 

分 类 号：TB535.1[理学—物理] U467.49[理学—声学]