某SUV车内加速噪声研究及改进
2018-12-08王小燕刘涛
王小燕 刘涛
摘 要:某SUV量产车型售后客户抱怨发动机转速3000~4000rpm时车内加速噪声大,通过主观评价及客观数据分析发现该转速段内存在轰鸣声。借助模态试验和仿真相结合的方法分析了轰鸣声的形成原因,识别了轰鸣声的主要传递路径,确认了副车架模态对车内轰鸣声的影响。通过采用在前挡板和纵梁连接处增加支架的优化方案,有效解决客户抱怨的车内加速噪声大的问题。
关键词:轰鸣声;模态试验;传递路径分析
中图分类号:U467.1 文献标识码:A 文章编号:1005-2550(2018)05-0095-04
Abstract: A SUV production models customers complained about the cabin acceleration noise when the engine speed at 3000~4000rpm, through subjective evaluation and objective data analysis found that there is a booming noise at the speed segment. With the help of the combination of modal test and simulation, the cause of booming noise was analyzed, the main transmission path of booming noise was identified, and the influence of sub-frame mode on the booming noise was verified. Two brackets were added between front bezel and stringer connection, through the program effectively solve the customer complaints of the car acceleration noise problem.
Key Words: booming noise; modal test; transfer path analysis
1 前言
随着乘用车迅速普及,消费者对车内舒适性的关注度及要求日益增高,尤其是容易明显感知的声学舒适性。加速是客户最常使用的工况之一,加速时车内噪声的线性度及柔和度是客户重点关注指标。轰鸣声是加速时车内噪声问题的主要表现之一,整车加速噪声的提升主要集中在改
善车内噪声的线性度,消除轰鸣声。传递路径分析、相关性分析、模态分析[1-2]等方法常被运用到轰鸣声的产生机理研究上,通过上述相关方法确定轰鸣声的振动激励来源。优化车内轰鸣声主要從传递路径入手,重点降噪方法有改变声腔模态和结构模态分布、改变传动轴的固有特性、安装扭转减振器、改变副车架结构、优化悬架等[3]。
某款小型SUV售后一季度市场调研显示,顾客最烦恼的问题共175个,其中声学舒适性问题占32%(车速稍快时,发动机噪音大/行驶时噪音偏大),而车内加速噪声大占声学舒适性问题的37.5%。……
