某SUV车内低频轰鸣声问题分析与优化

Analysis and optimization of low frequency roaring sound in a SUV

以某车型车内轰鸣声为例,分别从激励源、响应点和传递路径3个角度进行分析,得出轰鸣声由传动系统扭振激励,通过车身与尾门的连接,使激励频率与尾门内板呼吸模态强耦合.最终通过优化尾门与车身的连接,对尾门板件加槽钢,内外板间增加支撑螺栓,改善了车内低频轰鸣声.为快速解决汽车车内低频轰鸣声问题提供一种新思路.

To provide a new idea for quickly solving the problem of low-frequency roar in the car,this paper analyzes the excitation source,response point and transmission path with the roar of a certain vehicle as an example.It is concluded that the roar is excited by the torsional vibration of the transmission system,strong coupling of breathing modes in door inner panel.By optimizing the connection between the tail gate and the body,adding channel steel to the tail gate panels,adding support bolts between the inner and outer panels,the low-frequency roar in the car is improved.