摘 要：针对某新能源轻型卡车制动过程出现的驾驶室抖动问题，采用整车源-路径测试排查方法进行分析，结果表明，抖动根源为鼓式制动器的径向跳动与圆柱度超差。在制动减速至70 km/h与60km/h时，该问题激发出轮胎的14 Hz与18 Hz二阶激励，该激励进一步与框式车架模态耦合，振动经结构路径传递至驾驶室，引起地板明显抖动。基于上述机理，综合实施制动鼓精度控制、车架模态优化及驾驶室悬置隔振改进，经实车验证后该轻型卡车驾驶室制动抖动问题得到有效解决。
关键词：制动抖动；圆柱度；径向跳动；车架模态；制动压力波动
中图分类号：U467.1；U463.5 文献标志码：A DOI：10.15917/j.cnki.1006-3331.2025.06.010
Analysis and Optimization of Braking Shake Test for New Energy Light Truck Cab
HUANG Yi,QIN Zonggeng,LIU Chaomin,NIU Yunpeng,XIA Xiaojun,YE Lei
Abstract: This study investigates a cabin vibration issue during braking in a new energy light truck using a source-path testing approach.The results indicate that the root cause is excessive radial runout and cylindricity deviation in the drum brakes.During deceleration to 70km/h and 60km/h,this irregularity excites second-order tire vibrations at 14 Hz and 18 Hz,respectively.These vibrations then couple with the modal frequency of the frame-style chassis.The coupled vibration transmits though structural paths to the cabin,inducing significant floor shaking.Based on this mechanism,this study implements an integrated solution that incorporates precision control of the brake drum,optimizes the chassis modal characteristics,and improves the vibration isolation of the cab mounts.After through vehicle verification,the issue of brake vibration in the light truck cab has been effectively resolved.
Key words: bake judder; cylindricity; radial runout; chassis mode; brake pressure variation
